Patent ID: 11912819
Assignee: EXXONMOBIL CHEMICAL PATENTS INC.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 9:
10. A method of making the bifuran polyester according to claim 1, comprising:
esterifying or transesterifying a diacid component and the diol component in the presence of a catalyst comprising a metal present in an amount of from about 10 to about 550 ppm,
based on the weight of the bifuran polyester; and
polycondensation to form the bifuran polyester having an intrinsic viscosity of at least 0.4 g/dL and a semicrystalline melting peak (Tm) with ΔHf equal to or greater than 5 J/g on the second heating ramp in a heat/cool/reheat differential scanning calorimetry (DSC) scan over a temperature range from 30° C. to 300° C. with heating and cooling rates of 10° C./min and holding the sample at temperature for 3 min before and after the cooling ramp.