C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 75/04 (2006.01) C07C 263/18 (2006.01) C08G 18/08 (2006.01) C08G 18/70 (2006.01) C08G 18/79 (2006.01) C08G 18/80 (2006.01)
Patent
CA 2072902
Mo3645 MD-91-17-CT AQUEOUS DISPERSIONS OF BLOCKED POLYISOCYANATES ABSTRACT OF THE DISCLOSURE The present invention is directed to a process for the preparation of an aqueous dispersion of a blocked polyisocyanate by reacting an aqueously dispersed polyisocyanate having an isocyanate content of at least 12% by weight, based on the weight of the polyisocyanate, with a monofunctional blocking agent which is more reactive with isocyanate groups than water at an equivalent ratio of monofunctional blocking groups to isocyanate groups of 0.5:1 to 2:1. The present invention is also directed to the aqueously dispersed blocked polyisocyanates prepared by this process and to compositions containing these polyisocyanates and an isocyanate-reactive compound. Mo3645
Rosthauser James W.
Tirpak Robin E.
Corporation Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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