Lg Chem, Ltd

Jin Sook Ryu

Suk Youn Kang

Jeong Heon Ahn

Kyoung Hwan Oh

Woo Jin Cho

Soo Young Choi

Suk Joon Yoo

Sun Ok Oh

Hee Jung Jeon

Myung Han Lee

Hyemin Lee

Sung Joon Oh

Sung Hyun Park

Sung Yeol Choi

Duk Hun Jang

Hye Sung Cho

Byung Guk Kim

Su Hwa Kim

Sang Gon Kim

Hyung Sam Choi

Seung Yup Lee

Young Sik Eom

Hyo Yong Kim

Sunok Oh

The present invention relates to a rubber composition having excellent tensile properties and viscoelasticity properties and including a conjugated diene-based polymer. The rubber composition may include a modified conjugated diene-based polymer which is selected considering target tensile properties and viscoelasticity properties, by predicting in advance the correlation between the modification ratio of the modified conjugated diene-based polymer and the dynamic viscoelasticity loss coefficient at 60&#xb0; C. of the rubber composition through Mathematical Formula 1 and Mathematical Formula 2. Therefore, excellent compounding properties may be shown.

Rubber composition

A method for preparing a catalyst for use in polymerizing a conjugated diene-based monomer, the catalyst, and a method for preparing a conjugated diene-based polymer using the same are disclosed herein. In an embodiment, a method of preparing a catalyst comprises mixing a lanthanide rare earth element-containing compound, an alkylating agent compound and a halogen compound in the presence of a solvent to prepare a catalyst composition, adding a conjugated diene-based monomer to the catalyst composition to form a preformed catalyst composition, and aging the preformed catalyst composition at a temperature of &#x2212;1&#xb0; C. to &#x2212;15&#xb0; C. for 3 hours to 98 hours to prepare the catalyst. The catalyst has excellent catalyst activity and polymerization reactivity and is useful for preparing a conjugated diene-based polymer which has an excellent modification ratio and improved compounding properties.

Method for preparing catalyst for polymerizing conjugated diene, catalyst and method for preparing conjugated diene-based polymer using the same

The present invention relates to a rubber composition having excellent tensile properties and viscoelasticity properties and including a modified conjugated diene-based polymer. The rubber composition may include a modified conjugated diene-based polymer which is selected considering target tensile properties and viscoelasticity properties, by predicting in advance the correlation of the modification ratio of the modified conjugated diene-based polymer and the dynamic viscoelasticity loss coefficient at 60&#xb0; C. of the rubber composition through Mathematical Formula 1 and Mathematical Formula 2. Therefore, excellent compounding properties may be shown.

The present disclosure relates to a polyimide-based block copolymer and a polyimide-based block copolymer film including the same. The polyimide-based block copolymer according to the present disclosure makes it possible to provide a polyimide-based film having low haze and yellow index value while exhibiting excellent transparency.

Polyimide-based block copolymer and polyimide-based film comprising the same

The present invention provides a catalyst composition including a functionalizing agent of the following Formula 1 together with a rare earth metal compound, an alkylating agent, and a halogen compound, having good catalytic activity and polymerization reactivity and useful for the preparation of a conjugated diene-based polymer having high linearity and excellent processability, and a conjugated diene-based polymer prepared using the catalyst composition(X)&#x2014;Sn&#x2014;(X)&#x2003;&#x2003;[Formula 1]wherein, a, X, and Xare the same as defined in the disclosure.

Catalyst composition for preparing conjugated diene-based polymer and conjugated diene-based polymer prepared using the same

The present invention provides a catalyst composition including a functionalizing agent of the following Formula 1 together with a rare earth metal compound, an alkylating agent, and a halogen compound, having good catalytic activity and polymerization reactivity and useful for the preparation of a conjugated diene-based polymer having high linearity and excellent processability, and a conjugated diene-based polymer prepared using the catalyst composition.(X)&#x2014;Sn&#x2014;(X)&#x2003;&#x2003;[Formula 1] In Formula 1, a, X, and Xare the same as defined in the disclosure.

The present invention relates to a superabsorbent polymer showing a low degree of decrease in absorption capacity, and a preparation method thereof. Specifically, the present invention provides a superabsorbent polymer having an excellent rewetting prevention ability such that moisture hardly leaks out under pressure even after a certain time, and a preparation method thereof, by preparing an acrylic resin with a high molecular weight main chain that is evenly cross-linked for maintaining high gel strength by minimizing an amount of an initiator with respect to a monomer.

Superabsorbent polymer and preparation method thereof

The present disclosure relates to an apparatus and a method for analyzing side chains of a polymer. More specifically, the present disclosure relates to an apparatus and a method for analyzing the number of side chains of a polymer.

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Daejeon, South Korea

Jin Sook Ryu