Urea and biuret liquid prepolymers of mdi

Details Urea and biuret liquid prepolymers of mdi Urea and biuret liquid prepolymers of mdi

C - Chemistry, Metallurgy

07

C

C07C 275/40 (2006.01) C07C 275/62 (2006.01) C07D 211/34 (2006.01) C07D 295/15 (2006.01) C08G 18/10 (2006.01) C08G 18/67 (2006.01) C08G 18/78 (2006.01) C08G 18/79 (2006.01) C08G 18/81 (2006.01)

Patent

CA 2145597

Storage stable, liquid prepolymers of diphenylmethane diisocyanate containing urea and/or biuret groups are prepared by reacting an aminocrotonate with a mixture of isocyanates having a specified diphenylmethane diisocyanate isomer content. These prepolymers have isocyanate group contents of from about 5 to about 30%.

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