JP2019028299A5 - - Google Patents
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- JP2019028299A5 JP2019028299A5 JP2017148301A JP2017148301A JP2019028299A5 JP 2019028299 A5 JP2019028299 A5 JP 2019028299A5 JP 2017148301 A JP2017148301 A JP 2017148301A JP 2017148301 A JP2017148301 A JP 2017148301A JP 2019028299 A5 JP2019028299 A5 JP 2019028299A5
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- Prior art keywords
- straight line
- magnetic core
- resin
- line
- region
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- 239000000969 carrier Substances 0.000 claims description 23
- 239000011347 resin Substances 0.000 claims description 19
- 229920005989 resin Polymers 0.000 claims description 19
- 239000011148 porous material Substances 0.000 claims description 12
- 239000007771 core particle Substances 0.000 claims description 10
- 239000011247 coating layer Substances 0.000 claims description 2
- 238000000921 elemental analysis Methods 0.000 claims description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000006082 mold release agent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
Description
本発明者らは、多孔質磁性コアを使用し、下記に示すような断面の樹脂由来の組成と多孔質磁性コア由来の存在率を規定した磁性キャリアを使用することで、高湿環境下での放置後においても、画像濃度の安定性、細線再現性に優れた磁性キャリアが得られることを見出した。
すなわち、本発明は、多孔質磁性コアと、該多孔質磁性コアの空孔に存在する充填樹脂とを有する樹脂充填型磁性コア粒子、及び、
該樹脂充填型磁性コア粒子の表面に存在する樹脂被覆層、
を有する磁性キャリアであって、
該多孔質磁性コアの細孔径分布において、
０．１μｍ以上３．０μｍ以下の範囲における微分細孔容積が最大となるピーク細孔径が、０．２０μｍ以上０．７０μｍ以下であり、
０．１μｍ以上３．０μｍ以下の範囲における微分細孔容積の積分値である細孔容積が、２０ｍｍ３／ｇ以上５７ｍｍ３／ｇ以下であり、
該磁性キャリアは、以下のように定義される領域Ｒ１及び領域Ｒ２における元素分析により求められる元素の存在比率に関し、
樹脂成分由来の組成の質量基準の割合をそれぞれＪＲ１及びＪＲ２とし、該多孔質磁性コア由来の組成の質量基準の割合をそれぞれＦＲ１及びＦＲ２とし、
さらにＪＲ１／ＦＲ１をＭＲ１、ＪＲ２／ＦＲ２をＭＲ２としたとき、
該ＭＲ１と該ＭＲ２とが、
０．２０≦ＭＲ２／ＭＲ１≦０．９０
の関係を満たすことを特徴とする磁性キャリア。
（領域Ｒ１は、該磁性キャリアの断面画像において、該樹脂充填型磁性コア粒子の最大長となる線分を引き、該線分と平行であり、該線分と２．５μｍ離れた２本の直線を直線Ａ及びＢとし、
該線分と該樹脂充填型磁性コア粒子の輪郭線との交点を通り、該線分と直交する直線を直線Ｃとし、
該直線Ｃと平行であり、磁性キャリアの中心方向に向けて該直線Ｃから５．０μｍ離れた直線を直線Ｄとしたときに、
該樹脂充填型磁性コア粒子の輪郭線と、該直線Ａ、Ｂ及びＤとに囲まれ、かつ該直線Ｃに接している領域である。
領域Ｒ２は、該直線Ａ、Ｂ、Ｄと、該直線Ｄと平行であり、磁性キャリアの中心方向に向けて該直線Ｄから５．０μｍ離れた直線Ｅとに囲まれた領域である。）
また、本発明は、結着樹脂、着色剤及び離型剤を含有するトナーと、磁性キャリアとを含有する二成分系現像剤であって、
該磁性キャリアが、上記磁性キャリアである二成分系現像剤に関する。
また、本発明は、静電潜像担持体を帯電する帯電工程、
該静電潜像担持体の表面に静電潜像を形成する静電潜像形成工程、
該静電潜像を二成分系現像剤を用いて現像し、トナー像を形成する現像工程、
該トナー像を中間転写体を介して又は介さずに、転写材に転写する転写工程、及び
転写された該トナー像を該転写材に定着する定着工程を有する画像形成方法であって、
該二成分系現像剤が、上記二成分系現像剤である画像形成方法に関する。
また、本発明は、現像器内の二成分系現像剤のトナー濃度の低下に応じて、補給用現像剤が該現像器に補給される画像形成方法であって、
該補給用現像剤が、磁性キャリアと、結着樹脂、着色剤及び離型剤を含有するトナーと、を含有し、
該補給用現像剤は、該磁性キャリア１質量部に対して該トナーを２質量部以上５０質量部以下含有し、
該磁性キャリアは、上記磁性キャリアである画像形成方法に関する。
また、本発明は、上記画像形成方法に使用するための補給用現像剤である。
The present inventors use a porous magnetic core, and by using a magnetic carrier that defines the composition derived from the resin in the cross section as shown below and the abundance derived from the porous magnetic core, in a high humidity environment. It was found that a magnetic carrier having excellent image density stability and fine line reproducibility can be obtained even after being left unattended.
That is, the present invention comprises resin-filled magnetic core particles having a porous magnetic core and a filling resin existing in the pores of the porous magnetic core, and
A resin coating layer existing on the surface of the resin-filled magnetic core particles,
It is a magnetic carrier with
In the pore size distribution of the porous magnetic core,
The peak pore diameter that maximizes the differential pore volume in the range of 0.1 μm or more and 3.0 μm or less is 0.20 μm or more and 0.70 μm or less.
The pore volume, which is the integral value of the differential pore volume in the range of 0.1 μm or more and 3.0 μm or less, is 20 mm 3 / g or more and 57 mm 3 / g or less.
Magnetic carrier relates abundance ratio of elements is determined by a defined elemental analysis definitive in region R1 and region R2 are as follows:
The mass-based proportions of the composition derived from the resin component were defined as JR1 and JR2, respectively, and the mass-based proportions of the composition derived from the porous magnetic core were defined as FR1 and FR2, respectively.
Furthermore, when JR1 / FR1 is MR1 and JR2 / FR2 is MR2,
The MR1 and the MR2
0.20 ≤ MR2 / MR1 ≤ 0.90
A magnetic carrier characterized by satisfying the relationship of.
(Region R1 is a cross-sectional image of the magnetic carrier, in which a line segment having the maximum length of the resin-filled magnetic core particles is drawn, and two lines are parallel to the line segment and 2.5 μm apart from the line segment. Let the straight lines be straight lines A and B
A straight line that passes through the intersection of the line segment and the contour line of the resin-filled magnetic core particles and is orthogonal to the line segment is defined as a straight line C.
When a straight line D parallel to the straight line C and 5.0 μm away from the straight line C toward the center of the magnetic carrier is defined as a straight line D.
It is a region surrounded by the contour line of the resin-filled magnetic core particles and the straight lines A, B and D, and in contact with the straight line C.
The region R2 is a region surrounded by the straight lines A, B, and D and a straight line E parallel to the straight line D and 5.0 μm away from the straight line D toward the center of the magnetic carrier. )
Further, the present invention is a two-component developer containing a toner containing a binder resin, a colorant and a mold release agent, and a magnetic carrier.
The magnetic carrier relates to a two-component developer which is the magnetic carrier.
Further, the present invention relates to a charging step of charging an electrostatic latent image carrier.
An electrostatic latent image forming step of forming an electrostatic latent image on the surface of the electrostatic latent image carrier,
A developing step of developing the electrostatic latent image with a two-component developer to form a toner image.
An image forming method comprising a transfer step of transferring the toner image to a transfer material with or without an intermediate transfer body, and a fixing step of fixing the transferred toner image to the transfer material.
The present invention relates to an image forming method in which the two-component developer is the above-mentioned two-component developer.
Further, the present invention is an image forming method in which a replenishing developer is replenished to the developing device according to a decrease in the toner concentration of the two-component developing agent in the developing device.
The replenishing developer contains a magnetic carrier and a toner containing a binder resin, a colorant and a mold release agent.
The replenishing developer contains 2 parts by mass or more and 50 parts by mass or less of the toner with respect to 1 part by mass of the magnetic carrier.
The magnetic carrier relates to an image forming method which is the magnetic carrier.
Further, the present invention is a replenishing developer for use in the above image forming method.
