Process for purifying styrene/vinylpyridine copolymer using supercritical carbon dioxide
US4902780A · kind A · utility
11Cited by
3References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1989 |
| Grant date | Feb 20, 1990 |
| Priority date | — |
| Expiry date | Jul 28, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/54
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A basic copolymer of styrene with vinylpyridine is purified by extraction with supercritical carbon dioxide to remove residual monomers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.