US4076655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photodegradable atactic polystyrene compositions
Assignee: BASF Corp
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Filing: 1976-03-31
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Granted: 1978-02-28
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Expires: 1996-03-31
Abstract
Abstract Polystyrene compositions, including polystyrene film and foamed polystyrene, containing as a photodegradability enhancing agent an organic carbonyl-containing compound, preferably benzoin; and such compositions containing in addition to said agent, a pro-oxidant metal salt or an acetylacetonate thereby imparting markedly enhanced photodegradability characteristics to said compositions.
Inventors
- 👤 Arne O. Finberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:05
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/07; C08K5/0008; C08K5/0025; Y; Y10; Y10S; Y10S260/00; Y10S260/43; Y10S521/00; Y10S521/916
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
27 words
A composition of atactic polystyrene blended with a small amount of benzoin, based on the weight of the polystyrene, sufficient to accelerate the photodegradation of said composition.
Claim 2
Dependent Claim
27 words
A composition of atactic polystyrene blended with a small amount of benzoin, based on the weight of the polystyrene, sufficient to accelerate the photodegradation of said composition.
Claim 3
Dependent Claim
19 words
A composition, as defined in claim 1, containing about 1 % benzoin based on the weight of the polystyrene.
Claim 4
Dependent Claim
30 words
A composition of atactic polystyrene blended with containing from about 0.01 to about 5% of benzoin, based on the weight of the polystyrene, sufficient to accelerate photodegradation of the polystyrene.
Claim 5
Dependent Claim
30 words
A composition of atactic polystyrene blended with containing from about 0.01 to about 5% of benzoin, based on the weight of the polystyrene, sufficient to accelerate photodegradation of the polystyrene.
Claim 6
Dependent Claim
13 words
A composition, as defined in claim 3 wherein the polystyrene is polystyrene foam.
Claim 7
Dependent Claim
54 words
A composition, as defined in claim 3, which in addition contains a stearate of cobalt or manganese in amount providing from about 0.0001 to about 5% of the metal component of said stearate, based on the weight of the polystyrene, sufficient in combination with the benzoin to synergistically accelerate the photodegradation of the polystyrene.
Claim 8
Dependent Claim
23 words
A composition, as defined in claim 5 that contains, based on the weight of the polystyrene, one percent of cobalt or manganese stearate.
Claim 9
Dependent Claim
14 words
A composition, as defined in claim 6, in which the polystyrene is polystyrene foam.
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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |