Melt-extrudable thermoplastic polypropylene composition and...

C - Chemistry – Metallurgy – 08 – L

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C08L 23/10 (2006.01) D01F 6/06 (2006.01)

Patent

CA 2202298

A melt-extrudable thermoplastic polypropylene composition having a melt flow rate in a range of from about 18 to about 30 g/10 minutes at a temperature of 190 ·C and a load of 2.16 kg, a polydispersity less than 4, and a Z-average molecular weight greater than 300,000 as determined by differential refractometry. The composition may include a first thermoplastic polypropylene having a melt flow rate lower than 18 g/10 minutes at a temperature of 190 ·C and a load of 2.16 kg and a second thermoplastic polypropylene having a melt flow rate higher than 18 g/10 minutes at a temperature of 190 ·C and a load of 2.16 kg. The weight ratio of the first polypropylene to the second polypropylene is in a range of from about 90:10 to about 10:90. The composition may include from about 0.1 to about 1 percent by weight, based on the weight of the first and second thermoplastic polypropylenes, of a defined alkyl-substituted polysiloxane. A method of forming a nonwoven web also is provided, which method involves compounding the melt-extrudable thermoplastic polypropylene composition composed of a first and second thermoplastic polypropylene as described above. The compounded thermoplastic composition is melt-extruded through a die to form continuous fibers. The continuous fibers are quenched to a solid state, drawn or attenuated, and randomly deposited on a moving foraminous surface as a web of entangled fibers. The composition may include the alkyl-substituted polysiloxane.

Composition de polypropylènes thermoplastiques extrudable à chaud présentant un indice de fluage compris entre environ 18 et environ 30 g/10 min à la température de 190 ~C et une charge de 2,16 kg, une polydispersivité inférieure à 4 et un poids moléculaire moyen Z (mesuré par diffractométrie différentielle) supérieur à 300 000. La composition peut comprendre un premier polypropylène thermoplastique présentant un indice de fluage inférieur à 18 g/10 min à la température de 190 ~C et une charge de 2,16 kg et un deuxième polypropylène thermoplastique présentant un indice de fluage supérieur à 18 g/10 min à la température de 190 ~C et une charge de 2,16 kg. Le rapport pondéral entre le premier et le deuxième polypropylène est compris entre 90/10 et 10/90. La composition peut également comporter entre environ 0,1 et 1,0 % en poids (des deux polypropylènes thermoplastiques ci-dessus) d'un polysiloxane à substitution acide donné. Est par ailleurs présenté un procédé de formation d'un non-tissé consistant à malaxer la composition de polypropylènes thermoplastiques décrite ci-dessus puis à l'extruder à chaud par une filière de façon à former des fibres continues qui sont refroidies jusqu'à l'état solide ou atténuées et déposées aléatoirement sur une surface mobile foraminée pour y former un matériau de fibres enchevêtrées.

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