Aqueous polyisocyanate dispersions
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United States of America Patent
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Feb 14, 1995
Grant Date -
N/A
app pub date -
May 25, 1990
filing date -
May 25, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is directed to an aqueous polyisocyanate dispersion which has an isocyanate content of at least 0.5% by weight, based on the weight of the polyisocyanate, and is prepared by a) dispersing in water a polyisocyanate which has an isocyanate content of at least 12% by weight and is rendered hydrophilic by reaction with a compound containing a lateral or terminal nonionic hydrophilic group and b) chain extending the dispersed polyisocyanate with a primary or secondary monoamine containing at least one hydroxyl group in an amount sufficient to provide an equivalent ratio of amino groups to isocyanate groups of 0.6:1.0 to 0.95:1.0.
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