Process for preparing copolyesters comprising reacting a carbonyl halide with a dicarboxylic acid and a dihydroxy compound in the presence of a tertiary amine
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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13 Claims
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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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Current AssigneeEugene P. Goldberg
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Original AssigneeEugene P. Goldberg
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InventorsGoldberg, Eugene P.
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Application NumberUS03/679,747Time in Patent Office1,699 DaysField of SearchUS Class Current528/182CPC Class CodesC08G 63/64 Polyesters containing both ...
