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US3625913A
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{37 n{40 -alkyl, and n{40 -aryl-n-fluorenyl-p-phenylene-diamines as antiozonants in natural and synthetic diene rubbers{38
Assignee: Bridgestone Firestone Inc
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Filing: 1969-05-22
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Granted: 1971-12-07
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Expires: 1989-05-22
Abstract
Abstract N''-alkyl- and N''-aryl-N-fluorenyl-p-phenylenediamines are new compounds. They are antiozonants in natural and synthetic diene rubbers.
Inventors
- 👤 Jerry Donald Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:34
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/18; C07; C07C; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/06; C07C2603/10; C07C2603/12; C07C2603/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
11 words
The composition of claim 1 in which the antiozonant is N-fluorenyl-N''-phenyl-paraphenylenediamine.
Claim 2
Dependent Claim
11 words
The composition of claim 1 in which the antiozonant is N-fluorenyl-N''-isopropyl-paraphenylenediamine.
Claim 3
Dependent Claim
97 words
A sulfur-cured, oil-diluted, tire sidewall in which the rubber is 77.5 percent vulcanized butadiene-styrene copolymer, which rubber includes an antiozonant amount of a compound selected from the group consisting of N-fluorenyl-N''-alkyl and N''-aryl-paraphenylenediamines in which (a) the alkyl derivatives include (1) alkyl groups of one to 20 carbon atoms and hydroxyl and alkoxy derivatives thereof in which the alkoxy group contains one to four carbon atoms, and (2) morpholinyl and nitrogen-heterocyclic groups and (b) the aryl derivatives are benzenoid groups and their hydroxy and alkoxy derivatives in which the alkoxy groups contain one to four carbon atoms.
Claim 4
Dependent Claim
11 words
The tire of claim 4 in which the antiozonant is N-fluorenyl-N''-phenyl-paraphenylenediamine.
Claim 5
Dependent Claim
11 words
The tire of claim 4 in which the antiozonant is N-fluorenyl-N''-isopropyl-paraphenylenediamine.
Claim 6
Dependent Claim
105 words
A sulfur-cured, oil-diluted, tire sidewall which is composed at least 77.5 percent of butadiene-styrene copolymer and includes not over 22.5 percent of rubber reclaim and contains an antiozonant amount of a compound selected from the group consisting of N-fluorenyl-N''-alkyl and N''-aryl-phenylenediamines in which (a) the alkyl derivatives include (1) alkyl groups of one to 20 carbon atoms and hydroxyl and alkoxy derivatives thereof in which the alkoxy group contains one to four carbon atoms, and (2) morpholinyl and nitrogen-heterocyclic groups and (b) the aryl derivatives are benzenoid groups and their hydroxy and alkoxy derivatives in which the alkoxy groups contain one to four carbon atoms.
Claim 7
Dependent Claim
14 words
The sulfur-cured oil-diluted tire sidewall of claim 7 in which the antiozonant is N-fluorenyl-N''-phenyl-paraphenylenediamine.
Claim 8
Dependent Claim
14 words
A sulfur-cured oil-diluted tire sidewall of claim 7 in which the antiozonant is N-fluorenyl-N''-isopropyl-paraphenylenediamine.
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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |