Patent US4052361A successfully refreshed from Google Patents.
US4052361A
Expired / Lapsed
US
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N-(2,2-dimethyl-6,6-di(lower alkyl)-4-piperidinyl)-amides 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: 1977-10-04
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Expires: 1994-12-30
Abstract
Abstract Compounds of the formula: ##STR1## 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 alkyl of 1 to 4 carbon atoms are useful as light stabilizers in polyolefins. They may be prepared by reacting 3,5-dialkyl-4-hydroxybenzoic acid with 4-amino-2,2-dimethyl-6,6-di(lower alkyl)piperidine 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
2026-11-03 17:01
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3432; C08K5/3435; C07; C07D; C07D211/00; C07D211/04; C07D211/06; C07D211/36; C07D211/56; C07D211/58
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
55 words
A polyolefin stabilized against the deteriorating effects of light by having incorporated therein an effective amount of a light stabilizer of the formula: ##STR3## 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 alkyl of 1 to 4 carbon atoms.
Claim 2
Dependent Claim
55 words
A polyolefin stabilized against the deteriorating effects of light by having incorporated therein an effective amount of a light stabilizer of the formula: ##STR3## 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 alkyl of 1 to 4 carbon atoms.
Claim 3
Dependent Claim
16 words
A composition as defined in claim 1 wherein R 1 and R 2 are each t-butyl.
Claim 4
Dependent Claim
16 words
A composition as defined in claim 1 wherein R 3 and R 4 are each methyl.
Claim 5
Dependent Claim
25 words
A composition as defined in claim 1 wherein R 1 and R 2 are each t-butyl and R 3 and R 4 are each methyl.
Claim 6
Dependent Claim
12 words
A composition as defined in claim 1 wherein said polyolefin is polypropylene.
Claim 7
Dependent Claim
12 words
A composition as defined in claim 4 wherein said polyolefin is polypropylene.
Claim 8
Dependent Claim
37 words
A compound of the formula: ##STR4## 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 alkyl of 1 to 4 carbon atoms.
Claim 9
Dependent Claim
37 words
A compound of the formula: ##STR4## 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 alkyl of 1 to 4 carbon atoms.
Claim 10
Dependent Claim
16 words
A compound as defined in claim 7 wherein R 1 and R 2 are each t-butyl.
Claim 11
Dependent Claim
16 words
A compound as defined in claim 7 wherein R 3 and R 4 are each methyl.
Claim 12
Dependent Claim
25 words
A compound as defined in claim 7 wherein R 1 and R 2 are each t-butyl and R 3 and R 4 are each methyl.
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) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |