PRESSURIZED, BLOWING AGENT-CONTAINING ISOCYANATE SEMIPREPOLYMER MIXTURES BASED ON LIGNIN-POLYETHER POLYOLS AND THEIR USE FOR PRODUCING POLYURETHANE FOAMS

摘要

Pressurized, blowing agent-containing isocyanate semiprepolymer mixtures advantageously having an isocyanate content of from 5 to 25 percent 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.