Patent US3880952A successfully refreshed from Google Patents.
US3880952A
Expired / Lapsed
US
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Photodegradable polyethylene composition containing poly(4-methylpentene) and a photosensitizer
Assignee: Imperial Chemical Industries Ltd
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Filing: 1972-05-26
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Granted: 1975-04-29
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Expires: 1992-05-26
Abstract
Abstract Polyethylene contains poly(4-methylpentene-1) and a photosensitiser such as iron stearate or p-lauryl acetophenone. The combination of the two additives renders the composition more liable to photodegradation than when either additive is used alone.
Inventors
- 👤 Derek Samuel Brackman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:59
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0033; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/18; C08L23/20; Y; Y10; Y10S; Y10S260/00; Y10S260/43
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
36 words
A PHOTODEGRADABLE POLYETHYLENE COMPOSITION WHICH CONTAINS 0.01 TO 2% BY WEIGHT OF POLY (4-METHYLPENTENE-1) AND 0.001% TO 2% BY WEIGHT OF A PHOTOSENSITISER SELECTED FROM THE GROUP CONSISTING OF AROMATIC KETONES AND COMPOUNDS OF TRANSITION METALS.
Claim 2
Dependent Claim
36 words
A PHOTODEGRADABLE POLYETHYLENE COMPOSITION WHICH CONTAINS 0.01 TO 2% BY WEIGHT OF POLY (4-METHYLPENTENE-1) AND 0.001% TO 2% BY WEIGHT OF A PHOTOSENSITISER SELECTED FROM THE GROUP CONSISTING OF AROMATIC KETONES AND COMPOUNDS OF TRANSITION METALS.
Claim 3
Dependent Claim
21 words
A photodegradable polyethylene composition according to claim 1, in which the concentration of the poly(4-methylpentene-1) is 0.1 to 2% by weight.
Claim 4
Dependent Claim
21 words
A photodegradable polyethylene composition according to claim 1, in which the concentration of the photosensitiser is 0.01 to 1% by weight.
Claim 5
Dependent Claim
16 words
A photodegradable polyethylene composition as claimed in claim 1, in which the photosensitiser is p-lauryl acetophenone.
Claim 6
Dependent Claim
15 words
A wrapping film which is formed of a photodegradable polyethylene composition according to claim 1.
Claim 7
Dependent Claim
12 words
A container made of a photodegradable polyethylene composition according to claim 1.
Claim 8
Dependent Claim
13 words
String which is made of a photodegradable polyethylene composition according to claim 1.
Claim 9
Dependent Claim
18 words
An article of merchandise packed in a material made of a polyethylene composition as claimed in claim 1.
Claim 10
Dependent Claim
25 words
A photodegradable polyethylene composition which contains 0.1 to 2% by weight of poly(4-methylpentene-1) and as a photosensitiser 0.01 to 1% by weight of p-lauryl acetophenone.
Claim 11
Dependent Claim
25 words
A photodegradable polyethylene composition which contains 0.1 to 2% by weight of poly(4-methylpentene-1) and as a photosensitiser 0.01 to 1% by weight of p-lauryl acetophenone.
References Cited (Backward Citations)
US2680756A
Cited
US3111533A
Cited
US3269963A
Cited
US3341357A
Cited
US3575904A
Cited
US3592792A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |