Process including depolymerization in polyester reactor for recycling polyester materials
US5559159A · kind A · utility
62Cited by
8References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1995 |
| Grant date | Sep 24, 1996 |
| Priority date | — |
| Expiry date | Dec 7, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/62
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Previously used poly(ethylene terephthalate) polyester materials and copolymers thereof, and in particular postconsumer polyester materials, are depolymerized and repolymerized to produce bottle grade polymer containing up to 75% of the previously used material. The process involves the solubilization and depolymerization of the previously used polyester material in a transesterification and/or polymerization mixture containing dimethylterephthalate, ethylene glycol and transesterification products thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.