Patent ID: 8772371
Filing Date: 2014-07-08
Classification: C01P,C08K,C09C,C09D

Abstract:
1. A pearlescent pigment comprising a platelet-shaped substrate, a metal oxide coating comprising: a metal oxide layer having a refractive index of greater than 1.8; and a protective layer, wherein the protective layer comprises a metal oxide/hydroxide layer and optionally boroxide, applied to which is an organic aftercoat of an acrylic copolymer, wherein the metal oxide/hydroxide of the protective layer is selected from oxides/hydroxides of silicon (silicon oxide, silicon oxide hydrate), aluminium, zirconium, magnesium, calcium, iron(III), yttrium, cerium, zinc and combinations thereof, and wherein the acrylic copolymer comprises as copolymerized units the following monomers (A) an ethylenically unsaturated monomer containing at least one amino group; (B) an ethylenically unsaturated monomer containing no amino group; (C) optionally a hydroxy- or alkoxyalkyl(meth)acrylate of the formula (D) a (poly)alkyleneglycolmono(meth)acrylate of the formula wherein R