Novel coating compositions

DETAILED DESCRIPTION I claim: 1.
An improved aqueous, resinous coating composition comprising: (a) an acidic resin having an acid number of from 30 to 400, said resins being derived from acids selected from the class consisting of rosin, fatty acids of from 4 to 22 carbon atoms, monobasic acids, dibasic acids, polybasic acids, and esters and polyesters of these acidic materials, and combinations thereof; (b) a complexing agent formed of: (1) a method having a coordination value in excess of its valence, selected from the group consisting of zinc, zirconium, cobalt, and nickel; (2) from 0.
9 to 6 moles, per mole of metal, of a polyamine selected from the class consisting of polyalkylene polyamines having the formula: NHR'[(CHR).
sub.
a NH].
sub.
n R', where each R and R' is individually selected from the class consisting of hydrogen and methyl, a is from 2 to 3, and n is from 2 to 5; with from 0 to 55 percent of the polyalkylene polyamine being replaced with a co-hydrocarbon amine having an amine equivalent weight of from 35 to 120; and (3) from 0 to 1 equivalent of an acid modifier for each 0.
25 to 2 moles of the polyamine of (2), said modifying acid being selected from the class consisting of monobasic acids having from 6 to 18 carbon atoms, dibasic acids having from 4 to 12 carbon atoms, aromatic acids, and polymerized C.
sub.
18 fatty acids; and (c) Sufficient ammonia to provide a pH of from about 7.
3 to 10.
0.
2.
The coating composition of claim 1 wherein the acidic resin is the Diels-Alder reaction product of rosin with an .
alpha.
,.
beta.
-unsaturated olefinic dicarboxylic acid or anhydride.
3.
The coating composition of claim 2 wherein the .
alpha.
,.
beta.
-unsaturated olefinic dicarboxylic material has from 4 to 6 carbon atoms.
4.
The coating composition of claim 3 wherein the acid is selected from the class consisting of maleic, fumaric, itaconic, anhydrides of such acids, and mixtures of such anhydrides and acids.
5.
The coating composition of claim 4 having, in addition, at least one acid selected from the class consisting of phthalic, isophthalic, terephthalic, tetrahydrophthalic, benzoic, succinic, adipic, sebacic, and anhydrides of such acids