Process for preparing polycarbonates by self-condensation of bisphenol dichloroformate
First Claim
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1. THE PROCESS FOR PREPARING A POLYCARBONATE RESIN WHICH COMPRISES SELF-CONDENSING AT ELEVATED TEMPERATURES OF BETWEEN ABOUT 60*C. TO 250*C. AN ANHYDROUS MIXTURE OF A BISPHENOL DICHLOROFORMATE IN THE PRESENCE OF ABOUT A STOICHIOMETRIC QUANTITY OF A METAL SALT AS THE SOLE REACTIVE MATERIALS IN THE REACTION, SAID METAL SALT BEING ONE IN WHICH THE CATION IS A METALION IN ITS HIGHEST VALENCE STATE SELECTED FROM GROUPS I-A, II-A, AND II-B OF THE DEMING PERIODIC SYSTEM OF ELEMENTS AND THE ANION IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF CO3--, HCO3-, SO3--, AND HSO3-.
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1 Claim
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1. THE PROCESS FOR PREPARING A POLYCARBONATE RESIN WHICH COMPRISES SELF-CONDENSING AT ELEVATED TEMPERATURES OF BETWEEN ABOUT 60*C. TO 250*C. AN ANHYDROUS MIXTURE OF A BISPHENOL DICHLOROFORMATE IN THE PRESENCE OF ABOUT A STOICHIOMETRIC QUANTITY OF A METAL SALT AS THE SOLE REACTIVE MATERIALS IN THE REACTION, SAID METAL SALT BEING ONE IN WHICH THE CATION IS A METALION IN ITS HIGHEST VALENCE STATE SELECTED FROM GROUPS I-A, II-A, AND II-B OF THE DEMING PERIODIC SYSTEM OF ELEMENTS AND THE ANION IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF CO3--, HCO3-, SO3--, AND HSO3-.
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Current AssigneeCotter, Robert J., Markus Matzner, Raymond P. Kurkjy
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Original AssigneeCotter, Robert J., Markus Matzner, Raymond P. Kurkjy
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InventorsKurkjy, Raymond P., MARKUS MATZNER, Cotter, Robert J.
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Application NumberUS04/208,671Time in Patent Office1,736 DaysField of SearchUS Class Current528/371CPC Class CodesC08G 64/06 not containing aliphatic un...C08G 64/26 using halocarbonates
