4,4'-Bipiperidylidene derivatives and their use as stabilizers
US4055536A · kind A · utility
5Cited by
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13Claims
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Assignee
Inventors
Key dates
| Filing date | Jul 30, 1976 |
| Grant date | Oct 25, 1977 |
| Priority date | — |
| Expiry date | Jul 30, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/34926
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
New 2,2',6,6'-tetraalkyl-2,2',6,6'-tetramethyl-4,4'-bipiperidylidene derivatives, which are optionally substituted in the 1,1',3,3',5, and 5' positions are useful as stabilizers of organic substrates, particularly synthetic polymers, against photo- and thermal-deterioration. They may be prepared by condensing a corresponding 2,6-dialkyl-2,6-dimethyl-4-piperidone and then optionally introducing the desired substituents at the 1- and 1'-positions in the resulting bipiperidylidene derivative.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.