US4859560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner for use in electrophotography
Assignee: Sharp Corp
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Filing: 1987-10-09
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Granted: 1989-08-22
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Expires: 2007-10-09
Abstract
Abstract A method of producing toner particles for use in electrophotography where the particles have a colored resin core particle containing a resin and a colorant and charge controlling layer on the particle's outer surface. The charge controlling layer contains a charge controlling agent but not any colorant. The method comprises the steps of: (1) preparting toner core particles by mixing, kneading, crushing and sorting a first material including a resin material and a colorant, (2) preparing charge controlling particles with smaller diameters than the toner core particles by mixing, kneading, crushing and sorting a second material including a charge controlling agent, and (3) thereafter mixing the toner core particles the said charge controlling particles and causing a charge controlling layers to be formed around the toner core particles by applying a pressure to the mixed particles.
Inventors
- 👤 Tadashi Nakamura
- 👤 Yaosuo Kitabatake
- 👤 Yoshiaki Takahashi
- 👤 Kazuya Maeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:10
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0802; G03G9/081; G03G9/0808; G03G9/0825; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
136 words
A method of producing toner particles for use in electrophotography with particles having a colored resin core containing resin and a colorant and a charge controlling layer on the outer surface of said colored resin core, said charge controlling layer containing a charge controlling agent but not containing any colorant, said method comprising the steps of preparing toner core particles by mixing, kneading, crushing and sorting a first material including a resin material and a colorant, preparing charge controlling particles with smaller diameters than said toner core particles by mixing, kneading, crushing and sorting a second material including a charge controlling agent, and thereafter mixing said toner core particles with said charge controlling particles and causing a charge controlling layer to be formed around said toner core particles by applying a pressure to said mixed particles.
Claim 2
Independent Claim
136 words
A method of producing toner particles for use in electrophotography with particles having a colored resin core containing resin and a colorant and a charge controlling layer on the outer surface of said colored resin core, said charge controlling layer containing a charge controlling agent but not containing any colorant, said method comprising the steps of preparing toner core particles by mixing, kneading, crushing and sorting a first material including a resin material and a colorant, preparing charge controlling particles with smaller diameters than said toner core particles by mixing, kneading, crushing and sorting a second material including a charge controlling agent, and thereafter mixing said toner core particles with said charge controlling particles and causing a charge controlling layer to be formed around said toner core particles by applying a pressure to said mixed particles.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein said toner particles are about 10 μm in size.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein said colored resin member is about 8 μ m in diameter.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein said first material includes styrene-acryl copolymer, polystyrene and polypropylene.
Claim 6
Dependent Claim
17 words
The method of claim 1 wherein said second material includes styrene-acryl copolymer, polypropylene and quaternary amonium salt.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein said second material further includes a resin.
Claim 8
Dependent Claim
13 words
The method of claim 6 wherein said second material further includes a colorant.
Claim 9
Dependent Claim
19 words
The method of claim 1 wherein said pressure is weak enough not to crush said mixed toner core particles.
References Cited (Backward Citations)
US4288519A
Cited
JPS54101328A
Cited
US4314017A
Cited
US4265994A
Cited
US4221456A
Cited
US4599289A
Cited
US4520091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |