WO2021251213A1 - Non-woven fabric, liquid-impregnated sheet, and wiping sheet - Google Patents

Abstract

The present invention proves a non-woven fabric, and a liquid-impregnated sheet and wiping sheet which use the non-woven fabric. The non-woven fabric contains phosphorus-modified polyester-based fibers that have a modified part modified by a phosphorus compound, wherein: the basis weight is not more than 150 g/m²; and the phosphorus-modified polyester-based fibers are tangled with each other by three-dimensional entanglement in at least the thickness direction. The non-woven fabric may further include cellulose-based fibers and/or adhesion core-sheath composite fibers.

Description

Non-woven fabric, liquid impregnated sheet and wipe sheet Related application

This application claims the priority of Japanese Patent Application No. 2020-099988 filed in Japan on June 9, 2020, and the whole of this application is cited as a part of this application by reference.

The present invention relates to a non-woven fabric, a liquid impregnated sheet and a wiping sheet.

Polyester fiber has high strength characteristics and is widely used as clothing fiber. However, the high strength characteristics of polyester fibers may cause unintended problems such as pilling when used as fibers. For example, in Patent Document 1 (Japanese Unexamined Patent Publication No. 61-47818), in order to suppress the occurrence of pilling in the polyester fiber, the polyester fiber into which the phosphoric acid ester has been introduced is partially treated with hot water. It has been described that hydrolysis is obtained to obtain polyester fibers having excellent anti-pill properties.

Further, in Patent Document 2 (Japanese Unexamined Patent Publication No. 2003-155334), a modified polyester resin suitable for copolymerizing a phosphorus compound to obtain a fiber structure having good flexibility, and a modified polyester resin thereof are used. Polyester fibers and polyester non-woven fabrics are disclosed, and it is described that the obtained non-woven fabrics can be suitably used for applications requiring flexibility such as interlining non-woven fabrics.

Japanese Unexamined Patent Publication No. 61-47818 Japanese Unexamined Patent Publication No. 2003-155334

However, Patent Document 1 does not describe the use of the fiber as a non-woven fabric, and the hydrolyzed portion of the fiber whose anti-pill property has been improved by hot water treatment not only causes fluffing. Since the strength of the fiber itself is reduced, the restoring force after the non-woven fabric is deformed by compression cannot be expected.
Further, in Patent Document 2, the main purpose is to use it as a nonwoven fabric for interlining, and since the nonwoven fabric is formed by processing with a needle punch or an embossed roll, the nonwoven fabric has low deformability when the nonwoven fabric is compressed.

Therefore, an object of the present invention is to provide a non-woven fabric having excellent cushioning properties in the thickness direction, and a liquid impregnated sheet and a wiping sheet using the non-woven fabric.

Another object of the present invention is to provide a nonwoven fabric having excellent compression change rate and compression recovery rate, particularly a nonwoven fabric having excellent compression change rate and compression recovery rate at the time of liquid impregnation, and a liquid impregnated sheet and a wiping sheet using the same. It is in.

As a result of diligent studies to achieve the above object, the inventors of the present invention have found that in the phosphorus-modified polyester fiber modified with a phosphorus compound, the modified portion acts as a bending point in the fiber. Then, in order to make the best use of the bending points generated in the fibers, if the phosphorus-modified polyester fibers are entangled with each other by three-dimensional entanglement at least in the thickness direction at a specific texture, the fibers are greatly entangled during compression in the thickness direction of the non-woven fabric. Not only is it possible to sink, but the strength of the polyester fiber is used for good compression recovery, and surprisingly, this fiber makes use of the rate of change in compression and compression, especially during liquid impregnation. The present invention has been completed by finding that the compression recovery rate can be improved.

That is, the present invention can be configured in the following aspects.
[Aspect 1]
It contains a phosphorus-modified polyester fiber having a modified site modified by a phosphorus compound, and has a texture of 150 g / m ² or less (preferably in the range of 10 to 130 g / m ² and more preferably 20 to 100 g). / M ² ), which is a non-woven fabric in which the phosphorus-modified polyester fibers are entangled with each other by three-dimensional entanglement in the thickness direction.
[Aspect 2]
The non-woven fabric according to the first aspect, further containing cellulosic fibers, in which the phosphorus-modified polyester fibers and the cellulosic fibers are entangled with each other by three-dimensional entanglement in the thickness direction.
[Aspect 3]
The nonwoven fabric according to aspect 2, wherein the mass ratio of the cellulosic fiber to the phosphorus-modified polyester fiber is (former / latter) = 95/5 to 10/90 (preferably 95/5 to 30/70, A non-woven fabric which is more preferably 95/5 to 50/50).
[Aspect 4]
The nonwoven fabric according to any one of aspects 1 to 3, further containing an interlining sheath type fiber, and at least the phosphorus-modified polyester fiber and the interlining sheath type fiber are three-dimensionally entangled in the thickness direction. Non-woven fabric that is entwined between fibers.
[Aspect 5]
The nonwoven fabric according to the fourth aspect, wherein the mass ratio of the interlining sheath type composite fiber and the phosphorus-modified polyester fiber is (the former / the latter) = 70/30 to 5/95 (preferably 65/35 to 8). / 92, more preferably 60/40 to 10/90).
[Aspect 6]
The nonwoven fabric according to any one of aspects 1 to 5, wherein the polyester fiber has a phosphorus modification rate of 0 as the ratio of the phosphoric acid atom to the total acid component in the polyester polymer forming the fiber. A non-woven fabric of 5 to 5 mol% (preferably 0.6 to 3.0 mol%, more preferably 0.7 to 2.5 mol%).
[Aspect 7]
The nonwoven fabric according to any one of aspects 1 to 6, which has a spunlace structure.
[Aspect 8]
The nonwoven fabric according to any one of aspects 1 to 7, having a compression change rate of 18.0% or more (preferably 19.5% or more, more preferably 21.0% or more, particularly preferably 21.0% or more) when wet. Non-woven fabric that is 25.0% or more).
[Aspect 9]
The nonwoven fabric according to any one of aspects 1 to 8, wherein the compression recovery rate at the time of wetting is 7.0% or more (preferably 8.0% or more, more preferably 11.5% or more). ..
[Aspect 10]
The nonwoven fabric according to any one of aspects 1 to 9, wherein the non-woven fabric and the bioskin (artificial skin) at the time of drying have a static friction coefficient of 0.060 or less (preferably 0.058 or less, more preferably 0). .055 or less) non-woven fabric.
[Aspect 11]
The nonwoven fabric according to any one of aspects 1 to 10, which is to be applied to the human body.
[Aspect 12]
A liquid impregnated sheet using the nonwoven fabric according to any one of aspects 1 to 11.
[Aspect 13]
A wipe sheet using the non-woven fabric according to any one of aspects 1 to 11.

It should be noted that any combination of at least two components disclosed in the claims and / or the specification and / or the drawings is included in the present invention. In particular, any combination of two or more of the claims described in the claims is included in the invention.

In the present invention, it is possible to provide a nonwoven fabric having excellent cushioning properties in the thickness direction. Further, when this nonwoven fabric is impregnated with a liquid, it can have good deformability when compressed in the thickness direction. Further, when the load in the thickness direction is weakened, the thickness can be increased again at the time of liquid impregnation to have good recovery. Furthermore, the nonwoven fabric of the present invention can also suppress the generation of fluff.

The present invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings. However, the examples and drawings are for illustration and illustration purposes only and should not be used to define the scope of the invention. The scope of the invention is determined by the appended claims.
It is a schematic diagram for demonstrating the method of measuring a compression recovery rate and a compression deformation rate. FIG. 3 is a schematic plan view showing a sample cut out from a nonwoven fabric used for measuring the coefficient of static friction between a liquid-impregnated nonwoven fabric and a bioskin plate. FIG. 3 is a schematic plan view for explaining the state of a sample used when measuring the coefficient of static friction between a liquid-impregnated nonwoven fabric and a bioskin plate. It is a schematic side view for demonstrating the test apparatus used when measuring the coefficient of static friction between a liquid impregnated nonwoven fabric and a bioskin plate. It is a schematic diagram for demonstrating the state which holds a sample by hand when performing a sensory test.

The nonwoven fabric of the present invention is a nonwoven fabric containing a phosphorus-modified polyester fiber having a modified portion modified by a phosphorus compound, has a grain ^{size of 150 g / m 2} or less, and the phosphorus-modified polyester fiber has at least the thickness direction. It is a non-woven fabric in which fibers are entangled by three-dimensional entanglement.

(Phosphorus-modified polyester fiber)
The phosphorus-modified polyester fiber is a fiber obtained by melt-spinning a modified polyester polymer modified by adding a phosphorus compound in a polyester polymer whose main repeating unit is ethylene terephthalate.

The polyester polymer whose main repeating unit is ethylene terephthalate has a dicarboxylic acid mainly composed of terephthalic acid or a lower alkyl ester derivative thereof as a terephthalic acid unit, and a glycol mainly composed of ethylene glycol or an ethylene glycol unit. Has as.

The polyester polymer may be less than 30 mol%, preferably less than 10 mol%, as other dicarboxylic acid units and / or diol units based on all the constituent units, as long as the effects of the present invention are not impaired. It may contain structural units derived from other bifunctional compounds.

Structural units derived from such other bifunctional compounds include aromatic dicarboxylic acids such as isophthalic acid, phthalic acid, naphthalenedicarboxylic acid, biphenyldicarboxylic acid, diphenyletherdicarboxylic acid, diphenylsulfonicdicarboxylic acid, and diphenylketonedicarboxylic acid. Acids; aliphatic dicarboxylic acids such as malonic acid, succinic acid, adipic acid, azelaic acid, and sebacic acid; alicyclic dicarboxylic acids such as decalindicarboxylic acid and cyclohexanedicarboxylic acid; glycolic acid, hydroxyacrylic acid, hydroxypropionic acid, asiatin. Hydroxycarboxylic acids such as acids, quinovaic acid, hydroxybenzoic acid, mandelic acid, matrolactic acid; aliphatic lactones such as ε-caprolactone; trimethylene glycol, tetramethylene glycol, 1,5-pentanediol, 1,6-hexane An aliphatic diol such as diol, neopentyl glycol, diethylene glycol, polyethylene glycol; aromatic diol such as hydroquinone, catechol, naphthalene diol, resorcin, bisphenol A, bisphenol S; bifunctionality such as alicyclic diol such as cyclohexanedimethanol The structural units derived from the components can be mentioned. These structural units may be used alone or in combination of two or more.

The polyester polymer used in the present invention is copolymerized with a phosphorus compound, and the copolymerized portion with the phosphorus compound imparts flexibility to the fiber. The phosphorus compound is not particularly limited as long as it can be copolymerized with the polyester polymer, and for example, (A) an inorganic phosphorus compound such as red phosphorus, yellow phosphorus, phosphorus trichloride, phosphorus pentachloride, phosphorus pentoxide, etc. B) Inorganic acids such as phosphoric acid, phosphoric acid, and polyphosphoric acid and their salts, (C) aliphatic or aromatic esters of phosphoric acid (including partial esters), (D) aliphatic or aromatic phosphoric acid. Group esters (including partial esters) and the like can be mentioned. These phosphorus compounds may be used alone or in combination of two or more. The amount of the phosphorus compound modified in the polyester polymer may be, for example, 0.5 to 5 mol%, preferably 0, as the ratio of the phosphoric acid atom to the total acid component in the polyester polymer. It may be 0.6 to 3.0 mol%, more preferably 0.7 to 2.5 mol%.

Of these phosphorus compounds, the phosphoric acid dialkyl ester represented by the following formula (I) is preferably used.

(In the formula, R ¹ and R ² each independently represent a linear or branched alkyl group having 3 to 8 carbon atoms).

In formula (I), the alkyl groups R ¹ and R ² may be branched chain alkyl groups, but are preferably straight chain alkyl groups. Preferred phosphate dialkyl esters include di-n-propyl phosphate, di-n-butyl phosphate, di-t-butyl phosphate, di-n-pentyl phosphate, di-n-hexyl phosphate, and di-n-heptyl phosphate. Di-n-octyl phosphate, (n-propyl) (n-butyl) phosphate, (n-propyl) (n-pentyl) phosphate, (n-propyl) (n-hexyl) phosphate, (n-propyl) (n) -Heptyl) phosphate, (n-propyl) (n-octyl) phosphate, (n-butyl) (n-pentyl) phosphate, (n-butyl) (n-hexyl) phosphate, (n-butyl) (n-heptyl) ) Phosphate, (n-butyl) (n-octyl) phosphate, (n-pentyl) (n-hexyl) phosphate, (n-pentyl) (n-heptyl) phosphate, (n-pentyl) (n-octyl) Phosphate, (n-hexyl) (n-heptyl) phosphate, (n-hexyl) (n-octyl) phosphate, (n-heptyl) (n-octyl) phosphate and the like can be mentioned, and more preferably di-n-butyl. Butyl.

After melt-kneading the phosphorus-modified polyester polymer by a usual method, a phosphorus-modified polyester fiber can be obtained by using a melt spinning device. In the obtained phosphorus-modified polyester fiber, since the hot water treatment is not performed, the copolymerized portion by the phosphorus compound is not hydrolyzed and exists as a flexible portion in the fiber.

The fineness of the phosphorus-modified polyester fiber is not particularly limited, but may be, for example, 0.5 to 10.0 dtex, preferably 1.2 to 2.2 dtex, and more preferably 1. It may be .5-1.9 dtex. The average fiber length of the phosphorus-modified polyester fiber is not particularly limited, but may be, for example, 10 to 100 mm, preferably 20 to 80 mm, from the viewpoint of manufacturing workability, mechanical properties of the nonwoven fabric, and the like. It may be preferably 30 to 60 mm.

The nonwoven fabric of the present invention may be composed of at least phosphorus-modified polyester fibers, but may contain other fibers. As the fiber contained in addition to the phosphorus-modified polyester fiber, for example, a cellulosic fiber may be contained from the viewpoint of improving water retention, and an interlining sheath type composite fiber is included from the viewpoint of improving the integrity of the nonwoven fabric. You may go out.

For example, the non-woven fabric of the present invention may be a non-woven fabric in which (i) phosphorus-modified polyester fibers and cellulose-based fibers are entangled between fibers by at least three-dimensional entanglement in the thickness direction, and (ii) phosphorus-modified polyester. The fibers and the adhesive core sheath type composite fibers may be a non-woven fabric in which the fibers are entangled with each other by three-dimensional entanglement at least in the thickness direction, or (iii) phosphorus-modified polyester fibers, cellulose fibers and the adhesive core sheath. It may be a non-woven fabric in which the type fibers are entangled between the fibers by at least three-dimensional entanglement in the thickness direction.

(Cellulose fiber)
Examples of cellulosic fibers include vegetable fibers such as cotton, hemp and pulp, regenerated fibers such as rayon and cupra, and purified cellulose fibers such as lyocell (Tencel). These cellulosic fibers may be used alone or in combination of two or more. Of these, rayon is preferable because of its easy availability and handling. Further, the cellulosic fiber may be partially fibrillated, but it is desirable that the cellulosic fiber is not substantially fibrillated from the viewpoint of handleability.

The fineness of the cellulosic fiber is not particularly limited, but may be, for example, 0.5 to 10.0 dtex, preferably 1.2 to 2.2 dtex, and more preferably 1. It may be 5 to 1.9 dtex. The average fiber length of the cellulosic fiber is not particularly limited, but may be, for example, 10 to 100 mm, more preferably 20 to 80 mm, more preferably 20 to 80 mm, for example, from the viewpoint of manufacturing workability, mechanical properties of the nonwoven fabric, and the like. May be 30 to 60 mm.

The mass ratio (former / latter) of the cellulosic fiber and the phosphorus-modified polyester fiber can be selected from a wide range, and may be, for example, 95/5 to 10/90. In the present invention, the inclusion of the phosphorus-modified polyester fiber makes it possible to improve the elasticity at the time of wetting, which cannot be obtained only with the cellulosic fiber. The mass ratio (the former / the latter) of the cellulosic fiber to the phosphorus-modified polyester fiber may be preferably 95/5 to 30/70, more preferably 95/5 to 50/50.

(Interlining sheath type composite fiber)
The interlining sheath type composite fiber is composed of a resin component forming a core portion and a resin component forming a sheath portion, and the sheath portion has adhesiveness. Various resin components can be used for the sheath portion as long as the adhesive portion can be formed, but from the viewpoint of workability, the sheath portion preferably has heat-sealing properties. Preferred sheaths include heat-fusible polyethylene and polypropylene, polyolefin resins such as modified polymers, blends and copolymers thereof, and modified polyester resins other than phosphorus-modified polyester (for example, modified with isophthalic acid). (Polyethylene terephthalate) and the like, preferably polyethylene and a modified polymer of polyethylene, a blend, a copolymer, a modified polyethylene terephthalate and the like.
For example, when a heat-sealing resin is used as the sheath portion, the melting point of the heat-sealing resin may be, for example, 80 to 150 ° C., preferably 100 to 140 ° C.

On the other hand, the core portion can be made into a fiber with the sheath portion forming the adhesive portion, and is not particularly limited as long as the use as a fiber can be maintained even when the sheath portion forms the adhesive portion, depending on the sheath portion. Suitable resin components are selected. Preferred cores include, for example, polyolefin-based resins such as polypropylene and polyester-based resins such as polyethylene terephthalate. When a heat-sealing resin is used as the sheath portion, the melting point of the resin component of the core portion may be, for example, 10 ° C. or higher, preferably 20 ° C. or higher, more preferably 20 ° C. or higher, as compared with the melting point of the sheath portion resin component. The temperature may be higher than 30 ° C.

For example, as the core / sheath combination, a combination of polyethylene terephthalate / polyethylene, polyethylene terephthalate / modified polyethylene terephthalate, polypropylene / polyethylene, polypropylene / modified polypropylene and the like is suitable. Of these, a polypropylene / polyethylene combination, which is inexpensive and is generally used for non-woven fabrics, is preferable.

From the viewpoint of forming a strong adhesive portion, it is preferable that the low melting point component to be the interlining covers at least 40% or more, particularly 60% or more around the core portion in the interlining sheath type composite fiber. The composition ratio of the core portion and the sheath portion may be, for example, 90/10 to 10/90, preferably 80/20 to 20/80, and more preferably 70/30 to 30/90 in terms of mass ratio. It may be 70.

The cross-sectional shape of the adhesive interlining sheath type composite fiber is not particularly limited and may be any form such as a round interlining sheath, an eccentric interlining sheath, and a modified cross-sectional core sheath. From the viewpoint of improving morphological stability, the fineness of the interlining sheath type composite fiber may be, for example, 0.5 to 10.0 dtex, preferably 1.0 to 5.0 dtex, and more preferably 1.4. It may be ~ 2.2 dtex. The average fiber length of the interlining sheath type composite fiber is preferably in the range of, for example, 10 mm to 80 mm from the viewpoint of manufacturing workability, mechanical properties of the non-woven fabric, and the like. It is more preferably 30 mm to 70 mm, and even more preferably 35 mm to 60 mm. By using such short fibers in the interlining-sheath type composite fiber, it is possible to improve the mechanical properties such as the strength and elongation of the nonwoven fabric while increasing the mobility and the degree of entanglement of the fibers by the entanglement treatment.

The mass ratio (former / latter) of the interlining-sheath type composite fiber and the phosphorus-modified polyester fiber can be appropriately set depending on the presence or absence of the cellulose fiber, and is, for example, 70/30 to 5/95. May be. In particular, since the interlining-sheath type composite fiber can impart good integrity to the nonwoven fabric in combination with the phosphorus-modified polyester fiber having flexibility, the interlining-sheath type composite fiber and the phosphorus-modified polyester fiber can be combined. The mass ratio (former / latter) may be preferably 65/35 to 8/92, more preferably 60/40 to 10/90.

The content of the interlining sheath type composite fiber may be preferably 7% by mass or more and 17% by mass or less, and more preferably 8% by mass or more and 15% by mass or less.

The nonwoven fabric of the present invention may further contain fibers other than phosphorus-modified polyester fibers, cellulosic fibers, and interlining-sheath-type composite fibers as long as the effects of the present invention are not impaired. Examples of such fibers include polyester fibers (excluding phosphorus-modified polyester fibers), polyolefin fibers, polyamide fibers, acrylic fibers, polyvinyl alcohol fibers and the like.
The non-woven fabric of one embodiment further contains various additives such as flame retardants, hydrophilic agents, water repellents, colorants (pigments, etc.), antibacterial agents, antifungal agents, deodorants, oil components, fragrances, and adhesives. It may be included.

[Manufacturing method of non-woven fabric]
The non-woven fabric is obtained by forming a web by a dry method using the various fibers described above from the viewpoint of mixing the fibers and securing a space for impregnating the liquid, and then entwining the fibers in the web by an entanglement treatment. Can be done. Further, when the interlining-sheath type composite fiber is provided, an adhesive portion may be formed on the interlining-sheath type composite fiber by an adhesive treatment, if necessary.

Specifically, the phosphorus-modified polyester fiber and, if necessary, other fibers are mixed and then defibrated by carding with a card machine to prepare a web. Such a web may be a parallel web in which fibers are arranged in the traveling direction of the card machine, a cross web in which parallel webs are cross-laid, a random web in which the parallel webs are randomly arranged, or a semi-random web in which the fibers are arranged in a moderate manner. However, a random web is preferable in consideration of the fact that the sheet is easy to fit in all directions when used, and a semi-random web is preferable in consideration of high productivity.

In the entanglement treatment, at least a part of the fibers spreading in the plane direction are entangled at least in the thickness direction to entangle the fibers in three dimensions, and the fibers are mechanically bonded to each other to be integrated as a non-woven fabric. Here, mechanical bonding means physically entwining, and does not include bonding by adhesion.
Therefore, the entanglement treatment is not particularly limited as long as it is a mechanical bonding method used in the method for bonding a non-woven fabric web, but water flow entanglement is performed on the obtained web from the viewpoint of enabling fine entanglement between fibers. Is preferable. In the water flow entanglement treatment, for example, a web placed on a porous support member described later is made to collide with a water flow jetted in a columnar shape at a high pressure, and the constituent fibers of the web are closely three-dimensionally entangled and integrated. To make it. The non-woven fabric obtained by water flow confounding has a spunlace structure.

When three-dimensional entanglement is applied to the web, a method in which the web is placed on a moving porous support member and treated once or multiple times with a water flow having a water pressure of 0.5 to 15 MPa is preferably mentioned. It is preferable that the injection holes are arranged in a row of nozzle plates in a direction orthogonal to the traveling direction of the web so that the water flow uniformly collides with the web. In order to improve the uniformity of the thickness of the web, the water pressure should be in the range of 1.5 to 12 MPa, and the water flow entanglement treatment should be performed at least twice for each of both sides of the web, and at least 5 times in total. It is preferable to do so. From the viewpoint of making the entanglement with the web uniform, the distance between the injection hole and the web is preferably 1 to 10 cm. Further, the water flow may be injected from, for example, a nozzle plate in which injection holes having a hole diameter of 0.05 to 0.10 mm and an interval of 0.30 to 1.50 mm are arranged in one or two rows.

As the porous support member on which the web is placed, for example, a mesh screen made of metal or resin, a perforated plate, or the like is used. From the viewpoint of enhancing the flatness of the surface of the non-woven fabric, it is preferable to perform water flow entanglement on a woven structure of fine fibers (for example, a plain weave structure) at least in the final treatment of the water flow entanglement treatment.

Further, in order to improve the surface flatness of the web, among the nozzle plates used in the water flow entanglement treatment on the porous support member, the nozzle plate used in the final stage has a pore diameter of 0.05 to 0.10 mm. It is preferable that the injection holes having an interval of 0.30 to 1.00 mm are arranged in one or two rows.
The obtained non-woven fabric can be used after being dried by a conventional method, if necessary.
<Adhesion process>
When the interlining sheath type composite fiber is provided, a fiber bonding step may be further performed. In this bonding step, the bonded portion can be formed between the interlining-sheath type composite fibers while maintaining the entangled structure. The bonding step can be appropriately selected according to the resin component used in the bonding portion between the bonding core-sheath type composite fibers. For example, the bonding portion under a solvent in which only the sheath portion of the bonding core-sheath type composite fiber is softened. Or a heat-sealed core sheath type composite fiber may be used to melt the sheath portion by heat treatment to form an adhesive portion. From the viewpoint of convenience, the bonding process by heat treatment is preferable.

When heat treatment is performed, the temperature and the like are not particularly limited as long as the temperature and the like can be controlled so as not to form the adhesive portion in the non-adhesive interlining sheath type composite fiber while forming the adhesive portion with respect to the adhesive interlining sheath type composite fiber, and hot air drying is performed. It is possible to use various dryers such as machines and cylinder dryers. In the heat treatment step, the amount of heat may be adjusted so that the temperature of the web becomes higher than the melting point of the sheath portion of the interlining sheath type composite fiber contained in the web.

In the case of a heat-sealed core-sheath type composite fiber, a cooling step may be further performed to fix the bonded portion. In the cooling step, cooling may be performed by releasing heat from the web by appropriately adjusting the time until winding after the heat treatment step, or cooling may be performed by using a cooling means. In order to fix the bonded portion and improve the morphological stability of the web and the prevention of fluffing, it is preferable to wind the web after the temperature of the web becomes equal to or lower than the melting point temperature of the sheath portion of the heat-sealed core sheath type composite fiber. ..

[Non-woven fabric]
The nonwoven fabric of the present invention has a texture of 150 g / m ² or less, and phosphorus-modified polyester fibers are entangled with each other by three-dimensional entanglement at least in the thickness direction, so that when compressed in the thickness direction of the nonwoven fabric. In addition, not only can it be greatly deformed, but also the compression recovery rate after being deformed can be increased.

(Metsuke)
The basis weight of the nonwoven fabric may be preferably in ^{the range of 10 to 130 g / m 2} , and more preferably in the range of 20 to 100 g / m ^2. Further, when the interlining sheath type composite fiber is provided, the basis weight of the nonwoven fabric may be preferably in ^{the range of 10 to 80 g / m 2} , and more preferably in the range of 20 to 60 g / m ^2. good.

(thickness)
The thickness of the nonwoven fabric is not particularly limited, but may be, for example, in the range of 0.05 to 10 mm, preferably in the range of 0.10 to 8 mm, and more preferably in the range of 0.20 to 5 mm. May be good. If the thickness is too thin, it tends to be difficult to maintain the shape of the non-woven fabric, and if the thickness is too thick, the sheet-like fiber aggregate becomes too thick and the entanglement between the fibers is insufficient. Tends to be.

(Apparent density)
The apparent density of the nonwoven fabric may be, for example, in ^{the range of 0.04 to 0.20 g / cm 3} , preferably in the range of 0.06 to 0.15 g / cm ^3. Here, the apparent density is a value obtained by dividing the basis weight of the nonwoven fabric by the thickness. If the apparent density of the nonwoven fabric is too low, the morphological stability tends to decrease, and if the apparent density of the nonwoven fabric is too high, the liquid retention amount tends to decrease. The apparent density of the non-woven fabric constituting the sheet of the present invention ^{can be calculated from the amount of grain (g / m 2} ) and the thickness (mm) (the apparent density of the non-woven fabric (g / cm ³ ) = the amount of grain (g / cm 3). g / m ² ) / thickness (mm) / 1000). The thickness of the nonwoven fabric is measured with reference to 6.2 of JIS L 1913 "General nonwoven fabric test method".

(Compression recovery rate under drying)
Since the nonwoven fabric of one embodiment has excellent recovery after being compressed and deformed under drying, the compression recovery rate represented by the following formula may be, for example, 3.0% or more, preferably 3.5. % Or more, more preferably 4.0% or more. The upper limit of the compression recovery rate is not particularly limited, but may be about 30%. Nonwoven fabric with a high compression recovery rate has excellent cushioning properties.
Compression recovery rate = (CB) / A × 100

Here, A is the thickness when 10 laminated non-woven fabrics are ^{measured under a load of 5 g / cm 2} , and B is the thickness of the non-woven fabric after measuring A under a load of ^{40 g / cm 2.} C is the measured thickness, and C is the thickness of the nonwoven fabric measured again under a load of ^{5 g / cm 2 after measuring B.} These thicknesses are values measured by the methods described in the examples described below.

FIG. 1 is a schematic diagram for explaining a method for measuring the compression recovery rate. As shown in FIG. 1, the compression recovery rate is even higher after measuring the thickness A by once applying a predetermined load X in the thickness direction to the nonwoven fabric laminate 20 in which 10 nonwoven fabrics 10 are stacked. A load Y is applied to the nonwoven fabric, and the thickness B of the nonwoven fabric laminate 20 is measured. Then, the original load X is returned and the thickness C of the nonwoven fabric laminate 20 is measured. By reducing the ratio of thickness B to thickness A from the ratio of thickness C to thickness A, the thickness of the non-woven fabric is determined by how much the thickness of the non-woven fabric recovers after a high load is applied. It can be generalized regardless.

(Compression change rate under drying)
Since the nonwoven fabric of one aspect is excellent in deformability when compressed under drying, the nonwoven fabric may have a compression change rate represented by the following formula of, for example, 10.0% or more, preferably 15.0%. As mentioned above, it may be more preferably 18.0% or more. The upper limit of the compression change rate is not particularly limited, but may be about 60%. Nonwoven fabrics with a high compression change rate are excellent in softness in the thickness direction.
Compression rate of change = (AB) / A × 100
Here, A and B are the same as the definitions in the compression recovery rate.

(Compression recovery rate under wet conditions)
The non-woven fabric of one aspect can not only be greatly deformed when compressed under wet conditions, but also has excellent recoverability after being deformed. The represented compression recovery rate may be, for example, 7.0% or more, preferably 8.0% or more, and more preferably 11.5% or more. The upper limit of the compression recovery rate is not particularly limited, but may be about 30%.
Compression recovery rate = (CB) / A × 100

Here, A, B and C are the same as the definitions in the compression recovery rate under drying.

When the compression recovery rate under wet conditions is high, the non-woven fabric can be greatly deformed under a higher load, but when the load is lowered again, the deformed shape can return to the original thickness. Therefore, the non-woven fabric can recover its thickness without losing its elasticity even after being subjected to a high load while containing a liquid, and such a non-woven fabric is compressed while containing the liquid. Elasticity can be maintained even after deformation.

(Compression change rate under wet conditions)
Since the nonwoven fabric of one embodiment is excellent in deformability when compressed under wet conditions, the nonwoven fabric has a compression change rate represented by the following formula, for example, in a state where a mixed solution of distilled water and glycerin is contained until saturation. It may be 0% or more, preferably 19.5% or more, more preferably 21.0% or more, and particularly preferably 25.0% or more. The upper limit of the compression change rate is not particularly limited, but may be about 60%.
Compression rate of change = (AB) / A × 100
Here, A is the thickness of 10 laminated non-woven fabrics ^{measured under a load of 5 g / cm 2} , and B is the thickness of the non-woven fabric measured under a load of ^{40 g / cm 2 after measuring A.} The thickness.

When a non-woven fabric having a high compression change rate under wet conditions is compressed with a predetermined force, the non-woven fabric is greatly compressed in the thickness direction while containing the liquid, so that the liquid contained in the non-woven fabric is satisfactorily released with the change. Is possible.

(Standing coefficient of friction between non-woven fabric and bioskin)
Since the nonwoven fabric of one embodiment preferably has smoothness when applied to the skin, for example, the coefficient of static friction (DRY) between the nonwoven fabric and the bioskin (artificial skin) in a dry state is, for example, 0. It may be 060 or less, preferably 0.058 or less, and more preferably 0.055 or less. The lower limit is not particularly limited, but may be, for example, about 0.020. The coefficient of static friction (DRY) between the nonwoven fabric and the bioskin (artificial skin) is a value measured by the method described in Examples described later.

Further, since the nonwoven fabric of one aspect preferably has smoothness when applied to the skin even in a wet state, for example, the coefficient of static friction (WET) between the nonwoven fabric and the bioskin (artificial skin) in the wet state. ) May be, for example, 0.045 or less, preferably 0.043 or less. The lower limit is not particularly limited, but may be, for example, about 0.020. The coefficient of static friction (WET) between the nonwoven fabric and the bioskin (artificial skin) is a value measured by the method described in Examples described later, and the nonwoven fabric is used in a state of containing 400% by mass of distilled water. ..

Since the non-woven fabric of one aspect has the same coefficient of static friction between the non-woven fabric and bioskin (artificial skin) between dry and wet, the difference in the coefficient of static friction between dry and wet (DRY-WET). ) May be, for example, 0.025 or less, preferably 0.018 or less, and more preferably 0.016 or less.

The non-woven fabric of one aspect can be suitably used in applications where softness and cushioning properties are required regardless of whether it is in a dry state or a wet state, and depending on the purpose, it can be used for cleaning, beauty, and medical use. , It can be suitably used in household use, industrial use and the like.

Further, a non-woven fabric capable of reducing irritation to the skin regardless of whether it is in a dry state or a wet state is suitably used in applications for application to the human body, particularly in applications in which it comes into direct contact with human skin. It is possible. Therefore, the non-woven fabric of the present invention is, for example, a cosmetic puff (cotton-like material), a beauty sheet such as a face mask base material, a clothing sheet for protecting the skin, and a top sheet for sanitary materials such as disposable diapers and sanitary napkins. It can be suitably used as such.

[Liquid impregnated sheet or non-woven fabric for liquid impregnation]
The present invention includes a liquid-impregnated sheet made by using the non-woven fabric, that is, a liquid-containing sheet in which a non-woven fabric is impregnated with a liquid. The liquid impregnated sheet can be suitably used in cleaning applications, beauty applications, medical applications, household applications, industrial applications and the like. The non-woven fabric of the present invention is distributed in a dry state and is used as a liquid-impregnated non-woven fabric (for example, a cosmetic puff (cotton-like material), a beauty sheet such as a face mask base material) which is used by impregnating a liquid during use. It may be used.

The liquid used according to these uses can be appropriately selected according to the use, and may be a solution, a dispersion, an emulsion or the like having a known or commonly used active ingredient. The liquid may be an aqueous liquid such as water, an aqueous solution, or an aqueous emulsion, an organic solvent, an oil-based liquid using these as a medium, or a mixture thereof.

The amount of impregnation of the liquid to be used is not particularly limited as long as a predetermined effect can be obtained, and can be appropriately selected according to the purpose. The amount of the liquid impregnated may be, for example, 100 to 1000 parts by mass, preferably 150 to 800 parts by mass with respect to 100 parts by mass of the nonwoven fabric.

As the active ingredient, various beauty ingredients, cleaning ingredients, cleaning ingredients, disinfecting ingredients, medicinal ingredients, refreshing ingredients, insect repellent ingredients, coating agents, paints, finishing agents (for example, varnishes, etc.) are used depending on the application. These active ingredients may be used alone or in combination of two or more.

As the active ingredient, a known or commonly used active ingredient can be used, and an appropriate solvent (water, ethanol, glycerin, propylene glycol, dipropylene glycol, butylene glycol, etc.) is used depending on the type and application of the active ingredient. , Auxiliary agents (emulsifiers, chelating agents, pH regulators, neutralizers, thickeners, lubricants, crystallization rate retarders, etc.), additives (ultraviolet absorbers, powders, antioxidants, preservatives, fragrances, etc.) , Fluorescent whitening agent, antistatic agent, flame retardant, deodorant, plasticizer, colorant, etc.) and the like can be used.

Beauty ingredients (ingredients for conditioning the body and appearance) include whitening ingredients, anti-aging (antioxidant, anti-wrinkle, anti-sagging) ingredients, anti-inflammatory (alleviating irritation, anti-allergic) ingredients, and cell activation (promoting turnover, DNA damage repair) ingredient, moisturizing ingredient, emollient ingredient, astringent ingredient, peeling ingredient, blood circulation promoting ingredient, antioxidant ingredient, warming ingredient, etc. , Vitamin E, astaxanthin, lucinol, acetylglucosamine, ellagic acid, tranexamic acid, linoleic acid, oxyproline, hydroxyproline, tocopherol and derivatives thereof, water-soluble polymers, amino acids, peptides such as EGF, sugar alcohols, sugars , Mucopolysaccharide, various plant extracts, placenta extract, capsaicin and the like.

Cleaning ingredients include nonionic surfactants, alcohols (ethanol, polyhydric alcohol, etc.), glycol ethers, oils (mineral oils, ester oils, waxes, silicone oils, etc.) for the purpose of cleaning the skin. Natural oil, etc.).

Examples of the cleaning component include amphoteric surfactants, cationic surfactants, anionic surfactants, solvents, alkaline agents and the like, in addition to the above-mentioned cleaning components.

As disinfectant components, chlorine-based disinfectants (chlorite such as sodium chlorite, hypochlorite such as sodium hypochlorite, chlorate such as sodium chlorite, and excess such as sodium perchlorite) Chlorate and chlorinated cyanurates such as dichloroisopropylmethylphenol cyanurate), alcohols (ethanol, isopropanol, etc.), double-sided surfactants, quaternary ammonium salts (benzalconium chloride, benzethonium chloride, etc.) ), Chlorhexidine, etc.

As the medicinal ingredient, various medicinal ingredients can be used depending on the intended use. For example, as the medicinal ingredient used for poultices, anti-inflammatory agents, antihistamines, steroids, analgesic and anti-inflammatory agents, local anesthetics, etc. And so on.

Examples of the refreshing component include alcohols such as ethanol, menthol, peppermint oil, peppermint oil, camphor (thymol), thymol, spirantol, and refreshing agents such as methyl salicylate.

Examples of the insect repellent component include eucalyptus extract, menthol, peppermint oil, diethyl toluamide and the like.

For example, a cosmetological face mask contains a cosmetological ingredient and a solvent, and may contain other active ingredients, auxiliaries, additives and the like, if necessary.
The cleansing sheet contains a cleansing ingredient, and may contain other active ingredients (eg, cosmetological ingredients, etc.), solvents, auxiliaries, additives, and the like, if necessary.
The cleaning wiper contains a cleaning component, and may contain other active ingredients (coating agent, finishing agent, paint, etc.), solvent, auxiliary agent, additive, and the like, if necessary.
The sterilizing / virus wiper contains a disinfecting component, and may contain other active ingredients (moisturizing component, etc.), a solvent, an auxiliary agent, an additive, and the like, if necessary.
The itch suppressing sheet contains a medicinal ingredient, and may contain other active ingredients (cooling ingredient, moisturizing ingredient, etc.), a solvent, an auxiliary agent, an additive, and the like, if necessary.
The antiperspirant sheet contains a refreshing component, and may contain other active ingredients (convergence component, moisturizing component, etc.), a solvent, an auxiliary agent, an additive, and the like, if necessary.
The insect repellent sheet contains an insect repellent component, and may contain other active ingredients (moisturizing component, etc.), a solvent, an auxiliary agent, an additive, and the like, if necessary.

Further, in the liquid impregnated sheet of the present invention, the nonwoven fabric itself has excellent compressive deformation in a wet state, can deform the liquid when pressed to release the liquid, and has a high compression recovery rate, so that even when wet, the liquid is post-deformed. A soft feel can be maintained without sagging. Therefore, it is useful to use it as a skin care sheet to be used for the skin by utilizing its cushioning property and good touch. The skin care sheet may be a sheet for so-called rubbing, which rubs the skin, or a sheet for so-called non-rubbing, which does not rub the skin.

The liquid impregnated sheet of one embodiment is a sheet for non-rubbing use, and is a beauty sheet impregnated with a beauty ingredient (for example, a beauty mask, a nail care sheet, a scalp care sheet, a back, a chest, an abdomen, etc.). It can be used as a sheet (sheet, hygiene sheet, etc.), a medicated or therapeutic sheet (itch control sheet, wet cloth, etc.).

In addition, the liquid impregnated sheet of one aspect is a make-up removal sheet or cleansing sheet impregnated with a wiping cleansing component, a body cleaning sheet (sweat wipe sheet, antiperspirant sheet, hair, scalp wipe) as a sheet for rubbing. , Wet wipes, hygiene sheets, etc.), insect repellent sheets, cooling sensation sheets, medicated or therapeutic sheets (itching control sheets, etc.).

Further, since the liquid impregnated sheet and the non-woven fabric for liquid impregnation in one embodiment have a small coefficient of static friction against the skin in both the dry state and the wet state, resistance to the skin even when the liquid content in the sheet or the non-woven fabric decreases. It is possible to continue wiping while suppressing the increase in the amount of water.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the present Examples. In the following Examples and Comparative Examples, various physical properties were measured by the following methods.

[Metsuke and apparent density]
^{The basis weight (g / m 2} ) was measured according to 6.2 of JIS L 1913 “General non-woven fabric test method”. The apparent density (g / cm ³ ) was calculated by dividing the basis weight by the thickness.

〔thickness〕
With reference to JIS L 1913, the thickness of a circular horizontal plate having a diameter of 43.7 mm ^{when a load of 5 g / cm 2} was applied was measured with a thickness measuring device, and the thickness was taken as the thickness of the non-woven fabric.

[Compression change rate and compression recovery rate]
A non-woven fabric laminate obtained by stacking 10 non-woven fabrics cut into a size of 10 cm square was prepared and used as a sample for drying. ^{A load of 5 g / cm 2} is applied to the nonwoven fabric laminate in the thickness direction with a thickness measuring instrument of a circular horizontal plate having a diameter of 43.7 mm, and the thickness A (mm / mm /) of the nonwoven fabric laminate after 10 seconds. After measuring (10 sheets), a higher load of 40 g / cm ² was applied in the thickness direction, and the thickness B (mm / 10 sheets) of the nonwoven fabric laminate after 30 seconds was measured. Then, the original load ^{was returned to 5 g / cm 2} , and the thickness C (mm / 10 sheets) of the nonwoven fabric laminate after 30 seconds was measured. From the obtained thicknesses A to C (mm / 10 sheets), the compression change rate and the compression recovery rate were calculated by the following formulas, respectively.
Compression rate of change (%) = (AB) / A × 100
Compression recovery rate (%) = (CB) / A × 100

[Compression change rate and compression recovery rate when wet]
Prepare 10 sheets of non-woven fabric cut into a size of 10 cm square, and distill water (Fuji Film Wako Pharmaceutical Co., Ltd. product number 042-16973) and glycerin (Kenei Pharmaceutical Co., Ltd. glycerin P "Kenei"). It was immersed in a mixed solution prepared at a ratio (mass ratio) of 5 glycerin 4. ^{After 30 minutes, it was taken out of the water, and a load of 5 g / cm 2} was applied in the thickness direction to a 10-ply laminated non-woven fabric laminate with a thickness measuring instrument of a circular horizontal plate having a diameter of 43.7 mm, and 10 seconds later. After measuring the thickness A (mm / 10 sheets) of the nonwoven fabric laminate, a higher load of 40 g / cm ² is applied in the thickness direction, and the thickness B (mm / 10 sheets) of the nonwoven fabric laminate 30 seconds later is applied. Was measured. Then, the original load ^{was returned to 5 g / cm 2} , and the thickness C (mm / 10 sheets) of the nonwoven fabric laminate after 30 seconds was measured. From the obtained thicknesses A to C (mm / 10 sheets), the compression change rate and the compression recovery rate were calculated by the following formulas, respectively.
Compression rate of change (%) = (AB) / A × 100
Compression recovery rate (%) = (CB) / A × 100

[Standing coefficient of friction between non-woven fabric and bioskin]
The frictional force was measured with reference to ASTM-D1894 using a precision universal testing machine (“Autograph AGS-D type” manufactured by Shimadzu Corporation).

First, as shown in FIG. 2, a sample 30 cut out from the obtained nonwoven fabric in a mechanical direction (MD) 4.0 cm × a width direction (CD) 11.0 cm was prepared. In the sample 30 of FIG. 2, in the width direction, a width of 1 cm from the end is used as a gripping portion 31a, and the remaining 10 cm width is used as a ground contact portion 31b. When the measurement was performed when the sample was wet, the sample was impregnated with distilled water (Part No. 042-16973 manufactured by Fuji Film Wako Pharmaceutical Industries, Ltd.) in an amount of 400% by mass.

Next, using artificial skin bioskin plate Part No. P001-001 manufactured by Bulux Co., Ltd. as the friction member, the sample 30 was placed on the friction member 35 as shown in FIGS. 3 and 4, and the sample 30 was placed. A test was conducted in which the grip portion 31a was gripped by the clip 36, and the sample 30 was pulled in the direction of the arrow with a predetermined load applied from the weight 38 via the acrylic plate 37.

Specifically, as shown in FIG. 4, in a precision universal testing machine equipped with a load cell 32, the friction member 35 was placed on the table 39, and the sample 30 was placed on the friction member 35. The sample 30 and the friction member 35 are arranged with grip portions 31a and 35c in opposite directions, respectively, and these grip portions 31a and 35c are gripped by clips 36.

Next, an acrylic plate 37 of the same size is placed in the range (ground portion) of the sample 30 in the mechanical direction (MD) 4.0 cm × width direction (CD) 10.0 cm, and the total of the acrylic plate 37 and the weight 38 is placed. A test force obtained by pulling the sample 30 horizontally in the width direction (CD) at a speed of 200 mm / min by pulling the polyamide thread 34 horizontally through the pulley 33 with a load of 5 g / cm ^{2 applied.} The static friction coefficient was calculated from the above.

[Test on usability]
(sample)
Four sheets cut into a size of 7 cm square were stacked to prepare a sample for drying. When preparing a wet sample, distilled water (Fuji Film Wako Pharmaceutical Co., Ltd., product number 042-16973) and glycerin (Kenei Pharmaceutical Co., Ltd. glycerin P "Kenei") are mixed with distilled water 5 glycerin. The mixed solution prepared at the ratio of 4 (mass ratio) was dropped by 450% by mass from a position 2 cm above the sample by 0.3 cc and impregnated into the entire sheet to prepare a wet sample.

(Test by panel)
Nine subjects (women in their twenties, thirties, and forties) hold one end with their right hand so that the width direction (CD) of the sample is perpendicular to the finger, as shown in FIG. Hold the index finger and middle finger, and the opposite end between the ring finger and little finger, respectively, and while lightly pressing the inside of the middle finger and ring finger, touch the wiping part of the sample [width direction (CD) 3 cm x machine direction (MD) 7 cm]. I rubbed my cheeks twice sideways without changing the surface.
Each sample was evaluated for three items: softness in the thickness direction, surface irritation, and fluffiness.

[Dry / wet state Softness in the thickness direction]
A sensory test was carried out by the above method, and the softness in the thickness direction was judged in the following three stages. 〇: Very soft to the touch and elastic △: Slightly hard to the touch and low elasticity ×: Hard to the touch and not elastic

[Dry / wet surface irritation]
A sensory test was carried out by the above method, and the irritation to the skin was judged in the following three stages.
〇: I do not feel the stimulus △: I feel a little stimulus ×: I feel a strong stimulus

[Dry / wet fluffiness]
The test was carried out by the above method, and the judgment was made in the following three stages according to the following criteria.
After the test, the used surface is leveled, and the fiber protruding from the surface in the range of 3 cm in the width direction (CD) x 7 cm in the machine direction (MD) pressed inside the middle finger and ring finger, which corresponds to the wiped part shown in FIG. I counted the number.
〇: 3 or less △: 4 or more and 6 or less ×: 7 or more

The above three items were evaluated in a dry state and a wet state, respectively, and the number of people evaluated in each item was taken as the sensory evaluation result.
A: 〇 is 7 or more B: 〇 is 4 or more and 6 or less C: 〇 is 3 or less

When a non-woven fabric already impregnated with a component such as a liquid is used, it is preferable to measure and evaluate the physical properties after removing the impregnated component once according to the following procedure.
Specifically, the non-woven fabric impregnated with a component such as a liquid is immersed in the cleaning liquid for 2 hours, and the non-woven fabric is washed in order to remove the component pre-impregnated in the obtained non-woven fabric from the non-woven fabric. The amount of the cleaning liquid is 2 L per ^{100 cm 2 of the non-woven fabric area.} Further, the impregnating component is not particularly limited as long as it can be removed, but for example, ion-exchanged water / neutral detergent = 95/5 (volume ratio) may be used as the cleaning liquid. As the neutral detergent, for example, Kao Corporation cucute (trademark) is used, and the nonwoven fabric is allowed to stand in a liquid. Then, after immersing in the same amount of ion-exchanged water for 2 hours to drop the cleaning liquid, the non-woven fabric was air-dried (conditions: 10 ° C., 65% RH, 24 hours) so as not to change the shape of the non-woven fabric as much as possible. It can be a sample.

