JP2005099072A5 - - Google Patents

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JP2005099072A5
JP2005099072A5 JP2003329350A JP2003329350A JP2005099072A5 JP 2005099072 A5 JP2005099072 A5 JP 2005099072A5 JP 2003329350 A JP2003329350 A JP 2003329350A JP 2003329350 A JP2003329350 A JP 2003329350A JP 2005099072 A5 JP2005099072 A5 JP 2005099072A5
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magnetic carrier
particles
magnetic
average particle
metal oxide
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JP2003329350A
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Japanese (ja)
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JP2005099072A (en
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Priority to JP2003329350A priority Critical patent/JP2005099072A/en
Priority claimed from JP2003329350A external-priority patent/JP2005099072A/en
Publication of JP2005099072A publication Critical patent/JP2005099072A/en
Publication of JP2005099072A5 publication Critical patent/JP2005099072A5/ja
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Claims (10)

バインダー樹脂及び磁性金属酸化物粒子を少なくとも含有する磁性キャリア粒子において、
磁性キャリア粒子の個数平均粒径Ｄｎが５〜２５μｍであり、
磁性キャリア粒子の比抵抗が２５Ｖ〜５００Ｖ印加時に５．０×１０１３Ωｃｍ以上であり、
磁性キャリア粒子の真比重が３．０〜４．９ｇ／ｃｍ３であり、
磁性キャリア粒子の１キロエルステッドにおける磁化の強さが１００〜３００ｅｍｕ／ｃｍ３であり、
磁性キャリア粒子表面の溶出鉄元素濃度に対するＦｅ（ＩＩ）含有量が０．００１〜５．０重量％であり、
磁性キャリアは下記式を満足することを特徴とする磁性キャリア。
−６．２５Ｒ＋３０７≦Ｍ≦−４．４７Ｒ＋３１９
５≦Ｒ≦２５
Ｒ：磁性キャリアの個数平均粒径（μｍ）
Ｍ：磁性キャリアの１キロエルステッドにおける磁化の強さ（ｅｍｕ／ｃｍ３） In magnetic carrier particles containing at least a binder resin and magnetic metal oxide particles,
The number average particle diameter Dn of the magnetic carrier particles is 5 to 25 μm,
The specific resistance of the magnetic carrier particles is 5.0 × 10 13 Ωcm or more when 25 V to 500 V is applied,
The true specific gravity of the magnetic carrier particles is 3.0 to 4.9 g / cm 3 ,
The magnetic carrier particle has a magnetization intensity of 100 to 300 emu / cm 3 at 1 kilo-Oersted,
Fe (II) content with respect to the eluted iron element concentration on the surface of the magnetic carrier particles is 0.001 to 5.0% by weight,
A magnetic carrier satisfying the following formula:
−6.25R + 307 ≦ M ≦ −4.47R + 319
5 ≦ R ≦ 25
R: Number average particle diameter of magnetic carrier (μm)
M: Magnetization strength (emu / cm 3 ) at 1 kilo-Oersted of the magnetic carrier 該磁性キャリア粒子はバインダー樹脂、表面を親油化処理した磁性金属酸化物及び非磁性金属酸化物を有し、かつ該キャリアコア粒子中の該金属酸化物総量が５０〜９９重量％であることを特徴とする請求項１に記載の磁性キャリア。 The magnetic carrier particles the binder resin, the surface has a lipophilic treatment magnetic metal oxide was and the non-magnetic metal oxide, and that the metal oxide amount in the carrier core particles is 50 to 99 wt% The magnetic carrier according to claim 1. 該磁性キャリアを構成するバインダー樹脂が硬化型フェノール樹脂であり、磁性金属酸化物がマグネタイトであり、該磁性キャリアが直接重合法により得られることを特徴とする請求項１または２に記載の磁性キャリア。 The binder resin constituting the magnetic carrier is a curable phenolic resin, magnetic metal oxide is magnetite, the magnetic carrier of claim 1 or 2, magnetic carrier is characterized in that it is obtained by direct polymerization method . 該磁性キャリア粒子が、表面近傍にヘマタイトを含有し、磁性キャリア粒子表面の溶出鉄元素濃度に対するＦｅ（ＩＩ）含有量が０．００１〜５．０重量％であることを特徴とする請求項１乃至３のいずれかに記載の磁性キャリア。 The magnetic carrier particles according to claim containing hematite in the vicinity of the surface, Fe (II) content relative elution iron element concentration of the magnetic carrier particle surfaces is characterized by a 0.001 to 5.0 wt% 1 4. The magnetic carrier according to any one of 1 to 3. 該磁性キャリア粒子を構成する磁性金属酸化物粒子の個数平均粒径ｒａとヘマタイト粒子の個数平均粒径ｒｂとの比ｒｂ／ｒａが１．０を越えることを特徴とする請求項１乃至４のいずれかに記載の磁性キャリア。 The magnetic ratio rb / ra of the number average particle size rb of the number average particle diameter ra and hematite particles of the carrier magnetic metal oxide particles in which the particles constituting the one. Magnetic carrier according to any one of claims 1 to 4, characterized in that exceed 0. 該磁性キャリアの表面が、シリコーン系樹脂によってコートされていることを特徴とする請求項１乃至５のいずれかに記載の磁性キャリア。 The magnetic surface of the carrier, the magnetic carrier according to any one of claims 1 to 5, characterized in that it is coated with a silicone resin. 少なくとも磁性キャリアとトナーからなる二成分系現像剤において、
磁性キャリア粒子はバインダー樹脂及び磁性金属酸化物粒子を少なくとも含有し
磁性キャリア粒子の個数平均粒子径が５〜１００μｍであり、
磁性キャリア粒子の比抵抗が２５Ｖ〜５００Ｖ印加時に５．０×１０１３Ωｃｍ以上であり、
磁性キャリア粒子の真比重が３．０〜４．９ｇ／ｃｍ３であり、
磁性キャリア粒子の１キロエルステッドにおける磁化の強さが１００〜３００ｅｍｕ／ｃｍ３であり、
磁性キャリア粒子表面の溶出鉄元素濃度に対するＦｅ（ＩＩ）含有量が０．００１〜５．０重量％であり、
磁性キャリアは下記式を満足することを特徴とする磁性キャリアであり、
−６．２５Ｒ＋３０７≦Ｍ≦−４．４７Ｒ＋３１９
５≦Ｒ≦２５
Ｒ：磁性キャリアの個数平均粒径（μｍ）
Ｍ：磁性キャリアの１キロエルステッドにおける磁化の強さ（ｅｍｕ／ｃｍ３）
トナーは、重量平均粒径が１〜１０μｍであり、個数基準の変動係数が０〜３５％であり、個数平均粒径０．２μｍ以下の無機微粒子、個数平均粒径０．２μｍ以下の有機微粒子またはそれらの混合物が外添剤として含有されていることを特徴とする二成分系現像剤。 In a two-component developer comprising at least a magnetic carrier and a toner,
The magnetic carrier particles contain at least a binder resin and magnetic metal oxide particles, and the number average particle diameter of the magnetic carrier particles is 5 to 100 μm,
The specific resistance of the magnetic carrier particles is 5.0 × 10 13 Ωcm or more when 25 V to 500 V is applied,
The true specific gravity of the magnetic carrier particles is 3.0 to 4.9 g / cm 3 ,
The magnetic carrier particle has a magnetization intensity of 100 to 300 emu / cm 3 at 1 kilo-Oersted,
Fe (II) content with respect to the eluted iron element concentration on the surface of the magnetic carrier particles is 0.001 to 5.0% by weight,
The magnetic carrier is a magnetic carrier characterized by satisfying the following formula,
−6.25R + 307 ≦ M ≦ −4.47R + 319
5 ≦ R ≦ 25
R: Number average particle diameter of magnetic carrier (μm)
M: Magnetization strength (emu / cm 3 ) at 1 kilo-Oersted of the magnetic carrier
The toner has a weight average particle diameter of 1 to 10 μm, a number-based variation coefficient of 0 to 35%, inorganic fine particles having a number average particle diameter of 0.2 μm or less, and organic fine particles having a number average particle diameter of 0.2 μm or less. Alternatively, a two-component developer containing a mixture thereof as an external additive. 該トナーは、粒子全体、または一部が重合法により形成され、該トナーの形状係数ＳＦ−１が１００〜１３０であることを特徴とする請求項７に記載の二成分系現像剤。 The toner is formed by whole grains or partially polymerization, two-component developer according to claim 7, the shape factor SF-1 of the toner is characterized in that 100 to 130. 該磁性キャリア粒子を構成するバインダーが硬化型フェノール樹脂であり、磁性金属酸化物がマグネタイトであり、該磁性キャリアの形状係数ＳＦ−１が１００〜１３０であることを特徴とする請求項７または８に記載の二成分系現像剤。 The binder constituting the magnetic carrier particles are curable phenolic resin, a magnetic metal oxide is magnetite, Claim 7 or 8 shape factor SF-1 of the magnetic carrier is characterized in that 100 to 130 The two-component developer described in 1. 該磁性キャリアが、請求項４乃至６のいずれかに記載の磁性キャリアであることを特徴とする請求項７乃至９のいずれかに記載の二成分系現像剤。   The two-component developer according to any one of claims 7 to 9, wherein the magnetic carrier is the magnetic carrier according to any one of claims 4 to 6.
JP2003329350A 2003-09-22 2003-09-22 Magnetic carrier and binary system developer Pending JP2005099072A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003329350A JP2005099072A (en) 2003-09-22 2003-09-22 Magnetic carrier and binary system developer

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Application Number Priority Date Filing Date Title
JP2003329350A JP2005099072A (en) 2003-09-22 2003-09-22 Magnetic carrier and binary system developer

Publications (2)

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JP2005099072A JP2005099072A (en) 2005-04-14
JP2005099072A5 true JP2005099072A5 (en) 2006-07-20

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4607008B2 (en) * 2005-12-28 2011-01-05 株式会社リコー Carrier, developer, developer containing container, process cartridge, image forming apparatus, and image forming method
JP4836812B2 (en) * 2007-01-29 2011-12-14 株式会社リコー Carrier and developer, and image forming method and process cartridge
JP4470981B2 (en) 2007-09-12 2010-06-02 富士ゼロックス株式会社 Image forming apparatus
JP5924486B2 (en) 2012-05-31 2016-05-25 戸田工業株式会社 Method for producing magnetic carrier for electrophotographic developer and method for producing two-component developer
US8921023B2 (en) * 2012-08-08 2014-12-30 Canon Kabushiki Kaisha Magnetic carrier and two-component developer

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