JP2008209725A5 - - Google Patents

Download PDF

Info

Publication number
JP2008209725A5
JP2008209725A5 JP2007047114A JP2007047114A JP2008209725A5 JP 2008209725 A5 JP2008209725 A5 JP 2008209725A5 JP 2007047114 A JP2007047114 A JP 2007047114A JP 2007047114 A JP2007047114 A JP 2007047114A JP 2008209725 A5 JP2008209725 A5 JP 2008209725A5
Authority
JP
Japan
Prior art keywords
less
particles
toner
carrier
magnetic core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2007047114A
Other languages
Japanese (ja)
Other versions
JP2008209725A (en
JP5046681B2 (en
Filing date
Publication date
Application filed filed Critical
Priority to JP2007047114A priority Critical patent/JP5046681B2/en
Priority claimed from JP2007047114A external-priority patent/JP5046681B2/en
Publication of JP2008209725A publication Critical patent/JP2008209725A/en
Publication of JP2008209725A5 publication Critical patent/JP2008209725A5/ja
Application granted granted Critical
Publication of JP5046681B2 publication Critical patent/JP5046681B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Claims (2)

磁性キャリアとトナーとを含有する二成分系現像剤であって、
前記磁性キャリアは、多孔質磁性コア粒子の空孔に樹脂を含有する樹脂含有磁性粒子を含有するキャリアであり、
前記多孔質磁性コア粒子は、固め見かけ密度をρ１（ｇ／ｃｍ３）、真密度をρ２（ｇ／ｃｍ３）とした場合に、ρ１が０．８０以上、２．４０以下であり、ρ１／ρ２が０．２０以上、０．４２以下であり、
前記多孔質磁性コア粒子は、比抵抗が１．０×１０３Ω・ｃｍ以上、５．０×１０７ Ω・ｃｍ以下であり、
前記トナーが、少なくとも重合体微粒子及び着色剤微粒子を凝集して微粒子凝集体を形成する工程及び前記微粒子凝集体中の微粒子間の融着を起こさせる融着工程を含む乳化凝集法で得られるトナーであり、
前記トナーの、重量平均粒子径（Ｄ４）が、３．０μｍ以上、８．０μｍ以下であり、画像処理解像度５１２×５１２画素（１画素あたり０．３７μｍ×０．３７μｍ ）のフロー式粒子像測定装置によって計測された円相当径０．６０μｍ以上、２．００μｍ以下である粒子の割合が３０個数％以下であることを特徴とする二成分系現像剤。 A two- component developer containing a magnetic carrier and a toner,
The magnetic carrier is a carrier containing resin-containing magnetic particles containing a resin in the pores of the porous magnetic core particles,
The porous magnetic core particle has a solid apparent density of ρ1 (g / cm 3 ) and a true density of ρ2 (g / cm 3 ), and ρ1 is 0.80 or more and 2.40 or less, and ρ1 / Ρ2 is 0.20 or more and 0.42 or less,
The porous magnetic core particles have a specific resistance of 1.0 × 10 3 Ω · cm or more and 5.0 × 10 7 Ω · cm or less,
Toner obtained by an emulsion aggregation method comprising a step of agglomerating at least polymer fine particles and colorant fine particles to form a fine particle aggregate and a fusing step of causing fusion between the fine particles in the fine particle aggregate And
Flow type particle image measurement with a weight average particle diameter (D4) of 3.0 μm or more and 8.0 μm or less and an image processing resolution of 512 × 512 pixels (0.37 μm × 0.37 μm per pixel) of the toner. A two-component developer, wherein the proportion of particles having an equivalent circle diameter of 0.60 μm or more and 2.00 μm or less measured by the apparatus is 30% by number or less. 前記磁性キャリアは、平均円形度が０．８５０以上、０．９５０以下であり、円形度０．８００以上の粒子を９０個数％以上含有することを特徴とする請求項１に記載の二成分系現像剤。 2. The two-component system according to claim 1, wherein the magnetic carrier has an average circularity of 0.850 or more and 0.950 or less and contains 90% by number or more of particles having a circularity of 0.800 or more. Developer .
JP2007047114A 2007-02-27 2007-02-27 Two-component developer and developer for replenishment Expired - Fee Related JP5046681B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007047114A JP5046681B2 (en) 2007-02-27 2007-02-27 Two-component developer and developer for replenishment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007047114A JP5046681B2 (en) 2007-02-27 2007-02-27 Two-component developer and developer for replenishment

Publications (3)

Publication Number Publication Date
JP2008209725A JP2008209725A (en) 2008-09-11
JP2008209725A5 true JP2008209725A5 (en) 2010-04-15
JP5046681B2 JP5046681B2 (en) 2012-10-10

Family

ID=39786074

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007047114A Expired - Fee Related JP5046681B2 (en) 2007-02-27 2007-02-27 Two-component developer and developer for replenishment

Country Status (1)

Country Link
JP (1) JP5046681B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4864147B2 (en) 2009-03-25 2012-02-01 シャープ株式会社 Manufacturing method of resin-coated carrier, resin-coated carrier, two-component developer, developing device, image forming apparatus, and image forming method
JP4864116B2 (en) 2009-04-30 2012-02-01 シャープ株式会社 Resin-coated carrier, method for producing the same, two-component developer including the resin-coated carrier, developing device, and image forming apparatus
US8722303B2 (en) * 2011-08-31 2014-05-13 Canon Kabushiki Kaisha Image forming method
JP2024046429A (en) * 2022-09-22 2024-04-03 富士フイルムビジネスイノベーション株式会社 Electrostatic image developer, process cartridge, image forming apparatus and image forming method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4001606B2 (en) * 2005-05-31 2007-10-31 パウダーテック株式会社 Resin-filled carrier and electrophotographic developer using the carrier
JP4862181B2 (en) * 2005-06-22 2012-01-25 Ｄｏｗａエレクトロニクス株式会社 Carrier core material for electrophotographic development and production method thereof, carrier for electrophotographic development, and electrophotographic developer

Similar Documents

Publication Publication Date Title
JP2010061120A5 (en)
JP2011203690A5 (en)
CN101377627B (en) Carrier for electrostatic latent image development, and developer for electrostatic latent image development, method of forming an image, developer cartridge, process cartridge and imaging device
JP2016126340A5 (en)
JP2011053714A5 (en)
JP2017521701A (en) Anisotropically conductive dielectric layers for electrophoretic display devices
JP2008209725A5 (en)
JP2009282218A5 (en)
JP2008145490A5 (en)
CN109541901B (en) Positively chargeable toner, method for producing same, and two-component developer
JP2009020519A5 (en)
JP2013228690A5 (en)
JP2008309984A5 (en)
JP2007206482A5 (en)
JP2009109957A5 (en)
JP2009300711A5 (en)
JP2010101993A5 (en)
JP2004145325A5 (en)
JP2007147781A5 (en)
JP2008292569A5 (en)
JP2016126218A5 (en)
JP2011048159A5 (en)
JP2009116016A5 (en)
JP2013186472A5 (en)
JP2010282137A5 (en)