Process for making molding grade polyethylene terephthalate

Details Process for making molding grade polyethylene terephthalate Process for making molding grade polyethylene terephthalate

1985-06-21

1986-09-02

Phynes, Lucille M.

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

Synthetic resins

From carboxylic acid or derivative thereof

528272, 5283082, 5283083, 528483, C08G 6304, C08G 6334

Patent

active

046097210

ABSTRACT:
Polyethylene terephthalate (PET) produced by direct esterification of a mixture containing ethylene glycol and terephthalic acid in a mole ratio ranging from about 1.05 to about 1.35 dl/g, with at least about 325 parts of an antimony catalyst per million parts of polymer product, can be treated to reduce its acetaldehyde content and acetaldehyde generation rate and increase molecular weight to the levels required for the production of beverage bottles. After heat treatment to produce a crystallinity of at least about 10 percent, the PET can be used in molding after substantially conventional pre-drying and drying steps in air at the molding facility. The invention thus allows beverage bottle grade PET to be produced and prepared for molding without the conventional step of solid state polymerization or stabilization, saving energy, time, production costs and capital investment.
Also disclosed is a process for molding a PET preform wherein the polymer prepared as described above is melted, formed into the desired preform shape, and solidified by cooling. This preform can then be reheated above its glass transition temperature and molded into the desired container shape.

REFERENCES:
patent: 4263425 (1981-04-01), Rothe et al.
patent: 4271287 (1981-06-01), Shah
patent: 4385089 (1983-05-01), Bonnebat et al.
patent: 4387213 (1983-06-01), Horlbeck et al.
patent: 4476170 (1984-10-01), Jabarin

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