Toda Kogyo Corporation

Hiroshi Akai

Toshiyuki Hakata

Yasuhiko Fujii

Koso Aoki

Hiromitsu Misawa

Naoki Uchida

Kazutoshi Sanada

Ryo Iwai

Shinsuke Maruyama

Kazushi Nishimoto

The present invention provides an inexpensive infrared reflecting black pigment which comprises Fe and Mn but comprises no harmful elements, and exhibits an excellent infrared reflecting property. The infrared reflecting black pigment according to the present invention comprises a compound comprising Fe, Mn and at least one element selected from the group consisting of Mg, Al, Ca, Si, Sr and Ba, and has a blackness (L* value) of not more than 30 and a solar radiation reflectance of not less than 15%.

Infrared reflecting black pigment, and paint and resin composition using the infrared reflecting black pigment

There are provided magnetic iron oxide particles having an average particle diameter (Dp) of primary particles of 0.05 to 0.3 &#x3bc;m, an average particle diameter (Da) of secondary particles of 0.055 to 0.9 &#x3bc;m, and a ratio of the average particle diameter (Da) of the secondary particles to the average particle diameter (Dp) of the secondary particles (Da/Dp) of 1.1 to 3.0, as well as a magnetic toner containing the magnetic iron oxide particles. The magnetic iron oxide particles of the present invention are in the form of small agglomerated particles and exhibit an excellent dispersibility, and the magnetic toner using the magnetic iron oxide particles is excellent in electrification stability.

Magnetic iron oxide particles and magnetic toner using the same

Magnetic particles of the present invention comprise:

Magnetic particles and magnetic carrier for electrophotographic developer

Growing community of inventors

Hiroshima-ken, Japan

Hiroshi Akai