Nonwoven webs of drawn and unoriented thermoplastic fibers

D - Textiles – Paper – 04 – H

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15/118, 18/586

D04H 3/03 (2006.01) B32B 5/02 (2006.01) B32B 5/26 (2006.01) D04H 1/42 (2006.01) D04H 1/54 (2006.01) D04H 3/16 (2006.01)

Patent

CA 2038754

There is disclosed a three dimensional nonwoven web consisting of drawn and unoriented thermoplastic fibers formed from a blend of polypropylene and polybutylene, wherein the blend by weight is from 90% to 70% polypropylene and from 10% to 30% polybutylene. The blend can be a blend of a homopolymer of polypropylene and a homopolymer of polybutylene; a homopolymer of polypropylene and a copolymer of polybutylene; a copolymer of polypropylene and a homopolymer of polybutylene; and a copolymer of polypropylene and a copolymer of polybutylene. In addition, ternary blends comprising polypropylene, polybutylene, and a terpolymer (propylene, ethylene, and 1-butene) are useful. The resulting nonwoven webs have enhanced strength, toughness, and tear resistance.

On présente un voile non tissé tridimensionnel constitué de fibres thermoplastiques étirées et non orientées formé à partir d'un mélange de polypropylène et de polybutylène, où le mélange est constitué, en poids, de 90 % à 70 % de polypropylène et de 10 % à 30 % de polybutylène. Le mélange peut être un mélange d'un homopolymère de polypropylène et d'un homopolymère de polybutylène; d'un homopolymère de polypropylène et d'un copolymère de polybutylène; d'un copolymère de polypropylène et d'un homopolymère de polybutylène; et d'un copolymère de polypropylène et d'un copolymère de polybutylène. De plus, des mélanges ternaires comprenant du polypropylène, du polybutylène et un terpolymère (propylène, éthylène, et 1-butène) sont utiles. Les voiles non tissés ont une résistance, une ténacité et une résistance à la déchirure accrues.

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