Liquid methylene diphenyl diisocyanate

Details Liquid methylene diphenyl diisocyanate Liquid methylene diphenyl diisocyanate

C - Chemistry, Metallurgy

07

C

C07C 275/60 (2006.01) C08G 18/10 (2006.01) C08G 18/78 (2006.01)

Patent

CA 2128263

Disclosed herein are processes for the production of allophanate-modified diphenylmethane diisocyanate prepolymers and the products produced by the processes which are both stable and liquid at 25°C by reacting (i) 4,4'-Biphenyl-methane diisocyanate containing from 2 to 60% by weight 2,4'-MDI and less than 6% by weight of the 2,2'-MDI with (ii) an aromatic alcohol containing between 6 and 18 carbon atoms such as phenol, with the resulting product being converted to the allophanate having an isocyanate group content of from 12 to 32% by weight.

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