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Copolyestercarbonate composition derived from dihydricphenol, carbonate precursor and alpha omega-dicarboxylic acid

  • US 5,510,448 A
  • Filed: 01/17/1995
  • Issued: 04/23/1996
  • Est. Priority Date: 12/22/1989
  • Status: Expired due to Term
First Claim
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1. A composition comprising a copolyestercarbonate derived from a dihydric phenol, a carbonate precursor, and an aliphatic alpha omega dicarboxylic acid or ester precursor wherein the dicarboxylic acid or ester precursor has from 10 to about 20 carbon atoms, inclusive, is present in the copolyestercarbonate in quantities of from about 2 to 30 mole percent of the dihydric phenol and is converted to a salt before reaction with the dihydric phenol and the carbonate precursor and wherein the carbonate precursor is added over a period of time and, from about 0 to about 95% of the period of time, the pH of the reaction is from about 8 to 8.5 and, for the remainder of the period, the pH of the reaction is from about 10 to 12.

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