US4281083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends of poly(p-methylstyrene) with polyfunctional monomer
Assignee: Mobil Oil AS
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Filing: 1980-08-01
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Granted: 1981-07-28
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Expires: 2000-08-01
Abstract
Abstract There is provided a blend of poly(p-methylstyrene) with a small amount of a polyfunctional monomer, such as trimethylolpropane trimethacrylate. The blend can be formed into shaped articles, such as food containers, which can be crosslinked by irradiation at low doses. Such irradiated articles are resistant to microwave oven conditions.
Inventors
- 👤 Harold A. Arbit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:00
CPC Classifications
C; C08; C08F; C08F257/00; C08F257/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
28 words
A blend consisting essentially of poly(methylstyrene) containing at least 90 weight percent poly(p-methylstyrene) with between about 0.1 weight percent and about 10 weight percent of a polyfunctional monomer.
Claim 2
Dependent Claim
28 words
A blend consisting essentially of poly(methylstyrene) containing at least 90 weight percent poly(p-methylstyrene) with between about 0.1 weight percent and about 10 weight percent of a polyfunctional monomer.
Claim 3
Dependent Claim
19 words
The blend of claim 1 containing between about 0.5 weight percent and about 5 weight percent of said monomer.
Claim 4
Dependent Claim
11 words
The blend of claim 2, wherein said monomer is trimethylolpropane trimethacrylate.
Claim 5
Dependent Claim
10 words
The blend of claim 2, wherein said monomer is divinylbenzene.
Claim 6
Dependent Claim
29 words
A blend as defined in claims 1, 2, 3, or 4, wherein said poly(methylstyrene) contains 3 percent meta isomer and 0.1 percent ortho isomer, the balance being para isomer.
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) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |