In a powder paint which exclusive of catalysts, antistatic agents, plasticizers, and flow control agents, the same being known and optional additives to powder paints, consists essentially of aluminum flakes, non-metal pigment, and a particulate, organic, film-former, the improvement wherein
- A. said non-metal pigment comprises 0 to about 22 weight percent of said powder paint,
- B. said aluminum flakes comprise about 0.005 to about 25 weight percent of said powder paint and are encapsulated prior to admixture with said particulate, organic, film-former with about 2 to about 200 parts by weight of a continuous coating of a thermosettable, organic, film-former per 100 parts by weight aluminum flakes, said thermosettable, organic, film-former consisting essentially of a copolymer having average molecular weight (M.sub.n) in the range of about 1500 to about 15,000 and glass transition temperature in the range of about 40.degree.C. to about 90.degree.C. bearing functional groups provided by constituent monomers selected from the group consisting of glycidyl esters of a monoethylenically unsaturated carboxylic acid, C.sub.5 -C.sub.7 monohydroxy acrylates, C.sub.5 -C.sub.7 monohydroxy methacrylates and alpha-beta olefinically unsaturated amides and wherein at least above 50 weight percent of the constituent monomers are selected from acrylic monomers and the remainder weight percent, if any, of the constituent monomers consist essentially of C.sub.8 -C.sub.12 monovinyl hydrocarbons, said copolymer being self-crosslinkable or employed in combination with a monomeric or polymeric crosslinking agent that is capable of reacting with said functional groups on said copolymer.
- C. nickel powder is dispersed in said powder paint, the weight ratio of said nickel powder to the encapsulated aluminum flakes being between about 1:4 and about 5:1, and
- D. said particulate, organic film-former is selected from
- 1. a thermoplastic, particulate, film-former that is a polymer of alpha-beta olefinically unsaturated monomers of which about 51 to about 100 weight percent are acrylic monomers and 0 to about 49 weight percent are monovinyl hydrocarbons, and
- 2. thermosettable, particulate, film-formers consisting essentially of a copolymer having average molecular weight (M.sub.n) in the range of about 1500 to about 15,000 and glass transition temperature in the range of about 40.degree.C. to about 90.degree.C., bearing functional groups provided by constituent monomers selected from the group consisting of glycidyl esters of a monoethylenically unsaturated carboxylic acid, C.sub.5 -C.sub.7 monohydroxy acrylates, C.sub.5 -C.sub.7 monohydroxy methacrylates and alpha-beta olefinically unsaturated amides and wherein at least about 50 weight percent of the constituent monomers are selected from acrylic monomers and the remainder weight percent, if any, of the constituent monomers consist essentially of C.sub.8 -C.sub.12 monovinyl hydrocarbons, said copolymer being self-crosslinkable or employed in combination with a monomeric or polymeric cross-linking agent that is capable of reactions with said functional groups on said copolymer.