Process for making pre-gels for a cross-linked branched polyester
US6444782B1 · kind B1 · utility
40Cited by
22References
32Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 26, 2000 |
| Grant date | Sep 3, 2002 |
| Priority date | — |
| Expiry date | Apr 26, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/0002
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to a process for making a high molecular weight pre-gel for a cross-linked branched polyester comprising:a) reacting polyester precursor repeat units via condensation polymerization in a continuous or semi-continuous, or batch reactor stage to form a low molecular weight pre-gel; andb) further reacting the low molecular weight pre-gel via condensation polymerization in a continuous thin-film reactive vacuum processing stage to form a high molecular weight pre-gel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.