EP0003568A1 - Composition comprising optical brightening agents for use in the whitening of paper coating compositions - Google Patents

Abstract

1. Single-phase liquid formulation of optical brighteners for whitening paper-coating compositions based on synthetic and, optionally, naturally occurring binders, containing a disperse brightener and an organic liquid which has a boiling point above 150 degrees C and is not completely water-miscible, as well as, optionally, anionic brighteners and organic, watersoluble auxilaries, characterized in that this formulation contains 5-30 % by weight of water and 20-80 % by weight of an emulsifier as the solubilising agent.

Description

The invention relates to a preparation of optical brighteners for whitening coatings, characterized by the solution of whites in a single-phase system containing water, organic liquids boiling above 150 ° C. which are not completely miscible with water, and a solubilizer.

The invention further relates to a method for whitening coatings, characterized in that the coating compositions solutions of whites in the above. single-phase system can be added.

Coatings for the production of smooth surfaces, such as paper or cardboard, contain binders of various chemical compositions. These coatings are lightened with white tones to improve their aspect. When using natural binders such as casein, starch, protein or gelatin, very good results are achieved with anionic whiteners from the triazinylflavonic acid series. This class of substances fails in the case of artificial binders. If whiteners of the TriazinylflavonsQure series are used in the presence of surfactants (GB-PS 1 294 173) or amide-formaldehyde resins (DT-OS 2 229 872), brightenings are obtained, but their whiteness does not meet the requirements. The whiteness level is not significantly improved even if, instead of the water-soluble triazinylflavonic acid derivatives, dispersion whitening agents are used and a lightening from the dispersion is attempted. Moreover, these proposals are limited to synthetic latices as the only binders and cannot be used for the technically important mixtures of natural and synthetic binders.

Another proposal (DT-OS 2 242 597) is to dissolve dispersion whitening agents in a colorless organic liquid which is immiscible with water, whose boiling point is above 150 ° C and in which the whitening agent has a minimum solubility of 0 at room temperature , 3 g / 1, and add these solutions, which may also contain an emulsifier, to the coating slips. Although good white effects are obtained with this method, no homogeneous mixture occurs between the aqueous latex and the white toner solution, so that the use of the process leads to uneven brightening.

This disadvantage could now surprisingly be eliminated by dissolving dispersion whitening agents in a single-phase system which contains water, organic liquids boiling above 150 ° C., which are not completely miscible with water, and a solubilizer, and adding this preparation to the coating composition.

A further, previously unknown, advantageous property of this preparation is that the system according to the invention is able to absorb anionic brighteners in addition to dispersion whitening agents.

With the preparations according to the invention, it is possible to lighten both coatings which only contain artificial binders and coatings which contain both artificial and natural binders.

Organic liquids boiling above 150 ° C. and not completely miscible with water are, for example, high-boiling ethers such as dibenzyl ether, diphenyl ether and 1-methoxymethylnaphthalene; Acetals such as diphenoxyethyl formal; chlorinated hydrocarbons such as chlorinated paraffins with a chlorine content of 10 to 80, preferably 40 to 50%; Alkylbenzenes such as dodecylbenzene; Esters of organic and inorganic acids, for example phosphoric acid esters such as diphenyloctyl phosphate, chloroethyl phosphate and trioctyl phosphate; Monocarboxylic acid esters such as methyl oleic acid; Oxicarboxylic acid esters such as acetyl (2-ethylhexyl) citrate, acetyl tri-n-butyl citrate, castor oil, salicylic acid or methyl cresotate, aryl alkanesulfonate such as phenyl dodecanesulfonate or tetradecanesulfonate; epoxidized fatty acids such as epoxidized soybean oil or epoxidized linseed oil and polymeric esters such as adipic acid polyglycol ester or phthalic acid-polyethylene glycol ester.

Phosphoric acid esters such as triethyl phosphate, trioctyl phosphate, tricresyl phosphate and trichloroethyl phosphate have proven particularly useful.

Non-ionic and anionic emulsifiers can be used as solubilizers. Examples of the former emulsifiers are: esters and ethers of polyalcohols such as alkyl polyglycol ethers, e.g. of lauryl alcohol or oley alcohol, poly ethylene glycol ether, acyl polyglycol ether such as oleic acid polyglycol ether, alkylaryl polyglycol ether such as the ethoxylation products of nonyl and dodecylphenol, acylated amino-alkanol polyglycol ether, furthermore non-ionogenic surfactants such as fatty amines or derivatives of fatty amines, which are derived from fatty amine derivatives of fatty amines, such as fatty amines, derived from fatty amine derivatives such as fatty amines, derived from fatty amine derivatives such as fatty amines, derived from fatty amines.

• a) Carbonsäuren und ihre Salze, wie die Na-, K- oder NH₄-Salze der Laurin-, Stearin- oder ölsäure, Acylierungsprodukte von Aminocarbonsäuren und ihre Salze, z.B. das Natriumsalz des Oleyl-sarkosids.
• b) Sulfate wie Fettalkoholsulfate, z.B. Laurylsulfat und Lorolsulfat, Sulfate von Hydroxyfettsäureestern,z.B. sulfatiertes Ricinusöl, von Fettsäurehydroxyalkylamiden, z.B. sulfatiertes Kokosfettsäureäthanolamid sowie Sulfate von partiell veresterten bzw. verätherten Polyhydroxyverbindungen, wie sulfatiertes ölsäuremonoglycerid oder Glycerinäthersulfate, ferner Sulfate substituierter Polyglykoläther, z.B. Nonylphenylpolyglykoläthersulfat.
• c) Sulfonate wie primäre und sekundäre Alkylsulfonate, z.B. C₁₂-C₁₆-Paraffinsulfonsäuren bzw. deren Natriumsalze, Alkylsulfonate mit amid- oder mit esterartig gebundenen Acylresten wie Oleyl-methyl-taurid und Sulfonate von Polycarbonsäureestern wie Di-iso-octylsulfatobernsteinsäureester; ferner solche mit aromatischen Gruppen wie Alkylbenzol-, z.B. Dodecylbenzol-, Alkylnaphthalin-, wie Dibutylnaphthalin und Alkylbenzimidazol-, wie Tetradecylbenzimidazol-Sulfonate.

Examples of anionic solubilizers are:

• a) Carboxylic acids and their salts, such as the Na, K or NH ₄ salts of lauric, stearic or oleic acid, acylation products of aminocarboxylic acids and their salts, for example the sodium salt of the oleyl sarcoside.
• b) sulfates such as fatty alcohol sulfates, for example lauryl sulfate and lorolsulfate, sulfates of hydroxy fatty acid esters, for example sulfated castor oil, of fatty acid hydroxyalkylamides, for example sulfated coconut fatty acid ethanol amide, and sulfates of partially esterified or etherified polyhydroxy compounds, such as sulfated oleic acid glycolate glyphyl ether sulfate, sulfate glyceryl ether sulfate,
• c) sulfonates such as primary and secondary alkyl sulfonates, for example C ₁₂ -C ₁₆ paraffinsulfonic acids or their sodium salts, alkyl sulfonates with amide- or with ester-like acyl residues such as oleyl methyl tauride and sulfonates of polycarboxylic esters such as di-iso-octyl sulfate succinic acid esters; also those with aromatic groups such as alkylbenzene, for example dodecylbenzene, alkylnaphthalene, such as dibutylnaphthalene and alkylbenzimidazole, such as tetradecylbenzimidazole sulfonates.

Furthermore, the system can additionally contain solubility-improving substances such as caprolactam, dimethylformamide, N-methylpyrrolidone or associates from caprolactam on the one hand and alcohols and amines such as methanol, ethanol, ethyl-ethylene glycol, aminoethanol, diethylene diamine or triethylene glycol on the other hand. These substances can also take on the role of non-ionic solubilizers.

