US4075146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized polyolefin compositions
Assignee: Dart Industries Inc
•
Filing: 1976-01-02
•
Granted: 1978-02-21
•
Expires: 1996-01-02
Abstract
Abstract A polyolefin composition having excellent stability against degradation caused by exposure to heat and oxygen in the presence of copper, which composition is stabilized with a synergistic stabilizer system containing at least one phenolic antioxidant and calcium stearate.
Inventors
- 👤 Kornel Dezso Kiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:02
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/09; C08K5/098; C08K5/16; C08K5/22; C08K5/24; C08K5/25
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
102 words
A polyolefin resin composition in direct contact with copper or copper alloys, which composition is stabilized against oxidative degradation with a stabilizer system consisting essentially of: (a) a stabilizing amount of at least one phenolic antioxidant selected from mono or polyesters of alkane polyols, at least one of such ester groups comprising the acyl moiety ##STR5## in which R 1 and R 2 independently are a lower alkyl group containing 1 to 5 carbon atoms and x has a value of from 1 to 6, and (b) at least 100 ppm of calcium stearate based on the weight of the polyolefin resin.
Claim 2
Dependent Claim
102 words
A polyolefin resin composition in direct contact with copper or copper alloys, which composition is stabilized against oxidative degradation with a stabilizer system consisting essentially of: (a) a stabilizing amount of at least one phenolic antioxidant selected from mono or polyesters of alkane polyols, at least one of such ester groups comprising the acyl moiety ##STR5## in which R 1 and R 2 independently are a lower alkyl group containing 1 to 5 carbon atoms and x has a value of from 1 to 6, and (b) at least 100 ppm of calcium stearate based on the weight of the polyolefin resin.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein the value of x is 2.
Claim 4
Dependent Claim
22 words
The composition of claim 1, wherein R 1 and R 2 are tertiary alkyls in the 3,5 positions of the phenyl group.
Claim 5
Dependent Claim
18 words
The composition of claim 1, wherein the phenolic antioxidant is a polyol fully esterified with the acyl groups.
Claim 6
Dependent Claim
50 words
The composition of claim 1, wherein the phenolic oxidant concentration is maintained between about 0.01 to about 10 percent based on the weight of the polyolefin resin and the calcium stearate concentration is maintained between about 100 ppm and about 5000 ppm based on the weight of the polyolefin resin.
Claim 7
Dependent Claim
26 words
The composition of claim 1, wherein the polyolefin resin is selected from homopolymers and copolymers of α-olefins having 2 to 8 carbon atoms, and mixtures thereof.
Claim 8
Dependent Claim
23 words
The composition of claim 1, wherein the polyolefin resin is a polypropylene resin containing at least 60 percent by weight polymerized propylene groups.
Claim 9
Dependent Claim
18 words
The composition of claim 4, wherein the phenolic antioxidant is pentaerythritol tetraester of 3(3,5-di-t-butyl, 4-hydroxy phenyl) propionic acid.
Claim 10
Dependent Claim
31 words
The composition of claim 5 wherein the phenolic antioxidant concentration is between about 0.1 and about 1 percent and the calcium stearate concentration is between about 100 and about 500 ppm.
Claim 11
Dependent Claim
24 words
The composition of claim 7 wherein the polypropylene resin is an ethylene-propylene polymer resin containing from about 2 to about 25 percent polymerized ethylene.
Claim 12
Dependent Claim
22 words
The composition of claim 10, wherein the ethylene-propylene resin is a copolymer containing from about 3 to about 15 percent polymerized ethylene.
References Cited (Backward Citations)
US3285855A
Cited
US3280069A
Cited
US3673152A
Cited
US3660438A
Cited
US4000101A
Cited
US3772245A
Cited
US3943106A
Cited
US3954708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |