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Ethylene/alpha-olefin copolymer and preparation method therefor

A technology of olefin copolymer and olefin comonomer, which is applied in the field of ethylene/α-olefin copolymer and its preparation, can solve the problems of uneven molecular weight dispersion state, unstable physical properties, rough extrusion appearance, etc., and achieve excellent impact Effects of strength and mechanical properties, improved reaction efficiency, excellent processability

Active Publication Date: 2020-11-20
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although such products have improved processability, there is a problem that the extruded appearance is rough and the physical properties are not stable even under relatively good extrusion conditions due to the non-uniform dispersion state of the molecular weight in the unit particle.

Method used

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  • Ethylene/alpha-olefin copolymer and preparation method therefor
  • Ethylene/alpha-olefin copolymer and preparation method therefor
  • Ethylene/alpha-olefin copolymer and preparation method therefor

Examples

Experimental program
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preparation example Construction

[0079] Meanwhile, the ethylene / α-olefin copolymer having the above physical properties can be produced by a production method comprising injecting hydrogen at 45 to 100 cc / min in the presence of a catalyst composition comprising a transition metal compound of the following formula 1 to polymerize ethylene and alpha-olefin-based monomers. Accordingly, another aspect of the present invention provides a method for preparing an ethylene / α-olefin copolymer.

[0080] [Formula 1]

[0081]

[0082] In formula 1, R 1 is hydrogen; alkyl of 1 to 20 carbon atoms; cycloalkyl of 3 to 20 carbon atoms; alkenyl of 2 to 20 carbon atoms; alkoxy of 1 to 20 carbon atoms; atoms; arylalkoxy of 7 to 20 carbon atoms; alkylaryl of 7 to 20 carbon atoms; or arylalkyl of 7 to 20 carbon atoms,

[0083] R 2a to R 2e each independently hydrogen; halogen; alkyl of 1 to 20 carbon atoms; cycloalkyl of 3 to 20 carbon atoms; alkenyl of 2 to 20 carbon atoms; alkoxy of 1 to 20 carbon atoms; or an aryl grou...

Embodiment 1

[0169] Into a 1.5 L autoclave continuous process reactor was charged hexane solvent (5.0 kg / h) and 1-octene (1.00 kg / h) and the top of the reactor was preheated to a temperature of 150°C. At the same time, inject triisobutylaluminum compound (0.05mmol / min), the transition metal compound (1a) (0.40μmol / min) prepared in the synthesis example as a catalyst, and dimethylanilinium tetrakis (penta Fluorophenyl) borate accelerator (1.20 μmol / min). Then, ethylene (0.87kg / h) and hydrogen (50cc / min) were injected into the autoclave reactor, and the copolymerization reaction was continuously performed for 60 minutes or more while maintaining a pressure of 89 bar and a polymerization temperature of 125°C to prepare a copolymer .

[0170] Then, the remaining ethylene gas was vented, and the copolymer-containing solution thus obtained was dried in a vacuum oven for more than 12 hours. The physical properties of the copolymer thus obtained were measured.

Embodiment 2 to 7 and comparative example 1 to 7

[0172] A polymer was prepared by the same method as in Example 1 except that the reactant raw materials were injected in the amounts listed in Table 1 below.

[0173] [Table 1]

[0174]

[0175] *In comparative examples 6 and 7, [Me 2 Si(Me 4 C 5 )NtBu]Ti(CH 3 ) 2 used as a catalyst.

[0176] [Evaluation of Physical Properties of Olefin Polymers]

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Abstract

The present invention provides an ethylene / alpha-olefin copolymer which has: a low density and ultralow molecular weights with a narrow distribution of molecular weights; a minimum number of unsaturated functional groups; and comonomers uniformly existing thereacross, thereby exhibiting excellent physical properties, and a preparation method therefor.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 2018-0052043 filed with the Korean Intellectual Property Office on May 4, 2018, the contents of which are incorporated herein by reference. technical field [0003] The present invention relates to an ethylene / α-olefin copolymer in which comonomers are uniformly present to exhibit excellent physical properties and a method for preparing the same. Background technique [0004] Olefin polymerization catalyst systems can be classified into Ziegler-Natta catalyst systems and metallocene catalyst systems, and these two highly active catalyst systems have been developed according to their respective characteristics. The Ziegler-Natta catalyst has been widely used in commercial processes since its invention in the 1950s, but it is a multi-site catalyst in which many active sites coexist, and it is characterized by a wide molecular weight distribution of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/16C08F210/14C08F2/38C08F4/6592C08F4/649C09J123/08
CPCC08F210/16C09J123/08C09J123/0815C08F210/14C08F2500/02C08F2500/03C08F2500/08C08F2500/12C08F2500/17C08F4/6592C08F2/38C08F4/6495C08F4/6496C08F2500/18C09J2301/304C09J123/16
Inventor 孔镇衫郑丞桓全晸浩郭来根李忠勳李银精周炫珍朴仁成朴想恩
Owner LG CHEM LTD
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