Metallic tone powder coating composition
AssigneeMitsui Toatsu Kagaku Kabushiki Kaisha (Mitsui Toatsu Chem., Inc.)
InventorsSadao Kobayashi, Hiroshi Ozawa, Nobuki Kobayashi
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Abstract
A metallic tone powder coating composition of acrylic resin series which prises a polymer-capsulated metal powder composite material wherein a vinyl monomer is chemically combined with a powder of a metal such as aluminum and a copolymer having a glass transition temperature of at least 20.degree. C wherein the sum of an acrylic ester and a methacrylic ester is at least 30% by weight of the total monomer constituting the copolymer. This powder coating composition provides a coating film having excellent weather-resistance and beautiful appearance and is suited for use in electrostatic powder spraying.
Claims8
A powdery metallic powder-acrylic resin coating composition comprising a mixture of (a) solid powder particles of vinyl copolymer having a glass transition point of at least 20.degree. C and wherein an acrylic ester and a methacrylic ester monomer together constituting at least 30% by weight of the total monomers of said copolymer, and (b) for each about 100 parts by weight of said copolymer particles about 0.1-50 parts by weight of solid particles of a polymer-encapsulated metal powder obtained by activating a metallic powder by treatment with (1) an organic or mineral acid followed by neutralization of the thus-treated powder with an alkali, or (2) an aqueous solution of phosphoric acid;
- and subjecting the activated metallic powder to an in situ polymerization in an aqueous medium of at least one vinyl monomer in the presence of a radical polymerization initiator, the amount of such vinyl monomer being such as to form about 0.2 - 20 parts by weight of said encapsulating polymer per 100 parts of said metallic powder.
Dependencies are inferred from the claim text.