Sk Innovation Co., Ltd.

Sk Global Chemical Co., Ltd.

Sk Energy Co., Ltd.

Sabic Sk Nexlene Company Pte. Ltd.

Myung Ahn Ok

Tae Jin Kim

Kwang Jin Chung

Jong Sok Hahn

SAng Hyeon Kang

Sung Seok Chae

Sujith Sudevan

Seung Gweon Hong

Jae Ho Jung

Bun Yeoul Lee

Dae Ho Shin

Sung Jae Na

Taek Kyu Han

Yong Gyu Han

Ji Su Jeong

Ho Seong Lee

Anish Cyriac

Seunggweon Hong

HyeLim Kim

Choon Sik Shim

Hyeong Taek Ham

JaeYoung Park

Tae Woo Woo

Jae Young Park

Min Ho Jeon

Seung Bum Kwon

Young Hyo Park

Jisu Jeong

Dong Cheol Shin

Bunyeoul Lee

Jieun Yoo

Tae-Jin Kim

Ji Yeon Choi

Young Wook Kim

Byoung Tak Yim

Sung-Kwan Kim

Sung-bo Ko

Mal-Ou Lee

Hye Lim Kim

Kang Min Jung

Kodiyan Varghese Jobi

Sung Kwan Kim

Moon Jung Choi

Sung-Jae Na

Jae Koo Kim

Ji Eun Yoo

In Hun Son

Hwan Kyu Jung

Sang Ook Kang

Sung Bo Ko

Mal Ou Lee

Sang Hwan Lee

Seoung Woong Ryu

Mal Woo Lee

Disclosed herein is a method of preparing 1-octene at high activity and high selectivity while stably maintaining reaction activity by tetramerizing ethylene using a chromium-based catalyst system comprising a transition metal or a transition metal precursor, a cocatalyst, and a P&#x2014;C&#x2014;C&#x2014;P backbone structure ligand represented by (R)(R)P&#x2014;(R)CHCH(R)&#x2014;P(R)(R).

Ethylene tetramerization catalyst system and method for preparing 1-octene using the same

Ethylene tetramerization catalyst systems and method for preparing 1-octene using the same

A polyalkylene carbonate resin composition with interpenetrating network structure includes an aliphatic polycarbonate obtained through a reaction of carbon dioxide with at least one epoxide compound selected from the group consisting of (C2-C10)alkylene oxide substituted or unsubstituted with halogen or alkoxy, (C4-C20)cycloalkylene oxide substituted or unsubstituted with halogen or alkoxy, and (C8-C20)styrene oxide substituted or unsubstituted with halogen, alkoxy, alkyl or aryl, at least one compound selected from a polyol compound, an epoxy compound and an acryl compound, and a curing agent for polymerization or networking.

Polyalkylene carbonate resin composition having an interpenetrating crosslinked structure

The present invention relates to a poly(alkylene carbonate) capsule in which a heterogeneous resin is applied on a surface of poly(alkylene carbonate), and a method of manufacturing the same, and provides a poly(alkylene carbonate) capsule preventing blocking where particles agglomerate each other when a resin having surface stickiness at a glass transition temperature or higher is processed in a pellet or chip state and circulated, and a method of manufacturing the same.

Method of encapsulating poly(alkylene carbonate) and mixture particles thereof, and use thereof

The present invention relates to a method of manufacturing a polycarbonate including the process of copolymerizing epoxide compound and CO2 using cobalt(III) or chromium(III), where the ligands contains at least 3 ammonium cations, central metal has formal &#x2212;1 charge, and conjugated anions of the two cationic ammonium groups are acid-base homoconjugation, as catalyst. According to the present invention, the initial induction time can be reduced when the polycarbonate is manufactured and it is possible to improve the activity of the catalyst and the molecular weight of the obtained polymer.

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Provided herein are a method for preparing a resin composition for an expandable polypropylene carbonate and an expandable polypropylene carbonate prepared therefrom. More particularly, the present invention relates to a method for preparing a resin composition for an expandable polypropylene carbonate capable of using supercritical carbon dioxide as a foaming agent and preparing a foam having excellent moldability by an appropriate foaming method, and an expandable polypropylene carbonate prepared therefrom. The expandable polypropylene carbonate capable of having high magnification, excellent thermal stability, and dimensional stability may be prepared by using the resin composition according to the present invention.

Method for preparing resin composition for expandable polypropylene carbonate and expandable polypropylene carbonate prepared therefrom

Provided is preparation of poly(alkylene carbonate) through alternating copolymerization of carbon dioxide and epoxide. According to the disclosure, by introducing a diepoxide compound to alternating copolymerization of carbon dioxide and epoxide compound using a metal(III) prepared with salen-type ligands containing quaternary ammonium salt as a catalyst, some of the polymer chains may be cross-linked to thus increase an average molecular weight of the copolymer and extend a distribution of molecular weight. A resin prepared according to this method may have high mechanical strength and rheological advantages.

Preparation of poly(alkylene carbonate) containing cross-linked high molecular weight chains

Provided is a method for improving thermal stability of polypropylene carbonate and, more particularly, a method of end capping a molecular chain of polypropylene carbonate using a urethane group by adding isocyanates or diisocyanates to a polypropylene carbonate resin, which may optionally be a mixture containing tertiary polyol, so as to delay thermal degradation of the polypropylene carbonate at a high temperature, thereby securing desired thermal stability. Especially, the method capable of being easily applied to reactive extrusion after preparing the polypropylene carbonate has been proposed, thus simplifying production processes and ensuring economical advantages. Moreover, the above method does not deteriorate transparency and specific smoke density characteristics at combustion, which are advantages of the polypropylene carbonate.

Method for improving thermal stability of polypropylene carbonate

Provided is an eco-friendly poly(propylene carbonate) resin composition for a sheet, which is characterized by using a poly(alkylene carbonate) resin developed by efficiently utilizing carbon dioxide, which is a major contributor to global warding, as a main material, and including appropriate additives, such as, a strength modifier, and a flexibilizer, thereby completely solving environmental hazards controversy of the existing polyvinyl chloride resin products; exhibiting excellent mechanical and thermal properties, processability, post processability (printability, embossing and surface treatment, laminating characteristics) and superior anti-flaming property (low smoke density) and elongation characteristics as compared with the existing polyvinyl chloride resin products; and overcoming an extruding production method which is a small-sized production manner, corresponding to a big defect in thermoplastic plastics emerged as substitutes for polyvinyl chloride resin products and thus applying a calendering process method which is a mass production manner.

Eco-friendly poly(alkylene carbonate) resin composition for high-transparency and high-gloss sheet

Disclosed herein is a group IV transition metal catalyst for producing an ethylene homopolymer or an ethylene-olefin copolymers, having high catalytic activity, which includes a cyclopentadiene derivative and one or more anionic ligands having an aryl group substituted with an aryl derivative at an ortho-position thereof around a transition metal, the ligands not being crosslinked to each other, a catalyst system including the group IV transition metal catalyst and an aluminoxane cocatalyst or a boron compound cocatalyst, and a method of producing ethylene homopolymers or ethylene-olefin copolymers using the catalyst system.

Transition metal catalytic systems and methods for preparing ethylene homopolymers or copolymers of ethylene and olefins using the same

Disclosed are an ethylene polymerization process, a catalyst for use in the process, a production method employing the catalyst, and a product produced thereby. More specifically, disclosed is a process of producing an ethylene copolymer from ethylene and an alpha-olefin comonomer, in which the produced ethylene copolymer has a multimodal molecular weight distribution and excellent processability and physical properties, and thus can increase the value and productivity of products, including pipes and films. Particularly, the produced ethylene copolymer has a trimodal or higher molecular weight distribution or density distribution, and thus, when it is a linear low-density copolymer, it has an excellent effect of improving the impact strength of films, and when it is a medium-density ethylene copolymer, it can be produced into pipes, which have slow crack growth rate and can be used even at high temperature.

Ethylene copolymer having multiple pitch in molecular weight distribution and the method of preparing the same

This invention relates to a Salen type ligand including three or more quaternary ammonium salts of nitrate anions, to a trivalent metal complex compound prepared from this ligand and a method of preparing the same, to a method of preparing polycarbonate by copolymerizing an epoxide compound and carbon dioxide using the complex compound as a catalyst, and to a method of separating and collecting the catalyst from the copolymer after copolymerization. This catalyst used to copolymerize an epoxide compound and carbon dioxide can be more simply prepared, and has lower catalyst preparation and recovery costs, and higher activity, compared to conventional catalysts.

The present invention relates to a multilayer film coextruded from an aliphatic polycarbonate and polylactic acid-based polymer and a method for producing the same. According to the present invention, a multilayer film having excellent adhesive property can be manufactured even without a separate adhesive layer.

Multilayer film

Growing community of inventors

Daejeon, South Korea

Myung Ahn Ok