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Process for preparing copolyesters comprising reacting a carbonyl halide with a dicarboxylic acid and a dihydroxy compound in the presence of a tertiary amine

  • US 3,030,331 A
  • Filed: 08/22/1957
  • Issued: 04/17/1962
  • Est. Priority Date: 08/22/1957
  • Status: Expired due to Term
First Claim
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13. A PROCESS FOR THE PREPARATION OF BLOCK COPOLYESTERS COMPRISING THE SEQUENTIAL STEPS OF (1) PASSING A CARBONYL HALIDE INTO A SOLUTION OF A DIHYDRIC PHENOL, SAID SOLUTION COMPRISING AN ORGANIC SOLVENT CONTAINING IN EXCESS OF TWO MOAR EQUIVALENTS OF A TERTIARY AMINE FOR EACH MOLAR EQUIVALENT OF CARBONYL HALIDE, (2) ADDING A DIFUNCTIONAL CARBOXYLIC ACID TO THE SOLUTION AND (3) PASSING ADDITIONAL PHOSGENE INTO THE SOLUTION, SAID STEPS BEING CARRIED OUT AT A TEMPERATURE BELOW 75*C.

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