EP0704767A1
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EP
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A two-component type developer
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1995-08-11
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Granted: —
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Expires: 2015-08-11
Abstract
Abstract The invention provides a two-component type developer including toner and a carrier. The toner particles in the toner includes a binder resin and magnetic powder dispersed in the binder resin. The binder resin is made of a composition including a resin having an anionic group. The magnetic powder is included in the toner particles at a proportion of 0.1 through 5 parts by weight per 100 parts by weight of the binder resin. Each of the carrier particles in the carrier has a core particle and a coating layer covering the core particle, and the core particle is made of a magnetic material represented by the following Formula (A): Formula (A) MOFe₂O₃ wherein M indicates at least one metal selected from the group consisting of Cu, Zn, Fe, Ba, Ni, Mg, Mn, Al and Co.
Inventors
- 👤 Masatomi C/O Mita Industrial Co. Ltd. Funato
- 👤 Seijiro C/O Mita Industrial Co. Ltd. Ishimaru
- 👤 Yoshitake C/O Mita Industrial Co. Ltd. Shimizu
- 👤 Norio C/O Mita Industrial Co. Ltd. Kubo
- 👤 Kazuya Nagao
- 👤 Mamoru Kato
- 👤 Terumichi Asano
- 👤 Tomohide Iida
- 👤 Hideaki Kawata
- 👤 Nobuaki Kawano
- 👤 Yoshiteru Hatase
- 👤 Hidekazu Tamura
- 👤 Kazuhiko Fujii
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 21:08
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/10; G03G9/113; G03G9/1132; G03G9/1135; G03G9/1136; G03G9/107; G03G9/108; G03G9/1085; G03G9/083; G03G9/08784; G03G9/08791; G03G9/1075; G03G9/1133; G03G9/1137
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
133 words
A two-component type developer comprising toner and a carrier, wherein said toner includes toner particles, said toner particles include a binder resin and magnetic powder dispersed in said binder resin, said binder resin is made of a composition including a resin having an anionic group, said magnetic powder is included in said toner particles in the range of 0.1 to 5 parts by weight per 100 parts by weight of said binder resin, each carrier particle in said carrier has a core particle and a coating layer covering said core particle, and said core particle is made of a magnetic material represented by the following Formula (A): Formula (A): MOFe₂O₃ wherein M indicates at least one metal selected from the group consisting of Cu, Zn, Fe, Ba, Ni, Mg, Mn, Al and Co.
Claim 2
Dependent Claim
46 words
A two-component type developer according to claim 1, wherein an extracted solution obtained by extracting said toner with methanol has substantially no absorption peak in the range of 280 to 350 nm, and has a substantially zero absorbance in the range of 400 to 700 nm.
Claim 3
Dependent Claim
33 words
A two-component type developer according to claim 1, wherein said magnetic powder is contained in the range of 0.5 to 3 parts by weight per 100 parts by weight of said binder resin.
Claim 4
Dependent Claim
45 words
A two-component type developer according to claim 1, wherein said toner particles have a volume-based average particle diameter of 5 through 15 µm, and spacer particles having a volume-based average particle diameter of 0.05 through 1.0 µm are attached onto surfaces of said toner particles.
Claim 5
Dependent Claim
25 words
A two-component type developer according to claim 1, wherein said coating layer is made of a resin composition including a resin having a cationic group.
Claim 6
Dependent Claim
71 words
A two-component type developer according to claim 1, wherein said coating layer is made of a resin composition including an alkylated melamine resin and an acryl-modified silicone resin, and said alkylated melamine resin has a weight-average molecular weight M represented by the following Formula (B): Formula (B): M ≧ 1100C - 400 wherein C indicates the number of carbon atoms included in an alkyl group contained in said alkylated melamine resin.
Claim 7
Dependent Claim
42 words
A two-component type developer according to claim 1, wherein said coating layer is made of a resin composition including a methyl silicone resin and a methylated melamine resin, and said methylated melamine resin has a weight-average molecular weight of 700 or more.
Claim 8
Dependent Claim
35 words
A two-component type developer according to claim 1, wherein said coating layer is made of a resin composition including a methyl silicone resin containing a T unit at a proportion of 70 mol% or more.
Claim 9
Dependent Claim
49 words
A two-component type developer according to claim 1, wherein said coating layer is made of a resin composition including a thermosetting resin and a thermoplastic resin, said thermoplastic resin including a quaternary ammonium group at a concentration of 0.1 through 20 mmole per 100 g of said resin composition.
Claim 10
Dependent Claim
25 words
A two-component type developer according to claim 1, wherein said coating layer includes a thermosetting resin and has a curing degree of 85% or more.
Claim 11
Dependent Claim
31 words
A two-component type developer according to claim 1, wherein said coating layer has a content of 0.001 through 2.5 parts by weight per 100 parts by weight of said core particle.
Claim 12
Dependent Claim
57 words
A two-component type developer according to any of claims 9 and 10, wherein said thermosetting resin is at least one selected from the group consisting of a modified or unmodified silicone resin, a thermosetting acrylic resin, a thermosetting styrene-acrylic resin, a phenol resin, a urethane resin, a thermosetting polyester resin, an epoxy resin and an amino resin.
Claim 13
Dependent Claim
24 words
A two-component type developer according to claim 5, wherein said resin having a cationic group is a resin having a basic nitrogen containing group.
Claim 14
Dependent Claim
21 words
A two-component type developer according to claim 1, wherein said core particle has a particle diameter of 50 through 150 µm.
References Cited (Backward Citations)
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