Lg Chem, Ltd

Eunjung Lee

Choong Hoon Lee

Ki Soo Lee

Bun Yeoul Lee

Boram Lee

Sangwoo Lee

Sung Don Hong

Young Whan Park

Seungwhan Jung

Jong Joo Ha

Young Chul Won

Jung A Lee

Beomdoo Seo

Seung Whan Jung

Hyosun Lee

Soojeong Lee

Seungwoo Choi

Provided are a bridged metallocene compound particularly suitable for copolymerization of ethylene and alpha-olefin or cyclic olefin, a process of preparing the metallocene compound, and a process of preparing polyolefin using the metallocene compound. The bridged metallocene compound has low steric hindrance and good (co)polymerization activity, and thus, exhibits good activity in copolymerization of ethylene and alpha-olefin such as 1-hexene or 1-octene. Furthermore, the process of preparing the bridged metallocene compound is simplified, and thus, suitable for mass production.

Ansa-metallocene compound, process of preparing the same, and process of preparing polyolefin using the same

Provided is catalyst composition including a transition metal complex precatalyst represented by Formula 1; a first cocatalyst represented by Formula 2 which is an alkylaluminum compound; and a second cocatalyst represented by Formula 3 which is a salt compound comprising a Bronsted acid cation and a noncoordinating, compatible anion.  A catalyst composition including binuclear transition metal complexes, an alkylaluminum compound, and a salt compound including a Bronsted acid cation, and a noncoordinating, compatible anion, and a method of preparing the catalyst composition are provided.

Catalyst composition including transition metal complexes and olefin polymerization using the same

An ethylene-based copolymer for non-crosslinked water supply pipe is provided. The ethylene-based copolymer is prepared using a supported hybrid metallocene catalyst and has a dimodal or broad molecular weight distribution. The ethylene-based copolymer has a high density molecular structure in a low molecular weight and has a low density molecular structure with high content of a comonomer in a high molecular weight. The ethylene-based copolymer has a molecular weight distribution of 5-30 and the distribution of copolymerization of ethylene and C&#x3b1;-olefin is localized in high molecular weight chains. Accordingly, the ethylene-based copolymer has superior processability, internal pressure creep resistance at high temperatures and environmental stress crack resistance.

Polyethylene pipe having better melt processibility and high resistance to stress and method of preparing the same using metallocene catalyst

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Daejeon, South Korea

Eunjung Lee