JPH07189132A - Hydrophilicity improver for fiber, nonwoven fabric using the same and production of the nonwoven fabric - Google Patents

Abstract

PURPOSE:To obtain a hydrophilicity improver capable of significantly improving fiber hydrophilicity and of homogeneously dispersing fibers in water in producing nonwoven fabrics by wet process with little frothing, also enabling high-quality nonwoven fabrics to be produced. CONSTITUTION:This hydrophilicity improver for fibers comprises a highly water- absorbing resin and a polyester produced by polycondensation between a polyhydric alcohol and a polyfunctional carboxylic acid. A method for producing nonwoven fabric coated with the highly water-absorbing resin on its surface is characterized by containing a process to coat the constituent fibers with the above improver.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a hydrophilicity improver for fibers,
A non-woven fabric using the same and a method for producing the same. More specifically, when a wet non-woven fabric is produced by a wet method, a hydrophilicity-improving agent for fibers, which is useful for imparting a hydrophilicity-improving agent for fibers to the fibers and smoothly performing papermaking, is used. Nonwoven fabric and its manufacturing method.

[0002]

2. Description of the Related Art Conventionally, many methods of making a nonwoven fabric by a wet method using a fiber material have been proposed. In order to improve the strength of the nonwoven fabric by any method,
There are various problems to be solved. The main problem is that hydrophobic fibers such as polyester fibers are difficult to disperse in water. Dispersants have been investigated to improve this.

For example, JP-A-55-103305 discloses an attempt to improve the dispersibility of a polyolefin fiber in water by using an alkali metal salt such as a modified rosin or an ethylene-acrylic acid copolymer. However,
When such a method is adopted, foaming, particularly foaming in the beater of the disintegrator, occurs, which is a practical problem.

Further, there has been proposed a method of improving dispersibility by using a stabilizer such as sodium polyacrylate, polyethylene glycol, Troloois or polyacrylamide. However, in order to sufficiently improve the dispersion stability of the fibers by such a method, it is necessary to increase the solution viscosity of the papermaking solution, so that the drainage rate becomes low and the productivity is lowered. There is a problem that the content concentration of the fiber is inevitable.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, and when a nonwoven fabric is manufactured by a wet method, the fibers are uniformly dispersed in water by light stirring to reduce the solution viscosity. A hydrophilicity-improving agent for fibers, which can suppress the occurrence of foaming, increase the drainage rate, and obtain a non-woven fabric having a uniform and uniform texture, and a nonwoven fabric using the hydrophilicity-improving agent And a method for producing the same.

[0006]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that hydrophobic synthetic fibers using a hydrophilicity-improving agent for fibers containing polyester and superabsorbent resin are used. It has been found that the above-mentioned problems can be solved when the above-mentioned treatment is performed, and further that the non-woven fabric subjected to such treatment is useful as a filter cloth, a packaging material, a roofing material, a wiping cloth (cloth width), etc. Heading, it came to complete the present invention.

The present invention is a hydrophilicity-improving agent for fibers characterized by containing a polyester and a super absorbent polymer,
A method for producing a non-woven fabric by a wet method, which comprises a step of treating the fiber with the hydrophilicity-improving agent for fibers, and a method for producing a non-woven fabric having a superabsorbent resin adhered to the surface of the fiber and a fiber for forming the non-woven fabric. The present invention relates to a non-woven fabric having a super absorbent polymer adhered to its surface.

[0008]

ACTION AND EXAMPLE The hydrophilicity improver for fibers of the present invention is
As described above, it contains the polyester and the super absorbent polymer.

Examples of the polyester include those obtained by polycondensing a polyhydric alcohol and a polycarboxylic acid.

The polyhydric alcohol is an alcohol having two or more hydroxyl groups in the same molecule, such as ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, hexylene glycol,
Glycerol, _{formula: H- (OCH 2 CH 2)} m -OH
(In the formula, m represents an integer of 1 to 150), polyethylene glycol, polypropylene glycol, polybutylene glycol, pentaerythritol, trimethylolpropane, trimethylolethane, sorbitol, an alkylene oxide adduct of the polyhydric alcohol ( The number of moles added is 1 to 150), and aromatic groups such as bisphenol A, bisphenol AF, bisphenol B, bisphenol C, bisphenol F, bisphenol G, bisphenol K, bisphenol PA, bisphenol S, and bisphenol Z are added. Examples thereof include alkylene oxide adducts of polyhydric alcohols (the number of added moles is 2 to 150), and these polyhydric alcohols may be used alone or in admixture of two or more.

Typical examples of the bisphenol compound include, for example,

[0012]

[Chemical 1] And so on.

Among the above polyhydric alcohols, alkylene oxide adducts of bisphenol sulfone, such as ethylene oxide and ethylene oxide, are added from the viewpoint of improving the foaming prevention property in addition to the dispersibility and dispersion stability of the hydrophobic fiber in the paper making process. Propylene oxide adducts (addition mole number 2-20) and / or diethylene glycol are used as particularly preferred compounds. In this case, other polyhydric alcohol may be used in combination with the above particularly preferable polyhydric alcohol.
Examples of the polyhydric alcohol that can be used in combination include alkylene oxide addition of polyhydric alcohol having an aromatic group such as bisphenol A, bisphenol AF, bisphenol B, bisphenol C, bisphenol F, bisphenol G, bisphenol K, bisphenol PA, and bisphenol Z. Substances, ethylene glycol, propylene glycol, glycerin and the like. However,
In this case, the particularly preferable amount of the polyhydric alcohol used is 10% by weight based on the total weight of the polyhydric alcohol used.
Above, it is desirable to be 25% by weight or more.

The polyvalent carboxylic acid used in the present invention is a carboxylic acid having two or more carboxyl groups in the same molecule, and a dibasic acid is particularly preferable, but in addition to the dibasic acid, a tribasic acid is partially used. You may use. Among the dibasic acids,
Aromatic dicarboxylic acids are preferred from the viewpoint of dispersibility of hydrophobic fibers, dispersion stability, and market price. Specific examples of the polycarboxylic acid include aromatic polycarboxylic acids such as isophthalic acid, terephthalic acid, trimellitic acid and naphthalenedicarboxylic acid; maleic acid, fumaric acid, succinic acid, adipic acid, sebacic acid and citraconic acid. Examples thereof include aliphatic polycarboxylic acids such as glutanoic acid, azelaic acid, pimelic acid, and suberic acid. These polyvalent carboxylic acids may be used alone or in admixture of two or more.

Among the above-mentioned polycarboxylic acids, isophthalic acid is used as a particularly preferable compound from the viewpoint of the dispersibility and dispersion stability of the hydrophobic fiber in the paper making process.

The polyester used in the present invention can be obtained by subjecting the polyhydric alcohol and the polycarboxylic acid to a polycondensation reaction by a known method. For example, the polymerization temperature is 190 to 250 ° C., and the polymerization time is 2 to 2
It is carried out for 0 hours using a catalyst such as dibutyltin laurate, titanium tetrapropoxide, sodium p-toluenesulfonate, while introducing an inert gas such as nitrogen gas.

The polyhydric alcohol and the polyhydric carboxylic acid are used in an amount of 1 to 2 mol, preferably 1.1 to 1.5 mol, of the polyhydric carboxylic acid with respect to 1 mol of the polyhydric alcohol. The polyester obtained by modifying the carboxyl group is preferable from the viewpoints of foam breaking property, dispersibility, solubility and the like.

Further, in the present invention, 5 or more per 100 total number of all terminal carboxyl groups of polyester,
More than 7 are polyoxypropylene (1-20
It is more preferable that the polyester is esterified with (addition of moles) alkyl (having 1 to 50 carbon atoms) from the viewpoint of improving the defoamability of the polyester. Also, from the viewpoint of improving the dispersibility or solubility of the polyester, it is preferable that 50 or less, particularly 43 or less, are similarly esterified with respect to the total number of all terminal carboxyl groups of the polyester.

The polyester usually has a waxy shape, and the weight average molecular weight thereof is 3,000 to.
It is preferably 20,000, especially 7,000 to 15,000. When the weight average molecular weight is less than the above range, the hydrophilic durability tends to be low and the effect of improving dispersibility tends to be small. When the weight average molecular weight is more than the above range, the melting point is high and the viscosity is high. Also tends to rise and become difficult to dissolve.

The super absorbent polymer used in the present invention includes, for example, starch-acrylonitrile graft copolymer, starch-acrylic acid graft copolymer, starch-styrene sulfonic acid graft copolymer, starch-
Grafted starch-based super absorbent polymer such as vinyl sulfonic acid graft copolymer, cellulose-acrylonitrile graft copolymer, cellulose-styrene sulfonic acid graft copolymer, crosslinked carboxymethyl cellulose and other cellulose superabsorbent resin, crosslinked polyvinyl Polyvinyl alcohol superabsorbent resin such as alcohol, crosslinked polyacrylic acid salt, polyacrylonitrile polymer saponified product, acrylic glycol superabsorbent resin such as polyethylene glycol di (meth) acrylate crosslinked product, crosslinked polyethylene oxide type, etc. Well-known superabsorbent resins such as a system are mentioned. Among these, acrylic superabsorbent resins and grafted starch superabsorbent resins are preferable from the viewpoint of improving the dispersibility and dispersion stability of the hydrophobic fibers in the papermaking process.

As a crosslinking method used for preparing the superabsorbent resin having a crosslinked structure, for example, a standing aqueous solution polymerization method in the reverse phase suspension polymerization method is used to further improve the water absorption capacity of the resin. However, the present invention is not limited to such a method.

As the highly water-absorbent resin, Japanese Patent Laid-Open No. Sho 63 is used.
JP-A-159405 proposes a copolymer comprising a vinyl monomer having a carboxyl group and a vinyl monomer having a hydroxyl group which reacts with the carboxyl group, in which a part of the carboxyl group is converted to a sodium salt. . In addition to this, for example, Japanese Patent Publication No. 54-30710
JP-A-59-62665, JP-A-55-
108407, Japanese Patent Publication No. 53-13495,
JP-A-55-144044 and JP-B-53-461
No. 99, JP-A-58-104901, etc., and the superabsorbent resin disclosed therein can be used in the present invention.

Specific examples of the super absorbent resin include, for example, AQUALIC CA (AQUALIC C manufactured by Nippon Shokubai Co., Ltd.).
AK-4, Aqualic ML-20, etc.), Aqualic CS, Oasis made by Technical Absorbent Co., Ltd., Sanwet (Sunwet 1M-1000MPS etc.) made by Sanyo Kasei Co., Ltd., Kao Corporation. Wonder Gel MX made by Sumitomo Chemical Co., Ltd.
Sumitomo Seika Co., Ltd.'s aquakeep, etc. are mentioned. Among these, aqualic CA, aqualic CS,
Oasis, Sunwet 1M-1000MPS and the like are preferably used from the viewpoint of improving the dispersibility and dispersion stability of the papermaking liquid.

The shape and size of the superabsorbent resin used in the present invention are not particularly limited, but usually, for example, powder (particle size: about 10 μm to 5 mm) or thread (length: about 0.
Those having a size of 1 to 10 cm and a fineness of about 0.1 to 3 denier) are preferably used. Further, it is preferable that the shape is as thin or small as possible from the viewpoint of water dispersibility.

The mixing ratio of the polyester and the super absorbent resin is 99.99 / 0.01 to 70/30 by weight.
It is particularly preferably 99.9 / 0.1 to 85/15. When the proportion of the polyester is higher than the above range, the dispersion stability of the papermaking solution tends to decrease, and when it is lower than the above range, the viscosity of the papermaking solution tends to increase.

The hydrophilicity-improving agent for fibers of the present invention may contain any component other than the polyester and the superabsorbent polymer as long as the object of the present invention is not impaired.

Examples of the optional components include polyoxyethylene styrenated phenol, polyethylene glycol fatty acid ester, polyoxyethylene alkyl ether, polyalkylene polyamine fatty acid polyamide type activator, aliphatic phosphate ester type activator, and aliphatic sulfate ester. Examples include type activators.

Fibers to which the hydrophilicity improver of the present invention can be applied include, for example, polyester fiber, polypropylene fiber, polyaramid fiber, polyvinyl fiber, acrylic fiber, modacrylic fiber, nylon fiber, rayon fiber and the like. In this case, polyester fiber, polyaramid fiber and the like are preferably used.

The fineness and fiber length of the fibers used in the present invention are from 0.5 to 20 denier, especially from 1.0 to 10 from the viewpoint of improving the uniformity of the texture of the nonwoven fabric and improving the strength.
The denier is preferably 3.0 denier, the fiber length is 0.5 to 30 mm, and particularly 3 to 15 mm.

Next, the method for producing the nonwoven fabric of the present invention will be described.

