US4835082A
Expired / Lapsed
US
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Toner for electrophotography
Assignee: Artience Co Ltd
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Filing: 1987-03-02
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Granted: 1989-05-30
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Expires: 2007-03-02
Abstract
Abstract A toner for electrophotographs which is prepared by mixing thermoplastic resin core particles (A) having an average size of from 1 to 15 μm with a colorant (B) and without or together with at least one of additives in a finely particulate form while applying mechanical strain force to the whole under such conditions that the average size of the resulting toner particles is in the range of 1-20 μm whereby the colorant (B) and the other necessary fine particles are embedded substantially as primary particles in the resin core particles (A). A process for production of the toner is also disclosed.
Inventors
- 👤 Masumi Koishi
- 👤 Manabu Sawada
- 👤 Nobuyuki Igarashi
- 👤 Akira Arikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:34
CPC Classifications
G; G03; G03G; G03G5/00; G03G9/00; G03G9/08; G03G9/0802; G03G9/0804; G03G9/0819; G03G9/0825
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
109 words
A toner for electrophotographs which is prepared by mixing thermoplastic resin core particles (A) having an average size of from 1 to 15 μm with a colorant (B) while applying mechanical strain force, said mechanical strain force being effected using a mixer in which powers in a fluidized bed state are moved at a high speed along with an air flow in the range of several tens to several hundreds m/seconds, whereby the particles do not fuse and the average size of the resulting toner particles is in the range of 1-20 μm whereby the colorant (B) is embedded substantially as primary particles in the resin core particles (A).
Claim 2
Dependent Claim
109 words
A toner for electrophotographs which is prepared by mixing thermoplastic resin core particles (A) having an average size of from 1 to 15 μm with a colorant (B) while applying mechanical strain force, said mechanical strain force being effected using a mixer in which powers in a fluidized bed state are moved at a high speed along with an air flow in the range of several tens to several hundreds m/seconds, whereby the particles do not fuse and the average size of the resulting toner particles is in the range of 1-20 μm whereby the colorant (B) is embedded substantially as primary particles in the resin core particles (A).
Claim 3
Dependent Claim
13 words
A toner according to claim 1, wherein the colorant (B) is a pigment.
Claim 4
Dependent Claim
15 words
The toner according to claim 1 wherein the toner particles are of essentially round shape.
Claim 5
Dependent Claim
122 words
A toner for electrophotographs which is prepared by mixing thermoplastic resin core particles (A) having an average size of from 1 to 15 μm with a colorant (B) and at least one additive in a finely particulate form while applying mechanical strain force, said mechanical strain force being effected using a mixer in which powders in a fluidized bed state are moved at a high speed along with an air flow in the range of several tens to several hundreds m/seconds, whereby the particles do not fuse and the average size of the resulting toner particles is in the range of 1-20 μm whereby the colorant (B) and said additive are embedded substantially as primary particles in the resin core particles (A).
Claim 6
Dependent Claim
122 words
A toner for electrophotographs which is prepared by mixing thermoplastic resin core particles (A) having an average size of from 1 to 15 μm with a colorant (B) and at least one additive in a finely particulate form while applying mechanical strain force, said mechanical strain force being effected using a mixer in which powders in a fluidized bed state are moved at a high speed along with an air flow in the range of several tens to several hundreds m/seconds, whereby the particles do not fuse and the average size of the resulting toner particles is in the range of 1-20 μm whereby the colorant (B) and said additive are embedded substantially as primary particles in the resin core particles (A).
Claim 7
Dependent Claim
27 words
A toner according to claim 4, wherein said additive are a magnetic powder, lubricant, flowability-imparting agent, charge controlling agent, low molecular weight polyolefin and a mixture thereof.
Claim 8
Dependent Claim
15 words
The toner according to claim 4 wherein the toner particles are of essentially round shape.
Claim 9
Dependent Claim
117 words
The process for the production of a toner for electrophotographs which comprises mixing thermoplastic resin core particles (A) having an average size of form 1-15 μm with a colorant (B) while applying mechanical strain force to the materials (A) and (B), said mechanical strain force being effected using a mixer in which powders in a fluidized bed state are moved at a high speed along with an air flow in the range of several tens to several hundreds m/second, whereby the particles do not fuse and the average size of the resulting toner particles is in the range of 1-20 μm whereby the colorant (B) is embedded substantially as primary particles in the resin core particles (A).
Claim 10
Dependent Claim
117 words
The process for the production of a toner for electrophotographs which comprises mixing thermoplastic resin core particles (A) having an average size of form 1-15 μm with a colorant (B) while applying mechanical strain force to the materials (A) and (B), said mechanical strain force being effected using a mixer in which powders in a fluidized bed state are moved at a high speed along with an air flow in the range of several tens to several hundreds m/second, whereby the particles do not fuse and the average size of the resulting toner particles is in the range of 1-20 μm whereby the colorant (B) is embedded substantially as primary particles in the resin core particles (A).
Claim 11
Dependent Claim
13 words
A process according to claim 7, wherein the colorant (B) is a pigment.
Claim 12
Dependent Claim
71 words
The process according to claim 7 wherein the resin is a member selected for the group consisting of polystyrene; a polystyrene copolymer resin of styrene and an acrylic ester, methacrylic ester, acrylonitrile or maleic ester; a polyacrylic ester resin; a polymethacrylic ester resin; a polyester resin; a polyamide resin; a polyvinyl acetate resin; an epoxy resin; a phenolic resin; an hydrocarbon resin; a petroleum resin; a chlorinated paraffin; and mixtures thereof.
Claim 13
Dependent Claim
124 words
A process for the production of a toner for electrophotographs which comprises mixing thermoplastic resin core particles (A) having an average size of from 1 to 15 μm with a colorant (B) and a charge controlling agent while applying mechanical strain force to said materials (A) and (B), said mechanical strain force being effected using a mixer in which powders in a fluidized bed state are moved at a high speed along with an air flow in the range of several tens to several hundreds m/second, whereby the particles do not fuse and the average size of the resulting toner particles is in the range of 1-20 μm whereby the colorant (B) is embedded substantially as primary particles in the resin core particles (A).
Claim 14
Dependent Claim
124 words
A process for the production of a toner for electrophotographs which comprises mixing thermoplastic resin core particles (A) having an average size of from 1 to 15 μm with a colorant (B) and a charge controlling agent while applying mechanical strain force to said materials (A) and (B), said mechanical strain force being effected using a mixer in which powders in a fluidized bed state are moved at a high speed along with an air flow in the range of several tens to several hundreds m/second, whereby the particles do not fuse and the average size of the resulting toner particles is in the range of 1-20 μm whereby the colorant (B) is embedded substantially as primary particles in the resin core particles (A).
Claim 15
Dependent Claim
71 words
The process according to claim 10 wherein the resin is a member selected from the group consisting of polystyrene; a polystyrene copolymer resin of styrene and an acrylic ester, methacrylic ester, acrylonitrile or maleic ester; a polyacrylic ester resin; a polymethacrylic ester resin; a polyester resin; a polyamide resin; a polyvinyl acetate resin; an epoxy resin; a phenolic resin; an hydrocarbon resin; a petroleum resin; a chlorinated paraffin; and mixtures thereof.
Claim 16
Dependent Claim
17 words
The process according to claim 7 wherein cooling is applied during application of said mechanical strain force.
Claim 17
Dependent Claim
17 words
The process according to claim 10 wherein cooling is applied during application of said mechanical strain force.
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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) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |