WO2000002734A1 - Formulation suitable for ink receptive coatings - Google Patents
Formulation suitable for ink receptive coatings Download PDFInfo
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- WO2000002734A1 WO2000002734A1 PCT/US1999/013945 US9913945W WO0002734A1 WO 2000002734 A1 WO2000002734 A1 WO 2000002734A1 US 9913945 W US9913945 W US 9913945W WO 0002734 A1 WO0002734 A1 WO 0002734A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/02—Ingredients treated with inorganic substances
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5236—Macromolecular coatings characterised by the use of natural gums, of proteins, e.g. gelatins, or of macromolecular carbohydrates, e.g. cellulose
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5245—Macromolecular coatings characterised by the use of polymers containing cationic or anionic groups, e.g. mordants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/14—Pore volume
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- 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
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
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- 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
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249955—Void-containing component partially impregnated with adjacent component
- Y10T428/249956—Void-containing component is inorganic
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- 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
- Y10T428/253—Cellulosic [e.g., wood, paper, cork, rayon, etc.]
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- 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
- Y10T428/256—Heavy metal or aluminum or compound thereof
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- 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
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
Definitions
- This invention relates to formulations comprising inorganic oxide particles.
- this invention relates to ink receptive coating formulations for paper comprising a novel porous, fine inorganic oxide which provides excellent ink absorption properties, and if desired, glossy finishes.
- Ink receptive coatings typically contain various proportions of inorganic pigments and binder(s). The proportions of these components affect the properties of these coatings, e.g., ink absorption properties.
- One means of characterizing the proportion of inorganic pigment relative to the proportion of binder is by the pigment volume concentration, or PVC.
- the definition of pigment volume concentration (PVC) is: 100* V p /(V p + V b ), where V p is the volume of the pigment and V b is the volume of the binder.
- the binder When a coating is formulated at low PVC, the binder constitutes the continuous phase of the coating within which pigment particles are dispersed. When a coating is formulated at high PVC, the binder phase is no longer a continuous phase, that is, there is not enough binder to fill the voids between packed and semi-rigid or rigid pigment particles.
- the proportion at which the binder is no longer considered the continuous phase is referred to in the art as the critical pigment volume concentration (CPVC).
- CPVC critical pigment volume concentration
- ink-receptive coatings are relatively impermeable to water.
- ink-receptive coatings are the ability to absorb the ink fluid rapidly so that the image becomes fixed to the media as quickly as possible. This minimizes smudging.
- One known formulation comprising hygroscopic binders is an ink- receptive coating formulated at low PVC using colloidal silica as the pigment in conjunction with hygroscopic binders such as PVOH. These formulations generally result in relatively glossy coatings and the hygroscopic binders absorb moisture via partial solubility of the ink- fluid.
- the colloidal silica in this instance serves to modify the coating properties to improve the image characteristics once the coatings is printed.
- colloidal silica is non- porous and coatings prepared from colloidal silicas are relatively dense. Such a coating therefore lacks capacity to absorb large quantities of liquid ink. Furthermore, ink-drytimes are relatively slow.
- the formulations of this invention comprise binder and porous inorganic oxide particles or pigments which have a median particle size in the range of 0.05 to about 3 microns.
- the particles of this invention have a porous structure such that at least about 0.5 cc/g of the pore volume is from pores having a pore size of 600A or less. Porosity from pores less than 600A is referred to herein as internal porosity, i.e., porosity present in the particles themselves. Indeed, the internal porosity is reflected by a "viscosity derived pore volume", defined later below, of at least about 0.5 cc/g.
- silica gel particles in which at least about 0.7 cc/g and at least 0.9 cc/g of pore volume is from pores having sizes less than 600A. In these embodiments, at least 80% of the pore volume is from pores having pore sizes less than 300A.
- the internal porosity of the particles in this invention is relatively stable and unlike prior art precipitated silicas is less susceptible to complete collapse under capillary pressures created when the water evaporates from the dispersion during drying.
- the formulations can be coated onto substrates and dried to form a porous layer which is particularly suitable as an ink receptive layer, e.g., ink jet paper.
- the dried layer resulting from the formulation generally has good ink abso ⁇ tion properties.
- Embodiments comprising particles having a median particle size in the range of 0.05 to 1 micron can be used to prepare relatively high gloss finishes, particularly for photorealistic printing.
- Figure 1 shows a graph of — versus mass fraction solids for ⁇ dispersions of particles used in several embodiments of the invention and prior art colloidal silica, wherein ⁇ is the viscosity of the dispersions illustrated and ⁇ Q is the viscosity of water.
- Mass fraction solids include undissolved particles and does not include dissolved salts.
- Figure 2A shows a graph of — versus mass fraction solids wherein ⁇ ⁇ is the viscosity of dispersions of particles used in one embodiment of the invention wherein the particles comprise a hydrous silica gel. and ⁇ a is the viscosity of water, (o) represents data for viscosity and loadings before milling. (D) represents data for viscosity and loadings after being milled, and ( ⁇ ) represents data for viscosities and loadings of dispersions after being milled and centrifuged at 600 G's.
- Figure 2B is a graph of the same data for precipitated silica commercially available as ZeothixTM 177.
- (o) and(D) represents the same type of data indicated for Figure 2A.
- ( ⁇ ) represents data for a dispersion which had been milled and centrifuged at 2,000 G.
- Figure 2C is a graph of the same data generated for Figure 2 A. but is generated for a precipitated silica commercially available as FK310 from Degussa. (o), (D) and ( ⁇ ) represent the same type of data indicated for Figure 2A.
- Figure 3 is graph correlating viscosity derived pore volume (PVa) and dried pore volume measurements for particles used in the invention.
- the inorganic oxide particles used in this invention can be prepared from conventional inorganic oxide materials. Suitable inorganic oxides include precipitated inorganic oxides and inorganic oxide gels. These inorganic oxides are referred to herein as "parent inorganic oxides.” “parent particles” or “parent dispersions”. Amo ⁇ hous precipitated silica and silica gels are particularly suitable parent inorganic oxides.
- the particles can also be prepared from mixed inorganic oxides including SiO 2 «Al 2 0,, MgO.SiO 2 .Al 2 O The mixed inorganic oxides can be prepared by conventional blending or cogelling procedures.
- Suitable inorganic oxide gels include, but are not limited to, gels comprising SiO 2 , Al 2 Ofind AlPO 4 , MgO, TiO 2 . and ZrO 2 .
- the gels can be hydrogels, aerogels, or xerogels.
- a hydrogel is also known as an aquagel which is formed in water and as a result its pores are filled with water.
- a xerogel is a hydrogel with the water removed.
- An aerogel is a type of xerogel from which the liquid has been removed in such a way as to minimize collapse or change in the gel's structure as the water is removed.
- Silica gels commercially available as Syloid® grade gels, e.g., grades 74, 221. 234. 244. W300, W500, and GenesisTM silica gels are suitable parent inorganic oxides.
- Gels are well known in the art. See Iler's "The Chemistry of Silica", p. 462 (1979).
- Gel e.g. silica gel. particles are distinguishable from colloidal silica or precipitated silica particles.
- colloidal silica is prepared as a slurry of dense, non-porous silica particles.
- Colloidal silica particles typically are smaller than 200nm (0.2 micron). As mentioned earlier, these particles do not have internal porosit ⁇ '.
- typical precipitated particles have some internal porosity. In some cases, the internal porosity in those particles, however, largely collapses under capillary pressure created by receding menisci of water as the water evaporates during drying.
- the conditions for making colloidal silica and precipitated silica are well known.
- Gels are prepared under conditions which promote coalescence of primary particles (typically having median particles sizes of 1 to lOnm. as measured under by transmission electron microscopy, i.e.. TEM) to form a relatively rigid three dimensional network.
- primary particles typically having median particles sizes of 1 to lOnm. as measured under by transmission electron microscopy, i.e.. TEM
- the coalescence of gel is exhibited on a macroscale when a dispersion of inorganic oxide, e.g.. silica, hardens to a "gel” or “gelled” mass having structural integrity.
- a silica gel is prepared by mixing an aqueous solution of an alkali metal silicate (e.g.. sodium silicate) with a strong acid such as nitric or sulfuric acid, the mixing being done under suitable conditions of agitation to form a clear silica sol which sets into a hydrogel. i.e., macrogel, in less than about one-half hour. The resulting gel is then washed.
- concentration of inorganic oxide, i.e., SiO 2 formed in the hydrogel is usually in the range of about 10 and about 50. preferably between about 20 and about 35.
- the pH, temperature, and duration of the wash water will influence the physical properties of the silica, such as surface area (SA) and pore volume (PV).
- SA surface area
- PV pore volume
- Silica gel washed at 65-90°C at pH ' s of 8-9 for 15-36 hours will usually have SA's of 250-400 and form aerogels with PVs of 1.4 to 1.7 cc/gm.
- Silica gel washed at pH " s of 3-5 at 50-65°C for 15-25 hours will have SA " s of 700- 850 and form aerogels with PVs of 0.6-1.3.
- inorganic oxide gels such as alumina and mixed inorganic oxide gels such as silica/alumina cogels are also well known in the art. Methods for preparing such gels are disclosed in U.S. Patents 4,226.743. the contents of which are incorporated by reference.
- alumina gels are prepared by mixing alkali metal aluminates and aluminum sulfate.
- Cogels are prepared by cogeliing two metal oxides so that the gels are composited together.
- silica alumina cogels can be prepared by gelling an alkali metal silicate with an acid or acid salt, and then adding alkali metal aluminate, aging the mixture and subsequently adding aluminum sulfate. The gel is then washed using conventional techniques.
- Another embodiment comprises particles derived from dispersions of certain precipitated inorganic oxides.
- milling certain precipitated silicas results in dispersions having the porosity properties described later below. Viscosity of certain precipitates as a function of mass fraction is illustrated in Figure 1.
- reinforced precipitated silica such as that described in U.S. Patent 4,157.920 can also be used to prepare the particles of this invention.
- reinforced precipitated silicas can be prepared by first acidulating an alkali inorganic silicate to create an initial precipitate. The resulting precipitate is then reinforced or "post conditioned" by additional silicate and acid. The precipitate resulting from the second addition of silicate and acid comprises 10 to 70% by weight of the precipitate initially prepared. It is believed that the reinforced structure of this precipitate is more rigid than conventional precipitates as a result of the second precipitation. It is believed that even after milling, centrifuging and subsequent drying, the reinforced silicate substantially maintains its network rigidity and porosity. This is in contrast to other reported precipitated silicas such as those disclosed in U.S. Patent
- an inorganic oxide is selected for the porous particle, it is dispersed in a liquid phase to form a parent dispersion.
