Prepolymers
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United States of America Patent
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Apr 23, 2002
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N/A
app pub date -
Jan 21, 1997
filing date -
Dec 17, 1991
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Abstract
A prepolymer is provided having an NCO value of 5-30% by weight which is the reaction product obtained by reacting an excessive amount of a diphenylmethane diisocyanate containing at least 85% by weight of 4,4'-diphenylmethane diisocyanate or a variant thereof with a polyol composition comprising at least one poly(oxyethylene-oxyalkylene) polyol having an average nominal hydroxyl functionality of 2 to 6, an average hydroxyl equivalent weight of from 1000 to 3000 and an average oxyethylene content of from 50 to 85% by weight.
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