Korea Kumho Petrochemical Co., Ltd.

Other

Young Hoon Ko

Jae Yun Kim

Jin Man Hwang

Jae Young Ko

Seung Duk Cho

Hoo Chae Kim

Byung C Jeon

Hanjoung Cho

Dae Hyung Lee

Chan Ki Cho

Sun Woo Cheen

Baek Yong Park

Seung Kyung Ko

Seon Kyeong Cheong

Mycong Seup So

Haeng Shin Jang

Provided is a base transceiver station (BTS) apparatus that enables a licensed-assisted access (LAA) service in a licensed band and an unlicensed band. The BTS apparatus includes a head end connected to a BTS for each of multiple bands and carriers through a radio frequency (RF) line and a remote portion connected to one of optic lines that are optically expanded from the head end.

BTS apparatus for licensed-assisted access

Provided is an amplification system for a public safety service. The amplification system may be installed to cover a radio-shadow zone, and stably maintain the service despite a distortion in a wireless environment and an excessive input of a spurious interference signal.

Amplification system for public safety

Disclosed is a terminal modifier for conjugated diene polymers. The terminal modifier has both at least two amine groups and at least one alkoxysilane group. A terminally modified conjugated diene polymer which is coupled at the terminus with the terminal modifier, and a polymer composition for use in tires, comprising the terminally modified, conjugated diene polymer are also provided. When applied to tire treads, the polymer composition comprising the terminally modified, conjugated diene polymer significantly increases the disperability and binding to rubber of silica, thereby greatly contributing to an improvement of the tire treads in dynamic properties including wet traction, rolling resistance, Mooney viscosity and processability.

Terminal modifier for conjugated diene polymers

Provided are an organically modified silica master batch elastomer having superior affinity for silica and a method for preparing the same. A copolymer solution-polymerized from a conjugated diene-based monomer and a vinyl aromatic monomer is mixed in solution with organically modified silica having the silica modified with a specific aliphatic hydrocarbon to prepare the organically modified silica master batch elastomer. The organically modified silica master batch elastomer according to the present invention has improved mechanical properties, abrasion resistance and blending processability over the existing master batch elastomers containing common silica. Thus, when it is used as a tire material, improved fuel efficiency, abrasion resistance and wet traction may be expected.

Master batch elastometer containing organically modified silica and method of preparing the same

The present invention relates to an organic silica master batch elastomer prepared by mixing a conjugated diene based copolymer, a vinyl aromatic copolymer or a mixture thereof prepared by solution polymerization with organically modified silica in which the surface of silica is modified with a particular organosilicon compound and a silane coupling agent in solution. The resultant organic silica master batch elastomer exhibits improved mechanical properties, wear resistance and blending processability, and can provide the effect of extending durability of a tire.

Silica master batch elastomers filled with organically modified silica for a tire and preparation method thereof

This invention relates to a process for selectively hydrogenating the unsaturated double bonds of conjugated diene units of a homopolymer or copolymer. By using a highly active novel homogeneous organo titanium catalyst represented by formula (I) and lithium hydride (LiH) prepared in solution of organo lithium compound and hydrogen as a reducing agent, a polymer could be hydrogenated with significantly high yield and good reproducibility. In addition, this invention is characterized by a novel method in that when a copolymer containing a conjugated diene and vinyl-substituted aromatic hydrocarbon, the unsatured double bonds of conjugated diene units are selectively hydrogenated. In said formula where, Cp is a cyclopentadienyl group (CH); Rand Rare the same or different and are selected from halogen atom; Rand Rare the same of different and are selected from hydrogen atoms, alkyl or alkoxy group containing 1 to 12 carbon atoms, aryl or aryloxy groups containing 6 to 20 carbon atoms and cycloalkyl groups containing 6 to 20 carbon atoms.

Process for hydrogenating a conjugated diene polymer

End-modified styrene-diene block copolymer prepared using polyfunctional coupling agent

Method for the selective hydrogenation of polymer containing conjugated diene

This invention is to provide a process for the hydrogenation of conjugated diene polymer in an inert organic solvent, said polymer being obtained by polymerization or copolymerization of a conjugated diene, which comprise effecting selective hydrogenation of unsaturated double bonds in the conjugated diene units of said conjugated diene polymer in the presence of catalyst represented by the following formula (I) ##STR1## wherein Cp is cyclopentadienyl (C.sub.5 H.sub. --);

Living polymer hydrogenation catalyst and process for hydrogenating

The present invention relates to a polymerization method for preparing non-halogenated aromatic polyesters by a standard interfacial polymerization except the addition of a phase-transfer catalyst to the organic phase. More specifically, the present invention offers a method for substantially reducing the polymerization time and improving the reaction yield, by introducing a specific phase transfer catalyst, tetrabutyl ammonium bromide, to the organic phase.

Polymerization method for preparing non-halogenated aromatic

A phosphorus-containing wholly aromatic polyester is produced by an interfacial polymerization method which includes the step of reacting a phosphorus-containing bisphenol compound and a bisphenol compound with dicarboxylic acid chlorides. An organic layer containing the dicarboxylic acid chlorides and phase transfer catalyst is added into an alkaline aqueous layer which contains a bisphenol compound.

Growing community of inventors

Daejeon, South Korea

Young Hoon Ko