Katayama Chemical Works Co., Ltd.

Katayama Chemical Works Ltd.

Tadahiko Asano

Sakae Katayama

Sadaoki Kanada

Yoshinari Kawasaki

Masatsune Okuma

Kazuo Marugame

Keisyo Nakanishi

A scale inhibitor containing as its active component a copolymer comprising acrylic acid, methacrylic acid and a C.sub.1-8 alkyl ester of (meth)acrylic acid, the copolymer being

Scale inhibitor

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

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Sennan, Japan

Tadahiko Asano