Metal effect pigments, method for the production and the use thereof and powder coating

US8304077B2 · kind B2 · utility

Assignees

• ECKART GmbH · DE
• BYK-CHEMIE GMBH · DE

Inventors

• Alfred Bubat · Xanten, DE
• Wolfgang Griesel · Wesel, DE
• Phu Qui Nguyen · Rheydt, DE
• Hans-Jorg Kremitzl · Eckental, DE

Key dates

• Filing date: Jul 8, 2009
• Grant date: Nov 6, 2012
• Expiry date: Aug 18, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2995
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Metallic effect pigments with a platelet-shaped metallic substrate. The pigments have at least one metal oxide layer. Covalently bonded to the surface of the metal oxide layer is a polysiloxane of formula I:where R1 is a saturated or unsaturated, straight-chain or branched alkyl radical having 1 to 30 carbon atoms and/or an aryl radical, alkylaryl radical or arylalkyl radical having 6 to 30 carbon atoms; R2, R3, R4 and R5 independently of one another are saturated or unsaturated, straight-chain or branched alkyl radicals having 1 to 6 carbon atoms and/or aryl radicals, alkylaryl radicals and/or arylalkyl radials having 6 to 12 carbon atoms; x=1 to 200, y=2 to 30; A is (CH2)n, O, S, (OCH2CH2)m or C6R64, where n=0 or 1 and m=0 to 30 and R6 is H and/or alkyl having 1 to 6 carbon atoms; B is (CH2)z or (OCH2CH2)w, z=0 to 30 and w=0 to 30; and R7 and R8 independently of one another are O or a saturated or unsaturated, straight-chain or branched alkyl radical having 1 to 6 carbon atoms and/or an aryl radical, alkylaryl radical or arylalkyl radical having 6 to 9 carbon atoms, where X is O or OH and is attached to the pigment surface. The disclosure further relates to a method for producing…