DK147200B - TOUR, IN WATER DISPERSIBLE PIGMENT PREPARATION - Google Patents

Description

in 147200

The present invention relates to a dry, water dispersible pigment composition with good flocculation resistance which develops good color strength and good color values by dispersion in aqueous systems.

5 Previously, methods have been proposed to overcome the difficulties of uniformly incorporating pigments in latex emulsion paints. In the specification of U.S. Patent No. 3,067,053, e.g. disclosed a method for coating pigment particles in press cake form 10 with a nonionic surfactant (with or without an anionic surfactant) to improve the ease with which the agent is dispersed and to produce pigment compositions of excellent strength and color value. Slurries or pastes of these pigment formulations are readily dispersed in latex systems by simple mixing or stirring and do not require to be ground to develop durable color values. However, when such slurries or pastes are dried and pulverized, the dispersibility, the degree of color development and the strength are significantly reduced compared to the non-dried preparations.

From the disclosure of DK Patent No. 113,569, in organic media, in particular inks and lacquers based on mono or polyhydric alcohols, esters, ketones and benzene hydrocarbons, easily dispersible pigment preparations which are not comparable to water dispersible pigment preparations are known. For the known pigment preparations may be used polymers or resins dispersible in organic media, preferably maleinate resins, condensation products of formaldehyde, 4,4'-dioxide diphenylsulfone, salicylic acid and o-oxydiphenyl, chloro rubber or cellulose acetobutyrate.

Further, from the disclosure of U.S. Patent No. 3,652,313, pigment dispersions with improved dispersibility in latex paints are known. These known pigment dispersions contain at least 5% and preferably from 10-30% by weight, based on the pigment, water-soluble hydroxyalkyl cellulose, water-soluble partially saponified polyvinyl acetate or water-soluble partially etherated derivatives of polyvinyl acetates or polyvinyl alcohols, and optionally other additives, as well as agents (dispersants) and water-miscible high boiling solvents (wetting agents). However, the addition and nature of the wetting agent and dispersant to achieve the desired properties are not critical.

Thus, for example, the dispersant having the same result may be anionic, nonionic, or mixtures thereof, or the dispersant may be omitted. Furthermore, the addition of larger amounts of dispersants and wetting agents is undesirable as these impair the wet tear strength, alkali resistance and durability of the latex colors produced with the pigment dispersions. By drying the blends known from the above-mentioned United States patent specification, a poorer color strength and resistance to flocculation is developed relative to the non-dried preparations (dispersions). From these known dispersions, no dry compositions can be prepared which can be easily dispersed in aqueous systems and which are equivalent to aqueous systems in terms of color strength and other color properties.

It has now been found, in accordance with the present invention, that water 1: a dispersible pigment composition having a substantial content of nonionic materials can be provided.

These pigment compositions have good compatibility with latex emulsion colors and other aqueous systems as well as good resistance to flocculation and also develop substantially the same strength and color value as aqueous pigment dispersions which have not been dried.

The terms "substantially the same" and "equivalent to" used in the present specification to denote the strength and / or color value of pigment compositions shall mean a strength or color value which varies from the comparison with at most then. 5%.

U720Q

3

The pigment composition according to the invention is characterized in that it contains 55-78% by weight pigment and 45-22% by weight non-ionic material containing 15-45% by weight, based on the pigment, nonionic dispersant which is a polyether alcohol, a alkylene oxide alkylenediamine block polymer or a polyoxyethylene glycol or glycerol ester, 10-66.8% by weight, based on the pigment, of at least one water dispersible nonionic polymer which is (1) a least partially hydrolyzed polymer 10 of vinyl acetate or (2 ) a polymer of an N-vinylpyrrolidone and 0-40% by weight, based on the pigment, of a nonionic colloid, where the weight ratio of polymer + colloid to the dispersant is greater than 0.85.

Pigment compositions containing 60-75, 15, preferably 60-70% by weight of pigment are preferred.

The invention can be practiced with the inorganic and organic primer pigments, stretch pigments, metallic pigments and various finely divided soot pigments. Typical pigments include organic pigments such as diarylid yellow, phthalocyanine blue and phthalocyanine green, quinacridone red and quinacridone violet, dioxazine violet, and inorganic pigments such as cadmium red and yellow Also suitable are pigments of the hydrophilic type, such as e.g. titanium dioxide and lead chromate colors.

As mentioned above, the use of a certain type of nonionic dispersant in an amount of from 15 to 45% by weight of the pigment is necessary for carrying out the invention. The dispersing agents which have been found to be useful in the invention are polyether alcohols, alkylene oxide-alkylenediamine block polymers and polyoxyethylene glycol or glycerol esters, and generally have an HLB greater than 11 and preferably from about 1 12 to approx. 18. Preferred nonionic dispersion vials are polyether alcohols, especially the condensates of ethylene oxide and an alcohol, such as a collophonium resin alcohol or an alkylphenol.

Particularly preferred are the alkyl aryl polyether alcohols which contain on average 9-40 moles of ethylene oxide per liter. mole of alcohol and contains alkyl groups of 8-9 carbon atoms.

5 Polyether alcohol type dispersants are commercially available under the designation "Triton" ®, e.g. X-100, X-102, N-101 and N-III from Rohm & Haas Co., under the designation "Igepal" ® from General Aniline & Film Corp., under the designation "Hyonic" from Nopco Chemical Co. and under the designation "Tergitol" from 10 Union Carbide Corp. Typical of the alkylene oxide-amine block polymer dispersants are the materials formed by the addition of an alkylene oxide to an alkylenediamine, e.g. by addition of propylene oxide to ethylene diamine followed by addition of ethylene oxide. Dispersants of this type are commercially available under the designation "Tetronic" ® from Wyandotte Chemicals Corp. Non-ionic dispersants of the polyoxyethylene glycol or glycerol ester type include the ethoxylated fatty acid esters and collophonium resin esters such as polyethylene glycol fatty acid esters and / or polyethylene glycol collophonium resin acid esters and polyoxyethylene fatty acid end fatty acid esters and polyoxyethylene fatty acid esters moles of such acids as coconut fatty acid, stearic acid, oleic acid and collophonium resin fatty acid combinations. Dispersants of this type are commercially available under the designation 25 "Ethofat" ® from Armor Industrial Chemical Co. and "Atlas" ® G-1295 and G-1300 from the Atlas Chemical Division of I.C.I. America, Inc.

The amount of non-ionic dispersant ranges from 15 to 45% by weight of the pigment and sufficient dispersant 30 must be present to allow easy processing and particle size reduction. As a rule, an amount between about 15 and approx. 35% by weight of the pigment provide good dispersibility without damaging any other desirable properties.

5 147200

The practice of the invention also requires the presence of from 10 to 66.8% by weight based on the pigment of a water dispersible, nonionic polymer which is either a at least partially hydrolyzed polymer of vinyl acetate, a polymer of an N-vinylpyrrolidone or mixtures thereof. . The polymer has several functions in that it acts synergistically with the dispersant to reduce the pigment particle size beyond that obtainable with the dispersant alone, and it acts as a coating for the pigment particles to prevent gene agglomeration during the drying process and to prevent flocculation and provides wide compatibility in many different aqueous systems.

