Novel polyisocyanurate catalysts
AssigneeTexaco Development Corporation
InventorsEdward E. McEntire, Robert L. Zimmerman
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Abstract
Polyisocyanurate catalysts are disclosed which have the formula: ##STR1## where R.sub.1 and R.sub.2 are independently selected from alkyl groups of less than about 3 carbon atoms or where R.sub.1 and R.sub.2 together comprise cycloalkyl or morpholino groups and where R.sub.3 is hydrogen or alkyl groups containing less than about 3 carbon atoms. Said catalysts are useful in promoting the reaction between a polyol and an aromatic polyisocyanate to prepare a polymer containing recurring isocyanurate and urethane linkages.
Claims8
In a process for preparing a polymer containing recuring isocyanurate and urethane linkages, which polymer comprises the reaction product of a polyol and an aromatic polyisocyanate, while utilizing an isocyanurate group formation catalyst;
- the improvement which comprises
- employing as said isocyanurate catalyst a compound falling within the following structural formula:
- ##STR3## where R.sub.1 and R.sub.2 are independently selected from alkyl groups of less than about 3 carbon atoms or where R.sub.1 and R.sub.2 together comprise cycloalkyl or morpholino groups and where R.sub.3 is hydrogen or alkyl groups containing less than about 3 carbon atoms.
In a process for preparing a polymer containing recurring isocyanurate and urethane linkages, which polymer comprises the reaction product of a polyol and an aromatic polyisocyanate, while utilizing an isocyanurate group formation catalyst;
- the improvement which comprises
- employing as said isocyanurate catalyst 1-(2,2-dimethylhydrazono)-2-hydroxyethane.
Dependencies are inferred from the claim text.