4-Alkyl-1,4-diaza-5-oxo-cycloheptanes and their 1-oxyls
US3966711A · kind A · utility
27Cited by
1References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1974 |
| Grant date | Jun 29, 1976 |
| Priority date | — |
| Expiry date | Jun 5, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/3442
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
2,2,7,7-Tetraalkyl- and 2,7-dispiroalkylene-5-oxo-1,4-diazacycloheptanes substituted in 4-position by mono- or tetravalent radicals are powerful light-stabilizers for organic polymers. They possess higher compatibility than their 4-unsubstituted homologues, from which they may synthesized by reactions known for N-alkylation. Preferred substituents in 4-position are alkyl, alkylene, alkenyl, aralkyl and esteralkyl groups. The 1-nitroxyls derived from the imidazolidines by oxydation with hydrogen peroxide or percarboxylic acids too are good light stabilizers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.