Hoechst Aktiengesellschaft

Cassella Aktiengesellschaft

Horst Frohlich

Rainer Helwerth

Helmut Diery

Horst Lorke

Karl-Heinz Keil

Helmut Berenbold

Werner Wellbrock

Herbert Wirtz

Georg-Wolfgang Eckardt

In the process for the preparation of 2-substituted 1-(acylaminoalkyl)-2-imidazolines of the general formula I ##STR1## wherein R denotes an alkylene radical and R.sup.1 denotes a fatty acid radical, for example, a fatty acid and a dialkylenetriamine are reacted in a molar ratio of (1.9 to 2.0): 1 in such a way that the dialkylenetriamine is initially introduced hot under an inert gas atmosphere and the fatty acid is metered in hot and the amido amine formation is subsequently completed by heating to temperatures from 140.degree. to 190.degree. C. and the cyclization to the compound of the formula I is subsequently carried out at an under-pressure of at least 50 mbar.

Process for the preparation of 2-substituted

Anticorrosive agent stable to hard water, which comprises an alkali metal salt, alkaline earth metal salt, or amine salt of a compound of the formula ##STR1## in which R.sub.1 is branched C.sub.6 -C.sub.13 -alkyl or C.sub.5 - or C.sub.6 -cycloalkyl, or polycycloalkyl having from 6 to 13 carbon atoms optionally substituted by 1 or 2 C.sub.1 -C.sub.4 -alkyl groups,

Anticorrosive agent stable to hard water

Water-miscible corrosion inhibitors, substantially consisting of

Water miscible corrosion inhibitors

Aqueous metal working liquids containing a bis-sulfonamidocarboxylic acid of the formula ##SPC1## In the form of its water soluble or water dispersible salt with an alkali or an organic base, as corrosion protection and metal-working agent wherein R.sub.1 denotes hydrogen, halogen, alkyl and/or alkoxy of 1 to 3 carbon atoms, R.sub.2 denotes an alkylene radical having a total of 1 to 5 carbon atoms, and x denotes an integer of from 2 to 6.

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Eppstein, Germany

Horst Frohlich