Process for obtaining modified polyethylene terephthalate pillin

Details Process for obtaining modified polyethylene terephthalate pillin Process for obtaining modified polyethylene terephthalate pillin

1994-02-04

1995-12-26

Seidleck, James J.

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

Synthetic resins

From carboxylic acid or derivative thereof

5283088, C08G 63695

Patent

active

054789095

ABSTRACT:
The present invention relates to a process for obtaining continuously polyethylene terephthalate modified by --SiO-- groups in a proportion of 30014 700 ppm of Si during the direct esterification reaction between terephthalic acid and ethylene glycol, followed by polycondensation in a known manner by introducing methoxyethyl silicate or propyl silicate at a time when the prepolymer has a weight-average molecular mass of between 9,000 and 16,000, a polydispersity index of between 1.5 and 2, and when it is at a temperature of between 260.degree. and 290.degree. C., and at a pressure of between 1.5 and 2.5 bars, the silicate/prepolymer reaction time being at least 5 minutes.
The present invention also relates to pilling-free fibers originating from the modified polyethylene terephthalate and to a process for obtaining them.

REFERENCES:
patent: 3335211 (1967-08-01), Mead et al.
patent: 3475371 (1969-10-01), Stewart et al.
patent: 3917648 (1975-11-01), McLeod
Goodman, Encyclopedia of Polymer Science and Engineering, vol. 12, "Polyesters", pp. 1-74, 1988 (month unavailable).

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