US4025487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions stabilized with 4-aroylamido-2-alkyl-6-t-butylphenols
Assignee: Novartis Corp
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Filing: 1975-06-30
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Granted: 1977-05-24
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Expires: 1995-06-30
Abstract
Abstract 4-Aroylamido-2-alkyl-6-t-butylphenols can be prepared by reacting 2-alkyl-6-t-butyl-4-aminophenol with an aroylhalide. The products are useful as stabilizers of organic materials subject to thermal and ultraviolet light degradation and especially useful as butadiene rubber stabilizers.
Inventors
- 👤 Martin Dexter
- 👤 Martin Knell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:08
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
45 words
A composition of matter comprising a diene rubber stabilized against oxidative deterioration with 0.05% to 2% by weight of the rubber of a compound having the formula ##STR6## wherein aryl is phenyl, naphthyl or alkyl substituted phenyl where alkyl has up to 9 carbon atoms.
Claim 2
Dependent Claim
45 words
A composition of matter comprising a diene rubber stabilized against oxidative deterioration with 0.05% to 2% by weight of the rubber of a compound having the formula ##STR6## wherein aryl is phenyl, naphthyl or alkyl substituted phenyl where alkyl has up to 9 carbon atoms.
Claim 3
Dependent Claim
11 words
A composition according to claim 1 which is stabilized with 4-benzamido-2,6di-t-butylphenol.
Claim 4
Dependent Claim
17 words
A composition according to claim 1 which is stabilized with a 4-aroylamido-2,6-di-t-butylphenol and an ultraviolet light absorber.
Claim 5
Dependent Claim
15 words
A composition of claim 1 wherein polybutadiene, polyisoprene and butadiene-styrene copolymer is stabilized with 4-benzamido-2,6-di-t-butylphenol.
Claim 6
Dependent Claim
10 words
A composition of claim 1 wherein the stabilizer is 4-o-toluylamido-2,6-di-t-butylphenol.
References Cited (Backward Citations)
US2654722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |