Process for the production of soluble high molecular weight...

Details Process for the production of soluble high molecular weight... Process for the production of soluble high molecular weight...

C - Chemistry, Metallurgy

08

G

402/131

C08G 18/08 (2006.01)

Patent

CA 1052043

AN IMPROVED PROCESS FOR THE PRODUCTION OF SOLUBLE HIGH MOLECULAR WEIGHT POLYURETHANES WHICH ARE FREE FROM ISOCYANATE GROUPS Abstract of the Invention This invention relates to an improved process for the production of high molecular weight polyurethanes which are free from isocyanate groups and are soluble in organic solvent in reduced reaction times. The reactants, polyol and isocyanate, for example, are mixed together with solvent and the temperature is permitted to rise under the effect of the heat of reaction. The reaction mixture is then cooled with solvent addition in such a way that the viscosity of the reaction mixture remains constant until the optimum temperature for the polyurethane formation reaction ("specific reaction temperature") is reached. The mixture is then gradually cooled until there is no residual isocyanate present and the polymer is recovered from the reaction mixture.

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