Mitsubishi Materials Electronic Chemicals Co., Ltd.

Naoyuki Aiba

Kensuke Kageyama

Takashi Konishi

A zirconium nitride powder coated with alumina has a volume resistivity is 1×10Ω·cm or higher. Also, an coating amount with alumina is 1.5% by mass to 9% by mass with respect to 100% by mass of the zirconium nitride. Furthermore, an isoelectric point of the zirconium nitride powder coated with alumina is 5.7 or higher.

Zirconium nitride powder coated with alumina and process for producing the same

A zirconium nitride powder having a volume resistivity of 107 &#x3a9;&#xb7;cm or more in the state of the pressurized powder body hardened at a pressure of 5 MPa, and a particle size distribution D90 of 10 &#x3bc;m or less when ultrasonically dispersed for 5 minutes in a state of being diluted with water or an alcohol having a carbon number of which is in a range of 2 to 5. Also, the zirconium nitride powder is dispersed in an acrylic monomer or an epoxy monomer to prepare a monomer dispersion. Further, the zirconium nitride powder is dispersed in a dispersing medium as a black pigment and further a resin is mixed to prepare a black composition.

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Akita, Japan

Naoyuki Aiba