| abstract |
The present invention provides coating compositions comprisingn a) an organic film-forming binder; and b) a corrosion-inhibiting amount of a salt ofn i) a ketoacid having the formula (I):n wherein a is 1,2,3,4 or 5; the R substituents are the same or different and each is hydrogen; halogen; nitro; cyano; CF₃; C₁-C₁₅ alkyl; C₅-C₁₂ cycloalkyl; C₂-C₁₅ alkenyl; C₁-C₁₂ halogenoalkyl; C₁-C₁₂ alkoxy; C₁-C₁₂ thioalkyl; C₆-C₁₂ aryl; C₆-C₁₀ aryloxy; C₇-C₁₂ alkaryl; -CO₂R₁ in which R₁ is a) hydrogen, b) C₁-C₂₀ alkyl optionally interrupted by one or more O-, N- or S-atoms, c) C₇-C₁₂ alkaryl or d) C₆-C₁₂ aryl optionally substituted with one or more carboxy groups; -COR₁ in which R₁ has its previous significance; NR₂R₃ in which R₂ and R₃ are the same or different and each is hydrogen or C₁-C₂₄ alkyl optionally interrupted by one or more O, S or NH moieties; or when a is 2, 3, 4 or 5, two adjacent groups R may be the atoms required to form a fused benzene or cyclohexyl ring; and n is an integer from 1 to 10; and ii) an amine of formula II:n wherein X, Y and Z are the same or different, and are hydrogen; C₄-C₂₄ alkyl optionally interrupted by one or more O-atoms; phenyl; C₇-C₉ phenylalkyl; C₇-C₉ alkylphenyl; or two of X, Y and Z together with the N-atom to which they are attached form a 5-, 6- or 7-membered heterocyclic residue, which optionally contains a further oxygen, nitrogen or sulphur atom and which is optionally substituted by one or more C₁-C₄ alkyl, amino, hydroxy, carboxy or C₁-C₄ carboxy alkyl groups, and the other of X, Y and Z is hydrogen; provided that X, Y and Z are not simultaneously hydrogen. n The salts derived from ketoacids of formula I and amines of formula II are new compounds. |