Preparation of polyurethane rigid foams

US5688835A · kind A · utility

Assignee

• BASF Elastogran GmbH · DE

Inventors

• Karin Scherbel · Schwarzheide, DE
• Katrin Ebert · Ebern, DE
• Hartmut Appenroth · Radeberg, DE
• Peter von Malotki · Cosel, DE

Key dates

• Filing date: Jan 25, 1996
• Grant date: Nov 18, 1997
• Expiry date: Jan 25, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2375/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for producing polyurethane rigid foams comprises reacting PA1 a) organic polyisocyanates PA1 b) relatively high molecular weight compounds containing at least two respective hydrogen atoms and, if desired, PA1 c) low molecular weight chain extenders and/or crosslinkers in the presence of PA1 d) blowing agents PA1 e) catalysts and, if desired, PA1 f) auxiliaries and additives, wherein the relatively high molecular weight compounds containing at least two reactive hydrogen atoms comprise a mixture of PA1 a1) one or more high-functional, polyether alcohols having functionalities of from 6 to 8 and mean equivalent masses of from 125 to 200, PA1 a2) one or more polyether alcohols based on aliphatic amines having functionalities of from 3 to 4 and mean equivalent masses of from 70 to 130, PA1 a3) one or more low-functional polyether alcohols having functionalities of from 2 to 3 and mean equivalent masses of from 67 to 250, and PA1 a4) an OH-containing fatty acid ester.