- the medium for the liquid phase can be aqueous or organic.
- the liquid phase can be residual water in inorganic oxide gels which have been drained, but not yet dried, and to which additional water is added to reslurry the gel.
- dried inorganic oxides e.g.. xerogels, are dispersed in liquid medium.
- the parent dispersion should be in a state that can be wet milled. In most embodiments, the parent dispersion has a median particle size approximately in the range of 10 to 40 microns.
- the size of the parent particles only needs to be sufficient such that the mill being used can produce a dispersion having the desired median particle size at about or below 3 microns.
- the drained gel may first be broken up into gel chunks and premilled to produce a dispersion of particles in the range of 10 to 40 microns.
- the parent dispersion is then milled.
- the milling is conducted "wet' " , i.e., in liquid media.
- the general milling conditions can vary depending on the feed material, residence time, impeller speeds, and milling media particle size. Suitable conditions and residence times are described in the Examples. These conditions can be varied to obtain the desired size within the range of 0.05 to about 3 microns. The techniques for selecting and modifying these conditions to obtain the desired dispersions are known to those skilled in the art.
- the milling equipment used to mill the parent inorganic oxide particles should be of the type capable of severely milling and reducing materials to particles having sizes about three microns or smaller, particularly below one micron, e.g., through mechanical action.
- Such mills are commercially available, with hammer and sand mills being particularly suitable for this pu ⁇ ose.
- Hammer mills impart the necessary mechanical action through high speed metal blades
- sand mills impart the action through rapidly churning media such as zirconia or sand beads.
- Impact mills can also be used. Both impact mills and hammer mills reduce particle size by impact of the inorganic oxide with metal blades.
- a dispersion comprising particles of three microns or smaller is then recovered as the final product. This dispersion can then be added to the binder and any additives employed.
- the milled dispersion may also be further processed.
- further processing is desirable if there is need to insure that essentially all of the distribution of particles is below 2 microns, and especially when dispersions in the size range of 1 micron or less is desired, e.g., for glossy paper finishes.
- the milled dispersion is processed to separate the dispersion into a supernatant phase, which comprises the particles to be used, and a settled phase which comprises larger particles.
- the separation can be created by centrifuging the milled inorganic oxide particles.
- the supernatant phase is then removed from the settled phase, e.g., by decanting.
- the settled phase also can be regarded as the particles to be added to the formulation.
- the settled phase can be removed and redispersed as the particles which are added to the formulation.
- centrifuges can be used for this phase separation.
- a commercially available centrifuge suitable for this invention is identified in the Examples below. In some instances, it may be preferable to centrifuge the supernatant two. three or more times to further remove large particles remaining after the initial centrifuge. It is also contemplated that the larger particles of a milled dispersion can separate over time under normal gravity conditions, and the supernatant can be removed by decanting.
- the dispersion of particles also can be modified after milling to insure a stable dispersion. This can be accomplished through pH adjustment, e.g., adding alkaline material, or by the addition of conventional dispersants.
- the median particle size, i.e., particle diameter, of the porous inorganic particles of this invention is in the range of 0.05 to about 3 microns.
- the size is primarily dictated by the formulation and can be in ranges of, e.g.. between 0.06 to 2.9. 0.07 to 2.8, and so on.
- the median particle size will generally be less than one micron, and for some typical applications, the dispersion has a median particle size below 0.5 micron, and preferably in the range of 0.1 and 0.3 micron.
- the median particle size is measured using conventional light scattering instrumentation and methods. The sizes reported in the Examples were determined by a LA900 laser scattering particle size analyzer from Horiba Instruments. Inc.
- the properties of the dispersion can be adjusted depending on the type of coating to be produced from the formulation and the type of binder to which the particles are to be added.
- the dispersion's viscosity should be such that the dispersion can be added to the other components of the formulation.
- the viscosity of the dispersion is highly dependent upon the dispersion's solids content and the porosity of the particles.
- the solids content of the dispersion is generally in the range of 1 -30% by weight, and all ranges in between, although in certain applications, the amount can be higher or lower.
- a solids content in the range of 10 to 20% by weight is suitable for a number of applications.
- Viscosity enhancers and agents can also be used to obtain the appropriate viscosity.
- the viscosity can range from 1 to over 10.000 centiposes (cp) as measured by a Brookfield viscometer, e.g., operated at a shear rate of 73.4 sec "1 .
- Dispersions of particles prepared from silica gel generally have viscosities similar to the viscosities of the parent silica dispersion. For example, when parent silica gel is milled at a prescribed pH in the range of 8- 10, e.g., 9.5. the viscosity of the milled silica remains relatively unchanged. This is distinguishable from viscosities of milled precipitated silicas. The viscosities of milled precipitated silica are less than the viscosity of the parent material.
- the pH of the dispersion depends upon the inorganic oxide and additives used to stabilize the dispersion, and can be adjusted to be compatible with the other components in the formulation.
- the pH can be in the range of 2 to 11 , and all ranges in between.
- dispersions of alumina generally have a pH in the range of 2 to 6.
- Silica dispersions are generally neutral to moderately alkaline, e.g.. 7 to 1 1.
- the pH can also be modified using conventional pH modifiers.
- the dispersion With respect to a dispersion of particles comprising silica gel, the dispersion is relatively free of impurities when compared to dispersions comprising, for example, precipitated inorganic oxide particles. Parent silica gels are typically washed to remove substantially all impurities.
