Continuous process for preparing a polyurethane latex

Details Continuous process for preparing a polyurethane latex Continuous process for preparing a polyurethane latex

C - Chemistry, Metallurgy

08

G

C08G 18/10 (2006.01) C08G 18/32 (2006.01) C08G 18/40 (2006.01) C08G 18/66 (2006.01) C08G 18/72 (2006.01) C08J 3/03 (2006.01)

Patent

CA 2362158

A polyurethane/urea/thiourea latex having a narrow molecular weight polydispersity and sub-micron particle size can be prepared by first preparing a high solids (between about 65 % and 74 % solids) latex of a polyurethane/urea/thiourea prepolymer, then contacting the emulsion with a chain-extending reagent under such conditions to form the polymer latex.

On peut préparer un latex de polyuréthane/urée/thiourée présentant une polydispersité de masse moléculaire étroite et une grosseur particulaire submicronique tout d'abord en préparant un latex à teneur élevée en solides (entre environ 65 % et 74 % de solides) d'un prépolymère de polyuréthane/urée/thiourée, et ensuite en mettant l'émulsion au contact d'un réactif prolongateur de chaîne dans ces conditions pour former le latex polymère.

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