Process for obtaining dimethyl terephthalate from polyester scrap
US4163860A · kind A · utility
37Cited by
2References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1976 |
| Grant date | Aug 7, 1979 |
| Priority date | — |
| Expiry date | Dec 8, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2367/02
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process is disclosed for converting a bis-(diol) terephthalate to dimethyl terephthalate, by interchange in a methanol medium in the presence of magnesium methylate as catalyst. In this way dimethyl terephthalate may be regenerated from scrap of polyterephthalate or copolyterephthalate filaments or films, for the purpose of manufacturing fresh polyterephthalates or copolyterephthalates which can then be used for the manufacture of, for example, filaments or films.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.