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US4231919A
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Suspension polymerization of styrene monomers in the presence of carbon black
Assignee: Eastman Kodak Co
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Filing: 1979-02-26
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Granted: 1980-11-04
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Expires: 1999-02-26
Abstract
Abstract A suspension polymerization process for polymerizing a styrene-containing monomer composition in the presence of untreated carbon black to produce a polymer comprising more than 40 weight percent of styrene moiety is described. The monomer composition comprises at least one styrene monomer having a substituent with a Hammett sigma value more positive than about 0.06.
Inventors
- 👤 Henry V. Isaacson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:17
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
63 words
A suspension polymerization process for polymerizing in the presence of untreated carbon black containing absorbed oxygen a polymer comprising more than 40 weight percent styrene moiety which comprises suspending in a continuous liquid phase for polymerization a dispersion comprising monomer, initiator and said carbon black, said monomer comprising styrene moiety having a substituent with a Hammett sigma value more positive than about 0.06.
Claim 2
Dependent Claim
63 words
A suspension polymerization process for polymerizing in the presence of untreated carbon black containing absorbed oxygen a polymer comprising more than 40 weight percent styrene moiety which comprises suspending in a continuous liquid phase for polymerization a dispersion comprising monomer, initiator and said carbon black, said monomer comprising styrene moiety having a substituent with a Hammett sigma value more positive than about 0.06.
Claim 3
Dependent Claim
25 words
A suspension polymerization process as described in claim 1 wherein said substituent is selected from the group consisting of chloro, cyano, nitro, m-fluoro, and m-methoxy.
Claim 4
Dependent Claim
23 words
A suspension polymerization process as described in claim 1 wherein said dispersion is suspended in an aqueous phase containing an amine oxide surfactant.
Claim 5
Dependent Claim
43 words
A suspension polymerization process as described in claim 1 wherein said monomer comprises styrene moiety in which at least about 5 percent by weight of said styrene moiety is styrene moiety having a substituent with a Hammett sigma value more positive than 0.06.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |