Patent US4255531A successfully refreshed from Google Patents.
US4255531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends with poly(p-methylstyrene)
Assignee: Mobil Oil AS
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Filing: 1979-12-10
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Granted: 1981-03-10
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Expires: 1999-12-10
Abstract
Abstract There is provided a blend of poly(p-methylstyrene) with small amounts of poly (C2-C4) olefin, olefin copolymer or SBR. The blend can be formed into shaped articles, such as food containers, which can be crosslinked by irradiation at low doses. Such articles are resistant to microwave oven conditions.
Inventors
- 👤 Harold A. Arbit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:58
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/16; C08L23/00; C08L23/02; C08L9/00; C08L9/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
30 words
A blend of poly(p-methylstyrene) with between about 0.1 weight percent and about 10 weight percent low molecular weight poly (C 2 -C 4 ) monoolefin, monoolefin copolymer, or styrene-butadiene rubber
Claim 2
Dependent Claim
30 words
A blend of poly(p-methylstyrene) with between about 0.1 weight percent and about 10 weight percent low molecular weight poly (C 2 -C 4 ) monoolefin, monoolefin copolymer, or styrene-butadiene rubber
Claim 3
Dependent Claim
30 words
The blend of claim 1 containing between about 0.5 weight percent and about 5 weight percent of said poly (C 2 -C 4 ) monolefin, monoolefin copolymer, or styrene-butadiene rubber
Claim 4
Dependent Claim
23 words
The blend of claim 2, wherein said poly (C 2 -C 4 ) monoolefin is polyethylene having a molecular weight of about 5,000-6,000.
Claim 5
Dependent Claim
23 words
The blend of claim 2, wherein said poly (C 2 -C 4 ) monoolefin is polyethylene having a molecular weight of about 18,000.
Claim 6
Dependent Claim
18 words
The blend of claim 2, containing between about 0.5 weight percent and about 5 weight percent styrene-butadiene rubber.
Claim 7
Dependent Claim
16 words
The blend of claim 2, wherein said poly (C 2 -C 4 ) olefin is polypropylene.
Claim 8
Dependent Claim
13 words
The blend of claim 2, wherein said monoolefin copolymer is ethylene propylene rubber.
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) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |