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Polymer

A technology of polymers and copolymers, applied in the field of high-density polyethylene polymers

Inactive Publication Date: 2011-09-07
BOREALIS TECH OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes it possible to prepare thinner packaging films

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] The preparation of embodiment 1HDPE

[0111] In a volume of 500dm 3 Continuously introduce isobutane, ethylene and hydrogen into the loop reactor. Furthermore, a polymerization catalyst additionally prepared according to Example 3 in WO 95 / 35323 was introduced into the reactor together with triethylaluminum so that the molar ratio of aluminum in the activator to titanium in the solid component was 15. The loop reactor was operated at 96°C and 60 bar. In this slurry reactor, the content of ethylene in the liquid phase is 8.5 mol%, and the ratio of hydrogen to ethylene is 0.210 kg H 2 / t C2. The polymer produced in this loop reactor has an MFR of 0.9 g / 10 min 2 , MFR of 27g / 10min 21 and 958kg / m 3 Density. The feed rates of ethylene and catalyst were adjusted to give a polymer output rate of 30 kg / h.

[0112] The polymer powder was recovered and mixed with 1500 ppm of Irganox B215 and 3500 ppm of calcium stearate. The mixture was extruded and pelletized in a ZSK70...

Embodiment 2

[0113] The preparation of embodiment 2 film

[0114] Films of 30 μm were produced on a 3-layer coextrusion blown film line from Windmoller & Holscher (for all WVTR determinations above and below, tear resistance and other mechanical properties) with a 200 mm die. The die gap was 1.2mm. All three layers contain the same pure HDPE material.

[0115] The blow up ratio (BUR) was 3:1.

[0116] Cold line height (FLH): 70cm above the die head.

[0117] The temperature curve is a flat straight line at 200°C.

[0118] The output rate is 120kg / h.

[0119] Internal Bubble Cooling (IBC) is used.

Embodiment 3

[0121] The polymers and films of Examples 1 and 2 were compared to HDPE grades produced with commercially available catalysts as well as commercially available Ziegler-Natta HDPE grades. The results are shown in Table 1 below.

[0122] Table 1

[0123]

[0124]

[0125] It is evident that the polymers of the examples have higher crystallinity (density) and thus the higher WVTR of their films (example 2). At the same time, the HDPE has an improved strain at break. Oxygen permeability is also lower than products on the commercial market.

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Abstract

The present invention relates to a high density polyethylene homopolymer or copolymer with at least one C3-20 alpha olefin, wherein the polymer has an MFR2 of 0.05 to 10 g / 10min, a density of at least 940 kg / m<3> and a strain at break in the transverse direction of at least 650% and when the polymer is formulated as a film having a thickness of 30 microns, it has a WVTR of less than 4.5 g / m<2> / 24 hours according to ASTM F 1249 at 380 DEG C and 90% humidity.

Description

technical field [0001] The present invention relates to a high-density polyethylene polymer which has excellent processability and mechanical strength and is also capable of forming a film having remarkable water vapor barrier properties. In particular, the present invention relates to a polyethylene polymer having high breaking strain and tear resistance while being capable of forming films such as having excellent WVTR. Background technique [0002] HDPE is widely used in the manufacture of films in a range of applications such as shrink films, shopping bags, etc. HDPE films are also commonly used in food packaging, for example for packaging dry foods such as cereals. Films used in food packaging require barrier properties (ie they should be moisture impermeable) to prevent or minimize degradation of the packaged product, thereby increasing its shelf life. While barrier layers can be relied upon, food packagers prefer polymeric materials that inherently provide barrier p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/02C08J5/18
CPCC08J5/18C08J2323/06C08F110/02C08F2500/07C08F2500/12C08F2500/11C08F2500/17C08F2500/19C08F2500/26C08F2500/04
Inventor 彼得·沃尔特曼斯约伦·尼尔森
Owner BOREALIS TECH OY