TONER, DEVELOPING AGENT, IMAGE FORMING APPARATUS, PROCESS CARTRIDGE AND METHOD OF IMAGE FORMATION

Title:

TONER, DEVELOPING AGENT, IMAGE FORMING APPARATUS, PROCESS CARTRIDGE AND METHOD OF IMAGE FORMATION

Document Type and Number:

WIPO Patent Application WO/2004/066031

Kind Code:

A1

Abstract:

A toner wherein the state of wax dispersion in the vicinity of the surface thereof is controlled so as not only to enhance hot offset resistance to thereby realize favorable fixability but also to enhance antiblocking properties to thereby realize excellent long-term storability. In particular, a toner comprising at least a binder resin, a colorant and a wax, characterized in that the content of wax in terms of the value, expressed by weight, wax endotherm determined in accordance with DSC (Differential Scanning Calorimetry) is in the range of 3 to 21 wt.% based on the total toner weight; the intensity ratio of (P₂₈₅₀/P₈₂₈) wherein P₂₈₅₀ represents the intensity of peak (2850 cm^-1) ascribed to the wax while P₈₂₈ represents the intensity of peak (828 cm^-1) ascribed to the binder resin as determined in accordance with FTIR-ATR (Fourier Transform Infra-Red Attenuated Total Reflection) spectroscopy, as a value defining the amount of wax being present in a region extending from the surface of toner particle to a depth of 0.3 μm, is in the range of 0.01 to 0.40; and at least portion of the wax is present in the form of multiple independent wax disperse subparticles encapsulated in the toner particles.

Inventors:

SUGIURA HIDEKI (JP)
MOCHIZUKI SATOSHI (JP)
IWAMOTO YASUAKI (JP)
ASAHINA YASUO (JP)
UMEMURA KAZUHIKO (JP)
ICHIKAWA TOMOYUKI (JP)
NAKAYAMA SHINYA (JP)
UTSUMI TOMOKO (JP)
SAKATA KOICHI (JP)

Application Number:

PCT/JP2004/000379

Publication Date:

August 05, 2004

Filing Date:

January 19, 2004

Export Citation:

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Assignee:

RICOH KK (JP)
SUGIURA HIDEKI (JP)
MOCHIZUKI SATOSHI (JP)
IWAMOTO YASUAKI (JP)
ASAHINA YASUO (JP)
UMEMURA KAZUHIKO (JP)
ICHIKAWA TOMOYUKI (JP)
NAKAYAMA SHINYA (JP)
UTSUMI TOMOKO (JP)
SAKATA KOICHI (JP)

International Classes:

G03G9/08; G03G9/087; (IPC1-7): G03G9/08

Foreign References:

JP2002006541A	2002-01-09
JP2001134011A	2001-05-18
JPH06348055A	1994-12-22
JPH09319143A	1997-12-12
JPH1020549A	1998-01-23
JP2002357929A	2002-12-13
JP2002287400A	2002-10-03
JP2002351143A	2002-12-04
JP2003295494A	2003-10-15
JP2002372806A	2002-12-26

Other References: