Process for making hydrophilic polyurethane foams

Claim 1

In a process for producing a hydrophilic polyurethane foam which comprises reacting an organic polyisocyanate, an organic compound which contains at least two active hydrogen atoms in a mixture containing a blowing agent, the improved process of producing a hydrophilic polyurethane which comprises including in the reaction mixture from about 2 to about 10% by weight based on the weight of said organic compound of an alkyl aryl sulphonic acid which is soluble in said organic compound wherein said alkyl aryl sulphonic acid has the formula R.sub.n --Ar--[--SO.sub.3 H].sub.m wherein Ar represents a C 6 -C 14 arylene group, R represents an alkyl group of 2-20 carbon atoms with the proviso that the total number of carbon atoms of all alkyl groups is from 4 to 40 carbon atoms, n in an integer of 1 to 4, and m is an integer from 1 to 3