Production of polyesters

Details Production of polyesters Production of polyesters

1980-12-01

1982-05-11

Phynes, Lucille M.

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

Synthetic resins

From carboxylic acid or derivative thereof

528274, 528279, 528283, 528309, C08G 6318

Patent

active

043294448

ABSTRACT:
Poly(butylene terephthalates) are prepared by an improved process which makes it possible to directly esterify terephthalic acid and 1,4-butanediol without excessive loss of the diol reactant to side reactions. In the process, the conditions are controlled to promote rapid removal of the water as formed. It is also advantageous to minimize the contact time between 1,4-butanediol and terephthalic acid. Illustratively, 1,4-butanediol will be heated to 175.degree.-275.degree. C., terephthalic acid is gradually added, and byproduct water is removed as formed. In another embodiment, a mixture of terephthalic acid and an excess of 1,4-butanediol is heated and byproduct water is removed by entrainment in the excess 1,4-butanediol distilled from the reaction zone.

REFERENCES:
patent: 2410073 (1946-10-01), Howard
patent: 2993029 (1961-07-01), Georgian et al.
patent: 3024220 (1962-03-01), Cramer
patent: 3050533 (1962-08-01), Munro et al.
patent: 3057909 (1962-10-01), Sebelist et al.
patent: 3496146 (1970-01-01), Mellichamp, Jr.
patent: 3551386 (1970-01-01), Berkau et al.
patent: 3644483 (1972-02-01), Griehl et al.
Bjorksten, "Polyesters" (Reinhold, N.Y.) 1956, pp. 40-41.
Chemical Week, Mar. 13, 1974, pp. 34 and 35.

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