Process for the preparation of aromatic polyesters

Details Process for the preparation of aromatic polyesters Process for the preparation of aromatic polyesters

1993-04-01

1994-08-23

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528176, 528180, 528272, 528279, 528283, C08G 6378

Patent

active

053409086

ABSTRACT:
This invention relates to a process for the preparation of aromatic polyester(s) having an intrinsic viscosity greater than 0.4 dL/g in chloroform at 30.degree. C. which comprises (a) reacting diarylesters of tere and isophthalic acid(s) and dihydric phenol(s) in the melt phase in an inert atmosphere in the presence of a catalyst selected from alkoxides of Group IV B metals and derivatives of Group IV A metals and in the presence of an organic solvent at a temperature in the range of 100.degree.-300.degree. C. to form a prepolymer having intrinsic viscosity in the range of 0.1 to 0.3 dL/g in chloroform at 30.degree. C. (b) purifying the prepolymer using conventional solvent extraction methods and (c) Polycondensing the purified prepolymer at a temperature in the range of 300.degree.-350.degree. C. in presence of a catalyst selected from alkoxides of Group IVB metals and derivatives of Group IVA metals under reduced pressure.

REFERENCES:
patent: 3553167 (1971-01-01), Schnell
patent: 4137278 (1979-01-01), Lemper et al.
patent: 4327206 (1982-04-01), Jackson, Jr. et al.

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