Lg Chem, Ltd

Young Suk You

Ki Soo Lee

Dae Sik Hong

Eun Kyoung Song

Yi Young Choi

Heon Yong Kwon

Eun Young Shin

Joong Soo Kim

Hyuck Ju Kwon

Jin Young Lee

Myung Han Lee

Sung Ho Park

Sung Hyun Park

Hyun Jee Kwon

Kyung Jin Cho

Yoon Ki Hong

Hyun Sup Lee

Seung Mi Lee

Ye Jin Lee

Yong Ho Lee

Dae Hwan Kim

Sung Min Lee

Sun Mi Kim

Se Young Kim

Soon Ho Sun

Jeong Kyu Lee

Yu Taek Sung

Jong Sang Park

Jong Chan Lee

Se Jung Park

Woo Ri Kim

Ki Heon Song

Eun Yeob Choi

A polyethylene composition may include one or more types of ethylene-alpha-olefin copolymers. In the polyethylene composition, a successive self-nucleation and annealing (SSA) thermogram representing a relationship between heat flow and temperature satisfies Equation 1:0.16≤B/A≤0.4. In Equation 1, A means an area for an entire temperature region in the SSA thermogram, and B means an area for a temperature region of 128° C. or higher in the SSA thermogram. A biaxially stretched film may include the polyethylene composition.

Polyethylene composition and biaxially stretched film comprising same

A method for evaluating long-term durability of a resin for piping is provided. Unlike the conventional FNCT evaluation method requiring a long period of time, the method disclosed herein is capable of predicting long-term durability of a resin for piping in a short time, by a simple calculation using a content of tie molecules, an entanglement molecular weight (M) and a content of ultrahigh molecular weight components. In addition, the olefinic polymer is configured to have a predetermined relationship in relation to the content of tie molecules, the entanglement molecular weight (M) and the content of ultrahigh molecular weight components, whereby the polymer of the present application can be used in the manufacture of a heating pipe requiring excellent long-term durability.

Method for predicting long-term durability of resin composition for piping and olefinic polymer used for resin for piping

The present invention relates to a method for predicting the physical properties of polymers. More specifically, the present invention relates to a method for predicting the processability of polymers using a molecular weight distribution curve.

Method for predicting physical properties of polymers

The present invention provides a method for preparing a polyolefin having a broad molecular weight distribution. More specifically, the present invention provides a method for preparing a polyolefin having a broad molecular weight distribution and an ultra-high molecular weight in which an organometallic complex containing a specific Ti&#x2014;Al complex structure is used as a molecular weight controller (i.e., molecular weight enhance) in the polymerization of an olefin monomer, thereby enabling both solution polymerization and slurry polymerization, particularly enabling the molecular weight distribution to be more readily and effectively controlled.

Method for preparing polyolefin

The present disclosure relates to an assessment method for a polyethylene resin, and more specifically to a new assessment method for a polyethylene resin which can accurately determine long-term durability of a molded article by using physical properties that are easily measurable in a short time.

Assessment method for polyethylene resin

The present invention relates to a supported hybrid catalyst and a method for preparing olefin polymer using the same. Using the supported hybrid catalyst, olefin polymer that maintains excellent mechanical strength of olefin polymer polymerized with the existing metallocene catalyst, but exhibits remarkably improved processibility compared to the existing olefin polymer, can be provided.

Supported hybrid catalyst and method for preparing olefin polymer using the same

The present invention relates to a method for predicting the physical properties of polymers. More specifically, the present invention relates to a method for predicting long-term stability of polymers using a molecular weight distribution curve.

The present invention provides a metallocene supported catalyst that can prepare a polyolefin having excellent transparency even when processed into a film, as well as excellent processibility and mechanical properties, with high catalytic activity, and a method for preparing a polyolefin using the same.

Metallocene supported catalyst and method for preparing polyolefin using the same

The present invention relates to polyolefin powder for preparing fiber, and fiber comprising the same. According to the present invention, provided is polyolefin, which exhibits a high molecular weight range and narrow molecular weight distribution and in which the formation of a gel deteriorating the quality of fiber is reduced. Therefore, by using the polyolefin, the present invention exhibits molecular weight, density and narrow molecular weight distribution, which are equivalent to those of conventional polyolefin, but the number of gels having a large particle diameter is remarkably reduced, and therefore, the present invention can provide fiber having excellent tenacity and tensile strength half-life.

Polyolefin for preparing fiber and fiber comprising the same

A method of preparing a supported metallocene catalyst capable of more effectively preparing a polyolefin which may be preferably used for blow molding, etc., because its molecular weight distribution is such that polymer elasticity is increased to improve swell, is provided.

Method of preparing supported metallocene catalyst

The present invention relates to a polyolefin which exhibits a narrow molecular weight distribution, high strength, and a high stretching ratio, and a preparation method therefor. According to the present invention, it is possible to provide polyethylene with high catalyst activity, high molecular weight, and controlled molecular weight distribution by using, in polymerization of an olefin monomer, a hybrid supported metallocene catalyst in which a borate compound is used as a second cocatalyst. In addition, if the polyolefin is processed, it is possible to produce a fiber with excellent mechanical properties and an excellent stretching ratio.

Method for preparing polyolefin polymer for fiber production

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Daejeon, South Korea

Young Suk You