Manufacture of finely-divided urea-urethanes

Details Manufacture of finely-divided urea-urethanes Manufacture of finely-divided urea-urethanes

C - Chemistry, Metallurgy

08

G

402/141, 400/741

C08G 18/10 (2006.01) C08G 18/08 (2006.01) C08G 18/32 (2006.01) C08G 18/42 (2006.01)

Patent

CA 1046691

METHOD Abstract of the Disclosure Finely-divided, solid urea-urethane particles are prepared by combining under agitation and in an inert liquid reaction medium, a diamine and an isocyanate-terminated ureathane prepolymer of a hydroxy-terminated polyester polyol and essentially hydrocarbon diisocyanate, to provide urea- urethane polymer, said liquid reaction medium containing aromatic hydrocarbon solvent which can swell urea-urethane polymer; and contacting said urea-urethane polymer with aliphatic or alicyclic hydrocarbon liquid to obtain finely- divided, solid urea-urethane particles. These materials are useful as coatings, especially when applied electrostatically as dry powder coatings.

210478

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