C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 175/04 (2006.01) C08G 18/08 (2006.01) C08G 18/28 (2006.01) C08G 18/62 (2006.01) C08G 18/70 (2006.01) C08G 18/80 (2006.01) C08L 75/04 (2006.01)
Patent
CA 2090144
The present invention relates to water-borne coating compositions wherein the binder contains a mixture of a) a polyol component dispersed in water or a water/solvent mixture which contains at least one polymer prepared from olefinically unsaturated monomers and having a molecular weight (M n) of at least 500, at least two alcoholic hydroxyl groups per molecule, a hydroxyl value of 15 to 250 mg KOHg, an acid value of 0 to 7 mg KOH/g and a total content of sulfonate and carboxylate groups of 0 to 4.5 milliquivalents per 100 g of solid resin and b) a palyisocyanate component which is emulsified in the dispersion of polyol component a), has a viscosity at 23°C of 50 to 10,000 mPa.s and an average NCO functionality of 1.8 to 4.2, and contains 12.0 to 21.5% by weight of (cyclo)aliphatically bound isocyanate groups and, optionally, 2 to 20% by weight of ethylene oxide units present within polyether chains, the polyether chains containing a statistical average of 5 to 70 ethylene oxide units, wherein the components are present in quantities corresponding to an equivalent ratio of isocyanate groups of component b) to alcoholic hydroxyl groups of component a) of 0.2:1 to 5:1. The present invention also relates to a process for the production of these coating compositions and to coated water-resistant substrates prepared from these coating compositions.
Kubitza Werner
Laas Hans J.
Probst Joachim
Roschu Rolf
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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