Liquid methylene diphenyl diisocyanate

Details Liquid methylene diphenyl diisocyanate Liquid methylene diphenyl diisocyanate

C - Chemistry, Metallurgy

07

C

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

Patent

CA 2128344

The present invention relates to a process for the production of a allophanate-modified MDI which is a storage stable liquid at 25°C comprising (A) reacting (i) one equivalent of a diisocyanate and (ii) one equivalent of an aliphatic alcohol containing from 1 to about 36 carbon atoms or aromatic alcohol containing from 6 to 18 carbon atoms to form a diurethane of the diisocyanate, (B) reacting the product of (A) with 4,4'-diphenylmethane diisocyanate containing from 2 to 60% by weight 2,4'-MDI and less than 6% by weight of the 2,2'-MDI, in an amount sufficient to provide an allophanate having an isocyanate group content of about 12.0 to 30.0%.

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