- the alkali salt content of gels are typically as low as 100 ppm by weight and generally no more than 0.1% based on the weight of gel.
- the low impurity levels of silica gels are especially advantageous when alkali salt would deleteriously affect the performance of the coating or the performance of the other components in the formulation.
- the pore volume of the particles can be measured on a dry basis by nitrogen porosimetry after the dispersion is dried. In general, at least about 0.5 cc/g of the particles' pore volume is from pores having a pore size of 600 A or less.
- the total pore volume of the particles as measured on a dried basis is in the range of about 0.5 to about 2.0 cc/g, with embodiments comprising silica gel having total pore volume measurements in the range of about 0.5 to about 1.5. and for certain silica gel embodiments in the range of 0.7 to about
- Measuring the pore size distribution and pore volume on a dry basis requires adjusting the pH of the dispersion of particles to about 6, slowly drying the dispersion at 105° C for sixteen hours, activating the dried dispersion at 350° C under vacuum for two hours, and then using standard BJH nitrogen porosimetry.
- the porosity of the particles can also be defined by the viscosity of the dispersion system in which the particles are added. Compared to less porous particles (at the same mass loading in a solvent), porous particles occupy a greater volume fraction of the solvent-particle system and. as such, they to a greater extent disrupt and offer greater resistance to shear flow of the fluid.
- Figure 1 shows that as loadings of particles increases, viscosity (77) increases in
- ⁇ is the volume fraction of the suspension occupied by the particles a is the "intrinsic viscosity" (equal to 2.5 for spherical, or very low aspect ratio uncharged particles) b is the volume fraction at which the viscosity becomes infinite.
- a relationship (2) also exists between ⁇ and the mass loading (x) of particles in the suspension expressed as a mass fraction solids, and the particles skeletal density (ps) and its apparent pore volume (PV ⁇ ) , referred to herein as the "viscosity derived pore volume”.
- pf is the density of the fluid phase.
- Viscosity data for a system of well dispersed particles can then be plotted
- the viscosity derived pore volume values for dispersions, especially dispersions of silica particles, are. in general, determined according to the following methodology.
- a dispersion of selected inorganic oxide is milled at one liter per minute and centrifuged for thirty minutes at 600 G or at 2.000 G.
- the pH of the dispersion is then adjusted so that a dispersion is obtained and maintained. Typically this is obtained by adjusting the pH of the dispersion away from the isoelectric point of the particles, but not into pH regimes that would cause excessive dissolution of the particles (e.g.. for silica adjust the pH to between 9.7 and 10.3 by adding NaOH).
- this pH range of optimum dispersion can be determined by titration of a 5 wt.% solids dispersion through the entire region of acceptably low particle solubility and determining the pH range associated with minimum dispersion viscosity.
- the milled dispersion from ( 1) is then adjusted to a pH in that range.
- 77 is accomplished by first estimating the slope of — (x) using a reference
- Silica dispersions of particles used in this invention show curves having an absolute slope of about 2.40 or greater, and generally in the range of 2.4 to 10.0. This data generally translates into dispersions having viscosity derived pore volumes (PVa' s) of at least about 0.5cc/g. Preferred embodiments of the formulation are prepared from particles which show a slope in the range of 3.50 - 5.0 and have a. PVa of about 1.0 to about 1.5 cc/g.
- the stability of the porosity in the particles of this invention is evidenced by calculating the loss in pore volume after a dispersion of the particles is dried. Comparing the particles' PVa and the pore volume measured after the dispersion is dried shows that at least 40% of the PVa is maintained for particles of this invention. Certain embodiments show that at least about 60% of the PVa pore volume is maintained. See Figure 3 and Example VII. Moreover, embodiments maintaining only 40% of PVa have a dried pore volume of about 0.5 cc/g or greater.
- the inorganic oxide particles can also be surface modified separately to enhance their performance in the formulation, and in particular enhance their performance in an ink receptive coating. These modifications are discussed later below.
- the binder used to prepare the formulation comprises a polymer capable of binding pigment particles.
- Film forming polymers in general are suitable.
- Particularly suitable polymers are those conventionally used to make formulations for ink receptive coatings and include any one or more combinations of polyvinyl alcohol derivatives such as completely saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, silanol group modified vinyl alcohol copolymer; cellulose derivatives such as carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, water soluble polymers such as polyvinyl pyrolidone. starch oxide, modified starch, gelatin, casein, or acrylic acid type polymers. Further. binders such as vinyl acetate and ethylene-vinyl acetate emulsions, styrene butadiene latexes, or acrylic type emulsions can also be used depending on the application.
- polyvinyl alcohol type polymers such as completely saponified polyvinyl alcohol. partially saponified polyvinyl alcohol, or silanol group modified vinyl alcohol copolymer are preferable with respect to ink absorbability and the strength of the coating.
- the formulation optionally comprises additives, depending on how the formulation is being used.
- dye mordant additives can be included to fix dyes as they are applied to the coatings.
- Optional additives also include colorants, thickeners, release agents. flow modifiers, as well as conventional pigments such as clays, fumed silicas, precipitated silica and the like. Further, a fluorescent brightening agent, a surfactant, a fungicide, crosslinkers or a dispersant can be included in the formulation as required.
