Patent ID: 11866546
Assignee: ROQUETTE FRERES
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 6:
7. A process for preparing a thermoplastic polyester as claimed in claim 1, comprising:
a step of introducing, into a reactor, monomers comprising the at least one 1,4:3,6-dianhydro-L-iditol (A), the at least one linear aliphatic diol (B) and the at least one aromatic dicarboxylic acid (C);
a step of introducing a catalytic system into the reactor;
a step of polymerizing the monomers so as to form the thermoplastic polyester, the polymerizing step consisting of:
a first step of oligomerization, during which the reaction medium is stirred under an inert atmosphere at a temperature ranging from 230 to 280° C.;
a second step of condensation of the oligomers, during which the oligomers formed are stirred under vacuum, at a temperature ranging from 250 to 300° C. so as to form the thermoplastic polyester; and

a step of recovering the thermoplastic polyester.