Process for the manufacture of linear high molecular weight poly

Details Process for the manufacture of linear high molecular weight poly Process for the manufacture of linear high molecular weight poly

1978-08-10

1980-07-22

Phynes, Lucille M.

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

Synthetic resins

From carboxylic acid or derivative thereof

528309, 528503, 422131, 422200, C08G 6318

Patent

active

042140722

ABSTRACT:
A process for the manufacture of high molecular weight linear polyesters which are derived from dicarboxylic acids or their ester-forming derivatives and from diols, by condensing polyester precondensates, having a relative viscosity of at least 1.05, at from 270.degree. to 340.degree. C. under reduced pressure, the condensation being started at from 290.degree. to 340.degree. C. and the temperature being lowered as the condensation progresses, the final temperature being at least 10.degree. C. above the melting point of the particular polyester produced, and an apparatus for carrying out the process.

REFERENCES:
patent: 3402023 (1968-09-01), Dobo
patent: 3499873 (1970-03-01), Kuehne et al.
patent: 3644294 (1972-02-01), Siclari et al.
patent: 4138544 (1979-02-01), Janssen et al.

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