Lg Chem, Ltd

Korea Research Institute of Chemical Technology

Cqv Co., Ltd.

Jung-Min Lee

Sung-Ho Chun

Heon Kim

Won-Kook Kim

Sung-Cheol Yoon

Tae-Sun Lim

Sung-Don Hong

Jeong-su Yu

Hye-Young Jung

Dai-Seung Choi

Jeong-Hwan Park

Soon-Yong Jeong

Jeong-Kwon Suh

Chun-Hee Park

Sang-Doo Ahn

Kyung-Lim Paik

In-Seok Hwang

Beom Sik Kim

Sergey Belyaev

Kil-Wan Chang

Kyoung-Hoon Kim

Hee-Jean Lee

Byoung-Kun Jeon

Kwang-Choong Kang

Kwang-Soo Lim

Byung-Ki Choi

Chul Ung Kim

Byung-ki Choi

Kwang Joo Kim

Beom-Seok Kim

Jae-Il Jeong

Choong Kyun Yeom

Dmitry Kravchuk

Kil-wan Chang

Myung-Ho Jung

Yeoun-Kee Park

Si-Wang Kim

Chang-Whan Lim

Jong-An Kim

Jae-Soo Choi

Hang-Kyo Jin

Byung-Ki Park

Sang Bong Oh

Tae-sun Lim

Sung-cheol Yoon

Beom-Jae Lee

Kyung-Jun Han

Jeong-Su Yu

Won-Kook 115-1203 Hwangsil Town 302 Kim

Young-Chul 104-601 Wonchun Jugong Apt Won

Tae-Sun 7-202 Lg Company Housing Apt Lim

Dai-Seung 101-1107 Dairim Durae Apt Choi

Disclosed is a method for manufacturing plate &#x3b1;-alumina pearlescent pigments and nano-metal coating pearlescent pigments with a large aspect ratio, having excellent reflectivity and capable of expressing various colors.

Method for manufacturing plate alpha-alumina pearlescent pigments and nano-metal coating pearlescent pigments with large aspect ratio

A method of removing a residual catalyst metal compound from a polymer solution comprises the steps of: a) mixing a solution in which at least one organic nitrogen compound is dissolved in a polar solvent and the polymer solution to precipitate a chelate compound of the organic nitrogen compounds and the residual catalyst metal compound, b) adding the polar solvent to the solution mixture to dissolve a chelate compound and to precipitate a polymer, and c) filtering the precipitated polymer. After the polymer polymerization is completed, an organic nitrogen compound solution is added to perform a chelate reaction with the residual catalyst metal compound in a solution phase, and the polar solvent is added to precipitate the polymer so that only polymer precipitates are filtered while an additional filtration process in respect to the chelate compound is not performed to easily remove the residual catalyst metal compound.

Method of deashing from polymer solutions

Disclosed is a method for producing a norbornene monomer composition, a norbornene polymer produced using the norbornene monomer composition, an optical film including the norbornene polymer, and a method for producing the norbornene polymer. The method includes reacting a reaction solution that contains cyclopentadiene, dicyclopentadiene, or a mixture of cyclopentadiene and dicyclopentadiene, an acetate compound, and a solvent so that a content of an exo isomer is 50 mol % or more. Variables such as a reaction temperature, a reaction time, a molar ratio between reactants, and addition of a solvent are controlled so that the exo isomer is contained in content of 50 mol % or more. Accordingly, it is possible to industrially produce an acetate norbornene addition polymer by using the acetate norbornene monomer composition containing the exo isomer in content of 50 mol % or more.

Method for preparing norbornene monomer composition, norbornene polymer prepared therefrom, optical film comprising the norbornene polymer, and method for preparing the norbornene polymer

Method for producing norbornene monomer composition, norbornene polymer prepared therefrom, optical film comprising the norbornene polymer, and method for producing the norbornene polymer

Disclosed is a method for preparing a cycloolefin polymer containing polar functional groups, comprising: preparing a catalyst mixture including i) a precatalyst, containing a Group 10 transition metal having a ligand containing oxygen ions bonded to the metal; ii) a first cocatalyst which is an organic compound containing a Group 15 element; and iii) a second cocatalyst which is capable of providing an anion and weakly coordinating to the metal of the precatalyst; and subjecting a monomer solution comprising a norbornene-based compound containing a polar functional group to an addition polymerization reaction in the presence of an organic solvent and the catalyst mixture, at a temperature of 80-200&#xb0; C., the total amount of the organic solvent being 50-800% by weight based on the total weight of the monomer contained in the monomer solution, and the product yield of the polymer being 50% by weight or more based on the total weight of the monomer.

Method for polymerizing cycloolefin polymer containing polar functional groups and electronic devices employing the polymerized cycloolefins

Disclosed is a method for preparing a cycloolefin polymer containing polar functional groups, comprising the steps of: a) preparing a catalyst mixture including i) a precatalyst; ii) a first cocatalyst; and iii) a second cocatalyst; and b) subjecting a monomer solution comprising a norbornene-based compound containing a polar functional group to an addition polymerization reaction in the presence of an organic solvent and the catalyst mixture, wherein the product yield of the prepared polymer is 50% by weight or more based on the total weight of the monomer.

Method for polymerizing cycloolefin polymer containing polar functional groups and electronics devices employing the polymerized cycloolefins

Provided are a vertically aligned liquid crystal display (VA-LCD) with good viewing angle characteristics, which has liquid crystals with negative dielectric anisotropy (&#x394;&#x2208;&#x3c;0). In the VA-LCD, a polynorbornene based polymer film is used as a protection film and/or as a negative C-plate retardation film for an upper polarization plate and/or a lower polarization plate. Therefore, high contrast characteristics for a front view and an oblique angle view are realized and color change for an oblique angle view can be minimized.

Vertically aligned liquid crystal display using polynorbornene based polymer film

The present invention provides a negative C-plate type optical anisotropic film having negative birefringence along the thickness direction. In particular, the present invention provides a film comprising cycloolefin addition polymer, which is prepared by addition polymerizing norbornene-based monomers, a method for preparing the same, and a liquid crystal display comprising the same. The film of the present invention can be used for optical compensation films of a variety of LCD (liquid crystal display) modes because the refractive index alone the thickness direction can be controlled by the kind and amount of functional groups introduced to the cycloolefin addition polymer.

Negative C-plate type optical anisotropic film comprising poly cycloolefin and method for preparing the same

The present invention relates to a unified polarizing plate, which employs, as a protection layer of a polarizing film, a transparent film that can simultaneously function as a negative C-plate and transparent protection layer of a polarizing film and has negative refractive index toward thickness direction, thereby simultaneously performing functions as a negative C-plate for optical compensation and as a polarizing plate, and a method for preparing the same. The unified polarizing plate has superior durability at high temperature and high humidity compared to those employing TAC as a protection layer, and improves wide view angle of liquid crystal display having positive refractive index toward thickness direction, when the liquid crystal display device is ON or OFF.

Unified polarizing plate and method for preparing the same

The present invention relates to a norbornene based addition polymer, and more particularly to an addition polymer of norbornene based monomers containing an ester group. The present invention provides a norbornene-ester based addition polymer having a molecular weight (Mn) larger than 20,000 and comprising a norbornene-ester based monomer comprising more than 50 mol % of exo norbornene-ester monomer as a repeating unit, a method for preparing the same, and an optically anisotropic film comprising the same. The norbornene-ester based addition polymer of the present invention is transparent, has a low dielectric constant, has good thermal stability and strength, leaves no unwanted materials when attached to metals or other polymers, and has good adhesivity, so that it can be used for optical films, retardation films, plastic substrate materials, transparent polymers such as POF or PCB, insulating materials, or insulating electronic devices such as PCB or insulating materials.

Nobonene-ester based addition polymer and method for preparing the same

Process for preparing controlled-released chitosan microcapsule

Manufacturing method of granulated complex molecular sieve composition

An improved layered sodium silicate having a .delta. crystalline structure and a process for preparing it is described. By pulverizing anhydrous sodium silicate into an anhydrous sodium silicate powder, adding a limited mount of water to form a mixture granulating the mixture, and directly calcining the granules, a layered sodium silicate having improved calcium ion binding capacity and magnesium ion binding capacity can be produced.

Process for preparation of layered sodium silicate from anhydrous sodium

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Daejeon, South Korea

Jung-Min Lee