Multimodal polyethylene composition obtainable with high activity catalyst

A composition and polyethylene technology, applied in the production of bulk chemicals, etc., can solve problems such as adverse effects of polymer properties and ideal reactions, and achieve the effects of improved appearance, beneficial purity, and improved impact strength

Active Publication Date: 2007-10-17
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, the addition of small amounts of comonomer may not drive the desired level of reaction and / or adversely affect the properties of the polymer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0168] 1. Definitions and Measurement Methods

[0169] a) molecular weight

[0170] 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".

[0171] b) Density

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PUM

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Abstract

The present invention concerns a multimodal, preferably bimodal, polyethylene (PE) composition comprising a base resin which comprises (A) a first ethylene homo- or copolymer fraction, and (B) a second ethylene homo- or copolymer fraction, wherein (i) fraction (A) has a lower weight average molecular weight than fraction (B), (ii) the base resin has an MFR 5 of at least 0.01 g / 10 min and (iii) the base resin is obtainable by polymerising ethylene and optionally at least one comonomer in the presence of a catalyst having an overall activity of at least 30 kg polymer per g catalyst. 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 articles.

Description

technical field [0001] The present invention relates to a multimodal, preferably bimodal polyethylene (PE) composition comprising two ethylene homopolymer or copolymer fractions with different molecular weights. Furthermore, the invention relates to a process for the preparation of such a composition and the use of this composition for the preparation of articles. Background technique [0002] In general, it is difficult to obtain a multimodal PE composition comprising at least one low molecular weight (LMW) fraction and one high molecular weight (HMW) fraction with a sufficient degree of homogeneity. However, in many end-use applications, the uniformity of the final composition is a key factor, for example, including injection molded articles (such as packaging articles, such as shipping packaging, houseware applications and caps / seals) and blow molded articles, In molded articles of pipes and films. [0003] Furthermore, in some applications, residues of polymerization c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08F10/02C08L23/04
CPCC08L23/04C08F110/02C08F210/16C08L23/06C08L23/0815C08L2205/02C08L2205/025C08L2308/00C08L2314/02Y02P20/52
Inventor 埃里克・范普雷特雷姆克・范玛丽昂比尔・古斯塔夫松西夫・弗雷德里克松马茨・贝克曼
Owner ボレアリステクノロジーオイ
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