EP0395539A1 - Process for obtaining a high-gloss base and the base so produced - Google Patents

Process for obtaining a high-gloss base and the base so produced Download PDF

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Publication number
EP0395539A1
EP0395539A1 EP90420175A EP90420175A EP0395539A1 EP 0395539 A1 EP0395539 A1 EP 0395539A1 EP 90420175 A EP90420175 A EP 90420175A EP 90420175 A EP90420175 A EP 90420175A EP 0395539 A1 EP0395539 A1 EP 0395539A1
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EP
European Patent Office
Prior art keywords
gloss
pigments
weight
layer
traditional
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90420175A
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German (de)
French (fr)
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EP0395539B1 (en
Inventor
Claude Maubert
Henri Vallet
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Aussedat Rey SA
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Aussedat Rey SA
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D21H19/822—Paper comprising more than one coating superposed two superposed coatings, both being pigmented
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52—Additives of definite length or shape
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/259—Silicic material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/3188—Next to cellulosic
    • Y10T428/31895—Paper or wood
    • Y10T428/31906—Ester, halide or nitrile of addition polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31971—Of carbohydrate
    • Y10T428/31993—Of paper
    • Y10T428/31996—Next to layer of metal salt [e.g., plasterboard, etc.]

Definitions

  • the present invention relates to the technical field of stationery and it relates, more particularly, to the production of special papers comprising, on at least one side, a coating intended to give them particular characteristics.
  • the invention relates, more particularly, among these so-called special papers, those having a high gloss character and intended to be used for printing, in particular in the advertising field.
  • the current trend is to be able to have so-called high-gloss papers, in the sense that they have, on at least one side, a gloss at least equal, or even, preferably, greater than 85%.
  • the first known under the name of coating on chrome or "cast coating", consists of scrolling the paper strip to be treated on a chrome cylinder, perfectly polished and heated which it partially surrounds, after having been taken care of by two deflection rollers.
  • the paper strip is coated, on its internal face, in particular by injection, with a coating layer or sauce including, in addition to traditional pigments, special binders and adjuvants intended to preserve to the layer a certain malleability during its contact with the chromed cylinder and to facilitate the separation between this last and the layer.
  • a coating layer or sauce including, in addition to traditional pigments, special binders and adjuvants intended to preserve to the layer a certain malleability during its contact with the chromed cylinder and to facilitate the separation between this last and the layer.
  • the spread sauce is distributed, pressed and heated, between the paper and the chrome cylinder, so as to undergo, simultaneously with its spreading, a kind of calendering and simultaneous drying.
  • Suitable results can be obtained with running speeds between 0 and 50 or 100 m / min. This requirement for a limited running speed corresponds to the need to have, beyond the cylinder, a paper which is sufficiently dry for it to be able to be peeled off from the chrome-plated cylinder.
  • Such a technique is further penalized by the difficulty of being able to produce a high-gloss paper on two sides. Indeed, during the coating of the second face, the evacuated vapor must, necessarily, pass through the paper and the layer of the first coated face. This vapor, during its evacuation, deteriorates the layer of the first face and does not make it possible to obtain a suitable second face, due to the braking imposed on the evacuation of the vapor by the need to pass through the paper and the first layer filed.
  • Such a technique is, moreover, also known for not allowing the coating, under suitable conditions, of a support other than paper and, more particularly, of a support made of plastic, due to the non-permeability of such a material.
  • a second technique consists in depositing, by traditional coating, with a trailing blade for example, a sauce on one face of a support by composing the coating sauce so as to include in it a suitable proportion of plastic pigments also called gloss pigments in following this memo and made up of spherical particles whose average diameter is between 0.05 and 1 micrometer and, preferably, close to 0.5 micrometer.
  • the coating takes place over a sufficient thickness, generally between 3 and 25 micrometers, so as to be able to have a resistant layer capable of being suitably calendered.
  • the first is due to the very high cost that should be agreed for the composition of the coating sauce, because of the high price of the plastic pigments to be incorporated.
  • the layer containing a high proportion of plastic pigments generally greater than 30% by weight, if it compacts very easily during calendering, suffers a loss of opacity which is harmful in itself but which results in moreover, by a defect in surface appearance, analogous to the defect in appearance commonly called sealing in the paper industry.
  • sealing corresponds to the appearance of a more or less heterogeneous gray tint which comes from a sort of vitrification of the paper.
  • Such a drawback is unacceptable for the production of high-gloss white or pastel-colored papers, but also of dark shades.
  • the object of the present invention is precisely to overcome this difficulty by proposing a new process for obtaining a high-gloss support, such a support being able to be a paper but also, indifferently, a substrate, such as a strip or a plastic film.
  • the method of the invention also makes it possible, if necessary, to treat the two faces of the same substrate, using the same operating phases, possibly offset in time, if a method is considered processing by continuous scrolling.
  • the subject of the invention is also, as a new industrial product, a high-gloss support, with a gloss at least equal to 80 or 85%, characterized by the existence of a substrate comprising, on at least one face: - a first layer of a traditional coating sauce deposited at a rate of 3 to 25 g / m2, - at least one superimposed layer, called the upper layer, formed of a sauce deposited at a rate of 1 to 10 g / m2 and based on traditional pigments with a particle size of at least 60% less than 2 micrometers, of at least one binder traditional in sufficient quantity and gloss pigments at a rate of at least 20% by weight of the charge of traditional pigments and corresponding to a particle size between 0.05 and 1 micrometer and, preferably, close to 0.5 micrometer.
  • the process for obtaining a high-gloss support according to the invention consists in using a substrate in sheet, film, plate, of relatively thin thickness, generally close to 100 micrometers.
  • a substrate is described, preferably in the following, as being a paper of traditional manufacturing, for example with a grammage of 80 g / m2 having possibly undergone a size press treatment during its manufacture.
  • the invention applies, under exactly the same conditions, to any substrate of different material and, in particular, to a polyester film.
  • the first operational phase of the process consists in depositing, on at least one of the faces of the substrate, a coating sauce, of traditional composition in stationery, at a rate of 3 to 25 g / m2 , more particularly from 8 to 15 g / m2 and, preferably, around 10 g / m2.
  • the coated sauce is said to be traditional by its composition, pigments, binders and additives conventionally used.
  • a reservation must be made in the sense of the term "traditional", because of the desire to choose, in all cases, a composition that must meet different imperatives to assume the functions assigned to it.
  • attachment support by constituting a prelayer for subsequent layers, that of being as white as possible, that of being of low cost and that of having the ability filling in surface differences, usually presented by paper.
  • the coating sauce comprises conventional pigments including, preferably, kaolin, pigments corresponding, for at least 60% of them, to a particle size less than 2 micrometers.
  • the pigments chosen have, for at least 90% of them, a particle size of less than 2 micrometers.
  • composition of the coating sauce also comprises, in a traditional manner, suitable binders so that the layer assumes the above functions, binders among which mention should be made of synthetic latexes, starch, polyvinyl alcohol, proteins.
  • the coating sauce is free of gloss pigments.
  • This sauce is deposited to form a precoat regularly covering, in a homogeneous and uniform manner, the support face.
  • This precoat is deposited, by any suitable means known in the art, for example with a trailing blade.
  • the precoat undergoes a natural or forced drying phase, followed, if necessary, by a calendering phase carried out using traditional stationery means but, preferably, at a higher temperature than room temperature to facilitate subsequent production. of shine.
  • This temperature can be between ambient and 150 o C, for example between 80 and 100 o C.
  • Calendering can be carried out with a pressure of 0 to 300 kg per linear centimeter.
  • the method according to this first implementation provides for the deposition of at least one so-called gloss layer, at a rate of 1 to 10 g / m2, preferably at a rate of 3 g / m2.
  • the gloss layer is formed from a coating sauce based on traditional pigments, of the type described in relation to the previous precoat.
  • the constituent sauce of the so-called gloss layer incorporates, however, gloss pigments at a rate of at least 20% by weight of the charge of traditional pigments incorporated in this gloss layer.
  • the gloss pigments are chosen to have a particle size between 0.05 and 1 micrometer and, preferably, close to 0.5 micrometer.
  • acrylic styrene copolymers such as, in particular, the product sold under the brand name "Ropaque” by the company ROHM and HAAS or, again, polystyrenes, such as products marketed under the brand name "NYTRON” by the company WILLIAMS.
  • the sauce of the gloss layer from traditional pigments of which at least 60% of them, and preferably 90% of them, have a particle size of less than 2 micrometers.
  • the gloss layer is deposited by traditional coating method, also preferably with a dragging blade, then undergoes traditional or forced drying followed by conventional calendering at usual temperature. This temperature is preferably as high as possible to improve the gloss, but it should not exceed 105 o C, in order to avoid adhesion of the layer on the rollers of the calender. Calendering is carried out at conventional pressures, for example of the order of 100 to 300 kg per linear centimeter.
  • the constitution of an overall layer by proceeding as said above, by depositing a precoat followed by at least one gloss layer, makes it possible to obtain, from a substrate of the type of that specified above, a brightness characteristic close to 85%. This characteristic is obtained without the effect of graying or sealing, by globally involving only a small proportion of plastic pigments of gloss deemed to be of a high cost price.
  • Results are obtained by depositing, on the precoat of the type described above, two superimposed layers, called gloss, of similar composition and deposited by coating under the same conditions. In such a case, it is possible to lower the proportion of gloss pigments in each of the layers, while obtaining the desired result. Adequate results have been obtained by providing 15% of gloss pigments for the first superimposed layer and 20% for the second so-called upper layer.
  • the gloss layer from 30% by weight of gloss pigments, from 20% by weight of kaolin, of which 98% at least preferably corresponds to a particle size of 2 micrometers, and of pigments and traditional binders in sufficient additional quantity.
  • the pre-layer does not contain kaolin
  • a first layer is deposited on the substrate intended to assume the function of prelayer and the function of first gloss layer.
  • a layer of traditional composition including a proportion of less than 15% by weight is deposited on the substrate, at a rate of 5 to 20 g / m2 and, preferably, 10 g / m2, according to usual conditions.
  • gloss pigments and then, after drying and possible calendering, at a rate of approximately 4 g / m2, a second layer including 20% gloss pigments. This second layer is dried and calendered and the substrate thus treated is characterized by a gloss close to 87%.
  • a standard paper support consisting, for example, of 50% of long softwood fibers and of 50% of short hardwood fibers and coated with starch in size press during its manufacture and characterized by the following tests: - Weight ; 66.5 g / m2 - Air porosity AFNOR Q 03075 , 2.3 - Cobb bonding (1 min) (side 1 / side 2) AFNOR Q 03014 whi 20/18 - Smooth Bekk (side 1 / side 2) AFNOR Q 03012 7-8 19/21 - Hunterlab sheen (side 1 / side 2) TAPPI T 480 ; 5/5 - CIE Whiteness (side 1 / side 2) GANZ and BRIESSER method 8.1 128/122
  • Step 1
  • this support was coated on side 1 with a dragging coater with the following coating sauce: - 60 parts by weight (dry / dry) of ground natural calcium carbonate Hydrocarb 90 manufactured by the company OMYA and characterized by a particle size of 90% ⁇ 2 micrometers, - 40 parts by weight (dry / dry) of kaolin HT marketed by the company ENGELHARD, - 10 parts by weight of synthetic latex DL 670 of the DOW CHEMICAL FRANCE, - 0.3 parts by weight (dry / dry) of carboxymethylcellulose of medium viscosity 7 M1 from the company HERCULES, - the necessary amount of water to obtain a preparation with a 65% solids content, - the quantity of ammonia necessary to obtain a pH of 9.5.
  • coating sauce - 60 parts by weight (dry / dry) of ground natural calcium carbonate Hydrocarb 90 manufactured by the company OMYA and characterized by a particle size of 90% ⁇ 2 micrometers, - 40 parts by weight (dry
  • the layer weight deposited was 12 g / m2 on side 1.
  • This paper was coated a second time on the same side 1, with a dragging blade, with a coating formulation of the following composition: - 30 parts by weight (dry / dry) of Ropaque OP 84 synthetic organic pigment from the company ROHM and HAAS, - 70 parts by weight (dry / dry) of fine kaolin (98% ⁇ 2 micrometers) Amazon 88 sold by the company EUROCLAY, - 16 parts by weight (dry / dry) of synthetic latex Acronal 360 D from the company BASF, - 0.5 part by weight (dry / dry) of carboxymethylcellulose 7 M1 from the company HERCULES, - the quantity of water necessary to obtain a preparation with a solids content of 51%, - the necessary amount of ammonia to obtain a pH of 9.5.
  • the layer weight deposited was 4.5 g / m2.
  • This paper was then calendered under the conditions usually used to obtain ordinary glossy papers (glosses of the order of 65%).
  • the paper obtained had the following characteristics - Weight ; 83 g / m2 - Smooth Bekk (side 1) AFNOR Q 0312 ; 1,350 - Hunterlab sheen (side 1) TAPPI T 480 ; 87.5 - CIE Whiteness (face 1) GANZ and BRIESSER method ; 96 - No sealing.
  • step 2 the following coating formulation was used: - 50 parts by weight (dry / dry) of Ropaque OP 84 synthetic organic pigment from the company ROHM and HAAS, - 50 parts by weight (dry / dry) of fine kaolin (98% ⁇ 2 micrometers) Amazon 88 sold by the company EUROCLAY, - 16 parts by weight (dry / dry) of synthetic latex Acronal 360 D from the company BASF, - 0.5 part by weight (dry / dry) of carboxymethylcellulose 7 M1 from the company HERCULES, - the quantity of water necessary to obtain a preparation with a solids content of 51%, - the necessary amount of ammonia to obtain a pH of 9.5.
  • the layer weight deposited was 4.5 g / m2.
  • the paper obtained had the following characteristics: - Weight ; 83 g / m2 - Smooth Bekk (side 1) AFNOR Q 03012 , 1,370 - Hunterlab sheen (side 1) TAPPI T 480 ; 92 - CIE Whiteness (face 1) GANZ and BRIESSER method ; 97 - No sealing.
  • Example 3 The paper of Example 3 was made from the same support and with the same first step as that of Examples 1 and 2.
  • the paper was coated a second time on the same side 1, with a dragging blade, with a coating formulation of the following composition: - 20 parts by weight (dry / dry) of Ropaque OP 84 synthetic organic pigment from the company ROHM and HAAS, - 80 parts by weight (dry / dry) of fine kaolin (98% ⁇ 2 micrometers) Amazon 88 sold by the company EUROCLAY, - 16 parts by weight (dry / dry) of synthetic latex Acronal 360 D from the company BASF, - 0.5 part by weight (dry / dry) of carboxymethylcellulose 7 M1 from the company HERCULES, - the quantity of water necessary to obtain a preparation with a solids content of 51%, - the necessary amount of ammonia to obtain a pH of 9.5.
  • the layer weight deposited was 3 g / m2.
  • This paper was coated a third time on the same side and with the same formulation as in step 2.
  • the layer weight deposited was 2.5 g / m2.
  • the paper obtained had the following characteristics: - Weight dozens 84 g / m2 - Smooth Bekk (side 1) AFNOR Q 03012 , 1,450 - Hunterlab sheen (side 1) TAPPI T 480 ; 86.5 - CIE Whiteness (face 1) GANZ and BRIESSER method 7-8 95 - No sealing.
  • Step 1
  • this support was coated on side 1 with a "Gate roll” coater with the following coating sauce: - 100 parts by weight (dry / dry) of ground natural calcium carbonate Hydrocarb 90 manufactured by the company OMYA and characterized by a particle size of 90% ⁇ 2 micrometers, - 30 parts by weight (dry / dry) of starch previously cooked under standard conditions, - 0.4 parts by weight (dry / dry) of Leucophor CK optical brightener from the company SANDOZ, - the necessary amount of water to obtain a preparation with a 53.5% solids content.
  • a "Gate roll” coater with the following coating sauce: - 100 parts by weight (dry / dry) of ground natural calcium carbonate Hydrocarb 90 manufactured by the company OMYA and characterized by a particle size of 90% ⁇ 2 micrometers, - 30 parts by weight (dry / dry) of starch previously cooked under standard conditions, - 0.4 parts by weight (dry / dry) of Leucophor CK optical brightener from the
  • the layer weight deposited was 9 g / m2 on side 1.
  • This paper was coated a second time on the same side 1, with a dragging blade, with a coating formulation of the following composition: - 50 parts by weight (dry / dry) of synthetic organic pigment Ropaque OP 84 from The Company ROHM and HAAS, - 50 parts by weight (dry / dry) of kaolin HT marketed by the ENGELHARD Company , - 16 parts by weight (dry / dry) of Baysthal P 1 700 synthetic latex from the company Bayer, - 0.7 parts by weight (dry / dry) of carboxymethylcellulose 7 L2C from the company Hercules, - 0.85 parts by weight (dry / dry) of Leucophor CK optical brightener from the company SANDOZ, - the quantity of water necessary to obtain a preparation with a solids content of 51%, - the necessary amount of ammonia to obtain a pH of 9.5.
  • the layer weight deposited was 4.5 g / m2.
  • the paper was calendered under the same conditions as for Examples 1, 2 and 3.
  • the paper obtained had the following characteristics: - Weight dozens 64 g / m2 - Smooth Bekk (side 1) AFNOR Q 03012 (2017) 1,370 - Hunterlab sheen (side 1) TAPPI T 480 ?? 81 - CIE Whiteness (face 1) GANZ and BRIESSER method ?? 88 - No sealing.
  • Step 1
  • this support was coated on side 1 with a dragging coater with the following coating sauce: - 50 parts by weight (dry / dry) of ground natural calcium carbonate Hydrocarb 90 manufactured by the company OMYA and characterized by a particle size of 90% ⁇ 2 micrometers, - 40 parts by weight (dry / dry) of kaolin HT marketed by the company ENGELHARD, - 10 parts by weight (dry / dry) of Ropaque OP 84 synthetic organic pigment from the company ROHM and HASS, - 10 parts by weight of synthetic latex DL 670 from the company DOW CHEMICAL FRANCE, - 0.3 parts by weight (dry / dry) of carboxymethylcellulose of medium viscosity 7 M1 from the company HERCULES, - the necessary amount of water to obtain a preparation for 65% solids content, - the quantity of ammonia necessary to obtain a pH of 9.5.
  • the layer weight deposited was 12 g / m2 on side 1.
  • This paper was coated a second time on the same side 1, with a dragging blade with a coating formulation of the following composition: - 20 parts by weight (dry / dry) of Ropaque OP 84 synthetic organic pigment from the company ROHM and HAAS, - 80 parts by weight (dry / dry) of fine kaolin (98% ⁇ 2 micrometers) Amazon 88 sold by the company EUROCLAY, - 16 parts by weight (dry / dry of Acronal 360 D synthetic latex from BASF, - 0.5 part by weight (dry / dry) of carboxymethylcellulose 7 M1 from the company HERCULES, - the quantity of water necessary to obtain a preparation with a solids content of 51%, - the necessary amount of ammonia to obtain a pH of 9.5.
  • the layer weight deposited was 4.5 g / m2.
  • This coated paper was then calendered under the conditions usually used to obtain ordinary glossy papers (glosses of the order of 65%).
  • the paper obtained had the following characteristics: - Weight ; 83 g / m2 - Smooth Bekk (side 1) AFNOR Q 03012 , 1,750 - Hunterlab sheen (side 1) TAPPI T 480 ; 87 - CIE Whiteness (face 1) GANZ and BRIESSER method 7-8 97 - No sealing.

Abstract

- Papermaking. <??>- The base comprises, on at least one face: - a first coat of a conventional coating slip deposited at a rate of 3 to 25 g/m<2>, - at least one superposed coat deposited at a rate of 1 to 10 g/m<2> and based on conventional pigments, at least one conventional binder and gloss pigments in a proportion of at least 20 % of parts by weight of the traditional pigment charge and corresponding to a particle size of between 0.05 and 1 micrometre and, preferably, close to 0.5 micrometre. <??>- Application to the production of a high-gloss paper.

Description

La présente invention concerne le domaine technique de la papeterie et elle vise, plus particulièrement, la production de papiers spéciaux comportant, sur une face au moins, un revêtement destiné à leur conférer des caractéristiques particulières.The present invention relates to the technical field of stationery and it relates, more particularly, to the production of special papers comprising, on at least one side, a coating intended to give them particular characteristics.

L'invention vise, plus particulièrement, parmi ces papiers dits spéciaux, ceux présentant un caractère de haute brillance et destinés à être utilisés pour l'impression, notamment dans le domaine publicitaire.The invention relates, more particularly, among these so-called special papers, those having a high gloss character and intended to be used for printing, in particular in the advertising field.

La tendance actuelle est de pouvoir disposer de papiers, dits hauts brillants, en ce sens qu'ils possèdent, sur au moins une face, une brillance au moins égale, voire, de préférence, supérieure à 85 %.The current trend is to be able to have so-called high-gloss papers, in the sense that they have, on at least one side, a gloss at least equal, or even, preferably, greater than 85%.

Pour tenter d'obtenir de tels papiers, au moins deux techniques de préparation sont connues.In an attempt to obtain such papers, at least two preparation techniques are known.

La première, connue sous le nom de couchage sur chrome ou "cast coating", consiste à faire défiler la bande de papier devant être traitée sur un cylindre chromé, parfaitement poli et chauffé qu'elle entoure partiellement, après avoir été prise en charge par deux rouleaux de renvoi.The first, known under the name of coating on chrome or "cast coating", consists of scrolling the paper strip to be treated on a chrome cylinder, perfectly polished and heated which it partially surrounds, after having been taken care of by two deflection rollers.

Juste avant son enveloppement sur le cylindre chromé et chauffé, la bande de papier est enduite, sur sa face interne, notamment par injection, d'une couche ou sauce de couchage incluant, outre des pigments traditionnels, des liants et adjuvants spéciaux destinés à conserver à la couche une certaine malléabilité pendant son contact avec le cylindre chromé et à faciliter le décollement entre ce dernier et la couche.Just before its wrapping on the chromed and heated cylinder, the paper strip is coated, on its internal face, in particular by injection, with a coating layer or sauce including, in addition to traditional pigments, special binders and adjuvants intended to preserve to the layer a certain malleability during its contact with the chromed cylinder and to facilitate the separation between this last and the layer.

La sauce étalée est répartie, pressée et chauffée, entre le papier et le cylindre chromé, de manière à subir, simultanément à son étalement, une sorte de calandrage et de séchage simultanés.The spread sauce is distributed, pressed and heated, between the paper and the chrome cylinder, so as to undergo, simultaneously with its spreading, a kind of calendering and simultaneous drying.

Des résultats convenables peuvent être obtenus avec des vitesses de défilement comprises entre 0 et 50 ou 100 m/mn. Cette exigence de vitesse de défilement limitée correspond à la nécessité de disposer, au-delà du cylindre, d'un papier suffisamment sec pour qu'il puisse être décollé du cylindre chromé.Suitable results can be obtained with running speeds between 0 and 50 or 100 m / min. This requirement for a limited running speed corresponds to the need to have, beyond the cylinder, a paper which is sufficiently dry for it to be able to be peeled off from the chrome-plated cylinder.

Une telle technique est donc pénalisée par une vitesse de production faible exigeant, de surcroît, une installation particulière pour assurer l'enroulement de la bande de papier, le chauffage permanent du cylindre chromé de fabrication onéreuse et l'injection de la sauce de couchage.Such a technique is therefore penalized by a low production speed requiring, in addition, a special installation to ensure the winding of the paper strip, the permanent heating of the chromium cylinder of expensive manufacture and the injection of the coating sauce.

Une telle technique est, par ailleurs, pénalisée encore par la difficulté de pouvoir réaliser un papier haut brillant sur deux faces. En effet, lors du couchage de la seconde face, la vapeur évacuée doit, nécessairement, traverser le papier et la couche de la première face couchée. Cette vapeur, lors de son évacuation, détériore la couche de la première face et ne permet pas d'obtenir une seconde face convenable, en raison du freinage imposé à l'évacuation de la vapeur par la nécessité de traverser le papier et la première couche déposée.Such a technique is further penalized by the difficulty of being able to produce a high-gloss paper on two sides. Indeed, during the coating of the second face, the evacuated vapor must, necessarily, pass through the paper and the layer of the first coated face. This vapor, during its evacuation, deteriorates the layer of the first face and does not make it possible to obtain a suitable second face, due to the braking imposed on the evacuation of the vapor by the need to pass through the paper and the first layer filed.

Une telle technique est, par ailleurs, connue également pour ne pas permettre le couchage dans des conditions convenables d'un support autre qu'un papier et, plus particulièrement, d'un support en matière plastique, en raison de la non perméabilité d'une telle matière.Such a technique is, moreover, also known for not allowing the coating, under suitable conditions, of a support other than paper and, more particularly, of a support made of plastic, due to the non-permeability of such a material.

Une seconde technique consiste à déposer, par couchage traditionnel, à la lame traînante par exemple, une sauce sur une face d'un support en composant la sauce de couchage de manière à lui inclure une proportion convenable de pigments plastiques appelés également pigments de brillance dans la suite de ce mémoire et constitués de particules sphériques dont le diamètre moyen est compris entre 0,05 et 1 micromètre et, de préférence, voisin de 0,5 micromètre.A second technique consists in depositing, by traditional coating, with a trailing blade for example, a sauce on one face of a support by composing the coating sauce so as to include in it a suitable proportion of plastic pigments also called gloss pigments in following this memo and made up of spherical particles whose average diameter is between 0.05 and 1 micrometer and, preferably, close to 0.5 micrometer.

Dans une telle technique, le couchage s'effectue sur une épaisseur suffisante, généralement comprise entre 3 et 25 micromètres, de manière à pouvoir disposer d'une couche résistante susceptible d'être convenablement calandrée.In such a technique, the coating takes place over a sufficient thickness, generally between 3 and 25 micrometers, so as to be able to have a resistant layer capable of being suitably calendered.

Après calandrage et en raison de la dispersion des pigments de brillance dans l'épaisseur de la couche, on constate l'obtention d'une caractéristique de brillance, certes manifeste, mais n'atteignant pas les 80 % ou 85 % recherchés, même avec des teneurs en pigments de brillance aussi élevées que 30 % de parties en poids des pigments traditionnels entrant dans la composition de la sauce de couchage.After calendering and due to the dispersion of the gloss pigments in the thickness of the layer, it is observed that a gloss characteristic is obtained, which is certainly manifest, but does not reach the 80% or 85% sought, even with of levels of gloss pigments as high as 30% by weight of the traditional pigments used in the composition of the coating sauce.

On pourrait penser que pour atteindre cette caractéristique il suffit d'augmenter, dans les proportions nécessaires, la charge de pigments plastiques incorporée à la sauce de couchage. Une telle démarche intellectuelle, si elle peut paraître évidente initialement, n'est en fait pratiquement pas envisageable pour deux raisons.One might think that to achieve this characteristic it suffices to increase, in the necessary proportions, the load of plastic pigments incorporated in the coating sauce. Such an intellectual approach, if it may seem obvious initially, is in fact practically not possible for two reasons.

La première tient au coût très élevé qu'il conviendrait de consentir pour la composition de la sauce de couchage, en raison du prix élevé des pigments plastiques devant être incorporés.The first is due to the very high cost that should be agreed for the composition of the coating sauce, because of the high price of the plastic pigments to be incorporated.

La seconde est, qu'en procédant de la sorte, on constate, lors du calandrage, un effet secondaire et inattendu très néfaste. En effet, la couche contenant une forte proportion de pigments plastiques, généralement supérieure à 30 % de parties en poids, si elle se compacte très facilement lors du calandrage, subit une perte d'opacité néfaste en elle-même mais qui se traduit, de surcroît, par un défaut d'aspect en surface, analogue au défaut d'aspect communément appelé plombage dans l'industrie du papier. Un tel plombage correspond à l'apparition d'une teinte grise, plus ou moins hétérogène qui provient d'une sorte de vitrification du papier. Un tel inconvénient est rédhibitoire pour la production de papiers hauts brillants de couleur blanche ou pastel, mais aussi de teintes foncées.The second is that by proceeding in this way, we notice, during calendering, a very harmful side effect and unexpected. Indeed, the layer containing a high proportion of plastic pigments, generally greater than 30% by weight, if it compacts very easily during calendering, suffers a loss of opacity which is harmful in itself but which results in moreover, by a defect in surface appearance, analogous to the defect in appearance commonly called sealing in the paper industry. Such sealing corresponds to the appearance of a more or less heterogeneous gray tint which comes from a sort of vitrification of the paper. Such a drawback is unacceptable for the production of high-gloss white or pastel-colored papers, but also of dark shades.

Au total donc, les techniques actuelles ne permettent pas d'obtenir un papier ou un support haut brillant au sens où il se caractérise par une brillance au moins égale à 80 ou 85 % et, surtout, ne fournissent aucun enseignement permettant de conduire l'homme de métier sur une voie à même de combler cette lacune et de résoudre le problème ainsi posé.All in all, therefore, current techniques do not make it possible to obtain a paper or a high-gloss support in the sense that it is characterized by a gloss at least equal to 80 or 85% and, above all, do not provide any teaching making it possible to conduct the Tradesman on a path capable of filling this gap and solving the problem thus posed.

La présente invention a justement pour objet de surmonter cette difficulté en proposant un nouveau procédé pour l'obtention d'un support haut brillant, un tel support pouvant être un papier mais aussi, indifféremment, un substrat, tel qu'une bande ou un film de matière plastique.The object of the present invention is precisely to overcome this difficulty by proposing a new process for obtaining a high-gloss support, such a support being able to be a paper but also, indifferently, a substrate, such as a strip or a plastic film.

Le procédé de l'invention permet, également, de réaliser, en cas de besoin, le traitement des deux faces d'un même substrat, en faisant intervenir les mêmes phases opératoires, éventuellement décalées dans le temps, si l'on considère un procédé de traitement par défilement en continu.The method of the invention also makes it possible, if necessary, to treat the two faces of the same substrate, using the same operating phases, possibly offset in time, if a method is considered processing by continuous scrolling.

Pour atteindre les objectifs ci-dessus et d'autres qui découlent du mémoire qui suit, le procédé de l'invention est caractérisé par la mise en oeuvre des phases opératoires successives définies dans la revendication 1.To achieve the above objectives and others which follow from the thesis which follows, the method of the invention is characterized by the implementation of the successive operating phases defined in claim 1.

L'invention a également pour objet, à titre de produit industriel nouveau un support haut brillant, d'une brillance au moins égale à 80 ou 85 %, se caractérisant par l'existence d'un substrat comprenant, sur au moins une face :
- une première couche d'une sauce de couchage traditionnelle déposée à raison de 3 à 25 g/m²,
- au moins une couche superposée, dite supérieure, formée d'une sauce déposée à raison de 1 à 10 g/m² et à base de pigments traditionnels de granulométrie d'au moins 60 % inférieure à 2 micromètres, d'au moins un liant traditionnel en quantité suffisante et de pigments de brillance à raison d'au moins 20 % de parties en poids de la charge de pigments traditionnels et répondant à une granulométrie comprise entre 0,05 et 1 micromètre et, de préférence, voisine de 0,5 micromètre.The subject of the invention is also, as a new industrial product, a high-gloss support, with a gloss at least equal to 80 or 85%, characterized by the existence of a substrate comprising, on at least one face:
- a first layer of a traditional coating sauce deposited at a rate of 3 to 25 g / m²,
- at least one superimposed layer, called the upper layer, formed of a sauce deposited at a rate of 1 to 10 g / m² and based on traditional pigments with a particle size of at least 60% less than 2 micrometers, of at least one binder traditional in sufficient quantity and gloss pigments at a rate of at least 20% by weight of the charge of traditional pigments and corresponding to a particle size between 0.05 and 1 micrometer and, preferably, close to 0.5 micrometer.

Diverses autres caractéristiques ressortent de la description faite ci-dessous qui montre, à titre d'exemples non limitatifs, des formes de réalisation de l'objet de l'invention.Various other characteristics will emerge from the description given below which shows, by way of nonlimiting examples, embodiments of the subject of the invention.

Le procédé d'obtention d'un support haut brillant conforme à l'invention consiste à utiliser un substrat en feuille, en film, en plaque, de relativement faible épaisseur, généralement voisine de 100 micromètres. Un tel substrat est décrit, préférentiellement dans ce qui suit, comme étant un papier de fabrication traditionnelle, par exemple d'un grammage de 80 g/m² ayant, éventuellement, subi un traitement en presse d'encollage (size press) lors de sa fabrication. Cependant, l'invention s'applique, exactement dans les mêmes conditions, à tout substrat de matière différente et, notamment, à un film de polyester.The process for obtaining a high-gloss support according to the invention consists in using a substrate in sheet, film, plate, of relatively thin thickness, generally close to 100 micrometers. Such a substrate is described, preferably in the following, as being a paper of traditional manufacturing, for example with a grammage of 80 g / m² having possibly undergone a size press treatment during its manufacture. However, the invention applies, under exactly the same conditions, to any substrate of different material and, in particular, to a polyester film.

Dans un premier exemple de mise en oeuvre, la première phase opératoire du procédé consiste à déposer, sur l'une des faces au moins du substrat, une sauce de couchage, de composition traditionnelle en papeterie, à raison de 3 à 25 g/m², plus particulièrement de 8 à 15 g/m² et, préférentiellement, voisine de 10 g/m². La sauce couchée est dite traditionnelle par sa composition, ses pigments, les liants et les additifs conventionnellement utilisés. Une réserve doit être apportée au sens du terme "traditionnelle", en raison de la volonté de choisir, dans tous les cas, une composition devant répondre à différents impératifs pour assumer les fonctions qui lui sont dévolues. Parmi ces fonctions, il convient de citer celle de support d'accrochage en constituant une précouche pour des couches ultérieures, celle d'être de couleur le plus blanc possible, celle d'être d'un faible coût et celle de posséder l'aptitude de comblement des différences de surface présentées, ordinairement, par un papier.In a first example of implementation, the first operational phase of the process consists in depositing, on at least one of the faces of the substrate, a coating sauce, of traditional composition in stationery, at a rate of 3 to 25 g / m² , more particularly from 8 to 15 g / m² and, preferably, around 10 g / m². The coated sauce is said to be traditional by its composition, pigments, binders and additives conventionally used. A reservation must be made in the sense of the term "traditional", because of the desire to choose, in all cases, a composition that must meet different imperatives to assume the functions assigned to it. Among these functions, it should be mentioned that of attachment support by constituting a prelayer for subsequent layers, that of being as white as possible, that of being of low cost and that of having the ability filling in surface differences, usually presented by paper.

Pour que les fonctions ci-dessus puissent être assumées dans les meilleures conditions, la sauce de couchage comprend des pigments classiques incluant, de préférence, du kaolin, pigments répondant, pour au moins 60 % d'entre eux, à une granulométrie inférieure à 2 micromètres. Préférentiellement, les pigments choisis présentent, pour 90 % d'entre eux au moins, une granulométrie inférieure à 2 micromètres.In order for the above functions to be able to be carried out under the best conditions, the coating sauce comprises conventional pigments including, preferably, kaolin, pigments corresponding, for at least 60% of them, to a particle size less than 2 micrometers. Preferably, the pigments chosen have, for at least 90% of them, a particle size of less than 2 micrometers.

Parmi les pigments classiques, il convient de citer, par exemple, les carbonates de calcium, les kaolins, les talcs, les sulfates de calcium, les silicoaluminates, les blancs satins, les silices, les alumines et les hydroxydes d'aluminium.Among the conventional pigments, mention should be made, for example, of calcium carbonates, kaolins, talcs, calcium sulfates, silicoaluminates, satin whites, silicas, aluminas and aluminum hydroxides.

La composition de la sauce de couchage comprend, de façon également traditionnelle, des liants appropriés pour que la couche assume les fonctions ci-dessus, liants parmi lesquels il convient de citer les latex synthétiques, l'amidon, l'alcool polyvinylique, les protéines.The composition of the coating sauce also comprises, in a traditional manner, suitable binders so that the layer assumes the above functions, binders among which mention should be made of synthetic latexes, starch, polyvinyl alcohol, proteins.

Dans ce premier exemple, la sauce de couchage est exempte de pigments de brillance. Cette sauce est déposée pour former une précouche recouvrant régulièrement, de façon homogène et uniforme, la face de support. Cette précouche est déposée, par tout moyen approprié connu dans la technique, par exemple à la lame traînante.In this first example, the coating sauce is free of gloss pigments. This sauce is deposited to form a precoat regularly covering, in a homogeneous and uniform manner, the support face. This precoat is deposited, by any suitable means known in the art, for example with a trailing blade.

Après couchage, la précouche subit une phase de séchage naturel ou forcé, suivie, éventuellement, par une phase de calandrage exécutée à partir des moyens traditionnels en papeterie mais, de préférence, à température plus élevée que la température ambiante pour faciliter l'obtention ultérieure de brillance. Cette température peut être comprise entre l'ambiante et 150o C, par exemple entre 80 et 100o C. Le calandrage peut s'effectuer avec une pression de 0 à 300 kg par centimètre linéaire.After coating, the precoat undergoes a natural or forced drying phase, followed, if necessary, by a calendering phase carried out using traditional stationery means but, preferably, at a higher temperature than room temperature to facilitate subsequent production. of shine. This temperature can be between ambient and 150 o C, for example between 80 and 100 o C. Calendering can be carried out with a pressure of 0 to 300 kg per linear centimeter.

Après dépôt de la précouche, le procédé selon cette première mise en oeuvre prévoit de réaliser le dépôt d'au moins une couche dite de brillance, à raison de 1 à 10 g/m², préférentiellement à raison de 3 g/m². La couche de brillance est formée à partir d'une sauce de couchage à base de pigments traditionnels, du type de celui décrit en relation avec la précouche précédente. La sauce constitutive de la couche dite de brillance incorpore, toutefois, des pigments de brillance à raison d'au moins 20 % de parties en poids de la charge de pigments traditionnels incorporée à cette couche de brillance. Les pigments de brillance sont choisis pour présenter une granulométrie comprise entre 0,05 et 1 micromètre et, de préférence, voisine de 0,5 micromètre. Parmi les produits convenant particulièrement bien dans l'application visée, il convient de citer les copolymères styrènes acryliques, tels que, notamment, le produit commercialisé sous la marque "Ropaque" par la Société ROHM et HAAS ou, encore, les polystyrènes, tels que les produits commercialisés sous la marque "NYTRON" par la Société WILLIAMS. After depositing the precoat, the method according to this first implementation provides for the deposition of at least one so-called gloss layer, at a rate of 1 to 10 g / m², preferably at a rate of 3 g / m². The gloss layer is formed from a coating sauce based on traditional pigments, of the type described in relation to the previous precoat. The constituent sauce of the so-called gloss layer incorporates, however, gloss pigments at a rate of at least 20% by weight of the charge of traditional pigments incorporated in this gloss layer. The gloss pigments are chosen to have a particle size between 0.05 and 1 micrometer and, preferably, close to 0.5 micrometer. Among the products which are particularly suitable in the intended application, mention should be made of acrylic styrene copolymers, such as, in particular, the product sold under the brand name "Ropaque" by the company ROHM and HAAS or, again, polystyrenes, such as products marketed under the brand name "NYTRON" by the company WILLIAMS.

Des résultats particulièrement remarquables sont obtenus en constituant la sauce de la couche de brillance à partir de pigments traditionnels dont au moins 60 % d'entre eux, et préférentiellement 90 % d'entre eux, présentent une granulométrie inférieure à 2 micromètres. La couche de brillance est déposée par méthode de couchage traditionnel, également, de préférence, à la lame traînante, puis subit un séchage traditionnel ou forcé suivi d'un calandrage conventionnel à température habituelle. Cette température est, de préférence, le plus élevé possible pour améliorer la brillance, mais elle ne doit pas dépasser 105o C, afin d'éviter l'adhérence de la couche sur les rouleaux de la calandre. Le calandrage s'effectue à des pressions conventionnelles, par exemple de l'ordre de 100 à 300 kg par centimètre linéaire.Particularly remarkable results are obtained by constituting the sauce of the gloss layer from traditional pigments of which at least 60% of them, and preferably 90% of them, have a particle size of less than 2 micrometers. The gloss layer is deposited by traditional coating method, also preferably with a dragging blade, then undergoes traditional or forced drying followed by conventional calendering at usual temperature. This temperature is preferably as high as possible to improve the gloss, but it should not exceed 105 o C, in order to avoid adhesion of the layer on the rollers of the calender. Calendering is carried out at conventional pressures, for example of the order of 100 to 300 kg per linear centimeter.

De façon inattendue, la constitution d'une couche globale, en procédant comme dit ci-dessus, par dépôt d'une précouche suivie d'au moins une couche de brillance, permet d'obtenir, à partir d'un substrat de type de celui précisé précédemment, une caractéristique de brillance voisine de 85 %. Cette caractéristique est obtenue sans effet de grisage ou de plombage, en ne faisant intervenir globalement qu'une faible proportion de pigments plastiques de brillance réputés pour être d'un prix de revient élevé.Unexpectedly, the constitution of an overall layer, by proceeding as said above, by depositing a precoat followed by at least one gloss layer, makes it possible to obtain, from a substrate of the type of that specified above, a brightness characteristic close to 85%. This characteristic is obtained without the effect of graying or sealing, by globally involving only a small proportion of plastic pigments of gloss deemed to be of a high cost price.

Des résultats, particulièrement surprenants et avantageux, sont obtenus en déposant, sur la précouche du type décrit précédemment, deux couches superposées, dites de brillance, de semblable composition et déposées par couchage dans les mêmes conditions. Dans un tel cas, il est possible d'abaisser la proportion de pigments de brillance dans chacune des couches, tout en obtenant le résultat recherché. Des résultats convenables ont été obtenus en prévoyant 15 % de pigments de brillance pour la première couche superposée et 20 % pour la seconde couche dite supérieure.Results, particularly surprising and advantageous, are obtained by depositing, on the precoat of the type described above, two superimposed layers, called gloss, of similar composition and deposited by coating under the same conditions. In such a case, it is possible to lower the proportion of gloss pigments in each of the layers, while obtaining the desired result. Adequate results have been obtained by providing 15% of gloss pigments for the first superimposed layer and 20% for the second so-called upper layer.

Dans certains cas, il peut être avantageux de composer la couche de brillance à partir de 30 % de parties en poids de pigments de brillance, de 20 % de parties en poids de kaolin, dont 98 % au moins de préférence répond à une granulométrie de 2 micromètres, et de pigments et liants traditionnels en quantité suffisante complémentaire.In certain cases, it may be advantageous to compose the gloss layer from 30% by weight of gloss pigments, from 20% by weight of kaolin, of which 98% at least preferably corresponds to a particle size of 2 micrometers, and of pigments and traditional binders in sufficient additional quantity.

Dans certains cas, notamment, lorsque la précouche ne comporte pas de kaolin, il peut être envisagé de composer la couche, dite de brillance, à partir de 30 % de parties en poids de pigments de brillance et d'un complément à 100 % de kaolin pur, une telle composition étant complétée par des liants et additifs ordinaires prévus en une proportion pouvant être comprise entre 4 et 20 % de parties en poids.In certain cases, in particular, when the pre-layer does not contain kaolin, it may be envisaged to compose the layer, called the gloss layer, from 30% by weight of gloss pigments and a complement of 100% pure kaolin, such a composition being supplemented by ordinary binders and additives provided in a proportion which may be between 4 and 20% by weight.

Dans les exemples donnés précédemment, par parties en poids, il convient de considérer, comme base de référence, la masse de pigments traditionnels inclus à la précouche ou à la couche de brillance.In the examples given above, by parts by weight, it is necessary to consider, as a reference base, the mass of traditional pigments included in the pre-coat or in the gloss layer.

En raison de la mise en oeuvre d'un procédé de couchage traditionnel il devient possible, lorsque cela est souhaité, de traiter, comme dit précédemment ou de façon différente, les deux faces d'un même substrat, soit en des phases opératoires totalement différentes et délocalisées, soit, encore, en des phases opératoires successives ou simultanées en cas de traitement en continu d'une bande de grande longueur.Due to the implementation of a traditional coating process it becomes possible, when desired, to treat, as said previously or differently, the two faces of the same substrate, either in completely different operating phases and relocated, either again in successive or simultaneous operating phases in the event of continuous treatment of a strip of great length.

L'obtention d'une caractéristique haut brillant, à partir d'une faible incorporation de pigments de brillance inclus à la deuxième couche de brillance, permet de réaliser des papiers de caractéristiques recherchées pour un prix de revient particulièrement intéressant, ne faisant intervenir qu'un procédé traditionnel et un matériel connu pour sa mise en oeuvre.Obtaining a high gloss characteristic, from a low incorporation of gloss pigments included in the second gloss layer, makes it possible to produce papers with sought-after characteristics for a particularly attractive cost price, involving only a traditional process and a material known for its implementation.

Selon une variante du procédé, on dépose sur le substrat une première couche destinée à assumer la fonction de précouche et la fonction de première couche de brillance. A cette fin, on dépose sur le substrat, à raison de 5 à 20 g/m² et, de préférence, 10 g/m², selon des conditions habituelles, une couche de composition traditionnelle incluant une proportion inférieure à 15 % de parties en poids de pigments de brillance puis, ensuite, après séchage et calandrage éventuel, à raison d'environ 4 g/m², une seconde couche incluant 20 % de pigments de brillance. Cette seconde couche est séchée et calandrée et le substrat ainsi traité se caractérise par une brillance voisine de 87 %.According to a variant of the process, a first layer is deposited on the substrate intended to assume the function of prelayer and the function of first gloss layer. To this end, a layer of traditional composition including a proportion of less than 15% by weight is deposited on the substrate, at a rate of 5 to 20 g / m² and, preferably, 10 g / m², according to usual conditions. gloss pigments and then, after drying and possible calendering, at a rate of approximately 4 g / m², a second layer including 20% gloss pigments. This second layer is dried and calendered and the substrate thus treated is characterized by a gloss close to 87%.

On donne ci-après différents exemples de mise en oeuvre du procédé de l'invention.Various examples of implementation of the process of the invention are given below.

EXEMPLE 1 :EXAMPLE 1:

On a utilisé un support papier standard constitué, par exemple, de 50 % de fibres longues de résineux et de 50 % de fibres courtes de feuillus et enduit d'amidon en size presse pendant sa fabrication et caractérisé par les tests suivants : - Grammage ..... 66,5 g/m² - Porosité à l'air AFNOR Q 03075 ..... 2,3 - Collage Cobb (1 mn) (face 1/face 2) AFNOR Q 03014 ..... 20/18 - Lissé Bekk (face1/face 2) AFNOR Q 03012 ..... 19/21 - Brillance Hunterlab (face 1/face 2) TAPPI T 480 ..... 5/5 - Blancheur CIE (face 1/face 2) Méthode GANZ et BRIESSER ..... 128/122 A standard paper support was used consisting, for example, of 50% of long softwood fibers and of 50% of short hardwood fibers and coated with starch in size press during its manufacture and characterized by the following tests: - Weight ..... 66.5 g / m² - Air porosity AFNOR Q 03075 ..... 2.3 - Cobb bonding (1 min) (side 1 / side 2) AFNOR Q 03014 ..... 20/18 - Smooth Bekk (side 1 / side 2) AFNOR Q 03012 ..... 19/21 - Hunterlab sheen (side 1 / side 2) TAPPI T 480 ..... 5/5 - CIE Whiteness (side 1 / side 2) GANZ and BRIESSER method ..... 128/122

. Etape 1 :. Step 1 :

Dans un premier temps, ce support a été couché sur la face 1 avec une coucheuse à lame traînante avec la sauce de couchage suivante :
- 60 parties en poids (sec/sec) de carbonate de calcium naturel broyé Hydrocarb 90 fabriqué par la Société OMYA et caractérisé par une granulométrie de 90 % < 2 micromètres,
- 40 parties en poids (sec/sec) de kaolin HT commercialisé par la Société ENGELHARD,
- 10 parties en poids de latex synthétique DL 670 de la Société DOW CHEMICAL FRANCE,
- 0,3 parties en poids (sec/sec) de carboxyméthylcellulose de moyenne viscosité 7 M1 de la Société HERCULES,
- la quantité nécessaire d'eau pour obtenir une préparation à 65 % de teneur en matières solides,
- la quantité d'ammoniaque nécessaire pour obtenir un pH de 9,5.Initially, this support was coated on side 1 with a dragging coater with the following coating sauce:
- 60 parts by weight (dry / dry) of ground natural calcium carbonate Hydrocarb 90 manufactured by the company OMYA and characterized by a particle size of 90% <2 micrometers,
- 40 parts by weight (dry / dry) of kaolin HT marketed by the company ENGELHARD,
- 10 parts by weight of synthetic latex DL 670 of the DOW CHEMICAL FRANCE,
- 0.3 parts by weight (dry / dry) of carboxymethylcellulose of medium viscosity 7 M1 from the company HERCULES,
- the necessary amount of water to obtain a preparation with a 65% solids content,
- the quantity of ammonia necessary to obtain a pH of 9.5.

Le poids de couche déposé a été de 12 g/m² sur la face 1.The layer weight deposited was 12 g / m² on side 1.

. Etape 2 :. 2nd step :

Ce papier a été couché une deuxième fois sur la même face 1, à la lame traînante avec une formulation de couchage de composition suivante :
- 30 parties en poids (sec/sec) de pigment organique synthétique Ropaque OP 84 de la Société ROHM et HAAS,
- 70 parties en poids (sec/sec) de kaolin fin (98 % < 2 micromètres) Amazon 88 commercialisé par la Société EUROCLAY,
- 16 parties en poids (sec/sec) de latex synthétique Acronal 360 D de la Société BASF,
- 0,5 partie en poids (sec/sec) de carboxyméthylcellulose 7 M1 de la Société HERCULES,
- la quantité d'eau nécessaire pour obtenir une préparation avec une teneur en matières solides de 51 %,
- la quantité nécessaire d'ammoniaque pour obtenir un pH de 9,5.This paper was coated a second time on the same side 1, with a dragging blade, with a coating formulation of the following composition:
- 30 parts by weight (dry / dry) of Ropaque OP 84 synthetic organic pigment from the company ROHM and HAAS,
- 70 parts by weight (dry / dry) of fine kaolin (98% <2 micrometers) Amazon 88 sold by the company EUROCLAY,
- 16 parts by weight (dry / dry) of synthetic latex Acronal 360 D from the company BASF,
- 0.5 part by weight (dry / dry) of carboxymethylcellulose 7 M1 from the company HERCULES,
- the quantity of water necessary to obtain a preparation with a solids content of 51%,
- the necessary amount of ammonia to obtain a pH of 9.5.

Le poids de couche déposé a été de 4,5 g/m².The layer weight deposited was 4.5 g / m².

. Etape 3 :. Step 3:

Ce papier a ensuite été calandré dans les conditions habituellement utilisées pour obtenir des papiers brillants ordinaires (brillances de l'ordre de 65 %).This paper was then calendered under the conditions usually used to obtain ordinary glossy papers (glosses of the order of 65%).

Le papier obtenu avait les caractéristiques suivantes - Grammage ..... 83 g/m² - Lissé Bekk (face 1) AFNOR Q 0312 ..... 1 350 - Brillance Hunterlab (face 1) TAPPI T 480 ..... 87,5 - Blancheur CIE (face 1) Méthode GANZ et BRIESSER ..... 96 - Absence de plombage. The paper obtained had the following characteristics - Weight ..... 83 g / m² - Smooth Bekk (side 1) AFNOR Q 0312 ..... 1,350 - Hunterlab sheen (side 1) TAPPI T 480 ..... 87.5 - CIE Whiteness (face 1) GANZ and BRIESSER method ..... 96 - No sealing.

EXEMPLE 2 :EXAMPLE 2:

Le papier de l'exemple 2 a été fabriqué avec le même support et avec les mêmes étapes 1 et 3 que pour l'exemple 1. Au cours de l'étape 2, on a utilisé la formulation de couchage suivante :
- 50 parties en poids (sec/sec) de pigment organique synthétique Ropaque OP 84 de la Société ROHM et HAAS,
- 50 parties en poids (sec/sec) de kaolin fin (98 % < 2 micromètres) Amazon 88 commercialisé par la Société EUROCLAY,
- 16 parties en poids (sec/sec) de latex synthétique Acronal 360 D de la Société BASF,
- 0,5 partie en poids (sec/sec) de carboxyméthylcellulose 7 M1 de la Société HERCULES,
- la quantité d'eau nécessaire pour obtenir une préparation avec une teneur en matières solides de 51 %,
- la quantité nécessaire d'ammoniaque pour obtenir un pH de 9,5.The paper of example 2 was manufactured with the same support and with the same steps 1 and 3 as for example 1. In step 2, the following coating formulation was used:
- 50 parts by weight (dry / dry) of Ropaque OP 84 synthetic organic pigment from the company ROHM and HAAS,
- 50 parts by weight (dry / dry) of fine kaolin (98% <2 micrometers) Amazon 88 sold by the company EUROCLAY,
- 16 parts by weight (dry / dry) of synthetic latex Acronal 360 D from the company BASF,
- 0.5 part by weight (dry / dry) of carboxymethylcellulose 7 M1 from the company HERCULES,
- the quantity of water necessary to obtain a preparation with a solids content of 51%,
- the necessary amount of ammonia to obtain a pH of 9.5.

Le poids de couche déposé a été de 4,5 g/m².The layer weight deposited was 4.5 g / m².

Le papier obtenu avait les caractéristiques suivantes : - Grammage ..... 83 g/m² - Lissé Bekk (face 1) AFNOR Q 03012 ..... 1 370 - Brillance Hunterlab (face 1) TAPPI T 480 ..... 92 - Blancheur CIE (face 1) Méthode GANZ et BRIESSER ..... 97 - Absence de plombage. The paper obtained had the following characteristics: - Weight ..... 83 g / m² - Smooth Bekk (side 1) AFNOR Q 03012 ..... 1,370 - Hunterlab sheen (side 1) TAPPI T 480 ..... 92 - CIE Whiteness (face 1) GANZ and BRIESSER method ..... 97 - No sealing.

EXEMPLE 3 :EXAMPLE 3:

Le papier de l'exemple 3 a été fabriqué à partir du même support et avec la même première étape que ceux des exemples 1 et 2.The paper of Example 3 was made from the same support and with the same first step as that of Examples 1 and 2.

. Etape 2 :. 2nd step :

Le papier a été couché une deuxième fois sur la même face 1, à la lame traînante avec une formulation de couchage de composition suivante :
- 20 parties en poids (sec/sec) de pigment organique synthétique Ropaque OP 84 de la Société ROHM et HAAS,
- 80 parties en poids (sec/sec) de kaolin fin (98 % < 2 micromètres) Amazon 88 commercialisé par la Société EUROCLAY,
- 16 parties en poids (sec/sec) de latex synthétique Acronal 360 D de la Société BASF,
- 0,5 partie en poids (sec/sec) de carboxyméthycellulose 7 M1 de la Société HERCULES,
- la quantité d'eau nécessaire pour obtenir une préparation avec une teneur en matières solides de 51 %,
- la quantité nécessaire d'ammoniaque pour obtenir un pH de 9,5.The paper was coated a second time on the same side 1, with a dragging blade, with a coating formulation of the following composition:
- 20 parts by weight (dry / dry) of Ropaque OP 84 synthetic organic pigment from the company ROHM and HAAS,
- 80 parts by weight (dry / dry) of fine kaolin (98% <2 micrometers) Amazon 88 sold by the company EUROCLAY,
- 16 parts by weight (dry / dry) of synthetic latex Acronal 360 D from the company BASF,
- 0.5 part by weight (dry / dry) of carboxymethylcellulose 7 M1 from the company HERCULES,
- the quantity of water necessary to obtain a preparation with a solids content of 51%,
- the necessary amount of ammonia to obtain a pH of 9.5.

Le poids de couche déposé a été de 3 g/m².The layer weight deposited was 3 g / m².

. Etape 3 :. Step 3:

Ce papier a été couché une troisième fois sur la même face et avec la même formulation que dans l'étape 2.This paper was coated a third time on the same side and with the same formulation as in step 2.

Le poids de couche déposé a été de 2,5 g/m².The layer weight deposited was 2.5 g / m².

. Etape 4 :. Step 4:

Elle a consisté à calandrer le papier dans les mêmes conditions que celles des exemples 1 et 2.It consisted in calendering the paper under the same conditions as those of Examples 1 and 2.

Le papier obtenu avait les caractéristiques suivantes : - Grammage ..... 84 g/m² - Lissé Bekk (face 1) AFNOR Q 03012 ..... 1 450 - Brillance Hunterlab (face 1) TAPPI T 480 ..... 86,5 - Blancheur CIE (face 1) Méthode GANZ et BRIESSER ..... 95 - Absence de plombage. The paper obtained had the following characteristics: - Weight ..... 84 g / m² - Smooth Bekk (side 1) AFNOR Q 03012 ..... 1,450 - Hunterlab sheen (side 1) TAPPI T 480 ..... 86.5 - CIE Whiteness (face 1) GANZ and BRIESSER method ..... 95 - No sealing.

EXEMPLE 4 :EXAMPLE 4:

On a utilisé un support standard avec bois n'ayant pas subit d'enduction en size presse pendant sa fabrication et caractérisé par les tests suivants : - Grammage ...... 50,5 g/m² - Porosité à l'air AFNOR ..... 2 - Collage Cobb (1 mn) (face 1/face 2) AFNOR Q 03014 ..... 400/400 - Lissé Bekk (face 1/face 2) AFNOR Q 03012 ..... 36/23 - Brillance Hunterlab (face 1/face 2) TAPPI T 480 ..... 5/4 - Blancheur CIE (face 1/face 2) Méthode GANZ et BRIESSER ..... 44/46 We used a standard support with wood that was not coated in size press during its manufacture and characterized by the following tests: - Weight ...... 50.5 g / m² - AFNOR air porosity ..... 2 - Cobb bonding (1 min) (side 1 / side 2) AFNOR Q 03014 ..... 400/400 - Smooth Bekk (side 1 / side 2) AFNOR Q 03012 ..... 36/23 - Hunterlab sheen (side 1 / side 2) TAPPI T 480 ..... 5/4 - CIE Whiteness (side 1 / side 2) GANZ and BRIESSER method ..... 44/46

. Etape 1 :. Step 1 :

Dans un premier temps, ce support a été couché sur la face 1 avec une coucheuse "Gate roll" avec la sauce de couchage suivante :
- 100 parties en poids (sec/sec) de carbonate de calcium naturel broyé Hydrocarb 90 fabriqué par la Société OMYA et caractérisé par une granulométrie de 90 % < 2 micromètres,
- 30 parties en poids (sec/sec) d'amidon préalablement cuit dans les conditions standards,
- 0,4 parties en poids (sec/sec) d'azurant optique Leucophor CK de la Société SANDOZ,
- la quantité nécessaire d'eau pour obtenir une préparation à 53,5 % de teneur en matières solides.At first, this support was coated on side 1 with a "Gate roll" coater with the following coating sauce:
- 100 parts by weight (dry / dry) of ground natural calcium carbonate Hydrocarb 90 manufactured by the company OMYA and characterized by a particle size of 90% <2 micrometers,
- 30 parts by weight (dry / dry) of starch previously cooked under standard conditions,
- 0.4 parts by weight (dry / dry) of Leucophor CK optical brightener from the company SANDOZ,
- the necessary amount of water to obtain a preparation with a 53.5% solids content.

Le poids de couche déposé a été de 9 g/m² sur la face 1.The layer weight deposited was 9 g / m² on side 1.

. Etape 2 :. 2nd step :

Ce papier a été couché une deuxième fois sur la même face 1, à la lame traînante avec une formulation de couchage de composition suivante :
- 50 parties en poids (sec/sec) de pigment organique synthétique Ropaque OP 84 de La Société ROHM et HAAS,
- 50 parties en poids (sec/sec) de kaolin HT commercialisé par la Société ENGELHARD,
- 16 parties en poids (sec/sec) de latex synthétique Baysthal P 1 700 de la Société BAYER, - 0,7 partie en poids (sec/sec) de carboxyméthylcellulose 7 L2C de la Société HERCULES,
- 0,85 parties en poids (sec/sec) d'azurant optique Leucophor CK de la Société SANDOZ,
- la quantité d'eau nécessaire pour obtenir une préparation avec une teneur en matières solides de 51 %,
- la quantité nécessaire d'ammoniaque pour obtenir un pH de 9,5.This paper was coated a second time on the same side 1, with a dragging blade, with a coating formulation of the following composition:
- 50 parts by weight (dry / dry) of synthetic organic pigment Ropaque OP 84 from The Company ROHM and HAAS,
- 50 parts by weight (dry / dry) of kaolin HT marketed by the ENGELHARD Company ,
- 16 parts by weight (dry / dry) of Baysthal P 1 700 synthetic latex from the company Bayer, - 0.7 parts by weight (dry / dry) of carboxymethylcellulose 7 L2C from the company Hercules,
- 0.85 parts by weight (dry / dry) of Leucophor CK optical brightener from the company SANDOZ,
- the quantity of water necessary to obtain a preparation with a solids content of 51%,
- the necessary amount of ammonia to obtain a pH of 9.5.

Le poids de couche déposé a été de 4,5 g/m².The layer weight deposited was 4.5 g / m².

. Etape 3 :. Step 3:

Le papier a été calandré dans les mêmes conditions que pour les exemples 1, 2 et 3.The paper was calendered under the same conditions as for Examples 1, 2 and 3.

Le papier obtenu avait les caractéristiques suivantes : - Grammage ..... 64 g/m² - Lissé Bekk (face 1) AFNOR Q 03012 ..... 1 370 - Brillance Hunterlab (face 1) TAPPI T 480 ..... 81 - Blancheur CIE (face 1) Méthode GANZ et BRIESSER ..... 88 - Absence de plombage. The paper obtained had the following characteristics: - Weight ..... 64 g / m² - Smooth Bekk (side 1) AFNOR Q 03012 ..... 1,370 - Hunterlab sheen (side 1) TAPPI T 480 ..... 81 - CIE Whiteness (face 1) GANZ and BRIESSER method ..... 88 - No sealing.

EXEMPLE 5 :EXAMPLE 5:

On a utilisé le même support que pour les exemples 1, 2 et 3.The same support was used as for Examples 1, 2 and 3.

. Etape 1 :. Step 1 :

Dans un premier temps, ce support a été couché sur la face 1 avec une coucheuse à lame traînante avec la sauce de couchage suivante :
- 50 parties en poids (sec/sec) de carbonate de calcium naturel broyé Hydrocarb 90 fabriqué par la Société OMYA et caractérisé par une granulométrie de 90 % < 2 micromètres,
- 40 parties en poids (sec/sec) de kaolin HT commercialisé par la Société ENGELHARD,
- 10 parties en poids (sec/sec) de pigment organique synthétique Ropaque OP 84 de la Société ROHM et HASS,
- 10 parties en poids de latex synthétique DL 670 de la Société DOW CHEMICAL FRANCE,
- 0,3 parties en poids (sec/sec) de carboxyméthylcellulose de moyenne viscosité 7 M1 de la Société HERCULES, - la quantité nécessaire d'eau pour obtenir une préparation à 65 % de teneur en matières solides,
- la quantité d'ammoniaque nécessaire pour obtenir un pH de 9,5.Initially, this support was coated on side 1 with a dragging coater with the following coating sauce:
- 50 parts by weight (dry / dry) of ground natural calcium carbonate Hydrocarb 90 manufactured by the company OMYA and characterized by a particle size of 90% <2 micrometers,
- 40 parts by weight (dry / dry) of kaolin HT marketed by the company ENGELHARD,
- 10 parts by weight (dry / dry) of Ropaque OP 84 synthetic organic pigment from the company ROHM and HASS,
- 10 parts by weight of synthetic latex DL 670 from the company DOW CHEMICAL FRANCE,
- 0.3 parts by weight (dry / dry) of carboxymethylcellulose of medium viscosity 7 M1 from the company HERCULES, - the necessary amount of water to obtain a preparation for 65% solids content,
- the quantity of ammonia necessary to obtain a pH of 9.5.

Le poids de couche déposé a été de 12 g/m² sur la face 1.The layer weight deposited was 12 g / m² on side 1.

. Etape 2 :. 2nd step :

Ce papier a été couhé une deuxième fois sur la même face 1, à la lame traînante avec une formulation de couchage de composition suivante :
- 20 parties en poids (sec/sec) de pigment organique synthétique Ropaque OP 84 de la Société ROHM et HAAS,
- 80 parties en poids (sec/sec) de kaolin fin (98 % < 2 micromètres) Amazon 88 commercialisé par la Société EUROCLAY,
- 16 parties en poids (sec/sec de latex synthétique Acronal 360 D de la Société BASF,
- 0,5 partie en poids (sec/sec) de carboxyméthylcellulose 7 M1 de la Société HERCULES,
- la quantité d'eau nécessaire pour obtenir une préparation avec une teneur en matières solides de 51 %,
- la quantité nécessaire d'ammoniaque pour obtenir un pH de 9,5.This paper was coated a second time on the same side 1, with a dragging blade with a coating formulation of the following composition:
- 20 parts by weight (dry / dry) of Ropaque OP 84 synthetic organic pigment from the company ROHM and HAAS,
- 80 parts by weight (dry / dry) of fine kaolin (98% <2 micrometers) Amazon 88 sold by the company EUROCLAY,
- 16 parts by weight (dry / dry of Acronal 360 D synthetic latex from BASF,
- 0.5 part by weight (dry / dry) of carboxymethylcellulose 7 M1 from the company HERCULES,
- the quantity of water necessary to obtain a preparation with a solids content of 51%,
- the necessary amount of ammonia to obtain a pH of 9.5.

Le poids de couche déposé a été de 4,5 g/m².The layer weight deposited was 4.5 g / m².

. Etape 3 :. Step 3:

Ce papier couché a ensuite été calandré dans les conditions habituellement utilisées pour obtenir des papiers brillants ordinaires (brillances de l'ordre de 65 %).This coated paper was then calendered under the conditions usually used to obtain ordinary glossy papers (glosses of the order of 65%).

Le papier obtenu avait les caractéristiques suivantes : - Grammage ..... 83 g/m² - Lissé Bekk (face 1) AFNOR Q 03012 ..... 1 750 - Brillance Hunterlab (face 1) TAPPI T 480 ..... 87 - Blancheur CIE (face 1) Méthode GANZ et BRIESSER ..... 97 - Absence de plombage. The paper obtained had the following characteristics: - Weight ..... 83 g / m² - Smooth Bekk (side 1) AFNOR Q 03012 ..... 1,750 - Hunterlab sheen (side 1) TAPPI T 480 ..... 87 - CIE Whiteness (face 1) GANZ and BRIESSER method ..... 97 - No sealing.

Le tableau ci-dessous donne les valeurs comparatives de tests d'impression pratiqués de façon identique sur des papiers selon les exemples 1 à 5 et sur un papier standard de référence. EXEMPLE N o 1 2 3 4 5 Papier standard Brillance d'encre type offset, Lorilleux 3810 (*) 95 96 95 89 94 82 Impression "héliotest" nombre de points manquants (**) 7 - 3 - 13 67 (*) L'héliotest correspond à la norme NF Q 61002. (**) Le test de brillance d'encre type offset non normalisé consiste à imprimer le papier avec une presse d'essai IGT à la vitesse de 0,2 m/s, avec une pression de 10 kg/cm². The table below gives the comparative values of printing tests carried out identically on papers according to Examples 1 to 5 and on standard reference paper. EXAMPLE No. 1 2 3 4 5 Standard paper Offset ink gloss, Lorilleux 3810 (*) 95 96 95 89 94 82 Printing "heliotest" number of missing points (**) 7 - 3 - 13 67 (*) The heliotest corresponds to standard NF Q 61002. (**) The non-standard offset ink gloss test consists of printing the paper with an IGT test press at a speed of 0.2 m / s, with a pressure of 10 kg / cm².

L'invention n'est pas limitée aux exemples décrits et représentés, car diverses modifications peuvent y être apportées sans sortir de son cadre.The invention is not limited to the examples described and shown, since various modifications can be made thereto without going beyond its scope.

