Lotte Chemical Corporation

Byung Hun Chae

Joon Keun Min

Hyun Yul Woo

Eun Hye Shin

Rai Ha Lee

Sung Won Jung

Su Jeong Jeong

Youn Jin Hong

Jung Yeop Lee

Seong Soo Lim

Sook Young Jin

Hae In Lee

Cheon Ik Joo

The present invention relates to a supported catalyst for propylene polymerization in which a first transition metal compound contributing to the production of crystalline polypropylene and a second transition metal compound contributing to the production of rubbery polypropylene are co-supported, and a method for producing a polypropylene resin using same. By using the supported catalyst, according to the present invention, it is possible to produce, by a single step of propylene polymerization, a polypropylene resin in which crystalline polypropylene and rubbery polypropylene are simultaneously formed.

Supported catalyst for propylene polymerization and method for producing polypropylene resin using same

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.

Method of three-dimensional printing

This disclosure relates to a method for preparing a catalyst for synthesis of a polyolefin and a process for synthesis of a polyolefin using the same. More particularly, this disclosure relates to a method for preparing a catalyst for synthesis of a polyolefin including: reacting a magnesium compound with an alkane diol having a carbon number of 3 to 15 unsubstituted or substituted with an alkyl group having a carbon number of 1 to 5, and a benzoyl halide compound to prepare a magnesium compound solution; reacting the magnesium compound solution with a first transition metal compound to prepare a support; and reacting the support with a second transition metal compound to produce a solid catalyst, and a process for synthesis of a polyolefin using the same.

Growing community of inventors

Daejeon, South Korea

Byung Hun Chae