Pigment mixture

Abstract

A pigment mixture comprising at least two or three interference pigments of different interference colours selected from the colours red, green and blue, suitable for use in paints, coatings, printing inks, security printing inks, plastics, ceramic materials, glasses and in the preparation of pigment preparations, dry preparations and in particular cosmetic formulations.

Claims

1. A pigment mixture comprising two or three interference pigments which each have different interference colours, where the interference colours are selected from the colours red, blue and green and the CIE Lab* colour ranges of the individual pigments are defined as follows: red interference pigment: a25 and b0 blue interference pigment: 20a40 and b50 green interference pigment: a15 and b0, wherein the interference pigments are based on flake-form substrates and wherein said pigment mixture are suitable for cosmetics, wherein the flake-form substrates are natural mica, synthetic mica, glass flakes, SiO.sub.2 flakes, Al.sub.2O.sub.3 flakes or mixtures thereof, wherein the interference pigments have a particle size of D.sub.50<25 m, and wherein color intensity and hue of red/green/blue/gold of the pigment mixture is set solely by a mixing ratio of the two or three interference pigments.

2. A pigment mixture according to claim 1, wherein the CIE Lab* colour ranges of the individual pigments are defined as follows: red interference pigment: a30 and b5 blue interference pigment: 15a30 and b60 green interference pigment: a20 and b15.

3. A pigment mixture according to claim 1, wherein the CIE Lab* colour ranges of the individual pigments are defined as follows: red interference pigment: a35 and b5 blue interference pigment: 10a20 and b65 green interference pigment: a25 and b20.

4. A pigment mixture comprising two or three interference pigments which each have different interference colours, where the interference colours are selected from the colours red, blue and green and the CIE Lab* colour ranges of the individual pigments are defined as follows: red interference pigment: a25 and b0 blue interference pigment: 20a40 and b50 green interference pigment: a15 and b0 wherein the interference pigments are based on flake-form substrates and are suitable for cosmetics, wherein the interference pigments are based on flake-form substrates, wherein the flake-form substrates are natural mica, synthetic mica, glass flakes, SiO.sub.2 flakes, Al.sub.2O.sub.3 flakes or mixtures thereof, and wherein the interference pigments have a particle size of D.sub.50<25 m, and wherein color intensity and hue of red/green/blue/gold of the pigment mixture is set solely by a mixing ratio of the two or three interference pigments.

5. A pigment mixture according to claim 4, wherein the flake-form substrates are natural and/or synthetic mica.

6. A pigment mixture according to claim 4, wherein the flake-form substrates are enveloped with a highly refractive interference layer having a refractive index of 1.8.

7. A pigment mixture according to claim 6, wherein the highly refractive layer is a TiO.sub.2 layer or consists of a sequence of TiO.sub.2SiO.sub.2TiO.sub.2.

8. A process for the preparation of the pigment mixture according to claim 1, wherein two or three interference pigments are mixed with one another.

9. A method comprising including a pigment mixture according to claim 1 in paints, coatings, printing inks, security printing inks, plastics, ceramic materials, glazes, glasses, and cosmetic formulations, and for the preparation of pigment preparations and dry preparations.

10. A method according to claim 9 wherein the pigment mixture is included in medical covering ointments, contour sticks, makeups, foundations and concealers.

11. A formulation comprising a pigment mixture according to claim 1.

12. A formulation according to claim 11, which comprises the pigment mixture and at least one constituent selected from absorbents, astringents, antimicrobial substances, antioxidants, antiperspirants, antifoaming agents, antidandruff active compounds, antistatics, binders, biological additives, bleaching agents, chelating agents, deodorising agents, emollients, emulsifiers, emulsion stabilisers, dyes, humectants, film formers, fillers, fragrances, flavours, insect repellents, preservatives, corrosion protection agents, cosmetic oils, solvents, oxidants, vegetable constituents, buffer substances, reducing agents, surfactants, propellant gases, opacifying agents, UV filters and UV absorbers, denaturing agents, aloe vera, avocado oil, coenzyme Q10, green tea extract, viscosity regulators, perfume and vitamins.

13. A pigment mixture according to claim 4, wherein the interference pigments have a particle size of D.sub.50<25 m.

14. A pigment mixture comprising two or three interference pigments which each have different interference colours, where the interference colours are selected from the colours red, blue and green and the CIE Lab* colour ranges of the individual pigments are defined as follows: red interference pigment: a25 and b0 blue interference pigment: 20a40 and b50 green interference pigment: a15 and b0 and wherein the interference pigments are based on flake-form substrates and have a particle size distribution, determined in accordance with Malvern, Mastersizer 2000, of D.sub.10=<12 m, D.sub.50=<25 m, D.sub.90=<45 m, and wherein color intensity and hue of red/green/blue/gold of the pigment mixture is set solely by a mixing ratio of the two or three interference pigments.

15. A pigment mixture of claim 14 wherein the interference pigments have a particle size distribution, determined in accordance with Malvern, Mastersizer 2000, of D.sub.10=<10 m, D.sub.50=<15 m, D.sub.90=<20 m.

16. A pigment mixture of claim 14 wherein the interference pigments have a particle size distribution, determined in accordance with Malvern, Mastersizer 2000, of D.sub.10=<7 m, D.sub.50=<12 m, D.sub.90=<17 m.

Description

EXAMPLES

(1) The a and b values of the individual interference pigments are determined using a STEAG ETA-Optik spectrometer as follows: a black-coated paint card is coated using a hand coater (gap width 500 m) with a nitrocellulose lacquer which comprises 1.65 percent by weight of the interference pigment or pigment mixture in question.

(2) After drying, the colour is measured below 95 using the above-mentioned measuring instrument at an angle of incidence of 75. 90 is the perpendicular to the paint card.

Example 1

Preparation of a Red Interference Pigment having a High Yellow Content Based on Aluminium Oxide Flakes

(3) 100 g of Al.sub.2O.sub.3 flakes having a particle size of 5-30 m (D.sub.50=18 m) are suspended in 1.6 l of demineralised water, and the suspension is warmed to 75 C. with vigorous stirring. A solution of 5 g of SnCl.sub.45H.sub.2O in 70 g of water is slowly metered into this suspension at pH=2. The pH is kept constant at 2 using 32% sodium hydroxide solution. The pH is then reduced to 1.8, and 820 g of a 32% TiCl.sub.4 solution are slowly metered in at this pH. During this addition, the pH is kept constant using 32% sodium hydroxide solution. The addition of the TiCl.sub.4 solution is terminated when the desired colour end point has been reached. After termination of the TiCl.sub.4 addition, the mixture is stirred for a further hour, and the coated Al.sub.2O.sub.3 flakes are then filtered off, washed and dried at 110 C. for 15 h. Finally, the pigment is calcined at 850 C. for 1 h.

(4) The red interference pigment has the following a and b values:

(5) TABLE-US-00001 a: 48.55 b: 18.37

Example 2

Preparation of a Red Interference Pigment having a High Yellow Content Based on Mica

(6) 100 g of natural mica having a particle size of 5-25 m (D.sub.50=11 m) are suspended in 2 l of demineralised water, and the suspension is warmed to 75 C. with vigorous stirring. A solution of 3 g of SnCl.sub.45H.sub.2O in 100 g of water is slowly metered into this suspension at pH=2. The pH is kept constant at 2 using 32% sodium hydroxide solution. The pH is then reduced to 1.8, and 1100 g of a 32% TiCl.sub.4 solution are slowly metered in at this pH. During this addition, the pH is kept constant using 32% sodium hydroxide solution. The addition of the TiCl.sub.4 solution is terminated when the desired colour end point has been reached. After termination of the TiCl.sub.4 addition, the mixture is stirred for a further hour, and the coated mica pigment is then filtered off, washed and dried at 110 C. for 15 h. Finally, the pigment is calcined at 850 C. for 1 h.

