Carrier for electrophotography, two component type developer, and image forming method
First Claim
Patent Images
1. A carrier for electrophotography, comprising magnetic carrier particles formed of a magnetic ferrite component represented by Formula (I):
- (Fe2O3)x(MnO)y(A)z
Formula (I)wherein A represents a member selected from the group consisting of Na2O, K2O, CaO, SrO and a mixture of any of these; and
X, Y and Z each represent a molar fraction and satisfy the condition of;
0.3<
X<
0.8, 0.01<
Y<
0.5, 0<
Z<
0.69, X+Y+Z≦
1.
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Abstract
A carrier for electrophotography and a two component type developer using the carrier. The carrier is composed of magnetic particles of a magnetic ferrite component represented by Formula:
(Fe2O3)x(MnO)y(A)z.
An image forming method is also disclosed which uses the two component type developer.
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Citations
40 Claims
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1. A carrier for electrophotography, comprising magnetic carrier particles formed of a magnetic ferrite component represented by Formula (I):
-
(Fe2O3)x(MnO)y(A)z
Formula (I)wherein A represents a member selected from the group consisting of Na2O, K2O, CaO, SrO and a mixture of any of these; and
X, Y and Z each represent a molar fraction and satisfy the condition of;0.3<
X<
0.8, 0.01<
Y<
0.5, 0<
Z<
0.69, X+Y+Z≦
1.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
(Fe2O3)x(MnO)y(A)z
Formula (I)wherein A represents a member selected from the group consisting of Na2O, K2O, CaO, SrO and a mixture of any of these; and
X, Y and Z each represent a molar fraction and satisfy the condition of;0.3<
X<
0.8, 0.01<
Y<
0.5, X+Y<
1, Z=1−
X−
Y.
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3. The carrier according to claim 1, wherein said magnetic carrier particles contain Bi2O3 in an amount of from 0.01 mol % to 3 mol %.
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4. The carrier according to claim 2, wherein said magnetic carrier particles contain Bi2O3 in an amount of from 0.01 mol % to 3 mol %.
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5. The carrier according to claim 1, wherein said carrier has a weight average particle diameter of 50 μ
- m or smaller.
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6. The carrier according to claim 2, wherein said carrier has a weight average particle diameter of 50 μ
- m or smaller.
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7. The carrier according to claim 1, wherein said carrier comprises the magnetic carrier particles and resin coat layers that coat the surfaces of the magnetic carrier particles.
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8. The carrier according to claim 2, wherein said carrier comprises the magnetic carrier particles and resin coat layers that coat the surfaces of said magnetic carrier particles.
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9. The carrier according to claim 1, wherein said carrier has a saturation magnetization of from 20 Am2/kg to 70 Am2/kg.
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10. A two component type developer comprising a toner containing toner particles and a carrier comprising magnetic carrier particles, wherein;
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said magnetic carrier particles is formed of a magnetic ferrite component represented by the following Formula (I); (Fe2O3)x(MnO)y(A)z
Formula (I)wherein A represents a member selected from the group consisting of Na2O, K2O, CaO, SrO and a mixture of any of these; and
X, Y and Z each represent a molar fraction and satisfy the condition of;0.3<
X<
0.8, 0.01<
Y<
0.5, 0<
Z<
0.69, X+Y+Z≦
1. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 36, 37, 38, 39, 40)
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35. An image forming method comprising;
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rotationally transporting a two component type developer having a toner and a carrier, onto a developer carrying member; and
developing in a developing zone an electrostatic latent image held on an electrostatic latent image bearing member, using the toner of the two component type developer carried on the developer carrying member;
wherein;
said toner contains toner particles; and
said carrier comprises magnetic carrier particles formed of a magnetic ferrite component represented by the following Formula (I); (Fe2O3)x(MnO)y(A)z
Formula (I)wherein A represents a member selected from the group consisting of Na2O, K2O, CaO, SrO and a mixture of any of these; and
X, Y and Z each represent a molar fraction and satisfy the condition of;0.3<
X<
0.8, 0.01<
Y<
0.5, 0<
Z<
0.69, X+Y+Z≦
1.
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Specification