Lg Chem, Ltd

Sung-Cheol Yoon

Sung-Ho Chun

Heon Kim

Won-Kook Kim

Tae-Sun Lim

Jung-Min Lee

Seung-young Park

In-Su Lee

Jun-Seok Ko

Kyoung-Hoon Kim

Soo-Young Choi

Do-Yong Shim

Seung Young Park

In-Seok Hwang

Dai-Seung Choi

Sung-Ho Park

Seong-woo Kim

Jeong-su Yu

Kyung-Lim Paik

Sang-Doo Ahn

Sung-Don Hong

Jong-Ku Lee

Ho-yeul Choi

Hye-Young Jung

Young-Whan Park

Jungmin Lee

Jung-Min Sohn

Beom-Seok Kim

Taesun Lim

Byoung-Yun Kim

Seong-Woo Kim

Sung-Ho Chung

Seung-Young Park

Jeong-Su Yu

Jung-Eun Kim

Il-Gu Jung

Young-Keun Chung

Tae-Sun 3-410 Lg Chemical Sataek Lim

Won-Kook 115-1203 Hwangsil Town Kim

Heon 2-308 Lg Chemical Employee's Apt Kim

Kyoung-Hoon 6-303 Lg Chemical Employee's Apt Kim

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

The present invention relates to an elastic terpolymer which can satisfy excellent processability and elasticity (flexibility) at the same time, and a preparation method thereof. The elastic terpolymer is a copolymer of 40 to 70 weight % of ethylene, 15 to 55 weight % of a C-Calpha-olefin, and 0.5 to 20 weight % of a diene obtained in the presence of a group 4 transition metal catalyst, of which i) the weight average molecular weight measured by GPC is 100,000 to 500,000, and ii) &#x394; tan &#x3b4;, the difference between the tan &#x3b4; values at the angular frequencies of 0.2 rad/s and 100.0 rad/s, is 0.5 or less that is measured at 100&#xb0; C. by using a rubber process analyzer.

Elastic terpolymer including diene group and preparation method thereof

The present invention relates to a method of preparing an ethylene/alpha-olefin/diene-based elastic copolymer having high viscosity and a high molecular weight, in which energy efficiency of the entire process is optimized. The method of preparing the elastic copolymer includes the steps of: copolymerizing an ethylene/alpha-olefin/diene-based elastic copolymer; and separating and removing the solvent and unreacted monomers from the polymer solution and recovering the elastic copolymer, by sequentially using a gas-liquid separator and a stripper in the purification of the solvent and unreacted monomers.

Method of preparing elastic terpolymer

The present invention relates to an elastic terpolymer that can acquire good mechanical properties and elasticity (flexibility) at the same time, and a preparation method thereof. The elastic terpolymer, which is a copolymer of 40 to 70 wt % of ethylene, 15 to 55 wt % of a C-Calpha-olefin, and 0.5 to 20 wt % of a diene as obtained in the presence of a group 4 transition metal catalyst, satisfies that: (i) the weight average molecular weight measured by GPC is 100,000 to 500,000; and (ii) the ethylene content x (wt %) and the crystallization enthalpy y (&#x394;HcJ/g) of the copolymer measured by DSC satisfy a defined relational expression.

Elastic terpolymer and preparation method thereof

The present invention is directed to an organometallic complex and a catalyst composition capable of producing polylactide resins with improved properties at a higher conversion rate, a method of producing the organometallic complex, polylactide resins having enhanced hydrolysis resistance and heat resistance together with superior mechanical properties, a preparation process therefor, and polylactide resin compositions including the same.

Polylactide resin and preparation method thereof

The present invention relates to an elastic terpolymer which can satisfy excellent processability and elasticity (flexibility) at the same time, and a preparation method thereof. The elastic terpolymer is a copolymer of 40 to 70 weight % of ethylene, 15 to 55 weight % of a C-Calpha-olefin, and 0.5 to 20 weight % of a diene obtained in the presence of a group 4 transition metal catalyst, of which i) the weight average molecular weight measured by GPC is 100,000 to 500,000, and ii) the Mooney viscosity (ML) and the Mooney relaxation area (MLR) measured by a Mooney viscometer (1+4+2 {circle around (a)}125&#xb0; C.) can satisfy a specific relation.

The present invention relates to an elastic terpolymer that can acquire good mechanical properties and elasticity (flexibility) at the same time, and a preparation method thereof. The elastic terpolymer, which is a copolymer comprising 40 to 70 wt % of ethylene, 20 to 50 wt % of a C-Calpha-olefin, and 2 to 20 wt % of a diene as obtained in the presence of a catalyst comprising a vanadium compound, satisfies that: (i) the weight average molecular weight measured by GPC is 100,000 to 500,000; and (ii) in the monomer distribution of the copolymer determined byC NMR analysis, K given by a defined Equation 1 is 0.01 or less.

The present invention relates to a polylactide resin having excellent heat resistance, a preparation method thereof, and a polylactide resin composition including the same. The polylactide resin is characterized by high polymerization activity owing to an organic coordinated metal catalyst even though it has a low catalyst content, and a molecular weight reduction due to thermal decomposition at high temperature and a rate of thermal decomposition including depolymerization are greatly suppressed by a low catalyst content and a low resin acidity, and thus provided is the polylactide resin having superior heat resistance.

Polylactide resin having excellent heat resistance and preparation method thereof

The present invention relates to a packaging film including a lactide copolymer having no problem of pollution or toxicity while having good flexibility in addition to excellent properties such as mechanical properties, transparency, and processability, and preferably being applicable to food packaging. The packaging film includes a lactide copolymer including two or more specific block copolymerized repeating units that the hard segments of polylactide repeating units are connected to both ends of the soft segments of polyether polyol repeating unit, wherein the block copolymerized repeating units are connected to each other through the intermediation of urethane connecting groups derived from polyvalent isocyanate compound of which the average equivalent of isocyanate group per a molecule is more than 2 and less than 3.

Packaging film including a lactide copolymer

The present invention relates to a lactide copolymer having good flexibility in addition to excellent properties such as mechanical properties and processability and preferably being applicable as a packaging material, a preparation method thereof, and a resin composition including the same. The lactide copolymer includes two or more specific block copolymerized repeating units that the hard segments of polylactide repeating units are connected to both ends of the soft segments of polyether polyol repeating unit, and the block copolymerized repeating units are connected to each other through the intermediation of urethane connecting groups derived from polyvalent isocyanate compound of which the average equivalent of isocyanate group per a molecule is more than 2 and less than 3.

Lactide copolymer, a preparation method thereof, and a resin composition including the same

This disclosure relates to a method for preparing alkyl lactate with high yield and high selectivity, comprising the step of reacting glycerol with water or alcohol in the presence of a catalyst. In addition, the present invention provides a method for efficiently preparing lactamide using the alkyl lactate.

Method for preparing alkyl lactate and a method for preparing lactamide using the same

Disclosed are polylactide resin that may exhibit and maintain excellent mechanical properties, exhibit excellent heat resistance, and thus can be used for a semi-permanent use, a method for preparing the same, and a polylactide resin composition comprising the same. The polylactide resin has a low hydrolysis rate constant of 0.1 dayor less and a weight average molecular weight of 100,000&#x2dc;1,000,000, under specific conditions.

Polylactide resin, method of preparing the same, and polylactide resin composition comprising the same

The present invention relates to a polysiloxane-polylactide block copolymer and a preparation method thereof, in which the polysiloxane-polylactide block copolymer has improved impact resistance and flexibility, compared to the conventional polylactide resins and can be prepared by ring-opening polymerization of lactide monomers in the presence of a polymerization initiator of polysiloxane.

Polysiloxane-polylactide block copolymer and preparation method thereof

The present invention relates to a catalyst system for preparing a cyclic olefin addition polymer, a method for preparing the catalyst system and a cyclic olefin addition polymer prepared by the method, and more particularly to the method comprising the steps of contacting some content of norbornene-based monomer having a specific polar functional group with a catalyst system comprising a) a Group X transition metal compound; b) a compound comprising a neutral Group XV electron donor ligand having a cone angle of at least 160&#xb0;; and c) a salt capable of offering an anion that can be weakly coordinated to the transition metal of the a) the Group X transition metal compound.

Catalyst system for preparing cyclic olefin addition polymer, cyclic olefin addition polymer prepared by using the catalyst system and method for preparing the same

The present invention provides a method for preparing a polymer by precipitation polymerization, comprising the steps of mixing an antisolvent a), a monomer b), and a catalyst c), and while polymerizing the monomers, simultaneously precipitating a polymer formed by the monomers b) in a solid phase.

Method for preparing polymer by precipitation polymerization

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Daejeon, South Korea

Sung-Cheol Yoon