US4051137A
Expired / Lapsed
US
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Substituted piperazine diones and polymeric compositions stabilized thereby
Assignee: Novartis Corp
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Filing: 1975-11-19
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Granted: 1977-09-27
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Expires: 1995-11-19
Abstract
Abstract Substituted piperazine diones 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. Polymeric compositions containing these stabilizers may also contain a hindered phenolic compound. A typical embodiment is 15,15'-dodecamethylenebis(7,15-diazadispiro[5,1,5,3]hexadecane-14,16-dione).
Inventors
- 👤 Chester E. Ramey
- 👤 John J. Luzzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:39
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3442; C08K5/3462; C08K5/3465
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A compound of the formula ##STR14## wherein R 1 and R 2 are together with the carbon to which they are bound form a cyclopentyl or cyclohexyl ring, which is unsubstituted or substituted with a methyl group, and R 3 is benzyl.
Claim 2
Dependent Claim
42 words
A compound of the formula ##STR14## wherein R 1 and R 2 are together with the carbon to which they are bound form a cyclopentyl or cyclohexyl ring, which is unsubstituted or substituted with a methyl group, and R 3 is benzyl.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |