TWI546435B - Durable hydrophilic fiber with excellent color fastness, and fiber forming body constituted by the same and absorbing article - Google Patents

Description

Durable hydrophilic fiber excellent in discoloration resistance, fiber molded body composed of the same, and absorbent article

The present invention relates to a fiber having durable hydrophilicity which is excellent in discoloration resistance. Further, the present invention relates to a fiber molded body comprising a fiber having durable hydrophilicity excellent in discoloration resistance, for example, a nonwoven fabric, and an absorbent article using the fiber or the fiber molded body.

The heat-bonding fiber which can be formed by hot-melt using hot air such as hot air or a heat roller is widely used for sanitary materials such as diapers, sanitary napkins, pads, etc., or household goods or filtration because it is easy to obtain bulkiness. Industrial materials such as equipment. In particular, sanitary materials require high liquid absorption because they must quickly and repeatedly absorb liquids such as urine and menstrual blood.

On the other hand, in the thermal adhesive fiber, an antioxidant such as dibutylhydroxytoluene is added and contained in order to prevent deterioration due to the generation of radicals, and the place where the sunlight is irradiated or the fluorescent lamp is positive. Long-term storage underneath is prone to discoloration and frequently causes damage to product quality.

Therefore, there is a proposal to improve the discoloration resistance by adding a hydroxycarboxylic acid to the fiber treatment agent attached to the surface of the fiber (for example, Patent Document 1). In addition, there is a proposal to prevent yellowing which occurs during fiber production or storage by using an alkyl ammonium phosphate in a fiber treatment agent (for example, Patent Document 2).

On the other hand, there is a proposal to attach a higher alcohol sulfate and an alkyl phosphate metal salt to a fiber in order to increase the hydrophilicity of the fiber and to prevent rust from being produced when the nonwoven fabric is produced (for example, Patent Document 3); Salt, poly The oxyethylene alkyl sulfate and the polyoxyethylene alkyl phosphate are components of the fiber treating agent (for example, Patent Document 4).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 4381579

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2001-140168

[Patent Document 3] Japanese Patent Laid-Open No. Hei 8-141012

[Patent Document 4] Japanese Patent Laid-Open Publication No. 2004-76165

Although there is a proposal to improve the discoloration resistance of fibers by the prior art, the hydrophilicity of the hydroxycarboxylic acid has a low function, and thus the liquid absorbing property of the fibers may be impaired. Further, the alkyl ammonium phosphate has a low function of imparting durable hydrophilicity, and it is difficult to obtain high durability hydrophilicity.

Therefore, there is a strong demand for a fiber which has both excellent discoloration resistance and durable hydrophilicity.

Here, the term "liquid absorbing property" refers to a state in which a liquid molded body such as a nonwoven fabric is placed on an absorbent layer such as a paper sheet, and a liquid such as urine or menstrual blood is contacted (dropped, etc.) from the side of the nonwoven fabric or the like. The ability to move the liquid toward the absorbent layer quickly. This liquid absorbency is also referred to as liquid permeability, liquid permeability, and the like. In addition, the term "permanent hydrophilicity" as used herein means a liquid absorbing property which is repeated.

In view of such a problem, an object of the present invention is to provide a fiber which is extremely excellent in discoloration resistance and has high durability and hydrophilicity, and a fiber molded body composed of such a fiber, for example, a nonwoven fabric, and further provides a fiber or fiber molding. Body absorbent article.

The inventors of the present invention have conducted intensive studies in order to solve the above problems. As a result, it has been found that the above problem can be attained by adhering a fiber treating agent containing a specific sulfate salt, a sulfosuccinate diester salt, and a phosphate salt each in a predetermined amount or more.

Therefore, the present invention has the following constitution.

[1] A fiber containing at least one thermoplastic resin and having a fiber treatment agent containing a component (A) or a component of 5% by mass or more of 25% by mass or less based on the active ingredient. B) and 5% by mass or more of the component (C), and 0.1% by mass to 1.0% by mass of the fiber treating agent adhered to the fiber mass, and the component (A): sulfuric acid having a hydrocarbon group having 8 to 22 carbon atoms An ester salt; a component (B): a sulfosuccinic acid diester salt having a hydrocarbon group having 12 to 20 carbon atoms; and a component (C): a phosphate salt having a hydrocarbon group having 4 to 18 carbon atoms.

[2] The fiber according to the above [1], wherein the composition ratio (% by mass) of the component (A) and the component ratio (C) of the component (A) in the fiber treating agent are as follows: Formula: Composition ratio of component (A) 构成 component ratio of component (C).

[3] A fiber formed body comprising the fiber according to [1] or [2] as a main component.

[4] The fibrous formed body according to [3], which is a non-woven fabric.

[5] An absorbent article using the fiber according to [3] or [4] Obtained from a molded body.

According to the present invention, by attaching a fiber treating agent containing a specific amount of a specific sulfate salt, a sulfosuccinate diester salt, and a phosphate salt to a fiber, it is possible to obtain excellent discoloration resistance and absorb A fiber that is excellent in liquidity and durability and hydrophilicity. According to the present invention, a fiber molded body having excellent discoloration resistance and excellent durability and hydrophilicity, such as a nonwoven fabric, which is excellent in discoloration resistance and durable hydrophilicity, can be obtained. Absorbent items.

According to the present invention, in particular, by combining the following fibers with the above-mentioned fiber treating agent, an unexpectedly excellent effect can be exerted, that is, a high durability hydrophilicity which has not existed before is obtained, and at the same time, excellent discoloration resistance is obtained, The fiber is a fiber (including a composite fiber) in which at least a part of the surface of the fiber is exposed to a thermoplastic resin having propylene as a main component, which is extremely difficult to obtain, and is, for example, a composite fiber, and the sheath/core is made of ethylene. A propylene-butene-1 copolymer/polypropylene-like composite fiber.

According to the present invention, it is possible to provide a fiber, a fiber molded body, and an absorbent article which are excellent in both discoloration resistance and durable hydrophilicity.

Hereinafter, the present invention will be described in detail.

The fiber of the present invention contains at least one thermoplastic resin, and a fiber treating agent containing the component (A) or the component (B) of 5% by mass or more and 5% by mass or more of the following 25% by mass or more based on the active ingredient. 5% by mass or more of the component (C), and 0.1 mass attached to the fiber mass The fiber treating agent is in an amount of from 0.01% by mass to 1.0% by mass.

Ingredient (A): a sulfate salt having a hydrocarbon group having a carbon number of 8 to 22

Ingredient (B): a sulfosuccinic acid diester salt having a hydrocarbon group having 12 to 20 carbon atoms

Ingredient (C): a phosphate salt having a hydrocarbon group having 4 to 18 carbon atoms

Here, the active ingredient means a component obtained by removing moisture from the entire fiber treatment agent. In addition, the reference of the effective component is based on the total mass of the component obtained by removing moisture from the entire fiber treatment agent.

The component (A) constituting the fiber treating agent attached to the fiber of the present invention is a sulfate ester salt having a hydrocarbon group having 8 to 22 carbon atoms. The hydrocarbon group may be linear or branched, and may be saturated or unsaturated. Such a sulfate salt can be produced, for example, by sulfating an alcohol having 8 to 22 carbon atoms.

The component (A) may be a single compound or a mixture of two or more compounds. Examples of the component (A) include octyl sulfate, lauryl sulfate, stearyl sulfate, and behenyl sulfate.

As the component (A), a sulfate ester salt of an alkylene oxide adduct having a polyoxyalkylene group added to the hydrocarbon group via an oxygen atom can be used. Such a sulfate salt can be produced, for example, by sulfating a polyoxyalkylene alkyl ether having a hydrocarbon group having 8 to 22 carbon atoms. Examples of such a compound include a polyoxyalkylene alkyl ether sulfate salt, a polyoxyalkylene alkenyl ether sulfate salt, and a polyoxyalkylene alkynyl ether sulfate salt. Specific examples thereof include polyoxyethylene lauryl ether sulfate, polyoxyethylene stearyl ether sulfate, polyoxyethylene oleyl ether sulfate, polyoxypropylene lauryl ether sulfate, and the like. The number of moles of alkylene oxide addition is not particularly limited, but is usually 2 to 10.

The hydrocarbon group preferably has a carbon number of 12 to 18 from the viewpoint of imparting durable hydrophilicity to the fiber. Further, in terms of discoloration resistance, the hydrocarbon group is preferably an unsaturated substance, and the component (A) is particularly preferably an oil-based sulfate.

The cation of the sulfate salt of the component (A) is not particularly limited, and from the viewpoint of water solubility, a metal cation is preferable, and examples thereof include alkali metal ions such as sodium ion, potassium ion, and lithium ion. Among them, sodium ion is particularly preferable from the viewpoint of compatibility with a sulfate group.

The component (A) constituting the fiber treatment agent adhering to the fiber of the present invention must be 25% by mass or more of the active ingredient of the fiber treatment agent. The component (A) is usually in the range of 25% by mass to 80% by mass based on the active ingredient of the fiber treating agent. When the composition ratio of the component (A) is 25% by mass or more, the effect of the discoloration resistance is sufficient, and it is preferably in the range of 30% by mass to 50% by mass.

The component (B) constituting the fiber treating agent attached to the fiber of the present invention is a sulfosuccinic acid diester salt having a hydrocarbon group having 12 to 20 carbon atoms. The hydrocarbon group may be linear or branched, and may be saturated or unsaturated. Further, the two hydrocarbon groups may be the same or different. As the component (B), a single compound or a mixture of two or more compounds may be used. Examples of the component (B) include dilauryl sulfosuccinate, ditridecylsulfosuccinate, distearylsulfosuccinate, and the like.

From the viewpoint of imparting durable hydrophilicity to the fiber, the hydrocarbon group preferably has a carbon number of 12 to 18, particularly preferably ditridecylsulfosuccinate.

The cation of the sulfosuccinic acid diester salt of the component (B) is not particularly limited, and from the viewpoint of water solubility, a metal cation is preferable, for example. Examples thereof include alkali metal ions such as sodium ions, potassium ions, and lithium ions. Among them, sodium ion is particularly preferable from the viewpoint of compatibility with a sulfo group.

The component (B) constituting the fiber treating agent attached to the fiber of the present invention must be 5% by mass or more based on the active ingredient of the fiber treating agent. The component (B) is usually in the range of 5% by mass to 50% by mass based on the active ingredient of the fiber treating agent. When the composition ratio of the component (B) is 5% by mass or more, the effect of the durable hydrophilicity is sufficient, and it is preferably in the range of 10% by mass to 30% by mass.

The ratio of the sulfate salt of the component (A) to the sulfosuccinic acid diester salt of the component (B) is not particularly limited, and in terms of durability hydrophilicity, it is preferably 1:1 to 8:1 by mass ratio. The range is particularly good for the range of 1:1~3:1.

The component (C) constituting the fiber treating agent attached to the fiber of the present invention is a phosphate salt having a hydrocarbon group having 4 to 18 carbon atoms. The hydrocarbon group may be linear or branched, and may be saturated or unsaturated. Such a phosphate salt can be produced, for example, by phosphorylating an alcohol having 4 to 18 carbon atoms. The phosphate salt can be a monoester or diester salt.

As the component (C), a single compound or a mixture of two or more compounds may be used. Examples of the component (C) include hexyl phosphate, octyl phosphate, lauryl phosphate, stearyl phosphate, and the like.

As the component (C), a phosphate salt of an alkylene oxide adduct having a polyoxyalkylene group added to the hydrocarbon group via an oxygen atom can be used. For example, it can be produced by phosphorylating a polyoxyalkylene alkyl ether having a hydrocarbon group having 8 to 22 carbon atoms. Examples of such a compound include a polyoxyalkylene alkyl ether phosphate salt, a polyoxyalkylene alkenyl ether phosphate salt, and a polyoxyalkylene alkynyl ether phosphate salt. With The body can be exemplified by polyoxyethylene octyl ether phosphate salt, polyoxyethylene lauryl ether phosphate salt, polyoxyethylene stearyl ether phosphate salt, polyoxypropylene lauryl ether phosphate salt, and the like. The alkylene oxide addition mole number is usually from 2 to 10.

From the viewpoint of imparting antistatic properties to the fibers, the hydrocarbon group preferably has a carbon number of 8 to 16, and particularly preferably an octyl phosphate.

The cation of the phosphate salt of the component (C) is not particularly limited, and from the viewpoint of water solubility, a metal cation is preferable, and examples thereof include alkali metal ions such as sodium ion, potassium ion, and lithium ion. Among them, potassium ions having good compatibility with a phosphate group are particularly preferred.

The component (C) constituting the fiber treatment agent adhering to the fiber of the present invention must be 5% by mass or more based on the active ingredient of the fiber treatment agent. The component (C) is usually in the range of 5% by mass to 40% by mass based on the active ingredient of the fiber treating agent. When the composition ratio of the component (C) is 5% by mass or more, a sufficient antistatic effect is exhibited, and it is preferably in the range of 10% by mass to 30% by mass.

In the fiber of the present invention, the fiber treating agent is applied in an amount of 0.1% by mass to 1.0% by mass based on the active ingredient thereof, preferably 0.3% by mass to 0.8% by mass. When the amount of adhesion is 0.1% by mass or more with respect to the fiber, it is preferable that the antistatic property is sufficient, and no static electricity is generated in the step of processing the fiber to which the fiber treatment agent adheres into a fiber molded body such as a nonwoven fabric. Processing becomes easy. In addition, when the amount of adhesion is 1.0% by mass or less, in the step of processing the fiber, the fiber treatment agent is less likely to be detached from the fiber, and the accumulation in the machine does not increase, and the workability is not deteriorated, which is preferable.

In the fiber molded article of the present invention, for example, in the nonwoven fabric, it is preferred that the fiber treating agent adheres to 0.1% by mass to 1.0% by mass based on the active ingredient.

In order to make the fiber more excellent in both discoloration resistance and durable hydrophilicity, it is preferred to use the component (A) or the amount of the component (C) in an amount equivalent to the component (C) in the fiber treatment agent. Use ingredient (A). In other words, the following relationship is established between the composition ratio (% by mass) of the component (A) and the component ratio (% by mass) of the component (C) based on the active ingredient in the fiber treatment agent.

Composition ratio of component (A) 构成 component ratio of component (C)

As a state in which the fiber treating agent is attached to the fiber, the fiber treating agent can be attached to the fiber, and then the fiber can be processed into a fiber molded body as needed. Alternatively, the fiber treatment agent may be attached to the fiber formed body after the fiber is processed into a fiber formed body.

The fiber molded body of the present invention, for example, a nonwoven fabric, can be produced by a suitable step using a fiber to which the fiber treating agent is attached, or can be produced by processing a fiber by a suitable step to obtain a fiber formed body. The fiber treatment agent is adhered to the obtained fiber molded body. For example, when the fiber treatment agent is attached to a fiber molded body such as a nonwoven fabric, it is of course possible to uniformly adhere to the entire body, and if necessary, it may adhere to any portion, and the adhered portions may have a poor adhesion amount.

Specifically, the fiber treatment agent can be adhered to a fiber molded body such as a fiber or a nonwoven fabric in an emulsion state diluted to a concentration of 3% by mass to 30% by mass by ion-exchanged water or the like. The fiber treatment agent may be attached to the fiber production step, the so-called spinning step, the stretching step, and the crimping step, and the fiber may be added. After the fiber-formed body is processed, for example, the fiber is made into a non-woven fabric, and the nonwoven fabric is adhered to the nonwoven fabric so that the amount of adhesion becomes a desired range. A method of adhering the fiber treatment agent to the fiber can be carried out by a known method such as an oiling roll method, a dipping method, or a spray method. Further, for example, a method of adhering the fiber treatment agent to the nonwoven fabric may be an oil roller method (coating method), a dipping method, a spray method, or the like, and the corrugated discharge treatment may be performed on the nonwoven fabric in order to improve the adhesion efficiency or the fixing property. Normal piezoelectric discharge treatment is used as a pretreatment.

When the amount of adhesion of the fiber treatment agent to the fiber or the fiber molded body is adjusted by a roller such as an oil roller, it can be adjusted by the rotation speed of the roller or the like, and when it is adhered by a spray method, It is adjusted by the amount of spray or the like.

A method of quantitatively confirming the amount of the fiber treatment agent attached to the fiber is an extraction method using a solvent. After immersing a predetermined amount of fibers or fiber molded bodies in a solvent in which a fiber treating agent having a deposition amount is to be confirmed, for example, methanol, ethanol, or 2-propanol, the solvent is volatilized by heat or the like, and the remaining amount is measured. Thereby, the amount of adhesion of the fiber treating agent per unit mass can be confirmed. Specifically, a rapid method and a Soxhlet method can be cited.

In the fiber treatment agent attached to the fiber of the present invention, other known surfactant components can be used within a range that does not impair the effects of the present invention. For example, in terms of durable hydrophilicity, a castor oil ester derivative, a polyoxyethylene castor oil ether derivative, a polyoxyalkylene modified fluorenone, a polyoxyethylene ester, a sorbitan ester, or a 1,3-trioxane may be mentioned. Glycine (betaine), etc., or an ester oil etc. are mentioned about the stability of a fiber processing agent.

In the fiber treatment agent attached to the fiber of the present invention, it can be prevented Various additives are formulated within the scope of the effects of the present invention. Examples of such an additive include an emulsifier, a preservative, a rust preventive, a pH adjuster, and an antifoaming agent.

The fiber of the present invention may be a single component fiber or a composite fiber. The thermoplastic resin to be formed is not particularly limited, and examples thereof include high-density polyethylene, linear low-density polyethylene, low-density polyethylene, polypropylene (propylene homopolymer), and ethylene-propylene copolymerization with propylene as a main component. , ethylene-propylene-1-butene copolymer containing propylene as a main component, polybutene-1, polyhexene-1, polyoctene-1, poly-4-methylpentene-1, polymethyl Polyolefin resin such as pentene, 1,2-polybutadiene, 1,4-polybutadiene, or polyethylene terephthalate, polytrimethylene terephthalate, polyterephthalic acid A polyester resin such as butadiene ester, polylactic acid, polybutylene succinate or polybutylene adipate terephthalate or a copolymerized polyester (copolyester). It may also be a fiber containing a mixture containing two or more kinds of these resins.

In the cross-sectional structure, a conjugate fiber having a concentric sheath core structure, an eccentric sheath core structure, a side-by-side structure, or a split type conjugate fiber such as an alternating radial shape may be used. The shape of the fiber may be, for example, a circle, a star, an ellipse, a triangle, a quadrangle, a pentagon, a multilobal, a hollow or the like. Further, a combination of specific thermoplastic resins of the conjugate fiber (as a sheath/core or a combination of a low melting point component/high melting point component) may be exemplified by high density polyethylene/polypropylene, low density polyethylene/polypropylene, ethylene-octane. Ene copolymer/polypropylene, ethylene-propylene copolymer/polypropylene, ethylene-propylene-butene-1 copolymer/polypropylene, high density polyethylene/polyethylene terephthalate, ethylene-octene copolymer /polyethylene terephthalate, ethylene-propylene-butene-1 copolymer/polyethylene terephthalate, polypropylene/polyethylene terephthalate Ester, high density polyethylene / polybutylene terephthalate, polylactic acid / polybutylene succinate and the like. The ratio of the sheath/core or the low-melting component/high-melting component is preferably in the range of 10/90 to 90/10 by mass ratio, and is particularly preferable in terms of spinnability, elongation, and nonwoven workability. It is in the range of 30/70~70/30.

The effects of the present invention are extremely high and preferable for fibers in which a thermoplastic resin such as polypropylene, an ethylene-propylene copolymer, an ethylene-propylene-butene-1 copolymer or the like having propylene as a main component is on the surface of the fiber. At least a portion of the exposed fibers (including composite fibers). Although the reason is not clear, it is presumed that the thermoplastic resin is particularly excellent in affinity with the fiber treatment agent to be used. In addition, the main component means a component having the highest mass ratio among the constituent components, and preferably accounts for 30% by mass or more. In particular, it is preferred that the thermoplastic resin containing propylene as a main component is continuous in the longitudinal direction of the fiber and accounts for 10% or more of the surface of the fiber, preferably a single fiber of the thermoplastic resin or a sheath component containing the thermoplastic resin. A composite fiber having a concentric sheath core structure or an eccentric sheath core structure, or a split type composite fiber containing the thermoplastic resin as a composite component.

In the thermoplastic resin constituting the present invention, an antioxidant, a light stabilizer, an ultraviolet absorber, a neutralizing agent, a nucleating agent, and an epoxy stabilizer may be appropriately added as needed within a range that does not impair the effects of the present invention. Additives such as lubricants, antibacterial agents, flame retardants, antistatic agents, pigments and plasticizers.

In the fiber of the present invention, in order not to impair the effects of the present invention, in order to impart a drape feeling or a smooth touch feeling obtained by its own weight, and Fibers having excellent flexibility by forming voids inside and outside the fibers such as pores or cracks can be obtained, and inorganic fine particles can be added as needed. The amount of such inorganic fine particles is preferably in the range of 0% by mass to 10% by mass, more preferably 1% by mass to 5% by mass in the fiber.

The inorganic fine particles are not particularly limited as long as they have a high specific gravity and are less likely to cause aggregation in the molten thermoplastic resin, and examples thereof include titanium oxide (specific gravity: 3.7 to 4.3) and zinc oxide (specific gravity: 5.2). 5.7), barium titanate (specific gravity 5.5~5.6), barium carbonate (specific gravity 4.3~4.4), barium sulfate (specific gravity 4.2~4.6), zirconia (specific gravity 5.5), zirconium silicate (specific gravity 4.7) Alumina (specific gravity: 3.7 to 3.9), magnesium oxide (specific gravity: 3.2), or a substance having a specific gravity substantially equal to those of the above materials, and titanium oxide can be preferably used.

The method of adding the inorganic fine particles to the fiber may be a method of directly adding the powder of the inorganic fine particles to the thermoplastic resin during spinning, or by forming the powder of the inorganic fine particles as a master batch, and the mother when spinning. A method of mixing a material with a thermoplastic resin, and the like. The thermoplastic resin used for the master batch is preferably the same thermoplastic resin as the thermoplastic resin constituting the fiber. However, it is not particularly limited as long as the requirements of the present invention are satisfied, and different thermoplastic resins may be used.

The fiber of the present invention can be suitably obtained, for example, by spinning the above thermoplastic resin by a melt spinning method to obtain an unstretched fiber, performing local alignment crystallization in the stretching step, and then in a crimping step. The crimping is given to the middle, and then heat treatment is performed for a predetermined time at a predetermined temperature using a hot air dryer or the like.

The fineness of the fiber of the present invention is not particularly limited, but is preferably 0.3 dtex to 12.0 dtex, and more preferably 1.0 dtex to 8.0 dtex, and more preferably 1.7 dtex to 6.0 in terms of a process of processing the fiber into a nonwoven fabric. Dtex.

The fiber length of the fiber of the present invention is not particularly limited, and can be arbitrarily determined according to each method of forming the fiber into, for example, a nonwoven fabric. For example, when a fiber web-like short fiber is formed using a roller carding machine, the fiber length of the fiber is preferably from 25 mm to 125 mm, more preferably from 38 mm to 76 mm. Further, in the case where a fiber-like chop is formed using an air-laid machine, the fiber length is preferably from 3 mm to 25 mm, more preferably from 3 mm to 12 mm.

The method of processing the fibers into a nonwoven fabric is not particularly limited, and it is preferred to use a method in which a fiber web is formed and then heat-treated, and the entangled dots of the fibers constituting the fiber web are thermally heated to form a nonwoven fabric. Examples of the method for forming the fiber web include a carding method in which the short fibers are passed through a roller carding machine, an air-laid method in which short fibers are formed into a net by air, and a spinning-bonding method in which long fibers are laminated. The method of heat-treating the fiber web to heat it may use a hot air circulation type dryer, a hot air vent type heat treatment machine, a relaxation type hot air dryer, a hot plate pressure type dryer, a drum type dryer, and infrared rays. A well-known person such as a dryer or a local thermocompression bonding machine.

The basis weight (mass per unit area) of the nonwoven fabric in the case where the fiber of the present invention is processed into a nonwoven fabric is not particularly limited, and can be determined depending on the use to be used. For example, in the case of a disposable diaper or a sanitary napkin, the surface material is preferably 10 g/m ² to 50 g/m ² , more preferably 20 g/m ² to 35 g/m ² .

The fiber formed body of the present invention comprises, in addition to the non-woven fabric as described above, The following items are included: a fiber bundle, a fiber web, a fiber laminate, a mesh, a woven fabric, and a heat treatment for processing the articles into a sheet or a block, and the non-woven fabric is superposed in a layered or wavy manner and subjected to heat treatment. Sub-processed and so on. The fiber molded body of the present invention is particularly preferably a nonwoven fabric.

The fiber or fiber molded body of the present invention can be used, and various fiber products can be produced according to the type of product according to a usual method.

Examples of the fiber product using the fiber or fiber molded body of the present invention include absorbent articles such as diapers, sanitary napkins, and incontinence pads; medical gowns such as medical gowns and surgical gowns; wall sheets and window papers. Interior materials such as floor slabs; cover cloth, wiper for cleaning, kitchen garbage cover, etc.; disposable toilets, toilet covers, etc.; pet sheets, pets Pet products such as diapers and pet towels; industrial materials such as wiping materials, filters, cushioning materials, oil adsorbing materials, and ink cartridges for ink cartridges; common medical materials; bedroom materials; and care products. The fibers or fiber shaped bodies of the present invention are useful in a variety of fiber products.

The fibrous product of the present invention is particularly exemplified by an absorbent article.

[Example]

Hereinafter, the present invention will be described in detail by way of examples, but the invention is not limited by the examples. In addition, the manufacturing, processing, measurement, and test in each example were performed by the method shown below.

<Example 1 to Example 8 and Comparative Example 1 to Comparative Example 7>

(thermoplastic resin)

The following resins were used as the thermoplastic resin constituting the fibers.

Resin 1: high density polyethylene (referred to as PE) having a density of 0.96 g/cm ³ , a melt flow rate (MFR) (190 ° C, a load of 21.18 N) of 16 g/10 min, and a melting point of 130 ° C.

Resin 2: MFR (230 ° C, load: 21.18 N) of 11 g/10 min, melting point of 162 ° C polypropylene (referred to as PP-1)

Resin 3: MFR (230 ° C, load 21.18 N) of 16 g/10 min, melting point of 162 ° C polypropylene (referred to as PP-2)

Resin 4: an ethylene-propylene-butene-1 copolymer having an MFR (230 ° C, a load of 21.18 N) of 16 g/10 min, a melting point of 131 ° C, an ethylene content of 4.0% by weight, and a 1-butene content of 2.65 % by weight. (referred to as co-PP)

(Measurement of melt mass flow rate (MFR))

The measurement of the melt mass flow rate was carried out in accordance with JIS K 7210. Here, MI is measured in accordance with Condition D (test temperature: 190 ° C, load: 2.16 kg) of Table 1 of Attachment A, and MFR is measured according to Condition M (test temperature: 230 ° C, load: 2.16 kg).

(manufacture of fibers)

The thermoplastic resin shown in Tables 1 to 2 was melt-spun at a predetermined extrusion temperature using a spinning nozzle which formed a concentric sheath core profile to obtain a concentric sheath core type having a fiber profile of 50/50 by volume. Unstretched fiber. At this time, the fiber treatment agent shown in Tables 1 to 2 was attached to the unstretched fiber by an oil roll. The obtained unstretched fiber was stretched by a hot roll at 90 ° C, and crimped by a crimper, thereby forming a stretched fiber. Thereafter, the stretched fiber was dried by a hot air circulation type dryer, and cut into a short fiber of 2.2 dtex by a cutter at 51 mm, and used as a sample fiber.

(composition of fiber treatment agent)

The composition of the fiber treating agent used in each example is shown in Tables 1 to 2. The unit of the composition is % by mass, and the total amount of the active ingredients in the fiber treatment agent is set to 100% by mass.

(Measurement of the amount of adhesion of the fiber treatment agent)

The sample fiber was made into a fiber web by a roller carding tester (manufactured by Yamato Machinko Co., Ltd.), and 2 g was taken out from the fiber web and subjected to a rapid residual fat extraction device (manufactured by Tokai Keiki Co., Ltd., "R-II type"). Determination. 25 ml of methanol was used as an extraction solvent.

The amount of adhesion was calculated using the following formula.

The amount of the treatment agent (% by mass) = the amount of extraction (g) ÷ 2 × 100

(color resistance test)

The sample fibers obtained in the above steps were formed into carded webs by a roller carding tester (manufactured by Yamato Seiki Co., Ltd.), and the web was made to have a basis weight of about 200 g/m by a needle punch press machine. ² ± 20 g / m ² non-woven fabric. The sample was cut into a length of 8 cm × a width of 8 cm, and was placed at an upper portion of a petroleum furnace fire source of 80 cm (ambient temperature was 100 ° C ± 5 ° C). After exposure to the combustion gas for 3 hours, the sample was taken out. The value of the yellowness index (YI) of the surface of the test sample before and after the test was measured by a color difference meter (manufactured by Suga Test Instruments Co., Ltd., "Model SM-4"), and the difference ΔYI was calculated as follows. Three levels were evaluated.

