Pigment mixture

Abstract

The present invention relates to a pigment mixture based on spherical particles having a defined particle-size distribution, and to the use thereof in paints, coatings, printing inks, security printing inks, plastics, ceramic materials, glasses, in cosmetic formulations, as tracer, as filler and for the preparation of pigment preparations and dry preparations.

1 . A pigment mixture comprising at least two components A and B:
 component A is spherical base particles having a particle-size distribution D 90  of uncoated particles of 0.5-15 μm, said particles being coated on their surface firstly with TiO 2  and subsequently with SiO 2 , and   component B is spherical base particles having a particle-size distribution D 90  of uncoated particles of 0.5-15 μm, said particles being coated on the surface firstly with TiO 2  and subsequently with iron oxide or with a mixture of TiO 2  and iron oxide.   
     
     
         2 . The pigment mixture according to  claim 1 , wherein the spherical base particles are magnesium silicate, aluminium silicate, alkali-metal aluminium silicates, alkaline-earth metal aluminium silicates, SiO 2  spheres, glass beads, hollow glass beads, nylon, aluminium oxide beads, polymeric beads comprising ethylene-acrylic acid copolymers, ethylene-methacrylate copolymers, HDI-trimethylol hexyl lactone copolymers, nylon, polyacrylates, polymethyl methacrylate copolymers, polyethylene, polymethylsilsesquioxanes or mixtures thereof. 
     
     
         3 . The pigment mixture according to  claim 1 , wherein the spherical base particles of component A and/or B are SiO 2 . 
     
     
         4 . The pigment mixture according to  claim 1 , wherein the spherical particles of component A and component B each consist of SiO 2 . 
     
     
         5 . The pigment mixture according to  claim 1 , wherein the iron oxide of component B is Fe 2 O 3 . 
     
     
         6 . The pigment mixture according to  claim 1 , wherein component A is coated on the surface with TiO 2  in anatase modification. 
     
     
         7 . The pigment mixture according to  claim 1 , wherein the TiO 2  layer of component A has a layer thickness of 10-500 nm. 
     
     
         8 . The pigment mixture according to  claim 1 , wherein the SiO 2  layer of component A has a layer thickness of 10-500 nm. 
     
     
         9 . The pigment mixture according to  claim 1 , wherein component B is coated on the surface with TiO 2  in anatase modification. 
     
     
         10 . The pigment mixture according to  claim 1 , wherein the TiO 2  layer of component B has a layer thickness of 50-400 nm. 
     
     
         11 . The pigment mixture according to  claim 1 , wherein the iron oxide layer of component B has a layer thickness of 5-300 nm. 
     
     
         12 . The pigment mixture according to  claim 1 , wherein the mixture of TiO 2  and iron oxide of component B has a layer thickness of 55-700 nm. 
     
     
         13 . The pigment mixture according to  claim 1 , wherein components A and B are mixed in a weight ratio of 99:1 to 90:10. 
     
     
         14 . The pigment mixture according to  claim 1 , wherein component A and/or component B additionally has an outer protective layer in increasing light, temperature or weather stability compared to pigment without said layer. 
     
     
         15 . A process for the preparation of the pigment mixture according to  claim 1 , comprising covering the spherical particles of components A and B with one or more coatings by wet-chemical coating or by a CVD or PVD process, and component A and component B are subsequently mixed with one another. 
     
     
         16 . In paints, coatings, printing inks, security printing inks, plastics, ceramic materials, glasses, in cosmetic formulations, tracers, fillers or dry preparations comprising a pigment, the improvement wherein the pigment comprises a pigment of  claim 1 . 
     
     
         17 . A formulation comprising the pigment mixture according to  claim 1 , and at least one absorbent, astringent, antimicrobial substance, antioxidant, antiperspirant, antifoaming agent, antidandruff active compound, antistatic, binder, biological additive, bleach, chelating agent, deodorizer, emollient, emulsifier, emulsion stabilizers, dye, humectant, film former, filler, fragrance, flavor, insect repellent, preservative, anticorrosion agent, cosmetic oil, solvent, oxidant, vegetable constituent, buffer substance, reducing agent, surfactant, propellant gas, opacifier, UV filter, UV absorber, denaturing agent, viscosity regulator, perfume or vitamin.