MULTILAYER BREATHABLE FILM AND A METHOD FOR MAKING A MULTILAYER BREATHABLE FILM.

摘要

The disclosure is directed to provide a method of making a stretched, multilayer breathable film that provides a barrier to microorganisms and provides a barrier to blood and bodily fluids and the film itself. The method involves simultaneously extruding (20) at least a five-layer film from a die having the structure C:A:B:A:C. In this structure, the core layer B is a microporous layer containing at least one thermoplastic polymer and one particulate filler. The outer layers C are monolithic and are composed of a hydrophilic polymer resin that is free of particulate filler. Layers A represent microporous adhesive layers. Following extrusion, stretching (40) of the film is performed. Stretching creates micropores in core layer and adhesive layer. After stretching, the film is slit (50) and wound (60).