The present invention provides a catalyst composition including a functionalizing agent of the following Formula 1 together with a rare earth metal compound, an alkylating agent, and a halogen compound, having good catalytic activity and polymerization reactivity and useful for the preparation of a conjugated diene-based polymer having high linearity and excellent processability, and a conjugated diene-based polymer prepared using the catalyst composition
(X.sub.1).sub.a—Sn—(X.sub.2).sub.4-a  [Formula 1]
wherein, a, X.sub.1, and X.sub.2 are the same as defined in the disclosure.

An antireflective film including: a support base, and a pattern composed of a photoresist material formed on the support base, the pattern having a larger size at a point closer to the support base. The photoresist material contains a polymer compound having an aromatic group, and the polymer compound includes at least one of: (i) a repeating unit having a cyclopentadienyl complex structure, (ii) a repeating unit having a naphthalene structure, and (iii) a repeating unit having a naphthalene structure and/or a fluorene structure. The repeating units having a naphthalene structure may include one of the following units:

##STR00001##

The disclosed antireflective film shows an antireflection effect to decrease the reflection of light. A method of producing the antireflective film, and an eyeglass type display including the antireflective film are disclosed.

An antireflective film including: a support base, and a pattern composed of a photoresist material formed on the support base, the pattern having a larger size at a point closer to the support base. The photoresist material contains a polymer compound having an aromatic group, and the polymer compound includes at least one of: (i) a repeating unit having a cyclopentadienyl complex structure, (ii) a repeating unit having a naphthalene structure, and (iii) a repeating unit having a naphthalene structure and/or a fluorene structure. The repeating units having a naphthalene structure may include one of the following units:

##STR00001##

The disclosed antireflective film shows an antireflection effect to decrease the reflection of light. A method of producing the antireflective film, and an eyeglass type display including the antireflective film are disclosed.

A functional polymer of styrene derivative a copolymer of a monomer A having the structure represented by the formula (I) and a comonomer. The functional polymer of styrene derivative of the present invention can be easily further chemically modified. Meanwhile, basic properties of the functional polymer, such as glass transition temperature, viscoelasticity and the like, can be easily adjusted by adjusting the amount of the styrene derivative added. ##STR00001##

A functional polymer of styrene derivative a copolymer of a monomer A having the structure represented by the formula (I) and a comonomer. The functional polymer of styrene derivative of the present invention can be easily further chemically modified. Meanwhile, basic properties of the functional polymer, such as glass transition temperature, viscoelasticity and the like, can be easily adjusted by adjusting the amount of the styrene derivative added. ##STR00001##

The present invention relates to an amorphous functionalized olefin copolymer composition and a process for the preparation of an amorphous functionalized olefin copolymer composition.

The present invention relates to an amorphous functionalized olefin copolymer composition and a process for the preparation of an amorphous functionalized olefin copolymer composition.

The present invention relates to an amorphous polyolefinic ionomer and a process for the preparation of an amorphous polyolefinic ionomer.

The present invention relates to an amorphous polyolefinic ionomer and a process for the preparation of an amorphous polyolefinic ionomer.

The present invention relates to an ethylene and propylene ionomer and a process for the preparation of an ethylene and propylene ionomer.