Copolyesters

Details Copolyesters Copolyesters

1989-01-30

1991-08-13

Short, Patricia

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524451, 525437, 528195, C08L 6702

Patent

active

050397176

ABSTRACT:
Injection-moldable copolyesters of terephthalate units, ethylene units and a high proportion (e.g. 82-87) mole %) of oxybenzoate units, and cookware made of such copolyesters. Process for making such copolyesters by reacting polyethylene terephthalate with p-acetoxybenzoic acid in a solvent, first at a temperature below 240.degree. C. to product a fragmented polyester, raising the temperature to split off acetic acid, then adding more acetoxybenzoic acid to raise the oxybenzoate content to more than 80 mole %.

REFERENCES:
patent: 3288755 (1966-11-01), Griehl
patent: 3778410 (1973-12-01), Kuhfuss
patent: 3804805 (1974-04-01), Kuhfuss
patent: 4035356 (1977-07-01), Jackson
patent: 4124561 (1978-11-01), Phipps
patent: 4585823 (1986-04-01), Saito
patent: 4626557 (1986-12-01), Duska

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