Process for poly (bisphenol A/terephthalate/carbonate) using pyr

Details Process for poly (bisphenol A/terephthalate/carbonate) using pyr Process for poly (bisphenol A/terephthalate/carbonate) using pyr

1979-01-26

1980-08-26

Lee, Lester L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

525418, 525462, 525466, 528194, 528196, 528199, 528371, C08G 6364

Patent

active

042196353

ABSTRACT:
Poly(ester/carbonates) are produced by adding phosgene to a reaction mixture of bisphenol A and terephthalic acid as ester-forming reactants, at mole ratios in the range between 2.0:0.8 and 2.0:1.3, in which the reaction medium consists essentially of pyridine, the concentration of bisphenol A plus terephthalic acid is in the range between 5 and 50 grams per 100 ml of pyridine; and the phosgene is added under agitation at a rate of at least 0.07 gm-mmole/liter.sec. The process is carried out at temperature in the range between 50.degree. C. and 115.degree. C. and not below the temperature given by the Arrhenius equation:

REFERENCES:
patent: 3220976 (1965-11-01), Goldberg

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