| 摘要 |
PROBLEM TO BE SOLVED: To provide a release sheet which can form a through-hole in high dimensional accuracy and high positional accuracy in a resin sheet in which a through-hole is to be formed. SOLUTION: The release sheet is attached provisionally to the resin sheet in which the through-hole is to be formed, used to form the through-hole in the resin sheet in which the through-hole is to be formed, and has a base material film, a first resin layer which is formed on a surface of the base material film opposite to the surface which is attached provisionally to the resin sheet in which the through-hole is to be formed and composed mainly of a resin material, and a second resin layer which is formed on a side of the base material film which is attached provisionally to the resin sheet in which the through-hole is to be formed and composed mainly of a resin material. The softening temperature (A) measured by a thermomechanical analysis (measurement condition: in nitrogen; the temperature rising speed 5°C/min) of the base material film is at least 180°C, and the 10% mass reduction temperature (B) measured by a thermogravimetric analysis (measurement condition: in nitrogen; the temperature rising speed 5°C/min) of the first resin layer is 180-280°C. COPYRIGHT: (C)2011,JPO&INPIT |
