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US 4,067,830 AGranted
Catalytic trimerization of polyisocyanates
AssigneeAshland Oil, Inc.
InventorJiri E. Kresta
Life of this patent
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Abstract
Compounds (aminimides) of the class wherein a negatively charged nitrogen atom of an acylamide is directly bonded to a cationic nitrogen atom having one hydroxyethyl and two methyl substituents represent uniquely effective catalysts for the trimerization of the isocyanate radical. These aminimides are especially useful as catalysts for the preparation of rigid polyisocyanate-polyisocyanurate foams.
Claims9
In a process for preparing rigid polyisocyanurate-polyurethane foam by the catalyzed reaction of a polyol with an excess of polyisocyanate;
- the improvement of effecting said reaction in the presence of a catalytic amount of an aminimide having the formula:
- ##STR3## wherein n is the integer 1 or 2;
- R is C.sub.2 -C.sub.8 alkylene when n is 2;
- and R is C.sub.1 -C.sub.18 alkyl, methoxymethylene or phenyl when n is 1.
1 more element
Dependencies are inferred from the claim text.