Magnetic carrier and two-component developer
First Claim
1. A magnetic carrier which comprises:
- magnetic carrier particles containing porous magnetic core particles which are filled in pores thereof with a first resin;
wherein the porous magnetic carrier particles filled in pores thereof with the first resin are further coated on the surfaces thereof with a second resin, which is the same or different from the first resin; and
wherein 60% by number or more of the magnetic carrier particles satisfies the following (a), (b) and (c) when cross-sectional reflected electron image of the magnetic carrier particle photographed by a SEM is divided into 72 with straight lines drawn from a reference point in a radial fashion towards the surface of the magnetic carrier particle at an interval of 5°
;
(a) the number “
A”
of the straight lines on which the distance from the surface of the magnetic carrier particle to the surface of the porous magnetic core particle is from 0.0 μ
m or more to 0.3 μ
m or less, is from 7 lines or more to 36 lines or less, among the 72 straight lines;
(b) the number “
B”
of the straight lines on which the distance from the surface of the magnetic carrier particle to the surface of the porous magnetic core particle is from 1.5 μ
m or more to 5.0 μ
m or less, is from 7 lines or more to 36 lines or less, among the 72 straight lines; and
(c) the number “
C”
of the straight lines on which the distance from the surface of the magnetic carrier particle to the surface of the porous magnetic core particle is from 0.0 μ
m or more to 5.0 μ
m or less, is 70 lines or more, among the 72 straight lines.
1 Assignment
0 Petitions
Accused Products
Abstract
A magnetic carrier and a two-component developer are provided which have remedied blank areas, fog after leaving, carrier sticking during running, and image density variations before and after running. The magnetic carrier has magnetic carrier particles having at least porous magnetic core particles and a resin. The magnetic carrier particles satisfying the specific conditions (a), (b) and (c) where, in a reflected electron image of cross sections of the magnetic carrier particles as photographed with a scanning electron microscope, straight lines that divide a cross section of a magnetic carrier particle into 72 at intervals of 5° are drawn from a reference point of the cross section thereof toward the surface of the magnetic carrier particle; the magnetic carrier particles being contained in an amount of 60% by number or more.
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Citations
6 Claims
-
1. A magnetic carrier which comprises:
- magnetic carrier particles containing porous magnetic core particles which are filled in pores thereof with a first resin;
wherein the porous magnetic carrier particles filled in pores thereof with the first resin are further coated on the surfaces thereof with a second resin, which is the same or different from the first resin; and wherein 60% by number or more of the magnetic carrier particles satisfies the following (a), (b) and (c) when cross-sectional reflected electron image of the magnetic carrier particle photographed by a SEM is divided into 72 with straight lines drawn from a reference point in a radial fashion towards the surface of the magnetic carrier particle at an interval of 5°
;(a) the number “
A”
of the straight lines on which the distance from the surface of the magnetic carrier particle to the surface of the porous magnetic core particle is from 0.0 μ
m or more to 0.3 μ
m or less, is from 7 lines or more to 36 lines or less, among the 72 straight lines;(b) the number “
B”
of the straight lines on which the distance from the surface of the magnetic carrier particle to the surface of the porous magnetic core particle is from 1.5 μ
m or more to 5.0 μ
m or less, is from 7 lines or more to 36 lines or less, among the 72 straight lines; and(c) the number “
C”
of the straight lines on which the distance from the surface of the magnetic carrier particle to the surface of the porous magnetic core particle is from 0.0 μ
m or more to 5.0 μ
m or less, is 70 lines or more, among the 72 straight lines. - View Dependent Claims (2, 3, 4, 5, 6)
- magnetic carrier particles containing porous magnetic core particles which are filled in pores thereof with a first resin;
Specification