Claims (1)
該樹脂充填型磁性コア粒子の表面に存在する樹脂被覆層、
を有する磁性キャリアであって、
該多孔質磁性コアの細孔径分布において、
０．１μｍ以上３．０μｍ以下の範囲における微分細孔容積が最大となるピーク細孔径が、０．２０μｍ以上０．７０μｍ以下であり、
０．１μｍ以上３．０μｍ以下の範囲における微分細孔容積の積分値である細孔容積が、２０ｍｍ３／ｇ以上５７ｍｍ３／ｇ以下であり、
該磁性キャリアは、以下のように定義される領域Ｒ１及び領域Ｒ２における元素分析により求められる元素の存在比率に関し、
樹脂成分由来の組成の質量基準の割合をそれぞれＪＲ１及びＪＲ２とし、該多孔質磁性コア由来の組成の質量基準の割合をそれぞれＦＲ１及びＦＲ２とし、
さらにＪＲ１／ＦＲ１をＭＲ１、ＪＲ２／ＦＲ２をＭＲ２としたとき、
該ＭＲ１と該ＭＲ２とが、
０．２０≦ＭＲ２／ＭＲ１≦０．９０
の関係を満たすことを特徴とする磁性キャリア。
（領域Ｒ１は、該磁性キャリアの断面画像において、該樹脂充填型磁性コア粒子の最大長となる線分を引き、該線分と平行であり、該線分と２．５μｍ離れた２本の直線を直線Ａ及びＢとし、
該線分と該樹脂充填型磁性コア粒子の輪郭線との交点を通り、該線分と直交する直線を直線Ｃとし、
該直線Ｃと平行であり、磁性キャリアの中心方向に向けて該直線Ｃから５．０μｍ離れた直線を直線Ｄとしたときに、
該樹脂充填型磁性コア粒子の輪郭線と、該直線Ａ、Ｂ及びＤとに囲まれ、かつ該直線Ｃに接している領域である。
領域Ｒ２は、該直線Ａ、Ｂ、Ｄと、該直線Ｄと平行であり、磁性キャリアの中心方向に向けて該直線Ｄから５．０μｍ離れた直線Ｅとに囲まれた領域である。）
Resin-filled magnetic core particles having a porous magnetic core and a filling resin existing in the pores of the porous magnetic core, and
A resin coating layer existing on the surface of the resin-filled magnetic core particles,
It is a magnetic carrier with
In the pore size distribution of the porous magnetic core,
The peak pore diameter that maximizes the differential pore volume in the range of 0.1 μm or more and 3.0 μm or less is 0.20 μm or more and 0.70 μm or less.
The pore volume, which is the integral value of the differential pore volume in the range of 0.1 μm or more and 3.0 μm or less, is 20 mm 3 / g or more and 57 mm 3 / g or less.
Magnetic carrier relates abundance ratio of elements is determined by a defined elemental analysis definitive in region R1 and region R2 are as follows:
The mass-based proportions of the composition derived from the resin component were defined as JR1 and JR2, respectively, and the mass-based proportions of the composition derived from the porous magnetic core were defined as FR1 and FR2, respectively.
Furthermore, when JR1 / FR1 is MR1 and JR2 / FR2 is MR2,
The MR1 and the MR2
0.20 ≤ MR2 / MR1 ≤ 0.90
A magnetic carrier characterized by satisfying the relationship of.
(Region R1 is a cross-sectional image of the magnetic carrier, in which a line segment having the maximum length of the resin-filled magnetic core particles is drawn, and two lines are parallel to the line segment and 2.5 μm apart from the line segment. Let the straight lines be straight lines A and B
A straight line that passes through the intersection of the line segment and the contour line of the resin-filled magnetic core particles and is orthogonal to the line segment is defined as a straight line C.
When a straight line D parallel to the straight line C and 5.0 μm away from the straight line C toward the center of the magnetic carrier is defined as a straight line D.
It is a region surrounded by the contour line of the resin-filled magnetic core particles and the straight lines A, B and D, and in contact with the straight line C.
The region R2 is a region surrounded by the straight lines A, B, and D and a straight line E parallel to the straight line D and 5.0 μm away from the straight line D toward the center of the magnetic carrier. )
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017148301A JP6914773B2 (en) | 2017-07-31 | 2017-07-31 | Magnetic carrier, two-component developer, replenisher developer, and image forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017148301A JP6914773B2 (en) | 2017-07-31 | 2017-07-31 | Magnetic carrier, two-component developer, replenisher developer, and image forming method |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2019028299A JP2019028299A (en) | 2019-02-21 |
| JP2019028299A5 true JP2019028299A5 (en) | 2020-09-03 |
| JP6914773B2 JP6914773B2 (en) | 2021-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2017148301A Active JP6914773B2 (en) | 2017-07-31 | 2017-07-31 | Magnetic carrier, two-component developer, replenisher developer, and image forming method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6914773B2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9541853B2 (en) * | 2013-05-30 | 2017-01-10 | Canon Kabushiki Kaisha | Magnetic carrier, two-component developer, replenishing developer, and image forming method |
| EP2808738B1 (en) * | 2013-05-30 | 2019-03-27 | Canon Kabushiki Kaisha | Magnetic carrier, two-component developer, developer for replenishment, and image forming method |
| JP6320147B2 (en) * | 2013-05-30 | 2018-05-09 | キヤノン株式会社 | Magnetic carrier, two-component developer, replenishment developer, and image forming method |
| JP6632249B2 (en) * | 2014-08-26 | 2020-01-22 | キヤノン株式会社 | Magnetic carrier and two-component developer |
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