Preparation of polyurethane ureas using as hardeners mixtures of water, amines, aldimines and ketimines

US4108842A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Eberhard Konig · Kronberg, DE
• Josef Pedain · Cologne, DE
• Karl-Arnold Weber · Leverkusen, DE
• Manfred Hajek · Leverkusen, DE

Key dates

• Filing date: Aug 5, 1977
• Grant date: Aug 22, 1978
• Expiry date: Aug 5, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/0852
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the production of polyurethane ureas from a prepolymer which contains isocyanate groups and a mixture of hardeners containing amino groups, in the presence of water, and optionally in the presence of solvents, characterized in that the mixture of hardeners comprises compounds corresponding to the following general formulae: EQU H.sub.2 N--R--NH.sub.2 (A) EQU h.sub.2 n--r--n .dbd. r.sub.1 (b) and EQU R.sub.1 .dbd. N--R--N .dbd. R.sub.1 (C) wherein PA0 R represents a divalent aliphatic, cycloaliphatic or araliphatic group having from 2 to 18 carbon atoms and optionally also containing --O-- or ##STR1## (wherein X represents H, --CH.sub.3, --C.sub.2 H.sub.5, --C.sub.3 H.sub.7 or --C.sub.4 H.sub.9) and PA0 R.sub.1 represents an aliphatic or cycloaliphatic group such as may be obtained by removal of the oxygen from a ketone or aldehyde having from about 2 to 8, preferably from about 3 to 6, carbon atoms, in which mixture the following molar ratios should be observed: PA1 A/b + c = from about 1:20 to 1:3, preferably from about 1:10 to 1:5; PA1 B/c = from about 1:2 to 2:1, preferably from about 1:1.5 to 1.5:1; and PA1 A + b + c/h.sub.2 o = fr…