Patent ID: 8304510

Claim:
A polyethylene terephthalate resin, comprising: polyethylene terephthalate polymers including between about 2 and 6 mole percent comonomer substitution; between about 2 and 50 ppm of elemental titanium; less than about 100 ppm of elemental antimony, if any; more than about 20 ppm of elemental phosphorus; a branching agent; and a heat-up rate additive that is present in the resin in an amount sufficient to improve the resin's reheating profile; and a nucleating agent, if any, in an amount that is insufficient to significantly decrease heating crystallization exotherm peak temperature (T CH ); wherein the polyethylene terephthalate resin has an L* value of more than about 65 as classified in the CIE L*a*b* color space, and an absorbance of at least about 0.18 cm −1 at a wavelength of 1100 nm or at a wavelength of 1280 nm.