Crystallization-stable mdi allophanates by a two-stage process

Details Crystallization-stable mdi allophanates by a two-stage process Crystallization-stable mdi allophanates by a two-stage process

C - Chemistry, Metallurgy

08

G

C08G 18/78 (2006.01) C07C 273/18 (2006.01) C07C 275/60 (2006.01) C08G 18/80 (2006.01)

Patent

CA 2523401

The present invention relates to new diphenylmethane diisocyanate (i.e. MDI) allophanates and to a process for their preparation. These new MDI allophanates are prepared by a two-stage process, which in spite of a relatively high degree of oligomerization are distinguished by crystallization stability.

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