- the amount of pigment to binder in the formulation varies depending on the formulations used. For applications such as ink receptive coating formulations, the weight ratio of pigment to binder in the formulation is 1 : 100 to 100: 1. The ratio depends on the application. If it is desired to prepare an ink receptive coating formulation in which PVC is less than CPVC. the pigment/binder ratio is typically about 1 : 1 to about 1 :50. If a PVC greater than CPVC is desired, the pigment/binder ratio is typically about 1 : 1 to about
- Additives typically comprise a smaller percentage of the total composition and generally are added in 1 to 30% by weight of the total formulation.
- the ingredients to the formulation are combined using conventional techniques and mixers.
- the pigment is preferably added as a dispersion, usually comprising about 1-30%. by weight solids, and added in amounts to obtain the desired pigment to binder ratio.
- the order of addition depends on the compatibility of the components. If necessary, certain ingredients can be precombined with another ingredient before all of the ingredients are finally combined together.
- the formulation is especially adaptable for preparing ink receptive coatings and can be applied to substrates used for that memepose.
- substrates include pulp-based substrates including chemical pulps such as hardwood bleached kraft pulp, softwood bleached kraft pulp, high yield pulps such as groundwood pulp or thermo-mechanical pulp, recycled pulps and non- wood pulps such as cotton pulp can be used. It is possible to mix synthetic fiber, glass fiber or the like in the pulp depending on the application.
- the substrate can also be films of vinyl, polyester, polystyrene. polyvinyl chloride, polymethyl methacrylate, cellulose acetate, polyethylene and polycarbonate.
- the substrates for ink receptive medium generally are 10- 300 microns in thickness.
- the formulation is applied to the substrate using conventional techniques, including using conventional coaters such as a blade coater.
- the recording sheet carrying a freshly applied ink receptive layer can be used as such in the ink jet recording, or after having been improved in surface smoothness by passing through the roll nip of a super calender, gloss calender, or the like under application of heat and pressure.
- the formulation is applied at an amount in the range of 2 to 50 g/m 2 and preferably 5 to 30 g/m 2 .
- the amount of formulation applied should be at least enough to provide acceptable printability and image quality.
- the formulation generally is applied to a thickness of 1-100 microns.
- the formulation is especially suitable for preparing ink receptive coatings, or ink jet paper for which relatively high gloss finishes are desired.
- the volume of the same mass of porous silica provides an additional source volume, i.e., internal pore volume.
- V porous Sll ⁇ c m*(l/p + PV)
- PV is the pore volume of the dried silica, or void space associated with the network of pores internal to the silica particles
- p is the silica skeletal density, i.e.. 2.1 g/cc.
- PV is measured by nitrogen BJH porosimetry.
- the porous inorganic oxide pigment is formulated with binders that, for the most part, do not absorb into internal void spaces, thereby making pore volume available for abso ⁇ tion of ink-fluids.
- colloidal silica does not contain this internal void space, and coatings comprising colloid become saturated with low levels of ink-liquids.
- a coating formulated with porous inorganic oxides has an additional capacity for ink fluid absorption relative to coatings formulated with prior art colloidal particles, the additional capacity being directly related to pore volume.
- ink-drytimes for coatings formulated with porous pigments are usually shorter than those coatings formulated with colloidal silica.
- the inorganic oxide pigment of the formulation also has porosity that is stable.
- the examples below illustrate that the porosity of the particles of this invention is maintained after drying. Silica gel particles show further stability as evidenced by the maintenance of porosity when the particles are formed by milling. See Examples VI and VII. Therefore, from formulation to formulation, the invention consistently contributes properties such as fast ink dry times. minimal dot gain (spreading), good image resolution, high ink loads and exceptional color gamut.
- this formulation results in high quality ink- receptive coatings that exhibit higher gloss than coatings prepared using larger size prior art pigments that are formulated above the CPVC.
- Those prior art pigments are used primarily for ink receptivity and typically do not exhibit very high gloss because the surface of the coating has a degree of roughness associated with it.
- the surface roughness is related to the particle size of the "continuous" or close-packed pigment phase. In comparison to coatings formulated with relatively large particles of porous silica, glossy coatings can still be maintained with the small, porous inorganic oxide particles of this invention because they do not create the same degree of surface roughness.
- This invention also provides acceptable ink receptivity and relatively glossy coatings at low PVC, specifically for coatings having a PVC less than
- the advantage of the fine porous particles of this invention compared to colloidal silicas in this circumstance is that they increase the capacity of the coating to absorb liquid.
- the increased capacity to absorb ink liquids is directly related to the intrinsic porosity internal to each porous particle.
- the surface of the fine particles can be modified to enhance their performance, especially in ink receptive coatings.
- the fine inorganic particles of the dispersions can be modified to create particles exhibiting positive surface charge (zeta potential).
- the surface charge should have a zeta potential of at least +20 mV. and preferably at least +40 mV.
- Ink receptive coating formulations typically have a pH in the range of 2 to 8.
- Dispersions comprising particles having a positive surface charge are more stable towards irreversible agglomeration in that pH range than are the unmodified dispersions, especially if silica is used for to prepare particles and the silica particles exhibit a negative zeta potential. Ink-receptive coatings prepared from these formulations also show better image-forming characteristics.
- the particles can be modified by additives having a cationic moiety and can be modified, for example, with alumina, organic cation-containing silanes. e.g., amine-containing silanes, and ionic polymers, e.g.. quaternary ammonium compounds such as diallyl dimethyl ammonium chloride polymer.
- the particles can be modified by introducing the modifying additive when the parent inorganic oxide is dispersed, e.g., co-milling alumina or cationic polymer with a parent silica dispersion.
- the particles can also be modified by reacting the particles with additive after the particles are made. e.g.. conducting a silanization reaction with amino silanes.
- the examples below show that irreversible agglomeration of the particles in the dispersion is reduced or eliminated when modifying the particles as described above.
- Well drained hydrogel 1 was presized by a Prater mill to a median particle size of approximately 30 ⁇ . The powder was then slurried in deionized water (DI) yielding a slurry of about 20% by weight solids and pH of about 8.
- DI deionized water
- This slurry was fed to a five (5) liter Drais media mill (model PM5RLH, 1.5mm. glass media) at a rate of one liter per minute resulting in a viscous slurry.
- Another submicron silica gel product was made using the same process as described in Example I except that the parent gel was presized in an air classification mill yielding a median silica gel particle of approximate! ⁇ 15 ⁇ The gel is partially dried during this process with its moisture content (measured as total volatiles) dropping from about 67% to 55% by weight thus forming a hydrous gel material
- Wet-milled GenesisTM gel was slurried to approximately 20% solids by weight in deionized water and the pH was adjusted to about 8. The slurry was then wet milled using a Netzsch LMZ-1 1 mill (with 0.6-0.8mm SEPR media) at 3.8 liters per minute. The milled slurry was then diluted to 14.9% solids with DI water using a Myers mixer.
- the total solids was 8.8% and the particle size distribution was:
- Syloid® 74x6500 silica xerogel was slurried in D.I. water to produce a 24%) by weight solids dispersion, and NH OH was added to adjust the pH to about 8.
- a hydrous gel having fifty-five (55) weight % total volatiles was slurried to 19% by weight solids. The pH was adjusted to 9.6 with NaOH.
- the dispersion was milled in a four liter Drais mill (1.5 mm glass beads) at a rate of 1 liter (L)/minute using six passes.
- Viscosity derived pore volumes PVa
- dried pore volumes N-, BJFI porosimetry
- particle size distribution and BET surface areas nitrogen porosimetry
- a dispersion of 21.4% solids was prepared using Syloid® 63 silica gel from Grace Davison of W. R. Grace & Co. -Conn. The pH of the dispersion was adjusted to 9.8.
- a dispersion of 8.4% solids was prepared using ZeothixTM 177 precipitated silica from Huber.
- the dispersion was then milled (using Netzsch mill), centrifuged (except only at 2000 G's for thirty minutes), measured and tested in the same manner as Sample 1. The results are reported in Table 1.
- a dispersion of 18.2% solids was prepared from GenesisTM gel from Grace Davison. The pH of the dispersion was adjusted to 9.8. The dispersion was milled in a Reitz mill (0.016 screen) for three passes and then milled eight more times in a Drais mill. Both mills were fed with inorganic oxide at one liter/minute. The milled dispersion was then centrifuged, measured and tested in the same manner as described in Sample 1. The results are reported in Table 1.
- ⁇ , 7/ (1 was determined using a Brookfield LVTD viscometer using a jacketed low viscosity cell controlled at 25.0 to 0.1 °C. at a shear rate of 73.4/sec. a 2.5 assumed for spherical particles pf 1.0 g/cc for water
- Sample 1 A Brookfield viscometer at 73.4 sec " ', viscosity (cps) was used to measure the parent dispersion, the Drais milled dispersion and centrifuged (600 G) dispersion of Sample 1 (hydrous gel) of Example V and plotted as ( ⁇ ) in — versus mass fraction solids wherein ⁇ n is the viscosity of water.
- the V data for the parent (o), milled dispersion (D), and centrifuged ( ⁇ ) dispersions is illustrated in Figure 2 A.
- the median particle size and PVa for each were 8i ⁇ and 1.34. 0.60 ⁇ and 1.33. and 0.44 ⁇ and 1.33. respectively.
- Viscosity was measured (using Brookfield at 73.4 sec " ' ) for the parent dispersion, milled dispersion and centrifuged (2000 G) dispersion of
- Viscosity was measured (using a Brookfield viscometer at 73.4 sec " ' ) for the parent dispersion, milled dispersion and centrifuged dispersion
- Figure 2A illustrates that the parent, milled and centrifuged dispersions of silica gel have about the same viscosity, and accordingly similar PVa's. This indicates that pore volume was not measurably lost when the parent silica gel dispersion was milled.
- Figures 2B and 2C show that precipitated silicas of this invention have a reduced viscosity compared to their parent at comparable loadings after milling. This is believed to be caused by destruction of pore volume.
- the N 2 BJH pore volume measured for the dispersions made in Example VI were compared and plotted against the PVa measured for those dispersions. This comparison is illustrated in Figure 3.
- the dispersions were pH adjusted to 6. dried at 105°C for about 16 hours, activated at 350°C for two hours and then measured using BJH nitrogen porosimetry.
- the dashed (-) line is a line of comparison where the BJH pore volume equals PVa. This line reflects no loss of porosity upon drying.
- the other data reflected in Figure 3 is identified in the following legend. • ID (Sample 1) o Degussa (Sample 2) ⁇ Huber Zeothix 177 (Sample 4) D Sylo ⁇ d 63 (Sample 3)
- the upper point of data is pore volume calculated Ca>, .985 P/Po and the lower point is pore volume calculated at 0.967 P/Po.
