Process for the production of polyisocyanate mixtures...

Details Process for the production of polyisocyanate mixtures... Process for the production of polyisocyanate mixtures...

C - Chemistry, Metallurgy

08

G

400/111, 402/159

C08G 18/79 (2006.01) C07D 229/00 (2006.01) C07D 251/34 (2006.01) C08G 18/02 (2006.01)

Patent

CA 1328137

A PROCESS FOR THE PRODUCTION OF POLYISOCYANATE MIXTURES CONTAINING URETDIONE AND ISOCYANURATE GROUPS ABSTRACT OF THE DISCLOSURE The present invention is directed to a process for the production of polyisocyanate mixtures containing isocyanurate groups and uretdione groups in a molar ratio of about 1:9 to 9:1 by oligomerizing a portion of the isocyanate groups of hexamethylene diisocyanate using trialkyl phosphines and/or peralkylated phosphorus acid triamides as the catalysts which accelerate the dimerization and trimerization of isocyanate groups, terminating the reaction at the desired degree of oligomerization by the addition of a catalyst poison and removing unreacted hexamethylene diisocyanate to a residual content of at most 0.5% by weight, characterized in that, before addition of the catalyst, the hexamethylene diisocyanate starting material is freed from carbon dioxide to a residual content of less than 20 ppm (weight). The present invention is also directed to the polyisocyanates containing uretdione groups and isocyanurate groups obtainable by this process and their use, optionally blocked by blocking agents for isocyanate groups, as the isocyanate component for the production of polyisocyanate polyaddition products.

593015

Affiliated with

Also associated with

Rating

Process for the production of polyisocyanate mixtures... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the production of polyisocyanate mixtures..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of polyisocyanate mixtures... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1334528