Process for continuously producing polyester and spun fiber

Details Process for continuously producing polyester and spun fiber Process for continuously producing polyester and spun fiber

1979-09-17

1980-12-02

Phynes, Lucille M.

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

Synthetic resins

From carboxylic acid or derivative thereof

422134, 422135, 422188, 422224, 528309, C08G 6322

Patent

active

042372615

ABSTRACT:
In a process for continuously producing polyester which comprises continuously polymerizing bis-.beta.-hydroxyethyl terephthalate and/or a lower polymer thereof using a plurality of vacuum polymerization reactors equipped with a stirrer disposed in series, the improvement which comprises automatically and continuously measuring stirring power or stirring axis reaction force of at least the final polymerization reactor among the polymerization reactors from which a polymer having a limiting viscosity (.eta.) of 0.25 or more is removed, and controlling the vacuum in the polymerization reactors based on changes in the stirring power or reaction force so that the stirring power or reaction force is kept at a prescribed level, by which the degree of polymerization of the polymer removed from the polymerization reactors is controlled. A process for producing a polyester spun fiber is also disclosed.

REFERENCES:
patent: 3359074 (1967-12-01), Dobo
patent: 3644294 (1972-02-01), Siclari et al.
patent: 3841836 (1974-10-01), Lunsford et al.
patent: 4106098 (1978-08-01), Moody et al.
patent: 4138544 (1979-02-01), Janssen et al.

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