Substituted piperazine dione oxyls and hydroxides and polymer compositions stabilized thereby
US3936456A · kind A · utility
12Cited by
4References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1973 |
| Grant date | Feb 3, 1976 |
| Priority date | — |
| Expiry date | Jul 16, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/3462
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Substituted piperazine dione oxyls and hydroxides are stabilizers for synthetic polymeric materials normally subject to deterioration caused by ultraviolet light. The compounds may be prepared by first preparing a substituted piperazine dione with subsequent oxidation of the piperazine dione to yield the oxyl and reduction of the oxyl to yield the hydroxide derivative. Polymeric compositions containing these stabilizers may also contain a hindered phenolic compound. A typical embodiment is 15-n-octadecyl-7-oxyl-7,15-diazadispiro[5,1,5,3]hexadecane-14,16-dione.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.