Patent ID: 8045321

Claim:
A resin-coated aluminum alloy sheet material for an aluminum electrolytic capacitor case, comprising a resin layer composed of either an epoxy-based resin or a polyester-based resin and containing wax composed of at least one of polyethylene wax and carnauba wax, wherein: the resin layer has a cross-section thickness falling within a range from at least 2μm to at most 22μm when being cut in a direction perpendicular to a surface of the resin layer; total of lengths of wax particles, which are defined when the wax particles are cut along a straight line of 100μm optionally drawn on the surface of the resin layer, is at least 10μm; a number of the wax particles, which have a cross-sectional shape featured by a major axis extent having a length of at most 80% of the thickness of the resin layer and of at least 0.1μm, and which exist in a cross-sectional area of the resin layer defined by using the straight line of 100μm as a side thereof, falls within a range from at least 3 to at most 50; and a number of the wax particles, which have a cross-sectional shape featured by a major axis extent having a length of more than 80% of the thickness of the resin layer, and which exist in the cross-sectional area of the resin layer defined by using the straight line of 100μm as a side thereof, is less than 10.