US4055539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkylidene-bisphenols containing sulphur, and their use as stabilizers
Assignee: Novartis Corp
•
Filing: 1976-05-27
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Granted: 1977-10-25
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Expires: 1996-05-27
Abstract
Abstract 1,1-Bis-(3-alkyl-2-hydroxyphenyl)-3-alkylthio-butanes to -pentadecanes in which the alkyl, which is in the 3-position, is not branched at the α-carbon atom, are good stabilizers for elastomers.
Inventors
- 👤 Siegfried Rosenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:43
CPC Classifications
C; C07; C07C; C07C323/00; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/375; Y; Y10; Y10S; Y10S524/00; Y10S524/925
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
103 words
A compound of the general formula I ##STR8##wherein R 1 is an alkyl group which has 1 to 18 carbon atoms and which is not branched in the α-position, R 2 denotes a linear or branched alkyl group having 1 to 8 carbon atoms, or a hydrogen atom, R 3 denotes an alkyl group having 1 to 6 carbon atoms and R 5 denotes a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R 4 denotes a linear or branched alkyl group having 1 to 20 carbon atoms wherein the carbon chain can be interrupted by sulphur atoms.
Claim 2
Dependent Claim
103 words
A compound of the general formula I ##STR8##wherein R 1 is an alkyl group which has 1 to 18 carbon atoms and which is not branched in the α-position, R 2 denotes a linear or branched alkyl group having 1 to 8 carbon atoms, or a hydrogen atom, R 3 denotes an alkyl group having 1 to 6 carbon atoms and R 5 denotes a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R 4 denotes a linear or branched alkyl group having 1 to 20 carbon atoms wherein the carbon chain can be interrupted by sulphur atoms.
Claim 3
Dependent Claim
21 words
A compound according to claim 1, characterised in that R 4 is an alkyl radical having 4 to 16 carbon atoms.
Claim 4
Dependent Claim
17 words
A compound according to claims 1, characterised in that R 1 is a methyl or ethyl group.
Claim 5
Dependent Claim
30 words
A compound according to claims 1, characterised in that R 3 denotes alkyl of 1 to 4 carbon atoms and R 5 denotes a hydrogen atom or a methyl group.
Claim 6
Dependent Claim
18 words
A compound according to claims 1, characterised in that R 1 and R 2 represent the methyl group.
Claim 7
Dependent Claim
13 words
A compound according to claim 1 of the formula I, which is 1,1-bis-(3,5-dimethyl-2-hydroxyphenyl)-3-(n-dodecylthio)-n-butane.
Claim 8
Dependent Claim
34 words
A stabilised mixture according to claim 1 consisting of a) an elastomer and b) 0.005 to 5% by weight of at least one of the compounds of the formula I, relative to the elastomer.
Claim 9
Dependent Claim
19 words
A Mixture according to claim 7, characterised in that it contains 1,1-bis-(3,5-dimethyl-2-hydroxyphenyl)-3-(n-dodecylthio)-n-butane as the compound of the formula I.
Claim 10
Dependent Claim
14 words
A mixture according to claim 7, wherein the elastomer is natural rubber or polybutadiene.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |