BIS-.BETA.-HYDROXYETHYL TEREPHTHALATE

摘要

Bis-.beta.-hydroxyethyl terephthalate which has such a purity to provide an optical density of 0.000 to 0.006 at a wave length of 380 nm as measured und er conditions wherein a cell optical path length is 10 mm and use is made of a methanol solution thereof having a concentration of 10 wt %. It has been fou nd that a purified BHET having an optical density of 0.006 or less at a wave length of 380 nm can yield a high quality PET being excellent in purity, whiteness, transparency and the like.