Process for the manufacture of high molecular weight poly-(ethyl

Details Process for the manufacture of high molecular weight poly-(ethyl Process for the manufacture of high molecular weight poly-(ethyl

1979-03-12

1980-06-17

Phynes, Lucille M.

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

Synthetic resins

From carboxylic acid or derivative thereof

528283, 528286, 528309, C08G 6314

Patent

active

042085276

ABSTRACT:
In a process for preparing high molecular weight poly-(ethylene terephthalate) in two stages, comprising, in the first stage, reacting a dialkyl ester of terephthalic acid with ethylene glycol in the presence of 35 to 290 ppm of manganese, in the form of a manganese-II salt effective as a catalyst, together with 6 to 95 ppm of cobalt, in the form of a cobalt-II salt effective as a catalyst, at a temperature of 170.degree. to 220.degree. C. to give a low molecular weight precondensate; then adding 45 to 140 ppm of phosphorus in the form of a phosphorus compound effective to minimize discoloration of the product poly-(ethylene terephthalate) due to said transesterification catalysts; and, in the second stage, effecting complete condensation of the precondensate thus obtained, in the presence of catalysts at a temperature of 270.degree.-290.degree. C. and under low pressure, to give high molecular weight poly-(ethylene terephthalate),

REFERENCES:
patent: 3962189 (1976-08-01), Russin et al.
patent: 4010145 (1977-03-01), Russin et al.
patent: 4119614 (1978-10-01), King et al.
patent: 4128533 (1978-12-01), Kohler et al.
patent: 4128534 (1978-12-01), Kohler et al.
patent: 4133800 (1979-01-01), Taubinger et al.

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