The at least partially hydrolyzed polymers of vinyl acetate which can be used according to the invention are the completely water dispersible and preferably the water-soluble products obtained by partial or complete hydrolysis of poly (vinyl acetate). All molecular weights and degrees of hydrolysis are suitable, but the higher molecular weights disperse more slowly and the higher hydrolysed grades, such as the fully hydrolyzed grades of poly (vinyl alcohol), somewhat reduce the water sensitivity of the pigment concentrates. The preferred hydrolyzed polymers of vinyl acetate which meet the above requirements and are useful in the practice of the invention include the water-soluble polymers which are at least 70% hydrolyzed and preferably about 30%. 80-90% hydrolyzed, and having a molecular weight in the range of approx. 2000 to approx. 130,000 and preferably from ca. 2000 to approx. 95,000. These polymers are commercially available under the designation "Gelvatol" ® (Monsanto Company), "Elvanol" ® 30 (EI duPont de Nemours and Company), "Lemol" ® (Borden Chemical Co.) and "Vinol" ® (Airco Corp.). ). Also useful are the water-soluble ether derivatives of the partially hydrolyzed poly (vinyl acetate) or poly (vinyl alcohol) wherein a portion and preferably at least 10% of the hydroxyl groups are reacted with an alkylene oxide such as ethylene oxide.

The polymers of an N-vinylpyrrolidone useful for carrying out the invention are the water dispersible, nonionic polymers. Particularly useful are polymers containing from 35 to 100 mole percent units of the formula H 2C-CH 2 R 1, σ c - o S 'ΝΪΓ - CH - CH 2 - wherein R and R 1 are hydrogen, methyl or ethyl, and from O to 65 mole percent units of one or more monoethylenically unsaturated comonomers which together with the N-vinylpyrrolidone provide nonionic copolymers with water dispersibility. Thus, the preferred N-vinyl pyrrolidones include N-vinyl-pyrrolidone, N-vinyl-5-methylpyrrolidone, N-vinyl-5-ethyl-pyrrolidone, N-vinyl-5,5-dimethylpyrrolidone, N-vinyl-5.5 diethylpyrrolidone and N-vinyl-5-ethylpyrrolidone.

Typical comonomers that can be polymerized with the N-vinylpyrrole idons are the vinyl esters such as vinyl acetate, acrylic acid esters such as ethyl acrylate, methacrylic acid esters such as methyl methacrylate, vinyl alkyl ethers such as vinyl cyclohexyl ether, vinyl halide, vinyl chloride, allyl chloride, allyl chloride, allyl

The most preferred polymers of N-vinylpyrrolidones are the 20 homopolymers of N-vinylpyrrolidone and its copolymers with vinyl esters having K-values of approx. 10 to 140 and preferably from 10-60 * Relative viscosity measurements referred to as K values are described in Modern Plastics, 23, No. 3, pages 157-161, 212, 214, 216 and 218 (1945). The polymers are easily obtained by conventional polymerization methods and are commercially available under the designation "Plasdon", "Polyclar" and "PVP" (General Aniline and Film Corp.).

Other nonionic materials may also be present, provided they do not impair the advantages of the invention. particularly

U720G

7 useful are the non-ionic materials known as protective colloids. They may be present in amounts up to 40% by weight of the pigment, but will usually only be used at low pigment concentrations. If present, the colloid will preferably comprise from -5 to 35% and most conveniently from 10 to 30% by weight of the pigment. Useful colloids include the nonionic cellulose ethers, starches and starch derivatives, the natural ones. gums, poly (alkylene oxides), poly (alkylene glycols), polyacrylamide and the like. Particularly preferred colloids are methylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, starch, pregelatinized starch, dextrin, hydroxypropyl starch, tapiocamel, wheat starch, casein, egg albumin, blood albumin, gelatin, gum bromine, gum brum, gum-15 ) and poly (ethylene glycol).

As colloids, starch derivatives are preferred in amounts of from 5% to 35% by weight based on the pigment.

Other non-ionic materials such as wetting agents, antifoam agents, etc. can be included in amounts up to approx. 3% by weight of the pigment, if desired.

The pigment compositions of the invention can be prepared by forming a specific homogeneous mixture and drying the mixture.

The first step can be performed in one or more steps. If a single step is used, all the components, i.e. the pigment, dispersant, polymer, colloid, if used, and water, milled or homogenized in the usual manner, e.g. in a ball mill or a Gaulin homogenizer until a homogeneous mixture is formed.

If two steps are used, and this is generally preferred for economic reasons, an aqueous dispersion of the pigment is first prepared by grinding or homogenizing the pigment in water in the presence of the nonionic dispersant, the pigment preferably having a press cake form. and then the pig dispersion thus prepared is thoroughly mixed in a second step with the desired amount of the water dispersible, nonionic polymer and the colloid, if used. The mixing in the second step can be carried out in any known way to mix 5 solids and liquids and is conveniently carried out by stirring and then homogenizing. The final step of the process is dehydration, whereby the water is removed until a dry preparation is obtained. Preferably, the water is removed by spray drying to give a finely divided dust-free product 10 directly. Alternatively, the water can be removed by tray drying and the dried product is cryogenically ground to produce a powdered product.

The invention is further illustrated by the following examples, in which all parts and percentages are by weight, unless otherwise stated.

Example 1.

, 184 parts of a copper phthalocyanine green press cake containing 68 parts of pigment (dry weight), 13.6 parts of isooctylphenylpolyethoxyethanol and 90 parts of water were added to a stainless steel tank equipped with a stirrer and the contents of the tank were stirred for 30 minutes at 25 ° C until deflocculation occurred. The deflocculated pigment was then passed once through a colloid mill and homogenizer, after which the aqueous dispersion thus prepared was stirred for 30 minutes with 0.3 parts of an antifoam agent and 18.4 parts of a hydrolyzed poly (vinyl acetate) having an average molecular weight of 10,000 and a residual poly (vinyl acetate) content of 19.5-21.5% and 87.7-89% hydrolyzed. The resulting mixture was passed once through the homogenizer, and the homogenized mixture was then spray dried at an inlet temperature of 305 ° C and an outlet temperature of 106 ° C to remove the water. A dry, non-dusty, particulate concentrate containing 68% pigment was obtained.

The dispersibility properties of the pigment composition in this example were assessed by hand mixing 1 part of the spray-dried pigment concentrate with 100 parts of an industrial latex paint (Regal Wall Satin) containing 20.1% titanium dioxide 5 14.3% silicates 65.6% film-forming carrier (vinyl acrylic aqueous emulsion) until a uniform paint dispersion 10 (about 5 minutes) was obtained. The paint dispersion was then separated into two equal portions, and one portion was stirred for a further 3 minutes using a propeller-type stirrer. Visual comparison of the hand-blended and mechanically stirred paints with respect to color strength on paper 15 showed no difference in color strengths.

The color strength and resistance to flocculation of the hand-mixed and mechanically stirred paints were further assessed by comparison with three control paints prepared in the same way as above, except that an equal amount of pigment based on the following aqueous pigment dispersions was used instead of the spray-dried pigment concentrate.

Control 1: The aqueous dispersion of deflocculated pigment prepared in the first step of this example.

Control 2: The aqueous counterpart of the pigment concentrate in this example, i.e. the dried homogeneous mixture.

Control 3: The industrial aqueous dispersion 'Super IMPerse Greeii' (phthalocyanin) - X-3289 - Her-30 Cules Incorporated.

Visual comparison of the hand-mixed and mechanically based paints on paper showed that the color strengths of all the samples were essentially the same and that there was no evidence of flocculation in any case. When the dried forms of Control 1 and Control 3 were used in place of their 5 aqueous forms, the dispersibility was poor (hand mixing versus mechanical mixing), the color strength and color values of the mechanically stirred samples were much poorer than the values obtained by use. of the aqueous forms of controls 1 and 3, and in both cases, the resistance to flocculation was poor.

Repeats of the above assessments using industrial latex paint compositions containing as the respective film-forming supports aqueous emulsions of a styrene-butadiene copolymer, an acrylic polymer, poly (vinyl acetate) or an acrylic alkyd gave identical results, showing that the dry pigment product in this example was light. dispersible in aqueous media and developed essentially the same strength and color value (calculated on a straight pigment basis) as the aqueous dispersion, its aqueous counterpart and the industrial aqueous pigment dispersion.

