Patent ID: 11970573
Assignee: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 6:
7. A method of making the bifuran-modified polyester of claim 1, comprising:
esterifying or transesterifying monomers comprising the diacid component and the diol component in the presence of the catalyst compound comprising metal present in an amount of from about 10 to about 450 ppm, based on the weight of the modified bifuran polyester;
wherein the diacid component comprises terephthalate and from 2 to 10 mole percent of the 2,2′-bifuran-5,5′-dicarboxylate comonomer; and
polycondensing the esterified or transesterified monomers to form the bifuran-modified polyester having:
an inherent viscosity of at least 0.5 d/dL,
a glass transition temperature (Tg) of 82° C. or more, 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 ran e 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.