US4020042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenolic antioxidants
Assignee: Goodyear Tire and Rubber Co
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Filing: 1974-11-20
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Granted: 1977-04-26
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Expires: 1994-11-20
Abstract
Abstract A phenolic antioxidant is combined with a sulfur-containing compound to form a larger antioxidant molecule. The resulting compounds are non-staining and prevent polymer degradation.
Inventors
- 👤 Kirkwood S. Cottman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:06
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C07; C07C; C07C323/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
147 words
Phenolic compounds with a structural formula selected from the group consisting of ##STR4## wherein R 1 and R 2 are the same or different radicals selected from the group consisting of hydrogen, alkyl radicals having from 1 to 10 carbon atoms, cycloalkyl radicals having from 5 to 8 carbon atoms, aralkyl radicals having from 7 to 9 carbon atoms, and substituted and unsubstituted aryl radicals containing from 6 to 8 carbon atoms, m is 1 or 2, A is selected from the group consisting of --K--X--, --X--Z--X-- or --T--Z--X-- and B is --X--Z--X-- wherein K is an alkylene group containing from 1 to 10 carbon atoms, Z is an alkylene radical containing from 2 to 10 carbon atoms, X is oxygen, T is sulfur, Y is a bivalent radical selected from the group consisting of --O--, --S-- and alkylene radicals containing from 1 to 5 carbon atoms.
Claim 2
Dependent Claim
147 words
Phenolic compounds with a structural formula selected from the group consisting of ##STR4## wherein R 1 and R 2 are the same or different radicals selected from the group consisting of hydrogen, alkyl radicals having from 1 to 10 carbon atoms, cycloalkyl radicals having from 5 to 8 carbon atoms, aralkyl radicals having from 7 to 9 carbon atoms, and substituted and unsubstituted aryl radicals containing from 6 to 8 carbon atoms, m is 1 or 2, A is selected from the group consisting of --K--X--, --X--Z--X-- or --T--Z--X-- and B is --X--Z--X-- wherein K is an alkylene group containing from 1 to 10 carbon atoms, Z is an alkylene radical containing from 2 to 10 carbon atoms, X is oxygen, T is sulfur, Y is a bivalent radical selected from the group consisting of --O--, --S-- and alkylene radicals containing from 1 to 5 carbon atoms.
Claim 3
Dependent Claim
27 words
Polypropylene according to claim 1 wherein the compound is selected from the group consisting of (3,5-di-t-butyl-4-hydroxybenzyl) 2-mercaptopropionate, 4-(3,5-di-t-butyl-4-hydroxyphenyl)-2-butyl 3-mercaptopropionate, 3-(3,5-di-t-butyl-4-hydroxyphenyl) propyl 3-mercaptopropionate, (3,5-di-t-butyl-4-hydroxybenzyl) 2-mercaptoacetate and 3-(3,5-di-t-butyl-4-hydroxyphenyl)-2,2-dimethylpropyl 3-mercaptopropionate.
Claim 4
Dependent Claim
17 words
An ole fin polymer having incorporated therein in an antioxidant amount a compound according to claim 1.
Claim 5
Dependent Claim
14 words
Polypropylene having incorporated therein in an antioxidant amount a compound according to claim 1.
References Cited (Backward Citations)
US2951052A
Cited
US3144422A
Cited
US3496211A
Cited
US3536661A
Cited
US3676471A
Cited
US3637809A
Cited
US3829481A
Cited
US3644485A
Cited
US3795700A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |