MAGNETIC CARRIER AND TWO-COMPONENT DEVELOPER
First Claim
1. A magnetic carrier which comprises magnetic carrier particles containing a porous magnetic core particles and a resin, whereinby 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°
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reflected electron image;
(a) the number “
A”
of straight lines along which the resin is in a thickness of from 0.0 μ
m or more to 0.3 μ
m or less as found by measuring the distance from the surface of the magnetic carrier particle to the surface of a porous magnetic core particle on the straight lines is from 7 lines or more to 36 lines or less, based on 72 lines in total number of the straight lines;
(b) the number “
B”
of straight lines along which the resin is in a thickness of from 1.5 am or more to 5.0 am or less as found by measuring the distance from the surface of the magnetic carrier particle to the surface of the porous magnetic core particle on the straight lines is from 7 lines or more to 36 lines or less, based on 72 lines in total number of the straight lines; and
(c) the number “
C”
of straight lines along which the resin is in a thickness of from 0.0 μ
m or more to 5.0 μ
m or less as found by measuring the distance from the surface of the magnetic carrier particle to the surface of the porous magnetic core particle on the straight lines is 70 lines or more, based on 72 lines in total number of the 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
8 Claims
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1. A magnetic carrier which comprises magnetic carrier particles containing a porous magnetic core particles and a resin, whereinby 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°
- ;
reflected electron image;(a) the number “
A”
of straight lines along which the resin is in a thickness of from 0.0 μ
m or more to 0.3 μ
m or less as found by measuring the distance from the surface of the magnetic carrier particle to the surface of a porous magnetic core particle on the straight lines is from 7 lines or more to 36 lines or less, based on 72 lines in total number of the straight lines;(b) the number “
B”
of straight lines along which the resin is in a thickness of from 1.5 am or more to 5.0 am or less as found by measuring the distance from the surface of the magnetic carrier particle to the surface of the porous magnetic core particle on the straight lines is from 7 lines or more to 36 lines or less, based on 72 lines in total number of the straight lines; and(c) the number “
C”
of straight lines along which the resin is in a thickness of from 0.0 μ
m or more to 5.0 μ
m or less as found by measuring the distance from the surface of the magnetic carrier particle to the surface of the porous magnetic core particle on the straight lines is 70 lines or more, based on 72 lines in total number of the straight lines. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification