Polypropylene-Based Monofilaments With Improved Properties

Abstract

The invention relates to polypropylene-based monofilaments having improved properties, especially an improved abrasion resistance, to a process for manufacturing these monofilaments and to their use. The invention relates more particularly to polypropylene-based monofilaments obtained from a polypropylene having a melt flow index (MFI) at 230° C./2.16 kg of less than or equal to 1.9 g/10 min.

1 - 11 . (canceled) 
   
   
       12 . Polypropylene-based monofilaments, made from a polypropylene having a melt flow index (MFI) at 230° C./2.16 kg of less than or equal to 1.9 g/10 min. 
   
   
       13 . The monofilaments according to  claim 12 , having an abrasion of less than or equal to 0.014%. 
   
   
       14 . The monofilaments according to  claim 13 , wherein the abrasion value is less than or equal to 0.01%. 
   
   
       15 . The monofilaments according to  claim 12 , having a strength of at least 50 cN/tex for an elongation corresponding to the maximum tensile stress (elongation at break) at least equal to 20%. 
   
   
       16 . The monofilaments according to  claim 12 , further comprising 0.01 to 20% by weight of additive relative to the weight of polypropylene. 
   
   
       17 . The monofilaments according to claim  5 , wherein the additive is a polypropylene/polyethylene copolymer having a melting point ≧140° C. 
   
   
       18 . The monofilaments according to claim  6 , wherein the copolymer is present in a quantity of 1 to 20% by weight of this copolymer relative to the weight of polypropylene. 
   
   
       19 . A process for manufacturing the monofilaments as defined in  claim 12 , comprising the steps of extrusion/melt-spinning, drawing and winding of the polypropylene. 
   
   
       20 . A two-dimensional high-performance article comprising the monofilaments as defined in  claim 12 . 
   
   
       21 . A fabric for filtration comprising the monofilaments as defined in  claim 12 .