Process for bonding lignocellulose-containing raw materials with a prepolymer based on a urethane-modified diphenylmethane diisocyanate mixture

US4546039A · kind A · utility

Assignee

• BASF SE

Inventors

• Heinrich Horacek · Puchenau, AT
• Otto Wittmann · Bischofswerda, DE
• Matthias Marx · Fürstenfeldbruck, DE
• Johann Mayer · Wernberg-Köblitz, DE

Key dates

• Filing date: Apr 27, 1983
• Grant date: Oct 8, 1985
• Expiry date: Apr 27, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31989
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for bonding lignocellulose raw materials using an isocyanate group-containing urethane-modified diphenylmethane diisocyanate mixture having a viscosity of 120 to 1000 mPas at 25.degree. C. and an isocyanate content of 15 to 33.6 percent by weight which is obtained by reacting a diphenylmethane diisocyanate mixture containing 10 to 75 percent by weight of 2,4'-diphenylmethane diisocyanate with 0.05 to 0.5 hydroxyl equivalents of a polyol per equivalent isocyanate group.