Process for the preparation of flexible polyurethane foams with improved resistance to hydrolysis and good die cutability

US4362825A · kind A · utility

Assignee

• BASF SE

Inventors

• Herbert Grabhoefer · Ludwigshafen, DE
• Peter Weyland

Key dates

• Filing date: Dec 24, 1981
• Grant date: Dec 7, 1982
• Expiry date: Dec 24, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/4219
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention concerns a process for the preparation of flexible polyurethane foams by reacting organic polyisocyanates, liquid polyester polyols having hydroxyl numbers of 40 to 80 and molecular weights of 1500 to 5000, which are produced by the polycondensation of organic dicarboxylic acids with either polyol mixture A, based on the overall polyol weight consisting of: PA1 5 to 50 percent by weight of 1,4-butanediol, PA1 20 to 60 percent by weight of 1,5-pentanediol, PA1 8 to 35 percent by weight of 1,6-hexanediol, PA1 2 to 15 percent by weight of at least one triol, and PA1 0 to 65 percent by weight of diethylene glycol, or polyol mixture B, based on the overall polyol weight consisting of: PA1 10 to 50 percent by weight of 1,4-butanediol, PA1 15 to 45 percent by weight of 1,6-hexanediol, PA1 15 to 65 percent by weight of diethylene glycol, and PA1 2 to 15 percent by weight of at least one triol, in the presence of catalysts and blowing agents as well as optionally chain extenders, auxiliaries and additives.