Abstract: Polymeric film structures incorporating at least one coating comprising a cross-linked EVOH copolymer and coating solutions suitable for use on polymeric films comprising at least one EVOH copolymer and at least one cross-linker are provided. The coated films may be single or multi-layered film structures. The films may also be metallized. The coated films exhibit beneficial water vapor and oxygen transmission rates. The coated films may also exhibit the beneficial barrier characteristics under conditions of high humidity. The coated films are suitable for packaging applications. The coating solutions exhibit beneficial stability characteristics over extended time periods.

Abstract: Methods of producing polyethylene films having a desired water vapor transmission rate (WVTR) are provided. The methods include casting a polyethylene sheet which has a base layer of a polyethylene and a cavitating agent, and at least one layer of a WVTR-controlling material, and subsequently biaxially orienting the sheet to yield a film having the desired WVTR. The base layer has a porous microstructure and a WVTR substantially higher than the desired WVTR.

Abstract: Polyethylene films having desired water vapor transmission rates (WVTR) and methods of producing the same are provided. The methods include adherently superimposing at least one layer of a WVTR-controlling material to a base layer including a polyethylene and a cavitating agent, and subsequently biaxially orienting the composite polyethylene sheet to yield a film having the desired WVTR. The base layer has a porous microstructure and a WVTR substantially higher than the desired WVTR.

Abstract: A porous membrane is provided by biaxially stretching a film of high density polyethylene (HDPE), including particles of an incompatible material. This film has a meshed network of HDPE fibers and striations of layers coplanar with the plane of the film. This film is porous in a direction perpendicular to the plane of the film and has a void content of at least 20%. The porous membrane may have one or more nonporous backing layers. The membrane may be used as filter or battery separator.

Abstract: Methods of producing polyethylene films having a desired water vapor transmission rate (WVTR) are provided. The methods include casting a polyethylene sheet which has a base layer of a polyethylene and a cavitating agent, and at least one layer of a WVTR-controlling material, and subsequently biaxially orienting the sheet to yield a film having the desired WVTR. The base layer has a porous microstructure and a WVTR substantially higher than the desired WVTR.

Abstract: The present invention is directed to biaxially oriented polymeric films. Specifically, the present invention is directed to biaxially oriented polyethylene films having unidirectional tear characteristics in machine direction and method thereof. The film of the present invention consists of (1) a core layer of medium density polyethylene (MDPE) and optionally a cavitating agent; and (2) at least one skin layer on at least one surface of the core layer. The skin layer is also made from a polyethylene. The core and skin layers coextensively adhere to one another and are biaxially oriented in both machine and traverse directions.