Dearborn Chemicals, Ltd.

W. R. Grace Co.-conn.

Stuart W Longworth

John J Bennison

John G Baker

Brian Greaves

A method for treating an aqueous system is disclosed which comprises incorporating therein a water soluble organic sulphonate copolymer and an optionally N-substituted water soluble copolymer of acrylamide or methacrylamide and a copolymerizable monomer.

Inhibition of deposition in aqueous systems

Corrosion in liquid, especially aqueous systems such as cooling systems, is controlled by the addition of a vegetable tannin or a derivative thereof, a triazole, a hydroxylamine, a neutralizing amine, and a water soluble salt of a Group II metal, in particular zinc, magnesium or calcium.

Prevention of corrosion

A method of inhibiting and preventing scale in an aqueous system is described which comprises incorporating in the water at least one amino carboxylate having the formula:

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Warrington, United Kingdom

Stuart W Longworth