Claims (14)

1 - Procédé d'obtention d'un support haut brillant, du type consistant à déposer sur un substrat une sauce de couchage de composition traditionnelle en papeterie, additionnée d'une proportion de pigments de brillance à base de polymères ou copolymères organiques,
caractérisé en ce qu'il consiste à :
- déposer sur le substrat une première couche de composition traditionnelle à raison de 3 à 25 g/m²,
- déposer sur la première couche, à raison de 1 à 10 g/m², au moins une couche supérieure dite de brillance formée d'une sauce à base de pigments traditionnels de granulométrie d'au moins 60 % inférieure à 2 micromètres, d'au moins un liant traditionnel en quantité suffisante et de pigments de brillance à raison d'au moins 20 % de parties en poids de la charge de pigments traditionnels et répondant à une granulométrie comprise entre 0,05 et 1 micromètre et, de préférence, voisine de 0,5 micromètre. 1 - Process for obtaining a high-gloss support, of the type consisting in depositing on a substrate a coating sauce of traditional composition in stationery, added with a proportion of gloss pigments based on organic polymers or copolymers,
characterized in that it consists of:
- deposit on the substrate a first layer of traditional composition at a rate of 3 to 25 g / m²,
- deposit on the first layer, at a rate of 1 to 10 g / m², at least one upper layer called shine formed of a sauce based on traditional pigments with a particle size of at least 60% less than 2 micrometers, at least one traditional binder in sufficient quantity and of gloss pigments at a rate of at least 20% by weight of the charge of traditional pigments and corresponding to a particle size between 0.05 and 1 micrometer and, preferably, close 0.5 micrometer. 2 - Procédé selon la revendication 1, caractérisé en ce qu'il consiste à déposer, sur la première couche, au moins deux couches de brillance, superposées, de même composition traditionnelle, la première comportant au moins 15 % de parties en poids de pigments de brillance et la seconde, dite supérieure, au moins 20 % de parties en poids de ces mêmes pigments. 2 - Process according to claim 1, characterized in that it consists in depositing, on the first layer, at least two gloss layers, superimposed, of the same traditional composition, the first comprising at least 15% by weight of pigments of gloss and the second, called superior, at least 20% by weight of these same pigments. 3 - Procédé selon la revendication 1 ou 2, caractérisé en ce qu'on dépose, sur la précouche, au moins une couche de brillance contenant environ 20 % de parties en poids de kaolin, de granulométrie d'au moins 98 %, inférieures à 2 micromètres. 3 - Method according to claim 1 or 2, characterized in that is deposited on the precoat, at least one gloss layer containing about 20% by weight of kaolin, with a particle size of at least 98%, less than 2 micrometers. 4 - Procédé selon la revendication 1 ou 2, caractérisé en ce qu'on dépose, sur la précouche, au moins une couche de brillance composée de 30 % de parties en poids de pigments de brillance, 70 % de parties en poids de kaolin, de granulométrie d'au moins 98 % inférieure à 2 micromètres, à titre de pigments traditionnels, et la quantité suffisante de liants. 4 - Process according to claim 1 or 2, characterized in that at least one gloss layer composed of 30% of parts by weight of gloss pigments, 70% of parts by weight of kaolin is deposited on the precoat, particle size of at least 98% less than 2 micrometers, as traditional pigments, and the sufficient quantity of binders. 5 - Procédé selon la revendication 1, 3 ou 4, caractérisé en ce qu'on dépose, sur le substrat, à raison d'environ 10 g/m², une première couche contenant de 0 à 15 % de parties en poids de pigments de brillance et une seconde couche à raison d'environ 4 g/m² contenant environ 20 % de parties en poids de pigments de brillance. 5 - A method according to claim 1, 3 or 4, characterized in that is deposited on the substrate, at a rate of about 10 g / m², a first layer containing from 0 to 15% by weight of pigments of gloss and a second layer at a rate of approximately 4 g / m² containing approximately 20% by weight of gloss pigments. 6 - Procédé selon l'une des revendications 1 à 5, caractérisé en ce qu'on dépose, sur la précouche, au moins une couche de brillance contenant de 4 à 20 % de parties en poids de liants et adjuvants traditionnels. 6 - Method according to one of claims 1 to 5, characterized in that is deposited on the precoat, at least one gloss layer containing from 4 to 20% by weight of traditional binders and adjuvants. 7 - Procédé selon l'une des revendications 1 à 6, caractérisé en ce que chaque couche est soumise à un séchage naturel ou forcé suivi d'une phase de calandrage traditionnel. 7 - Method according to one of claims 1 to 6, characterized in that each layer is subjected to natural or forced drying followed by a traditional calendering phase. 8 - Support haut brillant du type comprenant un substrat dont l'une des faces au moins est revêtue d'une sauce de couchage de composition traditionnelle additionnée d'une proportion de pigments de brillance à base de polymères ou copolymères organiques,
caractérisé en ce qu'il comprend, sur au moins une face :
- une première couche d'une sauce de couchage traditionnelle déposée à raison de 3 à 25 g/m²,
- au moins une couche superposée, dite supérieure, formée d'une sauce déposée à raison de 1 à 10 g/m² et à base de pigments traditionnels de granulométrie d'au moins 60 % inférieure à 2 micromètres, d'au moins un liant traditionnel en quantité suffisante et de pigments de brillance à raison d'au moins 20 % de parties en poids de la charge de pigments traditionnels et répondant à une granulométrie comprise entre 0,05 et 1 micromètre et, de préférence, voisine de 0,5 micromètre. 8 - High gloss support of the type comprising a substrate of which at least one of the faces is coated with a coating sauce of traditional composition added with a proportion of gloss pigments based on organic polymers or copolymers,
characterized in that it comprises, on at least one face:
- a first layer of a traditional coating sauce deposited at a rate of 3 to 25 g / m²,
- at least one superimposed layer, called the upper layer, formed of a sauce deposited at a rate of 1 to 10 g / m² and based on traditional pigments with a particle size of at least 60% less than 2 micrometers, of at least one binder traditional in sufficient quantity and gloss pigments at a rate of at least 20% by weight of the charge of traditional pigments and corresponding to a particle size between 0.05 and 1 micrometer and, preferably, close to 0.5 micrometer. 9 - Support haut brillant selon la revendication 8, caractérisé en ce qu'il comprend au moins deux couches de brillance superposées, l'une dite supérieure comprenant au moins 20 % de pigments de brillance, l'autre dite intermédiaire comportant au moins 15 % de pigments en brillance. 9 - High gloss support according to claim 8, characterized in that it comprises at least two superimposed gloss layers, one said to be superior comprising at least 20% of gloss pigments, the other said to be intermediate comprising at least 15% of bright pigments. 10 - Support haut brillant selon la revendication 8 ou 9, caractérisé en ce qu'il comprend une première couche exempte de pigments de brillance et au moins une couche de brillance. 10 - High gloss support according to claim 8 or 9, characterized in that it comprises a first layer free of gloss pigments and at least one layer of gloss. 11 - Support haut brillant selon la revendication 8 ou 9, caractérisé en ce qu'il comprend une première couche déposée à raison d'environ 10 g/m² et contenant entre 0 et 15 % de parties en poids de pigments de brillance et une deuxième couche à raison d'environ 4 g/m² contenant environ 20 % de parties en poids de pigments de brillance. 11 - High gloss support according to claim 8 or 9, characterized in that it comprises a first layer deposited at the rate of approximately 10 g / m² and containing between 0 and 15% by weight of gloss pigments and a second layer at a rate of approximately 4 g / m² containing approximately 20% by weight of gloss pigments. 12 - Support haut brillant selon l'une des revendications 8 à 11, caractérisé en ce que la couche de brillance contient environ 20 % de parties en poids de kaolin de granulométrie d'au moins 98 % inférieure à 2 micromètres. 12 - High gloss support according to one of claims 8 to 11, characterized in that the gloss layer contains approximately 20% by weight of kaolin with a particle size of at least 98% less than 2 micrometers. 13 - Support haut brillant selon l'une des revendications 8 à 12, caractérisé en ce que la couche de brillance contient 30 % de parties en poids de pigments de brillance et 70 % de parties en poids de kaolin de granulométrie d'au moins 98 % inférieure à 2 micromètres, à titre de pigment traditionnel. 13 - High-gloss support according to one of Claims 8 to 12, characterized in that the gloss layer contains 30% by weight of gloss pigments and 70% by weight of kaolin with a particle size of at least 98 % less than 2 micrometers, as a traditional pigment. 14 - Support haut brillant selon l'une des revendications 8 à 13, caractérisé en ce que la couche de brillance comprend de 4 à 20 % de parties en poids de liant et adjuvants traditionnels. 14 - High gloss support according to one of claims 8 to 13, characterized in that the gloss layer comprises from 4 to 20% by weight of traditional binder and adjuvants.
EP90420175A 1989-04-10 1990-04-06 Process for obtaining a high-gloss base and the base so produced Expired - Lifetime EP0395539B1 (en)

Applications Claiming Priority (2)

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FR8904939 1989-04-10
FR8904939A FR2645555B1 (en) 1989-04-10 1989-04-10 METHOD FOR OBTAINING A HIGH-GLOSSY MEDIUM AND MEDIUM OBTAINED

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EP0395539A1 true EP0395539A1 (en) 1990-10-31
EP0395539B1 EP0395539B1 (en) 1993-11-03

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EP (1) EP0395539B1 (en)
JP (1) JPH0314699A (en)
AT (1) ATE96865T1 (en)
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DK (1) DK0395539T3 (en)
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FR (1) FR2645555B1 (en)
IE (1) IE63967B1 (en)
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ES2047890T3 (en) 1994-03-01
PT93701B (en) 1997-06-30
US5169715A (en) 1992-12-08
FI95945C (en) 1996-04-10
ATE96865T1 (en) 1993-11-15
DE69004322D1 (en) 1993-12-09
FI95945B (en) 1995-12-29
NO176527B (en) 1995-01-09
NO171548B (en) 1992-12-21
FR2645555A1 (en) 1990-10-12
JPH0314699A (en) 1991-01-23
FR2645555B1 (en) 1991-07-19
NO901596D0 (en) 1990-04-09
DK0395539T3 (en) 1994-03-21
DE69004322T2 (en) 1994-05-05
EP0395539B1 (en) 1993-11-03
IE901279L (en) 1990-10-10
PT93701A (en) 1990-11-20
NO901596A (en) 1990-10-11
FI901786A0 (en) 1990-04-09
IE63967B1 (en) 1995-06-28
CA2014319A1 (en) 1990-10-10
NO176527C (en) 1995-04-19

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