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Melt-Blown Webs Without Shots and With Improved Barrier Properties

  • US 20190323155A1
  • Filed: 06/25/2019
  • Published: 10/24/2019
  • Est. Priority Date: 12/15/2014
  • Status: Active Grant
First Claim
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1. A method of preparing a melt-blown web which is free of shots, the method comprising blowing a molten polypropylene composition from an extruder die tip onto a conveyer or take-up screen, wherein the polypropylene composition comprises(A) a polypropylene polymer and(B) optionally a polymeric nucleating agent,wherein the polypropylene composition has(i) a melt flow rate MFR2 (230°

  • C./2.16 kg) measured according to ISO 1133 of 20 to 5000 g/10 min and(ii) a melting temperature Tm between ≥

    130°

    C. and ≤

    170°

    C. and(iii) a molecular weight distribution (MWD)>

    2 and(iv) wherein the polypropylene composition has been visbroken without the use of peroxides.

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