First, as a specific method of the step of treating the fibers with the hydrophilicity-improving agent for fibers, which is a feature of the production method of the present invention, for example, a dipping method, a spraying method, a showering method, and a roller-applying method. However, the dipping method is preferable from the viewpoint of improving the uniform adhesion of the hydrophilicity improver for fibers to the fibers. In the dipping method, for example, an aqueous dispersion is prepared in which the concentration of the hydrophilicity-improving agent composed of polyester and a water absorbent resin is preferably 0.5 to 5.0% by weight, and the aqueous dispersion and the fibers are preferably used. Has a bath ratio of 10: 1 to 50:
There is a method of mixing so as to be 1. When the concentration of the hydrophilicity-improving agent in the aqueous dispersion is lower than the above range, the water content of the fiber tends to increase and the drying time tends to be long in order to impart a predetermined amount of the hydrophilicity-improving agent to the fiber. If it is higher than the above range, dehydration after immersion tends to be difficult. When the bath ratio is smaller than the above range, mixing tends to be difficult, and when it is larger than the above range, the productivity tends to decrease. The mixing method is not particularly limited as long as each component is uniformly dispersed. The temperature may generally be about 20 to 30 ° C. After mixing, a centrifugal dehydrator is used or dehydration is performed by squeezing a mangle to impart a predetermined amount of the hydrophilicity-improving agent to the fibers together with water.

The amount of the hydrophilicity-improving agent applied is 0.01 to 5.0 parts by weight, especially 0.1
It is preferably about 2.0 parts by weight. When the applied amount is less than the above range, the effect of modifying the fiber surface is insufficient, the dispersibility in the papermaking process tends to be poor, and foaming tends to increase. Has
In the papermaking process, the hydrophilic treatment agent tends to fall off, and foaming tends to occur, which is uneconomical.

As a method for producing a nonwoven fabric by a wet method, a conventionally known method is applied. For example, papermaking method,
Specific examples include the cylinder net and the fourdrinier method.

According to the production method of the present invention, since hydrophilicity can be imparted to the fiber and the hydrophilicity is durable, foaming due to the dropping of the oil agent from the fiber is sufficiently prevented and the wet method is adopted. It is possible to remarkably improve the productivity of the nonwoven fabric. Moreover, the non-woven fabric obtained by the production method of the present invention is excellent in quality such as hiding property and tear strength, and has an extremely uniform texture.

Next, the nonwoven fabric of the present invention will be described.
The nonwoven fabric of the present invention is produced as described above, but is not limited to the one obtained by the above production method.

The non-woven fabric of the present invention is one in which the water-absorbent resin is attached to the surface of the fibers forming the non-woven fabric, and the form of attachment is not particularly limited, but may be, for example, a dot form. The state in which the polymer absorber is attached in a dot shape on the fiber surface refers to a state as shown in FIGS. 1 to 4, for example.

The texture of the nonwoven fabric of the present invention is extremely uniform and free of spots. Therefore, the tear strength of the non-woven fabric is improved, the hiding property is further improved, and various fields, for example, tea packs, green tea, filter bags such as sachets of Chinese herbs for decoction,
It is preferably used as a packaging material for fast foods, Japanese sweets, Western sweets, wiping cloth, chemical wipes, cloths such as hand towels, interior materials such as curtains, and roofing materials.

Next, the hydrophilicity-improving agent for fibers of the present invention, the non-woven fabric using the same and the method for producing the same will be described in more detail with reference to Examples, but the present invention is not limited to these Examples. Absent.

Production Example 1 8 mol of a polyoxyethylene (2 mol) adduct of bisphenol sulfone, 9 mol of a polyoxyethylene (7 mol) adduct of bisphenol sulfone, 2 isophthalic acid
0 mol, 3 mol of polyoxypropylene (7 mol) cetyl ether and dibutyltin laurate were charged in an amount of 0.3% by weight with respect to isophthalic acid into a reaction vessel, and nitrogen gas was introduced at 240 ° C. for 20 hours. The reaction was carried out. The weight average molecular weight of the obtained polyester is 7,50.
0, melting point was 45 ° C.

The methods for measuring the weight average molecular weight and the melting point will be described below.

(Weight average molecular weight) A sample was dissolved in tetrohydrofuran to prepare a solution having a specified concentration, and the solution was mixed with G
Inject into PC measuring device. The obtained chromatogram is compared with the chart of the standard sample, the molecular weight distribution is confirmed, and the weight average molecular weight is obtained.

(Melting point) A sample amount of 10 ± 1 mg is heated at 10 ° C./min by a differential scanning calorimeter (DSC). The melting end temperature (Tem) is determined from the obtained DSC curve.

Production Examples 2 to 8 Polyesters were obtained in the same manner as in Production Example 1 except that the blended monomer components and their blending amounts were changed as shown in Table 1. The properties of the polyesters obtained in these Production Examples 2 to 8 were all waxy.

