Process for manufacture of shaped polyethylene terephthalate str

Details Process for manufacture of shaped polyethylene terephthalate str Process for manufacture of shaped polyethylene terephthalate str

1990-03-20

1991-08-20

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528277, 528279, 528281, 528282, 5283081, 5283083, 524730, 524789, C08G 6382

Patent

active

050415255

ABSTRACT:
In a process for the manufacture of shaped polyethylene terephthalate structures, such as film or fiber, a crystalline sodium aluminosilicate molecular sieve is used as the catalyst for the polymerization of di(2-hydroxyethyl phthalate) or higher oligomer intermediate. In film, especially for audio and video tapes, the molecular sieve serves both as the catalyst and as a slip additive. In addition to the fact that this process eliminates antimony trioxide, heretofore used as the polymerization catalyst, the polyethylene terephthalate film made by the process of this invention has considerably fewer defects such as microgel inclusions, black specks, and pimples. Further, the amount of diethylene glycol formed in the process is reduced. Finally, polyethylene terephthalate degradation, contributing to the exudation of lower molecular weight materials, also is reduced.

REFERENCES:
patent: 3876608 (1975-04-01), Anderson et al.

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