Toner

Provided is a toner which is characterized by providing stable images even after a long-term storage with less gloss unevenness in the fixed images, while exhibiting good fixability on cardboard even in a high-speed development system that has a fixing unit configuration wherein the pressure within...

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Bibliographic Details
Main Authors HOTTA YOJIRO, FUKUDOME KOSUKE, MORIBE SHUHEI, TERAUCHI KAZUO, IDA TETSUYA, MITA SATOSHI
Format Patent
LanguageEnglish
Published 18.03.2015
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:Provided is a toner which is characterized by providing stable images even after a long-term storage with less gloss unevenness in the fixed images, while exhibiting good fixability on cardboard even in a high-speed development system that has a fixing unit configuration wherein the pressure within a fixing nip is low. A toner of the present invention comprises toner particles that contain a polyester resin (A), a polyester resin (B) and a coloring agent. The polyester resin (A) has a crystal nucleator portion and a polyester portion having a moiety that can have a crystal structure, and the crystal nucleator portion is bonded to an end of the polyester portion. The polyester resin (B) does not have a moiety that can have a crystal structure, and the ratio of a component of the polyester resin (B) having a molecular weight of 1,500 or less in the GPC chart of the THF-soluble fraction of the polyester resin (B) is 5.0-15.0% by area. If Sa ((cal/cm )1/2) is the SP value of the polyester portion of the polyester resin (A) and Sb ((cal/cm )1/2) is the SP value of the polyester resin (B), Sa and Sb satisfy the following relational expressions. 9.50<=Sa<=11.00, and -0.65<=Sb-Sa<=0.70.
Bibliography:Application Number: CN201380033073