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US 5,321,050 AGranted
Method for producing modified polyisocyanurate foams
AssigneeNisshinbo Industries, Inc.
InventorsKiyotake Morimoto, Satoshi Nakamura
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Abstract
A method for producing a modified polyisocyanurate foam by reacting an organic polyisocyanate, polyol and water in the presence of a trimerizing catalyst composed of a certain hydroxyalkyl quaternary ammonium compound, and a carbodiimidizing catalyst composed of a certain phosphorene oxide. The method enables production of low density modified polyisocyanurate foams with ease and rapidly without using volatile blowing agents such as CFC, HCFC, HFC and methylene chloride.
Claims16
A method for producing a modified polyisocyanurate foam, comprising the step of:
- reacting an organic polyisocyanate, polyol and water is practiced in the presence of (a) a trimerizing catalyst selected from hydroxyalkyl quaternary ammonium compounds represented by formula (I) ##STR15## wherein R.sub.1, R.sub.2 and R.sub.3 each represent independently alkyl, aralkyl, cycloalkyl, allyl or hydroxyalkyl group;
- R.sub.4 and R.sub.5 each represent independently a hydrogen atom, alkyl, phenyl, alkenyl, hydroxyalkyl or ketoalkyl group, and (b) a carbodiimidizing catalyst selected from phosphorene oxides represented by formula (II) or (III) ##STR16## wherein R.sub.1 represents substituted or unsubstituted alkyl, phenyl, naphthyl or benzyl group;
- R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 and R.sub.7 each represent independently H, Cl or a C.sub.1 -C.sub.4 alkyl group.
Dependencies are inferred from the claim text.