Liquification of diphenylmethane diisocyanate by partially...

Details Liquification of diphenylmethane diisocyanate by partially... Liquification of diphenylmethane diisocyanate by partially...

C - Chemistry, Metallurgy

08

G

C08G 18/80 (2006.01) C07C 263/18 (2006.01)

Patent

CA 2125613

LIQUIFICATION OF DIPHENYLMETHANE DIISOCYANATE BY PARTIALLY REACTING THE ISOCYANATE GROUPS WITH BLOCKING AGENTS ABSTRACT OF THE DISCLOSURE The present invention relates to a liquid, storage-stable isocyanate having a viscosity of less than 100,000 mPa.s at 25°C and an isocyanate content of from about 10 to 29% by weight, and is prepared by reacting a solid or semi-solid diphenylmethane diisocyanate with a blocking agent. More generally, the liquid isocyanate is prepared by reacting the solid or semi-solid diphenylmethane diisocyanate with the blocking agent in quantities such that from 7 to 55% of the isocyanate groups are blocked. Preferred blocking agents are the ketoximes, and mixtures thereof.

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