Thermal oxidatively stable polycarbonate
AssigneeGeneral Electric Company
InventorThomas J. Hoogeboom
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Abstract
A thermal oxidatively stable polycarbonate composition stabilized with a minor amount of an ester of a phosphorodihalidous acid and to a process for preparing a thermal oxidatively stable polymer. In the process, the ester of a phosphorodihalidous acid is reacted with the bisphenol-A monomer. In addition, an epoxy may be used in admixture with the composition, which epoxy compound has the following formula: ##STR1##
Claims8
A thermal oxidatively stable polymer composition which is the residue of the condensation reaction of bisphenol-A, a carbonate precursor and a minor amount of an ester of a phosphorodihalidous acid having the following formula:
- ##STR9## wherein X is a halogen atom independently selected from the group consisting of fluorine, chlorine, bromine and iodine and R is an organic radical selected from the group consisting of aryl, haloaryl, alkyl, cycloalkyl, aralkyl and alkaryl radicals of 1-115 carbon atoms, said minor amount of the ester of a phosphorodihalidous acid being sufficient to provide an elemental phosphorus content in the polymer of 0.0005 to about 1.0 weight percent based on the total weight of the polymer.
In a process for preparing a thermal oxidatively stable polymer by reacting bisphenol-A with a carbonate precursor in the presence of an acid acceptor, a catalyst and a molecular weight regulator;
- the improvement which consists of reacting 0.000015 to about 0.05 mole per mole of bisphenol-A of an ester of a phosphorodihalidous acid having the following formula:
- ##STR10## wherein X is a halogen atom independently selected from the group consisting of fluorine, chlorine, bromine and iodine and R is an organic radical selected from the group consisting of aryl, haloaryl, alkyl, aralkyl and alkaryl radicals of 1-15 carbon atoms.
Dependencies are inferred from the claim text.