✦ LIBER ✦
5560350 High efficiency, forced hot air heater which humidifies and cleans the air : Kim Dae Si Newton, MA, United States
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 115 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0959-6526
No coin nor oath required. For personal study only.
✦ Synopsis
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.