| 摘要 |
<p>Provided are a film that has high rigidity and high heat resistance and good releasability from a roughened copper foil surface, which is subjected to surface oxidization or etching treatment with acid, such as a black oxidized copper foil surface and that is suitable as a release film for producing an MLB; and a process for producing the same. A drawn film having, as at least one outermost layer thereof, a layer (A) which comprises a copolymer that is made from 4-methyl-1-pentene and ethylene or an ±-olefin, except 4-methyl-1-penten, having 3 to 20 carbon atoms and that comprises 80% or more by mole of 4-methyl-1-pentene, the thermal coefficient of contraction of the film being 20% or more in the film-drawn direction, or the peel area of the film being 50% or more when the film, together with a copper foil surface subjected to roughening treatment, is subjected to heating and pressing treatment. This film is suitable for producing an MLB and has good releasability from a black oxidized copper foil surface.</p> |
