Process for adjusting the haze of ethyleneterephthalate polymers

Details Process for adjusting the haze of ethyleneterephthalate polymers Process for adjusting the haze of ethyleneterephthalate polymers

1995-02-15

1996-10-15

Acquah, Samuel A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528280, 528283, 528287, 528301, 528302, 528308, 5283083, 5283086, C08G 6385

Patent

active

055655459

ABSTRACT:
Process for adjusting the haze value of ethylene terephthalate homopolymers and low-modified copolymers to a value in the range of 0.5 to 20 NTU while they are being produced by direct esterification and polycondensation, where an amount of antimony and germanium catalyst that is determined on the basis of the desired degree of turbidity is added before or at the start of the esterification step in the absence of other catalysts and other compounds that would affect the haze value, and after achieving a conversion of 90 to 98%, another dose of antimony catalyst corresponding to a total added amount of Sb+Ge in the range of 160 to 350 ppm is added, and then after addition of the catalyst is concluded, a phosphorus stabilizer is added to the reaction mixture in an amount to correspond to 0 to 50 ppm phosphorus.

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