Patent ID: 9051471
Filing Date: 2015-06-09
Classification: A61K,A61Q,C01P,C09C,C09D

Abstract:
1. A weather-resistant pearlescent pigment which consists of a platelet-shaped substrate coated with one or more metal oxides, thereby forming a metal oxide layer, wherein the metal oxide layer has a refractive index greater than 1.8, the platelet-shaped substrate being selected from the group consisting of synthetic mica flakes, glass flakes, SiO 2 flakes, Al 2 O 3 flakes, synthetic boehmite flakes, BiOCl flakes and mixtures thereof, and a top layer, wherein the top layer consists of the following layers: a) a cerium-containing layer being applied directly to the metal oxide layer, the cerium-containing layer being selected from the group consisting of cerium oxide, cerium hydroxide, hydrated cerium oxide and mixtures thereof, and b) an organic-chemical compatibilizing layer being applied directly to the cerium-containing layer a), the organic-chemical compatibilizing layer comprising the reaction product(s) of one or more oligomeric silane(s), wherein the oligomeric silane(s) have one or more amino groups; and wherein the organic-chemical compatibilizing layer is essentially free of a separate layer of SiO