Bis-.beta.-hydroxyethyl terephthalate

Details Bis-.beta.-hydroxyethyl terephthalate Bis-.beta.-hydroxyethyl terephthalate

C - Chemistry, Metallurgy

07

C

C07C 69/82 (2006.01) C07C 67/52 (2006.01) C07C 67/54 (2006.01) C07C 67/56 (2006.01)

Patent

CA 2419625

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 under 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 found 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.

L'invention concerne un bis-.beta.-hydroxyéthyle téréphthalate dont la pureté permet d'obtenir une densité optique de 0,000 à 0,006 pour une longueur d'onde de 380 nm, sachant que la longueur du parcours optique d'une cellule est de 10 mm et que l'on utilise une solution de méthanol d'une concentration de 10 % en poids. On a trouvé qu'un BHET purifié ayant une densité optique de 0,006 maximum pour une longueur d'onde de 380 nm peut donner un PET de grande qualité ayant une excellente pureté, blancheur, transparence et équivalent.

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