Patent ID: 6114024
Filing Date: 2000-09-05
Classification: B29C,B32B,Y10T

Abstract:
A multilayer breathable film having the of properties of:(i) providing a barrier to microorganisms; and(ii) providing a barrier to blood and bodily fluids;said breathable film comprising at least a five-layer film having as a minimum the following structure:C:A:B:A:C;where B comprises a microporous core layer containing at least one thermoplastic polymer and at least one particulate filler;C comprises an outer monolithic layer containing a hydrophilic polymeric resin capable of absorbing and desorbing moisture and providing a barrier to water and microorganisms, said C layer being substantially free of particulate filler; and,A comprises a microporous adhesive layer for bonding said outer monolithic layers to said microporous core layer, wherein said outer monolithic layers substantially prevent the buildup of particulate filler material on a die during formation of said multilayer breathable film, and wherein said microporous core layer and said microporous adhesive layers contain micropores, said micropores being constructed and arranged to provide the passage of gaseous water but substantially prevent the passage of liquid water.