Process to produce polyesters which incorporate isosorbide
First Claim
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1. A process to produce polyesters comprising:
- melt mixing a first polyester which incorporates isosorbide comprised essentially of;
45.0 to 50.0 mole percent of a dicarboxylic acid component;
5.0 to 50.0 mole percent of isosorbide;
0 to 45.0 mole percent of a diol component other than ethylene glycol or di(ethylene glycol); and
0 to 5.0 mole percent of a polyfunctional branching agent component;
with a second polyester comprised essentially of;
45.0 to 50.0 mole percent of a dicarboxylic acid component, 45.0-50.0 mole percent of a diol component other than isosorbide; and
0 to 5.0 mole percent of a polyfunctional branching agent component;
at a temperature of 150°
C.-350°
C. for at least one minute to effect transesterifcation, followed by a finishing step to increase the inherent viscosity to at least 0.5 dL/g.
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Abstract
The present invention provides a process to produce isosorbide-containing polyesters. The process allows for higher isosorbide incorporation than previously found while maintaining high polymeric molecular weights.
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Citations
7 Claims
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1. A process to produce polyesters comprising:
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melt mixing a first polyester which incorporates isosorbide comprised essentially of;
45.0 to 50.0 mole percent of a dicarboxylic acid component;
5.0 to 50.0 mole percent of isosorbide;
0 to 45.0 mole percent of a diol component other than ethylene glycol or di(ethylene glycol); and
0 to 5.0 mole percent of a polyfunctional branching agent component;
with a second polyester comprised essentially of;
45.0 to 50.0 mole percent of a dicarboxylic acid component, 45.0-50.0 mole percent of a diol component other than isosorbide; and
0 to 5.0 mole percent of a polyfunctional branching agent component;
at a temperature of 150°
C.-350°
C. for at least one minute to effect transesterifcation, followed by a finishing step to increase the inherent viscosity to at least 0.5 dL/g.- View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification