Sk Innovation Co., Ltd.

Sk Global Chemical Co., Ltd.

Sk Energy Co., Ltd.

Sabic Sk Nexlene Company Pte. Ltd.

Sungseok Chae

Myungahn Ok

Choonsik Shim

Daeho Shin

Seungbum Kwon

Hyeongtaek Ham

Jisu Jeong

Dongcheol Shin

Hoseong Lee

Jongsok Hahn

Dong-cheol Shin

Ho-Seong Lee

Kyucheol Cho

Hongdae Kim

Moonseok Lee

The present invention is an uncrosslinked linear medium-density polyethylene resin composition for a power cable, which is applicable to an insulating layer, a semi-conducting layer or a sheath layer. Specifically, the uncrosslinked polyethylene composition includes: 100 parts by weight of a polymer having a linear medium-density polyethylene resin having an &#x3b1;-olefin having 4 or more carbon atoms as a comonomer and having a melt index of 0.6-2.2 g/10 min (at 190&#xb0; C. under a load of 5 kg), a differential scanning calorimetry (DSC) enthalpy of 130-190 joule/g and a molecular weight distribution of 2-30; and 0.1 to 10 parts by weight of one or more additive(s) selected from a flame retardant, an oxidation stabilizer, a UV stabilizer, a heat stabilizer and a process aid.

Uncrosslinked polyethylene composition for power cable

Provided are ethylene copolymers with excellent impact resistance. More specifically, provided are ethylene copolymers satisfying certain correlation between the falling dart impact strength (F) or high rate impact resistant breakage energy (E) and Vicat softening point. The ethylene copolymers with improved impact properties are applicable to film, injection, compound, sheet, roto, pipe or blow molding.

Ethylene copolymer with improved impact resistance

Provided are ethylene copolymers and a process for preparing the same. More specifically, provided are ethylene copolymers exhibiting excellent processibility and physical properties due to its multimodal molecular weight distribution index, through a multi-stage process by using reactors connected in series or in parallel in the presence of catalyst composition containing transition metal catalyst, and a process for preparing the same.

Ethylene copolymer and a method of preparing the same

Provided is a process for preparing copolymers of ethylene with &#x3b1;-olefin. More specifically, provided are transition metal compound being useful as catalyst for preparing those copolymers, a catalyst composition comprising the same, and a process for preparing elastic copolymers of ethylene with &#x3b1;-olefin, having the density of not more than 0.910, which can be adopted to a wide variety of applications including film, electric wires, and hot-melt adhesives. The catalyst composition is a catalytic system which comprises transition metal catalyst comprising a cyclopentadiene derivative and at least one anionic ligand(s) of aryloxy group with an aryl derivative at ortho-position, and boron or aluminum compound as an activator. Provided is a process for copolymerizing ethylene with &#x3b1;-olefin to produce copolymer having narrow molecular weight distribution and uniform density distribution with the density of not more than 0.910, with high activity and excellent reactivity on higher &#x3b1;-olefin.

Method for preparing elastomeric copolymers of ethylene and &#x3b1;-olefins

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Daejeon, South Korea

Sungseok Chae