초록 ▼

Improved powder paint compositions providing greater depth variation of metal pigment particles comprise (1) aluminum flakes individually encapsulated in a thin, continuous, thermoplastic, organic film-former containing an ammonium salt selected from tetraalkyl ammonium halides and substituted tetra

Improved powder paint compositions providing greater depth variation of metal pigment particles comprise (1) aluminum flakes individually encapsulated in a thin, continuous, thermoplastic, organic film-former containing an ammonium salt selected from tetraalkyl ammonium halides and substituted tetraalkylammonium halides wherein at least one alkyl radical is replaced with an aryl, phenoxy, or alkoxy radical and (2) a particulate, organic film-former. The encapsulated aluminum flakes are prepared by intimately dispersing the aluminum flakes in a solution of the thermoplastic, organic film-former and the ammonium salt in a volatile solvent and spray drying the resultant dispersion. In the preferred embodiment, the particulate, organic film-former is also a thermoplastic material and, in the most preferred embodiment, it is of the same composition as the coating on the aluminum flakes.

대표청구항 ▼

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

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 point, 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 thermoplastic, organic, film-former per 100 parts by weight aluminum flakes, said thermoplastic, organic, film-former consisting essentially of a thermoplastic, organic, film-former selected from the group consisting of 1. polymers of alpha-beta olefinically unsaturated monomers of which about 51 to 100 weight percent are acrylic monomers and 0 to about 49 weight percent are monovinyl hydrocarbons, 2. polyamides, 3. polyesters, 4. homopolymers of monovinyl hydrocarbons, 5. cellulose acetate, and 6. cellulose butyrate, and containing about 0.05 to about 20 parts by weight of an ammonium salt selected from the group consisting of tetraalkylammonium halides and substituted tetraalkylammonium halides wherein at least one alkyl radical is replaced with an aryl, phenoxy or alkoxy radical per 100 parts by weight of said thermoplastic, organic, film-former, and C. said particulate, organic, film-former is selected from the group consisting of 1. a thermoplastic, particulate, film-former that is a copolymer 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 an epoxy- functional copolymer having average molecular weight (Mn) in the range of about 1500 to about 15,000 and glass transition temperature in the range of about 40°C. to about 90°C. bearing functional groups provided by constituent monomers selected from the group consisting of glycidyl esters of a monoethylenically unsaturated carboxylic acid, C5 -C7 monohydroxy acrylates, C5 -C7 monohydroxy methacrylates and alphabeta olefinically unsaturated amides and wherein at least above 50 weight percent of the constituent monomers are acrylic monomers and the remainder weight percent, if any, of the constituent monomers consists essentially of C8 -C12 monovinyl hydrocarbons, said copolymer being self-crosslinkable or employed in combination with a monomeric or polymeric cross-linking agent that is capable of reacting with said functional groups on said copolymer,