Substituted piperazines and polymeric compositions stabilized thereby
US4007157A · kind A · utility
14Cited by
2References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1975 |
| Grant date | Feb 8, 1977 |
| Priority date | — |
| Expiry date | Jun 27, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/3465
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Substituted piperazines are stabilizers for synthetic polymeric materials normally subject to deterioration caused by ultraviolet light. The compounds are prepared by the alkylation reaction between a substituted piperazine dione and an organic halide followed by reduction with lithium aluminum hydride. Polymeric compsitions containing these stabilizers may also contain a hindered phenolic compound. A typical embodiment is 15,15'-dodecamethylene-bis(7,15-diazadispiro[5,1,5,3]hexadecane).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.