Polyurethane-urea elastomers and their production

US4208507A · kind A · utility

Assignee

• BASF SE

Inventors

• Herbert Stutz · Karlsruhe, DE
• Karl H. Illers · Otterstadt, DE
• Ludwig Schuster · Schifferstadt, DE

Key dates

• Filing date: Jul 6, 1978
• Grant date: Jun 17, 1980
• Expiry date: Jul 6, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/10
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polyurethane-urea elastomers with improved temperature characteristics, in particular improved low temperature properties, good mechanical properties over a large temperature range and excellent resistance to hydrolysis, are obtained by reacting PA1 (A) a prepolymer, possessing cycloaliphatic NCO groups, which has been prepared from essentially difunctional polyhydroxy compounds and organic diisocyanates possessing at least one NCO group bonded to a cycloaliphatic structure, these reactants being used so as to give a ratio of total hydroxyl: NCO groups of from 1:1.2 to 1:10, with PA1 (B) 3,3',5,5'-tetramethyl-4,4'-diamino-diphenylmethane, A and B being reacted in the molar ratio of from 1:0.8 to 1:1.2.