Elastic spunbonded nonwoven and elastic nonwoven fabric...

D - Textiles – Paper – 01 – F

Patent

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Details

D01F 8/06 (2006.01) D04H 3/16 (2006.01)

Patent

CA 2697552

The elastic spunbonded nonwoven (W) has high elastic recovery properties and comprises a plurality of multicom-ponent filaments. Each multicomponent filament, preferably of the sheath/core type, comprises a first polymeric component (P) extending along the length of the filament in at least a first section of the filament, and a second polymeric component (P) extending along the length of the filament in at least a second section of the filament that is distinct from the first section. The first polymeric component (P) comprises an elastic propylene-based olefin copolymer, and the second polymeric component (P) comprises an elastic propylene-based olefin and has a melt flow rate MFR2 that is higher than the melt flow rate MFR1 of the first polymeric component. The elastic propylene- based olefin copolymer for the first polymeric component and for the second polymeric component comprises propylene and from 10 to 25 weight % of one or more C2 and/or C4 to C10 alpha- olefin co-monomers. Said elastic spunbonded nonwoven (W) can be easily bonded with polyolefin-based nonwoven layer(s), especially polypropylene-based layer(s), in order to make a composite nonwoven, particularly suitable for the hygienic industry (diapers,...).

L'invention porte sur un non tissé filé-lié (W) à forte recouvrance élastique constitué filaments multicomposants. Chaque filament de préférence du type gaine/âme comporte un premier composant polymérique (P) s'étendant sur la longueur du filament dans au moins une première section du filament, et un deuxième composant polymérique (P') s'étendant sur la longueur du filament dans au moins une deuxième section du filament, distincte de la première. Le composant (P) comprend un copolymère élastique d'oléfine à base de propylène et le composant (P') comprend une oléfine élastique à base de propylène et son indice de fluidité (MFR2) est supérieur à l'indice de fluidité (MFR1) du composant (P'). Le copolymère élastique d'oléfine du premier composant polymérique et du deuxième composant polymérique comprend du propylène et de 10 à 25 % en poids d'un ou plusieurs co-monomères C2 et/ou C4 à C10 d'alpha oléfine. Ledit non tissé filé-lié élastique (W) peut facilement être lié à des couches de non tissé à base de polyoléfines, et spécialement à base de polypropylène pour réaliser un non tissé composite particulièrement adapté à l'industrie des articles d'hygiène (couches, etc).

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