US3972927A
Expired / Lapsed
US
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Alkylamides of hindered 3,5-dialkyl-4-hydroxybenzoic acids and use as light stabilizers in polyolefins
Assignee: Wyeth Holdings LLC
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Filing: 1974-12-30
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Granted: 1976-08-03
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Expires: 1994-12-30
Abstract
Abstract Compounds of the formula: ##SPC1## Wherein R 1 and R 2 are each branch-chain alkyl of 3 to 8 carbon atoms and R 3 and R 4 are each hydrogen, alkyl of 1 to 18 carbon atoms, or cycloalkyl of 5 or 6 carbon atoms are useful as light stabilizers in polyolefins. They may be prepared (a) by reacting the 3,5-di-alkyl-4-hydroxybenzoyl chloride with the appropriate amine in the presence of an acid acceptor or (b) by reacting the corresponding benzoic acid with the appropriate amine in the presence of a carbodiimide as dehydrating agent.
Inventors
- 👤 Peter Vincent Susi
- 👤 John Christian Oppelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:30
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
43 words
A compound of the formula: ##SPC3## wherein R 1 and R 2 are each branched-chain alkyl of 3 to 8 carbon atoms and R 3 and R 4 are both alkyl of 8 carbon atoms, or cycloalkyl of 5 or 6 carbon atoms.
Claim 2
Dependent Claim
43 words
A compound of the formula: ##SPC3## wherein R 1 and R 2 are each branched-chain alkyl of 3 to 8 carbon atoms and R 3 and R 4 are both alkyl of 8 carbon atoms, or cycloalkyl of 5 or 6 carbon atoms.
Claim 3
Dependent Claim
16 words
A compound as defined in claim 1 wherein R 1 and R 2 are each t-butyl.
Claim 4
Dependent Claim
18 words
A compound as defined in claim 1 wherein R 3 and R 4 are both cyclohexyl or n-octyl.
Claim 5
Dependent Claim
16 words
A compound as defined in claim 3 wherein R 1 and R 2 are each t-butyl.
Claim 6
Dependent Claim
10 words
A compound as defined in claim 4 which is N,N-dicyclohexyl-3,5-di-t-butyl-4-hydroxybenzamide.
Claim 7
Dependent Claim
10 words
A compound as defined in claim 4 which is N,N-di-n-octyl-3,5-di-t-butyl-4-hydroxybenzamide.
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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |