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Homopolypropylene and preparation method therefor

A homopolypropylene, weight-average molecular weight technology, applied in the direction of textiles, papermaking, non-woven fabrics, etc., can solve the problems of lack of proper development of homopolypropylene, insufficient processability, strength deterioration, etc., and achieve excellent processability, roughness Texture, effect of improving mechanical properties

Active Publication Date: 2019-10-25
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when producing homopolypropylene using a previously developed metallocene catalyst, there is a disadvantage that the viscosity during processing is so high that the processability is insufficient, or conversely, the viscosity during processing is sufficient to ensure processability but the strength deteriorates
[0009] Therefore, homopolypropylene with improved processability and mechanical properties such as strength has not been properly developed so far.

Method used

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  • Homopolypropylene and preparation method therefor
  • Homopolypropylene and preparation method therefor
  • Homopolypropylene and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

comparative preparation Embodiment 1

[0158] Step 1: Preparation of transition metal compound

[0159]

[0160] The catalyst of the above chemical formula is prepared by the following method.

[0161] 2-Methyl-4-tert-butylphenylindene (20.0g, 76mmol) was dissolved in toluene / THF=10 / 1 (230mL), and the n-butyllithium solution (2.5 M, hexane solvent, 22 g), and stirring was performed at room temperature for one day. Then, (6-tert-butoxyhexyl)dichloromethylsilane (1.27 g) was slowly added dropwise to the mixed solution at -78°C, stirred for about 10 minutes, and stirred at room temperature for one day. Then, water was added to separate the organic layer, and the solvent was distilled off under reduced pressure to obtain (6-tert-butoxyhexyl)(methyl)-bis(2-methyl-4-tert-butylphenylindenyl)silane.

[0162] Dissolve the pre-prepared (6-tert-butoxyhexyl)(methyl)-bis(2-methyl-4-phenyl)indenylsilane in a solution of toluene / THF=5 / 1 (95mL), in At -78°C, n-butyllithium solution (2.5M hexane solvent, 22g) was slowly added dropwise,...

comparative preparation Embodiment 2

[0166] Step 1: Preparation of transition metal compound

[0167]

[0168] The catalyst of the above formula is prepared by the following method.

[0169] A 250 mL Schlenk flask was charged with 7-tert-butylphenyl-2-methylindene (34.4 mmol) and dried under reduced pressure. Under an argon atmosphere, anhydrous toluene / THF (172 / 34mL) was added for dilution, and then 2.5M n-BuLi hexane solution (36.2mmol, 14.5mL) was slowly added at -25°C. Stir at 25°C for 4 hours or more, add Et to the reactants 2 SiCl 2 (17.2 mmol) and stirring at 25°C overnight. Use a separatory funnel to extract MTBE and H 2 O, then MgSO 4 Add to the organic layer to dry the remaining water. The solid was filtered out with a reduced pressure filter, and the liquid was distilled under reduced pressure to concentrate.

[0170] (Diethylsilane-diyl)-bis(2-methyl-4-(4-tert-butyl-phenyl)indenyl)silane (10.7 mmol) was added to a 100 mL Schlenk flask and dried under reduced pressure. Under an argon atmosphere, anhydrous...

comparative preparation Embodiment 3

[0174] Step 1: Preparation of transition metal compound

[0175]

[0176] The catalyst of the above formula is prepared by the following method.

[0177] A 250 mL Schlenk flask was charged with 7-tert-butylphenyl-2-isopropylindene (10.0 g, 34.4 mmol) and dried under reduced pressure. Under an argon atmosphere, anhydrous ether (172 mL) was added for dilution, and a 2.5M n-BuLi hexane solution (36.2 mmol, 14.5 mL) was slowly added at -25°C. After stirring at 25°C for 4 hours or more, the Me 2 SiCl 2 (68.9 mmol, 8.30 mL) was added to the reaction and stirred at 25°C overnight. LiCl was filtered out using a G4 size glass filter, and the filtrate was dried under reduced pressure. To another 250 mL Schlenk flask was added 7-tert-butylphenyl-2-methylindene (9.04 g, 34.4 mmol) and CuCN (1.72 mmol, 0.15 g) and dried under reduced pressure. Under argon atmosphere, add anhydrous toluene (208mL) and THF (20.4mL) to dilute, slowly add 2.5M n-BuLi hexane solution (36.2mmol, 14.5mL) at -25℃, a...

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Abstract

The present invention provides: homopolypropylene exhibiting excellent processability and an excellent mechanical property, such as high strength, and the like; and a preparation method therefor. Thehomopolypropylene has i) a molecular weight distribution of less than 2.4, ii) a melting index (measured by a load of 2.16 kg at 230 DEG C according to ASTM D1238) of 5-3000 g / 10 min, iii) a residualstress ratio of 0.5% or less, and iv) a complex viscosity of 5-600 Pa.s at an angular frequency of 1 rad / s, and satisfies a complex viscosity of 5-300 Pa.s at an angular frequency of 100 rad / s.

Description

Technical field [0001] Cross references to related applications [0002] This application requires Korean Patent Application No. 10-2017-0180271 filed with the Korean Intellectual Property Office on December 26, 2017 and Korean Patent Application No. 10-2018-0133853 filed with the Korean Intellectual Property Office on November 2, 2018 The priority and rights of, the entire contents of which are incorporated herein by reference. [0003] The present invention relates to homopolypropylene with improved mechanical properties and excellent processability and a preparation method thereof. Background technique [0004] Olefin polymerization catalyst systems can be divided into Ziegler-Natta catalyst systems and metallocene catalyst systems, and these highly active catalyst systems have been developed according to their characteristics. Ziegler-Natta catalysts have been widely used in existing industrial processes since they were developed in the 1950s. However, because the Ziegler-Natt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/06C08F2/44C08K5/13C08K5/49D04H1/4291C08F4/659C08F4/6592C08F4/646C08F4/642
CPCC08F2/44C08F4/642C08F4/646C08F4/659C08F4/6592C08F110/06C08K5/13C08K5/49D04H1/4291C08F4/65912C08F4/65916C08F4/65927C08F2500/17C08F2500/03C08F2500/12C08F2500/34C08F2500/35C08F2410/02C08F2420/01D04H3/007C08F4/61927
Inventor 金太镇朴荷娜蔡成旼郑寅用李大然芮志和朴喜廣
Owner LG CHEM LTD
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