Patent US3931103A successfully refreshed from Google Patents.
US3931103A
Expired / Lapsed
US
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Copper inhibitors for polyolefins
Assignee: Wyeth Holdings LLC
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Filing: 1974-10-18
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Granted: 1976-01-06
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Expires: 1994-10-18
Abstract
Abstract Compounds of the formula ##SPC1## Wherein R is an alkyl of 1 to 8 carbon atoms and X is hydrogen or --OR, are useful, in combination with hindered-phenol antioxidants, for inhibiting thermal degradation of polyolefins, especially polypropylene, in contact with copper as metal, alloys, oxides, or salts. Such compounds can be prepared by reacting hydrazine with a naphthoic acid ester which may have an alkoxy group in the 3- position to form an intermediate which reacts with 3-alkoxy-2-naphthoyl chloride to form said compounds.
Inventors
- 👤 William Baptist Hardy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:36
CPC Classifications
C; C07; C07C; C07C243/00; C07C243/24; C07C243/38; C08; C08K; C08K5/00; C08K5/16; C08K5/22; C08K5/24; C08K5/25
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
45 words
A stabilizer composition useful in the enhancement of the resistance of polyolefins to copper-catalyzed thermal degradation comprising, in combination, a hindered-phenol antioxidant and a compound of the formula ##SPC4## wherein R is alkyl of 1 to 8 carbon atoms, and X is hydrogen or --OR.
Claim 2
Dependent Claim
45 words
A stabilizer composition useful in the enhancement of the resistance of polyolefins to copper-catalyzed thermal degradation comprising, in combination, a hindered-phenol antioxidant and a compound of the formula ##SPC4## wherein R is alkyl of 1 to 8 carbon atoms, and X is hydrogen or --OR.
Claim 3
Dependent Claim
17 words
A composition as defined in claim 1 wherein R is methyl and X is hydrogen or methoxy.
Claim 4
Dependent Claim
11 words
A composition as defined in claim 2 wherein X is methoxy.
Claim 5
Dependent Claim
14 words
A composition as defined in claim 1 wherein said hindered-phenol antioxidant is pentaerythrityl tetrakis-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate.
Claim 6
Dependent Claim
16 words
A composition comprising a polyolefin and a stabilizing amount of the stabilizer composition of claim 1.
Claim 7
Dependent Claim
12 words
A composition as defined in claim 5 wherein said polyolefin is polypropylene.
Claim 8
Dependent Claim
16 words
A composition comprising a polyolefin and a stabilizing amount of the stabilizing composition of claim 2.
Claim 9
Dependent Claim
16 words
A composition comprising a polyolefin and a stabilizing amount of the stabilizing composition of claim 3.
Claim 10
Dependent Claim
59 words
Polypropylene stabilized against copper-catalyzed thermal degradation by the combination of (a) an amount of a hindered-phenol antioxidant sufficient to stabilize said polypropylene against thermal degradation in the absence of copper and (b) an amount of a compound of claim 1 sufficient to reduce the effects of copper on such thermal degradation even in the presence of said hindered-phenol antioxidant.
Claim 11
Dependent Claim
14 words
A composition as defined in claim 9 wherein said compound has the formula ##SPC5##
Claim 12
Dependent Claim
17 words
A composition as defined in claim 10 wherein R is methyl and X is hydrogen or methoxy.
Claim 13
Dependent Claim
11 words
A composition as defined in claim 11 wherein X is methoxy.
Claim 14
Dependent Claim
15 words
A composition as defined in claim 9 wherein said hindered phenol antioxidant is pentaerythrityl tetrakis-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate.
References Cited (Backward Citations)
US3734885A
Cited
US3849942A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |