Copolyester of polyethylene terephthalate and bis (4-beta hydrox

Details Copolyester of polyethylene terephthalate and bis (4-beta hydrox Copolyester of polyethylene terephthalate and bis (4-beta hydrox

1983-12-05

1985-10-15

Lee, Lester L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

428480, C08G 6366, C08G 6368

Patent

active

045475636

ABSTRACT:
A copolyester of polyethylene terephthalate and bis (4-beta hydroxy ethoxy phenyl) sulfone and a process for its preparation are provided. The copolyester has an intrinsic viscosity, glass transition temperature, and impact strength comparable to polyethylene terephthalate homopolymer but exhibits an increased crystallization time and is capable of being molded into clear articles. The process for preparing the copolyester comprises the steps of forming a polyethylene terephthalate prepolymer and polycondensing the prepolymer, preferably in the solid phase, with from about 2 to about 5 mole percent of bis (4-beta hydroxy ethoxy phenyl) sulfone in the presence of a suitable metallic catalyst system.

REFERENCES:
patent: 2973339 (1961-02-01), Muenster et al.
patent: 4145517 (1979-03-01), Go
patent: 4163100 (1979-07-01), Bier et al.
patent: 4188357 (1980-02-01), Go
patent: 4307060 (1981-12-01), Go
patent: 4330661 (1982-05-01), Go
patent: 4384106 (1983-05-01), Go et al.

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