The weight average molecular weight and melting point of the obtained polyester are shown in Table 1.

The abbreviations in the table mean the following components. BPS2: polyoxyethylene (2 mol) adduct of bisphenol sulfone BPS7: polyoxyethylene (7 mol) adduct of bisphenol sulfone PEG: polyethylene glycol (molecular weight 1540) PEG: polyethylene glycol (molecular weight 300) DEG: diethylene glycol EG: ethylene Glycol IPA: isophthalic acid TPA: terephthalic acid C ₁₆ 7: polyoxypropylene (7 mol) cetyl ether

[0046]

[Table 1]

Example 1 18 g of the wax-like polyester obtained in Production Example 1 and Acrylic CA K-4 (Nippon Shokubai Co., Ltd.), which is a powdery (particle diameter of about 200 μm) acrylic superabsorbent resin
2 g, water 1980 g, polyester fiber (polyethylene terephthalate, fineness 1.2 denier, fiber length 10)
(100 mm) was placed in a 3 liter beaker, mixed with a propeller-type stirrer, and then dehydrated by a centrifugal dehydrator to obtain 120 g of a polyester fiber containing 0.2 g of a hydrophilicity-improving agent and water. The hydrophilicity, the hydrophilic durability, and the presence of bubbles on the fiber surface of the obtained polyester fiber were evaluated according to the following methods. The results are shown in Table 2.

(Hydrophilicity, hydrophilic durability, and presence of bubbles on the fiber surface) 1.2 g of the treated fiber was put together with 1,000 g of water in a 3-liter iron container equipped with a propeller stirrer at 3,000 rpm. After stirring for 5 minutes, the mixture was transferred to a 1 liter glass beaker and left standing for 20 minutes.
Since the inside of the beaker is separated into a fiber layer and a transparent water layer, the depth of the transparent water layer was measured to determine the hydrophilicity and the presence or absence of bubbles on the fiber surface was visually determined.

The higher the hydrophilicity, the deeper the transparent water layer becomes. When the fiber layer was above the transparent water layer, the depth of the transparent water layer was measured and displayed as a negative value.

Next, the stock solution in the 1 liter beaker was removed, 500 g of water was newly added, and the amount of 3,0 was again added.
After stirring at 00 rpm for 5 minutes, the same operation as described above was performed to measure the depth of the transparent water layer to determine the hydrophilicity and water resistance, and at the same time visually confirm the presence of bubbles on the fiber surface. A judgment was made.

Examples 2 to 6 and Comparative Examples 1 to 2 In the same manner as in Example 1 except that the used polyester, the water absorbent resin and the amounts thereof were changed as shown in Table 2. The polyester fiber was treated. The hydrophilicity and hydrophilic durability of the obtained polyester fiber and the presence or absence of bubbles on the fiber surface were examined in the same manner as in Example 1. The results are shown in Table 2.

Among the water absorbent resins used, Aqualic CA and Aqualic CS are acrylic water absorbent resins, and Sunwet 1M is a grafted Demp water absorbent resin.

[0053]

[Table 2]

From the results shown in Table 2, the hydrophilicity improver for fibers containing the polyester and the water absorbent resin used in Examples 1 to 6 significantly improves the hydrophilicity and hydrophilic durability of the fibers. It can be seen that it is also excellent in terms of foam adhesion.

Example 7: 0.0045 g of the polyester obtained in Production Example 3 and 0.0 of AQUALIC CA ML-20 (particle diameter: about 20 μm)
005 g of the same polyester fiber as in Example 1 1.0 g
3,000 rp by adding to 1 liter of papermaking solution containing
Stir the propeller for 5 minutes at m and transfer to a glass beaker.
It was allowed to stand for a minute. Regarding the treated fiber, Example 1
When evaluated in the same manner as above, the hydrophilicity is 10 cm.
It was confirmed that a slight amount of bubbles adhered to the fiber. The hydrophilic durability was 7 cm, and the amount of second bubble adhesion was very small.

Comparative Example 3 0.0005 g of AQUALIC CA ML-20 was added to 1 liter of a papermaking solution containing 1.0 g of polyester fiber, and the same treatment as in Example 7 was carried out for evaluation.
The hydrophilicity of the fiber was -7 cm, the fiber floated on the liquid surface, and the amount of bubbles attached was small. The hydrophilic durability was −9 cm, the fibers floated on the liquid surface, and a large amount of foam adhesion was recognized on the fibers in the second degree of foam adhesion.

