Melt-Blown Webs Without Shots and With Improved Barrier Properties
First Claim
Patent Images
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.
2 Assignments
0 Petitions
Accused Products
Abstract
Melt-blown webs having no shots and improved barrier properties, whereby the melt-blown webs are made out of a so-called “controlled rheology” propylene (CR-PP), which was visbroken without any peroxide.
-
Citations
12 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- C./2.16 kg) measured according to ISO 1133 of 20 to 5000 g/10 min and
Specification