Tateho Chemical Industries Co., Ltd.

Ryuichi Ishibashi

Atsuya Kawase

Shigeo Miyata

Hirofumi Kurisu

Yasunori Kitano

Kaori Yamamoto

Mareshi Takegaki

Toshikazu Kodani

The object is to provide a high-purity magnesium oxide particle aggregate that is redispersible and can be supplied with keeping high purity, and a method for producing the same. A magnesium oxide particle aggregate that is an aggregate of magnesium oxide particles, wherein the magnesium oxide particles have an average particle size of 1 &#x3bc;m or less, and comprises Si, Al, Ca, Fe, V, Cr, Mn, Ni, Zr, B and Zn as impurities in their respective amounts of 10 ppm by mass or less, wherein the total amount of the impurities is 100 ppm by mass or less.

Magnesium oxide particle aggregate and method for producing the same

A metal hydroxide solid solution and a metal oxide solid solution, wherein the crystal form is an octahedron comprising upper and lower parallel basal planes and six peripheral pyramidal planes, the pyramidal planes consisting of upward-inclined planes and downward-inclined planes which are alternatively located. The ratio of the major axis diameter of the basal plane to the thickness between the upper and lower basal planes (major axis diameter/thickness) if,to,This improves fluidity, processability and the like when the solid solutions are kneaded into resins and the like.

Metal hydroxide solid solution, metal oxide solid solution and processes for their production

By hydrating a metal oxide solid solution shown as the following formula (3), wherein an average primary crystal particle diameter is in the range of 1 to 10 .mu.m, in the presence of monocarboxylic acid and/or oxymonocarboxylic acid in aqueous medium,

Metal hydroxide and oxide solid solutions having high aspect ratios and

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Ako, Japan

Ryuichi Ishibashi