Ciba-Geigy Corporation

Ciba Geigy (UK) Limited

Ciba-Geigy Ag

Norman Richardson

Peter Miles

Michael A Finan

Malcolm John Smith

Barry Cook

Joseph Tames

Brian G Clubley

Richard J Dellar

Alan Marshall

David L Buszard

Aqueous or partly aqueous systems are treated against the corrosion of metals, especially ferrous metals, in contact therewith, and/or against scale deposition therefrom, by adding to these systems from 0.1 to 50 000 ppm of 2-hydroxyphosphonoacetic acid having the formula I ##STR1## or a water-soluble salt thereof.

Systems inhibited against corrosion and/or scale deposition

The invention provides salts of methyl phosphonic acid and its mono- or di-methyl ester with certain amines. The salts are useful flame retardant additives for polyurethanes and polyisocyanurates.

Phosphonic acid salts as flame retardants for polyurethanes and

Compositions useful for inhibiting the corrosion of ferrous metals in contact with aqueous systems comprise (a) a telomeric compound of formula: ##STR1## or salts thereof, wherein R.sup.11 is hydrogen or a methyl or ethyl residue; R is hydrogen, a straight- or branched alkyl residue having from 1-18 carbon atoms, a cycloalkyl residue having from 5-12 carbon atoms, an aryl residue, an aralkyl residue, a residue of formula: ##STR2## wherein R.sup.11 has its previous significance; and the sum of n+m is an integer of at most 100; or a residue --OX wherein X is hydrogen or a straight- or branched alkyl residue having 1-4 carbon atoms and R.sup.1 is a residue --OX, wherein X has its previous significance.

Telomeric phosphorus corrosion inhibiting compositions

A method of inhibiting scale formation by salts of calcium, magnesium, barium and strontium from aqueous solutions, by adding to the aqueous solution a minor proportion of a product comprising a telomer of formula I: ##STR1## or a salt thereof, wherein X is CO.sub.2 H when Y is H and vice versa, B and B' are each hydrogen or B is CH.sub.3 when B' is H or vice versa, m is an integer from 2 to 100 and n is 0 or 1, R is alkyl having 1 to 22 carbon atoms substituted by one or more hydroxy groups.

Novel compositions of matter for use in the treatment of aqueous systems

A method of inhibiting the precipitation of scale-forming salts of calcium, magnesium, barium and strontium from aqueous systems which involves adding to the aqueous system a telomeric compound of the formula: ##STR1## and the salt forming derivatives thereof, wherein: R.sup.11 is H, CH.sub.3, C.sub.2 H.sub.5 ; R.sup.1 is --OX wherein X is alkyl of 1-4 carbon atoms or hydrogen; R is hydrogen, alkyl of 1-18 carbon atoms, cycloalkyl of 5-12 carbon atoms, phenyl or benzyl, and n is a positive integer of at most 100.

Treatment of aqueous systems

A method of inhibiting the precipitation of the scale forming salts of calcium, magnesium, barium and strontium from aqueous systems comprising adding to the aqueous system a minor proportion of a product comprising a telomeric compound of the formula: ##STR1## or salts thereof, wherein R.sup.11 is hydrogen or a methyl or ethyl residue and n is a positive integer of at most 100, R is hydroxyl and R.sup.1 is hydroxyl.

A method of inhibiting scale formation by salts of calcium, magnesium, barium and strontium from aqueous solutions, by adding to the aqueous solution a minor proportion of a product comprising a telomer of formula I: ##STR1## or a salt thereof, wherein X is CO.sub.2 H when Y is H and vice versa, B and B' are each hydrogen or B is CH.sub.3 when B' is H or vice versa, m is an integer from 2 to 100 and n is 0 or 1, R is an hydroxyl group, alkyl having from 1-22 carbon atoms substituted by one or more carboxyl groups.

A method of inhibiting the precipitation of the scale forming salts of calcium, magnesium, barium and strontium from aqueous systems comprising adding to the aqueous system a minor proportion of a product comprising a telomeric compound of the formula: ##STR1## or salts thereof, wherein R.sup.11 is hydrogen or a methyl or ethyl residue and n is a positive integer of at most 100, R is a residue --OX wherein X is a straight or branched alkyl residue having from 1 to 4 carbon atoms, and R.sup.1 is a residue --OX wherein X has its previous significance.

A method of inhibiting the precipitation of scale-forming salts of calcium, magnesium, barium and strontium from aqueous systems comprising adding to the aqueous system a telomeric compound of the formula: ##STR1## or salts thereof, wherein R.sup.11 is hydrogen, methyl or ethyl, R is hydrogen, 1-18C alkyl, 5-12C cycloalkyl, aryl, aralkyl, a residue of formula: ##STR2## wherein R.sup.11 has its previous significance and the sum of n + m is an integer of at most 100, or a residue --OX wherein X is hydrogen or 1-4C alkyl, and R.sup.1 is a residue --OX wherein X has its previous significance.

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Middleton, United Kingdom

Norman Richardson