Process for the preparation of polyester, a polyester and its us

Details Process for the preparation of polyester, a polyester and its us Process for the preparation of polyester, a polyester and its us

1993-12-15

1995-05-23

Acquah, Samuel A.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

528272, 528277, 528283, 528287, 5283083, 5283086, 524706, 524779, 524401, 524414, 524440, 428 347, 428 357, 428221, 428364, 2641761, 26417714, 2642091, B29C 4700, C08G 6382

Patent

active

054179084

ABSTRACT:
Process for making a polyester having polyethylene terephthalate units including transesterifying a terephthalic acid ester with a glycol using a manganese salt as catalyst and then subjecting the product to a polycondensation reaction using a germanium-containing catalyst to form a polyester; adding phosphorous compounds to block 80 to 99% by weight of the active manganese salt thus leaving an unblocked portion of the manganese salt prior to the polycondensation; and adding 10 to 100 ppm of Ge at the end of a ethylene glycol stage of the polymerization so that the Ge and the unblocked portion of the manganese salts provide the germanium-containing catalyst for the polycondensation reaction. The P/Mn molar ratio being less than 1. The reaction mixture contains 10 to 100 ppm of manganese during the reaction.

REFERENCES:
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patent: 4182842 (1980-01-01), Winston et al.
patent: 4424140 (1984-01-01), Weinberg et al.
Vestig Akad. Navuk BSSR, Ser. Khim. Mavuk, vol. 1, pp. 105-108.
Research Disclosure, No. 128, pp. 25-26.
J. Appl. Polym. Sci., vol. 8, No. 25, pp. 1685-1694.
Chemical Abstracts, vol. 78, No. 6, 12 Feb. 1973 & JP A 7219, 178.
Chemical Abstracts, vol. 81, No. 20, 18 Nov. 1974, & JP A 73 43 190.
Chemical Abstracts, vol. 78, No. 6, 12 Feb. 1973, & JP A 72 19 179 R. Gutmann, Text. Prax. Int., 44(1), 29/30, 33, 1989.

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