Ortho-nitrosophenols as polymerization inhibitors
US7553896B2 · kind B2 · utility
7Cited by
29References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 17, 2005 |
| Grant date | Jun 30, 2009 |
| Priority date | — |
| Expiry date | Aug 10, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2/42
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed herein is a method for inhibiting the premature polymerization of ethylenically unsaturated monomers comprising adding to said monomers an effective amount of at least one nitroso inhibitor of the structure:wherein R1, R2, R3, and R4 are independently selected from the group consisting of hydrogen, nitro, nitroso, halogen, COOR wherein R is hydrogen or alkyl, alkyl, and heteroatom-substituted alkyl; or adjacent groups R1, R2, R3, and R4 can be taken together to form a substituted or unsubstituted fused six-membered ring.Also disclosed is a composition of matter comprising:
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.