Method for the preparation of polyester for a film

Details Method for the preparation of polyester for a film Method for the preparation of polyester for a film

1993-08-17

1995-01-17

Acquah, Samuel A.

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

Synthetic resins

From carboxylic acid or derivative thereof

528272, 528275, 524730, 210660, C08G 6378

Patent

active

053826515

ABSTRACT:
A method for the production of polyester suitable to be molded into a film with excellent surface properties.
The method comprises passing dispersion-in-water type silica sol with pH 8 to 11 including sodium oxide as a stabilizer and silica particles with average diameters 0.01 to 0.3 .mu.m through a column of cation exchange resin having the following formula 1 and the strong basic anion exchange having the following formula 2, in sequence to adjust the pH value to 2 to 4, adding an hydrogen bonding agent and ethylene glycol thereto, heating the resultant silica sol under a reduced pressure to remove water, so as to obtain dispersion-in-ethylene glycol type silica sol, and adding 0.01 to 5% by weight of the dispersion-in-ethylene glycol type silica sol, as based on the weight of polyester to be produced, at any step during the ester interchange reaction. ##STR1##

REFERENCES:
patent: Re32741 (1988-08-01), Miyoshi et al.
patent: 4254182 (1981-03-01), Yamaguchi et al.
patent: 4526738 (1985-07-01), Miyoshi et al.
patent: 4866012 (1989-09-01), Silverman

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