Patent ID: 8197591
Filing Date: 2012-06-12
Classification: C01P,C09C,C09D,Y10T

Abstract:
1. A pearlescent pigment comprising a metal oxide-containing, platelet-shaped substrate and with a first and a second protective layer, wherein the metal oxide has a refractive index greater than 1.8, wherein a) the first protective layer comprises at least one metal oxide selected from the group consisting of cerium oxide, hydrated cerium oxide, cerium hydroxide and mixtures thereof, b) the second protective layer is comprised substantially of SiO c) the second protective layer has an organochemical aftercoat and the organochemical aftercoat comprises at least one α-silane bonded to the second protective layer by means of at least one oxygen atom, said α-silane having the formula in which 1≦n+m≦3; m=0 to 2; n=1 to 3 and R R Y is a functional binding group reactive with a binder system, and wherein the organochemical aftercoat comprises no silane not having a functional binding group.