US3928357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted piperazine diones and polymeric compositions stabilized thereby
Assignee: Novartis Corp
•
Filing: 1973-08-24
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Granted: 1975-12-23
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Expires: 1993-08-24
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''-dodecamethylene-bis(7,15diazadispiro(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
2026-11-03 22:17
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3442; C08K5/3462
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
9 words
A compound according to claim 1 having the formula
Claim 4
Dependent Claim
44 words
A compound according to claim 2 wherein n is 1 or 2; when n is 1, R3 is alkyl having from six to 18 carbon atoms or benzyl; when n is 2, R3 is alkylene having from two to 12 carbon atoms or p-xylylene.
Claim 5
Dependent Claim
18 words
A compound according to claim 1 wherein R1 and R2 are independently of each other methyl or ethyl.
Claim 6
Dependent Claim
48 words
A compound according to claim 1 wherein R1 and R2 are methyl; n is 1 or 2; when n is 1, R3 is alkyl having from six to 18 carbon atoms; when n is 2, R3 is alkylene having from two to 12 carbon atoms or p-xylylene group.
Claim 7
Dependent Claim
9 words
A compound according to claim 1 which is 15-n-octadecyl-7,15-diazadispiro(5,1,5,3)hexadecane-14,16-dione.
Claim 8
Dependent Claim
9 words
A compound according to claim 1 which is 15-benzyl-7,15-diazadispiro(5,1,5,3)hexadecane-14,16-dione.
Claim 9
Dependent Claim
12 words
A compound according to claim 1 which is 15,15''-(2'''',3'''',5'''', 6''''-tetramethyl p-xylilidenyl)bis(7,15-diazadispiro(5,1,5, 3)hexadecane-14,16-dione).
Claim 10
Dependent Claim
10 words
A compound according to claim 1 which is 15,15''-n-dodecamethylene bis(7,15-diazadispiro(5,1,5,3)hexadecane-14,16-dione).
Claim 11
Dependent Claim
10 words
A compound according to claim 1 which is 15,15''-n-octamethylene bis(7,15-diazadispiro(5,1,5,3)hexadecane-14,16-dione).
Claim 12
Dependent Claim
15 words
A compound according to claim 1 which is 15,15'',15''''-(2,4,6-trimethyl- Alpha , Alpha '', Alpha ''''-mesitylidene)tris(7,15-diazadispiro(5,1,5,3)hexadecane-14,16-dione).
Claim 13
Dependent Claim
10 words
A compound according to claim 1 which is 15,15''-tetramethylene bis(7,15-diazadispiro(5,1,5,3)hexadecane-14,16-dione).
Claim 14
Dependent Claim
10 words
A compound according to claim 1 which is 4-n-octadecyl-2,2, 6,6-tetramethyl-3,5-diketopiperazine.
Claim 15
Dependent Claim
9 words
A compound according to claim 1 which is 15-methyl-7,15-diazadispiro(5,1,5,3)hexadecane-14,16-dione.
Claim 16
Dependent Claim
9 words
A compound according to claim 1 which is 15-n-octyl-7,15-diazadispiro(5,1,5,3)hexadecane-14,16-dione.
Claim 17
Dependent Claim
9 words
A compound according to claim 1 which is 4,4''(n-dodecamethylene)bis(2,2,6,6-tetramethyl-3,5-diketopiperazine).
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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |