Method for preparing polyolefin and polyolefin prepared thereby

A technology for polyolefins and olefin monomers, applied in the field of polyolefins, can solve the problems of poor processability, uneven surface, and reduced bubble stability of polyolefins.

Active Publication Date: 2016-06-22
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a disadvantage that polyolefins prepared using metallocene catalysts show poor processability due to narrow molecular weight distribution
Polyolefins produced by metallocene catalysts exhibit high viscosity at high shear rates due to relatively narrow molecular weight distribution, etc., and thus have the following disadvantages: high load or pressure is applied during extrusion to reduce extrusion productivity, Bubble stability is greatly reduced during processing, and blown products have uneven surfaces that reduce transparency
[0006] However, due to the high reactivity of metallocene catalysts, proper polymerization cannot occur in the latter reactor due to the polymerization time in the former reactor
As a result, it is difficult to prepare polyolefins satisfying both high molecular weight and broad multimodal molecular weight distribution

Method used

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  • Method for preparing polyolefin and polyolefin prepared thereby
  • Method for preparing polyolefin and polyolefin prepared thereby
  • Method for preparing polyolefin and polyolefin prepared thereby

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0178] [t-Bu-O(CH 2 ) 6 -C 5 H 4 ] 2 ZrCl 2 Synthesis

[0179] The preparation of tert-butyl-O-(CH 2 ) 6 -Cl, and make it with NaC 5 h 5 reaction to obtain tert-butyl-O-(CH 2 ) 6 -C 5 h 5 (Yield: 60%, b.p. 80°C / 0.1 mmHg).

[0180] At -78°C, 2.0 g (9.0 mmol) tert-butyl-O-(CH 2 ) 6 -C 5 h 5 It was dissolved in THF, and 1.0 equivalent of n-butyllithium (n-BuLi) was slowly added thereto. The temperature was raised to room temperature, and the reaction was allowed to proceed for 8 hours. At -78 °C, the reaction solution was slowly added to the ZrCl 4 (THF) 2(1.70 g, 4.50 mmol) / THF (30 mL) suspension, and then further reacted at room temperature for 6 hours to obtain a final reaction solution.

[0181] The reaction solution was dried under vacuum to remove all volatile materials, then hexane was added to the remaining oily liquid, followed by filtration using a Schlenk glass filter. The filtrate was dried under vacuum to remove the solvent...

Synthetic example 2

[0185]

[0186] 2-1. Preparation of Ligand Compounds

[0187] 2 g of fluorene was dissolved in 5 mL of MTBE, 100 mL of hexane, and then 5.5 mL of a 2.5 M n-BuLi hexane solution was added dropwise thereto in a dry ice / acetone bath, followed by stirring overnight at room temperature. Dissolve 3.6 g of (6-(tert-butoxy)hexyl)dichloro(methyl)silane in 50 mL of hexane, and transfer the fluorene-Li slurry in a dry ice / acetone bath for 30 min, followed by stirring overnight at room temperature . Simultaneously, 5,8-dimethyl-5,10-dihydroindeno[1,2-b]indole (12mmol, 2.8g) was dissolved in 60mL THF and poured into it gradually in a dry ice / acetone bath 5.5 mL of 2.5M n-BuLi hexane solution was added dropwise, followed by stirring overnight at room temperature. NMR sampling of the reaction solution of fluorene and (6-(tert-butoxy)hexyl)dichloro(methyl)silane was performed to verify the completion of the reaction, and then 5,8-dimethyl-5 , 10-dihydroindeno[1,2-b]indole-Li solution ...

Synthetic example 3

[0193]

[0194] 3-1. Preparation of Ligand Compounds

[0195] 2.1 g (9 mmol) of 5,8-dimethyl-5,10-dihydroindeno[1,2-b]indole was added to a 250 mL flask in which the atmosphere had been replaced with an argon atmosphere, and dissolved in 50 mL of THF . Thereto was added dropwise 3.9 mL (9.75 mmol) of a 2.5 M n-BuLi hexane solution in a dry ice / acetone bath, followed by stirring overnight at room temperature. Thus, a yellow slurry was obtained. A further 50 ml of hexane was injected, and 1.35 g of (6-(tert-butoxy)hexyl)dichloro(methyl)silane was added dropwise using a syringe in a dry ice / acetone bath, and the temperature was raised to room temperature, followed by stirring overnight . A small amount of reaction product was sampled to verify completion of the reaction by 1H-NMR. The solvent was dried under vacuum, then the resulting solid was dissolved in 70 ml toluene and filtered to remove LiCl. The resulting filtrate was used as such for metallization.

[0196] 1...

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Abstract

The present invention relates to a polyolefin preparation method capable of more effectively preparing polyolefin which is preferably useful for blow-molding or the like since the polyolefin has high molecular weight and multimodal molecular weight distribution, and to polyolefin prepared thereby.

Description

technical field [0001] The present invention relates to a process for the production of polyolefins and polyolefins produced thereby, wherein said process is used for the more efficient production of polyolefins having high molecular weight and multimodal molecular weight distribution, preferably for blow molding and the like. Background technique [0002] In general, blow molded products are required to have excellent processing properties, mechanical properties and environmental stress cracking resistance. Therefore, there is a need for techniques for preparing polyolefins satisfying high molecular weight, broad multimodal molecular weight distribution, and uniform comonomer distribution, preferably for blow molding and the like. [0003] Meanwhile, since metallocene catalysts containing Group 4 transition metals are used to easily control the molecular weight and molecular weight distribution of polyolefins, as well as control the comonomer distribution of polymers, compa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/00C08F4/6592C08F4/642C08F2/38
CPCC08F10/00C08F4/65912C08F4/65916C08F2420/06C08F2410/01C08F2420/10C08F2420/07C08F2/38C08F210/16C08F210/14C08F2500/01C08F2500/05C08F2500/12C08F2/001C08F4/65925C08F4/65927C08F4/65904C08F2/04C08F4/642C08F2410/03C08F10/02
Inventor 赵京珍李龙湖李琪树赵敏硕金世英李承珉朴珍映
Owner LG CHEM LTD
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