Aqueous dispersions of blocked polyisocyanates
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United States of America Patent
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Mar 22, 1994
Grant Date -
N/A
app pub date -
Jul 23, 1991
filing date -
Jul 23, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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.
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