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    4.
    发明专利
    未知

    公开(公告)号：DE69425395T2

    公开(公告)日：2001-02-22

    申请号：DE69425395

    申请日：1994-04-26

    Applicant: KAO CORP

    Inventor： KAWAJI HIROYUKI ,  MORIMOTO EIZI ,  SUENAGA KEN-ICHI ,  SEMURA TETSUHIRO ,  AOKI KATSUTOSHI ,  KAWABE KUNIYASU

    IPC: G03G9/087

    Abstract: The toner for electrophotography contains a binder resin, wherein the binder resin has a condensation polymerization-type resin for forming a matrix and an addition polymerization-type resin for forming a dispersed domain. The dispersed domain with a cross-sectional diameter of not more than 2 mu m has an areal proportion of not less than 90%, based on the total cross-sectional area of the dispersed domain. This toner is stable, which is capable of maintaining a suitable tribo electric charge, thereby providing a high image quality in which the formed images do not undergo deterioration even under severe environmental conditions. Moreover, in a fixing method using a heat roller, fixing at a low temperature can be performed without using an offset inhibiting liquid.

    5.
    发明专利
    未知

    公开(公告)号：DE69421958D1

    公开(公告)日：2000-01-13

    申请号：DE69421958

    申请日：1994-04-26

    Applicant: KAO CORP

    Inventor： AOKI KATSUTOSHI ,  MORIMOTO EIZI ,  KAWAJI HIROYUKI ,  SUENAGA KEN-ICHI ,  SEMURA TETSUHIRO ,  KAWABE KUNIYASU

    IPC: C08G63/00 ,  G03G9/087 ,  C08G85/00

    Abstract: The method of producing a binder resin has the steps of blending in advance (a) a starting material monomer mixture for two polymerization reaction types, (b) a compound which can react with both of starting material monomers for the two polymerization reaction types, and (c) a tricarboxylic or higher polycarboxylic acid or a derivative thereof, the two polymerization reaction types having independent reaction paths to each other in one reaction vessel; and concurrently carrying out the two polymerization reactions in one reaction vessel to give the binder resin. According to the present invention, the binder resin which has an excellent environmental stability in the tribo electric charge and the image quality, and also has good pulverizability and transparency can be produced. Moreover, in a fixing method using a heat roller, fixing at a low temperature can be performed without using an offset inhibiting liquid. By using such a binder resin, a toner for electrophotography and a developer having excellent performance can be obtained.

    8.
    发明专利
    未知

    公开(公告)号：DE69407454T2

    公开(公告)日：1998-04-16

    申请号：DE69407454

    申请日：1994-03-14

    Applicant: KAO CORP

    Inventor： YASUDA SHIN-ICHIRO ,  KAWABE KUNIYASU ,  AKIYAMA KOJI ,  SASAKI MITSUHIRO ,  KAMEYAMA KOJI

    IPC: G03G9/093 ,  G03G13/08 ,  G03G9/09

    Abstract: A developing method of the present invention has the steps of forming a uniform layer of a nonmagnetic one-component toner on a developer carrying sleeve with a developer blade; rotating an electrostatic latent image forming member and the developer carrying sleeve; and applying the toner on the developer carrying sleeve onto an electrostatic latent image formed on the electrostatic latent image forming member. The toner used herein is an encapsulated toner having a heat-fusible core material and a shell formed thereon. By using this development for a nonmagnetic one-component toner of the present invention, clear images free from background can be stably formed for a large number of copying.

    9.
    发明专利
    未知

    公开(公告)号：DE69434884T2

    公开(公告)日：2007-06-21

    申请号：DE69434884

    申请日：1994-07-07

    Applicant: KAO CORP

    Inventor： HAYASHI NORIHIRO ,  YOSHIMURA KANJI ,  KATOH TOHRU ,  KAWABE KUNIYASU

    IPC: G03G9/097 ,  G03G9/087 ,  G03G9/10

    Abstract: A developer composition of the present invention contains a toner having at least a binder resin, a coloring agent and a toner scum preventive. The binder resin contains as a main component a polyester resin or a resin produced by concurrently carrying out addition polymerization and condensation polymerization in one reaction vessel. By using the toner of the present invention, since the formation of toner scum on the carrier surface can be prevented for a long period of time in the service life of the developer while retaining the low-temperature fixing ability of the toner, the carrier resistance and the triboelectric charge can be stably maintained, thereby providing a developer composition with a long service life. Accordingly, besides having a long service life mentioned above, the developer composition is highly suitably used for a high-speed semiconductive magnetic development.

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