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Patent US5244768A successfully refreshed from Google Patents.
US5244768A
Expired / Lapsed
US
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Manufacturing process for an electrophotographic toner
Assignee: Fujifilm Business Innovation Corp
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Filing: 1992-02-14
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Granted: 1993-09-14
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Expires: 2012-02-14
Abstract
Abstract A process for manufacturing an electrophotographic toner is disclosed, comprising preparing a toner dispersion, adding a monomer and polymerizing without an emulsifier or with an emulsifier concentration less than the critical micell concentration. The toner has triboelectrification controlling properties on its surface, not influenced by the triboelectrification properties of coloring material when used in the toner, and without adhesive coagulation of the toner particles. It has excellent triboelectrification stability against environmental change and produces a good image free of fog.
Inventors
- 👤 Yoshihiro Inaba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:12
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0802; G03G9/0804; G03G9/0806
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
66 words
A process for manufacturing an electrophotographic toner comprising the steps of: preparing a dispersion containing water and toner particles having a resin and a colorant dispersed in said water; adding a monomer to said dispersion to obtain a mixture of said monomer and said dispersion; polymerizing said mixture without an emulsifying agent or an emulsifying agent present in an amount less than the critical micell concentration.
Claim 2
Dependent Claim
66 words
A process for manufacturing an electrophotographic toner comprising the steps of: preparing a dispersion containing water and toner particles having a resin and a colorant dispersed in said water; adding a monomer to said dispersion to obtain a mixture of said monomer and said dispersion; polymerizing said mixture without an emulsifying agent or an emulsifying agent present in an amount less than the critical micell concentration.
Claim 3
Dependent Claim
40 words
The process of claim 1 wherein said monomer is a (meth)acrylate ester, aliphatic vinyl ester, aromatic vinyl compound, (meth)acrylic ester type ammonium salt, (meth)acrylic amide, vinyl benzyl ammonium salt, vinyl pyridinium salt, or a vinyl monomer having a quaternary nitrogen.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein said monomer is a (meth)acrylic acid.
Claim 5
Dependent Claim
12 words
The process of claim 2 wherein said monomer is a (meth)acrylate ester.
Claim 6
Dependent Claim
15 words
The process of claim 2 wherein said monomer is a (meth)acrylic ester type ammonium salt.
Claim 7
Dependent Claim
12 words
The process of claim 2 wherein said monomer is a (meth)acrylic amide.
Claim 8
Dependent Claim
19 words
The process of claim 2 wherein said polymerization is conducted in the presence of a water soluble redox catalyst.
Claim 9
Dependent Claim
36 words
The process of claim 2 wherein said toner particle is formed by a dry process comprising mixing, kneading or pulverizing a polymer, said polymer optionally being in combination with a magnetic powder or a coloring material.
Claim 10
Dependent Claim
47 words
The process of claim 2 wherein said toner particle is formed by a wet process comprising spray drying a polymer solution, forming a polymer by suspension polymerization or forming a polymer by seed polymerization, said polymer optionally being in combination with a magnetic power or coloring material.
Claim 11
Dependent Claim
11 words
The process of claim 2 wherein said toner is a capsule.
Claim 12
Dependent Claim
18 words
The process of claim 10 wherein said toner particle is a capsule which can be fixed by pressure.
Claim 13
Dependent Claim
20 words
The process of claim 10 wherein said toner particle is a capsule which can be fixed by heat and pressure.
Claim 14
Dependent Claim
29 words
The process of claim 2 wherein the emulsifying agent when employed is a water soluble cellulose derivative, a polyvinyl alcohol, gelatin, starch, gum arabic or an interfacial active agent.
Claim 15
Dependent Claim
17 words
The process of claim 13 wherein said emulsifying agent when employed is a water soluble cellulose derivative.
Claim 16
Dependent Claim
15 words
The process of claim 13 wherein said emulsifying agent when employed is a polyvinyl alcohol.
Claim 17
Dependent Claim
16 words
The process of claim 13 wherein said emulsifying agent when employed is an interfacial active agent.
Claim 18
Dependent Claim
9 words
The product produced by the process of claim 1.
Claim 19
Dependent Claim
9 words
The product produced by the process of claim 2.
Claim 20
Dependent Claim
9 words
The product produced by the process of claim 8.
Claim 21
Dependent Claim
9 words
The product produced by the process of claim 10.
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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) | 1996-09-13 | 1997-03-15 | 1997-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-13 | 2001-03-15 | 2001-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-13 | 2005-03-15 | 2005-09-14 | $7700.00 | Window Closed / Lapsed |