Late addition of supplemental ethylene glycol in the preparation of copolyesters
US6103859A · kind A · utility
35Cited by
7References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1998 |
| Grant date | Aug 15, 2000 |
| Priority date | — |
| Expiry date | Mar 18, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/78
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention is directed to a method for making copolyesters of terephthalic acid and a diol component including ethylene glycol and includes the steps of adding terephthalic acid and diol to a first esterification reactor and then late addition of supplemental ethylene glycol subsequent to the first esterification reactor but prior to a point where the ethylene glycol partial pressure is reduced below about 300 torr.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.