Jgc Catalysts & Chemicals Ltd.

Masanobu Taniguchi

Ryo Muraguchi

Mitsuaki Kumazawa

Miki Egami

Michio Komatsu

Tsuguo Koyanagi

Kazutaka Egami

There is provided a production method of a chain silica particle dispersion. This production method includes a dispersion preparation step of hydrolyzing alkoxysilane in the presence of ammonia to prepare a silica particle dispersion, an ammonia removal step of removing the ammonia from the silica particle dispersion such that an ammonia amount relative to silica contained in the silica particle dispersion is 0.3% by mass or less, and a hydrothermal treatment step of hydrothermally treating the silica particle dispersion having a silica concentration of 12% by mass or more, from which the ammonia has been removed, at a temperature of not lower than 150&#xb0; C. and lower than 250&#xb0; C. An abrasive including such chain silica particles is high in polishing rate and excellent in polishing properties.

Method for producing chain-like particle dispersion, and dispersion of chain-like particles

Silica particles calcined in a calcination step are supplied in a swirling flow generated by a gas introduced in a disintegration container and disintegrated therein, whereby the silica particles can be easily disintegrated and there can be obtained disintegrated silica particles having both low hygroscopicity and high dispersibility in resin. In addition, the introduction of dehumidified air (gas) during the disintegration reduces hygroscopicity and greatly improves dispersibility in resin. Furthermore, performing heating treatment (calcination) again after the disintegration causes the surface modification of the disintegrated silica particles, greatly improving hygroscopicity and dispersibility in resin. The resin composition obtained in this manner including silica particles provides good injectability and filterability when used for an underfill material for semiconductors and an in-plane spacer or sealing spacer of liquid crystal displays.

Method for producing disintegrated silica particles

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Kitakyushu, Japan

Masanobu Taniguchi