| 摘要 |
A process for producing a cycloolefin resin film which comprises: a step in which a cycloolefin resin is melt-extruded at an extrusion temperature of 230-260° C. and a melt viscosity of 500-3,000 Pa·s into a film through a die; a step in which the melt-extruded film is cast; a step in which the cast film is wound up; and a step in which the film which has been wound is unwound and then stretched in the machine and/or transverse direction to cause retardation. The process is characterized by including the step of molecular orientation before the film winding step.
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