Process for manufacturing polytetramethylene terephthalate

Details Process for manufacturing polytetramethylene terephthalate Process for manufacturing polytetramethylene terephthalate

1984-01-31

1985-04-16

Phynes, Lucille M.

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

Synthetic resins

From carboxylic acid or derivative thereof

528176, 528286, 560 94, C08G 6304, C08G 6322

Patent

active

045117080

ABSTRACT:
Polytetramethylene terephthalate is manufactured from terephthalic acid and 1,4-butanediol in two stages, a first stage comprising an esterification reaction employing an esterification catalyst and a second stage comprising a condensation-polymerization reaction. The esterification reaction is carried out in the presence of at least one acid amide compound, preferably selected from urea, a derivative thereof, mono- or poly-carboxylic acid amides having 1 to 9 carbon atoms, polyamides, phosphoric acid amides and sulfonic acid amides, whereby the production of tetrahydrofuran as a by-product is appreciably inhibited and the time required for the esterification reaction is reduced.

REFERENCES:
patent: 3479324 (1969-11-01), Carter et al.
patent: 3591625 (1971-07-01), Twilley et al.
patent: 3641111 (1972-02-01), Lazarus
patent: 3742024 (1973-06-01), Ukai et al.
patent: 4056514 (1977-11-01), Strehler et al.
patent: 4200732 (1980-04-01), Horlbeck et al.
patent: 4439597 (1984-03-01), Hall et al.

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