A film that comprises a thermoplastic composition that contains a continuous phase that includes a polyolefin matrix polymer and a nanoinclusion additive dispersed within the continuous phase in the form of discrete domains is provided. The film is biaxially stretched in a machine direction and cross-machine direction to form a porous network in the composition. The porous network contains nanopores having a maximum cross-sectional dimension of about 800 nanometers or less. At least a portion of the nanopores are oriented in the cross-machine direction so that the axial dimension generally extends in the cross-machine direction and the cross-sectional dimension generally extends in the machine direction.

A method for manufacturing a polyolefin separator, including forming a sheet including a polyolefin resin and a plasticizer; stretching the sheet E.sub.1 times in a longitudinal direction at a temperature of T.sub.1, followed by stretching the sheet E.sub.2 times in a transverse direction at a temperature of T.sub.2, wherein T.sub.1<115° C., T.sub.2<115° C., and T.sub.2≧T.sub.1, and E.sub.1×E.sub.2=55 to 80, E.sub.1≧7, and E.sub.2≧7; and extracting the plasticizer from the stretched sheet.

A biaxially oriented polyester film for molding, wherein the film lengthwise-direction and widthwise-direction storage elastic moduli at 100° C. are each greater than or equal to 100 MPa and less than or equal to 1000 MPa, the film lengthwise-direction and width-wise direction storage elastic moduli at 180° C. are each greater than or equal to 41 MPa and less than or equal to 400 MPa, and the stresses at the time of 100% elongation (F100 values) in the film lengthwise direction and width direction at 150° C. are each greater than or equal to 5 MPa and less than or equal to 60 MPa.

Composition and method for making a multi-layer bio-based film having one or more cavitated layers. In one aspect, the multilayer flexible film has polylactic acid, an inorganic filler, and a cavitation stabilizer making up at least one film layer. In one aspect, the barrier web has a cavitated bio-based film layer. In another aspect, the print web has a cavitated bio-based film layer.

The present invention relates to a new biaxially oriented polypropylene (BOPP) film, a process for the preparation of such film as well as the use of a polypropylene for the preparation of such film and an article comprising such film.

A multilayered stretched polyamide film which is biaxially stretched, and comprises three layers composed of a polyamide resin composition and comprising layer B as an easily adhesive layer, layer A as a base layer, and layer C as an easily slippery layer in this order, wherein the film satisfies the following (1) to (4); (1) the layer A contains 50 to 90% by mass of polyamide 6 and 10 to 50% by mass of a polyamide 6 copolymer in which a ratio of a copolymerization component in the copolymer is 3 to 35% by mass; (2) the layer B contains 0 to 40% by mass of polyamide 6 and 60 to 100% by mass of the polyamide 6 copolymer in which a ratio of the copolymerization component in the copolymer is 3 to 35% by mass; (3) the layer C contains 70% by mass or more of polyamide 6 and 0.05 to 1% by mass of fine particles having an average diameter of 0.1 to 10 μm; (4) the film has tensile strength at break of 150 MPa or more both in MD direction and TD direction; and (5) the film has laminate strength of 3.3 N/15 mm or more.

The invention provides a biaxially stretched multilayer polyamide resin film having 8 or more layers in total and using a same resin composition for 80% based on the ratio of the number of the layers. The film is stretched 2.5 to 5.0 times in the longitudinal direction of the film and has an in-plane orientation coefficient (ΔP) of 0.057 to 0.07 and a strain of 0.1 to 2.0% after boiling treatment.

Disclosed are compositions, methods and uses for thin multi-layered films that may include a metallizable skin layer that include polyethylene polymer(s), wherein the metallizable skin layer may be treated one or more times. The multi-layered films include a core layer and a sealant layer, wherein each of these layers includes metallocene-catalyzed, linear, low-density polyethylene. The core layer is located between the metallizable skin layer and the sealant layer. These films may include one or more additives in any of the layers and/or include one or more tie layers. The multi-layered films may be biaxially oriented, have a haze equal to or below 5%, and have an elastic modulus equal to or below 350 N/mm.sup.2. The multi-layered films may also include a metallized layer on the metallizable skin layer, a coated layer on the metallizable skin layer, and/or be laminated to a polyethylene-based polymer, such as polyethylene terephthalate.

At least a selected microporous membrane is made by a dry-stretch process and has substantially round shaped pores and a ratio of machine direction tensile strength to transverse direction tensile strength in the range of 0.5 to 6.0. The method of making the foregoing microporous membrane may include the steps of: extruding a polymer into a nonporous precursor, and biaxially stretching the nonporous precursor, the biaxial stretching including a machine direction stretching and a transverse direction stretching, the transverse direction including a simultaneous controlled machine direction relax. At least selected embodiments of the invention may be directed to biaxially oriented porous membranes, composites including biaxially oriented porous membranes, biaxially oriented microporous membranes, biaxially oriented macroporous membranes, battery separators, filtration media, humidity control media, flat sheet membranes, liquid retention media, and the like, related methods, methods of manufacture, methods of use, and the like.

The present invention relates to a polyester film and a preparation method thereof. The polyester film is formed of a polyester resin having a specific content of isosorbide and diethylene glycol introduced therein, containing a low content of oligomer, and exhibiting a specific intrinsic viscosity, thereby exhibiting excellent mechanical properties, heat resistance and chemical resistance, and good heat sealability.