Composition

A composition, polymer technology

Inactive Publication Date: 2007-10-03
BOREALIS TECH OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with high density polyethylene (HDPE) film is the tendency of the film to tear
But the addition of LLDPE results in a large increase in elongation at break, thus making this polymer unsuitable for e.g. shopping bags where elongation is not acceptable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0206] Preparation of bimodal HDPE

[0207] The bimodal Ziegler-Natta material was prepared using the method described in EP-A-1460105. MgCl 2 The supported Ziegler catalyst (available from Engelhard under the trade name Lynx200) is put into a continuous loop reactor together with ethylene and hydrogen to obtain MFR 2 Is 39 and density is 970kg / m 3 Of polymers. 40% by weight of the total polymer production is produced in this reactor.

[0208] The polymer containing the catalyst is transferred semi-continuously to the fluidized gas phase reactor. Here, hydrogen and 1-butene are additionally added. The gas phase reactor temperature is 85°C. 60% by weight of the total polymer production is produced in this reactor. The density of the obtained reaction product is 964kg / m 3 . 1000 ppm of Irganox 1010 and 800 ppm of zinc stearate were added to the product before extrusion.

preparation example 2

[0210] The bis(n-butylcyclopentadienyl) hafnium dichloride catalyst is used to produce ethylene hexene resin in a slurry loop reactor under the following conditions:

[0211] Pressure 42 bar

[0212] C2 amount 4% by weight

[0213] C6 / C2: 0.35

[0214] Temperature 86℃

[0215] Residence time 40-60 minutes

[0216] MFR of the obtained polymer (Sample 4) 2 1.3g / 10min and density of 922kg / m 3 . Other samples were produced in a similar manner to the above, but the process conditions can be adjusted in a known manner by hydrogen feed and comonomer feed to obtain the desired molecular weight listed in Table 1 below (and the resulting MFR ) And density.

Embodiment 1

[0218] The following metallocene and plastomer grades produced were used to prepare the polymer blends.

[0219] Density

kg / m3

MFR 2

g / 10min

M w

Hexene

(wt%)

Octene

(wt%)

Note

Sample 1

934

6

80.000

3.2

Unimodal

SSC

Sample 2

934

1.3

140.000

2.2

Unimodal

SSC

Sample 3

927

1.3

140.000

3.6

Unimodal

SSC

Sample 4

922

1.3

130.000

5.1

Unimodal

SSC

Determine the product

0203

902

3

85.000

19.3

Unimodal

SSC

Determine the product

0210

902

10

65.000

Unimodal

SSC

Determine the product

8210

882

10

70.000

Unimodal

SSC

[0220] The commercially confirmed products listed in Table 1 are co...

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Abstract

A polyethylene composition comprising at least a first composition and a second composition in amounts of at least 70 wt% of the first composition which comprises at least: (A) up to 60 wt% lower molecular weight (LMW) polyethylene homo or copolymer obtained by Ziegler-Natta catalysis having a density of at least 940 kg / m<3>; and (B) up to 60 wt% higher molecular weight (HMW) polyethylene homo or copolymer obtained by Ziegler-Natta catalysis and having lower density than component (A); and up to 30 wt% of the second composition which comprises: (C) a polyethylene homo or copolymer obtained by single site catalysis (SSC) and having a density of up to 980 kg / m<3>; wherein said polyethylene composition has a charpy impact strength at -20 DEG C, according to ISO 179-3 on compression moulded plates of at least 2.5 kJ / m<2> and density at least 925 kg / m<3>.

Description

Technical field [0001] The present invention relates to a polyethylene composition, preferably a high-density polyethylene composition, and to articles made therefrom, such as molded articles and films, which exhibit desired mechanical properties, such as high charpy (Charpy) Impact strength or tensile breaking strain, and desired workability. In a preferred embodiment of the present invention, the present invention relates to a composition comprising a unimodal single active site polyethylene component mixed with a Ziegler-Natta multimodal polyethylene component. Background technique [0002] Due to its advantageous physical and chemical properties, polyethylene is widely used in the manufacture of molded products, such as injection molded products (such as containers and bottles), and various film applications, such as extrusion coating and blown film. [0003] In order for polyethylene to be suitable for all these fields, polyethylene needs to have certain mechanical and proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08F2/00C08J5/18C08F297/08C08F210/16C08L23/08
CPCC08L23/0815B29L2023/001C08F210/16C08J5/18C08J2323/06C08L23/06C08L2205/02C08L2205/03C08L2314/06
Inventor 阿里尔德・福尔斯塔德芒努斯・帕尔姆勒夫卡特林・诺德－瓦豪格艾琳・赫兰梅雷特・斯卡尔斯韦恩・埃根阿尔诺・约翰森约鲁恩・尼尔森
Owner BOREALIS TECH OY
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