Process for the preparation of polyisocyanates with biuret...

Details Process for the preparation of polyisocyanates with biuret... Process for the preparation of polyisocyanates with biuret...

C - Chemistry, Metallurgy

07

C

260/455.3

C07C 273/18 (2006.01) C08G 18/78 (2006.01) C07C 275/62 (2006.01)

Patent

CA 1248544

PROCESS FOR THE PREPARATION OF POLYISOCYANATES WITH BIURET STRUCTURE ABSTRACT OF THE DISCLOSURE The present invention relates to a process for the preparation of polyisocyanates which have a biuret structure by reacting excess quantities of aliphatic diisocyanates with biuretizing agents at elevated temperature, characterized in that the biuretizing agent contains a) .alpha.,.alpha.,.alpha.-trisubstituted acetic acids which do not contain isocyanate-reactive groups apart from the carboxyl group, and optionally b) water, wherein the molar ratio of biuretizing components a) to b) is within the range of from 1:0 to 1:2.5.

472918

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