Multimodal polyethylene composition with improved homogeneity
A technology of composition and polyethylene, applied in the directions of transportation, packaging, thin material processing, etc., can solve the problems of increasing the production cost of the composition, and achieve the effects of improving appearance, good mechanical properties, and improving impact strength
Active Publication Date: 2010-11-24
ボレアリステクノロジーオイ
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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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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
Multimodal polyethylene composition with improved uniformity technical field 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 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 pip...
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IPC IPC(8): C08L23/04C08L23/06C08F10/02C08F2/00
CPCC08L2205/02C08F210/16C08L23/0815C08L23/06C08L2205/025C08L23/04Y10T428/1397C08F2/001C08L2666/06C08F210/08C08F2500/12C08F2500/07C08F2500/17C08F2/00C08F10/02
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