Urea and biuret prepolymers of mdi

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

C - Chemistry, Metallurgy

07

C

C07C 275/00 (2006.01) C08G 18/10 (2006.01) C08G 18/50 (2006.01) C08G 18/76 (2006.01) C08G 18/80 (2006.01)

Patent

CA 2103731

UREA AND BIURET PREPOLYMERS OF MDI ABSTRACT OF THE DISCLOSURE Disclosed herein is a liquid isocyanate prepolymer having an isocyanate group content of from 10 to 30% by weight, prepared by reacting: i) a polyfunctional secondary amine group containing material of the general formula: Image wherein R represents alkyl, alkenyl, cycloalkyl, aralkyl or aryl radical: A represents an organic radical having a molecular weight between 28 and 6000 and having a functionality of m and m represents an integer from 2 to 6; with ii) an isocyanate mixture comprising: a) from 50 to 100% by weight of diphenylmethane diisocyanate of which from 2 to 50% by weight consist of 2,2'- and 2,4'-isomers; and b) the balance being polyphenylpolymethylene polyisocyanates.

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