Polyoxypropylene-polyols and polyoxypropylene-polyoxyethylene-polyols containing hydroxyl groups

US5340916A · kind A · utility

Assignee

• BASF SE

Inventors

• Rolf Henn · Ketsch, DE
• Werner Hinz · Bischofswerda, DE
• Ludwig Schuster · Schifferstadt, DE
• Klaus Vorspohl · Stockach, DE

Key dates

• Filing date: Oct 26, 1992
• Grant date: Aug 23, 1994
• Expiry date: Oct 26, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S521/902
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the preparation of a hard foam containing urethane groups or urethane and isocyanurate groups by the polyisocyanate polyaddition process, by reacting PA0 a) a polyoxypropylene- or polyoxyethylene-polyoxypropylene-polyol containing secondary hydroxyl groups, having a functionality of from 3.5 to 4.3, a hydroxyl number of from 350 to 650 and a viscosity of from 500 to 2,500 mPa.multidot.s at 23.degree. C. and prepared by anionic polymerization of 1,2-propylene oxide or ethylene oxide and 1,2-propylene oxide onto an initiator molecule mixture containing, based on the total weight, PA1 a1) from 40 to 80% by weight of a hexanetetrol, PA1 a2) from 1 to 30% by weight of a hexanetriol, PA1 a3) from 0 to 35% by weight of glycerol and PA1 a4) from 0 to 15% by weight of sorbitol or mannitol, or a mixture thereof, PA0 b) optionally, a low-molecular-weight chain extender and/or crosslinking agent with PA0 c) an organic, modified or unmodified polyisocyanate; in the presence of PA0 d) a blowing agent, PA0 e) a catalyst and, optionally, PA0 f) assistants and/or additives, and novel polyoxypropylene-polyols and polyoxyethylene-polyoxypropylene-polyols…