Slow-crystallizing polyester resins

  • US 7,129,317 B2
  • Filed: 05/21/2004
  • Issued: 10/31/2006
  • Est. Priority Date: 05/21/2003
  • Status: Active Grant
First Claim
Patent Images

1. A polyethylene terephthalate resin, comprising:

  • less than about 25 ppm of elemental antimony, if any; and

    more than about 5 ppm of elemental phosphorus; and

    wherein the polyethylene terephthalate resin has a heating crystallization exotherm peak temperature (TCH) of more than about 140°

    C. at a heating rate of 10°

    C. per minute as measured by differential scanning calorimetry;

    wherein the polyethylene terephthalate resin has an absorbance (A) of at least about 0.18 cm

    1
    at a wavelength of 1100 nm or at a wavelength of 1280 nm; and

    wherein the polyethylene terephthalate resin has an L* luminosity value of more than about 70 as classified in the CIE L*a*b* color space.

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