Olefin Polymer And Preparation Method Thereof

a technology of olefin polymer and olefin polymer, which is applied in the field of olefin polymer, can solve the problems of increasing the use of stretch films, reducing the mechanical properties of conventional lldpe, and poor processability of lldpe for blown films, so as to achieve excellent film processability and physical properties, and excellent mechanical strength. , the effect of high processability

Inactive Publication Date: 2019-09-19
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0042]The olefin polymer according to the present disclosure may exhibit excellent film processability as well as physical properties, since the polymer is prepared by using a hybrid supported catalyst including different kinds of specific transition metal compounds so that the content of the branched structure in the polymer, the weight average molecular weight of the main chain in the branched structure, the weight average molecular weight and number of the long chain branch (LCB) are optimized. Accordingly, it can be useful as a raw material for various products requiring excellent mechanical strength and high processability. In particular, the excellent processability of the olefin polymer makes it possible to produce a stable film during the production of the film by a melt blown process, and thus the polymer may be useful as a raw material for the product produced by the melt blown process.
[0043]The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “include”, “have”, or “possess” when used in this specification, specify the presence of stated features, steps, components, or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, components, or combinations thereof.
[0044]While the present invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example and will herein be described in detail. It should be understood, however, that these are not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.
[0045]Hereinafter, the olefin polymer and the preparation method of the same according to the exemplary embodiments of the present disclosure will be described in more detail.
[0046]Polymer properties such as rheological properties or molecular weight distribution are greatly influenced by structural parameters such as polymer shape, weight average molecular weight and polydispersity index. Generally, a polymer is classified into a linear polymer or a branched polymer according to its shape. The linear polymer refers to a form in which monomers constituting a polymer are linearly combined to form a main chain. In addition, a polymer structure in which various kinds of chains are branched from a linear polymer and has a long chain branch (LCB) is referred to as a branched polymer. Physical properties of such branched polymers differ greatly depending on the molecular weight, distribution and the number of LCB. Therefore, it is important to confirm the existence of the long chain branch which has a great influence on the physical properties of the polymer and accurately measure the structure thereof in order to analyze the physical properties of the polymer.
[0047]In this regard, in the production of an olefin polymer of the present disclosure, film processability and physical properties of the polymer may be simultaneously improved by using a hybrid supported catalyst including different kinds of specific transition metal compounds so that the content of the branched structure in the polymer, the weight average molecular weight of the main chain in the branched structure, the weight average molecular weight and number of the long chain branch are controlled.

Problems solved by technology

The feature of LLDPE has led to an increase in the use of a stretch film, an overlapping film or the like which is difficult to apply existing low density polyethylene or high density polyethylene.
However, LLDPE has poor processability for a blown film compared to excellent mechanical properties.
However, this method has a problem of significantly reducing the mechanical properties of conventional LLDPE even when a very small amount of LDPE is added.
Therefore, a method of improving the processability of the film by introducing LCB into LLDPE has been proposed, but the deterioration of the film properties has not been solved yet.

Method used

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  • Olefin Polymer And Preparation Method Thereof
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  • Olefin Polymer And Preparation Method Thereof

Examples

Experimental program
Comparison scheme
Effect test

synthesis example 1

tion Metal Compound (Metallocene Catalyst Precursor A)

[0172]

[0173]Tetramethylcyclopentadiene (TMCP, 6.0 mL, 40 mmol) was dissolved in THF (60 mL) in a dried 250 mL Schlenk flask and then cooled to −78° C. Then n-BuLi (2.5 M, 17 mL, 42 mmol) was slowly added dropwise to the above solution, and the mixture was stirred overnight at room temperature.

[0174]On the other hand, dichlorodimethylsilane (4.8 mL, 40 mmol) was dissolved in n-hexane in another 250 mL Schlenk flask and then cooled to −78° C. Then, the TMCP-lithiation solution previously prepared was slowly added to this solution, and the mixture was stirred overnight at room temperature. Thereafter, the resulting solution was subjected to reduced pressure to remove solvent. The resulting solid was dissolved in toluene and filtered to remove residual LiCl, thereby obtaining chlorodimethyl(2,3,4,5-tetramethylcyclopenta-2,4-dien-1-yl) silane as an intermediate (yellow liquid, 7.0 g, 33 mmol, 83% yield).

[0175]1H NMR (500 MHz, CDCl3): ...

synthesis example 2

tion Metal Compound (Metallocene Catalyst Precursor B)

[0180]

[0181]The metallocene compound (B) having the above structural formula was prepared (purchased from Strem Corporation, Cas Number 12148-49-1).

synthesis example 3

tion Metal Compound (Metallocene Catalyst Precursor C)

[0182]Tetramethylcyclopentadiene (TMCP, 6.0 mL, 40 mmol) was dissolved in THF (60 mL) in a dried 250 mL Schlenk flask and then cooled to −78° C. Then n-BuLi (2.5 M, 17 mL, 42 mmol) was slowly added dropwise to the above solution, and the mixture was stirred overnight at room temperature.

[0183]On the other hand, dichlorodimethylsilane (4.8 mL, 40 mmol) was dissolved in n-hexane in another 250 mL Schlenk flask and then cooled to −78° C. Then, the TMCP-lithiation solution previously prepared was slowly added to this solution, and the mixture was stirred overnight at room temperature.

[0184]Thereafter, the resulting solution was subjected to reduced pressure to remove solvent. The resulting solid was dissolved in toluene and filtered to remove residual LiCl, thereby obtaining an intermediate (yellow liquid, 7.0 g, 33 mmol, 83% yield).

[0185]1H NMR (500 MHz, CDCl3): 0.24 (6H, s), 1.82 (6H, s), 1.98 (6H, s), 3.08 (1H, s).

[0186]Indene (0....

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Abstract

The present disclosure provides an olefin polymer having excellent film processability and physical properties, and a preparation method of the same.

Description

TECHNICAL FIELDCross-Reference to Related Application[0001]This application claims the benefit of Korean Patent Application No. 10-2016-0174938 filed on Dec. 20, 2016 with the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference in their entirety.[0002]The present disclosure relates to an olefin polymer having excellent film processability and physical properties, and a preparation method of the same.BACKGROUND OF ART[0003]A linear low density polyethylene (LLDPE) is produced by copolymerizing ethylene and an alpha olefin using a polymerization catalyst under low pressure. Thus, this is a resin having a narrow molecular weight distribution and a certain length of a short chain branch (SCB), without a long chain branch (LCB). LLDPE film has high strength at break and elongation in addition to the properties of a general polyethylene and exhibits excellent tear strength, falling weight impact strength or the like. The feature of LLDPE has ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08F210/16C08F4/659C08F4/6592C08F210/14
CPCC08F4/65925C08F4/65916C08F2500/09C08F210/16C08F210/14C08F2500/03C08F2500/26C08F4/65927C08F2500/08C08F2500/18C08F2500/11C08F2500/12C08F4/65904C08J5/18C08F4/65912C08J2323/08C08F2500/31C08F210/02C08F4/65922C08L23/0815
Inventor KWON, OH JOOCHO, SOLPARK, SEUNG KILEE, KI SOOKWON, HEON YONGHONG, DAE SIKPARK, SUNG HYUNPARK, SUNG HOLEE, JIN YOUNG
Owner LG CHEM LTD
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