Mizusawa Industrial Chemicals, Ltd.

Mizusawa Kagaku Kogyo Kabushiki Kaisha

Seiji Kojima

Masahide Ogawa

Teiji Sato

Koichi Usui

Masanori Tanaka

Kunio Goto

Kinichi Ono

Seikichi Takahashi

Masashi Hatano

Yasuo Mizoguchi

Hitoshi Yamamoto

Kiyohiko Imai

Yujiro Sugahara, Deceased

The present invention provides an activated clay for refining aromatic hydrocarbons such as BTX (benzene, toluene, xylene), etc., satisfying the requirements of both excellent life and excellent side-reaction-preventing property. The activated clay for treating aromatic hydrocarbons is obtained by treating dioctahedral smectite clay minerals with an acid so as to possess a BET specific surface area of not smaller than 250 m.sup.2 /g and to contain iron in an amount of not smaller than 2.5% by weight calculated as Fe.sub.2 O.sub.3.

Method of producing activated clay for treating aromatic hydrocarbons

Disclosed is a filler for a heat-sensitive recording paper comprising finely divided amorphous silica having a BET specific surface area of 10 to 100 m.sup.2 /g and a bulk density of 0.14 to 0.30 g/cc, said finely divided amorphous silica having such a secondary particle size distribution that secondary particles having a size smaller than 4 microns, as measured by the centrifugal precipitation method, occupy at least 90% by weight of the total particles. This filler is excellent in the effects of preventing the background coloration, improving the lubricating property, preventing the adhesion of scum and improving the image density.

Heat-sensitive recording paper and filler therefor

A color developer for pressure-sensitive recording paper which is derived from a clay mineral having a layer-structure composed of regular tetrahedrons of silica and which shows

Novel clay mineral color developer for pressure sensitive recording

Growing community of inventors

Nakajo, Japan

Seiji Kojima