Pigments

Abstract

The present invention relates to interference pigments based on multicoated flake-form substrates which have on the surface of the substrate a layer sequence comprising (A0) optionally a high-refractive-index coating consisting of a layer of TiO.sub.2, (A) a high-refractive-index coating consisting of a mixture of TiO.sub.2 and Fe.sub.2O.sub.3, which may optionally be doped with one or more further oxides, (B) a high-refractive-index layer consisting of SnO.sub.2, (C) a high-refractive-index coating which absorbs in the visible wavelength region, and optionally (D) an outer protective layer, and to the use thereof, in particular in paints, coatings, industrial coatings, automobile paints, automotive refinish paints, coil coating, powder coatings, printing inks, plastics, pigment pastes, pigment preparations and in dry preparations, such as, for example, granules.

Claims

1. An interference pigment comprising a flake-form substrate and on the surface of the substrate a coating having a layer sequence consisting of: (A0) optionally a high-refractive-index coating consisting of a layer of TiO.sub.2, (A) a high-refractive-index coating consisting of a mixture of TiO.sub.2 and Fe.sub.2O.sub.3, which may optionally be doped with one or more further oxides, (B) a high-refractive-index layer consisting of SnO.sub.2, (C) a high-refractive-index coating which absorbs in the visible wavelength region, and optionally (D) an outer protective layer.

2. Interference pigment according to claim 1, wherein the flake form substrate is of natural or synthetic mica, glass flakes, Al.sub.2O.sub.3 flakes, SiO.sub.2 flakes or TiO.sub.2 flakes or flake-form materials coated with metal oxides.

3. Interference pigment according to claim 1, wherein the flake form substrate is of mica flakes, glass flakes or Al.sub.2O.sub.3 flakes.

4. Interference pigment according to claim 1, wherein the flake form substrate is of SiO.sub.2-coated glass flakes.

5. Interference pigment according to claim 1, wherein coating (A) is doped with one or more oxides selected from Al.sub.2O.sub.3, Ce.sub.2O.sub.3, B.sub.2O.sub.3, ZrO.sub.2, and SnO.sub.2.

6. Interference pigment according to claim 1, wherein coating (C) is a TiO.sub.2 layer followed by an Fe.sub.2O.sub.3 layer, or an Fe.sub.2O.sub.3 layer, or a layer consisting of a mixture of TiO.sub.2 and Fe.sub.2O.sub.3, or a TiO.sub.2 layer followed by a layer of Carmine Red, or a TiO.sub.2 layer followed by a layer of Berlin Blue.

7. Interference pigment according to claim 1, wherein the pigment has the following layer sequence on the substrate: substrate+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 substrate+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 substrate+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Fe.sub.2O.sub.3 substrate+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+Fe.sub.2O.sub.3 substrate+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+Fe.sub.3O.sub.4 substrate+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Carmine Red substrate+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Berlin Blue substrate+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 substrate+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 substrate+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Fe.sub.2O.sub.3 substrate+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+Fe.sub.2O.sub.3 substrate+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+Fe.sub.3O.sub.4 substrate+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Carmine Red or substrate+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Berlin Blue.

8. Interference pigment according to claim 1, wherein the pigment has the following structure: synthetic mica flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 synthetic mica flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 synthetic mica flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Fe.sub.2O.sub.3 synthetic mica flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+Fe.sub.2O.sub.3 synthetic mica flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 synthetic mica flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 synthetic mica flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Fe.sub.2O.sub.3 synthetic mica flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+Fe.sub.2O.sub.3 glass flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 glass flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 glass flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Fe.sub.2O.sub.3 glass flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+Fe.sub.2O.sub.3 glass flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 glass flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 glass flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Fe.sub.2O.sub.3 glass flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+Fe.sub.2O.sub.3 glass flakes+SiO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 glass flakes+SiO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 glass flakes+SiO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Fe.sub.2O.sub.3 glass flakes+SiO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+Fe.sub.2O.sub.3 glass flakes+SiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 glass flakes+SiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 glass flakes+SiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Fe.sub.2O.sub.3 glass flakes+SiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+Fe.sub.2O.sub.3 Al.sub.2O.sub.3 flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 Al.sub.2O.sub.3 flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 Al.sub.2O.sub.3 flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Fe.sub.2O.sub.3 Al.sub.2O.sub.3 flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+Fe.sub.2O.sub.3 Al.sub.2O.sub.3 flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 Al.sub.2O.sub.3 flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 Al.sub.2O.sub.3 flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Fe.sub.2O.sub.3 Al.sub.2O.sub.3 flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+Fe.sub.2O.sub.3 SiO.sub.2 flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 SiO.sub.2 flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Fe.sub.2O.sub.3 SiO.sub.2 flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+Fe.sub.2O.sub.3 SiO.sub.2 flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 SiO.sub.2 flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 SiO.sub.2 flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Fe.sub.2O.sub.3 SiO.sub.2 flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+Fe.sub.2O.sub.3 natural mica flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 natural mica flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 natural mica flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Fe.sub.2O.sub.3 natural mica flakes+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+Fe.sub.2O.sub.3 natural mica flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 natural mica flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+TiO.sub.2/Fe.sub.2O.sub.3 natural mica flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+TiO.sub.2+Fe.sub.2O.sub.3 or natural mica flakes+TiO.sub.2/Fe.sub.2O.sub.3+SnO.sub.2+Fe.sub.2O.sub.3.

9. Interference pigment according to claim 7, wherein the interference pigment additionally has an outer protective layer (D).

10. Interference pigment according to claim 1, wherein the thickness of all layers (A0)-(C) together on the substrate is 300 nm.

11. Process for the preparation of an interference pigment according to claim 1, comprising applying metal oxides corresponding to the layers to the flake-form substrate by wet-chemical methods, by hydrolytic decomposition of metal salts in aqueous medium or by gas-phase coating in a fluidised-bed reactor.

12. A composition selected from the group consisting of compositions for: paints, coatings, industrial coatings, coil coating, automobile paints, automotive refinish paints, powder coatings, printing inks, security printing inks, plastics, ceramic materials, cosmetic formulations, glasses, paper, toners for electrophotographic printing processes, seed, greenhouse sheeting and tarpaulins, absorbers in the laser marking of paper and plastics, cosmetic formulations, the preparation of pigment pastes with water, organic and/or aqueous solvents, the preparation of pigment preparations and dry preparations, the mass colouring of foods, the colouring of coatings of food products and pharmaceutical products; which comprises a interference pigment according to claim 1.

13. Formulations comprising one or more interference pigments according to claim 1.

14. Pigment preparations comprising one or more binders and or more interference pigments according to claim 1.

15. Dry preparations comprising interference pigments according to claim 1.

Description

EXAMPLES

Example 1: Al2O3 Flake+TiO2/Fe2O3+SnO2+TiO2/Fe2O3

(1) 100 g of Al.sub.2O.sub.3 flakes of particle size 5-40 m are heated to 75 C. in 1.5 l of demineralised water. When this temperature has been reached, 460 g of a mixed solution of 167 g of TiCl.sub.4 solution (30% by weight of TiCl.sub.4), 222 g of FeCl.sub.3 solution (14% of Fe), 6.6 g of AlCl.sub.36 H.sub.2O and 111 g of demineralised water are slowly metered in with vigorous stirring. The pH is kept constant at pH 2.6 using 32% sodium hydroxide solution. After addition of this solution, the pH is lowered to pH=1.8 using hydrochloric acid (18% of HCl), and 805 g of an SnCl.sub.4 solution (2% by weight of SnCl.sub.4) stabilised with concentrated hydrochloric acid are metered in at this pH over the course of 300 minutes. The pH is then raised to 2.6 using 32% sodium hydroxide solution, and 835 g of a mixed solution of 306 g of TiCl.sub.4 solution (30% by weight of TiCl.sub.4), 399 g of FeCl.sub.3 solution (14% of Fe), 11.8 g of AlCl.sub.36 H.sub.2O and 224 g of demineralised water are slowly metered in. During this operation, the pH is kept constant using 32% sodium hydroxide solution. The pH is subsequently raised to pH=5.0 using 32% sodium hydroxide solution, and the mixture is stirred for a further 15 minutes. The pigment is filtered off, washed with demineralised water and dried at 110 C. for 16 h. 15 g of the product are calcined at 820 C. for 30 min., giving a slightly greenish gold pigment having an intense colour, high hiding power and strong lustre.

Example 2: Al2O3 Flake+TiO2/Fe2O3+SnO2+TiO2/Fe2O3

(2) 100 g of Al.sub.2O.sub.3 flakes of particle size 5-40 m are heated to 75 C. in 1.5 l of demineralised water. When this temperature has been reached, 460 g of a mixed solution of 167 g of TiCl.sub.4 solution (30% by weight of TiCl.sub.4), 222 g of FeCl.sub.3 solution (14% of Fe), 6.6 g of AlCl.sub.36 H.sub.2O and 101 g of demineralised water are slowly metered in with vigorous stirring. The pH is kept constant at pH 2.6 using 32% sodium hydroxide solution. After addition of this solution, the pH is lowered to pH=1.8 using hydrochloric acid (18% of HCl), and 805 g of an SnCl.sub.4 solution (2% by weight of SnCl.sub.4) stabilised with concentrated hydrochloric acid are metered in at this pH over the course of 300 minutes. The pH is then raised to 2.6 using 32% sodium hydroxide solution, and 760 g of a mixed solution of 306 g of TiCl.sub.4 solution (30% by weight of TiCl.sub.4), 399 g of FeCl.sub.3 solution (14% of Fe), 11.8 g of AlCl.sub.36 H.sub.2O and 224 g of demineralised water are slowly metered in. During this operation, the pH is kept constant using 32% sodium hydroxide solution. The pH is subsequently raised to pH=5.0 using 32% sodium hydroxide solution, and the mixture is stirred for a further 15 minutes. The pigment is filtered off, washed with demineralised water and dried at 110 C. for 16 h. 15 g of the product are calcined at 850 C. for 30 min., giving a strongly greenish gold pigment having an intense colour, high hiding power and strong lustre.

Example 3: Glass Flake+SiO2+TiO2/Fe2O3+SnO2+TiO2/Fe2O3

(3) 150 g of calcium aluminium borosilicate flakes of particle size 20-200 m are heated to 75 C. in 1.5 l of demineralised water. When this temperature has been reached, the pH is adjusted to pH 9.0, and 110.8 g of Na.sub.2SiO.sub.3 solution (13.75% of SiO.sub.2) are metered in over the course of 50 minutes with vigorous stirring. During this operation, the pH is kept constant using hydrochloric acid (18% of HCl). The pH is then lowered to 2.6, and 250 g of a mixture of 197 g of FeCl.sub.3 solution (14.2% of Fe), 148 g of TiCl.sub.4 solution (32% of TiCl.sub.4) and 6.1 g of AlCl.sub.3 solution (29% of AlCl.sub.3) are metered in over the course of 60 minutes. The pH is subsequently lowered 1.8, and a mixture of 25.9 g of SnCl.sub.4 solution, 66 g of hydrochloric acid (37% of HCl) and 500 g of DI water is metered in over the course of 200 min. The pH is subsequently raised to 2.6 again, and 285 ml of a mixture of 197 g of FeCl.sub.3 solution (14.2% of Fe), 148 g of TiCl.sub.4 solution (32% of TiCl.sub.4) and 6.1 g of AlCl.sub.3 solution (29% of AlCl.sub.3) are metered in over the course of 350 minutes. The pH is in each case kept constant using sodium hydroxide solution (32%). The pH is subsequently raised to pH=5.0 using 32% sodium hydroxide solution, and the mixture is stirred for a further 15 minutes. The pigment is filtered off, washed with demineralised water and dried at 110 C. for 16 h. 15 g of the product are calcined at 650 C. for 30 min., giving a gold pigment having an intense colour and strong glitter effect.

Example 4: SiO2 Flake+TiO2/Fe2O3+SnO2+TiO2/Fe2O3

(4) 100 g of SiO.sub.2 flakes of particle size 10-60 m are heated to 75 C. in 2 l of demineralised water. When this temperature has been reached, 415 g of a mixed solution of 178 g of TiCl.sub.4 solution (30% by weight of TiCl.sub.4), 237 g of FeCl.sub.3 solution (14% of Fe), 7.0 g of AlCl.sub.36 H.sub.2O and 117 g of demineralised water are slowly metered in with vigorous stirring. The pH is kept constant at pH 2.6 using 32% sodium hydroxide solution. After addition of this solution, the pH is lowered to pH=1.8 using hydrochloric acid (18% of HCl), and 750 g of an SnCl.sub.4 solution (2 w.-% of SnCl.sub.4) stabilised with concentrated hydrochloric acid are metered in at this pH over the course of 300 minutes. The pH is then raised to 2.6 using 32% sodium hydroxide solution, and 660 g of a mixed solution of 218 g of TiCl.sub.4 solution (30% by weight of TiCl.sub.4), 289 g of FeCl.sub.3 solution (14% of Fe), 8.6 g of AlCl.sub.36 H.sub.2O and 145 g of demineralised water are slowly metered in. During this operation, the pH is kept constant using 32% sodium hydroxide solution. The pH is subsequently raised to pH=5.0 using 32% sodium hydroxide solution, and the mixture is stirred for a further 15 minutes.

(5) The pigment is filtered off, washed with demineralised water and dried at 110 C. for 16 h. 15 g of the product are calcined at 850 C. for 30 min., giving a gold pigment having an intense colour and strong lustre.

Example 5: Mica Flake+TiO2+TiO2/Fe2O3+SnO2+TiO2/Fe2O3

(6) 100 g of mica flakes (thickness: 100-500 nm, D.sub.50=15-30 m) are heated to 75 C. in 1.5 l of demineralised water. When this temperature has been reached, the pH is adjusted to pH 2.2 using hydrochloric acid (18% of HCl), and 22 g of TiCl.sub.4 solution (32% of TiCl.sub.4) are metered in over the course of 20 minutes with vigorous stirring. During this operation, the pH is kept constant using hydrochloric acid (18% of HCl). The pH is then increased to 2.6 using sodium hydroxide solution (32% of NaOH), and 552 g of a mixture of 236 g of FeCl.sub.3 solution (14.2% of Fe), 178 g of TiCl.sub.4 solution (32% of TiCl.sub.4) and 7.3 g of AlCl.sub.3 solution (29% of AlCl.sub.3) are metered in over the course of 250 min. The pH is subsequently lowered 1.8, and a mixture of 34.6 g of SnCl.sub.4 solution (50% of SnCl.sub.4), 90 g of hydrochloric acid (37% of HCl) and 680 g of DI water is metered in over the course of 200 minutes. The pH is subsequently raised to 2.6 again using hydrochloric acid (18% of HCl), and 342 ml of a mixture of 236 g of FeCl.sub.3solution (14.2% of Fe), 178 g of TiCl.sub.4 solution (32% of TiCl.sub.4) and 7.3 g of AlCl.sub.3 solution (29% of AlCl.sub.3) are metered in over the course of 160 min. The pH is in each case kept constant using sodium hydroxide solution (32%). The pH is subsequently raised to pH=5.0 using 32% sodium hydroxide solution, and the mixture is stirred for a further 15 minutes. The pigment is filtered off, washed with demineralised water and dried at 110 C. for 16 h. 15 g of the product are calcined at 820 C. for 30 min., giving a gold pigment having an intense colour and strong glitter effect.

Comparative Example

(7) Analogously to Example 1 of CN 101289580A), 100 g of synthetic mica are coated with TiO.sub.2+Fe.sub.2O.sub.3/TiO.sub.2+SnO.sub.2+TiO.sub.2.

(8) 100 g of fluorophlogopite flakes of particle size 10-40 m are heated to 85 C. in 1.6 l of demineralised water. When this temperature has been reached, the pH is lowered to 2.3 using hydrochloric acid (18 w.-% of HCl), and 541.4 g of a 32% TiCl.sub.4 solution are metered in over the course of 290 min. with vigorous stirring. During this operation, the pH is kept constant using sodium hydroxide solution (20 w.-%).

(9) The pH is subsequently raised to 4.0 using sodium hydroxide solution, and a mixture of 172 g of FeCl.sub.3 solution (14.2% of Fe) 34.9 g of TiCl.sub.4 solution (32% of TiCl.sub.4) and 118 g of DI water is metered in over the course of 75 min. The pH is kept constant at pH 4.0 using 20% sodium hydroxide solution. The pH is subsequently lowered to pH=1.2 using hydrochloric acid (18% of HCl) and then raised to pH 1.5 using sodium hydroxide solution (20%). At this pH, a solution of 32.1 g of SnCl.sub.4 (50 w.-% of SnCl.sub.4) and 82.4 g of hydrochloric acid (32% of HCl) in 622.4 g of DI water is metered in over the course of 240 minutes. The pH is then raised to 2.3 using 32% sodium hydroxide solution, and 482 g of TiCl.sub.4 solution (32% of TiCl.sub.4) are metered in over the course of 300 minutes. During this operation, the pH is kept constant using 32% sodium hydroxide solution. The pH is subsequently raised to pH=5 using 32% sodium hydroxide solution, and the mixture is stirred for a further 15 minutes.

(10) The product is filtered off, washed with DI water and dried at 110 C. for 10 h. 15 g of the product is calcined at 820 C. for 0.5 h, giving a bronze-coloured powder.

(11) Colour Measurements:

(12) The following table shows the Lab values determined by colour measurement and the C* values (CIE-L*a*b* standard colour value system). The C* value is a direct measure of the chroma. The measurements are carried out using an ETA photometer (manufacturer: STEAG ETA-OPTIK GmbH).

(13) TABLE-US-00001 TABLE 1 Pigment 75/95 black background Chroma L* a* b* C* Example 1 142.9 2.0 117.0 117.0 Example 2 144.5 16.8 104.6 105.9 Comparative 131.1 15.9 49.8 52.3 Example (CN 101289580 A)

(14) The pigments according to the invention in accordance with Examples 1 and 2 exhibit significantly higher C* values compared with the comparative example.

USE EXAMPLES

Example A1: Automobile Paint

(15) The pigment powders can easily be incorporated into automobile paints. To this end, the pigment is added to the paint base with stirring. The stirring operation is continued until the pigment has uniformly distributed in the paint. The coloured paint is sprayed onto black- and white-coated aluminium test sheets.

(16) Production of the Paint Sheets:

(17) Paint: Herberts 419982 base coat Pigmentation: 5% of the pigment from Example 1 Dry layer thickness: 15 m Spray gun: Sprimag S 233, nozzle diameter 1.5 mm Spray pressure: 4 bar Nozzle-substrate separation: 27 cm

Example A2: Flexographic Printing

(18) Preparation of the Printing Ink:

(19) The multilayered pigment from Example 4 is pre-wetted with Byk 348 pre-wetting (0.6%) and incorporated into the binder in a concentration of 22.9%.

(20) Binder: Koustom Kote 9000/USA, water-based

(21) The paste is diluted with water until a viscosity of 40 sec with the 4 mm Erichsen cup at 25 C. reached.

(22) The pigments are printed onto matt-black art printing paper using a ceramic anilox cylinder (24 ccm/m.sup.2) via a rubber printing plate.

(23) The pigments according to the invention exhibit a very strong colour and glitter effect.

Example A3: Screen Printing

(24) The pigment concentration can be varied greatly here depending on the desired effect.

(25) Suitable binders are both aqueous and also solvent-containing systems. For areas exposed to daylight, the addition of a UV protection, such as, for example, benzotriazoles or HALS, is advisable in order to increase the durability of the coating.

(26) The screen printing fabric is selected depending on the particle size of the pigment employed. Thus, for example, for the pigment particle fraction of 5-40 m, a screen mesh width of 61-64 has proven successful (wires/cmwire diameter).

(27) Suitable substrates are a large selection of surfacesthe most important materials are fabrics, films, cardboard and papers or wallpapers.

Use Example

(28) 15% of pigment from Example 1 Binder: Prll Aqua Jet FGL M 093:85% Screen fabric 61-64 Optionally dilution with water Laboratory experiment: 50-150 g of ink Substrate: Luxo Satin 250 g/m.sup.2 (manufacturer Papyrus).

Example A4: Automobile Paint

(29) The pigment powders can easily be incorporated into automobile paints. To this end, the pigment is added to the paint base with stirring. The stirring operation is continued until the pigment has uniformly distributed in the paint. The coloured paint is sprayed onto black- and white-coated aluminium test sheets.

(30) Production of the Paint Sheets:

(31) Paint: Herberts 419982 base coat Pigmentation: 5% of the pigment from Example 5 Dry layer thickness: 15 m Spray gun: Sprimag S 233, nozzle diameter 1.5 mm Spray pressure: 4 bar Nozzle-substrate separation: 27 cm