Aminosilane salts and silanamides of carboxylic acids as corrosi

Details Aminosilane salts and silanamides of carboxylic acids as corrosi Aminosilane salts and silanamides of carboxylic acids as corrosi

1997-12-22

1999-03-09

Green, Anthony

Compositions: coating or plastic

Coating or plastic compositions

Corrosion inhibiting coating composition

106 1441, 106 1443, 25238932, 524188, 556413, 556465, 556466, C09D 508, C23F 1114, C07F 718

Patent

active

058794360

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to coating compositions comprising an organic film-forming binder, preferably a surface-coating material, and aminosilane salts and/or silanamides of carboxylic acids as corrosion inhibitors, to the use thereof in coating compositions for protecting metallic surfaces, and to novel aminosilane salts of carboxylic acids.
The use of alkali metal, alkaline earth metal, transition metal, ammonium and amine salts of carboxylic acids, and of transition metal complexes of ketocarboxylic acids, as corrosion inhibitors in aqueous systems is known and is described, for example, in U.S. Pat. No. 4,909,987, EP-A-0 412 933, EP-A-0 496 555, EP-A-0 554 023 or EP-A-0 619 290.
GB-A-2 279 344 describes carrier-bound ketocarboxylic acids as corrosion inhibitors in coating compositions for protecting metallic surfaces.
U.S. Pat. No. 3 773 607 discloses the preparation and use of silanamides as coupling agents for aglass fibres.
It has now been found that aminosilane salts and/or silanamides of carboxylic acids suppress the oxidation of metals, especially iron, and that at the same time they greatly improve the adhesion of the coating to metal in paints as well. These compounds are therefore suitable in coating compositions and as corrosion inhibitors as well as adhesion promoters.
The present invention therefore provides coating compositions comprising amide (.beta.), both components (.alpha.) and (.beta.) derived from i) a polyacrylic acid, an acrylic acid-maleic acid copolymer, or a carboxylic acid of the formula I ##STR1## in which R.sub.1 is hydrogen, C.sub.1 -C.sub.25 alkyl, C.sub.2 -C.sub.25 alkyl interrupted by oxygen or sulfur; C.sub.2 -C.sub.24 alkenyl, C.sub.4 -C.sub.15 cycloalkyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl and/or carboxyl; C.sub.5 -C.sub.15 cycloalkenyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl and/or carboxyl; C.sub.13 -C.sub.26 polycycloalkyl, C.sub.7 -C.sub.9 phenylalkyl which is unsubstituted or substituted on the phenyl ring by C.sub.1 -C.sub.4 alkyl; --COR.sub.6, a 5- or 6-membered heterocyclic ring which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, halogen or carboxyl; a 5- or 6-membered heterocyclic ring which is benzo-fused and is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, halogen or carboxyl; or else R.sub.1 is a radical of the formula II, III or IV ##STR2## R.sub.2, R.sub.3, R.sub.4 and R.sub.5 independently of one another are hydrogen, hydroxyl, C.sub.1 -C.sub.18 alkoxy, C.sub.2 -C.sub.18 alkoxy which is interrupted by oxygen or sulfur; C.sub.1 -C.sub.25 alkyl, C.sub.2 -C.sub.25 alkyl which is interrupted by oxygen or sulfur; C.sub.2 -C.sub.24 alkenyl, C.sub.5 -C.sub.15 cycloalkyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl; C.sub.5 -C.sub.15 cycloalkenyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 allyl; phenyl or naphthyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl; C.sub.7 -C.sub.9 phenylalkyl which is unsubstituted or substituted on the phenyl ring by C.sub.1 -C.sub.4 alkyl; C.sub.10 -C.sub.12 naphthylalkyl which is unsubstituted or substituted on the naphthyl ring system by C.sub.1 -C.sub.4 alkyl; or are --COR.sub.6, with the proviso that, if one of the radicals R.sub.2, R.sub.3, R.sub.4 and R.sub.5 is hydroxyl, the other radical attached to the same carbon atom is other than hydroxyl; or else R.sub.2 and R.sub.3 or R.sub.4 and R.sub.5, together with the carbon atom to which they are attached, form an unsubstituted or C.sub.1 -C.sub.4 alkyl-substituted C.sub.5 -C.sub.12 cycloalkylidene ring, which is interrupted by oxygen or sulfur; or ##STR3## R.sub.7, R.sub.8, R.sub.9, R.sub.10 and R.sub.11 independently of one another are hydrogen, hydroxyl, halogen, nitro, cyano, CF.sub.3, --COR.sub.6, C.sub.1 -C.sub.25 alkyl, C.sub.2 -C.sub.25 alkyl which is interrupted by oxygen or sulfur; C.sub.1 -C.sub.25 haloalkyl, C.sub.1 -C.sub.18 alkoxy, C.sub.2 -C.sub.18 alkoxy which is interrupted by ox

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