Process for manufacturing polyester
US6590060B1 · kind B1 · utility
0Cited by
7References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 30, 2001 |
| Grant date | Jul 8, 2003 |
| Priority date | — |
| Expiry date | Aug 30, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/183
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention refers to a process for manufacturing polyester comprising at least the following steps: (a) esterifying or transesterifying a carboxylic diacid or a dieester of a carboxylic diacid with a diol, (b) polymerizing in melt phase the esterification or transesterification product, (c) solidifying and granulating, (d) placing in contact the granules with a liquid swelling medium, and (e) post-condensing the granules in solid phase. The realization of the immersion step in a swelling medium permits increasing the kinetics of the solid phase post-condensation step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.