US5059505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin particles
Assignee: Nippon Paint Co Ltd
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Filing: 1990-08-20
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Granted: 1991-10-22
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Expires: 2010-08-20
Abstract
Abstract Disclosed is a process for preparing polymer particles suitable for electrophotographic toner. The substantially spherical resin particles have a weight average particle size of 1 to 30 microns and contain a carbon atom as main component, a silicon atom in an amount of 1×10 -1 to 7% by weight and/or a fluorine atom in an amount of 1×10 -2 to 2% by weight. The particles are prepared by polymerizing a polymerizable monomer in an organic solvent having a higher solubility parameter (SP value) than the resultant polymer by at least 1.0 in the presence of a dispersion stabilizer which is soluble in said organic solvent and which has a dialkylsiloxane bond and/or a fluorine atom, and then removing said organic solvent.
Inventors
- 👤 Akio Kashihara
- 👤 Chikayuki Otsuka
- 👤 Naoya Yabuuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:47
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/04; C08F2/06; C08F2/08; G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08726; G03G9/08728; G03G9/08784; G03G9/08791; Y; Y10; Y10S; Y10S524/00; Y10S524/904; Y10S525/00; Y10S525/934
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
123 words
Resin particles substantially spherical in shape having a weight average particle size of 1 to 30 microns and containing a carbon atom as main component, a silicon atom in an amount of 1×10 -1 to 7% by weight and/or a fluorine atom in an amount of 1×10 --2 to 2% by weight; the particles being prepared by polymerizing a polymerizable monomer in an organic solvent having a higher solubility parameter than the resultant polymer by at least 1.0 in the presence of a dispersion stabilizer which is soluble in said organic solvent and which has a dialkylsiloxane bond and/or a fluorine atom, and then removing said organic solvent; wherein said resin particles have said dispersion stabilizer on the surface of said resin particles.
Claim 2
Dependent Claim
123 words
Resin particles substantially spherical in shape having a weight average particle size of 1 to 30 microns and containing a carbon atom as main component, a silicon atom in an amount of 1×10 -1 to 7% by weight and/or a fluorine atom in an amount of 1×10 --2 to 2% by weight; the particles being prepared by polymerizing a polymerizable monomer in an organic solvent having a higher solubility parameter than the resultant polymer by at least 1.0 in the presence of a dispersion stabilizer which is soluble in said organic solvent and which has a dialkylsiloxane bond and/or a fluorine atom, and then removing said organic solvent; wherein said resin particles have said dispersion stabilizer on the surface of said resin particles.
Claim 3
Dependent Claim
40 words
The particles according to claim 1 wherein said dispersion stabilizer contains 1 to 35% by weight of a silicon atom and is present in an amount of 1 to 20% by weight based on an amount of the polymerizable monomer.
Claim 4
Dependent Claim
41 words
The particles according to claim 1, wherein said dispersion stabilizer contains 1×10 -1 to 20% by weight of a fluorine atom and is present in an amount of 1 to 20% by weight based on an amount of the polymerizable monomer.
Claim 5
Dependent Claim
19 words
The particles according to claim 1 wherein the polymerization reaction is conducted in the presence of a coloring agent.
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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) | 1994-10-21 | 1995-04-22 | 1995-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-21 | 1999-04-22 | 1999-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-21 | 2003-04-22 | 2003-10-22 | $7700.00 | Window Closed / Lapsed |