Continuous process for the production of mdi allophanates

Details Continuous process for the production of mdi allophanates Continuous process for the production of mdi allophanates

C - Chemistry, Metallurgy

08

G

C08G 18/76 (2006.01) C07C 273/00 (2006.01) C07C 273/18 (2006.01) C07C 275/60 (2006.01) C08G 18/22 (2006.01) C08G 18/32 (2006.01) C08G 18/78 (2006.01) C08G 18/80 (2006.01)

Patent

CA 2430650

This invention relates to a continuous process for the production of allophanate modified diphenylmethane diisocyanates having an NCO group content of 19 to 32% and an urethane content of less than 2 area % by GPC analysis. The process comprises (1) continuously reacting (a) diphenylmethane diisocyanate and (b) an alcohol, in the presence of (c) at least 25 ppm of an allophante catalyst, based on the combined weight of the diphenylmethane diisocyanate and the alcohol, in a reactor in an oxygen-free environment; (2) continuously treating the product exiting the reactor with a catalyst stopper at the reaction temperature; and (3) cooling the resultant product.

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