| 摘要 |
PROBLEM TO BE SOLVED: To obtain a release film having a release layer reduced in the content of impurities and suppressing the transfer of impurities in the film to be surface of the release layer by applying specific cured matter to the single surface of a polyethylene-2,6-naphthalate film and providing a silicone release layer having a specific residual adhesion ratio thereon. SOLUTION: An ethanol soln. of Si(OC2 H5 )4 is applied to at least the single surface of a polyethylene-2,6-naphthalate film and the coating layer is heated to 120-210 deg.C for 10-60sec not only to be dried by removing a solvent but also to be crosslinked and cured to form a primer layer of which the wall thickness is set to 0.02-2μm. Further, a silicone release layer of which the residual adhesion ratio is 95% or more is provided on the primer layer. As a curable silicone resin to be used, any reaction type one, for example, a condensation reaction type one, an addition reaction type one, an ultraviolet or electron beam curing type one can be used alone or in combination of two or more ones.
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