• Naphthalsäureimid-Derivate, wie 4-Methoxy-N-methylnaphthalsäureimid oder 4-[3-Methylpyrazolyl-(1)]-N-äthylnaphthal- imid;
• Styryl-triazolderivate, wie 2-Styryl-naphthotriazol, 2-Styryl-5-[5-methyl-6-butoxy-benztriazolyl-(1)]-benztriazol oder 2-[4-Phenylstyryl]-5-methoxybenztriazol;
• Distyryl-Derivate, wie 1,4-Bis-(2-cyanstyryl)-benzol;
• Pyrazolochinolin-Derivate, wie 1,3-Dimethyl-4-chlorpyrazo- lo (3,4-b)-chinolin;
• Pyren-Derivate, wie 2,4-Dimethoxytriazinyl-(6)-pyren;
• Benzoxazol-Derivate, wie 1,2-Bis-[5-methylbenzoxyzolyl-(2)]-äthylen, 5-tert.-Butyl-2-(diphenylstyryl)-phenyl-benzoxazol, 4,4'-Bis-[5-phenyloxazolyl-(1)]-diphenyl oder 2,5-Bis-[benz- oxazolyl-(2)]-thiophen;
• Pyrazolin-Derivate, wie 1-(4-Aminosulfonylphenyl)-3-(4- chlorphenyl)-pyrazolin, 1-(4-Methylsulfonphenyl)-3-(4- chlorphenyl)-pyrazolin oder 1- f2-L3-Dimethylaminopropyl-(2)-oxy]-sulfonyl} -3-(4-chlorphenyl)-pyrazolin;
• Cumarin-Derivate, wie
• 3-Phenyl-7[6-chlor-4-diäthylamino-triazinyl-(2)]-aminocumarin;
• 3-Phenyl-7-äthylcarbamoylcumarin;
• 3-[4-Chlorpyrazolyl-(1)]-7-[4-methyl-5-phenyl-triazolyl-(2)]-cumarin oder
• 3-Phenyl-7-[4-methyl-5-phenyl-triazolyl-(2)]-cumarin.
• Besonders geeignet sind Carbostyril-Derivate, wie 3-Phenyl-7-dimethylamino-N-äthyl-carbostyril.
• Anionaktive Weißtöner sind beispielsweise Verbindungen aus der Reihe der Triazinylflavonsäure, wie
• 4,4'-[6-Amino-4-anilino-triazinyl-(2)]-diaminostilben-2,2'- disulfonsäure;
• 4,4'-[6-Methylamino-4-anilino-triazinyl-(2)]-diaminostilben-2,2'-disulfonsäure;
• 4,4'-[6-Diäthanolamino-4-(4-sulfophenyl)-amino-triazinyl-(2)]-diaminostilben-2,2'-disulfonsäure oder
• heterocyclische substituierte Stilbenaulfonsäuren wie 4,4'-[4-Phenyl-1.2.3-triazolyl-(2)]-diamino-stilben-2,2'- disulfonsäure oder Derivate des Diphenyl wie 4,4'-[1-(2-sulfonato-phenyl)-äthyliden-(217-biphenyl.

White toners are understood to be dispersion white toners and anion-active white toners. Dispersion whiteners are water-insoluble or sparingly soluble in water. The following classes are possible:

• Naphthalimide derivatives such as 4-methoxy-N-methylnaphthalimide or 4- [3-methylpyrazolyl- (1)] - N-ethylnaphthalimide;
• Styryl-triazole derivatives such as 2-styryl-naphthotriazole, 2-styryl-5- [5-methyl-6-butoxy-benzotriazolyl- (1)] benzotriazole or 2- [4-phenylstyryl] -5-methoxybenztriazole;
• Distyryl derivatives such as 1,4-bis (2-cyanstyryl) benzene;
• Pyrazoloquinoline derivatives such as 1,3-dimethyl-4-chloropyrazo-lo (3,4-b) quinoline;
• Pyrene derivatives such as 2,4-dimethoxytriazinyl- (6) pyrene;
• Benzoxazole derivatives, such as 1,2-bis- [5-methylbenzoxyzolyl- (2)] - ethylene, 5-tert-butyl-2- (diphenylstyryl) -phenyl-benzoxazole, 4,4'-bis- [5-phenyloxazolyl- (1)] diphenyl or 2,5-bis- [benzoxazolyl- (2)] thiophene;
• Pyrazoline derivatives, such as 1- (4-aminosulfonylphenyl) -3- (4-chlorophenyl) pyrazoline, 1- (4-methylsulfonphenyl) -3- (4-chlorophenyl) pyrazoline or 1- f2-L3-dimethylaminopropyl- ( 2) -oxy] -sulfonyl} -3- (4-chlorophenyl) pyrazoline;
• Coumarin derivatives, such as
• 3-phenyl-7 [6-chloro-4-diethylamino-triazinyl- (2)] aminocoumarin;
• 3-phenyl-7-ethylcarbamoylcoumarin;
• 3- [4-chloropyrazolyl- (1)] - 7- [4-methyl-5-phenyl-triazolyl- (2)] - coumarin or
• 3-phenyl-7- [4-methyl-5-phenyl-triazolyl- (2)] coumarin.
• Carbostyril derivatives such as 3-phenyl-7-dimethylamino-N-ethyl-carbostyril are particularly suitable.
• Anionic white toners are, for example, compounds from the series of triazinylflavonic acid, such as
• 4,4 '- [6-amino-4-anilino-triazinyl- (2)] - diaminostilbene-2,2'-disulfonic acid;
• 4,4 '- [6-methylamino-4-anilino-triazinyl- (2)] - diaminostilbene-2,2'-disulfonic acid;
• 4,4 '- [6-diethanolamino-4- (4-sulfophenyl) amino-triazinyl- (2)] - diaminostilbene-2,2'-disulfonic acid or
• heterocyclic substituted stilbena sulfonic acids such as 4,4 '- [4-phenyl-1,2.3-triazolyl- (2)] - diamino-stilbene-2,2'-disulfonic acid or derivatives of diphenyl such as 4,4' - [1- (2 -sulfonatophenyl) ethylidene- (217-biphenyl.

The preparation according to the invention and the method according to the invention are suitable for whitening the coating slips usually used in the paper industry, specifically for whitening unpigmented, but in particular pigmented coating slips. These known coating slips contain, as binders, plastic dispersions based on copolymers of butadiene-styrene, acrylonitrile-butadiene-styrene, acrylic acid esters, ethylene-vinyl chloride and ethylene-vinyl acetate; Homopolymers, such as polyvinyl chloride, polyvinylidene chloride, polyethylene and polyvinyl acetate; or polyurethanes.

Aluminum silicates such as china clay and kaolin, barium sulfate, satin white, titanium dioxide or calcium carbonate (chalk) are usually used to pigment the coating slips.

Formulations of such known coating slips for Paier are described, for example, in J.P. Casey "Pulp and Paper; Chemistry and Chemical Technology, 2 and Ed. Vol. III, p. 1648-1649 and in Mc Graw-Hill" Pulp and Paper Manufacture ", 2 and Ed. Vol. II p. 497.

The preparation of the preparation according to the invention is simple. It is done by mixing the components in any order at temperatures between 10 and 150 ° C. A preferred embodiment is to convert the components into a homogeneous phase at 80 to 120 ° C. After cooling, the ready-to-use product is obtained. If the anionic brightener is used as color acid, it is advantageous to concentrate it in the formation by adding neutralizing agents, preferably conc. To completely or partially neutralize NaOH.

The quantitative composition of the preparations according to the invention can be varied widely. Thus, with an increased content of organic, water-immiscible liquid, additives such as e.g. dispense with the water-soluble organic compound or the anionic solubilizer. Preparations of this type contain 5 to 30, preferably 10 to 20% by weight of water, 0.1 to 10, preferably 1 to 5% by weight of white clay, 10 to 55, preferably 30 to 40% by weight, organic liquid and 20 up to 80 wt .-%, preferably 35 to 55 wt .-% solubilizers.

On the other hand, it is often advantageous for ecological and economic reasons to keep the content of the water-immiscible organic liquid as low as possible. However, anionic solubilizers and, if appropriate, further organic, water-soluble auxiliaries are then required for stabilization. Such preparations contain 5 to 25 preferably 8-15% by weight of water, 0.5 to 5, preferably 1 to 3% by weight of dispersion white toner, 1 to 30, preferably 5 to 15% by weight of white toner containing sulfonic acid groups, 4 to 20, preferably 5 to 15% by weight .-% organic liquid, 20 to 50 wt .-%, preferably 30 to 45 wt .-% non-ionic solubilizers and 3 to 15, preferably 5 to 10 wt .-% anionic solubilizers, and up to ₄₀ , preferably 2 -10% by weight of water-miscible organic substances.

The coating composition according to the invention can be used for coating paper, wood, foils, textiles, non-woven materials and suitable building materials. Use on paper and cardboard and photo paper is particularly preferred.

The coating can be applied to the substrate by any conventional method and dried, for example with an air knife, doctor knife, brush, roller, squeegee or stick. The degree of whiteness that can be achieved can often be improved by drying at elevated temperatures.

In addition to high light fastness, the coatings obtained in this way have an excellent level of white.

example 1

100 g oleyl polyglycol ether (approx. 50 ÄO), 80 g tris (chloroethylphosphate), 5 g 3-phenyl-7-dimethylamino-N-ethylcarbostyril are heated with 40 ml H ₂ 0 to a clear solution. After cooling, a stable, single-phase and liquid system is obtained which mixes with water in all proportions to form a clear solution. Of these, 21.2 g become 1000 g of a paper coating slip composed of 375 g china clay, 1.2 g sodium polyphosphate, 145 g of an approx. 50% acrylic ester interpolymer, which is commercially available under the name Acronal S 320 D, and 478 , 8 g H ₂ 0 added.

This coating slip, the pH of which was approx. 8, was applied to conventional coating base paper by means of a wire doctor and dried at 100 ° C.

