Katayama Chemical, Inc.

Katayama Chemical Works Co., Ltd.

Kazuo Marugame

Sadaoki Kanada

Sakae Katayama

Sakae Katayama, Deceased

Yoshinari Kawasaki

Tadahiko Asano

Hiroshi Asai

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

Growing community of inventors

Kawachinagano, Japan

Kazuo Marugame