Urethane polymers, polymer dispersions and half-esters...

Details Urethane polymers, polymer dispersions and half-esters... Urethane polymers, polymer dispersions and half-esters...

C - Chemistry, Metallurgy

07

C

402/143, 402/150

C07C 69/40 (2006.01) C07C 69/76 (2006.01) C08G 18/08 (2006.01) C08G 18/32 (2006.01)

Patent

CA 1140146

ABSTRACT OF THE DISCLOSURE Aqueous dispersions of oil-modified, carboxyl-containing, urethane polymers are prepared by reacting diisocyanates or their isocyanate-terminated prepolymers, with half-esters of hindered diols, especially 2,2,4-trimethyl-1,3-pentanediol, and anhydrides of polycarboxylic acids, preferably aromatic acids having at least three carboxylic groups, especially trimellitic anhydride. The urethane polymers are "oil-modified", i.e., extended with unsaturated fatty acid esterpolyols; and when neutralized with ammonia or amines can be dispersed in water to form especially desirable coating compositions. An organic phosphite may be incorporated in the compositions to control the development of hardness in films made from the aqueous dispersions and thereby avoid the formation of wrinkles in films that are made from the compositions.

351328

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