Arakawa Kagaku Kogyo Kabushiki Kaisha

Nabco Limited

Yoshihiro Kodama

Masao Maeda

Seiichi Tsuchida

Hiroari Hara

Yasukazu Furuichi

Kiyoshi Kanagawa

In an artificial leg for a person having an upper thigh cut and a knee joint lost, a cylinder disposed between upper and lower leg members, which are coupled through a pivotable joint, for controlling bending and straightening of the joint by an air cushion for convenience of walking. The cylinder includes a cylindrical sleeve closed at both ends and a piston having a piston rod and sliding in the sleeve, and has its structure improved by using as a cushion one of two inner cavities separated by the piston, which encloses the piston rod, thereby buffering butting between the upper and lower leg members to remove unpleasant shock resulting at the end of straightening the joint.

Cylinder for artificial leg

A process for preparing a colorless rosin comprising a step for purifying a disproportionated rosin and hydrogenating the rosin. According to the process, a rosin having a color nearly equal to colorless and is excellent in various properties such as odorless at heating and stability is prepared.

Process for preparing colorless rosin

A process for preparing a rosin ester which comprises purifying a rosin and/or a disproportionated rosin, esterifying the resulting purified rosin and/or purified disproportionated rosin with an alcohol and subjecting the esterified rosin and/or esterified disproportionated rosin to hydrogenating. The resulting rosin ester has superior color nearly equal to colorless and is excellent in various properties such as odor at heating, stability and compatibility with organic polymers.

Process for preparing rosin ester with esterification and hydrogenation

Pressure-sensitive adhesive compositions

Hot-melt adhesive compositions comprising a partially (fumarized and/or

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Kobe, Japan

Yoshihiro Kodama