Preparation of polyurethanes having improved curing

US6100308A · kind A · utility

Assignee

• BASF SE

Inventors

• Bernd Guettes · Sallgast, DE
• Stefan Dinsch · Schipkau, DE
• Gottfried Knorr · Schwarzheide, DE
• Holger Seifert · Bad Driburg, DE

Key dates

• Filing date: Jul 25, 1997
• Grant date: Aug 8, 2000
• Expiry date: Jul 25, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2110/0083
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polyurethanes having improved curing are prepared by reacting PA1 a) organic and/or modified organic diisocyanates and/or polyisocyanates with PA1 b) polyether polyols based on aromatic amines, able to be prepared by reacting specific amine combinations and, if desired, further coinitiators in a stage wise molecular addition of alkylene oxide, and also, if desired, further relatively high molecular weight compounds containing at least two reactive 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) further auxiliaries and/or additives, wherein the specific amine combination used is a mixture of amines of the diphenylmethane series consisting of from 5 to 20% by weight of 4-ring amine, from 15 to 30% by weight of 3-ring amine, from 20 to 35% by weight of amines having more than 4 rings and from 25 to 50% by weight of 2-ring amine, wherein the proportions add up to 100% by weight, in combination with further aromatic amines.