Process for producing modified polyisocyanurate foams
AssigneeNisshinbo Industries, Inc.
InventorsSatoshi Nakamura, Hirokatsu Shirahata
Life of this patent
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Abstract
A modified polyisocyanurate foam is produced by reacting an organic polyisocyanate, a polyol and water in the presence of three catalyst, i.e. two particular trimerization catalysts and a carbodiimidation catalyst. There can be produced, without using any evaporating type blowing agent, a modified polyisocyanurate foam which is suitably used for continuous production of laminate boards, siding boards, insulation boards, etc.
Claims21
A process for producing a modified polyisocyanurate foam, which process comprises reacting an organic polyisocyanate, a polyol and water in the presence of:
- (a) a trimerization catalyst which is an alkali metal salt of a C.sub.1-8 aliphatic monocarboxylic acid represented by formula (II)
- R.sub.6 --COOM (II)
- wherein R.sub.6 is a hydrogen atom or a substituted or unsubstituted C.sub.1-7 aliphatic hydrocarbon group, and M is an alkali metal,
- (b) a trimerization catalyst selected from compounds of formulas (IV), (V) or (VI) ##STR21## and (c) a carbodiimidation catalyst selected from the group of compounds consisting of phosphorene oxides represented by formulas (VII) and (VIII) ##STR22## wherein R.sub.7 is a substituted or unsubstituted alkyl, phenyl, naphthyl or benzyl group, and R.sub.8, R.sub.9, R.sub.10, R.sub.11, R.sub.12 and R.sub.13 are each a hydrogen atom, a chlorine atom or a C.sub.1-4 alkyl group.
A catalyst for use in polymerization of isocyanate, which comprises:
- (a) a trimerization catalyst which is an alkali metal salt of a C.sub.1-8 aliphatic monocarboxylic acid represented by formula (II)
- R.sub.6 --COOM (II)
- wherein R.sub.6 is a hydrogen atom or a substituted or unsubstituted C.sub.1-7 aliphatic hydrocarbon group, and M is an alkali metal,
- (b) a trimerization catalyst selected from compounds of formulas (IV), (V) or (VI) ##STR23## and (c) a carbodiimidation catalyst selected from the group of compounds consisting of phosphorene oxides represented by formulas (VII) and (VIII) ##STR24## wherein R.sub.7 is a substituted or unsubstituted alkyl, phenyl, naphthyl or benzyl group, and R.sub.8, R.sub.9, R.sub.10, R.sub.11, R.sub.12 and R.sub.13 are each a hydrogen atom, a chlorine atom or a C.sub.1-4 alkyl group.
Dependencies are inferred from the claim text.