Nippon Chemical Industrial Co., Ltd.

Toho Ganryo Kogyo Co., Ltd.

Toro Ganryo Kogyo Co., Ltd.

Nobuyoshi Abe

Minoru Yokoyama

Kiyoshi Kanemaru

Shigenaga Kubo

Syozo Takatsu

Kiyoshi Kanamaru

A stable inorganic pigment having the surface thereof a continuous coating of fine amorphous silica.

Method of coating inorganic pigments (ultramarine and bronze powder)

A process for preparing a stable inorganic pigment coated with a fine amorphous silica which comprises forming a silica sol in an aqueous prepared slurry of an inorganic pigment by reacting an alkali silicate solution with one or more acid gases so that a fine silica sol covers the surfaces of the particles of the inorganic pigment.

Process for preparing stable inorganic pigment

An antimony trioxide composition useful as an excellent flame retarding additive comprises antimony trioxide particles coated with hydrous zirconium oxide and amorphous silica. The antimony trioxide composition is prepared by adding an aqueous solution of a zirconium salt to an aqueous slurry of antimony trioxide particles to form zirconium hydroxide therein and to deposit the hydroxide on the surfaces of the antimony trioxide particles, recovering the particles and dehydrating them to form a coating of zirconium hydroxide on the particles, dispersing the hydrous zirconium oxide-coated particles in water, and then adding to the resulting aqueous dispersion a silica sol to deposit amorphous silica on the surfaces of the hydrous zirconium oxide coated antimony trioxide particles.

Antimony trioxide composition and process of producing the same

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Urawa, Japan

Nobuyoshi Abe