C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 175/12 (2006.01) C08G 18/08 (2006.01) C09D 175/06 (2006.01)
Patent
CA 2272759
The present invention relates to aqueous polyurethane-urea dispersions having a resin solids content of at least 35 wt.% and a pH of at least 7.5 which are prepared by a) forming an isocyanate-terminated prepolymer by reacting a difunctional polyol having a molecular weight of 500 to 6000, a low molecular weight alcohol, a diisocyanate and/or triisocyanate and an isocyanate-reactive compound which has an acid group, b) neutralizing 65% to 95% of the acid groups prior to dispersing the prepolymer in water, c) dispersing the neutralized prepolymer in water, d) chain extending the isocyanate groups with water to form a polyurethane-urea, and e) after completion of the chain extending reaction adding additional neutralizing agent to provide a total amount of neutralizing agent that is sufficient to neutralize at least 115% of the acid groups of component D), wherein the polyurethane-urea contains 1.0 to 4.0%, based on resin solids, of the isolated urea groups. The present invention also relates to a process for the preparation of these polyurethane-urea dispersions and to their use in coating compositions.
Blum Harald
Hovestadt Wieland
Kahl Lothar
Wicks Douglas A.
Aktiengesellschaft Bayer
Corporation Bayer
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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