(Reference example 1)
Polyester terephthalate chips having di-n-butyl phosphate units as polyester (P) in a ratio of 2.5 mol% with respect to the total carboxylic acid component in terms of phosphorus atoms, and 10 titanium dioxide as polyester (Q). Polyester terephthalate chips containing% by mass are blended at a mass ratio of polyester (P) / polyester (Q) = 40/60, and after drying, the blend is melted by a melting device provided on the upstream side of the melting spinning device. After that, it is supplied to a melt spinning apparatus, melt-spun at 280 ° C. from a spinneret having a spinning hole, taken up at 1000 m / min, then stretched 2.5 times at 70 ° C., and then mechanically wound by a conventional method. Polyester with shrinkage, cut to a fiber length of 51 mm, fiber diameter 1.7 dtex (dtex is abbreviated as T in the table), phosphorus modification rate 0.96 mol%, titanium dioxide content 6.0% by mass. Manufactured fiber staples.

(Reference example 2)
Phosphorus-modified polyester fibers were obtained in the same manner as in Reference Example 1 except that the phosphoric acid modification rate was changed to 2.0 mol%.

(Reference example 3)
A phosphorus-modified polyester fiber was obtained in the same manner as in Reference Example 1 except that the fineness was changed to 3.3 dtex.

(Example 1)
After uniformly blending the phosphorus-modified polyester fibers obtained in Reference Example 1, ^{a semi-random card web having a grain size of 50 g / m 2} was prepared by a conventional method, and the card web was punched with an aperture ratio of 25% and a hole diameter of 0.3 mm. It was placed on a drum support and continuously transferred in the longitudinal direction at a speed of 50 m / min, and at the same time, a high-pressure water stream was sprayed from above to perform entanglement treatment to produce an entangled fiber web (nonwoven fabric). In this entanglement process, two nozzles having an orifice with a hole diameter of 0.10 mm at an interval of 0.6 mm along the width direction of the web are used (distance between adjacent nozzles is 10 cm), and the nozzles in the first row are used. The water pressure of the high-pressure water flow jetted from was 3.0 MPa, and the water pressure of the high-pressure water flow jetted from the nozzles in the second row was 4.0 MPa. It was placed on a flat support over the entire surface having a finer mesh and continuously transferred, and a high-pressure water stream was sprayed to perform entanglement treatment. This entanglement treatment was performed using two nozzles in which orifices having a hole diameter of 0.10 mm were provided at intervals of 0.6 mm along the width direction of the web, and both were performed under the condition of a high-pressure water flow with a water pressure of 4.0 MPa. .. Further, the fabric was dried at 130 ° C. to obtain a spunlace nonwoven fabric having a basis weight of 50.2 g / m ^2.

(Example 2)
A spunlace nonwoven fabric having ^{a basis weight of 51.1 g / m 2} was obtained in the same manner as in Example 1 except that the phosphorus-modified polyester fiber obtained in Reference Example 2 was used.

(Example 3)
A spunlace nonwoven fabric having ^{a basis weight of 48.8 g / m 2} was obtained in the same manner as in Example 1 except that the phosphorus-modified polyester fiber obtained in Reference Example 3 was used.

(Comparative Example 1)
After uniformly mixing the phosphorus-modified polyester fibers obtained in Reference Example 1, ^{a semi-random card web having a basis weight of 100 g / m 2} was prepared by a conventional method, and then two of them were laminated to have a punch density of 90 punches / cm. ² subjected to needle punching at a basis weight was obtained needle punched non-woven fabric of 197.1 g / ^{m 2.}

(Comparative Example 2)
The spunlace non-woven fabric obtained in Example 1 was put into a conventional dyeing kettle with spunlace non-woven fabric and water, and heat-treated at 130 ° C. for 60 minutes. After further dehydration, the fabric was dried with hot air at 120 ° C. to obtain an anti-pilling-treated spunlace nonwoven fabric having ^{a basis weight of 50.5 g / m 2.}

(Comparative Example 3)
After uniformly mixing the phosphorus-modified polyester fibers obtained in Reference Example 1, ^{a semi-random card web having a grain size of 50 g / m 2} was prepared by a conventional method, and a heat embossed roll having a diamond-shaped staggered arrangement with a crimping area of 20% was heated to 230 ° C. It was heated, applied with a linear pressure of 25 kg / cm, and heat-treated at a speed of 10 m / min to obtain an embossed nonwoven fabric having a ^{texture of 51.3 g / m 2.}

(Comparative Example 4)
Same as Example 1 except that a semi-random card web with ^{a basis weight of 50 g / m 2} is produced using only cotton (manufactured by Marusan Sangyo Co., Ltd., fineness 1.0 to 2.2 dtex, fiber length 10 to 30 mm). A spunlace nonwoven fabric having a basis weight of 49.8 g / m ^{2 was obtained.}

Since the phosphorus-modified polyester fibers are used in Examples 1 to 3, they have a higher compression change rate and compression recovery rate than those of Comparative Examples 1 to 3 in both the dry state and the wet state. Further, in Examples 1 to 3, the occurrence of fluffing during drying and wetting can be suppressed. In particular, the non-woven fabrics of Examples 1 and 2 can suppress irritation to the skin both when dry and when wet.

On the other hand, in Comparative Example 1, which is a needle punched nonwoven fabric having a high basis weight, even when a phosphorus-modified polyester fiber is used, the characteristics of the phosphorus-modified polyester fiber can be effectively utilized due to the height of the basis weight. It cannot be done, fluffing occurs, and both the compression change rate and the compression recovery rate are poor.

Further, in Comparative Example 2 in which the non-woven fabric obtained in Example 1 was treated with hot water, the modified portion was hydrolyzed and the fibers were cut, and a large amount of fluffing occurred both in the dry state and in the wet state. In addition, both when dry and when wet, the cut end causes irritation to the skin. Furthermore, since the elasticity of the fiber is reduced, it is not possible to exhibit softness in the thickness direction both when it is dry and when it is wet. In addition, the compression change rate and the compression recovery rate at the time of wetting are both poor.

Further, in Comparative Example 3 integrated by the embossing roller, since the fibers are not three-dimensionally entangled, even when the phosphorus-modified polyester fiber is used, the thickness of the nonwoven fabric as a whole is in the thickness direction both when it is dried and when it is wet. The softness of the fabric cannot be exhibited, and the compression change rate and the compression recovery rate at the time of wetting are both poor. Furthermore, it is not possible to suppress the occurrence of fluffing both when it is dry and when it is wet.

In Comparative Example 4, which is simply cotton, since it lacks elasticity, it cannot exhibit softness in the thickness direction both when it is dry and when it is wet, and it is also irritating to the skin when it is wet. .. Further, the compression change rate at the time of wetting is not good, and the compression recovery rate at the time of wetting is extremely poor.

(Example 4)
70 parts by mass of cellulose-based fiber (regenerated cellulose fiber, "Hope" manufactured by Omikenshi Co., Ltd., fineness 1.7 dtex, fiber length 40 mm), non-adhesive core-sheath type composite fiber (core part is composed of polyethylene terephthalate, reference example 20 parts by mass of the phosphorus-modified polyester fiber obtained in the above, adhesive core-sheath type composite fiber (core-sheath type composite fiber whose core part is made of polypropylene and whose sheath part is made of polyethylene, manufactured by Ube Eximo Co., Ltd., fineness After uniformly mixing cotton with 1.7 dtex, fiber length 51 mm, and core-sheath mass ratio (core 39% sheath 61%) at a ratio of 10 parts by mass, ^{a semi-random card web with a grain size of 40 g / m 2} was prepared by a conventional method. Then, this card web is placed on a punching drum support having an opening ratio of 25% and a hole diameter of 0.3 mm and continuously transferred in the longitudinal direction at a speed of 50 m / min, and at the same time, a high-pressure water stream is jetted from above to entangle. The treatment was performed to produce an entangled fiber web (non-woven fabric). In this entanglement treatment, two nozzles having an orifice with a hole diameter of 0.10 mm provided at an interval of 0.6 mm along the width direction of the web were used. (Distance between adjacent nozzles is 10 cm), the water pressure of the high-pressure water flow jetted from the first row nozzles was 3.0 MPa, and the water pressure of the high pressure water flow jetted from the second row nozzles was 4.0 MPa. The fibers were placed on a flat support over the entire surface and continuously transferred, and high-pressure water flow was sprayed to perform entanglement processing. In this entanglement processing, an orifice having a hole diameter of 0.10 mm was placed along the width direction of the web. Using two nozzles provided at intervals of 0.6 mm, both were performed under the condition of a high-pressure water flow with a water pressure of 4.0 MPa. Further dried at 130 ° C. and had a grain size of 39.9 g / m ² . A spunlace non-woven fabric was obtained.

(Example 5)
A spunlace nonwoven fabric having a basis weight of 30.4 g / m ² was obtained in the same manner as in Example 4 except that the fiber composition ratios shown in Table 2 were changed to ^{prepare a semi-random card web having a basis weight of 30 g / m 2.}

(Example 6)
By changing to the fiber composition ratio shown in Table 2, a ^{semi-random card web with a grain size of 100 g / m 2} was prepared, and the water pressure of the high-pressure water flow jetted from the nozzles in the first row was sprayed from the nozzles in the second row at 5.0 MPa. The water pressure of the high-pressure water flow was 7.0 MPa, and then the water pressure of the high-pressure water flow to be sprayed was changed to 7.0 MPa by placing it on a flat support with a fine mesh and continuously transferring it. A spunlaced nonwoven fabric having a grain size of 99.2 g / m ^{2 was obtained in the same manner as in Example 4.}

(Example 7)
A spunlace nonwoven fabric having a basis weight of 50.5 g / m ² was obtained in the same manner as in Example 4 except that the fiber composition ratios shown in Table 2 were changed to ^{prepare a semi-random card web having a basis weight of 50 g / m 2.}

(Comparative Examples 5-9)
Semi-random card using polyester fiber ("Tetron" T-471 manufactured by Toray Industries, Inc., fineness 1.6dtex, fiber length 51mm) instead of phosphorus-modified polyester fiber, and changing the fiber composition ratio and texture shown in Table 1 A spunlaced nonwoven fabric was obtained in the same manner as in Examples 1 and 4 to 7, respectively, except that a web was prepared.

As shown in Table 2, the corresponding Example 1 and Comparative Example 5, Example 4 and Comparative Example 6, Example 5 and Comparative Example 7, Example 6 and Comparative Example 8, and Example 7 and Comparative Example 9 respectively. To compare.
In Comparative Examples 5 to 9, since general-purpose PET fibers are used instead of phosphorus-modified polyester fibers, the non-woven fabric in a dry state has strong irritation to the skin regardless of the proportion of PET fibers. ing. In addition, the strong irritation to the skin is also reflected in the static friction coefficient of the bioskin / non-woven fabric, and due to the high strength of PET fibers, a strong force is required to move the non-woven fabric against the bioskin. Is.

In particular, in Comparative Examples 6 to 8, since the proportion of cellulosic fibers is high, the non-woven fabric when wet cannot exhibit softness in the thickness direction. Further, in Comparative Example 8 which does not contain the interlining sheath type composite fiber, a large amount of fluffing occurs both in the dry state and in the wet state. Since the proportion of PET fibers is high in Comparative Example 9, the nonwoven fabric has irritation to the skin when it is dry and when it is wet. Since Comparative Example 5 is composed of only PET fibers, the nonwoven fabric has irritation to the skin when it is dry and when it is wet, as in Comparative Example 9. Furthermore, since it does not contain interlining-sheath type composite fibers, a lot of fluffing occurs both when it is dry and when it is wet.

On the other hand, in Examples 1 and 4 to 7, which correspond to these comparative examples, phosphorus-modified polyester fibers are used, so that the non-woven fabric can suppress irritation to the skin in both the dry state and the wet state. There is. Further, in Examples 1 and 4 to 7, even when the interlining-sheath type composite fiber is not contained, the occurrence of fluffing during drying and wetting can be suppressed.

Further, when Examples 1 and 4 to 7 and the corresponding Comparative Examples 5 to 9 are compared with each other, the phosphorus-modified polyester fiber and the PET fiber are only different from each other, but both Examples correspond to each other. Compared with the comparative example, the compression change rate and the compression recovery rate are greatly improved, the liquid can be greatly deformed in the state of containing the liquid, so that the liquid release property can be improved, and the compression recovery rate is high, so that the liquid can be used. Even after being included and deformed, the non-woven fabric has elasticity without sagging.

The non-woven fabric of the present invention has excellent cushioning properties in the thickness direction, and also has a good compression change rate and compression recovery rate when impregnated with a liquid. It can be suitably used in industrial applications and the like.

As described above, the preferred embodiment of the present invention has been described, but various additions, changes or deletions can be made without departing from the spirit of the present invention, and such things are also included in the scope of the present invention. Will be.

10 Non-woven fabric 20 Non-woven fabric laminate 30 Sample 31a Sample gripping part 31b Sample grounding part 32 Load cell 33 Pulley 34 Polyamide thread 35 Friction member 36 Clip 37 Acrylic plate 38 Weight 39 Table

Claims (13)

1. It contains phosphorus-modified polyester fibers having a modified site modified by a phosphorus compound, has a texture of 150 g / m ² or less, and the phosphorus-modified polyester fibers are entangled with each other by three-dimensional entanglement in the thickness direction. Non-woven fabric.
2. The non-woven fabric according to claim 1, further containing cellulosic fibers, in which the phosphorus-modified polyester fibers and the cellulosic fibers are entangled between the fibers by three-dimensional entanglement in the thickness direction.
3. The nonwoven fabric according to claim 2, wherein the mass ratio of the cellulosic fiber to the phosphorus-modified polyester fiber is (former / latter) = 95/5 to 10/90.
4. The nonwoven fabric according to any one of claims 1 to 3, further containing an interlining sheath type fiber, and at least the phosphorus-modified polyester fiber and the interlining sheath type fiber are three-dimensionally entangled in the thickness direction. Non-woven fabric that is entwined between fibers.
5. The nonwoven fabric according to claim 4, wherein the mass ratio of the interlining sheath type composite fiber to the phosphorus-modified polyester fiber is (former / latter) = 70/30 to 5/95.
6. The nonwoven fabric according to any one of claims 1 to 5, wherein the polyester fiber has a phosphorus modification rate of 0 as the ratio of phosphate atoms to the total acid component in the polyester polymer forming the fiber. .5-5 mol% non-woven fabric.
7. The nonwoven fabric according to any one of claims 1 to 6 and having a spunlace structure.
8. The nonwoven fabric according to any one of claims 1 to 7, wherein the compression change rate at the time of wetting is 18.0% or more.
9. The non-woven fabric according to any one of claims 1 to 8 and having a compression recovery rate of 7.0% or more when wet.
10. The non-woven fabric according to any one of claims 1 to 9, wherein the non-woven fabric has a coefficient of static friction between the non-woven fabric at the time of drying and bioskin (artificial skin) of 0.060 or less.
11. The non-woven fabric according to any one of claims 1 to 10, which is to be applied to the human body.
12. A liquid impregnated sheet using the non-woven fabric according to any one of claims 1 to 11.
13. A wipe sheet using the non-woven fabric according to any one of claims 1 to 11.

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