JP2020143411A - Non-woven fabric, laminate, covered sheet, and method for producing non-woven fabric - Google Patents

Abstract

To provide a non-woven fabric, that has an excellent hydrophilicity and a suppressed transfer of hydrophilizing agent when in contact with other members.SOLUTION: A non-woven fabric, containing a fiber of a thermoplastic polymer, a penetrant containing at least one of a sulfonate and a sulfate ester salt, and a wetting agent, and in which the ratio of the surface water vapor adsorption area in the water vapor adsorption test obtained from BET formula for water vapor adsorption isotherm to the surface nitrogen adsorption area in the nitrogen adsorption test obtained from BET formula for nitrogen adsorption isotherm (surface water vapor adsorption area/surface nitrogen adsorption area) is 2.0 to 5.8.SELECTED DRAWING: None

Description

The present disclosure relates to non-woven fabrics, laminates, coated sheets, and methods for producing non-woven fabrics.

In recent years, non-woven fabrics have been widely used in various applications because of their excellent breathability and flexibility. Therefore, the non-woven fabric is required to have various properties according to its use, and to improve the properties.

For example, a non-woven fabric (such as a top sheet of an absorbent article) used for a member that comes into direct contact with the skin is required to have excellent hydrophilicity. As one of the methods for imparting hydrophilicity to a non-woven fabric, a method for producing a non-woven fabric using a water-permeable fiber to which a specific water-permeable imparting agent is attached to a hydrophobic synthetic fiber for producing a non-woven fabric has been proposed. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-102424

By the way, as a method of imparting hydrophilicity to a non-woven fabric, a kneading method and a coating method are known. In the kneading method, a non-woven fabric is formed by forming a non-woven fabric with fibers of a thermoplastic polymer in which a drug for imparting hydrophilicity (hereinafter, the drug for imparting hydrophilicity is referred to as a hydrophilic agent) is kneaded. It is a method of imparting hydrophilicity to a non-woven fabric. The coating method is a method of imparting hydrophilicity to the non-woven fabric by adhering a hydrophilic agent to the fiber surface.

When the non-woven fabric to which the hydrophilic agent is applied is applied to, for example, the top sheet of a diaper, the hydrophilic agent may be transferred to a member (gather or the like) in contact with the top sheet of the diaper. For example, if the gathers are hydrophilized due to the transfer of the hydrophilizing agent to the gathers, liquid leakage may occur in the diaper.

Further, when the non-woven fabric to which the hydrophilic agent is applied is applied to an application involving post-processing (for example, stretching processing, drilling processing) such as a diaper, the hydrophilic agent may be transferred to the processing machine. If the hydrophilic agent continues to move to the processing machine for a long period of time, it is considered that corrosion due to the transfer of the hydrophilic agent occurs.

As described above, the non-woven fabric to which hydrophilicity is imparted is required to have excellent hydrophilicity, and there is room for further improvement from the viewpoint of suppressing the transfer of the hydrophilic agent to the member in contact with the non-woven fabric.

An object of the present disclosure is to provide a non-woven fabric having excellent hydrophilicity and suppressing the migration of a hydrophilic agent when it comes into contact with another member. An object of the present disclosure is to provide a laminate having a non-woven fabric which is excellent in hydrophilicity and in which migration of a hydrophilic agent is suppressed when it comes into contact with another member. An object of the present disclosure is to provide a method for producing a non-woven fabric which is excellent in hydrophilicity and in which migration of a hydrophilic agent is suppressed when it comes into contact with another member.

The present disclosure relates to the following aspects.

<1>
Thermoplastic polymer fibers and
With a penetrant containing at least one of a sulfonate and a sulfate ester
Wetting agent and
The ratio of the surface water vapor adsorption area in the water vapor adsorption test obtained by the water vapor adsorption isotherm BET formula to the surface nitrogen adsorption area in the nitrogen adsorption test obtained by the BET formula of the nitrogen adsorption isotherm (surface water vapor adsorption area / surface). A non-woven fabric having a nitrogen adsorption area) of 2.0 to 5.8.
<2>
In water vapor adsorption tests obtained by BET equation vapor adsorption isotherm, surface water vapor adsorption area ^is 0.4m ² /g~1.2m 2 / g, according to <1> nonwoven.
<3>
The nonwoven fabric according to <1> or <2>, wherein the sulfonate is an alkyl sulfosuccinate.
<4>
The non-woven fabric according to any one of <1> to <3>, wherein the ratio of the penetrant to the wetting agent (penetrating agent / wetting agent) is 1/99 to 60/40 in terms of mass ratio.
<5>
<1>, wherein the fiber has a propylene-based polymer composition containing 100 parts by mass of a propylene-based polymer (A) having a melting point of 130 ° C. or higher and 1 part by mass to 10 parts by mass of an ethylene-based polymer (B). The non-woven fabric according to any one of ~ <4>.
<6>
The non-woven fabric according to <5>, wherein the ethylene polymer (B) has a density of 0.930 g / cm ^{3 to} 0.980 g / cm ³ .
<7>
The non-woven fabric according to <5> or <6>, wherein the propylene-based polymer composition further contains an ethylene-based polymer wax (C) having a weight average molecular weight (Mw) of 400 to 30,000.
<8>
The density of the ethylene polymer wax (C) ^is a ^{0.890g / cm 3 ~0.980g / cm 3} , the nonwoven fabric according to <7>.
<9>
The above-mentioned one of <5> to <8>, wherein the propylene-based polymer composition contains the propylene-based polymer (D) shown in the following (III) in an amount of more than 0 parts by mass and 25 parts by mass or less. Non-woven fabric.
(III) Propylene homopolymer having a melting point of less than 120 ° C. satisfying the following (a) to (f) (a) [mmmm] = 20 mol% to 60 mol%
(B) [rrrr] / (1- [mmmm]) ≦ 0.1
(C) [rmrm]> 2.5 mol%
(D) [mm] × [rr] / [mr] 2 ≦ 2.0
(E) Weight average molecular weight (Mw) = 10,000 to 200,000
(F) Molecular weight distribution (Mw / Mn) <4
In (a) to (d), [mmmm] is a racemic pentad fraction, [rrrr] is a racemic pentad fraction, and [rmrm] is a racemic mesolacemic mesopentad fraction, [m.
m], [rr] and [mr] are triad fractions, respectively.
<10>
The non-woven fabric according to any one of <1> to <9>, which has an average fiber diameter of 5 μm to 25 μm.
<11>
For the penetrant and the wetting agent, 0.02 g of the penetrant and the wetting agent were added to 20 ml of a 1/1 mixed solution of hexane / water in a mass ratio, and the penetrant and the wetting agent were added. The non-woven fabric according to any one of <1> to <10>, wherein the added mixed solution is stirred and the oil phase and the aqueous phase are separated after 1 minute.
<12>
Any one of <1> to <11>, wherein the wetting agent contains at least one selected from the group consisting of polyhydric alcohol fatty acid ester, polyoxyalkylene fatty acid ester, and alkylene oxide adduct of polyhydric alcohol fatty acid ester. The non-woven fabric described in 1.
<13>
The non-woven fabric according to any one of <1> to <12>, which is a spunbonded non-woven fabric.
<14>
A covering sheet containing the non-woven fabric according to any one of <1> to <13>.
<15>
A laminate comprising the non-woven fabric according to any one of <1> to <13>.
<16>
A covering sheet containing the laminate according to <15>.
<17>
The process of preparing the non-woven fabric containing the fibers of the thermoplastic polymer,
A step of attaching a penetrant containing at least one of a sulfonate and a sulfate ester salt and a wetting agent to the non-woven fabric.
Have,
Ratio of surface water vapor adsorption area in the water vapor adsorption test obtained by the water vapor adsorption isotherm BET formula to the surface nitrogen adsorption area in the nitrogen adsorption test obtained by the BET formula of the nitrogen adsorption isotherm (surface water vapor adsorption area / surface nitrogen adsorption area) However, the method for producing a non-woven fabric is 2.0 to 5.8.

According to the present disclosure, there is provided a non-woven fabric having excellent hydrophilicity and in which migration of a hydrophilic agent is suppressed when it comes into contact with another member. According to the present disclosure, there is provided a laminate provided with a non-woven fabric having excellent hydrophilicity and suppressing the migration of a hydrophilic agent when in contact with another member. According to the present disclosure, there is provided a method for producing a non-woven fabric which is excellent in hydrophilicity and in which migration of a hydrophilic agent is suppressed when it comes into contact with another member.

Hereinafter, the present disclosure will be described in detail with reference to an example of a preferred embodiment. These descriptions and examples exemplify the embodiments and do not limit the scope of the embodiments.

The numerical range indicated by using "~" in the present disclosure indicates a range including the numerical values before and after "~" as the minimum value and the maximum value, respectively.
In the present disclosure, the term "process" is included in this term not only as an independent process but also as long as the purpose of the process is achieved even if it cannot be clearly distinguished from other processes.
In the present disclosure, the content of each component in the composition is the total amount of the plurality of substances present in the composition unless otherwise specified, when a plurality of substances corresponding to each component are present in the composition. Means.
In the present disclosure, the MD (Machine Direction) direction refers to the traveling direction of the non-woven web in the nonwoven fabric manufacturing apparatus. The CD (Cross Direction) direction refers to a direction perpendicular to the MD direction and parallel to the main surface (a surface orthogonal to the thickness direction of the non-woven fabric).
In the present disclosure, the term "included as a subject" means that the substance of interest is contained in the largest amount as a whole. For example, as a ratio to the whole, it shows that the content ratio of the target substance is 50% by mass or more.

<Non-woven fabric>
An example of a preferred embodiment of the nonwoven fabric of the present disclosure will be described.
The non-woven fabric of the present disclosure contains fibers of a thermoplastic polymer, a penetrant containing at least one of a sulfonate and a sulfate ester salt, and a wetting agent.
The non-woven fabric of the present disclosure is the ratio of the surface water vapor adsorption area in the water vapor adsorption test obtained by the water vapor adsorption isotherm BET formula to the surface nitrogen adsorption area in the nitrogen adsorption test obtained by the BET formula of the nitrogen adsorption isotherm (surface water vapor). Adsorption area / surface nitrogen adsorption area) is 2.0 to 5.8.

In the present disclosure, the penetrant and the wetting agent function as agents for imparting hydrophilicity. In the following description, in the present disclosure, the penetrant and the wetting agent are collectively referred to as a hydrophilic agent.

The non-woven fabric of the present disclosure is excellent in hydrophilicity by containing the fibers of the thermoplastic polymer and the above-mentioned hydrophilic agent, and the migration of the hydrophilic agent when it comes into contact with other members is suppressed. Although it is not clear why the non-woven fabric of the present disclosure has excellent hydrophilicity and suppresses the transfer of the hydrophilicizing agent when it comes into contact with other members, the present inventors speculate as follows. Among the hydrophilic agents contained in the non-woven fabric of the present disclosure, the wetting agent is considered to have an action of imparting hydrophilicity to the non-woven fabric. Further, among the hydrophilic agents, the above-mentioned specific penetrant is considered to be excellent in the action of permeating the wetting agent into the fibers constituting the non-woven fabric. The non-woven fabric of the present disclosure has the above-mentioned surface water vapor adsorption area / surface nitrogen adsorption area of 2.0 to 5.8. If this area ratio is too large, the hydrophilicity is excellent, but the hydrophilicizing agent easily migrates when it comes into contact with other members. On the other hand, if this area ratio is too small, the transfer of the hydrophilic agent is suppressed when it comes into contact with other members, but the hydrophilicity is low. Among the hydrophilic agents, those having high hydrophilicity can obtain high hydrophilicity with a small amount of application, but migration to other members is likely to occur. This area ratio also tends to be high. Those with low hydrophilicity are difficult to obtain sufficiently high hydrophilicity with a small amount of coating, but migration to other members is unlikely to occur, and this area ratio tends to be low. Therefore, when this area ratio is within the above range, the balance between the hydrophilicity of the fibers constituting the non-woven fabric and the amount of the hydrophilic agent contained in the non-woven fabric is excellent. As a result, it is considered that the non-woven fabric of the present disclosure is excellent in hydrophilicity and the migration of the hydrophilic agent is suppressed even when it comes into contact with other members.

The non-woven fabric of the present disclosure is not particularly limited in the method of incorporating the hydrophilic agent, and may be a non-woven fabric obtained by either a kneading method or a coating method. The non-woven fabric of the present disclosure has a higher effect of suppressing the migration of the hydrophilic agent to other members in the non-woven fabric obtained by the coating method than the non-woven fabric obtained by the kneading method.

(Hydrophilic agent)
The non-woven fabrics of the present disclosure include penetrants and wetting agents (ie, hydrophilizing agents). The penetrant comprises at least one of a sulfonate and a sulfate ester salt.

[Penetrating agent]
Examples of the sulfonate include alkylbenzene sulfonate, alkylnaphthalene sulfonate, α-olefin sulfonate, and alkylsulfosuccinate. These sulfonates are preferably alkali metal salts of sulfonic acid. Examples of the sulfate ester salt include higher alcohol sulfate ester salts and alkyl sulfate ester salts. As these sulfates, alkali metal salts of sulfates are preferable. Among these, the penetrant preferably contains a sulfonate, and more preferably contains an alkali metal salt of a sulfonic acid.

The sulfonate as the penetrant is preferably an alkylsulfosuccinate from the viewpoint of suppressing the migration of the hydrophilic agent when it comes into contact with other members. The alkyl sulfosuccinate is more preferably an alkali metal salt of dialkyl sulfosuccinic acid, more preferably a sodium dialkyl sulfosuccinate (Na) salt, and a dialkyl having two alkyl groups having 8 to 16 carbon atoms. Alkali metal salts of sulfosuccinic acid are more preferred. Specific examples of the alkali metal salt of dialkyl sulfosuccinic acid having two alkyl groups having 8 to 16 carbon atoms include dioctyl sulfosuccinate sodium salt, di (2-ethylhexyl) sulfosuccinate sodium salt, and didecyl. Examples thereof include sodium sulfosuccinate salt, didodecyl sulfosuccinate sodium salt, ditetradecyl sulfosuccinate lithium (Li) salt, dihexadecyl sulfosuccinate potassium (K) salt and the like. Among these, a sodium salt of di (2-ethylhexyl) sulfosuccinate is preferable from the viewpoint of suppressing the migration of the hydrophilizing agent when it comes into contact with other members.

[Wetting agent]
The wetting agent is not particularly limited, and may be a cationic surfactant, an anionic surfactant, an amphoteric surfactant, or a nonionic surfactant.

Examples of the cationic surfactant include alkyl (or alkenyl) trimethylammonium halide, quaternary ammonium salt represented by dialkyl (or alkenyl) dimethylammonium halide, alkylamine salt, and alkylene oxide adducts thereof. .. Examples of the anionic surfactant include a phosphate ester salt typified by sodium lauryl phosphate and a fatty acid salt typified by sodium laurate. Examples of the amphoteric surfactant include salts of these cationic surfactants and anionic surfactants.

The wetting agent is preferably a nonionic surfactant from the viewpoint of imparting excellent hydrophilicity. Examples of the nonionic surfactant which is a wetting agent include polyhydric alcohol fatty acid ester, polyoxyalkylene fatty acid ester, alkylpolyoxyethylene alcohol, alkylene oxide adduct of polyhydric alcohol fatty acid ester, alkoxylated alkylphenol, fatty acid amide, and the like. Examples thereof include nonionic surfactants such as alkyldiethanolamide and polyoxyalkylene. Among these, from the viewpoint of imparting excellent hydrophilicity, it is preferable to include at least one selected from the group consisting of polyhydric alcohol fatty acid esters, polyoxyalkylene fatty acid esters, and alkylene oxide adducts of glycerin fatty acid esters. The polyhydric alcohol fatty acid ester, the polyoxyalkylene fatty acid ester, and the alkylene oxide adduct of the polyhydric alcohol fatty acid ester may be any of monoester, diester, and triester, respectively. The polyhydric alcohol fatty acid ester, the polyoxyalkylene fatty acid ester, and the alkylene oxide adduct of the polyhydric alcohol fatty acid ester may contain one of a monoester, a diester, and a triester, respectively. It may contain more than a seed.

Examples of the polyhydric alcohol fatty acid ester include glycerin fatty acid ester and sorbitan fatty acid ester. As for both the glycerin fatty acid ester and the sorbitan fatty acid ester, an ester of glycerin or sorbitan and a fatty acid having 10 to 20 carbon atoms is preferable. Specific examples thereof include glycerin lauric acid monoester, glycerin oleic acid diester, glycerin oleic acid triester, sorbitan lauric acid monoester, sorbitan lauric acid diester, and sorbitan lauric acid triester.

Examples of the polyoxyalkylene fatty acid ester include polyoxyethylene fatty acid ester and polyoxypropylene fatty acid ester. Among these, polyoxyethylene fatty acid ester is preferable. The polyoxyethylene fatty acid ester preferably has 10 to 20 carbon atoms and 5 to 20 additional moles of ethylene oxide chains (also referred to as EO chains). Specific examples thereof include polyoxyethylene stearic acid monoester, polyoxyethylene lauric acid monoester, polyoxyethylene lauric acid diester, polyoxyethylene oleic acid monoester, and polyoxyethylene oleic acid diester.

Examples of the alkylene oxide adduct of the polyhydric alcohol fatty acid ester include an ethylene oxide adduct of the polyhydric alcohol fatty acid ester and a propylene oxide adduct of the polyhydric alcohol fatty acid ester. Among these, the alkylene oxide adduct of the polyhydric alcohol fatty acid ester is an ester of glycerin and a fatty acid having 10 to 20 carbon atoms, and the number of moles of ethylene oxide added is preferably 5 to 20. Specifically, polyoxyethylene glycerin lauric acid monoester, polyoxyethylene glycerin lauric acid diester, polyoxyethylene glycerin lauric acid triester, polyoxyethylene sorbitan oleic acid monoester, polyoxyethylene sorbitan oleic acid diester, polyoxy Examples thereof include ethylene sorbitan oleic acid triester.

The wetting agent is preferably contained in combination with a polyhydric alcohol fatty acid ester, an alkylene oxide adduct of the polyhydric alcohol fatty acid ester, and a polyoxyalkylene fatty acid ester from the viewpoint of imparting excellent hydrophilicity. The wetting agent is also preferably contained in combination with a polyhydric alcohol fatty acid ester and a polyoxyalkylene fatty acid ester.

The combination of the polyhydric alcohol fatty acid ester, the alkylene oxide adduct of the polyhydric alcohol fatty acid ester, and the polyoxyalkylene fatty acid ester includes glycerin fatty acid ester, the ethylene oxide adduct of the polyhydric alcohol fatty acid ester, and the polyoxyethylene fatty acid. More preferably, it is a combination with an ester. A combination of a glycerin oleic acid diester, a polyoxyethylene glycerin lauric acid diester and a triester, and a polyoxyethylene lauric acid diester is more preferable.

The combination of the polyhydric alcohol fatty acid ester and the alkylene oxide adduct of the polyhydric alcohol fatty acid ester is more preferably a combination of the glycerin fatty acid ester and the alkylene oxide adduct of the polyhydric alcohol fatty acid ester. A combination of the glycerin oleic acid diester and the glycerin oleic acid triester and the polyoxyethylene oleic acid monoester and the polyoxyethylene oleic acid diester is more preferable.
The combination of the polyhydric alcohol fatty acid ester and the polyoxyalkylene fatty acid ester is preferably a combination of a sorbitan lauric acid monoester, a diester and a triester, and a polyoxyethylene lauric acid monoester and a diester. Further, in addition to these sorbitan lauric acid esters and polyoxyethylene lauric acid esters, it is also preferable to combine polyoxyethylene sorbitan oleic acid monoesters, polyoxyethylene sorbitan oleic acid diesters and polyoxyethylene sorbitan oleic acid triesters. ..

The ratio of the penetrant to the wetting agent (penetrating agent / wetting agent) is preferably 1/99 to 60/40 in terms of mass ratio. This ratio is more preferably 5/95 to 50/50 and even more preferably 10/90 to 40/60. When the mass ratio of the wetting agent / penetrant is in this range, the hydrophilicity is excellent, and the transfer of the hydrophilicizing agent when it comes into contact with other members is likely to be suppressed.

As the hydrophilizing agent, 0.02 g of the above hydrophilizing agent (that is, a combination of the penetrant and the wetting agent) was added to 20 ml of a 1/1 (mass ratio) mixed solution of hexane / water to make it hydrophilized. When the mixed solution after the agent is added is stirred, it is preferable to separate it into an oil phase and an aqueous phase after 1 minute (hereinafter, also referred to as a hydrophilic agent separation test). This separation test is considered to be an index of the affinity of water or the thermoplastic polymer for fibers as a whole of the hydrophilic agent. When the hydrophilic agent separates into the oil phase and the aqueous phase, it is considered to have a higher affinity for water, and when it does not separate, it is considered that the affinity for the fiber of the thermoplastic polymer is higher. Therefore, the hydrophilicity tends to be further improved by using the hydrophilic agent that separates by the above separation test. The hydrophilizing agent exhibiting such properties preferably has a penetrant / wetting agent mass ratio in the range of 1/99 to 60/40, and more preferably in the range of 10/90 to 40/60. ..

For example, in the separation test of the hydrophilizing agent, when analyzing from the non-woven fabric to be measured, for example, it may be measured as follows. First, a non-woven fabric of 100 g or more is prepared. Next, the prepared non-woven fabric is immersed in ethanol and allowed to stand at 25 ° C. for 24 hours to obtain an extract A. The non-woven fabric is immersed in another ethanol and allowed to stand at 25 ° C. for 24 hours to obtain an extract B. The extract A and the extract B are degassed and heated to 80 ° C. to sufficiently remove ethanol to obtain a residue. The residue is then mixed and subjected to a separation test of the hydrophilizing agent.

The amount of the hydrophilizing agent applied is preferably 0.1% by mass to 2.0% by mass. The amount of the hydrophilizing agent applied is more preferably 0.2% by mass to 1.5% by mass, and even more preferably 0.3% by mass to 1.2% by mass. When the amount of the hydrophilic agent applied is in this range, the hydrophilicity is excellent, and the transfer of the hydrophilic agent when it comes into contact with other members is likely to be suppressed. The amount of the hydrophilic agent applied is obtained by subtracting the mass of the non-woven fabric before applying the hydrophilic agent from the mass of the non-woven fabric after applying the hydrophilic agent, and subtracting the mass of the non-woven fabric after applying the hydrophilic agent. It is expressed as a percentage divided by.

(Thermoplastic polymer fiber)
The fiber of the thermoplastic polymer is not particularly limited as long as it is a fiber that can form a non-woven fabric. Specific examples of the thermoplastic polymer constituting the fiber include an olefin polymer, a polyester polymer, a polyamide polymer, and a polymer composition containing these polymers. The olefin-based polymer is a polymer mainly composed of a structural unit derived from an olefin. The polyester-based polymer is a polymer containing polyester as a structural unit. The polyamide-based polymer is a polymer containing polyamide as a structural unit. In the present disclosure, the thermoplastic polymer is a concept including a thermoplastic polymer composition.

Among these, the thermoplastic polymer is preferably an olefin-based polymer composition, and more preferably a propylene-based polymer composition. The olefin-based polymer composition refers to a polymer composition containing an olefin-based polymer as a main component. The propylene-based polymer composition refers to a polymer composition containing a propylene-based polymer as a main component. The propylene-based polymer and the polymer composition containing the propylene-based polymer as a main component will be described below.

[Propylene-based polymer composition]
The propylene-based polymer composition is not particularly limited as long as it is a polymer composition containing the propylene-based polymer as a main component. For example, the propylene-based polymer composition may be a propylene-based polymer composition containing two or more different propylene-based polymers, or a propylene-based polymer composition containing a propylene-based polymer and an ethylene-based polymer. It may be. The propylene-based polymer refers to a polymer mainly composed of a structural unit derived from propylene, and is a concept including a propylene homopolymer and a copolymer of propylene and α-olefin other than propylene. Further, the ethylene-based polymer means a polymer mainly composed of a structural unit derived from ethylene, and is a concept including an ethylene homopolymer and a copolymer of ethylene and an α-olefin other than ethylene.

From the viewpoint of the strength and extensibility of the non-woven fabric, the propylene-based polymer composition is a propylene-based polymer composition containing a propylene-based polymer (A) having a melting point of 130 ° C. or higher and an ethylene-based polymer (B). Is preferable. From the same viewpoint, the propylene-based polymer composition containing 100 parts by mass of the propylene-based polymer (A) having a melting point of 130 ° C. or higher and 1 part by mass to 10 parts by mass of the ethylene-based polymer (B) is more likely to be used. preferable. A propylene-based polymer composition containing 100 parts by mass of the propylene-based polymer (A) having a melting point of 130 ° C. or higher and 2 parts by mass to 8 parts by mass of the ethylene-based polymer (B) is more preferable. If necessary, components such as the ethylene-based polymer wax (C) described later and the propylene-based polymer (D) shown in (III) may be contained.

-Propylene polymer (A)-
The propylene-based polymer (A) is not particularly limited as long as it has a melting point of 130 ° C. or higher, and may be either a propylene homopolymer or a copolymer of propylene and an α-olefin other than propylene. From the viewpoint of the strength and extensibility of the non-woven fabric, the melting point of the propylene-based polymer (A) is preferably 130 ° C. or higher, more preferably 140 ° C. or higher, and even more preferably 150 ° C. or higher. The melting point of the propylene-based polymer (A) is preferably 170 ° C. or lower.

From the viewpoint of the strength and extensibility of the non-woven fabric, the content of the propylene-based polymer (A) is preferably 50% by mass or more, and 70.0% by mass or more 99. With respect to the total mass of the fibers of the thermoplastic polymer. It is more preferably 0% by mass or less, and further preferably 85.0% by mass or more and 97.0% by mass or less.

As the propylene-based polymer (A), a commercially available product may be used as it is, or may be synthesized by various known methods.

The melt flow rate (MFR: ASTM D1238, 230 ° C., load 2160 g) of the propylene-based polymer (A) is not particularly limited as long as it can be melt-spun. For example, the MFR may be 1 g / 10 minutes to 1000 g / 10 minutes, preferably 5 g / 10 minutes to 500 g / 10 minutes, and more preferably 10 g / 10 minutes to 100 g / 10 minutes. ..

The propylene-based polymer (A) may be used alone in the propylene-based polymer composition, or two or more kinds having different melting points, molecular weights, crystal structures, etc. may be used.

-Ethylene polymer (B)-
The ethylene-based polymer (B) is not particularly limited as long as it is a polymer mainly composed of a structural unit derived from ethylene, and may be either an ethylene homopolymer or a copolymer of ethylene and an α-olefin other than ethylene. Good. Specific examples of the ethylene polymer (B) include high-pressure low-density polyethylene (so-called LDPE), linear low-density polyethylene (so-called LLDPE), medium-density polyethylene (so-called MDPE), and high-density polyethylene (so-called HDPE). Can be mentioned.

From the viewpoint of extensibility and flexibility of the non-woven fabric, the density of the ethylene polymer (B) is preferably 0.930 g / cm ^{3 to} 0.980 g / cm ³ . In particular, in view of spinnability aspects and strength, the density of the ethylene polymer (B) ^is preferably ^{0.940g / cm 3 ~0.980g / cm 3} , 0.940g / cm 3 ~0 More preferably, it is .975 g / cm ³ . In ^particular, 0.950 g / cm 3 density polyethylene in the range of ~0.970g / cm ³ (HDPE) is preferred. The density is a value obtained by measuring according to the density gradient method of JIS K7112 (1999).

The melt flow rate (MFR: ASTM D1238, 190 ° C., load 2160 g) of the ethylene polymer (B) is not particularly limited as long as it can be melt-spun. The melt flow rate of the ethylene polymer (B) is preferably 1 g / 10 minutes to 50 g / 10 minutes. The melt flow rate of the ethylene polymer (B) is more preferably 2 g / 10 minutes to 25 g / 10 minutes, and further preferably 2 g / 10 minutes to 10 g / 10 minutes.

As the ethylene-based polymer (B), a polymer obtained by various known production methods (for example, a high-pressure method, a medium-low pressure method obtained by using a Ziegler catalyst or a metallocene catalyst) can be used. Among these polymers, when an ethylene-based polymer obtained by polymerization with a metallocene-based catalyst is used, the spinnability of the propylene-based polymer composition becomes better, and the strength of the obtained spunbonded non-woven fabric and the like are improved. It is preferable from the viewpoint of goodness.

The ethylene-based polymer (B) may be used alone in the propylene-based polymer composition, or two or more kinds having different melting points, molecular weights, crystal structures, etc. may be used.

-Ethylene polymer wax (C)-
As another embodiment, the propylene-based polymer composition may further contain an ethylene-based polymer wax (C) having a weight average molecular weight (Mw) of 400 to 30,000, if necessary. The ethylene-based polymer wax (C) is not particularly limited as long as it has a weight average molecular weight (Mw) of 400 to 30,000.
In the present disclosure, the ethylene-based polymer wax (C) refers to a wax-like polymer having a lower molecular weight than the above-mentioned ethylene-based polymer (B).

The ethylene-based polymer wax (C) may be either a homopolymer of ethylene or a copolymer of ethylene and an α-olefin having 3 to 20 carbon atoms.
When a copolymer of ethylene and an α-olefin having 3 to 20 carbon atoms is used as the ethylene-based polymer wax (C), the α-olefin having 3 to 8 carbon atoms to be copolymerized with ethylene is more preferably 3 to 8 carbon atoms. , 3 or 4 carbon atoms are more preferable, and 3 carbon atoms are further preferable.
When the number of carbon atoms of the α-olefin copolymerized with ethylene is in the above range, the spinnability is improved and the properties such as the strength of the non-woven fabric can be enhanced.
When an ethylene homopolymer is used as the ethylene-based polymer wax (C), it is excellent in kneadability with the ethylene-based polymer (B) and excellent in spinnability.

The weight average molecular weight (Mw) of the ethylene polymer wax (C) is preferably 15,000 or less. It is preferably less than 15,000, more preferably 9000 or less, further preferably 6000 or less, particularly preferably less than 6000, and most preferably 5000 or less. The lower limit is preferably 400 or more, and more preferably 1000 or more. When the weight average molecular weight (Mw) of the ethylene-based polymer wax (C) is within the above range, the spinnability of the propylene-based polymer composition is likely to be improved, the fiber diameter is likely to be reduced, and the fiber diameter is likely to be reduced over time. Stability can be easily obtained.

The weight average molecular weight (Mw) of the ethylene-based polymer wax (C) is a value obtained from a gel permeation chromatography (GPC) method, and is a value measured under the following conditions.
The weight average molecular weight is determined based on the following conversion method by preparing a calibration curve using commercially available monodisperse standard polystyrene.

Equipment: Gel permeation chromatograph Alliance GPC2000 type (manufactured by Waters)
Solvent: o-dichlorobenzene Column: TSKgel column (manufactured by Toso Co., Ltd.) x 4
Flow rate: 1.0 ml / min Sample: 0.15 mg / mLo-dichlorobenzene solution Temperature: 140 ° C
Molecular weight conversion: PE conversion / general-purpose calibration method The coefficients of the Mark-Houwink viscosity formula shown below were used for the calculation of general-purpose calibration.
Polystyrene (PS) coefficient: KPS = 1.38 × ^10-4 , aPS = 0.70
Coefficient of polyethylene (PE): KPE = 5.06 × ^10-4 , aPE = 0.70

The ethylene polymer wax (C) preferably has a softening point of 90 ° C. to 145 ° C., more preferably 90 ° C. to 130 ° C., as measured according to JIS K2207 (2006).

From the viewpoint of stable spinning, the content of the ethylene-based polymer wax (C) is 0.1 part by mass to 10 parts by mass with respect to 100 parts by mass of the propylene-based polymer (A). It is preferably 0.5 parts by mass to 5 parts by mass, more preferably.

The method for producing the ethylene-based polymer wax (C) is not particularly limited, and is a method for producing a low molecular weight polymer which is usually used, or a method for reducing the molecular weight of a high molecular weight ethylene-based polymer by heating and reducing it. Any manufacturing method such as, etc. may be used.

Further, the ethylene-based polymer wax (C) may be purified by a method such as solvent fractionation in which the wax (C) is fractionated according to the difference in solubility in a solvent, or distillation.
When the ethylene-based polymer wax (C) can be obtained by a commonly used method for producing a low molecular weight polymer by polymerization, various known production methods such as Ziegler / Natta catalyst and JP-A-08-239414 It can be produced by the production method of polymerizing with a metallocene-based catalyst or the like described in International Publication No. 2007/114102 or the like.

The density of the ethylene polymer wax (C) is not particularly ^limited, it is preferably from ^{0.890g / cm 3 ~0.980g / cm 3} , more preferably 0.910 g / cm ³ or more, It is more preferably 0.920 g / cm ³ or more.
The density of the ethylene polymer wax (C) is preferably 0.960 g / cm ³ or less, and more preferably 0.950 g / cm ³ or less. When the ethylene-based polymer wax (C) having a density range within the above range is used, the spinnability tends to be excellent.

The ethylene-based polymer wax (C) may be used alone in the propylene-based polymer composition, or two or more kinds having different melting points, molecular weights, crystal structures, etc. may be used.

-Propylene polymer (D) shown in (III)-
As another embodiment, the propylene-based polymer composition may contain the propylene-based polymer (D) shown in the following (III), if necessary. The content of the propylene-based polymer (hereinafter, also referred to as polymer (III)) shown in (III) below is preferably more than 0 parts by mass and 25 parts by mass or less in the propylene-based polymer composition.

(III) Propylene homopolymer having a melting point of less than 120 ° C. satisfying the following (a) to (f) (a) [mmmm] = 20 mol% to 60 mol%
(B) [rrrr] / (1- [mmmm]) ≦ 0.1
(C) [rmrm]> 2.5 mol%
(D) [mm] × [rr] / [mr] 2 ≦ 2.0
(E) Weight average molecular weight (Mw) = 10,000 to 200,000
(F) Molecular weight distribution (Mw / Mn) <4
In (a) to (d), [mmmm] is a racemic pentad fraction, [rrrr] is a racemic pentad fraction, and [rmrm] is a racemic mesolacemic mesopentad fraction, [m.
m], [rr] and [mr] are triad fractions, respectively.

The mesopentad fraction [mmmm], racemic pentad fraction [rrrr] and racemic mesolazemimesopentad fraction [rmrm], triad fraction [mm], [rr] and [mr] of the polymer (III) are , As described in detail below, can be calculated according to the method proposed by A. Zambelli et al. In "Macromomolecules, 6,925 (1973)".

(A) [mmmm] = 20 to 60 mol%:
When the mesopentad fraction [mm mm] of the polymer (III) is 20 mol% or more, the occurrence of stickiness is suppressed, and when it is 60 mol% or less, the crystallinity does not become too high, so that the elasticity is restored. The property becomes good. The mesopentad fraction [mm mm] is preferably 30 mol% to 50 mol%, more preferably 40 mol% to 50 mol%.

The mesopentad fraction [mmmm], the racemic pentad fraction [rrrr] and the racemic mesola semimesopentad fraction [rmrm], which will be described later, are described in "Macromolecules, 6,925 (1973)" by A. Zambeli et al. The meso-parts, racemic, and racemic meso-meso-meso fractions in pentad units in the polypropylene molecular chain measured by the signal of the methyl group in the ¹³ C-NMR spectrum, according to the method proposed in. .. The larger the mesopentad fraction [mm mm], the higher the stereoregularity. Further, the triad fractions [mm], [rr] and [mr] described later are also calculated by the above method.

¹³ The measurement of the C-NMR spectrum can be carried out under the following equipment and conditions according to the peak attribution proposed in "Macromomolecules, 8, 687 (1975)" by A. Zambelli et al.

Equipment: JNM-EX400 type ¹³ C-NMR equipment manufactured by JEOL Ltd. Method: Proton complete decoupling method Concentration: 220 mg / ml
Solvent: 90:10 (volume ratio) mixture of 1,2,4-trichlorobenzene and heavy benzene Solvent temperature: 130 ° C
Pulse width: 45 °
Pulse repetition time: 4 seconds integration: 10000 times

[a formula]
M = m / S × 100
R = γ / S × 100
S = Pββ + Pαβ + Pαγ
S: Signal intensity of side chain methyl carbon atom of all propylene units Pββ: 19.8 to 22.5 ppm
Pαβ: 18.0 to 17.5 ppm
Pαγ: 17.5 to 17.1 ppm
γ: Racemic pentad chain: 20.7 to 20.3 ppm
m: Mesopentad chain: 21.7 to 22.5 ppm

(B) [rrrr] / (1- [mmmm]) ≦ 0.1
The value of [rrrr] / [1-mmmm] is obtained from the above-mentioned fraction of the pentad unit, and is an index showing the uniformity of the regularity distribution of the structural unit derived from propylene in the polymer (III). When this value becomes large, it becomes a mixture of highly regular polypropylene and atactic polypropylene like the conventional polypropylene manufactured by using the existing catalyst system, which causes stickiness.
In the polymer (III), when [rrrr] / (1- [mmmm]) is 0.1 or less, the stickiness of the obtained elastic nonwoven fabric is suppressed. From such a viewpoint, [rrrr] / (1- [mmmm]) is preferably 0.05 or less, and more preferably 0.04 or less.

(C) [rmrm]> 2.5 mol%
When the racemic mixture semi-meso fraction [rmrm] of the polymer (III) exceeds 2.5 mol%, the randomness of the polymer (III) increases. [Rmrm] is preferably 2.6 mol% or more, and more preferably 2.7 mol% or more. The upper limit is usually about 10 mol%.

(D) [mm] × [rr] / [mr] ² ≦ 2.0
[Mm] × [rr] / [mr] ² indicates the randomness index of the polymer (III), and the stickiness is also suppressed. The closer [mm] × [rr] / [mr] ² is to 0.25, the higher the randomness. From the viewpoint of obtaining the above-mentioned sufficient elastic recovery, [mm] × [rr] / [mr] ² is preferably more than 0.25 and not more than 1.8, and is 0.5 to 1.5. Is more preferable.

(E) Weight average molecular weight (Mw) = 10,000 to 200,000
When the weight average molecular weight of the polymer (III) is 10,000 or more, the viscosity of the polymer (III) is not too low and is appropriate. Therefore, yarn breakage when the nonwoven fabric is manufactured by the spunbond method is suppressed. Further, when the weight average molecular weight is 200,000 or less, the viscosity of the polymer (III) is not too high and the spinnability is improved. The weight average molecular weight is preferably 30,000 to 150,000, more preferably 50,000 to 150,000. The method for measuring the weight average molecular weight of the polymer (III) will be described later.

(F) Molecular weight distribution (Mw / Mn) <4
When the molecular weight distribution (Mw / Mn) of the polymer (III) is less than 4, the occurrence of stickiness in the obtained spunbonded nonwoven fabric is suppressed. This molecular weight distribution is preferably 3 or less.
The weight average molecular weight (Mw) is a polystyrene-equivalent weight average molecular weight measured by a gel permeation chromatography (GPC) method under the following equipment and conditions, and the molecular weight distribution (Mw / Mn) is similarly the same. It is a value calculated from the measured number average molecular weight (Mn) and the weight average molecular weight (Mw).

[GPC measuring device]
Column: TOSO GMHHR-H (S) HT
Detector: RI detector for liquid chromatogram WATERS 150C
[Measurement condition]
Solvent: 1,2,4-trichlorobenzene measured temperature: 145 ° C
Flow velocity: 1.0 ml / min Sample concentration: 2.2 mg / ml
Injection volume: 160 μl
Calibration curve: Universal Calibration
Analysis program: HT-GPC (Ver.1.0)

It is preferable that the polymer (III) further satisfies the following requirement (g).
(G) Observed on the hottest side of the melting endothermic curve obtained by holding at -10 ° C for 5 minutes under a nitrogen atmosphere and then raising the temperature at 10 ° C / min using a differential scanning calorimeter (DSC). The melting point (Tm-D) defined as the peak top of the peak is 0 ° C to 120 ° C.

When the melting point (Tm-D) of the polymer (III) is 0 ° C. or higher, the occurrence of stickiness of the spunbonded non-woven fabric formed by the propylene-based polymer composition is suppressed, and when it is 120 ° C. or lower, it is sufficient. Elastic recovery is obtained. From this point of view, the melting point (Tm−D) is more preferably 0 ° C. to 100 ° C., still more preferably 30 ° C. to 100 ° C.

The melting point (Tm-D) is 10 ° C./min after holding 10 mg of the sample in a nitrogen atmosphere at -10 ° C. for 5 minutes using a differential scanning calorimeter (DSC-7, manufactured by PerkinElmer). It can be obtained as the peak top of the peak observed on the highest temperature side of the melting endothermic curve obtained by raising the temperature in.

The polymer (III) can be synthesized, for example, using a homogeneous catalyst, a so-called metallocene catalyst (see, for example, International Publication No. 2003/0871772).

The propylene-based polymer (D) shown in (III) above may be used alone in the propylene-based polymer composition, or two or more kinds having different melting points, molecular weights, crystal structures, etc. may be used. Good.

It can be appropriately confirmed by a known method that each of the above components is contained in the fibers of the thermoplastic polymer (including the thermoplastic polymer composition) constituting the non-woven fabric of the present disclosure.

Nonwoven basis weight of the present disclosure is not particularly limited, for example, basis weight of the spunbonded nonwoven fabric ^may be ^{5g / m 2 ~30g / m 2} , may be 10g / ^{m 2} ~25g / m 2 ..

The average fiber diameter of the fibers constituting the non-woven fabric is not particularly limited, and may be, for example, 5 μm to 25 μm. The average fiber diameter may be 20 μm or less, 18 μm or less, or 15 μm or less. Further, the average fiber diameter may be 7 μm or more, or 10 or more.

(Additive)
The propylene-based polymer composition contains antioxidants, heat-resistant stabilizers, weather-resistant stabilizers, antistatic agents, slip agents, antifogging agents, lubricants, dyes, and pigments as optional components as long as the object of the present invention is not impaired. , Natural oils, synthetic oils, waxes other than ethylene-based polymer wax (C), and various other known additives may be contained.

The non-woven fabric of the present disclosure may contain other components, if necessary. Other components include, for example, antioxidants, heat-resistant stabilizers, weather-resistant stabilizers, antistatic agents, slip agents, antifogging agents, lubricants, dyes, pigments, light-resistant stabilizers, blocking inhibitors, dispersants, nucleating agents. , Softeners, water repellents, fillers, natural oils, synthetic oils, waxes other than ethylene polymer wax (C), antibacterial agents, preservatives, matting agents, rust preventives, fragrances, defoamers, Various known additives such as antifungal agents and insect repellents can be mentioned. These other components may be contained inside the fibers constituting the non-woven fabric, or may be attached to the surface of the fibers.

Although the propylene-based polymer composition has been described as an example of the thermoplastic polymer constituting the fibers of the thermoplastic polymer, the thermoplastic polymer is not limited to this.

(Physical properties of non-woven fabric)
The non-woven fabric of the present disclosure is the ratio of the surface water vapor adsorption area in the water vapor adsorption test obtained by the water vapor adsorption isotherm BET formula to the surface nitrogen adsorption area in the nitrogen adsorption test obtained by the BET formula of the nitrogen adsorption isotherm (surface water vapor adsorption area). / Surface nitrogen adsorption area) is 2.0 to 5.8. This area ratio is preferably 2.5 to 5.5, and more preferably 3 to 5.5. This area ratio is an index of the balance between hydrophilicity and hydrophobicity per surface area of the non-woven fabric. When this area ratio is in the above range, the non-woven fabric is excellent in hydrophilicity, and the migration of the hydrophilic agent when it comes into contact with other members is suppressed. The measuring method of the water vapor adsorption test obtained by the BET method of the water vapor adsorption isotherm and the measuring method of the surface nitrogen adsorption area in the nitrogen adsorption test obtained by the BET method of the nitrogen adsorption isotherm will be described in Examples described later.

The surface water vapor adsorption area of the non-woven fabric of the present disclosure is 0.5 m ² / g to 1. From the viewpoint of obtaining a non-woven fabric having excellent hydrophilicity and suppressing the migration of the hydrophilic agent when in contact with other members. it is preferably 2m ² / ^g, more preferably 0.6m ² /g~1.2m 2 / g. For the above range of the surface water vapor adsorption area and the above range of the area ratio of the surface water vapor adsorption area to the surface nitrogen adsorption area, for example, the production conditions such as the type, amount and coating method of the hydrophilic agent contained in the non-woven fabric are adjusted. It is possible to satisfy.

(Aspect of non-woven fabric)
The non-woven fabric of the present disclosure is not particularly limited, and may be a non-woven fabric of any aspect of a long-fiber non-woven fabric and a short-fiber non-woven fabric. Specifically, the non-woven fabric of the present disclosure can be exemplified as a non-woven fabric manufactured by a spunbond method, a melt blown method, a flash spinning method, a wet method, a card method, an air raid method, an electrostatic spinning method or the like. From the viewpoint of productivity, the non-woven fabric of the present disclosure is preferably a long-fiber non-woven fabric. The long-fiber non-woven fabric is preferably a non-woven fabric produced by the spunbond method (that is, a spunbond non-woven fabric) or a non-woven fabric produced by the melt-blown method (that is, a melt-blown non-woven fabric). In particular, a spunbonded non-woven fabric is preferable.
In the present disclosure, the term "short fiber" generally means a fiber having an average fiber length of 200 mm or less. The term "long fiber" refers to "continuous filament" commonly used in the art, such as the Nonwoven Fabric Handbook (edited by the American Nonwoven Fabric Industry Association, Nonwoven Fabric Information Co., Ltd., 1996). ..

The non-woven fabric of the present disclosure may be a single-layer non-woven fabric or a multi-layered non-woven fabric (nonwoven fabric multilayer structure) in which a plurality of layers are laminated. The non-woven fabric multilayer structure may be, for example, a multilayer structure in which spunbonded non-woven fabrics are laminated, or a multilayer structure in which spunbonded nonwoven fabrics and meltblown nonwoven fabrics are laminated. When the nonwoven fabric of the present disclosure is a multilayer structure, it is preferable that all layers of the multilayer structure contain a hydrophilic agent. In the present disclosure, the non-woven fabric which is a multilayer structure containing a hydrophilizing agent is referred to as a nonwoven fabric multilayer structure and is distinguished from the laminate described later.

<Manufacturing method of non-woven fabric>
The method for obtaining the non-woven fabric of the present disclosure is not particularly limited, and it is preferable to produce it by the following method.
Hereinafter, an example of a preferable manufacturing method of the nonwoven fabric of the present disclosure will be described.
The method for producing a nonwoven fabric of the present disclosure has the following steps.
A step of preparing a non-woven fabric containing fibers of a thermoplastic polymer (nonwoven fabric preparation step).
A step of adhering a penetrant containing at least one of a sulfonate and a sulfate ester and a wetting agent to the non-woven fabric (hydrophilic agent adhering step).
Then, in the step of adsorbing the hydrophilic agent, by adsorbing a specific penetrant and a wetting agent (that is, a hydrophilic agent) to the non-woven fabric in an appropriate amount, the amount of the hydrophilic agent attached to the fibers constituting the non-woven fabric. The ratio of the surface water vapor adsorption area in the water vapor adsorption test obtained by the water vapor adsorption isotherm BET formula to the surface nitrogen adsorption area in the nitrogen adsorption test obtained by the BET formula of the nitrogen adsorption isotherm (surface). A non-woven fabric having a water vapor adsorption area / surface nitrogen adsorption area) of 2.0 to 5.8 can be obtained. For example, the surface water vapor adsorption area and the surface nitrogen adsorption area are the conditions of the hydrophilizing agent (amount, type, blending, etc. of the wetting agent and penetrant), manufacturing conditions (coating method, treatment step after coating, etc.), and these. It can be adjusted by the combination.