(7) The red interference pigment has the following a and b values:

(8) TABLE-US-00002 a: 40.64 b: 13.41

Example 3

Preparation of a Blue Interference Pigment Based on Aluminium Oxide Flakes

(9) 100 g of Al.sub.2O.sub.3 flakes having a particle size of 5-30 m (D.sub.50=18 m) are suspended in 1.6 l of demineralised water, and the suspension is warmed to 75 C. with vigorous stirring. A solution of 9.3 g of SnCl.sub.45H.sub.2O in 130 g of water is slowly metered into this suspension at pH=2. During this addition, the pH is kept constant at 2 using 32% sodium hydroxide solution. The pH is then reduced to 1.8, and 714 g of a 32% TiCl.sub.4 solution are slowly metered in at this pH. During this addition, the pH is kept constant using 32% sodium hydroxide solution. The addition of the TiCl.sub.4 solution is terminated when the desired colour end point has been reached. After termination of the TiCl.sub.4 addition, the mixture is stirred for a further hour, and the coated Al.sub.2O.sub.3 flakes are then filtered off, washed and dried at 110 C. for 15 h. Finally, the pigment is calcined at 850 C. for 1 h.

(10) The blue interference pigment has the following a and b values:

(11) TABLE-US-00003 a: 2.61 b: 59.75

Example 4

Preparation of a Blue interference Pigment Based on Mica

(12) 70 g of natural mica having a particle size of 1-20 m (D.sub.50=9 m) are suspended in 1.4 l of demineralised water, and the suspension is warmed to 75 C. with vigorous stirring. A solution of 15 g of SnCl.sub.45H.sub.2O in 210 g of water is slowly metered into this suspension at pH=2. The pH is kept constant at 2 using 32% sodium hydroxide solution. The pH is then reduced to 1.8, and 1056 g of a 32% TiCl.sub.4 solution are slowly metered in at this pH. During this addition, the pH is kept constant using 32% sodium hydroxide solution. The addition of the TiCl.sub.4 solution is terminated when the desired colour end point has been reached. After termination of the TiCl.sub.4 addition, the mixture is stirred for a further hour, and the coated mica pigment is then filtered off, washed and dried at 110 C. for 15 h. Finally, the pigment is calcined at 850 C. for 1 h.

(13) The blue interference pigment has the following a and b values:

(14) TABLE-US-00004 a: 12.44 b: 82.11

Example 5

Preparation of a Green Interference Pigment Having a High Yellow Content Based on Aluminium Oxide Flakes

(15) 100 g of Al.sub.2O.sub.3 flakes having a particle size of 5-30 m (D.sub.50=18 m) are suspended in 1.6 l of demineralised water, and the suspension is warmed to 75 C. with vigorous stirring. A solution of 5 g of SnCl.sub.45H.sub.2O in 100 g of water is slowly metered into this suspension at pH=2. The pH is kept constant at 2 using 32% sodium hydroxide solution. The pH is then reduced to 1.8, and 878 g of a 32% TiCl.sub.4 solution are slowly metered in at this pH. During this addition, the pH is kept constant using 32% sodium hydroxide solution. The addition of the TiCl.sub.4 solution is terminated when the desired colour end point has been reached. After termination of the TiCl.sub.4 addition, the mixture is stirred for a further hour, and the coated Al.sub.2O.sub.3 flakes are then filtered off, washed and dried at 110 C. for 15 h. Finally, the pigment is calcined at 850 C. for 1 h.

(16) The green interference pigment has the following a and b values:

(17) TABLE-US-00005 a: 46.81 b: 34.62

Example 6

Preparation of a Green Interference Pigment Having a High Yellow Content Based on Mica

(18) 70 g of natural mica having a particle size of 5-25 m (D.sub.50=11 m) are suspended in 1.4 l of demineralised water, and the suspension is warmed to 75 C. with vigorous stirring. A solution of 2.1 g of SnCl.sub.45H.sub.2O in 70 g of water is slowly metered into this suspension at pH=2. During this addition, the pH is kept constant at 2 using 32% sodium hydroxide solution. The pH is then reduced to 1.8, and 1005 g of a 32% TiCl.sub.4 solution are slowly metered in at this pH. The addition of the TiCl.sub.4 solution is terminated when the desired colour end point has been reached. After termination of the TiCl.sub.4 addition, the mixture is stirred for a further hour, and the coated mica pigment is then filtered off, washed and dried at 110 C. for 15 h. Finally, the pigment is calcined at 850 C. for 1 h.

