Method for the preparation of polyurethane elastomers
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United States of America Patent
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May 30, 2000
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N/A
app pub date -
Mar 10, 1998
filing date -
Mar 14, 1997
priority date (Note) -
Expired
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Abstract
A method for the production of polyurethane elastomers by reacting an isocyanate epolymer having an isocyanate content of from 5 to 10% by weight which is the reaction product of an excessive amount of a polyisocyanate containing at least 85% by weight of 4,4'-diphenylmethane diisocyanate or a variant thereof and a polyether polyol having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 500 to 3000, and an oxyethylene content of from 50 to 85% by weight, with an aqueous latex to form a foam, and compressing said foam.
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