MULTILAYER BREATHABLE FILM AND A METHOD FOR MAKING

专利名称：MULTILAYER BREATHABLE FILM AND A

METHOD FOR MAKING A MULTILAYERBREATHABLE FILM

发明人：FORTE, NICHOLAS, F.申请号：EP96926801申请日：19960801公开号：EP0848663A4公开日：19990818

摘要：Provided is a method of makinga stretched, multilayer breathable film havingthe combination of properties of: (i) providing a barrier to microorganisms; and (ii)providing a barrier to blood and bodily fluids; said method comprising the steps of: (a)simultaneously extruding at least a five-layer film from a die, said five-layer film having asa minimum the following structure: C:A:B:A:C; where B comprises a microporous corelayer containing at least one thremoplastic polymer and at least one particulate filler; Ccomprises an outer monolithic layer containing a hydrophilic polymeric resin capable ofabsorbing and desorbing moisture and providing a barrier to aqueous fluids and

microorganisms, said C layer being substantially free of particulate filler; and A comprisesa microporous adhesive layer for bonding said C layers to said core layer B, wherein saidC layer sustantially prevents the buildup of particulate filler material on said die duringsaid extrusion step; (b) stretching said extruded five-layer film to thereby form

micropores in said microporous core layer and said microporous adhesive layer, whereinsaid stretching step is conducted and said microporous core layer and said microporousadhesive layers have been formulated so as to provide micropores which allow the

passage of gaseous water but substantially prevent the passage of liquid water. Theinvention also relates to a multilayer film.

申请人：KIMBERLEY-CLARK WORLDWIDE, INC.

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