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Multimodal polyethylene composition with improved homogeneity

A technology of composition and polyethylene, which is applied in the directions of transportation, packaging, thin material processing, etc., can solve the problems of increased production cost of the composition, and achieve the effects of improved appearance, good surface properties, and good mechanical properties

Active Publication Date: 2007-09-12
ボレアリステクノロジーオイ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have the disadvantage that they are associated with a significant increase in the production costs of the composition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0093] Tests and Examples

[0094] 1. Definitions and Measurement Methods

[0095] a) molecular weight

[0096] Weight average molecular weight M w and molecular weight distribution (MWD=M w / M n , where M n is the number average molecular weight, and M w is the weight average molecular weight) was measured by a method based on ISO 16014-4:2003. A Waters 150CV plus instrument was used with a column 3 x HT&E styragel (divinylbenzene) from Waters and trichlorobenzene (TCB) as solvent at 140°C. Use the common narrow MWD PS standard (for PS, the Mark-Howwink constant K: 9.54*10 -5 and a: 0.725; and for PE, K: 3.92*10 -4 and a: 0.725) to calibrate the column setting. m w with M n The ratio of is a measure of the width of the distribution, since each is affected by opposite ends of the "population".

[0097] b) Density

[0098] Density is measured according to ISO 1872 Annex A.

[0099] c) Melt flow rate / flow rate ratio

[0100] Melt flow rate (MFR) is determined acco...

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PUM

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Abstract

The present invention concerns a multimodal polyethylene composition comprising a base resin comprising three ethylene homo- or copolymer fractions (A), (B) and (C) with different weight average molecular weight M w , wherein a) fraction (A) has an MFR 21 equal or lower than 20 g / 10min, b) fraction (B) has a lower weight average molecular weight than fraction (C), c) fraction (C) has a lower weight average molecular weight than fraction (A), d) the composition has an eta 747 of 350 kPas or higher, and e) the composition has a MFR 5 of 0.15 g / 10min or higher and a white spot area of 1 % or below. Furthermore, the present invention relates to a process for the production of such a composition as well as to the use of such a composition for the production of a pipe, for moulding applications, and wire and cable applications.

Description

technical field [0001] The present invention relates to a multimodal polyethylene composition with improved uniformity comprising a low molecular weight fraction, a high molecular weight fraction and an ultrahigh molecular weight fraction. Furthermore, the invention relates to a process for the preparation of the composition and the use of the composition for the preparation of pipes, for molding applications and for wire and cable applications. Background technique [0002] Multimodal polyethylene compositions are often used eg in the manufacture of pipes due to their excellent physical and chemical properties such as mechanical strength, corrosion resistance and long-term stability. When considering that fluids such as water and natural gas that are often transported in pipelines are pressurized and have varying temperatures typically in the range of 0°C to 50°C, it is evident that the polyethylene composition used for the pipe must meet the required Require. [0003] Ho...

Claims

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Application Information

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IPC IPC(8): C08L23/04C08L23/06C08F10/02C08F2/00
CPCY10T428/1397C08L23/06C08L23/0815C08F210/16C08L2205/025C08L23/04C08L2205/02C08F2/001C08L2666/06C08F210/08C08F2500/12C08F2500/07C08F2500/17C08F2/00C08F10/02
Inventor 马茨·贝克曼比尔·古斯塔夫松埃里克·范普雷特雷姆克·范玛丽昂
Owner ボレアリステクノロジーオイ
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