Toda Kogyo Corporation

Todyo Kogyo Corporation

Toda Kogyo Cororation

Keisuke Iwasaki

Kazuyuki Hayashi

Hiroko Morii

Yasuyuki Tanaka

Mamoru Kamigaki

Mineko Ohsugi

Minoru Ohsugi

Norio Sugita

Masaaki Maekawa

Yusuke Shimohata

Mineko Sakoda

Hiroko Itamochi

Toshiharu Harada

Akihiro Nishimura

Tosiharu Harada

Seiji Ishitani

Masaru Isoai

Yoshiro Okuda

Kazushi Takama

Composite particles of the present invention comprise white inorganic particles, a surface modifier coating layer formed on surface of the respective white inorganic particles, and a dye or lake coat adhered onto the surface of the respective surface-modifier-coated white inorganic particles. The composite particles of the present invention not only exhibit excellent color-developing property and tinting strength but also suppress bleeding.

Composite particles, and coloring composition and resin composition using the same

A coloring composition for a color filter composed of composite particles having an average particle diameter of 0.00 1 to 1.0 &#x3bc;m, and containing white inorganic particles, a glue coating layer formed on the surface of the white inorganic particle and an organic pigment coat formed on the glue. A dispersant, binder resin, monomer as a reactive diluent, a polymerization initiator and a solvent are also present. The colorant provides not only a sharp particle size distribution but also excellent light resistance.

Coloring composition for color filter containing colorant and color filter using the same

Composite particles having an average particle diameter of 0.001 to 10.0 &#x3bc;m, comprise:

Composite particles, process for producing the same, and pigment, paint and resin composition using the same

A magnetic recording medium comprises: Such a magnetic recording medium exhibits not only a smooth surface, a smaller light transmittance and a lower surface electrical resistivity value, but also a small friction coefficient and an excellent running durability.

Black magnetic acicular composite particles for magnetic recording medium and magnetic recording medium using the same

A black toner comprises a binder resin and black composite particles having an average particle diameter of 0.005 to 0.30 &#x3bc;m, and comprising: extender pigments as core particles; a gluing agent-coating layer formed on surface of the respective core particles; and a black pigment coat uniformly formed on the gluing agent-coating layer in an amount of 1 to 500 parts by weight based on 100 parts by weight of the extender pigments. Such a black toner using black composite particles having not only excellent blackness, fluidity and light resistance, but also an excellent dispersibility in binder resins, which toner also exhibits excellent blackness, fluidity and light resistance.

Black toner

Non-magnetic composite particles composed of non-magnetic core particles having an average particle size of 0.01 to 0.3 &mgr;m, and inorganic fine particles having an average particle size of 0.001 to 0.07 &mgr;m. The fine particles are present in an amount of 0.1 to 20% by weight based on the weight of the non-magnetic particles are on the surface of each non-magnetic particle, and are fixed or anchored on the surface of each non-magnetic particle through a silicon compound The non-magnetic composite particles have a high polishing effect and a high dispersibility, and are useful as a non-magnetic undercoat layer for a magnetic recording medium.

Non-magnetic composite particles, process for producing the same and magnetic recording medium using the same

A magnetic recording medium composed of a non-magnetic base film; a non-magnetic undercoat layer formed on the non-magnetic base film, including a binder resin and non-magnetic acicular black iron-based composite particles; and a magnetic coating film comprising a binder resin and magnetic particles. The non-magnetic acicular black iron-based composite particles having an average major axis diameter of about 0.011 to 0.35 &mgr;m, and are composed of acicular hematite particles or acicular iron oxide hydroxide particles (as core particles) having an average major axis diameter of 0.01 to 0.3 &mgr;m; a coating layer formed on the surface of the core particles of a specific organosilicon compound; and a single carbon black coat formed on the coating layer in an amount of 21 to 50 parts by weight based on 100 parts by weight of the core particles.

Magnetic recording medium, non-magnetic acicular black iron-based composite particles and process for producing the particles

Composite particles, and tread rubber composition, paint and resin composition using the same

A magnetic recording medium using black magnetic acicular composite particles produced by forming a single carbon black coat between the surface of magnetic acicular cobalt-coated iron oxide particle or magnetic acicular metal particle and a coating comprising at least one organosilicon compound, in an amount of from more than 10 to 40 parts by weight based on 100 parts by weight of the magnetic acicular particles, exhibits not only a smooth surface, a smaller light transmittance and a lower surface electrical resistivity value, but also a small friction coefficient and an excellent running durability.

Black magnetic acicular containing composite particles magnetic recording medium

Color toner

Hematite particles aggregates as non-magnetic particles of the present invention are capable of forming a non-magnetic undercoat layer of a magnetic recording medium having a more excellent surface smoothness, which can exhibit not only an excellent dispersibility but also have an improving ability of a surface smoothness of a coating film produced therefrom by calendering treatment, a non-magnetic undercoat layer for magnetic recording medium which contains the hematite particles aggregates is exhibits a more excellent surface smoothness, and a magnetic recording medium having the non-magnetic undercoat layer, is exhibits a more excellent surface smoothness.

Hematite particles aggregates, non-magnetic undercoatt layer for magnetic recording medium using the same, and magnetic recording medium having the non-magnetic undercoat layer

Black colorant for ink-jet printing ink, ink-jet printing ink, and aqueous pigment dispersion containing the black colorant

Magnetic recording medium, non-magnetic acicular composite particles and process for producing the particles

A colorant for ink-jet printing ink of the present invention, has an average particle diameter of 0.001 to 0.15 &mgr;m, and comprises: extender pigments as core particles; a gluing agent coating layer formed on at least a part of surface of said core particle; and an organic pigment coat uniformly formed on at least a part of said gluing agent coating layer. The colorant for ink-jet printing ink exhibits not only a high tinting strength and a clear hue, but also excellent dispersibility and light resistance in spite of fine particles.

Colorant for ink-jet printing ink, ink-jet printing ink, aqueous pigment dispersion containing the colorant, and organic and inorganic composite particles

Organic and inorganic composite pigments having an average particle diameter of 0.01 to 10.0 &mgr;m composed of a white inorganic particle, an organosilane compound obtained from alkoxysilanes, or polysiloxanes coating on the white inorganic particle, and an organic pigment coat formed on said coating. An ultraviolet light-absorbing agent is present in any portion from the surface of the white inorganic particle to surface of the organic pigment coat. These composite pigments have reduced amounts of organic pigments desorbed from their surface and exhibit excellent light resistance due to their ultraviolet absorbing property.

Growing community of inventors

Hiroshima, Japan

Keisuke Iwasaki