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Polyethylene and chlorinated polyethylene thereof

A polyethylene and chemical formula technology, applied in the field of polyethylene and its chlorinated polyethylene, can solve the problems of low chlorine distribution uniformity, insufficient impact strength, etc., and achieve short relaxation time, excellent chlorination productivity, and glass transition temperature excellent effect

Active Publication Date: 2020-12-15
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of currently known general-purpose chlorinated polyethylene, since polyethylene prepared by a Ziegler-Natta catalyst is used, the chlorine distribution in the polyethylene is limited due to a broad molecular weight distribution and a high content of ultra-high molecular weight. Reduced uniformity
There is also a disadvantage of insufficient impact strength when blended with PVC

Method used

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  • Polyethylene and chlorinated polyethylene thereof
  • Polyethylene and chlorinated polyethylene thereof
  • Polyethylene and chlorinated polyethylene thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0073] The method for preparing polyethylene according to the present disclosure may include the steps of: at least one first metallocene compound represented by the following Chemical Formula 1; and at least one second metallocene compound selected from the compounds represented by the following Chemical Formula 3 Polymerize ethylene in the presence of:

[0074] [chemical formula 1]

[0075]

[0076] In Chemical Formula 1,

[0077] Q 1 and Q 2 The same or different from each other, and each independently hydrogen, halogen, C 1-20 Alkyl, C 2-20 Alkenyl, C 2-20 Alkoxyalkyl, C 6-20 Aryl, C 7-40 Alkylaryl or C 7-40 Arylalkyl;

[0078] A 1 is carbon (C), silicon (Si) or germanium (Ge);

[0079] m 1 is a Group 4 transition metal;

[0080] x 1 and x 2 are the same or different from each other, and are independently halogen, C 1-20 Alkyl, C2-20 Alkenyl, C 6-20 Aryl, nitro, amino, C 1-20 Alkylsilyl, C 1-20 Alkoxy or C 1-20 sulfonate groups; and

[0081] C 1 an...

preparation Embodiment 1

[0249] Preparation Example 1: Preparation of Supported Catalyst

[0250] 5.0 kg of toluene solution was added to a 20 L stainless steel (sus) high pressure reactor, and the temperature of the reactor was kept at 40°C. After adding 1,000 g of silica (SP948, manufactured by Grace Davison) dehydrated at a temperature of 600° C. in vacuum for 12 hours to the reactor, and fully dispersing the silica, 25 g of the ethylene oxide of Synthesis Example 2 was dissolved in toluene. A metal compound was added thereto, and then reacted at 40°C for 2 hours while stirring at 200 rpm. Thereafter, stirring was stopped, followed by settling for 30 minutes, and then the reaction solution was decanted.

[0251] 2.5 kg of toluene was added to the reactor, and 9.4 kg of a 10 wt % methylaluminoxane (MAO) / toluene solution was added thereto, followed by stirring at 200 rpm at 40° C. for 12 hours. Thereafter, stirring was stopped, followed by settling for 30 minutes, and then the reaction solution was...

comparative preparation Embodiment 1

[0255] Comparative preparation example 1: the preparation of supported catalyst

[0256] In addition to using the metallocene compound of Comparative Synthesis Example 1 instead of the metallocene compound of Synthesis Example 1, and the weight ratio of the metallocene compound of Comparative Synthesis Example 1 and the metallocene compound of Synthesis Example 2 is 50:50, with A supported hybrid catalyst was prepared in the same manner as in Preparation Example 1.

[0257] [Preparation of polyethylene]

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Abstract

Polyethylene, according to the present invention, has a short stress relaxation time and a uniform particle size, and thus, it is possible to produce chlorinated polyethylene having excellent chlorination productivity and a glass transition temperature by reacting same with chlorine, and to prepare a PVC composition having improved impact strength by comprising same.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2018-0158328 filed on December 10, 2018, No. 10-2019-0121170 filed on September 30, 2019 and filed on December 2019 with the Korean Intellectual Property Office. Priority and benefit of No. 10-2019-0163115, filed on September 9, the disclosure of which is incorporated herein by reference in its entirety. [0003] The present disclosure relates to polyethylene with short relaxation time and uniform particle size and its chlorinated polyethylene, which can produce chlorinated polyethylene with low glass transition temperature (Tg) to improve the impact of PVC blends strength. Background technique [0004] Olefin polymerization catalyst systems can be classified into Ziegler-Natta catalysts and metallocene catalysts, and these highly active catalyst systems have been developed according to their characteristics. [0005] Ziegler-Na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F4/659C08F4/6592C08F2/38C08F8/22C08L23/28C08L27/06
CPCC08F8/22C08F110/02C08L27/06C08L2314/06C08L23/06C08L23/286C08F4/65912C08F4/65916C08F2420/06C08F2420/07C08F2420/10C08F4/65904C08F4/65925C08F4/65927C08F2500/07C08F2500/12C08F2500/24C08F4/65908C08F2/38C08F2500/18C08F2810/20C08F4/76C08F4/6592C08F8/20
Inventor 李始贞金善美丁澈焕崔二永洪福基朴城贤
Owner LG CHEM LTD
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