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

Claim 0:
1. A bifuran-modified polyester wherein the bifuran-modified polyester is polyethylene-terephthalate-co-(2,2′-bifuran-5,5′-dicarboxylate) prepared by a method comprising: esterifying or transesterifying a diacid component comprising from 2 to 10 mole percent 2,2′-bifuran-5,5′-dicarboxylate and a diol component with a 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; and polycondensation to form the modified bifuran polyester; and wherein the bifuran modified polyester has:
an inherent viscosity of at least 0.5 g/dL,
a melting temperature (Tm) between 229° C. and 246° C.,
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 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.