C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/144, 400/740
C08G 18/68 (2006.01) C08G 18/08 (2006.01) C08G 18/36 (2006.01) C08G 18/80 (2006.01) C08L 75/06 (2006.01)
Patent
CA 1128245
ABSTRACT OF THE DISCLOSURE Aqueous dispersions of polyurethane polymers in ammonium salt form are prepared by reacting diisocyanates with a polyhydroxy, carboxylic acid to form an isocyanate-terminated prepolymer that is united with an unsaturated fatty acid ester polyol to provide carboxylic-containing, water-dispersible polyurethanes having properties exhibited by organic solvent- based, oil-modified polyurethanes. The aqueous dispersions can be formed by neutralization of "oil-modified," carboxylic group- containing, water-dispersible polyurethanes with ammonium salt- forming materials such as ammonia and amines. The aqueous dispersions are especially desirable coating compositions. An organic phosphite may be incorporated in the compositions to control the development if hardness in the films made from the aqueous dispersions and thereby avoid the formation of wrinkles in films that are made from the compositions.
346474
Rogemoser David R.
Williams Roy C.
Osler Hoskin & Harcourt Llp
Textron Inc.
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