US4230836A
Expired / Lapsed
US
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Chemically cross-linked poly(p-methylstyrene)
Assignee: Mobil Oil AS
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Filing: 1979-04-26
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Granted: 1980-10-28
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Expires: 1999-04-26
Abstract
Abstract Polymers of p-methyl styrene can be cross-linked with chemical cross-linking agents, such as peroxides, to produce insoluble products. The methyl styrene used has a high content of the para-isomer. An important end use is for rigid food or beverage containers subjected to thermal conditions.
Inventors
- 👤 Peter J. Canterino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:42
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
45 words
A chemically cross-linked polymer of methyl ethenyl benzene derived from a polymerizable mixture of isomers of methyl ethenyl benzene consisting essentially of less than 10 percent by weight 1-methyl-3-ethenyl benzene, at least 90 percent by weight 1-methyl-4-ethenyl benzene, and 0 to 0.1 percent 1-methyl-2-ethenyl benzene.
Claim 2
Dependent Claim
45 words
A chemically cross-linked polymer of methyl ethenyl benzene derived from a polymerizable mixture of isomers of methyl ethenyl benzene consisting essentially of less than 10 percent by weight 1-methyl-3-ethenyl benzene, at least 90 percent by weight 1-methyl-4-ethenyl benzene, and 0 to 0.1 percent 1-methyl-2-ethenyl benzene.
Claim 3
Dependent Claim
36 words
The polymer of claim 1 in which the isomers are present in the mixture in the following proportions by weight: 1-methyl-2-ethenyl benzene: 0 to 0.05%, 1-methyl-3-ethenyl benzene: 1 to 5%, and 1-methyl-4-ethenyl benzene at least 95%.
Claim 4
Dependent Claim
38 words
The polymer of claim 1 in which the isomers are present in the mixture in the following proportions by weight: 1-methyl-2-ethenyl benzene: 0 to 0.05%, 1-methyl-3-ethenyl benzene: 1 to 3%, and 1-methyl-4-ethenyl benzene at least 97 to 99%.
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) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |