Process inhibitor for readily polymerizable ethylenically unsaturated aromatic compounds
US4439278A · kind A · utility
12Cited by
8References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1983 |
| Grant date | Mar 27, 1984 |
| Priority date | — |
| Expiry date | Apr 28, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C7/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention provides an improvement in methods for preparing and processing ethylenically unsaturated aromatic monomer. The improvement comprises employing 3,5-dinitrosalicylic acid or a derivative or isomer thereof as a process inhibitor. The process inhibitor is present in a concentration of about 50 to 3000 ppm, preferably about 250 to 2,000 ppm, and most preferably about 500 to 1,000 ppm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.