Nippon Shokubai Co., Ltd.

Yuji Ono

Shoichi Shibazaki

Hideki Oishi

Jiro Iriguchi

Shuji Shimizu

Masaki Nishimura

The object of the present invention is to provide silica particles which can provide a silica particle dispersion exhibiting excellent uniformity. The present invention is silica particles having an average primary particle diameter dcalculated from a specific surface area by a BET method of 1 nm or more and 100 nm or less and a ratio (d/d) of an average secondary particle diameter dmeasured by a dynamic light scattering method to the dof 1.2 or less. The silica particles of the present invention preferably have a coefficient of variation in a particle diameter measured using a transmission electron microscope at a magnification of 200,000 of 20% or less.

Silica particles

The object of the present invention is to provide silica particles which are surface-treated with a silicon compound uniformly and have improved surface characteristics and affinity with a resin. The silica particles according the present invention are surface-treated with a specific silicon compound, wherein C/Si ratio from X-ray photoelectron spectroscopy (XPS) is not less than 0.05.

Silica particles, resin composition containing said particles, and use thereof

Provided are amorphous silica particles for application to industrial fields where there are increasing desires for high purity and colorlessness. The amorphous silica particles are produced through the steps of hydrolysis of an alkoxide, vacuum drying, and firing. The amorphous silica particles have been reduced in coloration and in Fe content, which is causative of coloration of the silica, and can meet the desires. The amorphous silica is characterized by having an Fe content of 20 ppm or less.

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Hyogo, Japan

Yuji Ono