Patent ID: 9266262
Filing Date: 2016-02-23
CPC Classification: B29C,C08K

Claim Text:
1. A method for manufacturing a light transmissive film in which a cured resin layer having a fine concavo-convex structure is formed on a surface of a base material film, comprising: a step of sandwiching an active energy ray-curable composition including a mold dissolving component between a mold having an inversion structure of the fine concavo-convex structure and the base material film; a step of obtaining a light transmissive film in which a cured resin layer having the inversion structure of the mold transferred thereto, is formed on one surface of the base material film; and a step of separating the obtained light transmissive film and the mold, wherein the mold dissolving component is a phosphate ester compound which includes phosphoric acid and satisfies the following condition (a): condition (a): after an aluminum prototype of 50 mm×50 mm×0.3 mm, which is an aluminum based metal prepared by a fabric grinding treatment followed by electrolytic-grinding in a solution mixture of perchloric acid/ethanol (volume ratio=1:4) and mirror-polishing on a rolling trace-free cylindrical aluminum prototype of a diameter of 200 mm and a length of 350 mm having an average crystal grain diameter of 40 μm, which was prepared by a forging treatment on an aluminum ingot having a purity of 99.9%, is anodized in a 0.3 M oxalic acid aqueous solution for 30 minutes under conditions of a direct current of 40 V and a temperature of 16° C., the aluminum prototype having a 3 μm-thick oxide film formed thereon is immersed in a 6 mass % phosphoric acid/1.8 mass % chromic acid mixture aqueous solution for 2 hours, thereby removing the oxide film, and then the aluminum prototype is anodized in a 0.3 M oxalic acid aqueous solution for 30 seconds under conditions of a direct current of 40 V and a temperature of 16° C., and when the obtained aluminum prototype is immersed in the mold dissolving component at 50° C. for 22 hours, the mass of the aluminum prototype is reduced by 0.001% to 3% compared to before immersion, and a value represented by (the concentration of phosphoric acid in an aqueous solution obtained by extracting the mold dissolving component using 50 mL of water per gram of the mold dissolving component expressed by parts per million parts by mass)×(the content of the mold dissolving component in the active energy ray-curable composition expressed by mass percentage) is in a range of 0.1 to 39.