Patent ID: 9228049
Filing Date: 2016-01-05
CPC Classification: A61L,C08G

Claim Text:
1. A method for producing hydrophilic aliphatic polyurethane foam which comprises I) preparing an isocyanate-functional prepolymer A) by reacting using a molar excess of low molecular weight aliphatic diisocyanate A1), II) at least partly removing the unreacted excess of low molecular weight aliphatic diisocyanate A1), III) obtaining a mixture of step III of low molecular weight aliphatic diisocyanate A1) with the isocyanate-functional prepolymer A), the free low molecular weight aliphatic diisocyanate content of said mixture of step III being 2.0 to 15 weight %, IV) preparing a mixture of step IV by mixing the mixture of step III) with C8- to C22-monocarboxylic acid or their ammonium or alkali metal salt or C12- to C44-dicarboxylic acid or their ammonium or alkali metal salt B) and water C), and V) foaming and curing the mixture of step IV) to prepare a polyurethane foam.