Patent ID: 6245825
Filing Date: 2001-06-12
Classification: C08G,Y10S

Abstract:
A method for the preparation of flexible polyurethane foams comprising reactinga polyisocyanate having at least 85% by weight of 4,4'-diphenylmethane diisocyanate with a polyoxyalkylene polyol (1) having an average hydroxyl equivalent weight of from 1000 to 3000, an average nominal hydroxyl functionality of from 2 to 6 and an average oxyethylene content of from 50% to 85% by weight withan optional polyol (2), wherein each polyol (2) that has an equivalent weight of 500 or more also has an oxyethylene content of at least 50% by weight,said polyol (1) is 85-100% by weight calculated on total weight of polyol (1) and an optional polyol (2),wherein the polyol (2) is 15 to 0% by weight calculated on total weight of polyol (1) and polyol (2),and using water as a foaming agent in an amount of 0.25% to 20% by weight based on total weight of the polyol (1) and the polyol (2).