Korea Kumho Petrochemical Co., Ltd.

Sung Hoon Han

Dong Hwan Kim

Gwanghoon Kwag

Shin Han

June Soo Park

Seung Hwa Lee

Hyung Kyu Choi

Ji Hyun Heo

Pilsung Kim

Cheolbeom Bae

Se-Hee Jung

Disclosed is a copolymer including a first part including an aromatic vinyl-based monomer and a conjugated diene-based monomer; and a second part including an aromatic vinyl-based monomer and a conjugated diene-based monomer, wherein the content of the aromatic vinyl-based monomer is 35 to 45% by weight based on a total weight of the copolymer, and the copolymer satisfies Equation 1 below:V&#x3e;V&#x2003;&#x2003;&#x3c;Equation 1&#x3e;

Copolymer, rubber composition, and method of preparing the same

The present invention relates to a method for preparing neodymium-carbon-nanotube and a process for preparing 1,4-cis-polybutadiene utilizing the same and more particularly, neodymium-carbon-nanotube. Neodymium is introduced by coordination with carboxylic acid, which is formed on the surface of carbon nanotube. In 1,3-butadiene polymerization with the neodymium-catalyst comprising the neodymium-carbon nanotube, a particular halogen compound, and a particular organometallic compound in an appropriate ratio, high 1,4-cis polybutadiene having molecular weight of 10,000 to 2,000,000 is produced, which exhibits excellent mechanical properties such as elasticity and durability.

Neodymium-carbon nanotube and method of preparing high 1,4-cis-polybutadiene using the same

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Sejong-si, South Korea

Sung Hoon Han