Method and device for the recovery of linear polyester

Details Method and device for the recovery of linear polyester Method and device for the recovery of linear polyester

1999-03-08

2000-12-19

Cain, Edward J.

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

Synthetic resins

Process of treating scrap or waste product containing solid...

521485, C08J 1110

Patent

active

061628379

ABSTRACT:
A method and device for recovering linear polyesters, such as PET and PBT, from polyester waste of the most varied form, in a continuous manner, in which undried or not dried-through waste is melted, the polymer chains being hydrolytically degraded by adhering moisture, and in which diol, corresponding to the basic constitutional unit of the polymer, is added to the melt resulting in glycolytic degradation, and the melt so treated is further condensed to the desired degree of polymerization.

REFERENCES:
patent: 4578502 (1986-03-01), Cudmore
patent: 5451611 (1995-09-01), Chilukuri et al.
patent: 5756554 (1998-05-01), Fisher

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