TONER - CANON KK

Title:

TONER

Document Type and Number:

WIPO Patent Application WO/2010/010752

Kind Code:

A1

Abstract:

Provided is a toner which shows excellent performances concerning static offset and fixation tailing. A toner comprising toner particles, which at least contain a binder resin, a wax and magnetic iron oxide, and inorganic microparticles, wherein (1) the magnetic iron oxide contains at least a Ti component, an Al component, an Si component and an Fe component; (2) the content of the above-described Ti component in terms of Ti element is 0.30% by mass or more but not more than 5.00% by mass based on the whole magnetic iron oxide as described above; (3) the content of the above-described Al component in terms of Al element is 0.10% by mass or more but not more than 3.00% by mass based on the whole magnetic iron oxide as described above; (4) when the above-described magnetic iron oxide is poured into an aqueous alkali solution and the Al component contained in the above-described magnetic iron oxide is eluted with the above-described aqueous alkali solution, the amount of the Al component thus eluted is 50.0% or more but not more than 95.0% based on the total amount of the Al component contained in the magnetic iron oxide; (5) when the magnetic iron oxide, from which the Al component contained in the above-described magnetic iron oxide has been eluted with the above-described aqueous alkali solution, is further dissolved in an aqueous acid solution to give a solution and the amount of Fe element contained in the solution in which the above-described magnetic iron oxide has been completely dissolved is referred to as the total Fe element amount, then the sum of the amount of the Al component contained in a solution prepared by dissolving the above-described magnetic iron oxide until 10% by mass of the total Fe element amount as described above exists in the solution (hereinafter referred to as the solution having Fe element solubility of 10% by mass) and the amount of the Al component eluted in the above-described (4) is 95.0% or more but nor more than 100.0% of the total amount of the Al component contained in the above-described magnetic iron oxide; and (6) the ratio of the amount of the Ti component in terms of Ti element contained in the solution having Fe element solubility of 10% by mass as described above to the amount of the Al component in terms of Al element (Ti component content in terms of Ti element/Al component content in terms of Al element) is 2.0 or more but not more than 30.0, characterized in that the above-described toner has a dielectric tangent, which is calculated from the complex permittivity of the toner measured at a temperature of 140oC and a frequency of 10 kHz, of 1.0 × 10-3 to 5.0 × 10-1.

Inventors:

HASEGAWA YUSUKE
OGAWA YOSHIHIRO
NISHIKAWA KOUJI
KAMAE KENTAROU
KASUYA TAKASHIGE

Application Number:

PCT/JP2009/059652

Publication Date:

January 28, 2010

Filing Date:

May 27, 2009

Export Citation:

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Assignee:

CANON KK (JP)
HASEGAWA YUSUKE
OGAWA YOSHIHIRO
NISHIKAWA KOUJI
KAMAE KENTAROU
KASUYA TAKASHIGE

International Classes:

G03G9/083; G03G9/097

Foreign References:

JP2000272923A	2000-10-03
JPH1072218A	1998-03-17
JPH11189420A	1999-07-13
JP2003084501A	2003-03-19
JP2002221813A	2002-08-09
JPS63184762A	1988-07-30
JPH03161761A	1991-07-11
JP2000056518A	2000-02-25
JP2006113313A	2006-04-27
JP2006047367A	2006-02-16
JP2003255575A	2003-09-10
JP2004157342A	2004-06-03
JP2002341598A	2002-11-27
JP2004078055A	2004-03-11
JPH07240306A	1995-09-12
JP2004161551A	2004-06-10
JP2004354810A	2004-12-16
JP3224774B2	2001-11-05
JP3544316B2	2004-07-21

Other References: