Patent · US Expired

Process for the synthesis of polyethylene carboxylate from polyethylene carboxylate waste

US5869543A · kind A · utility

21Cited by

4References

11Claims

0Family size

Assignee

Zimmer, Inc. · US

Inventors

Frank-Rudiger Boos · Alzenau, DE
Norman Schnittker · Niederrodenbach, DE
Joachim Seelig · Bad Orb, DE

Key dates

Filing date	Aug 29, 1997
Grant date	Feb 9, 1999
Priority date	—
Expiry date	Aug 29, 2017

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02W30/62
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention comprises a method for synthesizing polyethylene terephthalate from waste polyethylene terephthalate by cleavage with ethylene glycol and separation of bis(hydroxyethylene) terephthalate from the cleavage mixture with a specific temperature program, recrystallization from water, and esterification and polycondensation with the addition of terephthalic acid. The invention further comprises a method for synthesis of polyethylene naphthalate from waste polyethylene naphthalate in a similar manner.

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