Lg Chem, Ltd

Lg Chemical Co., Ltd.

Lg Chemical Ltd.

Shengyi Technology Co., Ltd.

Heon-Sik Song

You-Jin Kyung

Soon-Yong Park

Sang-Young Lee

Byeong-In Ahn

Bi-Oh Ryu

Soon-Ho Ahn

Hyung-Keun Lee

Hyang-Mok Lee

Seung-Jin Lee

Jin-Yeon Cho

Hyun-Hang Yong

Joo-Eun Ko

Bong-Tae Kim

Won-Sik Bae

Kyung-Hwan Yoon

Jung-Jin Shim

Kyoung-Min Kim

Byung-Nam Kim

Joo-Sung Lee

Cheon-Il Park

Kwang-Joo Lee

Byoung Jun Mun

Myung-Man Kim

Joong Hoon Lee

Sung Ho Hwang

Sei Jung Park

Hee-Jung Kim

Seung-Yup Lee

A-Young Lee

Yong-Jun Park

Sung-Jae Han

Joo-eun Ko

Se-myung Jang

Sung-Gap Im

Jung-Ho Lim

Se-Myung Jang

Hyun-Ah Park

Jung-Il Yoon

Byeong-In; Ahn

A crosslinked polyolefin separator which has gels with a longer side length of 50 &#x3bc;m or more in a number ranging from 0 to 3 per 1 mof the separator, and shows a standard deviation of absorbance ratio between the center of the separator and the side thereof ranging from 0.01 to 0.5 is provided. A method for manufacturing the crosslinked polyolefin separator is also provided. The method includes (S1) preparing a polyolefin porous membranes, and (S2) applying a coating solution containing an initiator and alkoxy group-containing vinylsilane onto at least one surface of the porous membrane. The coating solution can permeate even to the inside of exposed pores. Thus, it is possible to provide a crosslinked polyolefin separator in which silane crosslinking occurs uniformly even inside of the pores.

Crosslinked polyolefin separator and manufacturing method therefor

A method for manufacturing a crosslinked polyolefin separator, including the steps of: (S1) introducing polyolefin having a weight average molecular weight of 200,000-1,000,000, a first diluting agent, alkoxysilane containing a carbon-carbon double bonded group, an initiator and a crosslinking catalyst to an extruder; (S2) introducing a second diluting agent to the extruder, followed by mixing, to carry out reactive extrusion of a silane-grafted polyolefin composition; (S3) molding and orienting the reactive extruded silane-grafted polyolefin composition in a form of a sheet; (S4) extracting the first diluting agent and the second diluting agent from the oriented sheet to obtain a silane-grafted polyolefin porous membrane; (S5) thermally fixing the porous membrane; and (S6) crosslinking the porous membrane in the presence of water and a crosslinked polyolefin separator are provided. According to the method, it is possible to provide a separator which shows a decrease in intensive silane crosslinking on the surface thereof.

Cross-linked polyolefin separator and manufacturing method for same

The optical film according to the present invention uses polymethylmethacrylate that does not comprise cyclic monomers, but has excellent dimensional stability and optical properties, and thus, can be usefully used as a protection film of a polarization plate.

Optical film and polarization plate comprising the same

The resin composition for an optical material according to the present invention has features that it can implement a low retardation value during the preparation of an optical film, by using a polycarbonate composition satisfying a specific condition as a retardation-adjusting agent while using polymethyl methacrylate not containing a monomer having a cyclic structure at the main chain of the polymer.

Resin composition for optical material and optical film comprising the same

The present disclosure provides a separator for an electrochemical device, comprising: a porous polymer film; and a porous coating layer formed on one or both surfaces of the porous polymer film and comprising at least one of inorganic particles and organic particles, and a binder polymer, wherein fibrils in the surface of the porous polymer film are entangled with the particles in the porous coating layer in the contact surface between the porous polymer film and the porous coating layer, and the separator has an air permeability of 100 to 800 sec/100 cc, an electrical resistance of 0.5 to 1.5&#x3a9;, and a heat-shrinkage rate of 8% or less in each of machine and transverse directions, and an electrochemical device having the same.

Separator for electrochemical device

A method of manufacturing a separator for an electrochemical device according to an exemplary embodiment of the present disclosure includes extruding a resin composition including polyolefin and a diluent, stretching the extruded resin composition to obtain a polyolefin film, extracting the diluent from the obtained polyolefin film to obtain a porous polyolefin film, coating a slurry for forming a porous coating layer on at least one surface of the porous polyolefin film, and heat setting the porous polyolefin film coated with the slurry to obtain a composite separator with a porous coating layer.

Method of manufacturing separator for electrochemical device and separator for electrochemical device manufactured thereby

Disclosed is a separator for an electrochemical device including a porous polymer film, and a porous coating layer including at least one type of particles of inorganic particles and organic particles and binder polymer, the porous coating layer formed on one surface or both surfaces of the porous polymer film, wherein the porous polymer film has a structure in which multiple fibrils arranged parallel to the surface of the film are stacked in layers, and the fibrils are bound to each other to form a lamellar structure with a size from 130 to 200 nm and tortuosity of the porous polymer film is from 1.60 to 1.90, and an electrochemical device comprising the same.

Disclosed is a method of preparing a crosslinked polyolefin separator including preparing a silane grafted polyolefin solution using a polyolefin having a weight average molecular weight higher than or equal to 200,000, a diluent, an alkoxy group containing vinylsilane, and an initiator, forming the silane grafted polyolefin solution in a sheet shape and stretching, extracting the diluent from the stretched sheet to produce a porous membrane, and crosslinking the porous membrane in the presence of water, and a crosslinked polyolefin separator.

Crosslinked polyolefin separator and method of preparing the same

Disclosed is a separator for an electrochemical device including a porous polymer film, and a porous coating layer including at least one type of particles of inorganic particles and organic particles and binder polymer, the porous coating layer formed on one surface or both surfaces of the porous polymer film, wherein the porous polymer film has a structure in which multiple fibrils arranged parallel to the surface of the film are stacked in layers, and a diameter of the fibril disposed at the side of one surface of the film where the porous coating layer is formed is smaller than a diameter of the fibril disposed at a central part in a thickness-wise direction of the film, and an electrochemical device comprising the same.

The present invention discloses a method for preparing a microporous polyolefin film comprising: a step of injecting a composition comprising polyolefin 30 to 60 wt % and a diluent mixture comprising a diluent, which can make liquid-liquid phase separation with the polyolefin thermodynamically 40 to 70 wt %, into an extruding machine, and melting and kneading thereof to prepare a single phase melt; and a step of extruding the melt while conducting liquid-liquid phase separation by passing through a section having the temperature below the liquid-liquid phase separation temperature and forming thereof in the form of a sheet, and a microporous polyolefin film prepared according to the method.

Method for preparing microporous polyolefin film by thermally-induced phase separation method

The present invention discloses a method for preparing a microporous polyolefin film comprising: a step of injecting a composition comprising polyolefin 30 to 60 wt % and a diluent, which can make liquid-liquid phase separation with the polyolefin thermodynamically 40 to 70 wt %, into an extruding machine, and melting and kneading thereof to prepare a single phase melt; and a step of extruding the melt while conducting liquid-liquid phase separation by passing through a section having the temperature below the liquid-liquid phase separation temperature and forming thereof in the form of a sheet, and a microporous polyolefin film prepared according to the method.

The present invention relates to a composition for preparing a separator for an electrochemical device, a method preparing a separator for an electrochemical device, and an electrochemical device having a separator prepared therefrom, more particularly, a composition for preparing a separator for an electrochemical device, comprising a polyolefin, a first diluent, and a second diluent, wherein an interaction energy between the first diluent and the second diluent is in the range of 2 to 3.5 cal/cm, a method preparing a separator for an electrochemical device using the composition, and an electrochemical device having a separator prepared therefrom. In accordance with the present invention, the pore size of a polyolefin separator can be suitably controlled into a size desired by a user, and the high-temperature stability and mechanical property of the separator can be remarkably improved, thereby enhancing the life time and stability of an electrochemical device having the same.

Composition for preparing separator, method for preparing separator, and electrochemical device having separator prepared therefrom

The present invention provides a multi-component composite film comprising a) polymer support layer, and b) porous gellable polymer layer which is formed on one side or both sides of the support layer of a), wherein the support film of a) and the gellable polymer layer of b) are unified without the interface, a method for preparing the same, and a polymer electrolyte system applied the same.

Multi-component composite film method for preparing the same

The present invention relates to a polyimide photosensitive resin composition that is capable of being developed by an alkali aqueous solution, and a dry film that is produced by the same, and more particularly to a photosensitive resin composition which comprises a) a polyamic acid, b) two or more (meth)acrylate&#x2014;based compounds that include one or more double bonds between carbons, c) a photopolymerization initiator, d) a phosphorus&#x2014;based flame retardant, and e) an organic solvent, and a dry film that is produced by the same.

Alkali developable photosensitive resin composition and dry film manufactured by the same

The present invention provides a metallic laminate and a method for preparing the same. The metallic laminate includes a metal layer, and at least one polymide resin layer. The polymide resin layer has a modulus of elasticity of 70 Mpa at 400&#xb0; C.

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Daejeon, South Korea

Heon-Sik Song