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Ethylene/alpha-olefin copolymer

An olefin copolymer, a technology of the copolymer, applied in the field of ethylene/α-olefin copolymer, can solve the problems such as high density polyethylene that has not been properly developed and supplied

Pending Publication Date: 2019-06-14
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Nevertheless, HDPE exhibiting sufficient environmental stress crack resistance has not been properly developed and available

Method used

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  • Ethylene/alpha-olefin copolymer
  • Ethylene/alpha-olefin copolymer
  • Ethylene/alpha-olefin copolymer

Examples

Experimental program
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preparation example Construction

[0199]

[0200] Synthesis Example 1: Synthesis of the first metallocene compound

[0201]

[0202] 1-1. Preparation of Ligand Compounds

[0203] 2.331 g (10 mmol) of indenoindole was added to a dry 250 mL Schlenk flask, and 40 mL of diethyl ether was injected under argon. The ether solution was cooled to 0°C, and then 4.8 mL (12 mmol) of 2.5M nBuLi hexane solution was slowly added dropwise thereto. The reaction mixture was slowly warmed to room temperature, then stirred until the next day. 20 mL of diethyl ether was charged into another 250 mL Schlenk bottle, and then 3.6 mL (30 mmol) of dichloromethyl(tert-butoxyhexyl)silane was injected. The flask was cooled to -78°C, and the lithiated solution of indenoindole was injected into it through a cannula. After the injection was complete, the mixture was slowly warmed to room temperature and then stirred for about 5 hours and then for a day. Then, the flask was quenched by adding 50 ml of water, the organ...

preparation Embodiment 1

[0224] Preparation Example 1: Preparation of Supported Catalyst

[0225] 50 mL of toluene solution was added to a 300 mL glass reactor, 10 g of dry silica (SP 2410, manufactured by Grace Davison (Grace-Davidson)) was added thereto, and then the temperature of the reactor was raised to 40° C. Stir simultaneously. 60 mL of a 10% by weight methylaluminoxane (MAO) / toluene solution was added thereto. After raising the temperature to 60°C, the mixture was stirred at 200 rpm for 12 hours. After the temperature of the reactor was lowered to 40° C., stirring was stopped and settling was performed for 10 minutes, and then the reaction solution was decanted. 100 mL of toluene was added thereto again and stirred for 10 minutes. Stirring was stopped and settling was performed for 10 minutes, and the toluene solution was decanted.

[0226] 50 mL of toluene was added to the reactor, 0.50 g of the metallocene compound of Synthesis Example 1 as a high molecular weight catalyst pre...

Embodiment 1

[0230] The catalyst was prepared by measuring 50 mg of the supported catalyst prepared in Preparation Example 1 in a dry box, putting it into a 50 mL glass bottle, sealing it with a rubber septum, and taking the bottle out of the dry box. Polymerization was carried out in a 2 L metal alloy reactor equipped with a mechanical stirrer capable of temperature control and used under high pressure.

[0231] 1 L of hexane containing 1.0 mmol of triethylaluminum and 8 mL of 1-butene were put into a reactor, and the supported catalyst prepared above was added into the reactor without contact with air, at 80 °C and 10Kgf / cm 2 Polymerization was carried out for 1 hour while continuously supplying ethylene monomer gas under a pressure of . The polymerization was terminated by first stopping the stirring, and venting and removing the ethylene gas. The polymerization solvent was removed from the obtained polymer by filtering it, and the polymer was dried in a vacuum oven at 80° C. for...

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PUM

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Abstract

The present invention relates to an ethylene / alpha-olefin copolymer and, more particularly, to an ethylene / alpha-olefin copolymer that exhibits excellent resistance to environmental stress cracking due to the ratio of crystal structure domain to amorphous domain being appropriately controlled. The ethylene / alpha-olefin copolymer comprises an ethylene repeating unit and an alpha-olefin repeating unit, and has a crystal structure comprising a crystalline domain comprising lamellar crystals and an amorphous domain comprising a linking molecule that mediates bonding between the lamellar crystals,wherein the thickness (dc) of the lamellar crystals calculated from the result of Small Angle X-ray Scattering (SAXS) analysis is between 12.0 and 16.0 nm, the thickness (da) of the amorphous domain is between 4.0 and 5.3 nm, and the thickness ratio calculated from the formula da / dc is between 0.3 and 0.4.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of the filing date of Korean Patent Application No. 10-2016-0148267 filed with the Korean Intellectual Property Office on Nov. 08, 2016, the entire contents of which are incorporated herein by reference. [0003] The present invention relates to an ethylene / α-olefin copolymer exhibiting excellent environmental stress crack resistance. Background technique [0004] Polyethylene, mainly composed of ethylene / α-olefin copolymers, is a typical semi-crystalline polymer material and is widely used in various industrial applications. Specifically, polyethylene, for example, high-density polyethylene is commonly used in various applications such as molding or forming various containers such as paint containers or food containers, or molding or forming various pipes such as gas lines. In particular, high-density polyethylene has many advantages, such as light weight, exhibit...

Claims

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Application Information

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IPC IPC(8): C08F210/02C08L23/08C08L23/16
CPCC08F210/16C08F4/65927C08F4/65916C08F4/65912C08F210/08C08F4/65904C08F2420/06C08F2420/10C08F2420/07C08F2500/02C08F2500/13C08F4/65925C08F210/02C08L23/08C08L23/16C08F2500/18
Inventor 李政圭朴范硕宋仁永吴诚濬崔二永宣淳浩
Owner LG CHEM LTD
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