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Process for the trimerization of diisocyanates

  • US 4,454,317 A
  • Filed: 07/23/1982
  • Issued: 06/12/1984
  • Est. Priority Date: 04/21/1979
  • Status: Expired due to Term
First Claim
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1. In a process for trimerization of diisocyanates in the presence of a catalyst comprising quaternary ammonium salts of organic acids having the formula:

  • ##STR10## wherein X represents the same or different radicals selected from the group consisting of C1 -C20 alkyl, C3 -C8 cycloalkyl, and C2 -C20 aralkyl;

    two X radicals taken together with at least one other heteroatom forming a hetero-ring and three X radicals taken together with the quarternary nitrogen atoms forming a heteroring through a common heteroatom such that said heterocyclic ring structure is selected from the group consisting of triethylene diamine, methyl triethylene diamine, quinuclidine, N-methylmorpholine, N-ethylmorpholine and N,N'"'"'-dimethylpiperazine;

    R is alkyl, cycloalkyl or aralkyl, R" is R or hydrogen;

    R+R" together form a C1 -C12 alkyl radical;

    R'"'"' is hydrogen, hydroxyl or a C1 -C12 alkyl radical optionally containing a CH.sub.(3-b) Zb group, wherein b=1 to 3 and Z is OH, the improvement comprising;

    reacting said diisocyanate with said catalyst in an amount of 0.02-0.1% by weight calculated on the weight of the compound to be trimerized at a temperature ranging from 40°

    -120°

    C.

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