Corrosion inhibitors

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C - Chemistry, Metallurgy

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C

C07C 211/03 (2006.01) C07C 217/08 (2006.01) C07C 229/42 (2006.01) C07C 257/10 (2006.01) C07C 279/00 (2006.01) C07C 323/62 (2006.01) C07D 251/54 (2006.01) C07D 295/03 (2006.01) C08K 5/09 (2006.01) C09D 5/08 (2006.01) C09D 5/44 (2006.01) C09D 201/00 (2006.01)

Patent

CA 2087895

Coating composition comprising: A) an organic film-forming binder; and B) a corrosion-inhibiting amount of a water-insoluble salt of i) a carboxylic acid having the formula (I): Image in which a is 0 or an integer ranging from 1 to 5; m and n, independently, are 0 or an integer ranging from 1 to 10; X1 is O, S or -C(R5)(R6) provided that, if m and n are each 0, then X1 is not O or S; R1, R2, R3, R4, R5 and R6 are the same or different and each is hydrogen, C1-C15 alkyl, C2-C15 alkenyl, C3-C12 cycloalkyl, C2-C15 alkyl interrupted by one or more O-, N- or S-atoms, or each is C6-C10 aryl, C7-C12 aralkyl or C7-C12 aralkenyl each optionally substituted by one to five groups R, or any two of R1 and R2, R3 and R4 or R5 and R6 may form a C3-C12 cycloalkyl ring or a C6 aryl ring; and R is halogen, nitro, cyano, CF3, C1-C15 alkyl, C5-C12 cycloalkyl, C2- C15 alkenyl, C1-C15 halogenoalkyl, C1-C12 alkoxy, C1-C12 thioalkyl, C6-C12 aryl, C6-C10 aryloxy, C7-C12 aralkoxy, C7-C12 alkaryl, CO2H, CO2-C1-C12 alkyl in which the alkyl group is optionally interrupted by one or more O-, N- or S-atoms, CO2-C7-C12 alkaryl, CO2-C6-C12-aryl in which the aryl group is optionally substituted with one or more carboxy groups, -C(=O)H, -C(=O)-C1-C12 alkyl in which the alkyl group is optionally interrupted by one or more O-, N- or S-atoms, -C(=O)-C7-C12 alkaryl, -C(=O)-C6-C12 aryl in which the aryl group is optionally substituted with one or more carboxy groups, NH2, NH-C1-C15 alkyl or N(C1-C15 alkyl)2 groups in which the alkyl groups are optionally interrupted by one or more O-, N- or S-atoms, or any two groups R may form a fused aliphatic or C6 aromatic ring; and ii) a base selected from a) a canon of Group Ib, IIa, IIb, IIIa, IIIb, IVa, IVb, Va, VIa, VIIa or VIIIa of the Periodic Table of Elements, b) an amine of formula II: Image in which X, Y and Z are the same or different and each is hydrogen, C1-C24 alkyl optionally interrupted by one or more O- or N-atoms, C7-C9 phenylalkyl or C7- C9 alkylphenyl, or two of X, Y and Z, together with the N-atom to which they are attached, forms a 5-, 6- or 7- membered heterocyclic residue which optionally contains one or more further O-, N- or S-atoms, and which is optionally substituted by one or more C1-C4 alkyl, amino, hydroxy, carboxy or C1-C4 carboxyalkyl groups, or two or X, Y and Z represent a double bond connected to a carbon atom and, together with the other one of X, Y and Z, form a heterocyclic ring which optionally contains one or more further O-, N- or S-atoms and may be fused to a phenyl ring, provided that X, Y and Z may not be simultaneously hydrogen; c) a guanidine of formula III: R7~N~C(NH2)2 III in which R7 is hydrogen or C1-C15 alkyl; d) an amidine of formula IV: R7~C(=NH)NH2 IV in which R7 has its previous significance; or e) melamine which is optionally substituted with one or more C1-C15 alkyl groups or phenyl groups.

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