Patent ID: 9556532
Date: 2017-01-31
CPC Classifications: B29C,C25D,G02B

Claim:
1. A method for manufacturing a mold which has a porous alumina layer over its surface, comprising the steps of: (a) providing a mold base which includes a metal base, an inorganic material layer provided on a surface of the metal base, and an aluminum film deposited on the inorganic material layer, the aluminum film having a purity of not less than 99.99 mass %; (b) after step (a), anodizing a surface of the aluminum film to form a porous alumina layer which has a plurality of minute recessed portions; and (c) after step (b), bringing the porous alumina layer into contact with an etching solution to enlarge the plurality of minute recessed portions of the porous alumina layer.