Lg Chem, Ltd

Sung Hyun Park

Myung Han Lee

Ki Soo Lee

Dae Sik Hong

Heon Yong Kwon

Oh Joo Kwon

Yi Young Choi

Soon Ho Sun

Hyun Sup Lee

Sol Cho

Hyeon Sik Choi

Gi Cheul Kim

Bog Ki Hong

Sung Soo Park

Hyo Sook Joo

Ju Eun Kim

Hee Jung Choi

Ki Youl Yoon

Ye Hoon Im

Eun Ji Shin

Jin Young Lee

Seul Ki Im

Sung Ho Park

Hyun Jee Kwon

Young Suk You

Joong Soo Kim

Chae Gyu Lee

Jin Young Park

Seok Pil Sa

Sung Min Lee

Jeong Heon Ahn

Hyemin Lee

Sun Mi Kim

Hyunsup Lee

Dae Woong Lee

Kyoung Hwan Oh

Suk Youn Kang

Ji Hyun Park

Hyo Jin Bae

Yu Taek Sung

Hyun Mo Lee

Woo Jin Cho

Seung Mi Lee

Jin Sook Ryu

Dae Chul Kim

Jong Sang Park

Kyoung Hoon Min

Yun Kon Kim

Jeongyong Lee

Seung Ki Park

Sang Eun Kim

Daewoong Lee

Chang Kwon Chung

Hyungmin Ahn

Jeongnam Kim

A polyolefin-polystyrene multi-block copolymer and method of making the same is disclosed herein. In some embodiments, a polyolefin-polystyrene multi-block copolymer having a ratio of a loss modulus (E″) to a storage modulus (E') satisfying the following conditions (a) and (b) over a temperature range of −80° C. to 40° C., wherein the ratio is represented by a loss tangent (tan δ) value and is obtained by dynamic mechanical analysis (DMA), (a) a maximum of the tan δ value in a peak present in the temperature range is 0.20 to 0.35, and (b) a half-width of the peak ranges from 32.0° C. to 50.0° C. The polyolefin-polystyrene multi-block copolymer has a structure in which polystyrene chains are attached to both ends of a polyolefin chain.

Polyolefin-polystyrene multi-block copolymer and method for producing same

The present invention relates to a method for evaluating an injection physical property of a plastic resin, and a polyethylene resin suitable for an injection molding process and, more particularly, to a novel method for evaluating an injection physical property of a plastic resin, which, when a particular plastic resin is processed by an injection process, can accurately derive injection suitability of the plastic resin and injection pressure in the injection process through a physical property value measured by using a resin specimen, and a polyethylene resin suitable for injection molding.

Assessment method for injection molding property of plastic form

The present disclosure provides an olefin polymer having excellent film processability and physical properties, and a preparation method of the same.

Olefin polymer and preparation method thereof

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 super-absorbent polymer having excellent properties, both centrifugal retention capacity (CRC) and absorption under pressure (AUP) having been improved by introducing a surface crosslinked layer crosslinked by surface-modified inorganic particles, and to a method for preparing the same. The super-absorbent polymer comprises: a base resin powder containing a crosslinked polymer of water-soluble ethylene-based unsaturated monomers having an at least partially neutralized acidic group; and a surface crosslinked layer formed on the base resin powder, wherein inorganic particles may be chemically bound to the crosslinked polymer contained in the surface crosslinked layer, via an oxygen-containing bond or a nitrogen-containing bond.

Method for preparing super-absorbent polymer

The present application relates to a method for selecting an injection-molded article and a method for manufacturing an injection-molded article. An injection-molded article having excellent crack stability can be produced using the material selected using the described selection method without having to manufacture test articles through injection molding.

Method for selecting material of injection-molded article and method for manufacturing injection-molded article

A method of preparing a poly(ether ester) copolymer is provided, and more particularly, a method of preparing a poly(ether ester) copolymer having a high content of a polyether and high viscosity by using a dicarboxylic acid as a starting material is provided. According to the present invention, a dicarboxylic acid of which production cost is low is used as a starting material to prepare a poly(ether ester) copolymer having a high content of polyether and having a high viscosity without solid-phase polymerization.

Method of preparing poly(ether ester) copolymer

The present application relates to a method for quantitative analysis of a polymer structure. Specifically, the method may be carried out through steps of measuring rheological properties and/or molecular weight distribution of the arbitrarily selected polymer, setting a random value for the selected polymer and then predicting the rheological property and/or the molecular weight distribution of the polymer from the random value, and comparing the measured value with the predicted value to determine the value of the structural parameter of the polymer.

Method for quantitative analysis of polymer structure and analyzer

Super-absorbent polymer and method for preparing same

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 disclosure relates to an ethylene/alpha-olefin copolymer having excellent processibility. The ethylene/alpha-olefin copolymer according to the present disclosure is excellent in both mechanical properties and processibility.

Ethylene/alpha-olefin copolymer having excellent processibility

The present invention relates to an olefin polymer and a preparation method thereof. The olefin polymer exhibits excellent mechanical strength and high processability, and thus is expected to be utilized as a material for various products. Particularly, the olefin polymer can be stably produced into films by a melt-blowing process and thus is expected to be usefully used as a material for products prepared by a melt-blowing process.

The present invention provides an olefin polymer in which LCB (long chain branch) is introduced into mLLDPE (metallocene linear low-density polyethylene) to control the storage modulus, whereby the olefin polymer has excellent bubble stability and processing load characteristics and exhibits excellent processability during preparation of a film, and further has excellent mechanical properties and transparency.

Olefin polymer and method for preparing same

The present invention relates to a method for evaluating the properties of a plastic resin molded product, more specifically to a novel method for evaluating the properties of a plastic resin molded product that can exactly derive impact resistance of practically prepared molded products, using the property measurement values by the existing ASTM.

Method for evaluating properties of plastic resin product

A method of measuring fracture strength of a superabsorbent polymer in order to predict a generation amount of fine powder is provided. Effects of many different treatments for increasing strength of the superabsorbent polymer may be evaluated by measuring a force at a time point when single particles having a uniform particle size of the superabsorbent polymer are fractured by pressurizing the particles at a constant rate within a predetermined range.

Method of measuring fracture strength of single particles of superabsorbent polymer

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Daejeon, South Korea

Sung Hyun Park