(Non-woven fabric preparation process)
The non-woven fabric preparation step is a step of preparing a non-woven fabric to be attached to the hydrophilic agent.
The non-woven fabric to be prepared is not particularly limited, and a commercially available product may be prepared or a non-woven fabric may be produced. Further, the non-woven fabric to be prepared may be a single-layer non-woven fabric or a multi-layer non-woven fabric. When the non-woven fabric is produced, it may be produced by a known method for producing a long-fiber non-woven fabric or a known method for producing a short-fiber non-woven fabric. From the viewpoint of productivity, the non-woven fabric to be prepared is preferably a long-fiber non-woven fabric, and more preferably a non-woven fabric produced by the spunbond method. In the case of the spunbond method, for example, a step of melt-spinning a thermoplastic polymer to form continuous fibers (spinning step) and a step of collecting continuous fibers to form a non-woven web (non-woven web forming step). And the step of entwining the non-woven web (entanglement step), the spunbonded non-woven fabric is manufactured. When the spunbonded nonwoven fabric is composed of multiple layers, a step of forming a second continuous fiber (second spinning step) may be provided between the non-woven web forming step and the entanglement step. Continuous fibers are collected on the first non-woven web to form a second non-woven web, and a multi-layer spunbonded non-woven fabric is produced through the entanglement step of the next step. The spinning process includes a known process of cooling and stretching.

(Hydrophilic agent adhesion process)
The hydrophilic agent adhering step is a step of adhering the above-mentioned hydrophilic agent to the non-woven fabric prepared in the above-mentioned non-woven fabric preparation step. As long as the hydrophilic agent can be attached to the non-woven fabric, the method of attaching the hydrophilic agent is not particularly limited. For example, the hydrophilic agent is preferably attached by applying a solution of the hydrophilic agent in a solvent (for example, a volatile organic solvent such as methanol, ethanol and isopropyl alcohol, or water) to the non-woven fabric. .. Examples of the method for adhering the hydrophilic agent to the non-woven fabric include known methods such as dipping (immersion), roll coating (gravure coating, kiss coating), spray coating, and die coating. In the present disclosure, "coating" is a concept including "dipping (immersion)".

When attaching the hydrophilic agent to the non-woven fabric, it is preferable to dissolve the hydrophilic agent in a solvent such as water to obtain a solution of the hydrophilic agent, and to apply the solution of the hydrophilic agent to the non-woven fabric. From the viewpoint of facilitating the application of the hydrophilizing agent solution, the hydrophilizing agent solution should contain a penetrant and a wetting agent as active ingredients, and the total amount of the active ingredients should be 0.1% by mass to 30% by mass. Is preferable. The solution of the hydrophilizing agent may contain additives such as antibacterial agents, antioxidants, preservatives, matting agents, pigments, rust preventives, fragrances, and defoamers, depending on the purpose. ..

(Other processes)
Other steps may be included after the step of adhering the hydrophilizing agent. Other steps include a squeezing step for removing an excess solution of the hydrophilic agent from the non-woven fabric, a drying step for removing the solvent in the solution of the hydrophilic agent, and the like.

The drawing step is a step of removing the excess solution of the hydrophilic agent from the non-woven fabric. In other words, it is a step of adjusting the amount of the hydrophilic agent applied to the non-woven fabric. The above-mentioned surface water vapor adsorption area and coating amount can also be adjusted by the type and amount of the hydrophilizing agent solution used in the coating step and the amount of the hydrophilizing agent solution removed in the drawing step. In the squeezing step, for example, the non-woven fabric is passed through the nip roll, squeezed by hand, and the like, so that the excess solution of the hydrophilic agent can be removed.

The drying step is a step of removing unnecessary solvent derived from the hydrophilic agent from the non-woven fabric. The heating temperature and heating time in the drying step are not particularly limited as long as the solvent can be sufficiently removed. Examples of the drying condition include a condition of exposing to an environment of 80 ° C. to 200 ° C. for 1 second to 24 hours.

<Laminated body>
The laminate of the present disclosure may include the non-woven fabric of the present disclosure. That is, the laminate of the present disclosure may have a structure in which the hydrophilic non-woven fabric of the present disclosure and the separately hydrophilic non-woven fabric of the present disclosure are laminated and laminated. Further, the non-woven fabric of the present disclosure may have a structure in which layers other than the non-woven fabric of the present disclosure are laminated. The other layer may be one layer or two or more layers.

Examples of the other layer include fiber aggregates such as knitted fabrics, woven fabrics, and non-woven fabrics other than the non-woven fabrics of the present disclosure (short-fiber non-woven fabrics, long-fiber non-woven fabrics). Examples of the non-woven fabric other than the non-woven fabric of the present disclosure include various known non-woven fabrics (spunbond non-woven fabric, melt blown non-woven fabric, wet non-woven fabric, dry non-woven fabric, dry pulp non-woven fabric, flash spun non-woven fabric, spread fiber non-woven fabric, etc.). The fiber aggregate may be a sheet of natural fibers such as cotton. Further, examples of the other layer include resin films such as polyolefin, polyester, and polyamide. These may be combined and laminated. For example, the non-woven fabric of the present disclosure, a resin film, and a fiber aggregate of natural fibers such as cotton may be laminated in this order.

As the film to be laminated with the non-woven fabric of the present disclosure, a breathable film and a moisture-permeable film are preferable when the laminated body requires breathability.
Examples of the breathable film include various known breathable films. Examples thereof include a film of a thermoplastic elastomer such as a moisture-permeable polyurethane elastomer, a polyester elastomer, and a polyamide elastomer, and a porous film obtained by stretching a thermoplastic resin film containing inorganic particles or organic particles to make it porous. .. Examples of the thermoplastic resin used for the porous film include polyolefins such as high-pressure low-density polyethylene, linear low-density polyethylene (so-called LLDPE), high-density polyethylene, polypropylene, polypropylene random copolymer, and a combination thereof.
When the non-woven fabric laminate does not require breathability, one or more non-porous thermoplastic resin films selected from polyolefin (polyethylene, polypropylene, etc.), polyester, and polyamide may be used.

The method of further laminating (bonding) another layer to the non-woven fabric of the present disclosure is not particularly limited, and a thermal fusion method such as thermal embossing or ultrasonic fusion, a mechanical entanglement method such as needle punching or water jet, etc. Examples thereof include a method using an adhesive such as a hot melt adhesive and a urethane adhesive, and various methods such as extrusion laminating.

<Coating sheet>
The coated sheet of the present disclosure includes the non-woven fabric of the present disclosure. The coating sheet of the present disclosure is not particularly limited as long as it contains the non-woven fabric of the present disclosure, and the non-woven fabric of the present disclosure may be a single layer, a non-woven fabric multilayer structure, and includes the non-woven fabric of the present disclosure. It may be a laminated body. The coating sheet of the present disclosure preferably contains the laminate of the present disclosure from the viewpoint of imparting functionality. The covering sheet of the present disclosure refers to a sheet for covering at least a part of a target object. The application to which the covering sheet is applied is not particularly limited, and various applications can be mentioned. Specific examples of the covering sheet include absorbent articles (disposable diapers, disposable pants, sanitary products, urine absorbing pads, pet sheets, etc.), cosmetic materials (face masks, etc.); sanitary materials (wet cloth materials, sheets, etc.). Towels, industrial masks, sanitary masks, hair caps, etc.); Packaging materials (deoxidizers, cairo, warm ships, food packaging materials), etc.

Hereinafter, the present invention will be described in more detail based on Examples, but the present invention is not limited to these Examples. In the following examples, "%" represents mass%.

Physical property values and the like in Examples and Comparative Examples were measured by the following methods.

(1) Metsuke [g / m ² ]
From the obtained non-woven fabric, 10 test pieces of 100 mm (flow direction: MD) × 100 mm (direction orthogonal to the flow direction: CD) were collected. The test pieces were collected at 10 locations in the CD direction. Then, in an environment of 23 ° C. and a relative humidity of 50% RH, the mass [g] of each of the collected test pieces was measured using a precision electronic balance (manufactured by Kensei Kogyo Co., Ltd.). The average value of the mass of each test piece was calculated. The calculated average value was converted into mass [g] per 1 m ² , and the second decimal place was rounded off to obtain the basis weight [g / m ² ] of each non-woven fabric sample.

(2) Liquid flow distance (mm)
The obtained non-woven fabric was cut into a size of 100 mm × 200 mm and used as a sample. Five filter papers (No. 2, manufactured by Advantech) are placed on a plate fixed at an angle of 45 degrees with respect to the horizontal direction, and the sample is placed on the filter paper, and both ends in the longitudinal direction of the sample are placed. It was fixed on the board together with the filter paper. In an environment of 25 ° C, from a height of about 10 mm perpendicular to the sample surface, 0.1 ml of artificial urine is dropped with a dropper, and from the drop point of the droplet to the point where the droplet is completely absorbed. Was measured and used as the liquid flow distance (mm).
The liquid flow distance was evaluated based on the following evaluation criteria. The results are shown in Table 1.
As the artificial urine, an aqueous solution of sodium chloride (9 g / liter) having a surface tension of 70 ± 2 mN / m was used.

(3) Strikethrough test EDANA (European Nonwoven Fabric Industry Association) standard NWSP 070.8. Measured according to R0 (15). The results of the first time and the results of the third time were recorded.

(4) Evaluation of transferability of hydrophilic agent The non-woven fabric obtained in each example was cut into a size of 100 mm × 100 mm. Further, a non-woven fabric (nonwoven fabric to be transferred) made of homopolypropylene having a basis weight of 25 g / m ² and containing no hydrophilicizing agent was cut into a size of 100 mm × 100 mm. The two non-woven fabrics were put together, and a 4 kg weight having a cross-sectional area of 100 mm × 100 mm was placed on the weight. In addition, in order to prevent the transfer of the hydrophilic agent to the weight and the floor surface, it may be wrapped with a film. The non-woven fabric on which the weight was placed was left in an environment of 60 ° C. and a relative humidity of 80% RH for 1 week. When the non-woven fabric to be transferred was taken out, 1 drop (0.02 ml) of water was dropped, and soaked, it was judged that hydrophilicity was exhibited and the hydrophilicity agent transferability was poor (in Table 1, "bad"). Notation). When it did not soak, hydrophilicity was not exhibited, and it was judged that the hydrophilicity agent transferability was good (indicated as "good" in Table 1).