Good A>B>C difference

When ΔYI is less than 6, it is considered to be excellent in discoloration resistance, and it is evaluated as 'A'.

When ΔYI is 6 or more and less than 8, it is evaluated as 'B'.

When ΔYI is 8 or more, the discoloration property is high, so the evaluation is "C".

(not woven)

The sample fibers obtained in the above steps were formed into a carded web by a roller carding tester (manufactured by Yamato Machinery Co., Ltd.), and subjected to aeration processing at temperatures as described in Tables 1 to 2 by a vacuum suction dryer. (TA for short) The web was subsequently heated to obtain a nonwoven fabric having a basis weight of about 23 g/m ² ± 2 g/m ² .

(absorption evaluation)

The non-woven fabric obtained in the above step was cut in a length of 10 cm × 10 cm in width, and placed on an absorbent body covered with a tissue, and 1 drop of artificial urine was added to each of 10 places using a 2 ml pipette, and absorbed according to the surface of the non-woven fabric. The absorption rate is calculated by the following formula.

Absorption rate (%) = (number of absorbed (units)/10) × 100

Thereafter, the non-woven fabric was washed with 50 ml of artificial urine, and after sufficiently dried, it was dropped at the position where it was previously dropped, and the absorption rate was measured again. The above operation was repeated until the absorption rate reached 0%, and the durability hydrophilicity was evaluated by the following three levels.

Good A>B>C difference

When the third absorption rate exceeds 0%, it is considered to be excellent in absorbability. Is ‘A’.

When the second absorption rate exceeded 0% and the third absorption rate was 0%, the evaluation was "B".

When the second absorption rate was 0%, it was considered that the absorbability was poor, and it was evaluated as "C".

Further, the artificial urine used in the evaluation was prepared using the following composition ratio.

Urea............2.00% by mass

Sodium chloride..........0.80% by mass

Magnesium sulfate..........0.08 mass%

Calcium chloride ..........0.03 mass%

Ion exchange water...97.09 mass%

In Tables 1 and 2 below, the composition and processing conditions of the fibers and the results of tests and measurements according to the above test and measurement methods are shown together.

[Industrial availability]

The fiber of the present invention has not only high durability and hydrophilicity but also excellent discoloration resistance by adhering the fiber treating agent, and the fiber treating agent contains a specific sulfate salt or sulfosuccinic acid in a predetermined amount or more. Diester salts and phosphate salts.

Further, the fibrous formed body such as a nonwoven fabric obtained from the fiber of the present invention has high durability and hydrophilicity, and is excellent in discoloration resistance, and can be advantageously used for various fibrous products such as diapers, sanitary napkins, incontinence pads and the like. Medical robes, surgical gowns and other medical and sanitary materials; interior materials for wall sheets, window papers, flooring, etc.; fabrics for cleaning, rags for cleaning, kitchen garbage covers, etc.; disposable toilets, toilets Washing products with lids; pet sheets, pet diapers, pet towels, etc.; industrial materials such as wiping materials, filters, cushioning materials, oil adsorbing materials, ink cartridges, etc.; general medical materials; bedroom materials; Care products, etc.

Claims (5)

A fiber containing at least one thermoplastic resin and having a fiber treating agent containing 25% by mass or more of the component (A) and 5% by mass or more of the component (B) and 5, based on the active ingredient. The component (C) having a mass % or more and 0.1% by mass to 1.0% by mass of the fiber treating agent adhered to the fiber mass, the component (A): a sulfate having a hydrocarbon group having 8 to 22 carbon atoms Salt; the component (B): a sulfosuccinic acid diester salt having a hydrocarbon group having 12 to 20 carbon atoms; and the component (C): a phosphate salt having a hydrocarbon group having 4 to 18 carbon atoms. The fiber according to claim 1, wherein the composition ratio (% by mass) of the component (A) and the composition ratio (% by mass) of the component (C) based on the active ingredient in the fiber treating agent are satisfied. The composition ratio of the component (A) and the component ratio of the component (C). A fiber formed body comprising a fiber as described in claim 1 or 2 as a main body. The fiber formed body according to claim 3, which is a non-woven fabric. An absorbent article obtained by using the fiber formed body according to claim 3 or 4.