US3941747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin polymer compositions stabilized against discoloration
Assignee: Chevron USA Inc
•
Filing: 1973-11-27
•
Granted: 1976-03-02
•
Expires: 1993-11-27
Abstract
Abstract Olefin polymer compositions are provided having enhanced stability against discoloration. The polymer compositions consist essentially of a normally solid olefin polymer such as polyethylene having incorporated therein, on a weight basis, 0.001 - 0.2 percent of 2,6-ditertiarybutyl-4-methylphenol* and 0.0005 - 0.4 percent of 2,6-ditertiarybutyl-4-ethylphenol**, with the quantity of 2,6-ditertiarybutyl-4-ethylphenol being present in a minimum amount of 50 weight % of the 2,6-ditertiarybutyl-4-methylphenol. *In subsequent discussions, this chemical sometimes will be referred to as BHT, which signifies butylated hydroxy toluene **In subsequent discussions, 2,6-ditertiarybutyl-4-ethylphenol sometimes will be referred to as BHEB, which signifies butylated hydroxy ethylbenzene.
Inventors
- 👤 Clarence Edward Roth, Jr.
- 👤 Joseph Arnold Lasswell
- 👤 William Dennis Bybee
- 👤 Earl Brewer Parker, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:53
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
An olefin polymer composition consisting essentially of a normally solid olefin polymer having incorporated therein, on a weight basis, 0.001 - 0.2 percent of 2,6-di-tertiarybutyl-4-methylphenol and 0.0005 - 0.4 percent of 2,6-ditertiarybutyl-4-ethylphenol, the 2,6-ditertiarybutyl-4-ethylphenol being present in an amount constituting at least 50% by weight of the 2,6-ditertiarybutyl-4-methylphenol, said olefin polymer having polymerized therein at least 90 weight percent of a monoolefin of the group consisting of ethylene and propylene.
Claim 2
Dependent Claim
70 words
An olefin polymer composition consisting essentially of a normally solid olefin polymer having incorporated therein, on a weight basis, 0.001 - 0.2 percent of 2,6-di-tertiarybutyl-4-methylphenol and 0.0005 - 0.4 percent of 2,6-ditertiarybutyl-4-ethylphenol, the 2,6-ditertiarybutyl-4-ethylphenol being present in an amount constituting at least 50% by weight of the 2,6-ditertiarybutyl-4-methylphenol, said olefin polymer having polymerized therein at least 90 weight percent of a monoolefin of the group consisting of ethylene and propylene.
Claim 3
Dependent Claim
13 words
A composition of claim 1 wherein the olefin polymer is an ethylene homopolymer.
Claim 4
Dependent Claim
14 words
A composition of claim 1 wherein the olefin polymer is a crystalline propylene polymer.
Claim 5
Independent Claim
76 words
A method for retarding the yellowing of a normally solid olefin polymer containing 2,6-ditertiarybutyl-4-methyl-phenol as a stabilizer, which consists essentially of dispersing 0.0005 - 0.4 weight percent of 2,6-ditertiarybutyl-4-ethylphenol throughout said olefin polymer, said 2,6-ditertiarybutyl-4-ethylphenol being added in an amount constituting at least 50% by weight of the 2,6-ditertiarybutyl-4-methylphenol contained in said olefin polymer, said olefin polymer having polymerized therein at least 90 weight percent of a monoolefin of the group consisting of ethylene and propylene.
Claim 6
Independent Claim
76 words
A method for retarding the yellowing of a normally solid olefin polymer containing 2,6-ditertiarybutyl-4-methyl-phenol as a stabilizer, which consists essentially of dispersing 0.0005 - 0.4 weight percent of 2,6-ditertiarybutyl-4-ethylphenol throughout said olefin polymer, said 2,6-ditertiarybutyl-4-ethylphenol being added in an amount constituting at least 50% by weight of the 2,6-ditertiarybutyl-4-methylphenol contained in said olefin polymer, said olefin polymer having polymerized therein at least 90 weight percent of a monoolefin of the group consisting of ethylene and propylene.
References Cited (Backward Citations)
US2785188A
Cited
US2956306A
Cited
US2957849A
Cited
US3069369A
Cited
US3103501A
Cited
US3351678A
Cited
US3349072A
Cited
US3553272A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |