Bayer Aktiengesellschaft

Hans Geffers

Walter Radt

Herbert Kallfass

Gerhard Bohnsack

Reinhard Schliebs

Hartmut Schulz

Preventing corrosion and scale formation in water re-circulating systems by adding to the water to be circulated from about 5 to 100 g/m.sup.3, based on the weight of the water to be circulated, of a compound selected from the group consisting of those of the formula ##STR1## and the water-soluble salts thereof and then circulating said water in said system, R being hydrogen, alkyl, alkenyl or alkinyl having up to 4 carbon atoms; phenyl; cycloalkyl having 3 to 6 carbon atoms; benzyl; phenethyl or ##STR2## wherein R' is hydrogen, alkyl having 1 to 4 carbon atoms or carboxyl, R' is hydrogen or methyl and R'' is carboxyl.

Process for preventing corrosion and the formation of scale in water

Certain novel .alpha.-alkyl-phosphonosuccinic acid compounds of the formula ##STR1## in which R is lower alkyl, or alkenyl or alkynyl, cycloalkyl, or aralkyl are particularly suitable as sequestering agents, e.g., for incorporation into cleansing compositions.

.alpha.-Alkyl-phosphonosuccinic acid compounds and sequestering

Preventing corrosion and scale formation in water re-circulating systems by adding to each cubic meter of the water being re-circulated from about 5 to 100 grams of a compound selected from the group consisting of those of the formula ##EQU1## and the water-soluble salts thereof R being hydrogen, alkyl, alkenyl or alkinyl having up to 4 carbon atoms; phenyl; cycloalkyl having 3 to 6 carbon atoms; benzyl; phenethyl or ##EQU2## wherein R' is hydrogen, alkyl having 1 to 4 carbon atoms or carboxyl, R' is hydrogen or methyl and R'' is carboxyl.

Growing community of inventors

Cologne, Germany

Hans Geffers