Phthalate free pp homopolymer for nucleation of meltblown fibers
A melt-blown fiber and homopolymer technology, applied in the field of new polypropylene compositions, can solve the problems of reducing the possibility of thinner fibers, reducing thermomechanical stability, and limiting use, and achieves the effect of improving thermomechanical properties
Active Publication Date: 2019-07-30
BOREALIS AG
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Problems solved by technology
However, one problem in fiber nucleation is the nature of the nucleating agent
The typical size of the nucleating agent is about 3 to 5 microns, such as 2,2'-methylenebis-(4,6- Di-tert-butylphenyl) sodium phosphate (e.g. NA-11; supplier Adeka), which is larger than the usual 1 to 2 micron fiber diameter of melt-blown fibers suitable for filtration and hygiene applications, which limits its use in The use in these applications also reduces the possibility of making thinner fibers
Furthermore, another challenge is to disperse this nucleating agent in a melt with low viscosity
As also described in WO 2012055797, in the case of using β-nucleating agents to prepare melt-blown PP fibers, in addition to the above-mentioned problems, the inherently low melting point of PP through β-modification will reduce their respective thermomechanical stability
Method used
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[0027] The present invention will be described in more detail below.
[0028] The polypropylene composition according to the present invention comprises as component (A) a propylene homopolymer and as component (B) a polymeric nucleating agent.
[0029] Component (A): Propylene Homopolymer
[0030] According to the present invention, the expression "propylene homopolymer" relates to a polypropylene consisting essentially of, i.e. at least 99.0% by weight, more preferably at least 99.5% by weight, even more preferably at least 99.8% by weight, such as at least 99.9% by weight, of propylene units . In another embodiment, only propylene units are detected, ie only propylene is polymerized.
[0031] One requirement of the propylene homopolymer is, measured according to ISO 1133, that the propylene homopolymer has a melt flow rate MFR 2 (230°C / 2.16kg) in the range of 90 to 5000g / 10min, preferably in the range of 100 to 4500g / 10min, more preferably in the range of 120 to 4000g / 10...
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Abstract
The present invention relates to a novel polypropylene composition comprising a propylene homopolymer and a polymer nucleating agent, a meltblown fiber comprising the polypropylene composition, a meltblown web comprising the meltblown fiber and / or the polypropylene composition, Comprising the melt-blown fiber and / or the melt-blown web and the polypropylene composition in improving the relationship between the pressure drop and the hydrostatic pressure of the melt-blown web and improving the melt-blown web in the machine direction (MD) and transverse direction (TD) Uses on thermomechanical properties.
Description
technical field [0001] The present invention relates to a novel polypropylene composition comprising a propylene homopolymer and a polymer nucleating agent, a meltblown fiber comprising the polypropylene composition, a meltblown web comprising the meltblown fiber and / or the polypropylene composition , Use of articles comprising such meltblown fibers and / or meltblown webs and polypropylene compositions for improving the relationship between pressure drop and hydrostatic pressure and thermomechanical properties of meltblown webs. Background technique [0002] Meltblown webs of nonwoven structure composed of meltblown fibers are usually prepared in a one-step process in which high-velocity air sprays molten thermoplastic resin from the extruder die onto a conveyor or take-up screen to form a fine fibrous self- bonded mesh. While many types of polymers can be used for meltblown fibers and fabrics, polypropylene is one of the most commonly used polymers. Usually for the manufac...
Claims
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IPC IPC(8): C08J3/22C08L23/12C08K5/00D01D5/098D01F1/10D01F6/06D04H1/4291D04H1/56
CPCC08J3/226C08L23/12D01D5/0985D01F1/10D01F6/06D04H1/4291D04H1/56C08J2323/12C08L2203/12C08L2205/025C08L2205/24C08K5/0083C08F210/06C08F2/001C08F4/651D04H1/54D10B2321/022D04H1/42
Inventor 王静波威赫尔姆斯·亨里克斯·阿道夫·萨斯约阿希姆·菲比格亨克·范·帕里丹马库斯·加莱特纳
Owner BOREALIS AG