Bayer Aktiengesellschaft

Joseph Pedain

Wilhelm Thoma

Harro Traubel

Walter Schroer

Karl-Arnold Weber

Karl H Pisaric

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.

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Cologne, Germany

Joseph Pedain