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Novel multinuclear half metallocene catalyst and preparation of styrene polymer using the same

A semi-metallic and styrene technology, applied in metallocenes, titanium organic compounds, organic chemistry, etc., to achieve good stereoregularity and high polymerization activity

Inactive Publication Date: 2003-12-31
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the co-ligand used has a symmetrical structure and acts as a leaving group during polymerization, the obtained polystyrene is indistinguishable from that obtained using mononuclear metallocene complex catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] (O i Pr) 3 Ti[Cp(CH 2 ) 6 O]TiCp * (OMe) 2 Synthesis

[0086] ((C 5 h 4 )(CH 2 ) 6 Preparation of OH)

[0087] 1.81g (10mmol) Br(CH 2 ) 6 Add 30ml tetrahydrofuran (THF) to a 250ml Schlenk bottle of OH for dissolution, and use ice / acetone mixed refrigerant to lower the reactor temperature to -78°C, and then slowly inject 1.2 equivalents of NaCp dissolved in THF with a syringe. The reaction solution was stirred at the current temperature for 30 minutes, then the temperature was slowly increased and kept at room temperature, and the reaction solution was stirred overnight to obtain a light purple solution.

[0088] Inject 30 ml of NH into the reaction mixture 4 Cl saturated aqueous solution to terminate the reaction, then extracted twice with 50ml diethyl ether, the resulting organic solution was washed with anhydrous magnesium sulfate (MgSO 4 ) to remove water, filter, and remove the solvent in a rotary evaporator. The solution was dried in vacuo to obtain...

Embodiment 2

[0096] (O i Pr) 3 Ti[Cp(CH 2 ) 9 O]TiCp * (OMe) 2 Catalyst Synthesis

[0097] (O i Pr) 3 Ti[Cp(CH 2 ) 9 O]TiCp * (OMe) 2 Catalyst is prepared by the same method in embodiment 1, just with Br(CH 2 ) 9 OH replaced Br(CH 2 ) 6 Oh.

Embodiment 3

[0099] (O i Pr) 3 Ti[Cp(CH 2 ) 12 O]TiCp * (OMe) 2 Catalyst Synthesis

[0100] (O i Pr) 3 Ti[Cp(CH 2 ) 12 O]TiCp * (OMe) 2 Catalyst is prepared by the same method in embodiment 1, just with Br(CH 2 ) 12 OH replaced Br(CH 2 ) 6 Oh.

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Abstract

The present invention relates to a catalyst for preparing vinyl aromatic polymer and styrene polymerization using the same, and particularly to a transition metal half metallocene catalyst with a novel structure for preparing syndiotactic styrene polymer having high activity, superior stereoregularity, high melting point and various molecular weight distributions and a process for preparing styrene polymer using the same. The present invention provides a multinuclear half metallocene compound in which two or more of transition metals of groups 3 to 10 on periodic table are connected through bridge ligand simultaneously containing Pi-ligand cycloalkandienyl group and Alpha-ligand functional group and its preparation, and a process for preparing styrene polymer using the compound as a catalyst. Polymers with various molecular weight distributions as well as vinyl aromatic polymer having predominant syndiotactic structure can be prepared with high activity using the multinuclear half metallocene catalyst.

Description

technical field [0001] The invention relates to a catalyst for preparing vinylene aromatic polymers and a styrene polymerization process using the catalyst, in particular to a syndiotactic compound with high activity, excellent stereoregularity, high melting point and multiple molecular weight distributions. Novel structural transition metal semimetallocene complex catalyst for styrene polymer and polymer preparation process using this catalyst. Background technique [0002] Styrene polymers are mainly divided into three categories according to the arrangement of benzene rings connected to the polymer backbone: irregular, isotactic and syndiotactic polystyrene. [0003] Amorphous irregular polystyrene is a thermoplastic polymer obtained by conventional free-radical or ionic polymerization. It is prepared by different processes such as injection molding, extrusion molding or vacuum forming, etc., and is used as packaging materials, casing materials for daily necessities, toy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F4/60C07F17/00C08F4/642C08F4/6592C08F4/76C08F12/00C08F12/04
CPCC07F17/00C08F12/08C08F2420/04C08F4/65912C08F2410/03C08F4/6592C08F4/60
Inventor 李敏炯郑有美柳真英
Owner LG CHEM LTD
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