US4430235A
Expired / Lapsed
US
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Polymeric antioxidants
Assignee: Witco Corp
•
Filing: 1981-07-17
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Granted: 1984-02-07
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Expires: 2001-07-17
Abstract
Abstract Polymeric antioxidants comprising polyorganosiloxane backbones having joined thereto, by non-hydrolyzable linkages, aromatic antioxidant moieties.
Inventors
- 👤 Nan S. Chu
- 👤 Lawrence Marlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:25
CPC Classifications
C; C10; C10M; C10M155/00; C10M155/02; C08; C08G; C08G77/00; C08G77/04; C08G77/38; C08G77/382; C09; C09K; C09K15/00; C09K15/04; C09K15/32; C09K15/328; C10M2229/00; C10M2229/04; C10M2229/045; C10M2229/046; C10M2229/047; C10M2229/048; C10M2229/05; C10M2229/052
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
74 words
A polymeric antioxidant of the formula: ##STR4## wherein x ranges from 2 to 100, y ranges from 20 to 300, the ratio of x:y is at least 1:10, n ranges from 2 to 12, X is selected from the group consisting of --NH--, --NHR--, --O-- and --CHN--, n ranges from 2 to 12, X is selected from the group consisting of --NH--, --NHR--, --O-- and --CHN--, and and Ant is an aromatic antioxidant moiety.
Claim 2
Dependent Claim
74 words
A polymeric antioxidant of the formula: ##STR4## wherein x ranges from 2 to 100, y ranges from 20 to 300, the ratio of x:y is at least 1:10, n ranges from 2 to 12, X is selected from the group consisting of --NH--, --NHR--, --O-- and --CHN--, n ranges from 2 to 12, X is selected from the group consisting of --NH--, --NHR--, --O-- and --CHN--, and and Ant is an aromatic antioxidant moiety.
Claim 3
Dependent Claim
13 words
A polymeric antioxidant according to claim 1 wherein Ant is a phenolic moiety.
Claim 4
Dependent Claim
21 words
A polymeric antioxidant as in claim 1 wherein the ratio of x:y is in the range of from 1:5 to 1:1.
Claim 5
Dependent Claim
29 words
A polymeric antioxidant of the formula: ##STR5## wherein x ranges from 2 to 100, y ranges from 20 to 300 and the ratio of x:y is at least 1:10.
Claim 6
Dependent Claim
29 words
A polymeric antioxidant of the formula: ##STR5## wherein x ranges from 2 to 100, y ranges from 20 to 300 and the ratio of x:y is at least 1:10.
Claim 7
Dependent Claim
27 words
A lubricant composition containing a minor amount of a polymeric antioxidant according to claim 1, 2, 3, or 4 and a major amount of a polyester lubricant.
References Cited (Backward Citations)
US3328450A
Cited
US3579467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |