Metal container coating compositions comprising an acrylic polymer latex, melamine formaldehyde resin and an phenol formaldehyde resin

A water borne, water dilutable coating composition for wash coat or varnish coat application to metal containers intended for the packaging of beverages and food products comprising a mixture of

• (A) from about 10 to about 90 percent by weight of an acrylic polymer latex containing an acrylamide or methacrylamide polymer component formed from the following monomeric ingredients:
• ______________________________________ INGREDIENT PERCENT BY WT. ______________________________________ (1) Styrene 3-10 percent (2) ethyl acrylate 0-20 percent (3) butyl acrylate 0-20 percent (4) methyl methacrylate 5-8 percent (5) methacrylic acid 3-7 percent (6) C.sub.1 to C.sub.6 -alkyl 0.5-3 percent oxymethyl- acrylamide or methacrylamide ______________________________________
• based upon the total materials added to the acrylic polymer latex component, in a liquid medium selected from the group consisting of water and a mixture of water with an organic liquid solvent to provide from about 30 to 35 percent by weight of nonvolatile materials in said polymer latex component,
• (B) from about 1 to about 50 percent by weight of the total solids in the composition of a melamine/formaldehyde resin,
• (C) from 0.5 to 50 percent by weight of the total solids in the composition of a base treated phenol/formaldehyde source resin composition, which phenol/formaldehyde resin has a viscosity of 20 seconds maximum using a No. 4 Ford cup viscosity test method,
• (D) from about 0.1 to about 10 percent by weight of a coating polymer compatible lubricant uniformly dispersible in the total coating composition,
• (E) from about 0.1 percent to about 5 percent by weight of the total solids in the composition of a defoamer material selected from the group consisting of (1) an alkyl-branched alkynyl diol having from 10 to 20 carbon atoms and (2) aliphatic mineral spirits having C.sub.1 to C.sub.12 -isaparaffinic hydrocarbons,
• said can coating composition containing therein sufficient liquid selected from the group consisting of water and a water/organic liquid solvent mixture to maintain the components (A) to (E) dispersible therein.