Method for Producing Water-Absorbing Polyurethane Foam
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United States of America Patent
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Issued Date -
May 7, 2009
app pub date -
Nov 7, 2007
filing date -
Nov 7, 2007
priority date (Note) -
Abandoned
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Abstract
A water-absorbing polyurethane foam is produced by reacting, foaming, and curing a raw material which includes aliphatic or alicyclic polyisocyanate, polyester polyol, a polyoxyethylene compound for a hydrophilizing agent, a catalyst and a blowing agent. Thus obtained water-absorbing polyurethane foam has a coating film made from a cured substance of the foam formed on both surfaces. The content of the polyoxyethylene compound in the raw material is 1 to 10 parts by mass with respect to 100 parts by mass in total of the polyester polyol and the polyoxyethylene compound. The raw material is reacted, foamed, and cured at a temperature of 40 to 130° C. The polyisocyanate has an isocyanate index of preferably 85 to 100.
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