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US 5,317,034 AGranted
Method for producing modified polyisocyanurate foams
AssigneeNisshinbo Industries, Inc.
InventorsSatoshi Nakamura, Hirokatsu Shirahata
Life of this patent
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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 trimerization catalyst composed of a salt of 1,8-diaza-bicyclo[5.4.0]undecene-7, and a carbodiimidation 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, HCF, HFC pentane and methylene chloride.
Claims13
A method for producing modified polyisocyanurate foam, comprising the step of:
- reacting an organic polyisocyanate, polyol and water is practiced in the presence of (a) a trimerization catalyst selected from salts of 1,8-diaza-bicyclo[5.4.0]-undecene-7 represented by formula (I) ##STR15## and (b) a carbodiimidation 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.