Disclosed herein is a breathable film and a breathable, cloth-like film/nonwoven composite made from the breathable film which is stretch-thinned and bonded to a fibrous polyolefin nonwoven web. Certain thermoplastic films such as, for example, linear low density polyethylene films are difficult to thermally bond to, for example, polypropylene nonwoven webs due to the incompatibility of the two polymers. The present invention incorporates a bonding agent into one or both of the two layers thereby making it easier to thermally bond the two layers together. Processes for forming the various composite are also disclosed.

Breathable, cloth-like film/nonwoven composite

A microfluidic device having integrated components for conducting chemical operations. Depending upon the desired application, the components include electrodes for manipulating charged entities, heaters, electrochemical detectors, sensors for temperature, pH, fluid flow, and other useful components. The device may be fabricated from a plastic substrate such as, for example, a substantially saturated norbornene based polymer. The components are integrated into the device by adhering an electrically conductive film to the substrate. The film may be made of metal or an electrically conducting ink and is applied to the device through metal deposition, printing, or other methods for applying films. Methods for reducing bubble formation during electrokinetic separation and methods for heating material in a microfluidic device are also disclosed.

Microfluidic chip having integrated electrodes

The present invention relates to a breathable laminate including an oriented microporous elastomeric film and at least one support layer bonded to the film. The present invention also relates to a process for forming the breathable laminate including the step of stretching a filled film to produce a microporous film before bonding it to a support.

Microporous elastomeric film/nonwoven breathable laminate and method for making the same

Disclosed herein is a bulk-stretched pillowed laminate of two or more layers in which at least one of the layers is stretched before other layers are attached to it. In one execution, a thermoplastic film is stretched until it permanently deforms. Then, while still in a stretched state, a nonwoven web is laminated to the film and the resultant composite is allowed to relax slightly causing the nonwoven layer to gather and pucker, which in turn gives the composite a thicker and bulkier feel and appearance. The material of the present invention, while having a wide variety of uses, is particularly well-suited for use as an outercover for personal care absorbent articles, including diapers, training pants and sanitary napkins.

Stretch-pillowed, bulked laminate

A breathable polyolefin film is prepared by melt embossing a highly filled polyolefin film to impose a pattern of different film thickness therein and by stretching the melt embossed film to impart greater permeability in the areas of reduced thickness in comparison to the areas of greater thickness.

Breathable films prepared from melt embossed polyolefin/filler precursor films

A process for producing a porous film or sheet, which comprises melt-molding a composition prepared by compounding 100 parts by weight of a polyolefin resin with 25 to 400 parts by weight of a filler and 1 to 100 parts by weight of a liquid or waxy hydrocarbon polymer into film or sheet, and stretching the resulting film or sheet.

Process for producing porous film or sheet

PURPOSE: To produce the titled flexible film excellent in moisture and gas permeability, by melt-molding a composition produced by mixing a polyolefin resin with a filler and liquid polyisoprene rubber and stretching the resulting film CONSTITUTION: A porous film or sheet is produced by melt-molding a composition prepared by mixing a polyolefin resin (eg, high-density PE, PP, linear low- density PE) with a filler (eg, silica, TiO 2 , wood powder, pulp powder) and liquid polyisoprene rubber, and uniaxially or biaxially stretching the resulting film or sheet Because of the open-cellular structure, the moisture permeability and gas permeability of the film or sheet are excellent In case of a uniaxially stretched product, the balance between the longitudinal and lateral properties is good, and particularly its lateral tear resistance is good In case of a biaxially stretched product, anisotropy is low Both uniaxially and biaxially stretched products have good flexibility and can be applied to heat sealing and shrink package and have a feature that they can be burned easily without evolving harmful gases COPYRIGHT: (C)1983,JPO&Japio

Production of porous film or sheet

PURPOSE:To obtain a porous film or sheet having good property balance with respect to anisotropy, surface strength, etc., for both mono- and biaxially stretched products by using a raw material obtained by adding a specific compound to a polyolefinic resin. CONSTITUTION:A resin composition, obtained by adding a filler (B) (talc preferably) and a polyhydroxy saturated hydrocarbon (C) (of a number average molecular weight of 500-20,000 preferably) to a polyolefinic resin (A) (high-density polyethylene preferably), is melted and molded into a film or sheet. The film or sheet thus obtained is stretched to obtain an objective film or sheet. In this case, 100pts.wt. a polyolefin resin (A) is preferably mixed with 25-400pts.wt. the component (B) and 1-100pts.wt. the component (C). EFFECT:Both mono- and bi-axially stretched products are good in moisture permeability, weather proofness, heat resistance, etc., as well as having a high flexibility.

Masahiro Morita

Papers

Process for producing porous film or sheet

Production of porous film or sheet

Manufacture of porous film or sheet