JP5127690B2 - Fiber and non-woven fabric - Google Patents

Description

  The present invention relates to a fiber excellent in initial hydrophilicity and durable hydrophilicity and a nonwoven fabric including such a fiber.

Polypropylene nonwoven fabrics are widely used in various applications because of their excellent breathability, flexibility and lightness. For this reason, the nonwoven fabric is required to have various properties according to its use and to improve the properties.
On the other hand, since a polypropylene nonwoven fabric is essentially hydrophobic, it is essential to perform a hydrophilic treatment in order to use it as a top sheet of sanitary materials such as disposable diapers and sanitary napkins, wipers and the like.

  As a method of hydrophilizing a polypropylene nonwoven fabric, a method of treating the surface of the polypropylene nonwoven fabric with a treatment agent containing a plurality of nonionic surfactants (for example, Patent Document 1; JP 2007-107131 A, Patent Document 2; JP 2003-52752 A), a method of heat-treating a spunbonded nonwoven fabric mixed with a surfactant for at least 30 seconds (Patent Document 3; JP 63-21350 A), or an interface on the sheath of a composite fiber A number of methods have been proposed, such as a method of containing an activator (Patent Document 4: JP-A-2-221448).

  However, the method of treating the surface of the polypropylene nonwoven fabric with the surfactant is excellent in initial hydrophilicity, but the surfactant is likely to flow out, and there is a possibility that the hydrophilicity is lowered when repeatedly used. In the method of kneading, the development of hydrophilicity takes time, and there is a possibility that the initial hydrophilicity is inferior. In particular, a non-woven fabric made of a propylene homopolymer requires a long time for the expression of hydrophilicity, and in order to laminate the non-woven fabric with other members, it takes several days to recover the hydrophilicity when heat treated. Further improvement in hydrophilicity is desired for use in top sheets of sanitary materials such as disposable diapers and sanitary napkins.

JP 2007-107131 A JP 2003-52752 A JP 63-2111350 A JP-A-2-221448

  The inventors of the present invention show that hydrophilicity (initial hydrophilicity) develops in a short time after the production of the nonwoven fabric, and that the hydrophilicity is restored (durable hydrophilicity) in a short time even if the nonwoven fabric is heat-treated. As a result of various studies aimed at developing fibers and nonwoven fabrics suitable for polypropylene nonwoven fabrics that are both excellent in durability and hydrophilic properties, ethylene / α-olefin random copolymers were used as the propylene-based polymer, and surface activity was also achieved. It has been found that the object of the present invention can be achieved by adding and mixing a mixture containing a specific nonionic surfactant as an agent.

The present invention
(1) Nonionic surface activity containing the following A component, B component and C component with respect to 100 parts by weight of a propylene / α-olefin random copolymer having a melting point (Tm) in the range of 125 to 155 ° C. A fiber comprising a propylene copolymer composition containing 0.5 to 5 parts by weight of the agent mixture and a nonwoven fabric containing the fiber.
Component A: Polyoxyethylene alkyl ether Component B: Polyoxyethylene alkylamide Component C: Glycerin monofatty acid ester and
(2) Propylene / α-olefin random copolymer having a core melting point (Tm) in the range of 125 to 155 ° C., and a nonionic surfactant mixture containing the following components A, B and C A core-sheath composite fiber comprising a propylene / α-olefin random copolymer whose sheath has a melting point (Tm) in the range of 125 to 155 ° C., and the core-sheath structure composite fiber as a whole A non-ionic surfactant mixture containing 0.5 to 5 parts by weight of a non-ionic surfactant mixture and 100% by weight of the propylene / α-olefin random copolymer in total, and a non-woven fabric containing the fiber.
Component A: Polyoxyethylene alkyl ether Component B: Polyoxyethylene alkylamide Component C: A glycerin monofatty acid ester is provided.

  The fiber of the present invention and the nonwoven fabric containing the fiber have a very short hydrophilic expression time of 3 hours or less after production, and the hydrophilicity immediately recovers even after heat treatment at 80 ° C. for 2 hours. And excellent durability and hydrophilicity.

  In addition to the above characteristics, the core-sheath composite fiber of the present invention and the non-woven fabric containing the fiber are non-ionic from the surface of the extruded molten resin fiber when the fiber is manufactured in terms of environmental hygiene at the time of manufacture. It has the feature that the evaporation of the surfactant is suppressed, and the generation of smoke and the like is small.

<Propylene / α-olefin random copolymer>
The propylene / α-olefin random copolymer forming the fiber of the present invention and the nonwoven fabric containing the fiber has a melting point (Tm) of 125 to 155 ° C., preferably 130 to 147 ° C., and a small amount of ethylene, Copolymerization with 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene or the like, preferably 2-8, one or more α-olefins A polymer, preferably a random copolymer. The α-olefin content in the propylene / α-olefin random copolymer is not particularly limited as long as the melting point (Tm) is in the above range, but is usually in the range of 1 to 10 mol%.

  The propylene / α-olefin random copolymer according to the present invention usually has a melt flow rate (MFR) (ASTM D-1238, 230 ° C., load 2160 g) of 20 to 100 g / 10 minutes, preferably 40 to 80 g / 10. In the range of minutes. A propylene / α-olefin random copolymer having an MFR of less than 20 g / 10 minutes may have a high melt viscosity and poor spinnability, while a propylene / α-olefin random copolymer having an MFR of more than 100 g / 10 minutes is There exists a possibility that the tensile strength etc. of the fiber obtained and the nonwoven fabric containing the said fiber may be inferior.

  A propylene polymer having a melting point (Tm) exceeding 155 ° C. is inferior in initial hydrophilicity and durable hydrophilicity to the resulting fiber and the nonwoven fabric containing the fiber even when a nonionic surfactant mixture described later is added. On the other hand, a propylene copolymer having a melting point (Tm) of less than 125 ° C. is excellent in initial hydrophilicity and durable hydrophilicity of fibers obtained by adding a nonionic surfactant mixture described later and a nonwoven fabric containing the fibers, Formability and mechanical strength are inferior.

  The melting point (Tm) of the propylene / α-olefin random copolymer according to the present invention is the extreme value of the melting endothermic curve when the temperature is increased at a rate of temperature increase of 10 ° C./min using a differential scanning calorimeter (DSC). The temperature is raised to a temperature about 50 ° C. higher than the temperature at which the temperature is given, and is kept at this temperature for 10 minutes. The melting curve is measured when the temperature is raised to the above temperature, and the temperature (Tp) giving the extreme value of the melting endothermic curve is obtained from the melting curve according to the method of ASTM D3418, and the endothermic peak of the peak temperature is determined as the melting point ( Tm).

<Nonionic surfactant mixture>
The nonionic surfactant mixture according to the present invention contains polyoxyethylene alkyl ether as the A component, polyoxyethylene alkylamide as the B component, and glycerin monofatty acid ester as the C component. The nonionic surfactant mixture according to the present invention is not particularly limited as long as it contains the A component, the B component, and the C component. Usually, the A component is 30 to 60% by weight, and the B component is 20 to 50% by weight. And C component in a range of 20 to 50 wt% [A component + B component + C component = 100 wt%].

<A component>
The component A contained in the nonionic surfactant mixture according to the present invention is polyoxyethylene alkyl ether, and is usually an ethylene oxide adduct of an aliphatic alcohol called AE. The polyoxyethylene alkyl ether according to the present invention is preferably a compound represented by the following general formula (1).
R—O— (CH ₂ CH ₂ O) _x —H Formula (1)
(In the formula, R represents a linear saturated hydrocarbon group having 12 to 30 carbon atoms; x is an integer of 1 to 20)

<B component>
The B component contained in the nonionic surfactant mixture according to the present invention is polyoxyethylene alkylamide. The polyoxyethylene alkylamide according to the present invention is preferably a compound represented by the following general formula (2).
_{R 1 CON- (CH 2 CH 2} O) y -H Formula (2)
_{(CH 2 CH 2 O) z} -H
(In the formula, R ₁ represents a linear saturated hydrocarbon group having 16 to 18 carbon atoms; y and z are each an integer of 1 or more which may be the same or different, and x + y is 5 or more. 10 or less.)

<C component>
The C component contained in the nonionic surfactant mixture according to the present invention is glycerin monofatty acid ester. The glycerin monofatty acid ester according to the present invention is preferably a glycerin monofatty acid ester having 16 to 18 carbon atoms of a linear saturated fatty acid.

  The nonionic surfactant mixture according to the present invention includes other nonionic surfactants such as an alkylene oxide adduct of a fatty acid or an alkylene oxide adduct of a fatty acid amide within the range not impairing the object of the present invention. You may mix | blend as needed.

<Propylene copolymer composition>
The propylene copolymer composition forming the fiber of the present invention and the nonwoven fabric containing the fiber is 0.5 parts of the nonionic surfactant mixture with respect to 100 parts by weight of the propylene / α-olefin random copolymer. It is a composition containing -5 parts by weight, preferably 1-3 parts by weight.

  When the amount of the nonionic surfactant mixture is less than 0.5 parts by weight, the hydrophilicity is poor. On the other hand, the upper limit is not particularly limited, but when it exceeds 5 parts by weight, the hydrophilicity is saturated and the amount of the surfactant that exudes to the surface of the obtained fiber and the nonwoven fabric containing the fiber increases, and the molding processability Decreases.

  When preparing the propylene copolymer composition according to the present invention, the nonionic surfactant mixture as a pellet-like masterbatch containing 5% by weight, for example, containing 10 to 70% by weight in a high concentration It is preferable to add a nonionic surfactant mixture and mix with the propylene / α-olefin random copolymer during the production of fibers and nonwoven fabrics. The propylene polymer used in the master batch of the nonionic surfactant mixture is not limited to the propylene / α-olefin random copolymer, but propylene homopolymer or propylene / α having a melting point (Tm) outside the above range. -An olefin random copolymer may be used. Such a propylene-based polymer can appropriately select MFR depending on the target fiber and the nonwoven fabric containing the fiber.

  In the propylene copolymer composition according to the present invention, usually used antioxidants, weathering stabilizers, light stabilizers, antiblocking agents, lubricants, nucleating agents, pigments, etc., as long as the object of the present invention is not impaired. Additives or other polymers such as propylene homopolymers and ethylene polymers can be blended as required.

<Fiber and non-woven fabric>
The fiber of this invention and the nonwoven fabric containing the said fiber are the nonwoven fabric containing the fiber of the propylene copolymer composition containing the said propylene alpha-olefin random copolymer and the said nonionic surfactant mixture, and the said fiber.

  Moreover, as another aspect of the fiber of this invention and the nonwoven fabric containing the said fiber, the propylene copolymer composition in which a core part contains the said propylene * alpha-olefin random copolymer and the said nonionic surfactant mixture. And a sheath is a core-sheath conjugate fiber made of the propylene / α-olefin random copolymer and a nonwoven fabric containing the conjugate fiber. The core-sheath conjugate fiber of the present invention usually has a core / sheath weight ratio in the range of 10/90 to 50/50. When the ratio of the core part which consists of a propylene copolymer composition containing the said nonionic surfactant mixture is less than 10, there exists a possibility that the hydrophilic expression time after manufacture may become long. The core-sheath conjugate fiber of the present invention may be either concentric or eccentric as long as the sheath part that does not contain the nonionic surfactant mixture covers most of the fiber surface. A concentric core is preferred when suppressing fuming due to evaporation of the activator mixture.

  When using the core-sheath conjugate fiber as the fiber of the present invention and the nonwoven fabric containing the fiber, the nonionic surfactant is added to 100 parts by weight of the propylene / α-olefin random copolymer contained in the entire core-sheath conjugate fiber. The agent mixture is included in the range of 0.5 to 5 parts by weight, preferably 1 to 3 parts by weight. Therefore, the amount of the nonionic surfactant mixture contained in the composition containing the propylene / α-olefin random copolymer and the nonionic surfactant mixture to be the core is the core of the sheath-core composite fiber. Depending on the weight ratio of the sheath part (10/90 to 50/50), it will be contained more than the above range.

  The fiber of the present invention usually has a fineness of 0.5 to 5 denier, preferably 0.5 to 3 denier. Although the fiber of the present invention may be a short fiber, it is preferable that the fiber is a long fiber because the fiber does not fall off from the resulting nonwoven fabric.

The nonwoven fabric of the present invention usually has a basis weight of 3 to 100 g / m ² , preferably 7 to 60 g / m ² . The non-woven fabric of the present invention is preferably a long-fiber non-woven fabric because there is no loss of fibers.
The nonwoven fabric of the present invention is partially used by various known entanglement methods, for example, a method using means such as needle punching, water jet, and ultrasonic waves, or hot embossing using an embossing roll or hot air through. It may be entangled by a method of heat fusion. Such entanglement methods may be used alone or in combination with a plurality of entanglement methods.

  When heat-sealing by hot embossing, the embossed area ratio is usually in the range of 5 to 30%, preferably 5 to 20%. Examples of the stamped shape include a circle, an ellipse, an ellipse, a square, a rhombus, a rectangle, a square, and a continuous shape based on these shapes.

The nonwoven fabric of the present invention may be used alone or laminated with other layers depending on various applications.
Specifically, the other layer laminated | stacked with the nonwoven fabric of this invention can mention a knitted fabric, a woven fabric, a nonwoven fabric, a film etc., for example. When laminating (bonding) the nonwoven fabric of the present invention and other layers, thermal embossing, thermal fusion methods such as ultrasonic fusion, mechanical entanglement methods such as needle punch and water jet, hot melt adhesive, Various known methods such as a method using an adhesive such as a urethane-based adhesive, extrusion lamination, and the like can be adopted. The non-woven fabric of the present invention is highly convenient in terms of product quality control because the hydrophilicity is restored in a short time even after a process of contacting with a high-temperature substance such as a hot-melt adhesive or an extrusion laminate.

  Examples of the nonwoven fabric laminated with the nonwoven fabric of the present invention include other known nonwoven fabrics such as other spunbond nonwoven fabrics, melt blown nonwoven fabrics, wet nonwoven fabrics, dry nonwoven fabrics, dry pulp nonwoven fabrics, flash spun nonwoven fabrics, and spread nonwoven fabrics.

  Examples of the material constituting such a nonwoven fabric include various known thermoplastic resins such as ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, and 1-octene. High pressure low density polyethylene, linear low density polyethylene (so-called LLDPE), high density polyethylene, polypropylene, polypropylene random copolymer, poly 1-butene, poly 4-methyl-1-pentene, ethylene / propylene random Polyolefin such as copolymer, ethylene / 1-butene random copolymer, propylene / 1-butene random copolymer, polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon- 66, poly Data xylene adipamide, etc.), polyvinyl chloride, polyimide, ethylene-vinyl acetate copolymer, polyacrylonitrile, polycarbonate can be exemplified polystyrene, ionomers, thermoplastic polyurethane, or mixtures thereof. Among these, high pressure method low density polyethylene, linear low density polyethylene (so-called LLDPE), high density polyethylene, polypropylene, polypropylene random copolymer, polyethylene terephthalate, polyamide and the like are preferable.

  When a nonwoven fabric made of crimped fibers is used as another spunbond nonwoven fabric laminated with the nonwoven fabric of the present invention, the resulting laminate is excellent in flexibility, bulkiness, and touch. Moreover, when the thing which extended | stretched the nonwoven fabric which consists of a mixed fiber of each thermoplastic resin and thermoplastic elastomer is used, in addition to the said characteristic, the laminated body obtained is excellent in a stretching property.

When the nonwoven fabric of the present invention is used for a disposable diaper top sheet, a second sheet or a sheet (core wrap) for wrapping an absorbent body, 0.7 to 3 parts by weight of a nonionic surfactant mixture and a fineness of 0.5 to 3 denier The basis weight is preferably in the range of 7 to 30 g / m ² .

Moreover, when using the sheet | seat (core wrap) containing the absorber of an absorbent article, you may laminate | stack and use the nonwoven fabric of this invention with the said melt blown nonwoven fabric.
The film laminated with the nonwoven fabric of the present invention is preferably a breathable (moisture permeable) film that takes advantage of the hydrophilicity that is characteristic of the nonwoven fabric of the present invention. Examples of such a breathable film include various known breathable films, for example, films made of thermoplastic elastomers such as moisture-permeable polyurethane elastomers, polyester elastomers, polyamide elastomers, and thermoplastic resins containing inorganic or organic fine particles. Examples thereof include a porous film formed by stretching a film to be porous. The thermoplastic resin used for the porous film is preferably a polyolefin such as high-pressure method low-density polyethylene, linear low-density polyethylene (so-called LLDPE), high-density polyethylene, polypropylene, polypropylene random copolymer, or a composition thereof.

<Nonwoven Fabric Manufacturing Method>
When short fibers are used as the raw material for the nonwoven fabric, they can be produced by various known production methods, for example, a wet method or a dry method (card).

<Method for producing long-fiber nonwoven fabric>
The long-fiber nonwoven fabric of the present invention can be produced by various known methods for producing nonwoven fabrics, but the method produced by the spunbond method is preferred in terms of excellent productivity.

  When producing the long-fiber nonwoven fabric of the present invention by the spunbond method, when producing a spunbond nonwoven fabric composed of single fibers of the propylene copolymer composition, the spunbond nonwoven fabric composed of core-sheath composite fibers with one extruder. Is produced, the propylene / α-olefin random copolymer forming the core and the propylene copolymer composition containing the nonionic surfactant mixture, and the propylene / α- forming the sheath. The olefin random copolymer was melted at 180 to 250 ° C., preferably 190 to 230 ° C., in separate extruders, and set to 180 to 250 ° C., preferably 190 to 230 ° C. having a (composite) spinning nozzle. A (composite) fiber is spun and spun by discharging from the spinneret at a single hole discharge rate of 0.4 to 1.5 g / min, preferably 0.5 to 0.8 g / min. The (composite) fiber is cooled by cooling air at 10 to 40 ° C., preferably 20 to 30 ° C., and the (composite) fiber is pulled and thinned by high-speed air at 2000 to 7000 m / min, preferably 3000 to 6000 m / min. And then using a method such as needle punching, water jet, ultrasonic, etc., or hot embossing using an embossing roll. It can be manufactured by entanglement by an entanglement method such as a method of partially heat-sealing by using processing or hot air through.

EXAMPLES Hereinafter, although this invention is demonstrated further more concretely based on an Example, this invention is not limited to these Examples.
In addition, the physical-property value etc. in an Example and a comparative example were measured with the following method. Further, in the following measurement of (1) repeated absorption rate and (2) liquid flow distance, an aqueous solution (9 g / liter) having a surface tension of 70 +/− 2 mN / m sodium chloride was used as artificial urine.

  The measurement of (1) repeated absorption rate and (2) liquid flow distance is within 48 hours (no heat treatment) after 24 hours from the production of the long fiber nonwoven fabric, and 24 after the long fiber nonwoven fabric is produced. The long-fiber non-woven fabric that had passed for more than an hour was subjected to heat treatment at a set temperature of 80 ° C. for 2 hours and then taken out and measured under two conditions within 2 hours (with heat treatment).

(1) Repeating absorption rate A sample (50 mm × 200 mm) was collected from the long fiber nonwoven fabric. No. made by Advantech Two 10 filter papers were stacked and the sample was placed horizontally on it. One drop (about 0.3 ml) of artificial urine was left at 10 points with a dropper from a height of about 10 mm above the sample surface, and the number of drops absorbed within 2 seconds was measured. This was repeated three times every 3 minutes, and the total number of absorbed liquid droplets was divided by 30 to obtain a repetition rate (%). It was evaluated that the larger this value, the better the hydrophilicity.

(2) Liquid flow distance A sample (50 mm x 200 mm) was collected from the long fiber nonwoven fabric. No. made by Advantech Co., Ltd. on a plate fixed at an angle of 45 degrees. Two pieces of two filter papers were placed on top of each other, a sample was placed thereon, and both ends in the longitudinal direction of the sample were fixed on the plate together with the filter paper. Drop one drop (about 0.3 ml) of artificial urine with a dropper from a height of about 10 mm above the sample surface, measure the distance from the drop point to the point where the drop is completely absorbed, and the liquid flow The distance (mm) was used. The smaller this value, the better the hydrophilicity.

(3) Weight per unit (g / m ² )
Ten samples of 100 mm × 100 mm were collected from an arbitrary position of the long fiber nonwoven fabric, and each mass (g) was measured. Their average values were obtained and converted to mass per 1 m ² to obtain basis weight (g / m ² ).

[Example 1]
Nonionic system containing polyoxyethylene (5 mol) stearyl ether: 50% by weight as component A, polyoxyethylene (10 mol) stearyl amide: 25% as component B, and glycerin monostearate: 25% by weight as component C Surfactant mixture: 20% by weight, MFR: 60 g / 10 min propylene homopolymer: 80% by weight of an antioxidant (Ciba, trade name Irgafos 168) was added at 0.05 parts by weight, at 230 ° C. The mixture was melt-kneaded and extruded to prepare a pellet master batch (hydrophilic agent-1).

  Next, 8.1 parts by weight of the hydrophilic agent-1 was added to 100 parts by weight of the propylene / ethylene random copolymer (PP-1) having a melting point (Tm): 142 ° C. and an MFR: 60 g / 10 min and mixed. And the propylene copolymer composition (composition-1) for long-fiber nonwoven fabric manufacture was prepared.

Subsequently, composition-1 was melt-spun by a spunbond method to obtain long fibers. At this time, white smoke derived from the hydrophilic agent-1 was generated from the spinning nozzle outlet. Subsequent to spinning, hot embossing was performed to obtain a long fiber nonwoven fabric having a basis weight of 20 g / m ² . Next, using an embossing roll with an engraved shape of rhombus, an embossed area ratio of 18%, and an embossed area (area per imprinted) of 0.41 mm ² , the temperature of the embossing roll and the smooth roll was 125 ° C., and the linear pressure was Heat embossing was performed at 60 N / mm. After 24 hours from the production of the long fiber nonwoven fabric, the absorption rate and the liquid flow distance were measured repeatedly within 48 hours (no heat treatment). In addition, a long-fiber non-woven fabric that has passed 24 hours or more after production is hung near the center in an oven (Espec Corp., Tabai Safety Oven STS222), heat-treated at a set temperature of 80 ° C. for 2 hours, and then taken out for 2 hours. The same measurement was performed within (with heat treatment). The results are shown in Table 1.

[Comparative Example 1]
In Example 1, a propylene homopolymer (PP-2) having a melting point of 162 ° C. and MFR of 60 g / 10 min was used instead of PP-1, and the temperature of the embossing roll and the smooth roll was 133 ° C. A long fiber nonwoven fabric was obtained in the same manner as in Example 1. About the obtained long fiber nonwoven fabric, the same measurement as Example 1 was performed. The results are shown in Table 1.

[Example 2]
In Example 1, 33.3 parts by weight of hydrophilic agent-1 was added to 100 parts by weight of PP-1 and mixed to obtain a propylene copolymer composition (composition-2) for producing a long-fiber nonwoven fabric. Except for composite melt spinning using a core-sheath type composite nozzle with the core as composition-2, the sheath as PP-1, and the core / sheath weight ratio as 30/70, the same as in Example 1. A long fiber nonwoven fabric was obtained. At this time, no white smoke was generated at the spinning nozzle outlet. About the obtained long fiber nonwoven fabric, the same measurement as Example 1 was performed. The results are shown in Table 1.

From Table 1, the long-fiber non-woven fabric (Comparative Example 1) obtained by adding (Hydrophilic Agent-1) as a hydrophilic agent to a propylene homopolymer (PP-2) having a melting point of 162 ° C. is related to the presence or absence of heat treatment. It is clear that the repetitive absorption rate is 0%, the liquid flow distance test does not absorb, and the initial hydrophilicity and durability hydrophilicity are poor.
On the other hand, the long-fiber nonwoven fabric (Example 1) using the propylene / ethylene random copolymer (PP-1) having a melting point (Tm) of 142 ° C. has a repetitive absorption rate of 100% before the heat treatment, and the liquid flow. The distance is 15 mm, which is excellent in initial hydrophilicity, and even after heat treatment, the repetitive absorption rate is maintained at 100%, and the liquid flow distance is not decreased, and it is clear that the hydrophilicity is excellent.
Also, composition-2, in which hydrophilic agent-1 is added to propylene / ethylene random copolymer (PP-1) having a melting point (Tm) of 142 ° C., is used for the core portion, and the hydrophilic agent is added to PP-1 for the sheath portion. The long-fiber non-woven fabric (Example 2) composed of core-sheath composite long fibers obtained without addition has a 100% repeat absorption rate after heat treatment and a short liquid flow distance, and also produces a long-fiber non-woven fabric. It is clear that it has the feature that the generation of white smoke at the time can be prevented.

  The long fiber nonwoven fabric of the present invention is excellent not only in the initial hydrophilicity but also in the durable hydrophilicity. Therefore, the top sheet of the absorbent article such as disposable diapers and sanitary products, the second sheet or the sheet (core / wrap) that wraps the absorbent body It is particularly useful as a medical device, a sanitary material, a packaging material, an industrial material and the like. Specific applications include sheets, pet sheets, vegetable soup dipping sheets, meat and fish drip sheets, coffee filters, gowns, towels, poultices, work clothes, wipers, wet tissues, gauze, cloths, towels, buttocks Wipes, toilet cleaners, flooring cleaners, range cleaners, makeup removers, glasses wipes, and the like.

Claims (5)

A nonionic surfactant mixture containing the following A component, B component and C component with respect to 100 parts by weight of a propylene / α-olefin random copolymer having a melting point (Tm) in the range of 125 to 155 ° C. A fiber comprising a propylene copolymer composition containing 0.5 to 5 parts by weight.
Component A: Polyoxyethylene alkyl ether Component B: Polyoxyethylene alkylamide Component C: Glycerin monofatty acid ester A propylene copolymer comprising a propylene / α-olefin random copolymer having a core having a melting point (Tm) in the range of 125 to 155 ° C. and a nonionic surfactant mixture containing the following components A, B and C: Polymer composition, core-sheath composite fiber comprising a propylene / α-olefin random copolymer having a sheath part having a melting point (Tm) in the range of 125 to 155 ° C., and propylene contained in the core-sheath composite fiber -The fiber which contains 0.5-5 weight part of nonionic surfactant mixtures with respect to a total of 100 weight part of (alpha) -olefin random copolymers.
Component A: Polyoxyethylene alkyl ether Component B: Polyoxyethylene alkylamide Component C: Glycerin monofatty acid ester   The nonionic surfactant mixture is A component: 30 to 60% by weight, B component: 20 to 50% by weight, and C component: 20 to 50% by weight [A component + B component + C component = 100% by weight] Item 3. The fiber according to Item 1 or 2.   The fiber according to any one of claims 1 to 3, wherein the fiber is a long fiber.   The nonwoven fabric which consists of a fiber in any one of Claims 1-4.