Example 2.

The procedure of Example 1 was repeated except that 229 parts of yellow pigment (CI Pigment Yellow 75) press cake containing 66 parts of pigment (dry base) were used in place of the 184 parts of copper phthalocyanine green press cake and 13.1 parts of isooctylphenyl polyethoxyethanol, 0 , 3 parts antifoam, 20.9 parts hydrolyzed poly (vinyl acetate) and 60 parts water.

The resulting product was a dry, redispersible concentrate containing 66% pigment in the form of non-dusty particles. When evaluated by Regal Wall Satin in accordance with the method of Example 1, its color strength and compatibility were essentially equivalent at a straight pigment level with values obtained using the control of its aqueous counterpart and the industrial aqueous pigment dispersion "Super IMPerse Yellow RX "® (X-3024 -Hercules Incorporated).

Example 3

11 parts of copper phthalocyanine blue press cake containing 60 parts of pigment (dry base) and 20 parts of isooctylphenylpolyethoxyethanol were added to a stainless steel tank equipped with 5 agitators and the contents of the tank were stirred for 30 minutes at 25 ° C until deflocculation occurred. The deflocculated pigment was then passed once through a colloid mill and a homogenizer, after which the aqueous dispersion thus prepared was stirred for 30 minutes with 1.2 parts of a commercially available nonionic wetting agent (alkylaryl polyether) and 180 parts of a 5% aqueous solution of the hydrolyzed poly (vinyl acetate) of Example 1. Then 9.8 parts of a starch derivative (a non-ionic filler type commercially available as 15 dextrins) was slowly added with stirring. and the mixture was stirred for a further 15 minutes, after which the stirring was stopped and the mixture was passed once through a homogenizer. The homogenized mixture was spray dried at an inlet temperature of 315 ° C and an outlet temperature of 20 121 ° C to remove the water. The resulting product was a dry, redispersible concentrate containing 60% pigment in the form of non-dusty particles. When evaluated by Regal Wall Satin according to the method of Example 1, its color strength and flocculation resistance were equivalent in equal pigment level to the values obtained using control of the aqueous dispersion of deflocculated pigment and that of the trade being aqueous pigment dispersion "Super IMPerse Blue B" ® (X-2687-Hercules Incorporated).

The dry dispersible pigment product in this example was also rated as a coloring agent for paper coating materials, disposable nonwoven fabrics, melamine-form aldehyde laminates and aqueous flexographic ink carriers and compared (on a straight pigment basis) with the same industrial aqueous dispersion as was used above. For all of these samples, the color value and compatibility were identical.

Examples 4 and 5.

147200 12

The procedure of Example 1 was repeated except that an equivalent amount of the following pigmented pigment in place of copper phthalocyanine-5 was used.

Example No. Pigment 4 Toluidine Red

5 Hansa GSX

The products in these Examples were rated by Regal Wall 10 Satin according to the method of Example 1 and gave essentially equal color strength (in equal pigment levels) compared to their aqueous counterparts and the commercially available aqueous pigment dispersions designated "Super IMPerse Red T" ® (X-2843) and "Super IMPerse Yellow GSX" ® (X-3488 -15 Hercules Incorporated).

Example 6

200 parts of yellow iron oxide pigment, 30 parts of the polyoxyethylene fatty acid glyceride, "Atlas G3100" ®, 30 parts of the hydrolyzed poly (vinyl acetate) of Example 1, 1.0 part of antifoam and 20 parts of water were added to a ball mill and the material was ground for 20 hours, after which the ball mill was emptied and rinsed once with water. The ground portion (also containing the rinsing water) was then air-dried at 60 ° C for 30 hours. The dried product was mixed with dry ice in a weight ratio of approx. 10/1 and the mixture was micropulverized through a 1.6 mm sieve. The resulting product was a dry, redispersible concentrate containing 77% pigment in the form of non-dusting grains. When judged by Regal Wall Satin in accordance with Method 30 of Example 1, its color strength and resistance to flocculation was equivalent to (on an equal basis) with the commercially available aqueous pigment dispersion "Super IMPerse Yellow Oxide" ® (X-3265 - Hercules Incorporated).

Example 7

13 147200 186 parts of copper phthalocyanine green press cake containing 68 parts of pigment (dry base), 13.6 parts of isooctylphenyl polyethoxyethanol and 95.4 parts of water were added to a stainless steel tank equipped with a stirrer and the contents of the tank were stirred for 30 minutes at 25 ° C until deflocculation occurred. The deflocculated pigment was passed once through a homogenizer, after which the aqueous dispersion thus prepared was stirred for 30 minutes with 0.3 parts 10 of an anti-foaming agent and 18.4 parts of poly (N-vinylpyrrolidone) having an average molecular weight of approx. 10,000 and a K value of 15-21. The mixture was passed once through a homogenizer and the resulting homogenized mixture was air dried for 30 hours at 60 ° C. The dried product was mixed with dry ice in a weight ratio of approx. Ιθ / l and the mixture was microp powdered through a 1.6 mm sieve. The resulting product was a dry, re-dispersible concentrate containing 68% pigment in the form of non-dusty particles. When product was evaluated by Regal Wall Satin according to the method of Example 1, its color value and compatibility were substantially equivalent (in equal pigment level) to the aqueous counterpart and the commercially available aqueous pigment dispersion used in Example 1.

Example 8.

The procedure of Example 7 was repeated except that 150 parts (65 parts on dry basis) of copper phthalocyanine green press cake, 8.25 parts of isooctylphenylpolyethoxyethanol, 118.6 parts of water and 0.2 parts of anti-foaming agent were used, and 36, 75 parts of the hydrolyzed poly (vinyl acetate) of Example 1 were used in place of the 18.4 parts poly (N-vinylpyrrolidone). The resulting product was a dry, redispersible concentrate containing 55% pigment in the form of non-dusty particles. When the product was evaluated by Regal. Wall Satin according to the method 35 of Example 1, its color value and compatibility were substantially equivalent (at equal pigment level) to its aqueous counterpart and the industrial aqueous pigment dispersion used in Example 1.

Example 9

The procedure of Example 6 was repeated except 5 using 27 parts of poly (N-vinylpyrrolidone) having an average molecular weight of approx. 10,000 and K-value of 15-21 instead of 30 parts of hydrolyzed poly (vinyl acetate).

The resulting product was a dry, redispersible concentrate containing 78% pigment in the form of soft, non-dusting grains. When the concentrate was evaluated by Regal Wall Satin according to the method of Example 1, its color strength, flocculation resistance and compatibility were equivalent (at the same pigment level) to the commercially available aqueous pigment dispersion used in Example 6.

Comparative Example A. Preparation of the pigment preparations.

I. In the same manner as described in Example 1, from 150 parts of yellow pigment (CI Pigment Yellow 75), 425 parts of water, 22.5 20 parts of isooctylphenyl polyethoxyethanol and 0.6 parts of anti-foaming agent is prepared a deflocculated pigment which is processed into an aqueous, pigment dispersion. 340.3 parts of this dispersion (corresponding to 65 parts of pigment and 9.75 parts of isooctylphenyl polyethoxyethanol) are mixed with 0.1 part of antifoam and 25.25 parts of hydrolyzed polyvinyl acetate of Example 1. After homogenization, the mixture is dried in an oven with air circulation , after which it is mixed with solid carbon dioxide in the weight ratio approx. 10/1 and pulverized. A dry concentrate containing 65% by weight of pigment and approx. 38.8% by weight of hydrolyzed polyvinyl acetate, based on the weight of the pigment, and 15% by weight of isooctylphenylpolyethoxyethanol, based on the weight of the pigment. This product is referred to as pigment preparation I.

II. Other 340.3 parts of the dispersion described under I) are mixed with 0.1 part of antifoam agent and 9.67 parts of the hydrolyzed polyvinyl acetate described in Example 1 and then processed as described above under I) to a dry concentrate containing 77% by weight 5 pigment, approx. 14.9% by weight of hydrolyzed polyvinyl acetate, based on the weight of the pigment, and 15% by weight of isooctylphenylpolyethoxyethanol, based on the weight of the pigment. This pigment preparation is called pigment preparation II.

III. Using the method described in Example 4 of U.S. Patent No. 3,652,313, a pigment dispersion is prepared, with 150 parts of yellow pigment (C.I.

Pigment Yellow 75), 650 parts 5% aqueous solution of the hydrolyzed polyvinyl acetate of Example 1 and 50 parts ethylene glycol are mixed for 30 minutes at 25 ° C with stirring. One half of the prepared homogeneous dispersion is processed in the same manner as described above under I) to a dry concentrate containing about 82.2% by weight pigment and approx. 21.7% by weight of hydrolyzed polyvinyl acetate, based on the weight of the pigment.

20 B. Investigating the dispersibility of latex paints.

In the same manner as described in Example 1, paint samples are prepared from the pigment preparations I, II and III and the corresponding aqueous pigment dispersions prepared as follows: a) by hand mixing the dry concentrate (0.65 parts pigment to 100 parts of the (B) by mixing the dry concentrate using a propeller-type stirrer (3 minutes stirring, 0.65 parts pigment to 100 parts of the latex described in Example 1); c) by mechanical mixing under strong force an equivalent amount, calculated on a pigment basis, of the aqueous non-dried pigment dispersion in said latex (control).

16 147200

The paint samples thus prepared are applied to paper.

Within a test circle, a small amount of even damp paint is ironed with your finger until the first sign of drying, with circular motions on the dry coating.

5 In this test, in addition to the color strength, the differences in color development are determined, which is a measure of the aggregation or coalescence and thus of the flocculation. The assessment is done by visual comparison of the color of the test circuit with the remaining coating surface using the following 10 rating system:

Good = no visible difference in color development.

Adequate = very little difference in color development.

Poor = clear difference in color development.

Very poor = big difference in color development- The results are given in the following table.

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Claims (4)

The paint samples prepared with the pigment compositions according to the invention are distinguished from the paint samples made from the specification known from US Patent No. 3,652,313, at a significantly better resistance to flocculation and a pronounced better color development. The paint samples Ib and Ilb (dry concentrate, mechanically mixed) prepared with the pigment compositions of the invention also exhibit a color strength which is more than 65% greater than the color strength of the comparison paint sample Illb with the same pigment content. Claims. 1. Dry, water dispersible pigment composition with good flocculation resistance, which develops good color strength and good color values by dispersion in aqueous systems, characterized in that the composition contains 55-78% by weight pigment and 45-22% by weight non-ionic material. containing 15-45% by weight, based on the pigment, nonionic dispersant which is a polyether alcohol, an alkylene oxide alkylene diamine block polymer or a polyoxyethylene glycol or glycerol ester, 10-66.8% by weight of the pigment, of water dispersible, nonionic polymer which is (1) a least partially hydrolyzed polymer of vinyl acetate or (2) a polymer of an N-vinylpyrrolidone, and 0-40% by weight, based on the pigment, of a -ionic colloid, where the weight ratio of polymer + colloid to the dispersant is greater than 0.85. Pigment composition according to claim 1, characterized in that the polymer is 80 to 90% by weight of hydrolyzed polyvinyl acetate. Pigment composition according to claim 1, characterized in that the polymer is poly- (N-vinylpyrrolidone). Pigment composition according to claims 1-3, characterized in that the dispersant is a polyether alcohol.