Jgc Catalysts & Chemicals Ltd.

Kazutaka Egami

Ryo Muraguchi

Tsuguo Koyanagi

Mitsuaki Kumazawa

Michio Komatsu

Miki Egami

Masayuki Matsuda

Masanobu Taniguchi

Satoshi Yoshida

Yuji Tawarasako

Yuhko Hakoshima

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

A water-repellent transparent coating-substrate assembly includes a substrate and a water-repellent transparent coating disposed on a surface of the substrate, the transparent coating including an inorganic oxide fine particle layer containing inorganic oxide fine particles, and an overcoating layer disposed on the inorganic oxide fine particle layer, the surface of the water-repellent transparent coating having irregularities including depressions and protrusions in which the protrusions have an average height (T) in the range of 30 to 500 nm and an average protrusion interval (pitch width) (W) in the range of 50 to 1000 nm, the water-repellent transparent coating having a water contact angle in the range of 130 to 180&#xb0;.

Water-repellant transparent coating-substrate assembly and process for producing the same

A catalyst for oxychlorination according to the present invention contains alumina and copper, and a content of copper is in the range from 5 to 20% by weight calculated as that of CuO, while a content of halogen is not more than 5% by weight. The catalyst is produced by the following steps (a) to (c): (a) preparing a slurry for spray-drying by adding an acid and an aqueous solution of cupric nitrate in a pseudo-boehmite alumina slurry; (b) spray-drying the slurry; and (c) burning the particles obtained in step (b).

Oxychlorination catalyst and method for preparing the same

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Kitakyushu, Japan

Kazutaka Egami