TWO-COMPONENT COATING COMPOSITIONS

• Main Authors: HUYBRECHTS, JOZEF THERESIA, VAES, ANN
• Format: Patent
• Language: English; French
• Published: 03.05.2011
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS THEREFOR; WOODSTAINS

The invention is directed to two-component coating composition comprising A) at least one hydroxy-functional (meth)acrylic copolymer having an OH value from 160 to 200 mg KOH/g and a weight average molecular weight Mw from 2,500 to 30,000 and B) at least one polyisocyanate cross-linking agent; wherein the hydroxy-functional (meth)acrylic copolymer A) is obtained by AI) free-radically copolymerizing a monomer mixture comprising a) at least one hydroxy functional free-radically copolymerizable olefinically unsaturated monomer, b) at least one cycloaliphatic ester of a free-radically copolymerizable olefinically unsaturated carboxylic acid and c) at least one additional free-radically copolymerizable olefinically unsaturated monomer which is different from component a) and b) and AII) reacting at least part of the hydroxyl groups of the hydroxy-functional (meth)acrylic copolymer obtained in step AI) with d) at least one lactone compound: wherein the hydroxy-functional (meth)acrylic copolymer obtained in step AI) has a glass transition temperature Tg of at least 50° C and wherein said copolymer is free of epoxy-functional free-radically copolymerizable olefinically unsaturated monomers.