Polymer resin film and its production

摘要

In the transparent film of optical application or the support for photographic material produced by a solution film forming method, the polymer resin film on which any coating unevenness does not occur even when a functional layer is coated on the film surface and the manufacturing method for the film are proposed. To be concrete, a polymer resin film produced by the solution film forming method characterized by that the pitch a ÄcmÜ of the periodic thickness unevenness of web longitudinal direction and a thickness unevenness factor d Ä%Ü satisfy formula (1) described below. d -0 .91 a<2>+0 .60 a+1 .01 (on the premise that 0.2< a <3) The manufacturing method using said formula is also proposed.