DE4028346A1 - MULTILAYER CORRECTIVE MATERIAL, METHOD FOR THE PRODUCTION THEREOF AND USE - Google Patents

Abstract

A multilayer correcting material with a silicone-treated base, in particular designed as a tape, has a covering layer provided for correction purposes arranged on the base and an adhesive layer arranged on the covering layer. The correcting material is produced by forming the covering layer on the base by means of a water-based coating substance which contains an emulsifier, a polyethylene wax dispersion, a polyacrylate dispersion, a fluorinated tenside, a padding agent, fillers and white pigments, if necessary an anti-foaming agent and a preservative. The water is evaporated. On the dried covering layer an overcoat is applied, exclusively containing water as dispersing agent and a polyethylene wax dispersion, an anionic polyacryl dispersion and if necessary another emulsifier, anti-foaming agent and preservative. The water it contains is then evaporated.

Description

The invention relates to a multilayer correction material with a siliconised carrier, in particular in tape form, and of it, intended for correction purposes Covering layer and one arranged on the cover layer Adhesive layer, in which the adhesion between the cover layer and Adhesive layer stronger than the carrier. Furthermore, the Invention nor the production of such a correction material and the use of the same.

To cover erroneous written representations, eg. B. in Typewriter texts, so far one has to a large extent white pigmented systems containing organic matter Solvent applied to the areas to be improved. However, the evaporation of these solvents brings one some burden on the environment; in addition, because of the volatility of the solvents in the im Reservoir still existing covering the viscosity increases, with the result that the course is not so cheap is and from time to time solvent in the reservoir must be given. In addition, you already have erroneous representations by gluing a Correction material covered; this material is to be such, in which to a suitable carrier a Cover layer and then applied to this an adhesive layer is. In application, the adhesive layer is on the faulty appearance on and the cover layer shows through Deduction of the carrier to the outside. Such a material is z. B. from DE 37 41 022 C2, according to which the on Solvent based covering mass for later Improvement of the demolition nor cellulose derivatives, such as methyl or ethylcellulose.

In contrast, it has now been found that even without the use of organic solvents and the concomitant use of Tear-promoting cellulose derivatives to a multilayered Correction material can get through, by the particular Structure of the cover layer forming coating agent and the Coordination with the responsible for the liability Overcoat coating. Since in both cases only water exists as a distribution medium, is also in the Making the correction material does not pose the risk of Freeing up solvents and polluting the environment.

In the case of the covering layer, it is important that in the For example, the fluorochemical surfactant used is a fluorinated surfactant of the type of potassium fluoroalkyl carboxylates and a dispersion of Polyethylene wax is present. In the adhesive layer is also a Polyethylene wax present; it gets along with a anionic acrylic dispersion in the associated application agent brought in.

As carriers for the claimed correction materials come both sides siliconized papers or plastics, such as Polyethylene, polyethylene terephthalate, etc. in question.

Insofar as the correction material contains incorrect representations, z. B. in the office area, contains the cover layer preferably suitable white pigments, in particular titanium dioxide. Be in the relevant for the covering layer coating composition also amines, emulsifiers, matting agents, fillers, a polyacrylate and possibly even defoamer and Preservatives used. As a fluorinated surfactant, the for a successful application of the aqueous coating composition on the carrier is essential, z. B. The commercial products are used with the terms "Fluorad FC 129, FC 430, FC 807 and FC 808" (from the Fa. 3M-Chemie), "Fluorosurfactant FT 448, FT 488, FT 718, FT 719 and FT 929 "(from Bayer AG) and" Schwego Fluor 8035 and  8036 "(from the company Schwegmann) .The emulsifier is preferably a wetting lecithin derivative based on natural Phosphoamino compounds used with 100% active substance. When Polyacrylate comes an aqueous dispersion of a carboxyl-containing acrylic acid ester copolymers into consideration. As a defoamer is a silicone-free or silicone-containing Defoamer suitable; suitable products are z. Dapro 880 (from the company Krahn Chemie). Tego Foamex 7447 (from the company Tego Chemistry) or Baysilone AC 3138/3189 (from Bayer AG). As a preservative in particular a biocide used, based on synergistic combination of cyclic halogenated compound is based, so free from Heavy metals / phenols as well as formaldehyde is and approval from FDA as well as BGA. To vote on "paper white" you can add a carbon black pigment.

For those also in the form of an aqueous distribution present overcoat mass is the presence of a Polyethylenwachsdisperison essential for the achievement of desired liability. In addition, the mass contains one more smaller amount of anionic acrylic polymer dispersion (Particle size less than 1 micron). Emulsifier, defoamer and Biocide correspond to those for the cover layer.

The application of covering compound and overcoat is expedient by means of a squeegee, wherein after each job the layer is dried, for. B. by passing through a Drying tunnel.

The course of applied agents on the carrier is very good, the adhesion also meets all requirements.

Example 1

On a paper siliconized on both sides by means of a Rakels (distance 80 microns) a white covering compound with water as Spreading medium applied. By passing a  Drying channels (temperature 80 to 90 ° C) becomes the volatile Water content evaporated. The covering compound had the following weight percent composition on:

water 30.0% 3- (diamino) 1-propanol 1.7% lecithin derivative 1.7% Polyethylene hard wax dispersion (melting point of the wax 100 ° C, density 1.00, TS-Geh. 34, 36%) 9.0% Matting agent (of the type silicon / magnesium oxide, talcum / magnesite base 3.0% acid-activated aluminum hydroxide as filler (bulk density 200 kg / m³) 6.0% Calcium carbonate (density 2.7 g / cm³) 9.0% Titanium dioxide (stabilized with Al and Si, Ti content 95%, density 4.4 g / cm³, type R2 according to DIN 55 912) 9.0% Titanium dioxide (stabilized with Al and Si, Ti content 85%, density 3.7 g / cm³, type R3 according to DIN 55 912) 23.3% carboxyl group-containing acrylic acid ester copolymer in aqueous dispersion (TS content 69%, density 1.01 g / cm 3) 6.0% Defoamer (density 0.867 g / cm³, boiling range 119 ° C) 0.295% Biocide (based on cyclic halogen compound) 0.1% Kaliumfluoralkylcarboxylat 0.9

On the produced with the aforementioned coating composition and dried white coating is also made by means of a Doctor blade (distance 30 μm) an overcoat on an aqueous basis applied, which then also by passing a Drying channels (temperature 80 to 90 ° C) is dried. That so product obtained was cut into ribbon and can then in rolled form in commercial application equipment, such as be installed a hand roller.  

The aqueous overcoat coating composition had the following Weight percentage composition:

example 2 (especially good overwritability)

On a paper siliconized on both sides by means of a Rakels (distance 80 microns) a white covering compound with water as Spreading medium applied. By passing a Drying channels (temperature 80 to 90 ° C) becomes the volatile Water content evaporated. The covering compound had the following Weight percent composition on:

water 25.104% 3- (Diaminol) 1-propanol 1.3% lecithin derivative 2.0% Polyethylenhartwachsdispersion (melting point of the wax 145 ° C, density 0.99, TS-Geh. 34, 36%) 7.7% Matting agent (of the type silicon / magnesium oxide, talc / magnesite-based) 4.0% acid-activated aluminum hydroxide as filler (bulk density 200 kg / m³) 6.5% Calcium carbonate (density 2.7 g / cm³) 10.0% Titanium dioxide (stabilized with Al and Si, Ti content 95%, density 4.4 g / cm³, type R2 according to DIN 55 912) 10.0% Titanium dioxide (stabilized with Al and Si, Ti content 85%, density 3.7 g / cm³, type R3 according to DIN 55 912) 25.5% carbon black pigment 0.006% carboxyl group-containing acrylic acid ester copolymer in aqueous dispersion (TS-Go. 69%, density 1.01 g / cm³ 6.5% Defoamer (density 0.867 g / cm³, boiling range 119 ° C) 0.3% Biocide (based on cyclic halogenated compound 0.13% Kaliumfluoralkylcarboxylat 0.96%

On the produced with the aforementioned coating composition and dried white coating is also made by means of a Rakels (distance 30 microns) an overcoat on an aqueous basis applied, which then also by passing a Drying channels (temperature 80 to 90 ° C) is dried. That so product obtained was cut into ribbon and can then in rolled form in commercial application equipment, such as be installed a hand roller.

The aqueous overcoat coating composition had the following Weight percentage composition:

water 62.5% Polyethylene hard wax dispersion (TS content 45%, melting point 145 ° C.) 24.5% Defoamer (density 0.867 g / cm³, boiling range 119 ° C) 0.25% Biocide, as above 0.25% anionic polyacrylic dispersion (DS content 50%, particle size less than 1 μm, density 1.02 g / cm³ 12.5%

Claims (7)

1. Multilayer correction material with a siliconized Carrier, especially in ribbon form, and one on it located, intended for correction purposes covering layer and an adhesive layer disposed on the cover layer, in which the adhesion between the cover layer and the adhesive layer stronger than the carrier is available by forming the cover layer on the support by means of a Water-based coating composition containing an emulsifier, a Polyethylene wax dispersion, a polyacrylate dispersion, a fluorinated surfactant, matting agents, fillers and White pigments as well as if necessary. a defoamer and a Contains preservative, and evaporation of the water and further order of an overcoat coating on the dried cover layer by means of a likewise water as sole distribution medium containing coating agent with a content of a polyethylene wax dispersion, a anionic polyacrylic dispersion and if necessary. one more Emulsifier, a defoamer and a preservative with subsequent evaporation of the water.   2. A process for the production of a multilayer correction material, formed from a siliconized support, in particular in tape form, on the support resting, intended for correction purposes cover layer and an adhesive layer, wherein the adhesion between the cover layer and adhesive layer is stronger than that to the carrier, characterized that

• a) in the preparation of the cover layer on the support, a water-based coating agent is applied, which comprises an alkanolamine, an emulsifier, a polyethylene wax dispersion, a polyacrylate, a fluorinated surfactant, matting agents, fillers and white pigments and ggfls. contains a defoamer and a preservative, and after the coating, a evaporation of the water content takes place, and
• b) on the dried cover layer, an overcoat coating is carried out with an agent in which water is also present as the sole distribution medium and the still a polyethylene wax dispersion, an anionic polyacrylic dispersion and if necessary. an emulsifier, a defoamer and a preservative, and then the water is made to evaporate.

3. The method according to claim 2, characterized, that for obtaining the cover layer, a coating agent with the weight percent composition: 30.0% of water, 1.7% of 3- (diaminol) 1-propanol, 1.7% of emulsifier Lecithin base, 9.0% of a dispersion of a Polyethylene hard wax (melting point of 100 ° C), 3.0% silicon-magnesium oxide, 6.0% acid-active. Aluminum hydroxide (bulk density 200 kg / m³), 9.0% calcium carbonate (density 2.7 g / cm³), 9.0% titanium dioxide (stabilized with Al and Si, Ti-Geh. 95%, density 4.4 g / cm³, type R2 after DIN 55 912), 23.3% titanium dioxide (stabilized with Al and Si,  Ti-go. 85%, density 3.7 g / cm³, type R3 according to DIN 55 912), 0.005% carbon black pigment, 6.0% of a dispersion of a carboxyl-containing acrylic acid ester copolymer (TS-Geh. 69%, density 1.01 g / cm³, 0.295% of a defoamer, 0.10% preservative, 0.9% potassium fluoroalkyl carboxylate is applied and to obtain the adhesive layer, a coating agent with the Weight percent composition: 62.8% water, 4.8% lecithin based emulsifier, 20.7% one Dispersion of a soft polyethylene wax (TS-Geh. 25%), 3.5% a polyethylene wax primary dispersion (TS-Geh. 40%), 0.9% defoamer, 0.3% preservative, 7.0% one anionic acrylic polymer dispersion (TS-Geh. 50%, Particle size less than 1 micron, density 1.02 g / cm³) is applied. 4. The method according to claim 2, characterized in that to obtain the cover layer, a coating agent with the weight percent composition:
25.104% water, 1.3% 3- (diamino) 1-propanol, 2.0% lecithin-based emulsifier, 7.7% of a 34, 36% dispersion of a polyethylene hard wax (density 0.99 and melting point of 145 ° C.) , 4.0% silicon-magnesia, 6.5% acid-active. Aluminum hydroxide (bulk density 200 kg / m3), 10% calcium carbonate (density 2.7 g / cm3), 10.0% titanium dioxide (stabilized with Al and Si, Ti content 95%, density 4.4 g / cm3, type R2 according to DIN 55 912), 25.5% titanium dioxide (stabilized with Al and Si, Ti content 85%, density 3.7 g / cm3, type R3 according to DIN 55 912), 0.006% carbon black pigment, 6.5% a dispersion of a carboxyl group-containing acrylic acid ester copolymer (TS-Geh. 69%, density 1.01 g / cm³, 0.300% of a defoamer, 0.13% preservative, 0.96% potassium fluoroalkyl carboxylate is applied
and, to obtain the adhesive layer, a coating composition having the weight percent composition:
62.5% water, 24.5% of a dispersion of a polyethylene hard wax (TS content 45%, melting point 145 ° C.), 0.25% defoamer, 0.25% preservative, 12.5% of an anionic acrylic polymer dispersion (TS) Go. 50%, particle size less than 1 micron, density 1.02 g / cm³) is applied. 5. The method according to claim 3 or 4, characterized, that used as a carrier siliconized papers or films become. 6. The method according to claim 3, 4 or 5, characterized, that the coatings take place by means of a doctor blade and the Water in each case by passing the coated Carrier through a drying tunnel at 80 to 90 ° C evaporated becomes. 7. Use of by applying aqueous systems according to The correction material obtained from the preceding claims to cover written representations by removing the Beam, including the material after cutting and reeling sometimes. is used in a hand-held device.