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Polyolefin and preparation method thereof

A polyolefin and olefin comonomer technology, applied in the field of polyolefin, can solve the problems of unstable physical properties, rough appearance, etc., and achieve the effect of excellent formability and high die expansion

Active Publication Date: 2010-03-24
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even if the prepared polyethylene has improved processability, because the dispersion state according to the molecular weight in individual particles is not uniform, the appearance is rough and the physical properties are not stable under relatively ideal processing conditions

Method used

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  • Polyolefin and preparation method thereof

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preparation example Construction

[0068] In the method for preparing polyolefins according to the present invention, silica, silica-alumina, and silica-magnesia dried at high temperature can be used as a carrier that can be used to manufacture a supported composite metallocene catalyst , and they can often include oxides such as Na 2 O, K 2 CO 3 , BaSO 4 , Mg(NO 3 ) 2 And carbonate, sulfate, nitrate components.

[0069] It is preferable that the number of hydroxyl groups (-OH) on the surface of the support is as small as possible, but it is practically difficult to remove all the hydroxyl groups (-OH). Therefore, the amount of hydroxyl groups (—OH) is preferably in the range of 0.1-10 mmol / g, more preferably 0.1-1 mmol / g, and most preferably 0.1-0.5 mmol / g. The amount of surface hydroxyl groups (—OH) can be controlled by using the production conditions or methods of the carrier, or the drying conditions or methods (temperature, time, pressure, etc.). In addition, in order to reduce a side reaction cause...

preparation Embodiment 1

[0120] Preparation of the first metallocene catalyst-synthesis [ t Bu-O-(CH 2 ) 6 -C 5 h 4 ] 2 ZrCl 2

[0121] The preparation of tert-butyl-O-(CH 2 ) 6 -Cl, and react NaCp against it to obtain tert-butyl-O-(CH 2 ) 6 -C 5 h 5 (Yield 60%, b.p. 80°C / 0.1 mmHg). In addition, tert-butyl-O-(CH 2 ) 6 -C 5 h 5 It was dissolved in THF at -78°C, n-butyllithium (n-BuLi) was slowly added thereto, the temperature was raised to room temperature, and the reaction was performed for 8 hours. Allow the solution to react for an additional 6 h at room temperature while slowly adding the synthesized lithium salt solution to the ZrCl at -78 °C 4 (THF) 2(1.70g, 4.50mmol) / THF (30ml) suspension. All volatile materials were vacuum dried and hexane solvent was added to obtain oily liquid material which was then filtered. After the filtrate was vacuum-dried, hexane was added thereto to cause precipitation at low temperature (-20°C). The obtained precipitate was filtered at low tempe...

preparation Embodiment 2

[0124] Preparation of the first metallocene catalyst-synthesis [ t Bu-O-(CH 2 ) 6 -C 5 h 4 ] 2 HfCl 2

[0125] The preparation of tert-butyl-O-(CH 2 ) 6 -Cl, and react NaCp against it to obtain tert-butyl-O-(CH 2 ) 6 -C 5 h 5 (Yield 60%, b.p. 80°C / 0.1mmHg). In addition, tert-butyl-O-(CH 2 ) 6 -C 5 h 5 It was dissolved in THF at -78°C, n-butyllithium (n-BuLi) was slowly added thereto, the temperature was raised to room temperature, and the reaction was performed for 8 hours. Allow the solution to react for an additional 6 h at room temperature while slowly adding the synthesized lithium salt solution to HfCl at -78 °C 4 (1.44g, 4.50mmol) / THF (30ml) suspension. All volatile materials were vacuum dried and hexane solvent was added to obtain oily liquid material which was then filtered. After the filtrate was vacuum-dried, hexane was added thereto to cause precipitation at low temperature (-20°C). The obtained precipitate was filtered at low temperature to obt...

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Abstract

The present invention relates to a polyolefin that has high environmental stress cracking resistance (ESCR), a high impact property, and an excellent die swell property, and a method of preparing thesame. According to the method of preparing polyolefin of the present invention, a supported hybrid metallocene catalyst and an alpha olefin comonomer having 4 or more carbon atoms are used to obtain polyolefin having the bimodal or multimodal molecular weight distribution curves during the single reactor polymerization. The polyolefin has excellent processability, a melt flow rate ratio (MFRR) that is useful to processing, excellent shapability, impact strength, tensile strength, in particular, environmental stress cracking resistance (ESCR) and full notch creep test (FNCT), thus being used tomanufacture the blow molded product.

Description

technical field [0001] The present invention relates to a polyolefin having high environmental stress crack resistance (ESCR), high impact and excellent die swell, and a preparation method thereof. [0002] This application claims priority from Korean Patent Application No. 10-2007-0042602 filed with the Korean Intellectual Property Office (KIPO) on May 2, 2007, the entire disclosure of which is hereby incorporated by reference. Background technique [0003] In general, blow molding is a method in which preforming is performed by using extrusion or injection to form a tube, which is achieved in a mold into which air is blown to expand the formed structure and cooled Curing to obtain a molded body having a predetermined shape. Blow molding is mainly divided into extrusion blow molding (extrusion or direct blow molding), injection blow molding and stretch blow molding according to the preforming method. [0004] Hollow bottle products having a small thickness and various siz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F4/64C08F10/00
CPCC08F4/65912C08F210/16C08F10/00C08F4/65925C08F4/6592C08F4/65904C08F4/65916C08F210/08C08F2500/13C08F2500/07C08F2500/12C08F2500/14C08F2500/05C08F4/64C08F4/00C08J9/00
Inventor 赵峻熙李琪树韩龙圭洪大植权宪容朴种相金善庆
Owner LG CHEM LTD
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