Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1988-12-05
1990-01-23
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
528 59, 528 60, 528 61, 528 64, C08G 1814
Patent
active
048958832
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.
REFERENCES:
patent: 3475266 (1969-10-01), Strassel
patent: 4108842 (1978-08-01), Konig et al.
patent: 4322327 (1982-03-01), Yoshimura et al.
Pedain Joseph
Pisaric Karl H.
Schroer Walter
Thoma Wilhelm
Traubel Harro
Bayer Aktiengesellschaft
Gil Joseph C.
Roy Thomas W.
Welsh Maurice J.
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