Spreads of the same coating slip on the same paper were used for comparison, and instead of the brightener dispersion according to the invention a conventional, water-soluble triazinylflavonic brightener (color index 40 622) with an active compound concentration of 22% in concentrations of 5 and 10 g per kg of coating slip was used.

The degree of whiteness of the coated papers was determined with the aid of the Berger degree of whiteness formula on Elrepho with a xenon lamp from Carl Zeiss.

The paper lightened according to the invention had a whiteness of 112.3 compared to 82.9 when using 5 g of the comparative brightener. Increased amounts of the comparison brightener lead to greening without any further increase in whiteness.

Example 2

If one uses the following instead of the amount of water mentioned in Example 1, the following lightenings are obtained depending on the amount of water used

For the two-phase systems, the value given relates to the hydrophobic phase.

Example 3

If the following colorless, organic compounds are used with the same weight instead of the tris-chloroethylphosphate used in Example 1, the following compounds are obtained:

Instead of uniform compounds, mixtures can be used with equal success.

Example 4

Instead of the dispersion brightener mentioned in Example 1, 5 g of the following dispersion brightener are used:

Example 5

The procedure is as described in Example 1 and 25 g of 4,4 '- [3-anilino-5-amino-1.3.5-triazinyl- (1)] - diaminostilbene -2,2'-disulfonic acid are added to the finished product by adding 5 ml of NaOH conc. be brought into solution.

On a binder mixture consisting of equal parts of casein and Acronal 320 D, 66 parts of this preparation provide the same brightening as 100 parts of the preparation produced according to Example 1. On pure, synthetic latex binder, 83 parts of the mixture are 100 parts coloristically equivalent to the preparation obtained according to Example 1.

Instead of triazinyl flavonate, other types of this series can be used with equal success, which are suitable for dyeing paper.

Example 6

eingerührt. Man erhält Aufhellungen von 105.5 bzw. 111.8 Berger-Weißgraden.5 ga) 4,4'-bis- [4-phenyl-1.2.3-triazoly- (2)] - stilbene-2,2'-disulfonic acid or b) 4 were added to the solution of the dispersion brightener prepared according to Example 1, 4 '- [1- (2-sulfonatophenyl) ethylidene (2) _{: 7} -biphenyl and concentrated with the aid of a few ml of NaOH. dissolved in a coating slip of the composition

stirred in. Lightenings of 105.5 and 111.8 Berger whiteness levels are obtained.

Example 7

The procedure is as described in Example 5 and 23 g of tris (2-chloroethyl) phosphate and 57 g of triethylene glycol acetate are used instead of the organic, water-insoluble compounds. Spread on paper you get a coating with whiteness 116.4.

Example 8

• Wasserlöslicher Aufheller der
• allgemeinen Formel
  
  

The procedure is as described in Example 1, but a paper coating slip composed of 90% synthetic latex and 10% casein is used. The following degrees of whiteness are obtained with 3-phenyl-7-dimethylamino-N-ethylcarbostyril and the following water-soluble brighteners:

• Water soluble brightener
• general formula
  
  

Example 9

25 g of methyl polyglycol ether, 8.6 g of caprolactam and 7.8 g of H ₂ 0 are dissolved in 9 g of Turkish red oil while heating. 5 g of trischloroethyl phosphate and 9 g of dimethylcyclohexyl phthalate are added. 2.5 g of 3-phenyl-7-dimethylamino-N-ethyl-carbostyril are then dissolved and 6 g of 4,4'- [4-amino-6-anilino-1,3,5-triazinyl (2) are stirred _{: 7} -diaminostilben-2,2 ^1- disulfonic acid with the addition of 1.5 ml conc. NaOH one until a clear solution. When incorporated into a paper coating slip as in Example 1, the sample shows 105.3 Berger whiteness.

Example 10

23 g of trischloroethyl phosphate, 17 g of Turkish red oil (50% aqueous solution), 50 g of a solution of caprolactam and H ₂ 0 in a molar ratio of 1: 1 and 2.5 g of 3-phenyl-7-dimethylamino-N-ethyl-carbostyril are dissolved . 22.5 g of a water-containing paste of 4,4 '- [(4-amino-6-anilino) -1,3,5-triazinyl (2) -] - diaminostilbene-2,2'-disulfonic acid with 55 are added , 5% Active ingredient and dissolves this with the addition of 3.5 ml of conc. NaOH to a clear solution. 26.2 g of the solution, incorporated in 1 kg of a coating slip without natural binder, as in Example 1, give 111.8 Berger degrees of whiteness. Replacing the water in the caprolactam complex with equimolar amounts of glycol or triethylene glycol results in 112.0 and 110.2 Berger degrees of whiteness.

