Lg Chem, Ltd

Man-Seong Jeon

Ki-Soo Lee

Dae-Sik Hong

Yong-Ho Lee

Min-Seok Cho

Heon-Yong Kwon

Seon-Kyoung Kim

Kyoung-Chan Lim

Hyeon-Gook Kim

Eun-Kyoung Song

Ki Soo Lee

Yong Ho Lee

Dae Sik Hong

Heon Yong Kwon

Eun Kyoung Song

Min Seok Cho

Se-Hui Sohn

Jong-Sang Park

Joon-Hee Cho

Jeong-Min Kim

The present description relates to an olefin block copolymer with excellences in elasticity, heat resistance, and processability. The olefin block copolymer comprises a plurality of blocks or segments, each comprising an ethylene or propylene repeating unit and an &#x3b1;-olefin repeating unit at different mole fractions. The olefin block copolymer comprises polymer chains containing 20 to 100 short-chain branches (SCBs) per 1,000 carbon atoms. A point where a first derivative of the number Y of the SCBs per 1,000 carbon atoms of each polymer chain with respect to the molecular weight X of the polymer chain is 0 exists between the minimum and maximum values of the molecular weight X.

Olefin block copolymer

A preparation method of a catalyst for polyolefin polymerization capable of polymerizing low-density polyethylene in a single reactor without separately injecting a comonomer to thereby prepare a final product with a low cost through a more simplified process, a catalyst obtained by the preparation method, and a preparation method of a polyolefin using the catalyst are provided.

Preparation method of catalyst for polyolefin polymerization and preparation method of polyolefin

The present description relates to olefin block copolymers having excellent elasticity and processability in conjunction with enhanced heat resistance, and to a preparation method thereof. The olefin block copolymers comprise a plurality of blocks or segments that comprise ethylene or propylene repeating units and &#x3b1;-olefin repeating units at different mole fractions from one another, wherein the block copolymer shows peaks at the 2&#x3b8; of 21.5&#xb1;0.5&#xb0; and 23.7&#xb1;0.5&#xb0; in a wide-angle x-ray diffraction (WAXD) pattern, and the peak ratio defined by (the peak area at 21.5&#xb1;0.5&#xb0;)/(the peak area at 23.7&#xb1;0.5&#xb0;) is no more than 3.0.

Olefin block copolymers and production methods thereof

The present invention relates to a novel metallocene compound, a catalyst composition comprising the same, and to olefinic polymers produced using the same. The metallocene compound according to the present invention and the catalyst composition comprising the same can be used when producing olefinic polymers, have outstanding copolymerization properties, and can produce olefinic polymers of high molecular weight. In particular, when the metallocene compound according to the present invention is employed, highly heat resistant block copolymers can be produced, and olefinic polymers can be produced which have a high melting point (Tm) even if the comonomer content is increased when producing the olefinic polymer.

Metallocene compound, catalyst composition comprising the same, and an olefinic polymer produced using the same

The present description relates to an olefin block copolymer with enhanced processability as well as excellences in elasticity and heat resistance, and a preparation method for the same. The olefin block copolymer includes first and second segments, each containing an ethylene or propylene repeating unit and an &#x3b1;-olefin repeating unit at different mole fractions, where the second segment is dispersed in the form of a closed curve as a dispersed phase on the first segment according to a TEM (Transmission Electron Microscope) image.

The present invention relates to a preparation method of a metallocene catalyst. More particularly, the present invention relates to a preparation method of a supported hybrid metallocene catalyst, including the steps of treating a support having a water content of 4 to 7% by weight with trialkyl aluminum at a predetermined temperature; supporting alkyl aluminoxane on the support; and supporting a metallocene compound on the alkyl aluminoxane-supported support. According to the present invention, it is possible to prepare a supported hybrid metallocene catalyst which shows a high activity in the polymerization of olefins and enables the preparation of polyolefins having a high bulk density, by a simple process.

Method for preparing supported hybrid metallocene catalyst

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Daejeon, South Korea

Man-Seong Jeon