Samsung General Chemicals, Co., Ltd.

Samsung Atofina Co., Ltd.

Young-Sub Lee

Xuequan Zhang

Youn-Kyung Kang

Sung-Cheol Yoon

Jae-Gon Lim

Hyun-Joon Kim

Sang-Sun Woo

The supported catalyst according to the present invention comprises a support of organic or inorganic powder with a high-surface area, a polymer coated onto the support and a metallocene catalyst. The polymer ( ) contains polar groups; ( ) interacts with the surface of the support; and ( ) is insoluble in the styrenic monomer or polymerization solvent during polymerization after the catalyst is loaded. The polymer is located between the support and the metallocene catalyst such that the polymer insulates the metallocene layer from the support layer to prevent poisoning of the metallocene catalyst layer by the support layer. The styrenic polymer powder such produced by the present invention has good flow-ability and good morphology demonstrating a great deal of industrial applicability.

Supported catalyst for producing syndiotactic styrenic polymer with high productivity and significantly reduced reactor fouling

Catalyst for polymerization or copolymerization of olefin

The present invention relates to a polymerization process for preparing syndiotactic polystyrenes, which comprises a step of microfluidizing in a microfluidization apparatus both a catalyst mixture consisting of a styrene monomer, a metallocene catalyst and an inert organic solvent and a cocatalyst mixture consisting of a styrene monomer, a cocatalyst and an inert organic solvent, and a step of reacting the microfluidized mixture with a catalyst and a cocatalyst in a reactor. The metallocene catalyst has a bridged structure of a complex of Group IV transition metals such as Ti, Zr, Hf etc. in the Periodic Table and a ligand having one or two cycloalkane dienyl groups such as cyclopentadienyl group, indenyl groups, fluorenyl group, and derivatives thereof. The reactor is a well stirred reactor equipped with agitating blades therein to mix the reactants well. In this invention, the plural number of reactors can be employed in series for more effective polymerization, and the plural number of microfluidization apparatuses can be employed in parallel.

Polymerization process for preparing syndiotactic polystyrenes through microfluidization

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Taejeon, South Korea

Young-Sub Lee