Lg Chem, Ltd

Industry-university Cooperation Foundation Hanyang University

Unitest Inc.

Iucf-hyu

Tripl Co., Ltd.

Eun Ji Shin

Ki Soo Lee

Seok Pil Sa

Yong Ho Lee

Seul Ki Im

Jin Young Park

Yoon Ki Hong

Hyun Mo Lee

Bun Yeoul Lee

Ji Hyun Park

Yun Kon Kim

Seung Mi Lee

Sung Soo Yoon

No Ma Kim

Je Gwon Lee

Myung Han Lee

Sung Hyun Park

Hyun Jin Lee

Yang Kyoo Han

Hyun Ju Lee

Jun Won Baek

Seung Jung Yu

Jin Young Lee

Heon Yong Kwon

Mi Kyung Kim

Sung Ho Park

Dae Woong Lee

Hyun Jee Kwon

Tae Hee Kim

Sol Cho

Yeon Sik Jung

Dong Min Kim

Oh Joo Kwon

Hwan No Lee

Jong Kill Park

Jae Suk Huh

Seong Ki No

Byung Soo Yoo

Byung Woo Lee

Kyung Lee Park

The present invention relates to an anionic polymerization initiator represented by Formula 1 below for producing a polyolefin-polystyrene block copolymer, an anionic polymerization initiator composition, and a production method therefor,

Anionic polymerization initiator, anionic polymerization initiator composition, and production method therefor

The present invention relates to a method for preparing a polyolefin-polystyrene-based multiblock copolymer having a uniform structure and showing excellent physical properties through continuous type coordination polymerization and batch type anionic polymerization.

Method for preparing polyolefin-polystyrene-based multiblock copolymer

The present invention relates to a thermoplastic resin composition including a polyolefin-polystyrene-based multi-block copolymer having a structure in which a polystyrene chain is attached to both ends of a polypropylene and polyolefin chain, and the thermoplastic resin composition according to the present invention exhibits high fluidity properties as well as soft feel and high restoring force.

Thermoplastic resin composition

The present invention relates to a method for preparing a cocatalyst compound using an anhydrous hydrocarbon solvent, and a cocatalyst compound prepared thereby.

Method for preparing cocatalyst compound using anhydrous hydrocarbon solvent

A ligand compound having a novel structure, a transition metal compound including the same, a catalyst composition including the transition metal compound, and a method of preparing an olefin polymer using the catalyst composition are disclosed herein. In some embodiments, the transition metal compound is represented by Formula 1. In some embodiments, the ligand compound is represented by Formula 2.

Ligand compound, transition metal compound, and catalyst composition including the same

A polyolefin-polystyrene multi-block copolymer and a method of producing the same is disclosed herein. In some embodiments, the polyolefin-polystyrene multi-block copolymer has a first complex viscosity of 40,000 Pa·s to 350,000 Pa·s at a temperature of 160° C. and a first frequency of 0.5 rad/s, and has a second complex viscosity of 900 Pa·s to 3,500 Pa·s at a temperature of 160° C. and a second frequency of 125 rad/s. The polyolefin-polystyrene multi-block copolymer has a structure in which polystyrene chains are attached to both ends of a polyolefin chain.

Polyolefin-polystyrene multi-block copolymer and method for producing same

A polyolefin-polystyrene multi-block copolymer and method of making the same is disclosed herein. In some embodiments, a polyolefin-polystyrene multi-block copolymer having a ratio of a loss modulus (E″) to a storage modulus (E') satisfying the following conditions (a) and (b) over a temperature range of −80° C. to 40° C., wherein the ratio is represented by a loss tangent (tan δ) value and is obtained by dynamic mechanical analysis (DMA), (a) a maximum of the tan δ value in a peak present in the temperature range is 0.20 to 0.35, and (b) a half-width of the peak ranges from 32.0° C. to 50.0° C. The polyolefin-polystyrene multi-block copolymer has a structure in which polystyrene chains are attached to both ends of a polyolefin chain.

A method for producing a block copolymer composition including a diblock copolymer and a triblock copolymer each containing a polyolefin-based block and a polystyrene-based block is disclosed herein. In some embodiments, the method includes reacting an organic zinc compound with one or more kinds of olefin-based monomers in the presence of a transition metal catalyst to form an intermediate having an olefin-based polymer block, reacting the intermediate styrene-based monomer in the presence of an alkyllithium compound to form a product having a styrene-based polymer block, and reacting the product with water, oxygen, or an organic acid to form a block copolymer wherein the number of moles of the alkyllithium compound used to form the product is larger than the number of moles of the organic zinc compound used to form the intermediate.

Method for producing block copolymer composition

A block copolymer composition is disclosed herein. In some embodiments, a block copolymer composition has a weight average molecular weight (M) of 70,000 g/mol to 120,000 g/mol, a polydispersity index (PDI) of 1.0 to 2.0, a glass transition temperature (T) of &#x2212;55&#xb0; C. to &#x2212;30&#xb0; C., and a melt index (MI), measured at 230&#xb0; C. and a loading condition of 5 kg, of 0.2 g/10 minutes to 3.0 g/10 minutes. The block copolymer composition has excellent processability.

Block copolymer composition

A block copolymer composition is disclosed herein. In some embodiments, the block copolymer composition includes a diblock copolymer and a triblock copolymer each including a polyolefin-based block and a polystyrene-based block. The diblock copolymer is present at less than or equal to 19% , based on total weight of the block copolymer composition, the polyolefin-based block includes a repeating unit represented by Formula 1, and the polystyrene-based block includes one or more of Formulas 2 and 3:  wherein Ris hydrogen, C3 to C20 alkyl, or C3 to C20 alkyl substituted with silyl, Rand Rare each independently C6 to C20 aryl, or C6 to C20 aryl substituted with halogen, C1 to C12 alkyl, or C3 to C12 cycloalkyl, n is an integer from 1 to 10,000, and l and m are each independently an integer from 10 to 1,000.

A block copolymer composition is disclosed herein. In some embodiments, a block copolymer composition includes a diblock copolymer and a triblock copolymer, each including a polyolefin-based block and a polystyrene-based block, wherein the polyolefin-based blocks are present between 45 wt % to 90 wt %, wherein the polystyrene-based blocks are present between 10 wt % to 55 wt %, wherein the difference (&#x394;T) between a thermal decomposition initiation temperature and a thermal decomposition termination temperature (&#x394;T) measured by Thermo-Gravimetric Analysis (TGA) is 55&#xb0; C. or greater, and the diblock copolymer and the triblock copolymer do not have a residual unsaturated bond.

The present invention relates to a ligand compound, a catalyst system for olefin oligomerization and a method for oligomerizing an olefin using same. The catalyst system for olefin oligomerization according to the present invention exhibits high selectivity to 1-hexene or 1-octene while having excellent catalytic activity, thus enabling more efficient preparation of alpha-olefins.

Ligand compound, organic chromium compound, catalyst system for olefin oligomerizatin, and method for oligomerizing olefin using same

The present invention relates to a method for preparing an oligomerization catalyst system and the method comprises preparing a catalyst composition by mixing a PNP-based ligand compound and a transition metal compound, and mixing and activating a co-catalyst and the catalyst composition at a temperature from &#x2212;40 to 80&#xb0; C. The oligomerization catalyst system prepared by the method may maintain the activity thereof during an oligomerization reaction at a high temperature, and the reaction temperature of oligomerization may be easily controlled. Various merits in processing may be obtained.

Method for preparing oligomerization catalyst system and oligomerization catalyst system prepared thereby

The present invention relates to a sealed plasma melting furnace for treating low- and intermediate-level radioactive waste, which allows the secondary pollutants to be minimized. The sealed plasma melting furnace includes: a waste supply chamber communicatively provided with a hopper; a pyrolysis chamber channel communicatively coupled with the waste supply chamber; a pyrolysis chamber having a burner mounted thereon; a melting chamber channel guiding the waste transferred from the pyrolysis chamber communicatively provided therewith to fall down; a melting chamber provided with a furnace interior portion accommodating a molten substance on a bottom surface thereof; a processed molten substance discharge channel discharging the processed molten substance generated in the melting chamber; a secondary combustion chamber channel inducing and exhausting an off-gas flow generated in the melting chamber; and a secondary combustion chamber inducing complete combustion of the off-gas input from the secondary combustion chamber channel.

Sealed plasma melting furnace for treating low- and intermediate-level radioactive waste

Ligand compound, organic chromium compound, catalyst system for olefin oligomerization, and method for oligomerizing olefin using same

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Daejeon, South Korea

Eun Ji Shin