(19) The green interference pigment has the following a and b values:

(20) TABLE-US-00006 a: 32.89 b: 35.18

Example 7

Preparation of a Green Interference Pigment Having a High Yellow Content Based on Glass Flakes

(21) 100 g of glass flakes having a particle size of 10-60 m (D.sub.50=22 m) and an average thickness of 450 nm are suspended in 1.4 l of demineralised water, and the suspension is warmed to 75 C. with vigorous stirring. The pH is then increased to pH 8 using sodium hydroxide solution, and a solution of 38 g of sodium water-glass (13% of SiO.sub.2) are metered in at this pH over the course of 90 min. During this addition, the pH is kept constant using hydrochloric acid (18% by weight of HCl). The pH is subsequently reduced to pH 2 over the course of 45 min., and a solution of 5 g of SnCl.sub.45H.sub.2O in 70 g of water is slowly metered in at this pH. During this addition, the pH is kept constant at 2 using 32% sodium hydroxide solution. The pH is then reduced to 1.6, and 997 g of a 32% TiCl.sub.4 solution are slowly metered in at this pH. During this addition, the pH is kept constant using 32% sodium hydroxide solution. The addition of the TiCl.sub.4 solution is terminated when the desired colour end point has been reached. After termination of the TiCl.sub.4 addition, the mixture is stirred for a further hour, and the coated glass flakes are then filtered off, washed and dried at 110 C. for 15 h. Finally, the pigment is calcined at 650 C. for 1 h.

(22) The green interference pigment has the following a and b values:

(23) TABLE-US-00007 a: 35.28 b: 37.11

Example 8

Preparation of a Red Interference Pigment Having a High Yellow Content Based on Synthetic Mica

(24) 100 g of synthetic mica having a particle size of 5-40 m (D.sub.50=17 m) are suspended in 2 l of demineralised water, and the suspension is warmed to 75 C. with vigorous stirring. The pH is then adjusted to pH 2.5 using hydrochloric acid (18% by weight of HCl). 9 g of AlCl.sub.3 solution (29% by weight of AlCl.sub.3) are metered in at this pH over the course 2 min., and the mixture is stirred for a further 15 min. 233 g of SnCl.sub.4 solution (2.1% by weight of SnCl.sub.4) are slowly metered into this suspension at pH=1.7. The pH is kept constant at 1.7 using 32% sodium hydroxide solution. The pH is then reduced to 1.4 using hydrochloric acid, and 848 g of a 32% TiCl.sub.4 solution are slowly metered in at this pH. During this addition, the pH is kept constant using 32% sodium hydroxide solution. The addition of the TiCl.sub.4 solution is terminated when the desired colour end point has been reached. After termination of the TiCl.sub.4 addition, the mixture is stirred for a further hour, and the coated mica pigment is then filtered off, washed and dried at 110 C. for 15 h. Finally, the pigment is calcined at 850 C. for 30 min.

(25) The red interference pigment has the following a and b values:

(26) TABLE-US-00008 a: 52.71 b: 17.24

Paint Example 1

(27) A mixture of red interference pigment in accordance with Example 2 and green interference pigment in accordance with Example 6 in the mixing ratio 1:1 is spread on a paint card and measured. The mixture has a strong gold hue.

(28) The measurement of the paint card gives the following values:

(29) TABLE-US-00009 a: 1.55 b: 22.13

USE EXAMPLES

Example A1

Contouring Stick for the Face

(30) TABLE-US-00010 Ingredients INCI (EU) [%] Red interference CI 77891 (Titanium Dioxide), Mica, 5.00 pigment according to Tin Oxide Example 2 Green interference CI 77891 (Titanium Dioxide), Mica, 5.00 pigment according to Tin Oxide Example 6 Blue interference CI 77891 (Titanium Dioxide), Mica, 5.00 pigment according to Tin Oxide Example 4 Oxynex K liquid PEG-8, TOCOPHEROL, 0.05 ASCORBYL PALMITATE, ASCORBIC ACID, CITRIC ACID Sensiva PA 20 PHENETHYL ALCOHOL, 1.00 ETHYLHEXYL GLYCERIN Paraffin viscous PARAFFINUM LIQUIDUM 2.10 Adeps Lanae LANOLIN 3.50 Paracera C 44 COPERNICIA CERIFERA CERA, 5.20 CERESIN Isopropyl myristate ISOPROPYL MYRISTATE 5.60 Wax white CERA ALBA 8.75 Fragrance PARFUM 0.20 Castor oil RICINUS COMMUNIS SEED OIL to 100.00

Example A2

Medical Covering Ointment for Strong Hiding of Pigment/Age Spots

(31) TABLE-US-00011 Ingredients INCI (EU) [%] Red interference CI 77891 (Titanium Dioxide), Mica, 6.00 pigment according to Tin Oxide Example 2 Green interference CI 77891 (Titanium Dioxide), Mica, 6.00 pigment according to Tin Oxide Example 6 Blue interference CI 77891 (Titanium Dioxide), Mica, 6.00 pigment according to Tin Oxide Example 4 Oxynex K liquid PEG-8, TOCOPHEROL, 0.05 ASCORBYL PALMITATE, ASCORBIC ACID, CITRIC ACID Sensiva PA 20 PHENETHYL ALCOHOL, 1.00 ETHYLHEXYL GLYCERIN Paraffin viscous PARAFFINUM LIQUIDUM 2.10 Adeps Lanae LANOLIN 3.50 Paracera C 44 COPERNICIA CERIFERA CERA, 5.25 CERESIN Isopropyl myristate ISOPROPYL MYRISTATE 5.60 Wax white CERA ALBA 8.75 Castor oil RICINUS COMMUNIS SEED OIL to 100.00

Example A3

Face Make Up with UV Protection and for Freshening Up the Complexion

(32) TABLE-US-00012 Ingredients INCI (EU) [%] Red interference CI 77891 (Titanium Dioxide), 7.50 pigment according to Mica, Tin Oxide Example 2 Green interference CI 77891 (Titanium Dioxide), 2.50 pigment according to Mica, Tin Oxide Example 6 Blue interference CI 77891 (Titanium Dioxide), 5.00 pigment according to Mica, Tin Oxide Example 4 Texapon K 12 P SODIUM LAURYL 0.60 SULFATE Veegum MAGNESIUM ALUMINUM 1.00 SILICATE 1,2-Propanediol PROPYLENE GLYCOL 10.00 Eusolex OCR OCTOCRYLENE 2.00 Parteck LUB STA 50 STEARIC ACID 1.50 Eusolex 9020 BUTYL 0.50 METHOXYDIBENZOYL- METHANE RonaCare AP BIS-ETHYLHEXYL 0.50 HYDROXYDIMETHOXY BENZYLMALONATE Parteck LUB MST MAGNESIUM STEARATE 0.10 Tego Care 450 POLYGLYCERYL-3 3.50 METHYLGLUCOSE DISTEARATE Eutanol G OCTYLDODECANOL 5.50 Isopropyl myristate ISOPROPYL MYRISTATE 6.50 Euxyl PE 9010 PHENOXYETHANOL, 1.00 ETHYLHEXYL GLYCERIN Fragrance PARFUM 0.20 Water, demineralized AQUA to 100.00

Example A4

Skin Elixir for Slight Freshening Up of Colour

(33) TABLE-US-00013 Ingredients INCI (EU) [%] Red interference CI 77891 (Titanium Dioxide), 1.00 pigment according to Mica, Tin Oxide Example 2 Green interference CI 77891 (Titanium Dioxide), 2.00 pigment according to Mica, Tin Oxide Example 6 Blue interference CI 77891 (Titanium Dioxide), 0.50 pigment according to Mica, Tin Oxide Example 4 Glycerol 85% GLYCERIN, AQUA 3.00 Carbopol ETD 2020 ACRYLATES/C10-30 ALKYL 0.20 ACRYLATE CROSSPOLYMER Cetiol OE DICAPRYLYL ETHER 3.00 Crodamol ISIS-LQ-(MV) ISOSTEARYL ISOSTEARATE 2.50 Tegosoft DC DECYL COCOATE 1.50 Novemer EC-2 SODIUM 0.50 Polymer ACRYLATES/BEHENETH-25 METHACRYLATE CROSSPOLYMER, HYDROGENATED POLYDECENE, LAURYL GLUCOSIDE Sodium hydroxide, 10% AQUA, SODIUM HYDROXIDE 0.00 Water, demineralized AQUA to 100.00

Example A5

W/Si Liquid Foundation with UV Protection

(34) TABLE-US-00014 Ingredients INCI (EU) [%] Red interference CI 77891 (Titanium Dioxide), 3.00 pigment according to Mica, Tin Oxide Example 2 Green interference CI 77891 (Titanium Dioxide), 3.00 pigment according to Mica, Tin Oxide Example 6 Blue interference CI 77891 (Titanium Dioxide), 3.00 pigment according to Mica, Tin Oxide Example 4 Glycerol 85% GLYCERIN, AQUA 8.00 Eusolex T-S TITANIUM DIOXIDE (NANO), 8.50 ALUMINA, STEARIC ACID KF-6028 PEG-9 3.50 POLYDIMETHYLSILOXYETHYL DIMETHICONE KF-6038 LAURYL PEG-9 2.00 POLYDIMETHYLSILOXYETHYL DIMETHICONE USG-105 DIMETHICONE/VINYL 1.00 DIMETHICONE CROSSPOLYMER, METHYL TRIMETHICONE TMF-1.5 METHYL TRIMETHICONE 17.00 DM-Fluid-A-6cs DIMETHICONE 10.00 Salacos 913 ISOTRIDECYL ISONONANOATE 4.00 KF-56A DIPHENYLSILOXY PHENYL 5.00 TRIMETHICONE Bentone 38 V DISTEARDIMONIUM 0.85 HECTORITE KSP-100 VINYL 2.50 DIMETHICONE/METHICONE SILSESQUIOXANE CROSSPOLYMER Water, demineralized AQUA to 100.00

Example A6

Face Powder for Balancing Out Slightly Yellowish Hues for Pale Asiatic Skin

(35) TABLE-US-00015 Ingredients INCI (EU) [%] Red interference CI 77891 (Titanium Dioxide), 1.00 pigment according to Mica, Tin Oxide Example 2 Blue interference CI 77891 (Titanium Dioxide), 1.50 pigment according to Mica, Tin Oxide Example 4 Unipure Red LC 381 CI 77491 0.22 Unipure Brown LC 889 CI 77491, CI 77499 0.35 Parteck LUB MST MAGNESIUM STEARATE 2.40 Eutanol G OCTYLDODECANOL 4.40 Parteck LUB talc TALC to 100.00

Example A7

Face Powder for Balancing Out Slightly Yellowish Hues on Darker Skin Types

(36) TABLE-US-00016 Ingredients INCI (EU) [%] Red interference CI 77891 (Titanium Dioxide), 2.50 pigment according to Mica, Tin Oxide Example 2 Blue interference CI 77891 (Titanium Dioxide), 2.50 pigment according to Mica, Tin Oxide Example 4 Unipure Red LC 381 CI 77491 0.22 Unipure Brown LC 889 CI 77491, CI 77499 0.35 Parteck LUB MST MAGNESIUM STEARATE 2.40 Eutanol G OCTYLDODECANOL 4.40 Parteck LUB talc TALC to 100.00

Example A8

Face Powder for Balancing Held Slightly Reddish Shades on Caucasian Skin Type

(37) TABLE-US-00017 Ingredients INCI (EU) [%] Red interference CI 77891 (Titanium Dioxide), 2.00 pigment according to Mica, Tin Oxide Example 2 Blue interference CI 77891 (Titanium Dioxide), 0.50 pigment according to Mica, Tin Oxide Example 4 Unipure Red LC 381 CI 77491 0.22 Unipure Brown LC 889 CI 77491, CI 77499 0.35 Parteck LUB MST MAGNESIUM STEARATE 2.40 Eutanol G OCTYLDODECANOL 4.40 Parteck LUB talc TALC to 100.00

(38) The preceding examples can be repeated with similar success by substituting the generically or specifically described reactants and/or operating conditions of this invention for those used in the preceding examples.

(39) From the foregoing description, one skilled in the art can easily ascertain the essential characteristics of this invention and, without departing from the spirit and scope thereof, can make various changes and modifications of the invention to adapt it to various usages and conditions.