Process inhibitor for readily polymerizable ethylenically unsaturated aromatic compounds
US4389285A · kind A · utility
3Cited by
6References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1982 |
| Grant date | Jun 21, 1983 |
| Priority date | — |
| Expiry date | Jun 21, 2002 |
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 as a process inhibitor. The DNSA is present in a concentration of about 50 to 3000 ppm, preferably about 250 to 2000 ppm, and most preferably about 500 to 1000 ppm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.