PEARLESCENT PIGMENTS COATED WITH MIXED INORGANIC/ORGANIC LAYERS AND METHOD FOR THE PRODUCTION THEREOF

摘要

The invention relates to platelet-shaped pearlescent pigments that are coated with at least one mixed inorganic/organic layer for improving their application properties, and of these, particularly their mechanical properties, and to methods for the production thereof and to the use thereof. The said mixed inorganic/organic layer comprises at least one at least partially crosslinked inorganic metal-oxide component and an organic component. The organic component is at least one organic oligomer and/or polymer, which is covalently bonded, at least in part, to the inorganic network via network formers, wherein the coating comprises at least one mixed inorganic/organic layer, which mixed mixed layer comprises, at least in part, an inorganic network having one or more inorganic oxide component(s) and at least one organic component, the organic component being, at least in part, an organic oligomer and/or polymer covalently bonded, at least in part, to the inorganic network via one or more organic network formers. The invention also relates to a method for the production of such pearlescent pigments.

主权项

1. Pearlescent pigments comprising a coating and a platelet-shaped transparent substrate,
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 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 (I)
R1nR2mR3oSiX(4-n-m-o)  (I) in which X is a hydrolyzable group, following the hydrolysis of which a covalent bond can form between the organic network formers and the inorganic network, and R1 is a reactive organic group, which can be covalently bonded to the at least one of an organic oligomer and a polymer, R2 and R3 are independently an organic group, which can be covalently bonded to the at least one of an organic oligomer and a polymer, provided that n, m and o are integers, where n+m+o=1 to 3 and n=1 to 3, m=0 to 2 and o=0 to 2.