Preparation of polycarbonates with bioxyanion catalyst
AssigneeCouncil of Scientific and Industrial Research
InventorsSwaminathan Sivaram, Jagdish C. Sehra, Venkat S. Iyer, Ishwar S. Bhardwaj, Sheo Satish
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Abstract
The invention discloses an improved process for the preparation of aryl polycarbonates. The process involves reacting aryl carbonate and dihydric phenol in the melt phase with a catalyst belonging to the class of quaternary ammonium bioxyanions having the general formula: ##STR1## Wherein `X` represents a carboxylate or a phenolate group or a mixture thereof and `R` represents alkyl or aryl.
Claims11
An improved process for the preparation of aryl polycarbonates which comprises reacting an arylcarbonate and a dihydric phenol in the melt phase with a catalyst belonging to the class of quaternary ammonium bioxyanions having the general formula:
- ##STR2## wherein X represents a carboxylate and R represents alkyl or aryl.
An improved process for the preparation of aryl polycarbonates which comprises reacting an aryl carbonate and a dihydric phenol in the melt phase with a catalyst selected form the group consisting of tetrabutyl ammonium benzoate, tetrabutyl ammonium bi-3-chlorobenzoate, tetrabutyl ammonium bi-4-nitrobenozate and tetrabutyl ammonium bi-4-nitro-phenolate.
Dependencies are inferred from the claim text.