C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/153, 402/157
C08G 18/62 (2006.01) B27K 3/15 (2006.01) C04B 41/48 (2006.01) C08G 18/08 (2006.01) C08G 18/70 (2006.01) C08G 18/72 (2006.01) C09D 175/04 (2006.01)
Patent
CA 1331667
AN AQUEOUS COATING COMPOSITION BASED ON SPECIFIC TWO-COMPONENT POLYURETHANES AND TO A PROCESS FOR ITS PRODUCTION ABSTRACT OF THE DISCLOSURE The present invention is directed to A two-component coating composition which contains as binder components a) a polyol component containing at least one hydroxyl- containing polymer having chemically incorporated carboxylate and/or sulfonate groups and based on olefinically unsaturated compounds and b) a polyisocyanate component having a viscosity at 23°C of about 50 to 10,000 mPa.s and based on at least one organic polyisocyanate in quantities corresponding to an NCO/OH equivalent ratio of about 0.5:1 to 5:1, characterized in that component a) is an aqueous solution and/or dispersion of a polymer containing hydroxyl groups in which the polyisocyanate component b) is present in emulsified form. The present invention also relates to a process for the production of this coating composition which is characterized in that a polyisocyanate component having a viscosity at 23°C of about 50 to 10,000 mPa.s and based on at least one organic poly- isocyanate is emulsified in an aqueous solution or dispersion of one or more polymer resins containing hydroxyl groups and chemically incorporated sulfonate and/or carboxylate groups in a quantity which makes them soluble and/or dispersible in water, the quantitative ratios between the two components corresponding to an NCO/OH equivalent ratio, based on the isocyanate groups of the polyisocyanate component and the incorporated hydroxyl groups of the polymer component, of about 0.5:1 to 5:1.
608363
Gruber Hermann
Kubitza Werner
Probst Joachim
Aktiengesellschaft Bayer
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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