- the data for Syloid 63 silica gel (D) reflects that the inventive dispersions maintain at least 40% of PVa after drying Other silica dispersions, e g . ID gel (•), maintains at least 60% of PVa
- This data and data showing that at least 0 5 cc/g of poiosity is from pores having sizes below 600A indicates that the porosity is internal porosity which is less sub]ect to the factors that affect prior art dispersions
- the substrate was a conventional gloss white film Procedure: Coating formulations were prepared at constant solids content and silica/binder ratio, so that the effect of silica particle size on film gloss could be determined.
- the silicas were mixed into the latex, and this formulation was coated onto the white film using a K Control Coater and a #6 rod.
- the wet coatings were dried using a heat gun, and then were heated in an oven at 80°C for 5 minutes.
- Gloss measurements were made using a Byk- Garner Gloss Meter on the coated sheets at 20°. 60° and 85° from normal. High values correspond to high gloss. Results are given in table below.
- Coating formulations were prepared at constant solids and constant silica/binder ratio, so that the effect of silica porosity on ink dry-time could be measured.
- the formulation used for comparison was 100 parts silica, 30 parts poly(vinylalcohol) [Air Products Airvol 823] and 15 parts poly(diallyl dimethyl ammonium chloride) dye mordant [Calgon CP261LV], Silica dispersions having 17.4% solids were prepared, and then charged to a mixer, and the pH was lowered with the addition of 1.0 M HCl to 2.8-3.3. The Airvol 823 was then added, and the silica/PVOH mixture was stirred for 1 -2 min.
- the CP261 LV mordant after dilution with water, was added dropwise with vigorous stirring. The final pH was adjusted to between 2.8 and 3.5.
- the formulation was coated onto a film substrate (1CI Melinix #454) using a K Control Coater and a #8 rod. The wet coatings were dried using a heat gun. and then were heated in an oven at 80° C for 5 min. Visual examination of the films demonstrated that they were free from large-scale defects.
- the film was dry between 2 and 4 minutes for the porous silica coatings, but took longer to dry for the nonporous silica coating.
- Example IX The same silicas used in Example IX were used in this Example.
- Coating formulations were prepared at constant solids and constant silica/binder ratio, so that the effect of silica porosity on ink dry-time could be measured.
- the formulation used for comparison was 69 parts silica. 21 parts poly(vinylalcohol) [Air Products Airvol 325] and 10 parts poly(ethyleneimine) dye mordant [BASF Lupasol G35].
- the silica dispersions of 17.4% solids were prepared for each sample and then charged to a mixer, and the pH was lowered with the addition of 1.0 M HCl to 2.8-3.3.
- the Airvol 325 was then added, and the silica/PVOH mixture was stirred for 1 -2 min.
- the Lupasol G35 mordant after dilution with water, was added dropwise with vigorous stirring. The final pH was adjusted to between 2.8 and 3.5.
- the formulation was coated onto a film substrate (ICI Melinix #454) using a K Control Coater and a #8 rod.
- the wet coatings were dried using a heat gun. and then were heated in an oven at 80° C for 5 min. Visual examination of the films demonstrated that they were free from large-scale defects.
- the film was dry between 4 and 6 minutes for the porous silica coatings, but took longer to dry for the nonporous silica coating.
- Formulations comprising milled W500, and milled and centrifuged
- Example IX W500 described in Example IX are made at 80 parts pigment and 20 parts binder, and applied to a vinyl substrate and allowed to dry under the conditions described in Example IX.
- the coating is removed from the substrate and measured for porosity using BJH nitrogen porosimetry.
- the pore volume measurements show that such coatings have an ink capacity of 10.2 cc per 10 grams of coating.
- Other coatings can be prepared to have ink capacities in the range of 3 to 50 cc per 10 grams of coating, and all other ranges in between.
- a formulation and coating is similarly made with the Nalco colloidal material described in Example IX.
- the coating is dried, removed from the substrate and porosity for that coating is measured.
- Such coating has an ink capacity of 2.2 cc per 10 grams and generally such coatings have a capacity of less than 3 cc per 10 grams.
- a dispersion of 18% solids was prepared as follows.
- D 5 Dermata 440SX electrophoretic mobility analyzer.
- the sample was allowed to sit for one month and then redispersed by mixing at 2000 RPM for 2 min. using a 60 mm dia. Cowles blade in a 1 18 mm diameter container, and the particle size was again measured to be
- the particles are thus relatively stable towards irreversible agglomeration at this pH as evidenced by the nearly constant D I values.
- Aminopropyltriethoxysilane (Dow Corning Z-601 1 ) were added. This silane solution was added to the above porous silica gel slurry. The product pH was 2.8-4.5. and the particle size measured immediately after preparation was:
- the zeta potential for the treated sample was determined to be about +40 mV.
- the particles are thus relatively stable towards irreversible agglomeration at this pH as evidenced by the nearly constant D () values.
- the untreated sample irreversibly agglomerates to a gel like mass whereas the silane treated example shows particle size distribution similar to the fresh prepared samples.
- the pH of the mixture was readjusted to 2.8-3.5 with 1.0 N hydrochloric acid.
- a solution containing 3.75 g of 261 ® LV (40 wt. %; Calgon Corp.) diluted with D. I. water (6.0g) was added to the above mixture.
- the final pH of the coating formulation was 2.8-3.5.
- PET transparent films were coated via depositing a 100 ⁇ wet film. After drying the resulting coating has a smooth, glossy appearance with very good printability using dye or pigmented inks.
