Lotte Chemical Corporation

Hyun Yul Woo

Byung Hun Chae

Joon Keun Min

Sung Won Jung

Eun Hye Shin

Rai Ha Lee

Youn Jin Hong

Su Jeong Jeong

Jung Yeop Lee

Disclosed is a method using a metallocene catalyst system so as to control the polymer structure of a diene-modified polypropylene through process simplification, thereby being capable of preparing a hyperbranched polypropylene resin having a low gel content and improved melt strength. The present invention provides a method using a catalyst so as to polymerize propylene and a diene compound, thereby preparing a diene-modified polypropylene resin having a branching index of 0.95 or less, a gel content of 3 wt % or less and an advanced rheometric expansion system (ARES) melt strength of 5 g or more.

Method for preparing high-melt-strength polypropylene resin

Disclosed are a polyolefin having a high molecular weight by using a novel metallocene catalyst; a method for preparing the polyolefin by using the same; and a method for preparing an ethylene-propylene random copolymer having high molecular weight, high syndiotacticity and small crystal size, thereby providing injection molded articles with improved transparency. The present invention provides a transition metal compound represented by chemical formula 1: 

Polyolefin catalyst and method for preparing polyolefin by using same

Disclosed are a novel metallocene catalyst and a method for preparing a polyolefin having a high molecular weight and a low melt index by using the same. The present invention provides a transition metal compound represented by formula 1.

Polyolefin catalyst and method for preparing polyolefin using same

Disclosed is a propylene-diene copolymer resin having excellent melt tension, with improved melt strength, high molecular weight and broad molecular weight distribution by using a specific metallocene catalyst system. The present invention provides a propylene-diene copolymer resin produced by polymerizing propylene and a diene compound of C4-C20 by using a metallocene catalyst system, wherein the propylene-diene copolymer resin has the melt index (2.16 kg load at 230&#xb0; C.) of 0.1-100 g/10 min and the melt tension (advanced rheometric expansion system (ARES)) of 5-100 g.

Propylene-diene copolymer resin having excellent melt tension

A method of three-dimensional (3D) printing, the method including: heating a composition comprising a polymer base including atactic polypropylene having a weight average molecular weight of 50,000 to 1,000,000, a density of 0.8 to 0.9 g/ml, and isotacticity (Pentad I.I, mmmm) of 5 to 20%, wherein a melting index (210&#xb0; C., 2.16 kg) of the polymer base is 0.5-30 g/10 minutes; extruding the composition as a filament; and applying the extruded filament in one or more layers, wherein a solidification rate (measuring melting indexes (MI, 150&#xb0; C., 10 kg)) of the filament is less than or equal to 2 g/10 minutes and a melting rate (measuring melting indexes (MI, 180&#xb0; C., 10 kg)) of the filament is greater than or equal to 10 g/10 minutes, and hardness of the polymer base is less than or equal to Shore A 90.

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Daejeon, South Korea

Hyun Yul Woo