Patent · US Expired

Method and device for the recovery of linear polyester

US6162837A · kind A · utility

35Cited by

3References

15Claims

0Family size

Assignee

Karl Fischer Industrieanlagen GmbH · DE

Inventors

Luder Gerking · Berlin, DE
Rainer Hagen · Leverkusen, DE
Dieter Otto Taurat · Berlin, DE

Key dates

Filing date	Mar 8, 1999
Grant date	Dec 19, 2000
Priority date	—
Expiry date	Mar 8, 2019

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02W30/62
WIPO fieldOther special machines
WIPO sectorMechanical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.