Pressurized, blowing agent-containing isocyanate semiprepolymer mixtures based on lignin-polyether polyols and their use for producing polyurethane foams

US5834529A · kind A · utility

Assignee

• Elastogran GmbH · DE

Inventors

• Hans-Juergen Reese · Olching, DE
• Franz Heimpel · Affing, DE
• Heinz Forster · Wuppertal, DE

Key dates

• Filing date: Nov 6, 1995
• Grant date: Nov 10, 1998
• Expiry date: Nov 6, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/6696
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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.