Lotte Chemical Corporation

Youn Jin Hong

Sung Won Jung

Byung Hun Chae

Hyun Yul Woo

Joon Keun Min

Rai Ha Lee

Eun Hye Shin

Jung Yeop Lee

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 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.

Method of three-dimensional printing

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Daejeon, South Korea

Youn Jin Hong