Lotte Chemical Corporation

Jung Yeop Lee

Byung Hun Chae

Sung Won Jung

Hyun Yul Woo

Youn Jin Hong

Seong Soo Lim

Cheon Ik Joo

Sook Young Jin

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.

Preparation method of catalyst for polymerization of polyolefin and process for polymerization of polyolefin using the same

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Daejeon, South Korea

Jung Yeop Lee