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AssigneeToyo Kohan Co., Ltd.
InventorsMasao Komai, Ayumu Taniguchi, Keiichi Shimizu, Jun-ichi Tanabe
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The present invention aims to offer thermoplastic resin coated aluminum alloy sheet having excellent adhesion after forming, wherein the laminated thermoplastic resin layer will not peel off even when subjected to such severe forming as drawing, followed by stretch-forming, further followed by ironing. In order to achieve this, aluminum alloy sheet is treated with alkali solution by dipping into or spraying alkali solution, rinsed, treated with acid solution by dipping into or spraying acid solution so as to obtain a specific surface condition, and further laminated with thermoplastic resin with or without adhesive on both sides of the aluminum alloy sheet.
A thermoplastic polyester resin covered aluminum alloy sheet wherein a thermoplastic polyester resin having a thickness of 5 to 50 microns is laminated on at least one side of an aluminum alloy sheet which is treated by alkali aqueous solution followed by treatment with an acid aqueous solution wherein the specific area increase rate of the aluminum alloy is 3 to 30% and wherein the specific surface area is provided by minute pores formed on the aluminum alloy sheet, the diameter of the pores being in the range of 50 to 3000 nm, the maximum depth of the pores being 1000 nm or less, and the duty area rate being in the range of 10 to 80%.
Dependencies are inferred from the claim text.