Back to results
US 7,030,264 B1Granted
Bis-β-hydroxyethyl terephthalate
AssigneeAies Co., Ltd.
InventorsShuji Inada, Kikuchi Sato
Life of this patent
Estimating the term…
Abstract
Bis-β-hydroxyethyl terephthalate having an optical density measured in a 10 wt % methanol solution at a measurement wavelength of 380 nm and a cell optical path length of 10 mm of 0.000 to 0.006. The present invention makes it clear that purified BHET having an optical density of 0.006 or less provides high-quality PET having excellent purity, whiteness and transparency.
Claims2
Bis-β-hydroxyethyl terephthalate having (i) an optical density measured in a 10 wt. % methanol solution at a measurement wavelength of 380 nm and a cell optical path length of 10 mm of 0.000 to 0.006,
- (ii) cation content of 15 ppm or less,
- (iii) anion content of 1 ppm or less, and
- (iv) purity of 98 wt. % or more.
Dependencies are inferred from the claim text.