Morgan, Lewis & Bockius LLP
Aluminum base die material for stamper, aluminum base die for stamper and stamper
The present invention relates to an aluminum die base material for a stamper having a component composition that contains 0.5% by weight to 3.0% by weight of Mg, the total amount of elements other than Mg, including unavoidable impurities, is 500 ppm or less, and the remainder is composed of Al, and a forged structure in which the average crystal grain size is 1000 μm or less and the surface area ratio of second phase particles is 0.10% or less. According to the present application, a stamper can be provided in which, together with the crystal grain size of the aluminum being refined, the formation of second phase particles is inhibited, surface irregularities attributable to mirrored surface polishing are reduced, and a uniform relief pattern is formed by anodic oxidation treatment.
Mitsubishi Rayon Co., Ltd. Nippon Light Metal Company, Ltd.
C Y B C B
C22C Y10T B29K C25D B29C
inventional additional additional inventional additional
Kota Hisakazu Hiroaki
Shirai Ito Kita