Patent ID: 8609005

Claim:
A method for producing a stretched film comprising an addition polymer consisting of norbornene compounds, which comprises stretching, at least in one direction, a film of: a) the addition polymer consisting of norbornene compounds, and b) an organic compound having a boiling point of not higher than 250° C. in an amount of from 1 to 200% by weight relative to the addition polymer, wherein the stretched film has a linear expansion coefficient of at most 50 ppm/° C.; and wherein the stretched film is a non-crosslinked film; wherein the addition polymer consisting of norbornene compounds has a glass transition temperature of not lower than 200° C., and wherein the addition polymer consisting of norbornene compounds include a repetitive structural unit represented by the following formula (1), wherein R 1 to R 4 each independently represent a hydrogen atom; a functional group containing a heteroatom of Group 15 or 16 of the Periodic Table or a silicon atom; or a hydrocarbon group having from 1 to 20 carbon atoms and optionally having the functional group, wherein R 1 to R 4 may bond to each other to form a ring, and wherein m indicates an integer of 0 or 1 or more.