Ciba-geigy Corporation

William P Armstrong

Emyr Phillips

Andreas Kramer

Adalbert Braig

Markus Frey

There are described novel alkaline earth metal salts, transition metal salts and transition metal complexes of compounds of the formula I ##STR1## in which R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are, independently of one another, hydrogen, halogen, nitro, cyano, CF.sub.3, C.sub.1 -C.sub.15 alkyl, C.sub.5 -C.sub.12 cycloalkyl, C.sub.2 -C.sub.15 alkenyl, C.sub.1 -C.sub.12 haloalkyl, C.sub.1 -C.sub.12 alkoxy, C.sub.1 -C.sub.12 alkylthio, C.sub.6 -C.sub.10 aryl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl; C.sub.6 -C.sub.10 aryloxy which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl; C.sub.7 -C.sub.12 arylalkyl which is unsubstituted or substituted on the aryl radical by from 1 to 3 C.sub.1 -C.sub.4 alkyl groups; --CO.sub.2 R.sub.6, --COR.sub.6 or ##STR2## where at least one of the radicals R.sub.1 to R.sub.5 is hydrogen, halogen or C.sub.1 -C.sub.15 alkyl, in addition the radicals R.sub.1 and R.sub.2, R2 and R.sub.3, R.sub.3 and R.sub.4 or R.sub.4 and R.sub.5 form, together with the carbon atoms to which they are bound, a benzo or cyclohexenyl ring, R.sub.6 is C.sub.1 -C.sub.20 alkyl, C.sub.2 -C.sub.20 alkyl interrupted by oxygen, sulfur or &gt;N--R.sub.9 ; C.sub.7 -C.sub.12 arylalkyl which is unsubstituted or substituted on the aryl radical by from 1 to 3 C.sub.1 -C.sub.4 alkyl groups, R.sub.7 and R.sub.8 are, independently of one another, hydrogen, C.sub.1 -C.sub.24 alkyl or C.sub.2 -C.sub.24 alkyl interrupted by oxygen, sulfur or &gt;N--R.sub.9, R.sub.9 is hydrogen or C.sub.1 -C.sub.8 alkyl, and n is an integer in the range from 1 to 10 for use, as corrosion inhibitors in coating compositions for protecting metal surfaces.

Alkaline earth metal salts, transition metal salts and transition metal

A coating composition comprising a) an organic film-forming binder; and b) a corrosion-inhibiting amount of a substantially water-insoluble mono- or poly-basic salt of: i) a ketoacid having the formula I: ##STR1## in which m and n, independently, are 0 or an integer from 1 to 10 provided that the sum of m and n is at least 1; A is C.sub.1 -C.sub.15 alkyl, C.sub.2 -C.sub.15 alkenyl, optionally substituted C.sub.3 -C.sub.12 cycloalkyl, C.sub.2 -C.sub.15 alkyl interrupted by one or more O-, N- or S-atoms, optionally substituted C.sub.6 -C.sub.10 aryl, optionally substituted C.sub.7 -C.sub.12 aralkyl, optionally substituted C.sub.7 -C.sub.12 aralkenyl, a heterocyclic residue or a ferrocenyl residue; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are the same or different and each is a substituent A, hydrogen, OH, O-C.sub.1 -C.sub.15 alkyl, NH.sub.2, NH(C.sub.1 -C.sub.15 alkyl), N(C.sub.1 -C.sub.15 alkyl).sub.2, CO.sub.2 H, CO.sub.2 (C.sub.1 -C.sub.15 alkyl), SO.sub.3 H, P(O) (OH).sub.2 P(O)(OH)(O-C.sub.1 -C.sub.15 alkyl), P(O) (O-C.sub.1 -C.sub.15 alkyl).sub.2, SH, S(C.sub.1 -C.sub.15 alkyl), nitro, cyano, halogen or two of R.sub.1, R.sub.2 R.sub.3 and R.sub.4, together with the carbon atoms to which they are attached, form a C.sub.3 -C.sub.12 cycloalkyl ring or C.sub.6 - or C.sub.10 aryl ring, or one of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 together with the carbon atom to which it is attached, and with the group A--C(.dbd.O)--, forms a ring, or R.sub.1 and R.sub.2, R.sub.3 and R.sub.4 form a carbonyl group or a C.dbd.C double bond, provided that A is not optionally substituted C.sub.6 -C.sub.10 aryl when R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are simultaneously hydrogen and provided that R.sub.1 and R.sub.2, or R.sub.3 and R.sub.4, respectively, are not simultaneously both OH or both NH.sub.2 ; and ii) a base selected from a) a cation of Group Ia, Ib, IIa, IIb, IIIa, IIIb, IVa, IVb, Va, VIa, VIIa or VIIIa of the Periodic Table of Elements; b) an amine of formula II which is specified herein.

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Bolton, United Kingdom

William P Armstrong