US4601967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner particles having a relatively high specific volume resistivity coating layer
Assignee: Ricoh Co Ltd
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Filing: 1984-12-06
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Granted: 1986-07-22
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Expires: 2004-12-06
Abstract
Abstract A toner for developing latent electrostatic images is disclosed, which consists of toner particles, with each toner particle consisting of (i) a core particle comprising an electroconductive material and/or magnetic powder and a binder agent, having a specific volume resistivity ranging from 10 2 ohm-cm to 10 9 ohm-cm and (ii) a coating layer comprising a coloring agent such as carbon black, or magnetic powder and a binder agent, having a specific volume resistivity of 10 9 ohm-cm or more.
Inventors
- 👤 Akira Suzuki
- 👤 Kazuo Kobayashi
- 👤 Sigekazu Enoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:27
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/093; G03G9/0935; G03G9/09357; G03G9/09307; G03G9/09314
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
91 words
A toner for developing latent electrostatic images comprising toner particles, each toner particle comprising a core particle having a specific volume resistivity ranging from 10 2 ohm-cm to 10 9 ohm-cm and a coating layer with which the surface of said core particle is coated, having a specific volume resistivity of 10 9 ohm-cm or more, said core particle comprising an electroconductive material and a binder agent, and said coating layer comprising a binder agent and a component selected from the group consisting of a magnetic material and a coloring agent.
Claim 2
Dependent Claim
91 words
A toner for developing latent electrostatic images comprising toner particles, each toner particle comprising a core particle having a specific volume resistivity ranging from 10 2 ohm-cm to 10 9 ohm-cm and a coating layer with which the surface of said core particle is coated, having a specific volume resistivity of 10 9 ohm-cm or more, said core particle comprising an electroconductive material and a binder agent, and said coating layer comprising a binder agent and a component selected from the group consisting of a magnetic material and a coloring agent.
Claim 3
Dependent Claim
16 words
A toner as claimed in claim 1, wherein said core particle further comprises a magnetic material.
Claim 4
Dependent Claim
23 words
A toner for developing latent electrostatic images as claimed in claim 1, wherein said core particle further comprises a center core particle therein.
Claim 5
Dependent Claim
23 words
A toner for developing latent electrostatic images as claimed in claim 2, wherein said core particle further comprises a center core particle therein.
Claim 6
Dependent Claim
111 words
A toner for developing latent electrostatic images as claimed in claim 2, wherein the amount of said magnetic material in said core particle is in the range of from 40 parts by weight to 100 parts by weight and the amount of said electroconductive material is in the range of from 5 parts by weight to 80 parts by weight to 100 parts by weight of said binder agent in said core particle, and the amount of said magnetic powder in said coating layer is in the range of 1 parts by weight to 30 parts by weight to 100 parts by weight of said binder agent in said coating layer.
Claim 7
Dependent Claim
77 words
A toner for developing latent electrostatic images as claimed in claim 1, wherein the amount of said electroconductive material is in the range of from 5 parts by weight to 100 parts by weight of said binder agent in said core particle, and the amount of said coloring agent is in the range of from 1 part by weight to 30 parts by weight to 100 parts by weight of said binder agent in said coating layer.
Claim 8
Dependent Claim
39 words
A toner for developing latent electrostatic images as claimed in claim 1, wherein said core particle has a mean diameter ranging from 1 μm to 50 μm, and said coating layer has a thickness of 5 μm or less.
Claim 9
Dependent Claim
39 words
A toner for developing latent electrostatic images as claimed in claim 2, wherein said core particle has a mean diameter ranging from 1 μm to 50 μm, and said coating layer has a thickness of 5 μm or less.
Claim 10
Dependent Claim
30 words
A toner for developing latent electrostatic images as claimed in claim 3, wherein said center core particles has a diameter in the range of from 1 μm to 20 μm.
Claim 11
Dependent Claim
30 words
A toner for developing latent electrostatic images as claimed in claim 4, wherein said center core particles has a diameter in the range of from 1 μm to 20 μm.
Claim 12
Dependent Claim
48 words
A toner for developing latent electrostatic images as claimed in claim 1, wherein said magnetic powder in said coating and said magnetic powder in said core each are selected from the group consising of iron, nickel, cobalt, manganese, and alloys and oxides of iron, nickel, cobalt and manganese.
Claim 13
Dependent Claim
45 words
A toner for developing latent electrostatic images as claimed in claim 1, wherein said electroconductive material employed in said core particle is selected from the group consisting of electroconductive carbon black, iron, nickel, cobalt, manganese, and alloys and oxides of iron, nickel, cobalt and manganese.
Claim 14
Dependent Claim
54 words
A toner for developing latent electrostatic images as claimed in claim 1, wherein said binder agent in said core and said binder agent in said coating each are selected from the group consisting of styrene-type resin, acrylic resin, vinyl-type resin, epoxy resin, polyester resin, phenol resin, polyurethane resin, natural resins, cellulose and cellulose derivatives.
Claim 15
Dependent Claim
45 words
A toner for developing latent electrostatic images as claimed in claim 1, wherein said electroconductive material employed in said core particle is selected from the group consisting of electoconductive carbon black, iron, nickel, cobalt, manganese, and alloys and oxides of iron, nickel, cobalt and manganese.
Claim 16
Dependent Claim
54 words
A toner for developing latent electrostatic images as claimed in claim 2, wherein said binder agent in said core and said binder agent in said coating each are selected from the group consisting of styrene-type resin, acrylic resin, vinyl-type resin, epoxy resin, polyester resin, phenol resin, polyurethane resin, natural resins, cellulose and cellulose derivatives.
Claim 17
Dependent Claim
39 words
A toner for developing latent electrostatic images as claimed in claim 1, wherein said coloring agent is selected from the group consisting of carbon black, aniline black, Crystal Violet, Rhodamine B, Malachite Green, Nigrosine, copper phthalocyanine and azo dyes.
Claim 18
Dependent Claim
43 words
A toner for developing latent electrostatic images as claimed in claim 2, wherein said core particle further comprises a coloring agent selected from the group consisting of carbon black, aniline black, Crystal Violet, Rhodamine B, Malachite Green, Nigrosine, copper phthalocyanine and azo dyes.
Claim 19
Dependent Claim
52 words
A toner for, developing latent electrostatic images as claimed in claim 1, wherein said coating layer further comprises a polarity control agent selected from the group consisting of Nigrosine, mono-azo dyes, zinc hexadecyl succinate, alkyl esters and alkylamines of naphthoic acid, nitrohumic acid, N,N'-tetramethyldiamine benzophenone, N,N'-tetramethyl-benzidine, triazine and salicylic acid metal complexes.
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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) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |