A polyolefin composition for preparing fibers, made from or containing: A) 60-95% by weight of a propylene homo- or copolymer; and B) 5-40% by weight of a copolymer of butene-1 or a butene-1 polymer composition having: a Melt Flow Rate value of from 5 to 100 g/10 min., measured according to ISO 1133 at 190? C. with a load of 2.16 kg; a copolymerized comonomer content from 4% to 15% by mole, referred to the total weight of B); a Mw/Mn value equal to or lower than 4; and flexural modulus of 80 MPa or higher.

A polyolefin composition for preparing fibers, made from or containing: A) 60-95% by weight of a propylene homo- or copolymer; and B) 5-40% by weight of a copolymer of butene-1 or a butene-1 polymer composition having: a Melt Flow Rate value of from 5 to 100 g/10 min., measured according to ISO 1133 at 190? C. with a load of 2.16 kg; a copolymerized comonomer content from 4% to 15% by mole, referred to the total weight of B); a Mw/Mn value equal to or lower than 4; and flexural modulus of 80 MPa or higher.

The invention relates to a method for making a nonwoven fabric comprising forming polymer fibers from a melt of the polymer material and using these fibers to obtain a nonwoven fabric during a subsequent nonwoven fabric formation procedure, wherein the melt of the polymer material comprises a melt additive, wherein the method comprises thermal bonding at a temperature higher than 40 C. below the melting point of the polymer material and, additionally, one or both of the following steps: a. improving the mobility of the additive by heat-treating the nonwoven fabric at 100 C. or more for 0.1 seconds or more after the nonwoven fabric formation procedure and/or including a filler having a higher thermal conductivity than the polymer material to the polymer material; b. influencing the polymer crystallinity by including a nucleating agent, branched polymers and/or random co-polymers to the polymer material.

The invention relates to a method for making a nonwoven fabric comprising forming polymer fibers from a melt of the polymer material and using these fibers to obtain a nonwoven fabric during a subsequent nonwoven fabric formation procedure, wherein the melt of the polymer material comprises a melt additive, wherein the method comprises thermal bonding at a temperature higher than 40 C. below the melting point of the polymer material and, additionally, one or both of the following steps: a. improving the mobility of the additive by heat-treating the nonwoven fabric at 100 C. or more for 0.1 seconds or more after the nonwoven fabric formation procedure and/or including a filler having a higher thermal conductivity than the polymer material to the polymer material; b. influencing the polymer crystallinity by including a nucleating agent, branched polymers and/or random co-polymers to the polymer material.

A material web is disclosed. The material web includes a fiber layer having a first side and an opposing second side. The fiber layer has a plurality of fibers, each of which having an intimate admixture of a thermoplastic polymer, and a wax and/or oil, wherein at least some of the wax and/or oil is exposed at an outer surface of the fibers. A surface energy treatment is disposed on the first side and/or the second side of the fiber layer.

A material web is disclosed. The material web includes a fiber layer having a first side and an opposing second side. The fiber layer has a plurality of fibers, each of which having an intimate admixture of a thermoplastic polymer, and a wax and/or oil, wherein at least some of the wax and/or oil is exposed at an outer surface of the fibers. A surface energy treatment is disposed on the first side and/or the second side of the fiber layer.

The invention is contemplated for providing polyethylene-based fibers in which elution of metal from polyethylene is suppressed as much as possible. The invention relates to polyethylene-based fibers, composed of at least one kind of polyethylene resin, in which a total of content of metal elements such as Na, K, Ca, Fe, Cu, Mg, Mn, Li, Al, Cr, Ni and Zn contained inside the fibers is 40 ppm or less. Moreover, the invention relates to a nonwoven fabric using the polyethylene-based fibers.

The invention is contemplated for providing polyethylene-based fibers in which elution of metal from polyethylene is suppressed as much as possible. The invention relates to polyethylene-based fibers, composed of at least one kind of polyethylene resin, in which a total of content of metal elements such as Na, K, Ca, Fe, Cu, Mg, Mn, Li, Al, Cr, Ni and Zn contained inside the fibers is 40 ppm or less. Moreover, the invention relates to a nonwoven fabric using the polyethylene-based fibers.

Provided is a nonwoven fabric which is formed from a resin composition and has improved antifouling properties, sound insulation properties, coefficient of friction, and texture. This nonwoven fabric is formed from a resin composition which contains (1) a thermoplastic resin and (2) a fluorine-containing copolymer, and wherein: the thermoplastic resin (1) is a polypropylene; and the fluorine-containing copolymer (2) is a copolymer which has (a) a repeating unit that is formed of a fluorine-containing monomer represented by formula CH.sub.2C(X)C(O)YZRf and (b) a repeating unit that is formed of a non-fluorine monomer having a hydrocarbon group with 14 or more carbon atoms, and which has a weight average molecular weight of 2,500-20,000.

Provided is a nonwoven fabric which is formed from a resin composition and has improved antifouling properties, sound insulation properties, coefficient of friction, and texture. This nonwoven fabric is formed from a resin composition which contains (1) a thermoplastic resin and (2) a fluorine-containing copolymer, and wherein: the thermoplastic resin (1) is a polypropylene; and the fluorine-containing copolymer (2) is a copolymer which has (a) a repeating unit that is formed of a fluorine-containing monomer represented by formula CH.sub.2C(X)C(O)YZRf and (b) a repeating unit that is formed of a non-fluorine monomer having a hydrocarbon group with 14 or more carbon atoms, and which has a weight average molecular weight of 2,500-20,000.