Patent ID: 6491973
Filing Date: 2002-12-10
Classification: C08J,C09D,Y10S

Abstract:
A powder coating composition comprising:a particulate component (A) prepared from an epoxy resin prepared from epichlorohydrin and bisphenol having an epoxy equivalent weight of 250 to 2500 and at least one resin from the group consisting of epoxy novolak resins, phenolic resins and melamine resins, or prepared from at least one epoxy resin having an epoxy equivalent weight of 250 to 2500 and at least one resin selected from group consisting of epoxy novolak resins, phenolic resins, and melamine resins, at least one curing component, conventional lacquer auxiliary substances and additives, and optionally, one or more ingredients selected from the group consisting of a pigment and a filler; a particulate component (B) prepared from at least one resin selected from the group consisting of polyester resins, (meth)acrylate resins and modified copolymers, the at least one resin of particulate component (B) differing from the at lest one epoxy resin of particulate component (A), the at least one resin of component (B) having an acid value of 20 to 70, an OH value of 10 to 100, or a combination thereof, at least one curing component, conventional lacquer auxiliary substances and additives, and optionally, one or more ingredients selected from the group consisting of a pigment and a filler, wherein particulate component (A) and particulate component (B) are prepared separately by mixing, extruding, cooling and grinding; and wherein particulate component (A) and particulate component (B) are mixed in a ratio of 1:99 to 50:50, relative to weight, and homogenized by melting in an extruder.