Katayama Chemical Works Co., Ltd.

Daicel Corporation

Katayama Chemical, Inc.

Sadaoki Kanada

Sakae Katayama

Kazuo Marugame

Sakae Katayama, Deceased

Yasuhiro Sakaguchi

Yoshinari Kawasaki

Toru Yasunaga

Tadahiko Asano

Katsumi Kojima

Hiroshi Asai

Kunio Nishmura

Michitake Kamata

A water treatment agent for boilers which comprises as active ingredients a compound which can release aliphatic hydroxycarboxylic acid ions in water and a polyamine represented by the following formula (I) or an acid addition product thereof:

Water treatment agent and water treatment method for a boiler

A corrosion inhibitor for ferrous metals comprising four different components of (a) an inorganic acid component (such as molybdate or tungstate), (b) an aliphatic hydroxycarboxylic or aliphatic dicarboxylic acid or its salt (such as citric acid, gluconic acid or succinic acid), (c) an inorganic heavy metal compound (such as zinc chloride or stannous chloride) and (d) a water soluble polymer component having a molecular weight of 500-100,000 (such as acylic homo or copolymer), which is especially advantageous for use in water recycling system.

Corrosion inhibitor

New gel product for exterminating harmful marine organisms. Comprises (a) about 1 to 25% by weight of a natural high molecular weight compound capable of forming a gel in water, (b) about 5 to 30% by weight of an agent for exterminating harmful marine organisms, (c) about 1 to 25% by weight of at least one compound selected from the group consisting of a water soluble synthetic linear polymer, an inorganic substance, a surfactant, an organic solvent, a gel-modifier, and mixtures thereof, and (d) water.

Gel product for destroying harmful marine organisms and method of

The present invention relates to a method and apparatus for treating waste water on ships, and more particularly to a method and apparatus for treating waste water on ships in a closed system.

Method and apparatus for treating waste water on ships

Growing community of inventors

Ibaraki, Japan

Sadaoki Kanada