Aqueous polyurethane gel, process for producing the same, and use thereof
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United States of America Patent
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Mar 4, 2003
Grant Date -
Sep 26, 2002
app pub date -
Dec 19, 2001
filing date -
Apr 25, 2000
priority date (Note) -
Expired
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Abstract
The present invention provides a polyurethane hydrogel prepared by crosslinking and curing a terminal isocyanate-containing polyurethane resin (C) in the presence of water at a water:resin (C) weight ratio of more than 9:1, the resin (C) being a reaction product of a polyisocyanate (A) and a liquid polyol (B), and the polyol (B) containing 70 wt. % or more of a random copolymer prepared by copolymerization of ethylene oxide (a) and propylene oxide (b) at an ethylene oxide (a): propylene oxide (b) weight ratio of 50:50 to 90:10. The present invention further provides a production process and use of the polyurethane hydrogel.
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