(5) Evaluation of surface water vapor adsorption area in water vapor adsorption test Measurement was performed using Microtrack Bell Co., Ltd. equipment BELSORP-max.
Specifically, it was carried out as follows. First, a sample of about 0.50 g to 1.0 g was taken from the non-woven fabric and set in the apparatus. Then, a drying treatment by vacuum exhaust was performed at room temperature (25 ° C.) for 8 hours. Then, water vapor was adsorbed at 25 ° C. by changing the introduction pressure, and the water vapor adsorption isotherm was measured by plotting the amount of water vapor adsorbed for each introduction pressure. Then, the following BET formula was applied to determine the specific surface area [m ² / g] as the surface water vapor adsorption area. The BET equation is an equation expressing the relationship between the adsorption equilibrium pressure P and the adsorption amount V at that pressure when the adsorption equilibrium state is reached at a constant temperature.

(BET formula): P / (V (P ₀ −P)) = 1 / (Vm × C) + {((C-1) / (Vm × C)) × (P / P ₀ )}
In the formula, P ₀ : saturated water vapor pressure (Pa), Vm: single molecule layer adsorption amount (mg / g), C: parameters related to heat of adsorption and the like (−) <0. This relational expression holds particularly well in the range of P / P ₀ = 0.05 to 0.35.

(6) Ratio of surface water vapor adsorption area to surface nitrogen adsorption area Next, the test was performed from sample collection in the same procedure as the water vapor adsorption test except that nitrogen was used instead of water vapor, and the nitrogen adsorption isotherm was measured. .. Then, the specific surface area as the surface nitrogen adsorption area was determined by the above BET formula. From the specific surface area as the surface water vapor adsorption area obtained above and the specific surface area as the surface nitrogen adsorption area obtained above, the ratio is calculated by "(specific surface area with water vapor) ÷ (specific surface area with nitrogen)". I asked.

(7) Measurement of coating amount The mass of the non-woven fabric before applying the hydrophilic agent (mass before coating) and the mass of the non-woven fabric after applying and drying the hydrophilic agent (mass after coating) are measured to make the non-woven fabric hydrophilic. The amount of the agent applied was calculated from the following formula.
Coating amount (%) = (mass after coating-mass before coating) / mass after coating x 100

<Example 1>
The following propylene-based polymer composition is used for melt spinning, and the obtained fibers are deposited on the complement surface, and then spunbond having an average fiber diameter of 18 μm and a basis weight of 25 g / m ² by thermal embossing. A non-woven fabric (SB) was obtained.

(Propylene-based polymer composition)
Propylene-based polymer (A): Propylene homopolymer 1 (MFR (ASTM D1238, 230 ° C., load 2160 g): 60 g / 10 minutes, melting point 162 ° C., also referred to as "PP1") 100 parts by mass Ethylene-based polymer (B) ): Polyethylene (MFR (ASTM D1238, 190 ° C., load 2160 g): 5 g / 10 minutes, density 0.964 g / cm ³ , melting point 164 ° C.) 4 parts by mass

The average fiber diameter is a value obtained as follows. Ten test pieces of 10 mm × 10 mm were sampled from the obtained spunbonded non-woven fabric, and the diameter of the fiber was read to the first decimal place at a magnification of 20 times using an ECLIPSE E400 microscope manufactured by Nikon Corporation. The diameters of 20 arbitrary points were measured for each test piece, and the average value was calculated.

Next, each component was dissolved in an aqueous solution so as to have the following blending ratio to obtain an aqueous solution of the hydrophilic agent A having a total amount of the active ingredient of 5% by mass.

(Hydrophilic agent A)
Di (2-ethylhexyl) Na sulfosuccinate: 20% by mass
Glycerin oleic acid diester: 30% by mass
Polyoxyethylene glycerin lauric acid diester / polyoxyethylene glycerin trilauric acid ester = 4: 6 (mass ratio) (EO chain 8 mol adduct): 20% by mass
Polyoxyethylene dilauric acid ester (8 mol adduct of EO chain): 30% by mass
The above-mentioned compounding ratio (% by mass) is the ratio of each component to the total mass of the active ingredient in the hydrophilic agent A, that is, in the aqueous solution of the hydrophilic agent A.

Next, the obtained spunbonded non-woven fabric was immersed in an aqueous solution of the following hydrophilizing agent A (active ingredient 5% by mass), squeezed, and then dried in a drying oven at 100 ° C. When the mass of the hydrophilic agent adhering to the non-woven fabric was measured according to the measurement of the coating amount, the coating amount was 0.6% by mass. The physical properties of the non-woven fabric (hereinafter referred to as hydrophilic non-woven fabric) obtained by adhering the hydrophilizing agent were measured according to the method described above.

<Example 2>
A hydrophilic non-woven fabric was obtained in the same manner as in Example 1 except that an aqueous solution of the hydrophilizing agent A having a total amount of the active ingredient of 10% by mass was prepared and applied so that the coating amount was 0.9% by mass.

<Example 3>
A spunbonded nonwoven fabric was obtained in the same manner as in Example 1 except that the following propylene-based polymer composition was used. Then, in the same manner as in Example 1, a hydrophilic agent was attached to the spunbonded nonwoven fabric. Table 1 shows the physical properties of the obtained hydrophilic non-woven fabric.

(Propylene-based polymer composition)
Propylene-based polymer (A): 100 parts by mass of propylene homopolymer (PP1) similar to Example 1 Ethylene-based polymer (B): 4 parts by mass of polyethylene similar to Example 1 Ethylene-based polymer wax (C) : Mitsui Chemicals Co., Ltd., Product name "High Wax 110P" (Density: 0.922 g / cm ³ , Weight average polymer weight: 1200, Softening point: 113 ° C] 1 part by mass

<Example 4>
A spunbonded non-woven fabric was obtained in the same manner as in Example 3 except that the following propylene-based polymer composition was used. Then, in the same manner as in Example 1, a hydrophilic agent was attached to the spunbonded nonwoven fabric. Table 1 shows the physical properties of the obtained hydrophilic non-woven fabric.

(Propylene-based polymer composition)
Propylene-based polymer (A): Propylene homopolymer 2 (MFR ((ASTM D1238, 230 ° C., load 2160 g)): 35 g / 10 minutes, melting point 160 ° C., also referred to as “PP2”) 100 parts by mass,
Ethylene-based polymer (B): 4 parts by mass of polyethylene similar to Example 1 Ethylene-based polymer wax (C): 1 part by mass of ethylene-based polymer wax similar to Example 3.

<Example 5>
A spunbonded nonwoven fabric was obtained in the same manner as in Example 1 except that the following propylene-based polymer composition was used. Then, in the same manner as in Example 1, a hydrophilic agent was attached to the spunbonded nonwoven fabric. Table 1 shows the physical properties of the obtained hydrophilic non-woven fabric.

(Propylene-based polymer composition)
Propylene-based polymer (A): 100 parts by mass of the same propylene homopolymer (PP1) as in Example 1.
Ethylene-based polymer (B): 4 parts by mass of polyethylene similar to Example 1 Propylene-based polymer (D): S901 (trade name) manufactured by Idemitsu Kosan Co., Ltd., which satisfies the above-mentioned (a) to (f). , 12 parts by mass of propylene homopolymer having a melting point of less than 120 ° C.

<Example 6>
A spunbonded nonwoven fabric was obtained in the same manner as in Example 1 except that the following propylene-based polymer composition was used. Then, in the same manner as in Example 1, a hydrophilic agent was attached to the spunbonded nonwoven fabric. Table 1 shows the physical properties of the obtained hydrophilic non-woven fabric.

(Propylene-based polymer composition)
Propylene-based polymer (A): propylene-ethylene random polymer (MFR (ASTM D1238, 230 ° C., load 2160 g): 60 g / 10 minutes, melting point 142 ° C., also referred to as "PP3") 100 parts by mass ethylene-based polymer ( B): 4 parts by mass of polyethylene similar to Example 1.

<Example 7>
A spunbonded nonwoven fabric was obtained in the same manner as in Example 6 except that the following propylene-based polymer composition was used. Then, in the same manner as in Example 6, a hydrophilic agent was attached to the spunbonded nonwoven fabric. Table 1 shows the physical properties of the obtained hydrophilic non-woven fabric.

(Propylene-based polymer composition)
Propylene-based polymer (A): 100 parts by mass of propylene / ethylene random copolymer (PP3) used in Example 6 Ethylene-based polymer (B): 4 parts by mass of polyethylene similar to Example 1 Ethylene-based polymer wax (C): 1 part by mass of ethylene-based polymer wax similar to Example 3.

<Example 8>
A spunbonded non-woven fabric was obtained in the same manner as in Example 3 except that the following propylene-based polymer composition was used. Then, in the same manner as in Example 3, a hydrophilic agent was attached to the spunbonded nonwoven fabric. Table 1 shows the physical properties of the obtained hydrophilic non-woven fabric.

(Propylene-based polymer composition)
Propylene-based polymer (A): 100 parts by mass of propylene homopolymer (PP1) similar to Example 1 Ethylene-based polymer (B): 8 parts by mass of polyethylene similar to Example 1 Ethylene-based polymer wax (C) : 1 part by mass of ethylene polymer wax similar to Example 3.

<Example 9>
First, a spunbonded non-woven fabric was obtained in the same manner as in Example 3. Next, each component was dissolved in an aqueous solution so as to have the following blending ratio to obtain an aqueous solution of the hydrophilic agent B having a total amount of the active ingredient of 5% by mass. Next, the obtained spunbonded non-woven fabric was immersed in an aqueous solution of the following hydrophilizing agent B (active ingredient 5% by mass), squeezed, and then dried in a drying oven at 100 ° C. to obtain a hydrophilized nonwoven fabric. When the mass of the hydrophilizing agent adhering to the obtained hydrophilic non-woven fabric was measured according to the measurement of the coating amount, the coating amount was 0.5% by mass. Table 1 shows the physical properties of the obtained hydrophilic non-woven fabric.

(Hydrophilic agent B)
Di (2-ethylhexyl) Na sulfosuccinate: 20% by mass
Glycerin oleic acid diester / glycerin oleic acid triester = 5: 5 (mass ratio): 50% by mass
Polyoxyethylene oleic acid monoester (10 mol adduct of EO chain) / Polyoxyethylene oleic acid diester (10 mol adduct of EO chain) = 6: 4 (mass ratio): 30 mass%
The above-mentioned compounding ratio (% by mass) is the ratio of each component to the total mass of the active ingredient in the hydrophilic agent B, that is, in the aqueous solution of the hydrophilic agent B.

<Example 10>
A hydrophilic non-woven fabric was obtained in the same manner as in Example 9, except that an aqueous solution of the hydrophilizing agent B having a total amount of the active ingredient of 10% by mass was prepared and applied so that the coating amount was 1% by mass.

<Example 11>
First, a spunbonded non-woven fabric was obtained in the same manner as in Example 3. Next, each component was dissolved in an aqueous solution so as to have the following blending ratio to obtain an aqueous solution of the hydrophilic agent C having a total amount of the active ingredient of 10% by mass. Next, the obtained spunbonded non-woven fabric was immersed in an aqueous solution of the following hydrophilizing agent C (active ingredient 10% by mass), squeezed, and then dried in a drying oven at 100 ° C. to obtain a hydrophilized nonwoven fabric. When the mass of the hydrophilizing agent adhering to the obtained hydrophilic non-woven fabric was measured according to the measurement of the coating amount, the coating amount was 0.5% by mass. Table 1 shows the physical properties of the obtained hydrophilic non-woven fabric.

(Hydrophilic agent C)
Di (2-ethylhexyl) Na sulfosuccinate: 20% by mass
Sorbitan lauric acid monoester / sorbitan lauric acid diester / sorbitan lauric acid triester = 2: 3: 5 (mass ratio): 20% by mass
Polyoxyethylene lauric acid monoester (8 mol adduct of EO chain) / Polyoxyethylene lauric acid diester (8 mol adduct of EO chain) = 4: 6 (mass ratio): 30% by mass
Polyoxyethylene sorbitan oleic acid monoester (8 mol additive of EO chain) / Polyoxyethylene sorbitan oleic acid diester (8 mol additive of EO chain) / Polyoxyethylene sorbitan oleic acid triester (8 mol additive of EO chain) = 1: 6: 3 (mass ratio): 30% by mass
The above-mentioned compounding ratio (% by mass) is the ratio of each component to the total mass of the active ingredient in the hydrophilic agent C, that is, in the aqueous solution of the hydrophilic agent C.

<Comparative example 1>
A hydrophilic non-woven fabric was obtained in the same manner as in Example 1 except that an aqueous solution of the hydrophilizing agent A having a total amount of the active ingredient of 10% by mass was prepared and applied so that the coating amount was 1.1% by mass.

<Comparative example 2>
A hydrophilic non-woven fabric was obtained in the same manner as in Example 3 except that an aqueous solution of the hydrophilizing agent C having a total amount of the active ingredient of 10% by mass was prepared and applied so that the coating amount was 1.0% by mass.

<Comparative example 3>
First, a spunbonded non-woven fabric was obtained in the same manner as in Example 3. Next, each component was dissolved in an aqueous solution so as to have the following blending ratio to obtain an aqueous solution of the hydrophilic agent D having a total amount of the active ingredient of 5% by mass. Next, the obtained spunbonded non-woven fabric was dipped in an aqueous solution of the following hydrophilizing agent D (active ingredient 5% by mass), squeezed, and then dried in a drying oven at 100 ° C. to obtain a hydrophilized nonwoven fabric. When the mass of the hydrophilizing agent adhering to the obtained hydrophilic non-woven fabric was measured according to the measurement of the coating amount, the coating amount was 0.6% by mass. Table 1 shows the physical properties of the obtained hydrophilic non-woven fabric.

(Hydrophilic agent D)
Glycerin oleic acid diester: 30% by mass
Polyoxyethylene glycerin lauric acid diester / polyoxyethylene glycerin lauric acid triester = 4: 6 (mass ratio) (EO chain 8 mol adduct): 30% by mass
Polyoxyethylene lauric acid diester (8 mol adduct of EO chain): 40% by mass
The above-mentioned compounding ratio (% by mass) is the ratio of each component to the total mass of the active ingredient in the hydrophilizing agent D, that is, in the aqueous solution of the hydrophilizing agent D.

<Comparative example 4>
A hydrophilic non-woven fabric was obtained in the same manner as in Example 1 except that an aqueous solution of the hydrophilizing agent A having a total amount of the active ingredient of 2% by mass was prepared and applied so that the coating amount was 0.15% by mass.

Based on the above results, a nitrogen adsorption test obtained by the BET formula of a nitrogen adsorption isotherm containing a thermoplastic polymer fiber, a penetrant containing at least one of a sulfonate and a sulfate ester salt, and a wetting agent. The non-woven fabric in which the ratio of the surface water vapor adsorption area (surface water adsorption area / surface nitrogen adsorption area) in the water vapor adsorption test obtained by the BET formula of the water vapor adsorption isotherm to the surface nitrogen adsorption area is 2.0 to 5.8. It can be seen that the hydrophilicity is excellent and the transfer of the hydrophilic agent when it comes into contact with other members is suppressed.

Claims (17)

Thermoplastic polymer fibers and
With a penetrant containing at least one of a sulfonate and a sulfate ester
Wetting agent and
The ratio of the surface water vapor adsorption area in the water vapor adsorption test obtained by the water vapor adsorption isotherm BET formula to the surface nitrogen adsorption area in the nitrogen adsorption test obtained by the BET formula of the nitrogen adsorption isotherm (surface water vapor adsorption area / surface). A non-woven fabric having a nitrogen adsorption area) of 2.0 to 5.8. In water vapor adsorption tests obtained by BET equation vapor adsorption isotherm, surface water vapor adsorption area ^is 0.4m ² /g~1.2m 2 / g, nonwoven fabric according to claim 1. The nonwoven fabric according to claim 1 or 2, wherein the sulfonate is an alkyl sulfosuccinate. The non-woven fabric according to any one of claims 1 to 3, wherein the ratio of the penetrant to the wetting agent (penetrating agent / wetting agent) is 1/99 to 60/40 in terms of mass ratio. 1. The fiber has a propylene-based polymer composition containing 100 parts by mass of a propylene-based polymer (A) having a melting point of 130 ° C. or higher and 1 part by mass to 10 parts by mass of an ethylene-based polymer (B). The non-woven fabric according to any one of claims 4. The nonwoven fabric according to claim 5, wherein the ethylene-based polymer (B) has a density of 0.930 g / cm ^{3 to} 0.980 g / cm ³ . The nonwoven fabric according to claim 5 or 6, wherein the propylene-based polymer composition further contains an ethylene-based polymer wax (C) having a weight average molecular weight (Mw) of 400 to 30,000. The density of the ethylene polymer wax (C) ^is a ^{0.890g / cm 3 ~0.980g / cm 3} , the nonwoven fabric of claim 7. The invention according to any one of claims 5 to 8, wherein the propylene-based polymer composition contains the propylene-based polymer (D) shown in the following (III) in an amount of more than 0 parts by mass and 25 parts by mass or less. Non-woven fabric.
(III) Propylene homopolymer having a melting point of less than 120 ° C. satisfying the following (a) to (f) (a) [mmmm] = 20 mol% to 60 mol%
(B) [rrrr] / (1- [mmmm]) ≦ 0.1
(C) [rmrm]> 2.5 mol%
(D) [mm] × [rr] / [mr] 2 ≦ 2.0
(E) Weight average molecular weight (Mw) = 10,000 to 200,000
(F) Molecular weight distribution (Mw / Mn) <4
In (a) to (d), [mmmm] is a racemic pentad fraction, [rrrr] is a racemic pentad fraction, and [rmrm] is a racemic mesolacemic mesopentad fraction, [m.
m], [rr] and [mr] are triad fractions, respectively. The non-woven fabric according to any one of claims 1 to 9, wherein the average fiber diameter is 5 μm to 25 μm. For the penetrant and the wetting agent, 0.02 g of the penetrant and the wetting agent were added to 20 ml of a 1/1 mixed solution of hexane / water in a mass ratio, and the penetrant and the wetting agent were added. The non-woven fabric according to any one of claims 1 to 10, wherein the added mixed solution is stirred and the oil phase and the aqueous phase are separated after 1 minute. Any one of claims 1 to 11, wherein the wetting agent comprises at least one selected from the group consisting of polyhydric alcohol fatty acid esters, polyoxyalkylene fatty acid esters, and alkylene oxide adducts of polyhydric alcohol fatty acid esters. The non-woven fabric according to the section. The non-woven fabric according to any one of claims 1 to 12, which is a spunbonded non-woven fabric. A covering sheet containing the non-woven fabric according to any one of claims 1 to 13. A laminate comprising the non-woven fabric according to any one of claims 1 to 13. A covering sheet containing the laminate according to claim 15. The process of preparing the non-woven fabric containing the fibers of the thermoplastic polymer,
A step of attaching a penetrant containing at least one of a sulfonate and a sulfate ester salt and a wetting agent to the non-woven fabric.
Have,
Ratio of surface water vapor adsorption area in the water vapor adsorption test obtained by the water vapor adsorption isotherm BET formula to the surface nitrogen adsorption area in the nitrogen adsorption test obtained by the BET formula of the nitrogen adsorption isotherm (surface water vapor adsorption area / surface nitrogen adsorption area) However, the method for producing a non-woven fabric is 2.0 to 5.8.