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US 5,328,977 AGranted
Polymerization catalyst for the preparation of poly(isocyanates)
AssigneeMiles Inc.
InventorsAaron D. Meltzer, Gary W. Munko, Harald Pielartzik
Life of this patent
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Abstract
An improvement in the process of preparing nylon-1 by the polymerization of isocyanates is disclosed. Accordingly, the improvement comprising using in the process a catalyst conforming to (X).sub.n Me(OR).sub.m where Me is titanium or zirconium, X is chlorine or bromine atom, R is an aliphatic radical having 1 to 20 carbon atoms and where the sum of m=n is 4 with the proviso that where Me is titanium n is 1 or 2, and where Me is zirconium n is 1-4.
Claims7
In the process of preparing nylon-1 by the polymerization of isocyanates, the improvement comprising using a catalyst conforming to
- (X).sub.n Me(OR).sub.m
- where Me is titanium or zirconium, X is chlorine or bromine atom, R is an aliphatic radical having 1 to 20 carbon atoms and where the sum of m+n is 4 with the proviso that where Me is titanium n is 1 or 2, and where Me is zirconium n is 1-4.
Dependencies are inferred from the claim text.