Vacuum system for controlling pressure in a polyester process
US5753190A · kind A · utility
31Cited by
6References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1995 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | Jul 21, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/785
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention discloses a polymerization system having at least two reaction chambers wherein vacuum is used to remove vapors therefrom comprising a single vacuum system for supplying vacuum in increasing amounts to successive reaction chambers. Also disclosed is a polymerization process having at least first and second reaction chambers in which the pressure is decreased successively from said first chamber to a final chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.