Process for producing uretidione dimers of isocyanates using cat

Details Process for producing uretidione dimers of isocyanates using cat Process for producing uretidione dimers of isocyanates using cat

1993-04-05

1994-05-24

Shah, Mukund J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548951, 528 73, C07D22900, C08G 1874

Patent

active

053150040

ABSTRACT:
This invention relates to a process for preparing a dimer by the steps of: (a) cyclodimerizing a polyisocyanate in the presence of a dimerization catalyst which is covalently bound to an insoluble inorganic matrix by contacting said polyisocyanate with said catalyst at a temperature of between about 20 and about 135.degree. C. in a reaction to form an uretidione-containing cyclodimerized isocyanate wherein a portion of the isocyanate moieties comprising said polyisocyanate are converted to uretidione groups, and (b) separating said catalyst from said cyclodimerized isocyanate in order to stop said reaction after a desired amount of isocyanate moieties in said polyisocyanate have been converted to uretidione moieties.

REFERENCES:
patent: 3919195 (1975-11-01), Bakhitov et al.
patent: 4476054 (1984-10-01), Disteldorf et al.
patent: 4912210 (1990-03-01), Disteldorf et al.
patent: 4929724 (1990-05-01), Engbert et al.
patent: 5100998 (1992-03-01), Kopp et al.
patent: 5149766 (1992-09-01), Bruchmann

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