Water-dispersible urethane polymers, aqueous polymer dispersions

Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters

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560 89, 560 91, 560198, 560199, C07C 6976

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active

043294901

ABSTRACT:
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.

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patent: 3983058 (1976-09-01), Hirooka et al.
patent: 4094838 (1978-06-01), Schneider
patent: 4203883 (1980-05-01), Hangauer

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