- Example 3 By comparison to Example 3, if an ink jet formulation is made in a similar fashion as above without the addition of 3-aminopropyltriethoxysilane, agglomeration of silica occurs resulting in a gel like formulation that breaks down only under very high sheer yielding a gritty coating.
- a dispersion of 16% solids was prepared as follows.
- the particles are thus relatively stable towards irreversible agglomeration and this pH as evidenced by the nearly constant particle size values.
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Abstract
Description
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Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
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EA200100122A EA003067B1 (en) | 1998-07-09 | 1999-06-22 | Formulation suitable for ink receptive coatings |
UA2001020871A UA73280C2 (en) | 1998-07-09 | 1999-06-22 | Formulation for ink receptive coatings |
IL14076399A IL140763A0 (en) | 1998-07-09 | 1999-06-22 | Formulation suitable for ink receptive coatings |
AU45798/99A AU769380B2 (en) | 1998-07-09 | 1999-06-22 | Formulation suitable for ink receptive coatings |
KR1020017000360A KR20010074689A (en) | 1998-07-09 | 1999-06-22 | Formulation suitable for ink receptive coatings |
BR9911918A BR9911918A (en) | 1998-07-09 | 1999-06-22 | Formulation suitable for coatings that receive paint |
CA 2337193 CA2337193A1 (en) | 1998-07-09 | 1999-06-22 | Formulation suitable for ink receptive coatings |
PL34804499A PL348044A1 (en) | 1998-07-09 | 1999-06-22 | Formulation suitable for ink receptive coatings |
JP2000558981A JP2002520424A (en) | 1998-07-09 | 1999-06-22 | Formulations suitable for ink-receptive coatings |
EP99928814A EP1094953A1 (en) | 1998-07-09 | 1999-06-22 | Formulation suitable for ink receptive coatings |
NO20010125A NO20010125L (en) | 1998-07-09 | 2001-01-08 | Mixture suitable for ink-receiving coatings |
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US09/112,540 | 1998-07-09 | ||
US09/112,540 US6841609B2 (en) | 1998-07-09 | 1998-07-09 | Formulation suitable for ink receptive coatings |
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US (3) | US6841609B2 (en) |
EP (1) | EP1094953A1 (en) |
JP (1) | JP2002520424A (en) |
KR (1) | KR20010074689A (en) |
CN (1) | CN1196599C (en) |
AR (1) | AR019756A1 (en) |
AU (1) | AU769380B2 (en) |
BR (1) | BR9911918A (en) |
CA (1) | CA2337193A1 (en) |
CZ (1) | CZ2001109A3 (en) |
EA (1) | EA003067B1 (en) |
ID (1) | ID23474A (en) |
IL (1) | IL140763A0 (en) |
NO (1) | NO20010125L (en) |
PL (1) | PL348044A1 (en) |
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TW (1) | TW467832B (en) |
UA (1) | UA73280C2 (en) |
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EP1075961A2 (en) * | 1999-08-10 | 2001-02-14 | Felix Schoeller Technical Papers, Inc. | Inkjet recording paper with improved gloss and drying properties |
EP1075961A3 (en) * | 1999-08-10 | 2003-01-08 | Felix Schoeller Technical Papers, Inc. | Inkjet recording paper with improved gloss and drying properties |
EP1245624A1 (en) * | 2001-03-30 | 2002-10-02 | Lintec Corporation | Composition for forming receiving layer and recording sheet for inkjet printing |
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US8142843B2 (en) | 2007-03-16 | 2012-03-27 | Cabot Corporation | Aerogel particles and methods of making same |
US11072691B2 (en) | 2015-09-29 | 2021-07-27 | Nitto Denko Corporation | Method for producing porous gel-containing liquid, porous gel-containing liquid, method for producing high-void layer, method for producing high-void porous body, and method for producing laminated film roll |
WO2017065641A3 (en) * | 2015-10-12 | 2017-07-06 | федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский национальный исследовательский университет информационных технологий, механики и оптики" (Университет ИТМО) | Method for color interference inkjet printing |
Also Published As
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US7393571B2 (en) | 2008-07-01 |
ZA200101006B (en) | 2001-05-16 |
US20040241425A1 (en) | 2004-12-02 |
US6780920B2 (en) | 2004-08-24 |
EA200100122A1 (en) | 2001-08-27 |
CZ2001109A3 (en) | 2001-09-12 |
CN1328504A (en) | 2001-12-26 |
US6841609B2 (en) | 2005-01-11 |
AU769380B2 (en) | 2004-01-22 |
CA2337193A1 (en) | 2000-01-20 |
NO20010125D0 (en) | 2001-01-08 |
JP2002520424A (en) | 2002-07-09 |
EA003067B1 (en) | 2002-12-26 |
KR20010074689A (en) | 2001-08-09 |
IL140763A0 (en) | 2002-02-10 |
BR9911918A (en) | 2001-12-11 |
TR200100017T2 (en) | 2001-07-23 |
AU4579899A (en) | 2000-02-01 |
NO20010125L (en) | 2001-03-08 |
AR019756A1 (en) | 2002-03-13 |
US20030191226A1 (en) | 2003-10-09 |
PL348044A1 (en) | 2002-05-06 |
US20030181566A1 (en) | 2003-09-25 |
UA73280C2 (en) | 2005-07-15 |
ID23474A (en) | 2000-04-27 |
EP1094953A1 (en) | 2001-05-02 |
CN1196599C (en) | 2005-04-13 |
TW467832B (en) | 2001-12-11 |
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