Treatment of aluminum flake pigment for use in organic coating compositions

A composition, comprising a metal surface modified with at least one compound;

• wherein the compound is of the formula:
• ##STR12## wherein A.sub.1, A.sub.2, A.sub.3, and A.sub.4 are each independently hydroxy,
• alkyl of one to ten carbon atoms,
• alkoxy of one to ten carbon atoms,
• alkoxyalkoxy of two to ten carbon atoms,
• alkanoyloxy of two to ten carbon atoms, or halogen,
• with the proviso that A.sub.1, A.sub.2, and A.sub.3 may not all be alkyl;
• R.sub.1 is a divalent radical selected from straight or branched alkylenes of one to twelve carbon atoms;
• D.sub.1 is either a divalent radical selected from the group consisting of --O--, --NA.sub.5 --, and --S--, or a trivalent radical of the formula ##STR13## wherein A.sub.5, A.sub.6, A.sub.7 and A.sub.8 are each independently hydrogen or alkyl of one to twelve carbon atoms;
• R.sub.2 is hydrogen or a covalent bond with D.sub.1, with the proviso that R.sub.2 is only a covalent bond with D.sub.1 when D.sub.1 is a trivalent radical;
• R.sub.3 is a polymeric backbone;
• D.sub.2 and D.sub.3 are divalent radicals, each independently --O-- or --NA.sub.9 --, wherein A.sub.9 is hydrogen or alkyl of one to twelve carbon atoms;
• R.sub.4 is a divalent radical selected from straight or branched alkylenes of three to thirty carbon atoms;
• R.sub.5 is hydrogen or a mixture of hydrogen and alkyl of one to eight carbon atoms;
• R.sub.6 is an alkyl of one to thirty carbon atoms;
• m and n are integers, each independently being one to one thousand, and
• j and k are integers, each independently being one to fifty.