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Melt blown fiber

A technology of melt-blown fibers and fibers, which is applied in the directions of fiber processing, fiber chemical characteristics, melt spinning, etc., and can solve problems such as limited mechanical strength

Active Publication Date: 2012-08-15
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this polymer has limited mechanical strength

Method used

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Examples

Experimental program
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preparation example Construction

[0057] The preparation of meltblown fibers and / or webs is described in more detail below.

[0058] The propylene copolymers described in the present invention can be prepared by reacting propylene optionally with at least another C 2 to C 20 Alpha-olefins (comonomers) are polymerized to make part of the propylene copolymer. This fraction is then transferred to a subsequent gas phase reactor where propylene is then mixed with appropriately selected other C 2 to C 20The alpha-olefin (comonomer) reacts to make another fraction in the presence of the reaction product from the first step. This reaction sequence achieves reactor mixing of fractions (i) and (ii) constituting the propylene copolymer. Of course, the present invention can also adopt the following method: the first reaction is carried out in a gas phase reactor, and the second polymerization reaction is carried out in a slurry reactor such as a loop reactor. Further, it is also possible to reverse the manufacturing ...

Embodiment

[0072] 1. Definition / measurement method

[0073] Unless otherwise stated, the following definitions of terms and determination methods are applicable to the above description and the following examples of the present invention.

[0074] pass 13 C NMR spectroscopy to quantify isotacticity in polypropylene

[0075] By quantitative 13 C Isotacticity was determined by nuclear magnetic resonance (NMR) spectroscopy. The experimental parameters are adjusted to ensure the determination of quantitative spectra for this specific task, for example as described in: S. Berger and S. Braun, 200 and More NMR Experiments: A Practical Course, 2004, Wiley-VCH, Weinheim . Quantitative values ​​were calculated using simple corrected ratios of signal integrals for representative sites in a manner known in the art. Isotacticity is determined at the pentavalent level (ie the mmmm portion of the pentavalent distribution).

[0076] 2,1-propene insertion

[0077] The relative amount of 2,1-inser...

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Abstract

Melt-blown fiber having an average diameter of not more than 5.0 [mu]m, said fiber comprises at least 85 wt% of a propylene copolymer, wherein DEG said melt blown fiber and / or said propylene copolymer has / have a melt flow rate MFR2 (230 DEG C) measured according to ISO 1133 of at least 200 g / 10min, DEG said propylene copolymer has a comonomer content of 0.5 to 5.5 wt%, the comonmers are ethylene and / or at least one C4 to C20 a-olefin selected from the group consisting of 1-butene, 1-pentene, 1-hexene, 1-heptene, and 1-octene, DEG the propylene copolymer has 13C-spectroscopy, and DEG said melt blown fiber and / or said propylene copolymer fulfill(s) the equation (1).; wherein Tm [DEG C] is the melting temperature [given in DEG C] of melt blown fiber said and / or of said propylene copolymer measured according to ISO 11357-3, C2 [wt%] is the amount [given in weight percentage] of comonomers within said melt blown fiber and / or within said propylene copolymer determined with Fourier transform infrared spectroscopy (FTIR).

Description

technical field [0001] The present invention relates to a new meltblown web based on meltblown fibers comprising a propylene copolymer, and to products made from the meltblown web. Background technique [0002] Meltblown webs having a nonwoven structure composed of meltblown fibers are typically made by a one-step process in which high velocity air blows molten thermoplastic resin from an extruder die to a conveyor or take-up screen. ) in order to form a fine fiber self-bonding web. While many types of polymers can be used for meltblown fibers and fabrics, polypropylene is one of the most commonly used polymers. Very low viscosity polypropylene homopolymers are typically used for the manufacture of meltblown fibers and webs. However, this polymer has limited mechanical strength. To overcome this problem, spunbonded fabrics are manufactured. The polypropylene fibers in spunbond fabrics are much thicker than meltblown fibers, so the total weight of spunbond fabrics is much...

Claims

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Application Information

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IPC IPC(8): D01F6/30C08F210/06D01D5/098D04H1/56
CPCC08F210/06D01D5/0985D04H1/56D04H3/007D04H3/16D01F6/30Y10T428/298Y10T442/626Y10T442/68C08F210/16C08F2500/12D01D5/08D04H1/4291
Inventor H·范帕里顿B·布勒德思W·H·A·萨尔斯J·菲比希N·阿克曼
Owner BOREALIS AG
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