Patent US3988293A successfully refreshed from Google Patents.
US3988293A
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US
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Stabilizer system for polyolefins
Assignee: Phillips Petroleum Co
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Filing: 1975-05-28
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Granted: 1976-10-26
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Expires: 1995-05-28
Abstract
Abstract The addition of a minor amount of distearyl pentaerythritol diphosphite to olefin polymers containing 2-hydroxy-4-n-octoxybenzophenone as the ultraviolet stabilizer increases the ultraviolet resistance of the polyolefins. Olefin polymers containing these stabilizers can be used in the production of items that will be brought into contact with food products.
Inventors
- 👤 Kenneth R. Mills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:29
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/132; C08K5/49; C08K5/51; C08K5/52; C08K5/527
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
35 words
A method for stabilizing an olefin polymer against deterioration in the presence of ultraviolet radiation which comprises the addition of a stabilizing amount of 2-hydroxy-4-n-octoxybenzophenone in combination with a stabilizing amount of distearyl pentaerythritol diphosphite.
Claim 2
Independent Claim
35 words
A method for stabilizing an olefin polymer against deterioration in the presence of ultraviolet radiation which comprises the addition of a stabilizing amount of 2-hydroxy-4-n-octoxybenzophenone in combination with a stabilizing amount of distearyl pentaerythritol diphosphite.
Claim 3
Dependent Claim
55 words
The method of claim 1 wherein the 2-hydroxy-4-n-octoxybenzophenone is added in an amount in the range of about 0.2 to about 4 parts stabilizer per hundred parts of polymer and the distearyl pentaerythritol diphosphite is added in an amount in the range of about 0.01 to about 0.5 parts phosphite per hundred parts of polymer.
Claim 4
Dependent Claim
48 words
The method of claim 1 wherein the 2-hydroxy-4-n-octoxybenzophenone is added in an amount in the range of about 0.4 to about 1.5 parts stabilizer per hundred parts of polymer and the distearyl pentaerythritol diphosphite is added in an amount of about 0.1 parts per hundred parts of polymer.
Claim 5
Dependent Claim
33 words
A composition of matter stabilized against deterioration in the presence of ultraviolet radiation comprising an olefin polymer and a stabilizing amount of 2-hydroxy-4-n-octoxybenzophenone in combination with a stabilizing amount of distearyl pentaerythritol diphosphite.
Claim 6
Dependent Claim
33 words
A composition of matter stabilized against deterioration in the presence of ultraviolet radiation comprising an olefin polymer and a stabilizing amount of 2-hydroxy-4-n-octoxybenzophenone in combination with a stabilizing amount of distearyl pentaerythritol diphosphite.
Claim 7
Dependent Claim
30 words
The stabilized composition of claim 4 wherein the olefin polymer is chosen from the group consisting of homopolymers and copolymers of monoolefins containing 2 to 8 carbon atoms per molecule.
Claim 8
Dependent Claim
41 words
The stabilized composition of claim 4 wherein the composition contains in the range of about 0.2 to about 4 parts 2-hydroxy-4-n-octoxybenzophenone per hundred parts of polymer and about 0.01 to about 0.5 parts distearyl pentaerythritol diphosphite per hundred parts of polymer.
Claim 9
Dependent Claim
38 words
The stabilized composition of claim 4 wherein the composition contains in the range of about 0.4 to about 1.5 parts 2-hydroxy-4-n-octoxy-benzophenone per hundred parts of polymer and about 0.1 parts distearyl pentaerythritol diphosphite per hundred parts of polymer.
Claim 10
Dependent Claim
15 words
The method of claim 1 comprising the addition of stabilizing amounts of dilaurylthiodipropionate and tetrakis[methylene(3,5-di-t-butyl-4-hydroxyhydrocinnamate)]methane.
Claim 11
Dependent Claim
16 words
A stabilized composition of matter of claim 4 comprising a stabilizing amount of dilaurylthiodipropionate and tetrakis[methylene(3,5-di-t-butyl-4-hydroxyhydrocinnamate)]methane.
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) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |