Use of coated metallic luster pigments for pigmenting high molecular weight materials

Abstract

Use of luster pigments based on a platelet-shaped metallic substrate coated with a low refractive dielectric layer which does not absorb visible light, for pigmenting macromolecular materials.

1 . A silver-colored luster pigment, comprising:
 a platelet-shaped aluminum substrate; and   a coating provided on all sides of the aluminum substrate;   wherein the coating consists of:   a low refractive dielectric layer that does not absorb visible light formed directly on the aluminum substrate, the layer consisting essentially of at least one of silicon dioxide and silicon oxide hydrate; and   an optional colorless outer layer.   
     
     
         2 . The silver-colored luster pigment according to  claim 1 , wherein the dielectric layer has a refractive index n<1.8. 
     
     
         3 . The silver-colored luster pigment according to  claim 1 , wherein the dielectric layer has a thickness of from 100 to 800 nm. 
     
     
         4 . A composition comprising a thermoset or thermoplastic pigmented with the silver-colored luster pigment according to  claim 1 . 
     
     
         5 . The composition according to  claim 4 , wherein the thermoset or thermoplastic is selected from the group consisting of polyethylene (PE), polypropylene (PP), polyisobutene (PIB), polyvinyl chloride (PVC), polyvinylidene difluoride (PVDF), polycarbonate (PC), polycarbonate-polyester blends, polyethylene terephthalate (PET), polyethylene naphthenate (PEN), polybutylene terephthalate (PBT), polystyrene (PS), acrylate-butadiene-styrene (ABS) copolymers, styrene-acrylonitrile (SAN) copolymers, polymethyl (meth)acrylate (PM(M)A), polybutyl (meth)acrylate (PB(M)A), polyamides, polyethers, polyphenylene ethers, polyether sulfones, polyether ketones, polyphenylene sulfides, polyimides, polyetherimides, polyesterimides, polyoxymethylene, polyurethanes (PU, TPU), polymerizable casting resins based on styrene, acrylate or polyester, postcurable polycondensation resins based on melamine or epoxy and PVC and PU coating pastes.