Patent ID: 8980976
Filing Date: 2015-03-17
Classification: C01P,C09B,C09C

Abstract:
1. Pearlescent pigments comprising a coating and a platelet-shaped transparent substrate that includes a platelet-shaped transparent core comprised of a material selected from a group consisting of mica, talc, sericite, kaolin, SiO 2 , glass, graphite, Al 2 O 3 , and mixtures thereof, wherein the coating comprises at least one mixed inorganic/organic layer, said mixed layer comprising at least in part an inorganic network having one or more inorganic oxide component(s) and at least one organic component, and the organic component is, at least in part, at least one of an organic oligomer and a polymer which is covalently bonded, at least in part, to the inorganic network via one or more organic network formers, wherein the inorganic network and the organic oligomers and/or polymers exhibit interpenetration, wherein said coating is produced by applying a coating composition to platelet-shaped transparent substrates, wherein said coating composition is formed by causing at least one inorganic network former and at least one organic network former and at least one reactive organic component to react in a liquid phase, wherein the at least partial covalent bonding of the inorganic oxide component and organic oligomer and/or polymer takes place, at least in part, via one or more organic network formers, said organic network former having the general formula (II) in which the organometallic compound has at least one hydrolyzable group X, following the hydrolysis of which a covalent bond forms between the organic network former and the inorganic network, at least one organic radical R 1 , which stands for a reactive organic group that covalently bonds to the at least one of an organic oligomer and a polymer, and R 2 and R 3 independently denote an organic group that covalently bonds to the at least one of an organic oliqomer and a polymer, or R 2 and R 3 independently of one another are non-reactive, where k is the formal oxidation number of M, M stands for Al, Zr, or Ti, n is an integer from 1 to (k−1), m is an integer from 0 to (k−2), o is an integer from 0 to (k−2), and where n+m+o is an integer from 1 to (k−1).