US4943507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner for developing electrostatic latent image and method for developing electrostatic latent image with the same
Assignee: Konica Minolta Inc
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Filing: 1989-01-23
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Granted: 1990-07-24
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Expires: 2009-01-23
Abstract
Abstract A method of developing an electrostatic latent image wherein an electrostatic latent image with a negative polarity is formed on an organic photoreceptor and developed with a toner bearing a positive electric charge. The toner used to develop the latent image includes a binder resin, a coloring agent, silica, zinc stearate, and at least one oxide selected from hydrophobic aluminum oxide and hydrophobic titanium oxide. This method of developing the electrostatic latent image produces an image having a higher maximum image density.
Inventors
- 👤 Jiro Takahashi
- 👤 Kenzi Tsuzita
- 👤 Hiroyuki Takagiwa
- 👤 Kunio Shigeta
- 👤 Hiroya Masaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:18
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09708; G03G9/09716
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
71 words
A method of developing an electrostatic latent image comprising; forming an electrostatic latent image with a negative polarity on an organic photoreceptor, and developing said electrostatic latent image with a toner bearing a positive electric charge, said toner comprising (a) a binder resin, (b) a coloring agent, (c) at least one oxide selected from the group consisting of hydrophobic aluminum oxide and hydrophobic titanium oxide, (d) silica, and (e) zinc stearate.
Claim 2
Independent Claim
71 words
A method of developing an electrostatic latent image comprising; forming an electrostatic latent image with a negative polarity on an organic photoreceptor, and developing said electrostatic latent image with a toner bearing a positive electric charge, said toner comprising (a) a binder resin, (b) a coloring agent, (c) at least one oxide selected from the group consisting of hydrophobic aluminum oxide and hydrophobic titanium oxide, (d) silica, and (e) zinc stearate.
Claim 3
Dependent Claim
36 words
The method of claim 1, wherein said aluminum oxide and said titanium oxide are rendered hydrophobic by treatment with a compound selected from the group consisting of alkyl halogenated silane, alkyl alkoxy silane and alkylated silazane.
Claim 4
Dependent Claim
25 words
The method of claim 2, wherein said alkyl halogenated silane is dialkyl-di-halogenated silane, tri-alkyl-halogenated silane or alkyl-tri-halogenated silane; and said alkylated silazane is hexa-alkyl disilazane.
Claim 5
Dependent Claim
12 words
The method of claim 3, wherein said alkyl halogenated silane is dimethyl-dichlorosilane.
Claim 6
Dependent Claim
19 words
The method of claim 1, wherein said oxide has an average particle size of 0.001 μm to 1 μm.
Claim 7
Dependent Claim
17 words
The method of claim 5, wherein said average particle size is from 0.001 μm to 1 μm.
Claim 8
Dependent Claim
17 words
The method of claim 1, wherein said oxide comprises 0.01% to 10% by weight of said toner.
Claim 9
Dependent Claim
17 words
The method of claim 7, wherein said oxide comprises 0.05% to 5% by weight of said toner.
Claim 10
Dependent Claim
12 words
The method of claim 1, wherein said silica is a colloidal silica.
Claim 11
Dependent Claim
13 words
The method of claim 9, wherein said silica is a hydrophobic colloidal silica.
Claim 12
Dependent Claim
17 words
The method of claim 9, wherein said silica comprises 0.01% to 5% by weight of said toner.
Claim 13
Dependent Claim
17 words
The method of claim 11, wherein said silica comprises 0.5% to 2% by weight of said toner.
Claim 14
Dependent Claim
18 words
The method of claim 1, wherein said zinc stearate comprises 0.01% to 2% by weight of said toner.
Claim 15
Independent Claim
98 words
A method of developing an electrostatic latent image comprising; forming an electrostatic latent image with a negative polarity on an organic photoreceptor, and developing said electrostatic latent image using a developer comprising magnetic carrier particles bearing a negative electric charge and consisting essentially of said magnetic particles and a fluorinated resin coated on said magnetic particles; and toner particles bearing a positive electric charge and containing (a) a binder resin, (b) a coloring agent, (c) at least one oxide selected from the group consisting of hydrophobic aluminum oxide and hydrophobic titanium oxide, (d) silica, and (e) zinc stearate.
Claim 16
Independent Claim
98 words
A method of developing an electrostatic latent image comprising; forming an electrostatic latent image with a negative polarity on an organic photoreceptor, and developing said electrostatic latent image using a developer comprising magnetic carrier particles bearing a negative electric charge and consisting essentially of said magnetic particles and a fluorinated resin coated on said magnetic particles; and toner particles bearing a positive electric charge and containing (a) a binder resin, (b) a coloring agent, (c) at least one oxide selected from the group consisting of hydrophobic aluminum oxide and hydrophobic titanium oxide, (d) silica, and (e) zinc stearate.
Claim 17
Dependent Claim
31 words
The method of claim 14, wherein said oxide is rendered hydrophobic by treatment with a compound selected from the group consisting of alkyl halogenated silane, alkyl alkoxy silane and alkylated silazane.
Claim 18
Dependent Claim
25 words
The method of claim 15, wherein said alkyl halogenated silane is dialkyl-di-halogenated silane, tri-alkyl-halogenated silane or alkyl-tri-halogenated silane; and said alkylated silazane is hexa-alkyl disilazane.
Claim 19
Dependent Claim
12 words
The method of claim 16, wherein said alkyl halogenated silane is dimethyl-dichlorosilane.
Claim 20
Dependent Claim
19 words
The method of claim 14, wherein said oxide has an average particle size of 0.00l μm to 1 μm.
Claim 21
Dependent Claim
16 words
The method of claim 18, wherein said average particle size is 0.001 μm to 1 μm.
Claim 22
Dependent Claim
17 words
The method of claim 14, wherein said oxide comprises 0.01% to 10% by weight of said toner.
Claim 23
Dependent Claim
17 words
The method of claim 20, wherein said oxide comprises 0.05% to 5% by weight of said toner.
Claim 24
Dependent Claim
12 words
The method of claim 14, wherein said silica is a colloidal silica.
Claim 25
Dependent Claim
13 words
The method of claim 22, wherein said silica is a hydrophobic colloidal silica.
Claim 26
Dependent Claim
17 words
The method of claim 22, wherein said silica comprises 0.01% to 5% by weight of said toner.
Claim 27
Dependent Claim
17 words
The method of claim 23, wherein said silica comprises 0.05% to 2% by weight of said toner.
Claim 28
Dependent Claim
18 words
The method of claim 14, wherein said zinc stearate comprises 0.01% to 2% by weight of said toner.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-07-23 | 1994-01-22 | 1994-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-23 | 1998-01-22 | 1998-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-23 | 2002-01-22 | 2002-07-24 | $7700.00 | Window Closed / Lapsed |