Lg Chem, Ltd

Korea Institute of Geoscience and Mineral Resources

Hyosun Lee

Bun Yeoul Lee

Choong Hoon Lee

Dae Woo Nam

Boong-Goon Jeong

Sung-Don Hong

Bun-Yeoul Lee

Dae-Woo Nam

Sung Don Hong

Young Whan Park

Seungwhan Jung

Young Chul Won

Kwang Ho Song

Young-Chul Won

Jong Joo Ha

Young-Whan Park

Sung-Ho Cho

Beomdoo Seo

Kwang-Ho Song

Hyun-Key Jung

Eunjung Lee

Seung Whan Jung

Boong Goon Jeong

Hyoungrea Rim

Hye Young Jung

Jong-Joo 3-403 Lg Company Housing Apt Ha

Choong-Hoon 8-202 Lg Company Housing Apt Lee

Young-Whan 102-203 Wooseong Apt 383-3 Park

Eunjung 903-1105 Yeolmaemaeul 9Danji Lee

Beomdoo 110-1304 Samsung Hanul Apt Seo

An electric field sensor for underwater, including a sensing unit that senses a change in an electric field and transfers a sensing signal of the electric field to a signal line, a waterproof sealing unit that keeps a signal transferring portion of the sensing unit in a waterproof state, and a water-passing protection unit that shields and protects an exposed portion of the sensing unit. The sensing unit includes a nonconductive hollow pipe connected to the signal line, a sheet of carbon fiber that is wound around the outer surface of the hollow pipe and that senses an electric field, and a terminal ring that is electrically conductively installed at an end portion of the sheet of carbon fiber to provide a connection portion of the signal line and that is watertightly sealed by the waterproof sealing unit.

Electric field sensor for underwater

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

There are provided a method of simply preparing a 1,4,6-substituted, 1,4-substituted, 1,6-substituted, or 1-substituted fulvene compound, the intermediates of the fulvene compound, and a method of preparing an ansa-metallocene compound in which two cyclopentadienyl ligands are bridged by one carbon and there are substituents only at positions adjacent to the bridging point of a cyclopentadienyl ligand, using the fulvene compound.

Method of preparing fulvene compounds and method of preparing ansa-metallocene compounds using the compounds

Growing community of inventors

Daejeon, South Korea

Hyosun Lee