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    31.
    发明专利
    未知

    公开(公告)号：DE69426512D1

    公开(公告)日：2001-02-08

    申请号：DE69426512

    申请日：1994-08-31

    Applicant: KAO CORP

    Inventor： ASANO TETSUYA ,  SASAKI MITSUHIRO ,  YAMAGUCHI TAKASHI ,  KAWABE KUNIYASU

    IPC: G03G9/093

    Abstract: The encapsulated toner for heat-and-pressure fixing which includes a heat-fusible core material containing at least a thermoplastic resin and a coloring agent, and a shell formed thereon so as to cover the surface of the core material is produced by a process having the step of carrying out in situ polymerization using a thermoplastic resin as a main component of the shell to form a shell having a structure in which a part of the heat-fusible core material is incorporated therein, the thermoplastic resin having a mechanical loss tangent (tan delta ) in the range of from 1.0 to 20.0 based on a dynamic viscoelasticity, when measured with a sine stress having an angular frequency of 25 rad/s at a temperature of from 80 to 120 DEG C. By using the encapsulated toner, good offset resistance can be obtained in the resulting toner even when its fixing speed is slow. Also, the core material is likely to be released from the encapsulated toner upon fixing while retaining good blocking resistance and good shocking resistance.

    32.
    发明专利
    未知

    公开(公告)号：DE69407454D1

    公开(公告)日：1998-02-05

    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.

    34.
    发明专利
    未知

    公开(公告)号：DE69400658D1

    公开(公告)日：1996-11-14

    申请号：DE69400658

    申请日：1994-03-09

    Applicant: KAO CORP

    Inventor： YAMAGUCHI TAKASHI ,  SASAKI MITSUHIRO ,  ASANO TETSUYA ,  KAWABE KUNIYASU

    IPC: G03G9/093

    Abstract: A method for producing an encapsulated toner for heat-and-pressure fixing, which has a heat-fusible core material containing at least a thermoplastic resin and a coloring agent and a shell formed thereon so as to cover the surface of the core material, having the steps of coating the surface of the core material with a hydrophilic shell-forming material to form precursor particles; adding at least a vinyl polymerizable monomer and an initiator for vinyl polymerization to an aqueous suspension of the precursor particles to absorb them into the precursor particles; and then polymerizing the monomer components in the precursor particles. The method of the present invention offers toners which not only have improved storage stability but also are excellent in offset resistance, fixable at a low temperature and are further capable of forming clear images free from background.

    37.
    发明专利
    未知

    公开(公告)号：DE69329811T2

    公开(公告)日：2001-08-16

    申请号：DE69329811

    申请日：1993-09-01

    Applicant: KAO CORP

    Inventor： SASAKI MITSUHIRO ,  ASANO TETSUYA ,  KAWABE KUNIYASU ,  KAWAJI HIROYUKI ,  FUJIKI KAZUHIRO

    IPC: G03G9/087 ,  G03G9/093

    Abstract: The present invention is directed to an encapsulated toner for heat-and-pressure fixing having a heat-fusible core material containing at least a thermoplastic resin and a coloring agent and a shell formed thereon so as to cover the surface of the core material. An amorphous polyester is used as the main component of the shell, and the amount of the amorphous polyester is preferably 3 to 50 parts by weight, based on 100 parts by weight of the core material. The encapsulated toner of the present invention is excellent in offset resistance, fixable even at a low temperature and excellent in blocking resistance when it is used for heat-and-pressure fixing using a heated roller.

    38.
    发明专利
    未知

    公开(公告)号：DE69425395D1

    公开(公告)日：2000-09-07

    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.

    39.
    发明专利
    未知

    公开(公告)号：DE69421958T2

    公开(公告)日：2000-06-15

    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.

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