Patent ID: 7772334

Claim:
A crosslinker for crosslinking a film-forming material comprising: an alkyl or aromatic compound comprising at least two functional groups reactive with a film-forming resin and at least one pendent group comprising a nonionic metal coordinating structure, the nonionic metal coordinating structure having at least two electron-rich functional groups independently selected from the group consisting of oxygen, phosphorous, sulfur, silicon, unsaturated carbon, ester, ketone, ether, and hydroxyl, wherein two of the electron-rich functional groups are in an alpha- or beta-position relative to each other wherein either: (a) the crosslinker having a pendent group is prepared by reacting a resin having at least one group reactive with a nucleophile and a nucleophilic ligand selected from the group consisting of ethyl salicylate, ethylparaben, 4-hydroxy-1-(4-hydroxyphenyl)pentan-2-one, 1-(2-hydroxy-6-methoxyphenyl)ethanone, 1,5-dihydroxyanthraquinone; apigenin; baicalein; 2,2′-bipyridine-3,3′-diol; N,N′-bis(salicylidene)ethylenediamine; 4-(tert-butyldimethylsiloxy)phenol; 2-carbethoxy-5,7-dihydroxy-4′-methoxyisoflavone; 1,8-dihydroxyanthraquinone; 6,7-dihydroxyflavone; chrysophanic acid; 5,7-dihydroxyphenylcoumarin; ellagic acid; emodin; 2,3-dinitrophenol; 2,4-dinitrophenol; fisetin; 7-hydroxy-4-methyl-8-nitrocoumarin; and combinations thereof or (b) the crosslinker having a pendent group is prepared by reacting a resin having at least one group reactive with an electrophile and an electrophilic ligand selected from the group consisting of 3-methyl-1-(oxiran-2-yl)but-3-en-2-one, ethyl phenylglycidate, tert-butyldimethylsilyl glycidyl ether, diethoxy(3-glycidyloxypropyl)methylsilane, diglycidyl-1,2-cyclohexanedicarboxylate, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate, 3,4-epoxytetrahydrothiophene-1,1-dioxide, ethyl-2,3-epoxypropanate, 3-glycidoxypropyldimethoxymethylsilane, glycidyl methacrylate, glycidyl-3-nitrobenzenesulfonate, glycidyl-4-nitrobenzoate, (3-glycidoxypropyl)trimethoxysilane, glycidyl tosylate, and combinations thereof.