US4849318A
Expired / Lapsed
US
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Processes for producing electrophotographic toner
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1987-10-30
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Granted: 1989-07-18
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Expires: 2007-10-30
Abstract
Abstract A process for producing an electrophotographic toner in one step by suspension polymerization of monomers capable of forming a fixing resin. In a first embodiment, the suspension polymerization is carried out in the presence of a specific suspension stabilizer and a radical polymerization initiator. In a second embodiment, the suspension polymerization is carried out while applying ultrasonic radiation of a fixed frequency. The process gives a toner having a uniform particle size distribution.
Inventors
- 👤 Noriaki Tsubota
- 👤 Toshiro Tokuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:36
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; C; C08; C08F; C08F2/00; C08F2/44; G03G9/0802; G03G9/0804; G03G9/0806; Y; Y10; Y10S; Y10S524/00; Y10S524/904; Y10S525/00; Y10S525/934; Y10S526/00; Y10S526/934
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
90 words
A process for producing an electrophotographic toner which comprises suspending at least one monomer capable of forming a fixing resin and a coloring agent in water and polymerizing the suspended monomer particles in the presence of a radical initiator to form colored toner particles, wherein said radical initiator has a solubility in water at 25° C. of not more than 0.05 g/100 cc and the suspension polymerization is carried out in the presence of a surface-active agent, as a suspension stabilizer, in a concentration lower than the critical micelle concentration.
Claim 2
Dependent Claim
90 words
A process for producing an electrophotographic toner which comprises suspending at least one monomer capable of forming a fixing resin and a coloring agent in water and polymerizing the suspended monomer particles in the presence of a radical initiator to form colored toner particles, wherein said radical initiator has a solubility in water at 25° C. of not more than 0.05 g/100 cc and the suspension polymerization is carried out in the presence of a surface-active agent, as a suspension stabilizer, in a concentration lower than the critical micelle concentration.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the surface-active agent is an anionic surface-active agent.
Claim 4
Dependent Claim
33 words
The process of claim 1 wherein the polymerization of the suspended particles of the monomer is carried out so that the resulting toner particles has a particle diameter of 1 to 30 μm.
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) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |