Release film and process for producing the film

Abstract

A release film comprising a releasing agent layer which is disposed on at least one of faces of a substrate film and has a hardness of 0.07 GPa or smaller as measured in accordance with a nano indentation test, wherein peeling force has an average value of 100 mN/20 mm or greater and stays within ±7% of the average value when the release film having a width of 20 mm and a length of 150 mm is peeled from a pressure sensitive adhesive layer at an angle of 180° with respect to the face of the adhesive layer at a speed of 0.3 m/minute in measurement of the peeling force. When the release film is peeled from the face of the adhesive layer of a pressure sensitive adhesive product, striation on the surface of the pressure sensitive adhesive layer can be prevented by suppressing zipping.

Dependencies are inferred from the claim text.