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Meltblown Media for Air Filtration

A technology of melt-blown and melt-blown fibers, which is applied in the fields of filtration separation, melt spinning, textile, etc.

Active Publication Date: 2015-12-16
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, even though conventional meltblown webs are the material of choice for filter media, their filtration efficiency still needs to be improved

Method used

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  • Meltblown Media for Air Filtration
  • Meltblown Media for Air Filtration
  • Meltblown Media for Air Filtration

Examples

Experimental program
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Effect test

preparation example Construction

[0108] All or part of the preparation steps can be carried out in a continuous manner. Reference is made to WO2006 / 069733 which describes the principle of such a continuous or semi-continuous preparation method of the solid catalyst type prepared by an emulsion / curing method.

[0109] The catalyst components described above were prepared according to the method described in WO01 / 48034.

[0110] The polymerization of the propylene copolymer (PP) may be a bulk polymerization, preferably carried out in a so-called loop reactor. Alternatively, the polymerisation of the propylene copolymer (PP) is a two-stage polymerisation carried out in a combination of a slurry phase operated loop reactor and a gas phase reactor as used for example in the Borstar polypropylene process.

[0111] Preferably, in the process for the preparation of the above-defined propylene copolymer (PP), the conditions of the step of the bulk reactor may be as follows:

[0112] - the temperature is in the range...

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PUM

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Abstract

A meltblown fiber (MBF) comprising a propylene copolymer (PP), wherein the meltblown fiber (MBF) and / or the propylene copolymer (PP) has (a) according to ISO? Melt flow rate MFR2 (230°C), measured at 1133, of at least 300 g / 10 min, (b) a comonomer content of 1.5% to 6.0% by weight, the comonomer being ethylene and / or at least one C4 to C12α Alkenes, (c) <2,1> regiodefects greater than 0.4 mol % as determined by 13C-NMR spectroscopy.

Description

technical field [0001] The present invention relates to a novel meltblown web based on meltblown fibers comprising propylene copolymers and articles made therefrom, particularly filter media. Background technique [0002] Meltblown webs are nonwoven structures composed of meltblown fibers, typically made by a one-step process in which high velocity air blows molten thermoplastic resin from the tip of an extruder die onto a conveyor or receiver web to form a fine Self-adhesive web of fibers. Although many types of polymers are available for meltblown fibers and fabrics, polypropylene is one of the most commonly used polymers. Typically, to produce meltblown fibers and webs, very low viscosity polypropylene homopolymers are used. However, such polymers suffer from limited mechanical strength. To overcome this problem, spunbond fabrics were prepared. Compared to meltblown webs, the polypropylene fibers of spunbond fabrics are much thicker and thus the overall weight of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/098D01F6/30C08F210/06D04H1/56
CPCB01D39/1623C08F10/06D01D5/0985D01F6/30D04H1/4291D04H1/43838Y10T428/298Y10T442/68C08F110/06C08F2500/03C08F2500/12C08F2500/15C08F2500/20C08F210/06C08F210/16D01D5/10
Inventor 安蒂·泰尼斯约阿希姆·菲比格
Owner BOREALIS AG