Patent ID: 8268218

Claim:
A process, comprising: contacting a semiconductor substrate with a surface of a release layer (I) of a gas barrier release film by vacuum suction, where said gas barrier release film is in the form of a mold; injecting a sealing resin between said semiconductor substrate and said mold; and releasing said mold from said semiconductor substrate having said sealing resin present thereon, thereby obtaining a semiconductor substrate sealed with the sealing resin, wherein said gas barrier release film comprises: said release layer (I), which is an ethylene/tetrafluoroethylene fluororesin; a plastic support layer (II); and a metal or a metal oxide gas restraint layer (III), present between the release layer (I) and the support layer (II), wherein said gas barrier release film exhibits a xylene gas permeability of at most 5×10 −15 (kmol m/(s·m 2 ·kPa)) at 170° C., and said a surface of said release layer (I) has an arithmetic surface roughness of from 0.15 to 3.5 μm, thereby exhibiting a satin-finish.