Patent ID: 7875112
Filing Date: 2011-01-25
Classification: C01P,C09C,Y10T

Abstract:
1. Surface-modified effect pigments based on flake-form substrates, which are sheathed with one or more layers of immobilised LCST polymer such that the LCST polymer does not form a chemical bond with the effect pigments, wherein said surface-modified effect pigments based on flake-form substrates are holographic pigments, pearlescent pigments, interference pigments, multilayered pigments, metal-effect pigments, goniochromatic pigments and/or BiOCl pigments; or which are sheathed with one or more layers of immobilised LCST polymer, wherein the LCST polymer is a polysiloxane modified with olefinic groups, wherein said surface-modified effect pigments based on flake-form substrates are holographic pigments, pearlescent pigments, interference pigments, multilayered pigments, metal-effect pigments, goniochromatic pigments and/or BiOCl pigments, which surface-modified effect pigments are prepared by applying the LCST polymer to the surface of the effect pigments by precipitation in water and/or an organic solvent, and irreversibly immobilizing said LCST polymer on the surface of the effect pigments.