Example 11

40 g glycerol polyethylene glycol polyoxystearate with approx. 45 mol ethylene oxide are dissolved in 5.1 ml water with 27 g caprolactam. 10 g of tris (chloroethyl) phosphate, 8.5 g of Turkish red oil and 2.5 g of 3-phenyl-7-dimethyl-N-ethylcarbostyril are mixed in and 21.9 g of a 57% strength aqueous paste of 4 are dissolved therein , 4 '- / 4-methylamino-6-anilino-1,3,5-triazinyl- (2)] - stilbene-2,2'-disulfonic acid.

When incorporated as in Example 1, an excellent brightening of 115.3 Berger degrees of whiteness is obtained.

Example 12

400 g oleyl polyglycol ether (approx. 50 ÄO) and 100 g tris (chloroethyl) phosphate are warmed to a clear solution. 270 g of caprolactam and 85 g of Turkish red oil are added as a 50% aqueous solution, and 25 g of 3-phenyl-7-dimethylamino-N-ethylcarbostyril and 125 g of 4,4 '- [4-amino-6-anilino- 1,3,5-triazinyl- (217-diaminostilbene-2,2-disulfonic acid ¹ by the addition of 120 ml of water and 25 ml of 45% sodium hydroxide solution in the mixture by heating until a clear solution. _M an obtained according to the Cool down a stable, single-phase and liquid system that deals with water in all proportions mixes into a clear solution. 16 g of this become 1000 g of a paper coating slip composed of 375 g of china clay, 1.2 g of sodium polyphosphate, 145 g of an approximately 50% acrylic ester copolymer, which is commercially available under the name Acronal S 320 D, and 478.8 g H ₂ 0 added.

This coating slip, the pH of which was approx. 8, was applied to conventional coating base paper by means of a wire doctor and dried at 1000C.

Spreads of the same coating slip on the same paper were used for comparison, a conventional water-soluble triazinylflavonic acid brightener (color index 40 622) having an active compound concentration of 22% based on the active compound being added to the coating slip instead of the brightener dispersion according to the invention .

The degree of whiteness of the coated papers was determined with the aid of the Berger degree of whiteness formula on Elrepho with a xenon lamp from Carl Zeiss.

The paper lightened according to the invention had a degree of whiteness of 108 Berger degrees of whiteness, while the comparative test only provides 99.6 Berger degrees of whiteness.

When stored at low temperatures, the formation is stable and easy to pour over 3 months.

Claims (10)

1. Preparation of optical brighteners, characterized by the solution of white tones in a single-phase system, containing water, organic liquids which boil above 150 ° C. and are not completely miscible with water, and a solubilizer. 2. Preparation according to claim 1, characterized in that it contains both a dispersion whitener and an anionic whitener. 3. Preparation of optical brightener according to claim 1, characterized in that it contains at least one non-ionic and one anionic solubilizer. 4. Preparation according to claim 1, characterized in that it additionally contains a water-miscible organic liquid. 5. Preparation according to claim 1, characterized in that it contains triethyl phosphate, trioctyl phosphate, tricresyl phosphate or trichloroethyl phosphate as the organic liquid. 6. Preparation according to claim 1, characterized in that it contains non-ionic and anonic emulsifiers as non-ionogenic and anionic solubilizers. 7. Preparation according to claim 1, characterized in that it 5 to 25 wt .-% water, 0.5 to 5 wt .-% Dis persion white toner, 1 to 30% by weight of sulfonic acid-containing white toner, 4 to 20% by weight of organic liquid, 25 to 50% by weight of non-ionic solubilizer and 3 to 15% by weight of anionic solvent and up to 40% by weight % contains water-miscible organic substance. 8. Preparation according to claim 1, characterized in that it contains 5 to 30% by weight of water, 0.1 to 10% by weight of white clay, 10 to 55% by weight of organic liquid and 20 to 80% by weight of solubilizer contains. ₉ .Preparation according to claim 1, characterized in that it contains 10 to 20 wt .-% water, 1 to 5 wt .-% whitener, from 30 to 40 wt .-% organic liquid and 35 to 55 wt .-% solubilizer. O. Process for whitening coating slips for the coating of paper, wood, foils, textiles, non-woven materials and building materials, characterized in that the preparation according to claim 1 is used.