Aqueous urea-urethane dispersions

Details Aqueous urea-urethane dispersions Aqueous urea-urethane dispersions

C - Chemistry, Metallurgy

08

G

400/7412

C08G 18/12 (2006.01) C08G 18/08 (2006.01)

Patent

CA 1131376

266-15 ?nada GG:300 AQUEOUS UREA-URETHANE DISPERSIONS Abstract of the Disclosure There are disclosed aqueous colloidal dispersions of tertiary amine salts of urea-urethane polymers of polyamine, preferably triamine-containing polyamine, and isocyanate- terminated, urethane prepolymers having carboxylic acid groups. The urea-urethanes have sufficient tertiary amine neutralized, carboxylic acid groups to provide stable aqueous dispersions having infinite dilutability with water, and the solids of the amine- neutralized dispersions are essentially of colloidal size. Carboxylic acid groups are supplied by polyol reactants employed in making the prepolymers. The colloidal, urea-urethane polymers may be stably dispersed in the aqueous medium, even in the absence of substantial amounts of cosolvents, and are useful in, for instance, coating compositions to provide water-resistant coatings.

287835

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