Process for preparing a polyester of hydroxy naphthoic acid and

Details Process for preparing a polyester of hydroxy naphthoic acid and Process for preparing a polyester of hydroxy naphthoic acid and

1983-02-22

1984-01-31

Lee, Lester L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528166, 528180, 528181, 528190, 528206, 528271, C08G 6308, C08G 6310

Patent

active

044291051

ABSTRACT:
Provided is a method for preparing aromatic copolyesters of hydroxy naphthoic acid and hydroxy benzoic acid via an in situ esterification technique whereby there is no isolation of the esterified monomers. The process comprises reacting the aromatic hydroxy acid monomers with an agent such as acetic anhydride in order to esterify the hydroxy moieties and subsequently polymerizing the esterified hydroxy monomers without isolation thereof, all in the presence of from about 5 to 50 ppm iron. Advantageously, the process allows one to obtain a wholly aromatic polyester of high inherent viscosity and good melt stability while avoiding the time consuming step of having to isolate the esterified hydroxy monomers prior to polymerization.

REFERENCES:
patent: 4161470 (1979-07-01), Calundann
patent: 4219461 (1980-08-01), Calundann
patent: 4256624 (1981-03-01), Calundann
patent: 4337190 (1982-06-01), Calundann
patent: 4355133 (1982-10-01), East et al.
patent: 4355134 (1982-10-01), Charbonneau et al.
patent: 4359569 (1982-11-01), Siemionko
patent: 4370466 (1983-01-01), Siemionko

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