Method for making propylene monofilaments, propylene...

D - Textiles – Paper – 01 – F

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D01F 6/06 (2006.01) D01F 1/10 (2006.01)

Patent

CA 2468876

The invention concerns a method for making propylene monofilaments having a 230 ·C/2.16 kg melt flow index (MFI) from 2 to 16 g/10 min, having a diameter larger than 0.050 mm and improved abrasion resistance, which consists in adding to the polypropylene 20 to 0.1 wt. % of an additive upstream of the extruder, spinning the molten material in a water bath, drawing it and winding it. The invention also concerns a polypropylene monofilament having a 230 ·C/2.6 kg melt flow index (MFI) from 2 to 16 g/10 min, having a diameter greater than 0.050 mm and improved abrasion resistance, exhibiting a strength of at least 50 cN/tex, for an elongation corresponding to the maximum tensile stress (elongation at rupture) of at least 30 %. Furthermore, it has an abrasion of less than 0.05 % and a relative tensile energy absorption > 100 % after being treated for 24 hours at 120 ·C.

Dans un procédé de fabrication de monofilaments d'un polypropylène présentant un indice de viscosité en fondu (MFI) 230 ~C/2,16 kg de 2 à 16 g/10 min, possédant un diamètre supérieur à 0,050 mm et une résistance à l'abrasion améliorée, on ajoute au polypropylène 20 à 0,1 % en poids d'un additif en amont de l'extrudeuse, on file la matière fondue dans un bain d'eau, on l'étire et on la bobine.Le monofilament d'un polypropylène présentant un indice de viscosité en fondu (MFI) 230 ~C/2,16 kg de 2 à 16 g/10 min, possédant un diamètre supérieur à 0,050 mm et une résistance à l'abrasion améliorée, présente une résistance d'au moins 50 cN/tex, pour un allongement correspondant à l'effort de traction maximal (allongement à la rupture) de moins de 30 %. Il présente par ailleurs une abrasion de moins de 0,05 % et une énergie de rupture relative > 100 % après traitement de 24 heures à 120 ~C.

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