Magnetic carrier and two-component developer
First Claim
1. A magnetic carrier comprising:
- a magnetic substance-dispersed resin carrier core, which contains a magnetic substance and a binding resin, anda coating resin on a surface thereof,wherein;
the magnetic substance-dispersed resin carrier core has a resistivity Rk at 1000 V/cm of 5.0×
106 Ω
·
cm or more and 8.0×
107 Ω
·
cm or less,the magnetic substancei) has a number average particle diameter of 0.20 μ
m or more and 0.35 μ
m or less, andii) comprises magnetic-substance particles having a shape with vertexes and having a particle diameter of 0.53 μ
m or more in an amount of 10.0 vol % or more and 32.0 vol % or less based on a total amount of the magnetic substance;
and wherein;
when analyzing an element in the magnetic substance-dispersed resin carrier core by a fluorescent X-ray analysis and calculating the contents of Fe element and Zn element therein by fundamental parameter quantitative method,i) an Fe2O3 content is 98.00% by mass or more, andii) a ZnO content is 0.06% by mass or more and 0.50% by mass or less,with respect to the total amount by mass of all the detected elements provided that all the detected elements are in oxide form.
1 Assignment
0 Petitions
Accused Products
Abstract
Provided is a magnetic carrier excellent in leakage, uniformity of a solid image having satisfactory charging stability and developing performance at low electric field. The magnetic carrier is a magnetic carrier comprising: a magnetic substance-dispersed resin carrier core, which contains a magnetic substance and a binding resin, and a coating resin on a surface thereof, wherein: the carrier core has resistivity at 1000 V/cm of 5.0×106-8.0×107 Ω·cm, the magnetic substance has a number average particle diameter of 0.20-0.35 μm; and comprises magnetic-substance particles having vertexes and a particle diameter of 0.53 μm or more in an amount of 10.0-32.0 vol % based on a total amount of the magnetic substance; and wherein: the carrier core has Fe2O3 content of 98.00% by mass or more; and ZnO content of 0.06-0.50% by mass.
45 Citations
10 Claims
-
1. A magnetic carrier comprising:
-
a magnetic substance-dispersed resin carrier core, which contains a magnetic substance and a binding resin, and a coating resin on a surface thereof, wherein; the magnetic substance-dispersed resin carrier core has a resistivity Rk at 1000 V/cm of 5.0×
106 Ω
·
cm or more and 8.0×
107 Ω
·
cm or less,the magnetic substance i) has a number average particle diameter of 0.20 μ
m or more and 0.35 μ
m or less, andii) comprises magnetic-substance particles having a shape with vertexes and having a particle diameter of 0.53 μ
m or more in an amount of 10.0 vol % or more and 32.0 vol % or less based on a total amount of the magnetic substance;and wherein; when analyzing an element in the magnetic substance-dispersed resin carrier core by a fluorescent X-ray analysis and calculating the contents of Fe element and Zn element therein by fundamental parameter quantitative method, i) an Fe2O3 content is 98.00% by mass or more, and ii) a ZnO content is 0.06% by mass or more and 0.50% by mass or less, with respect to the total amount by mass of all the detected elements provided that all the detected elements are in oxide form. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification