Process for the production of stabilized polyisocyanates of reta

Details Process for the production of stabilized polyisocyanates of reta Process for the production of stabilized polyisocyanates of reta

1985-01-24

1985-10-08

Cockeram, Herbert S.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

25218831, 528 44, 528 54, 528 73, 521137, C08G 1808, C08G 1818, C08G 1872

Patent

active

045461651

ABSTRACT:
The present invention relates to a process for the production of solid polyisocyanates of retarded reactivity stabilized by surface modification by reacting solid, finely divided polyisocyanates, and particularly dimeric tolylene diisocyanate, dimeric diphenylmethane diisocyanate and 3,3'-diisocyanato-4,4'-dimethyl-N,N'-diphenyl urea, with acyclic, mono- or bicyclic compounds having an amidine or guanidine structure and which do not contain any hydrogen atoms reactive to isocyanates at room temperature in a quantity of from 0.1 to 25 equivalent percent of "amidine" or "guanidine" per isocyanate equivalent. The reaction may be carried out directly in a liquid medium selected from the group consisting of active hydrogen compounds, plasticizers, water, and solvents to form a suspension of polyadduct-coated, stabilized polyisocyanates in the liquid medium.

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