PERMEABLE FILM, AND METHOD FOR PRODUCING SAME

摘要

The present invention provides a permeable film which has even permeability and which exhibits excellent kinetic properties such as durability, and heat resistant properties such as shape stability at high temperatures. The present invention also provides a method for producing said permeable film. The present invention is a permeable film in which a glass fiber fabric is impregnated with a binder resin, the permeable film being characterized by having the following features: (1) the binder resin covers the entire surface of the glass fiber fabric; and (2) the permeability of the permeable film is 1000 sec/100 cc or less and 1 sec/100 cc or more in Gurley values (JIS standard P8117). The present invention is also a method for producing said permeable film, whereby the permeability of a glass fiber fabric is first eliminated by impregnating the glass fiber fabric that was opened with a binder resin, and then re-opening the glass fiber fabric.