Polyurethane ureas

US4895883A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Joseph Pedain · Cologne, DE
• Karl H. Pisaric · Pulheim, DE
• Walter Schroer · Leverkusen, DE
• Wilhelm Thoma · Leverkusen, DE
• Harro Traubel · Leverkusen, DE
• Karl-Arnold Weber · Leverkusen, DE

Key dates

• Filing date: Dec 5, 1988
• Grant date: Jan 23, 1990
• Expiry date: Dec 5, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2150/50
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention is directed to polyurethane ureas which may be obtained by the reaction of a hydrophilic NCO prepolymer, which has been prepared from a polyhydroxy component based on about 9 to 100% by weight of a polyether containing about 30 to 100% by weight of ethylene oxide, or a mixture of this hydrophilic NCO prepolymer and a hydrophobic NCO prepolymer, the mixture containing .gtoreq.30% by weight of the hydrophilic prepolymer, with an aldimine or ketimine-containing hardener mixture in the presence of water and organic solvents, approximately 30 to 70% of the NCO groups of the prepolymers being reacted with the amino groups of the hardener and the remainder reacting with water. The present invention is also directed to a process for the preparation of these polyurethane ureas and to coated substrates prepared from these polyurethane ureas.