A porous membrane that simultaneously achieves excellent electric performance and excellent mechanical strength, and has skin layers on the opposite sides thereof, the skin layers having same pore characteristics, and a method for manufacturing the same ar...

A method for producing a microporous membrane comprising the steps of: providing an ultrahigh molecular weight polyethylene (UHMWPE); providing a filler; providing a processing plasticizer; mixing UHMWPE, filler and the processing plasticizer together to f...

A polyolefin microporous membrane that may serve as a separator for a lithium ion battery is a single-layer or laminated structure and includes a film that forms a surface layer and contains organosilicone particles.

Producing a stable dispersion of a non-aqueous liquid phase and a dispersed dicarboxylic acid salt, comprises: reacting an aliphatic dicarboxylic acid with a divalent metal salt in an aqueous solution to form a dicarboxylic acid salt; separating and drying...

A porous thermoplastic resin film (15) has micropores formed from a three-dimensional network made of trunk fibrils extending in one direction, and branch fibrils through which trunk fibrils are connected to one another. Density of branch fibrils is higher...

A porous thermoplastic resin film capable of functioning well as a separator of a cell is provided. The porous film is constituted with a thermoplastic resin and a filler, wherein X R defined by the following formula: X R = 25 × T GUR × d 2 /Y is smaller...

The present invention provides a microporous polyolefin membrane of high permeability and novel structure, and also provides a method of producing the same, wherein its average pore size is gradually decreases from at least one membrane surface towards its...

There are provided a porous film comprising a polymer composition comprising (a) a polymer having C=C double bond and an aliphatic ring having 5 to 10 carbon atoms in a main chain thereof; and (b) another resin; a porous film, wherein all or a part of C=C ...

It is an object of the present invention to provide a microporous polyolefin membrane, high in elongation and porosity, low in shrinkage, and capable of improving battery characteristics, safety and productivity, when used for battery separators. The micro...