| 摘要 |
<p>Melt-blown fiber having an average diameter of not more than 5.0μm, said fiber comprises at least 85 wt.-% of a propylene copolymer, wherein•said melt blown fiber and/or said propylene copolymer has/have a melt flow rate MFR (230 °C) measured according to ISO 1133 of at least 200 g/10min,•said propylene copolymer has a comonomer content of 0.5 to 5.5 wt.-%, the comonmers are ethylene and/or at least one C to Cα-olefin selected from the group consisting of 1 -butene, 1-pentene, 1-hexene, 1-heptene, and 1-octene,•the propylene copolymer has <2,1> regiodefects of not more than 0.4 mol.-% determined by C-spectroscopy, and•said melt blown fiber and/or said propylene copolymer fulfill(s) the equation (1). wherein Tm [°C] is the melting temperature [given in °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).</p> |
