C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 75/06 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/66 (2006.01) C09D 175/06 (2006.01)
Patent
CA 2059420
Mo-3719 LeA 28,165 AQUEOUS BINDER COMPOSITION AND A PROCESS FOR ITS PREPARATION ABSTRACT OF THE DISCLOSURE This invention relates to an aqueous binder composition containing A) an aqueous solution or dispersion of an organic polyol component which can be diluted with water and contains at least one polyester resin containing urethane, carboxylate and hydroxyl groups and B) a polyisocyanate component which has a viscosity of 50 to 10,000 mPa.s at 23°C and contains at least one organic polyisocyanate which is present as an emulsion in component A), wherein the NCO/OH equivalent ratio, based on the isocyanate groups of component B) and the hydroxyl groups of the polyol component present in A), is 0.5:1 to 5:1. The invention also relates to a process for the preparation of these coating compositions by emulsifying a polyisocyanate component having a viscosity of 50 to 10,000 mPa.s at 23°C and containing at least one organic polyisocyanate in an aqueous solution or dispersion of a polyester resin containing urethane, carboxylate and hydroxyl groups in an sufficient to provide an an NCO/OH equivalent ratio, based on the isocyanate groups of the polyisocyanate component and the hydroxyl groups of the polyester resin, of 0.5:1 to 5:1.
Blum Harald
Hoehlein Peter
Kubitza Werner
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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