Abstract: Pressurized, blowing agent-containing isocyanate semiprepolymer mixtures advantageously having an isocyanate content of from 5 to 25% and based on organic polyisocyanates and alkoxylated lignin having a hydroxyl number of from 30 to 80, preferably in admixture with lignin-free polyhydroxyl compounds are used for producing single-component polyurethane foams.
Type:
Grant
Filed:
November 6, 1995
Date of Patent:
November 10, 1998
Assignee:
Elastogran GmbH
Inventors:
Hans-Juergen Reese, Franz Heimpel, Heinz Forster
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