Example 8 Instead of the polyester obtained in Production Example 1 and Aqualic CA K-4 in Example 1, 18 g of the polyester obtained in Production Example 5 and Sunwet 1M-1000M are used.
Using a fiber treated in the same manner with 2 g of PS (particle size: about 40 μm), a paper was sampled using a TAPPI standard machine manufactured by Yasuda Seiki Co., Ltd. That is, the treated polyester fiber was tested so that the actual basis weight was 84 g / m ² and the binder polyester fiber (manufactured by Nippon Ester Co., Ltd., type 4080, fineness 2 denier, fiber length 10 mm) had a basis weight of 30 g / m ^2. Paper was made and dried at 130 ° C. to obtain a non-woven sheet (basis weight: 100 g / m ² ). In this example, since the hydrophilicity of the fiber is significantly improved, it is possible to uniformly disperse the fiber in water with light agitation, no bubbling problem is observed, the drainage rate is high, and the productivity is high. It was good. Further, the obtained polyester fiber sheet had a very uniform and even texture. The obtained nonwoven fabric was observed by an electron microscope and Na by EPMA. The results are shown in FIGS.

1 and 3 are electron micrographs (magnification of 7 × 10 ² times and 40 times) showing the shape of the fibers of the superabsorbent resin portion attached to the fibers on the surface of the nonwoven fabric.
From FIG. 1, it can be seen that the super absorbent polymer is attached to the fibers. 2 and 4 show the EPMA of Na showing the shape of the fibers of the superabsorbent resin portion attached to the fibers on the surface of the nonwoven fabric.
2 is a scanning electron micrograph by Since white appears when Na is present, it can be seen that Na is concentrated in each white portion in FIGS. 1 and 3. That is, N
It can be seen that the super absorbent polymer containing a is attached to the fiber.

Example 9 In Example 8, Sunwet 1M-1000MPS
Instead of 2 g of Oasis (fineness 1 denier, length 7 mm, manufactured by Technical Absorbent Co., Ltd.), which is an acrylic water-absorbent resin, was used in the same manner as in Example 8 to obtain a non-woven fabric sheet (basis weight 100 g / m 2. I got ² ). Also in this example, the fibers could be uniformly dispersed in water with stirring lighter than in Example 8, no problem of foaming was observed, the drainage rate was high, and the productivity was good. Furthermore, the obtained polyester fiber sheet had a very uniform and even texture.

Example 10 In Example 8, instead of the polyester obtained in Production Example 5 and Sunwet 1M-1000 MPS, Production Example 6 was used.
19 g of polyester and Aquaric CAK-4
A non-woven sheet (basis weight: 100 g / m ² ) was obtained in the same manner as in Example 8 except that 0.2 g was used. Also in this example, as in Example 8, the fibers could be uniformly dispersed in water, no problem of foaming was observed, the drainage rate was high, and the productivity was good. Further, the obtained polyester fiber sheet had a very uniform and even texture.

[0061]

EFFECT OF THE INVENTION The method for producing a hydrophilicity improver for fibers and a nonwoven fabric of the present invention significantly improves the hydrophilicity of fibers,
When a non-woven fabric is manufactured by the wet method, the fibers can be uniformly dispersed in water with light agitation, the solution viscosity can be suppressed to a low level, foaming can be reduced, the drainage speed can be increased, and a uniform and even texture can be obtained. It is possible to obtain a non-woven fabric. The nonwoven fabric of the present invention has a very uniform and excellent texture without spots.

[Brief description of drawings]

FIG. 1 is a scanning electron micrograph (enlargement magnification: 7 × 10 ² times) showing the shape of fibers in a superabsorbent resin portion attached to fibers on the surface of the nonwoven fabric obtained in Example 8.

FIG. 2 EPM of Na showing the shape of the fibers of the superabsorbent resin portion attached to the fibers on the surface of the nonwoven fabric obtained in Example 8
Scanning electron micrograph by A (enlargement magnification 7 × 10
² times).

FIG. 3 is a scanning electron micrograph (magnification of 40 times) showing the shape of the fibers of the superabsorbent resin portion attached to the fibers on the surface of the nonwoven fabric obtained in Example 8.

FIG. 4 is an EPM of Na showing the shape of the fibers of the superabsorbent resin portion attached to the fibers on the surface of the nonwoven fabric obtained in Example 8.
It is a scanning electron micrograph by A (magnification of 40 times).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nagayuki Numata 10-95-106 Mondo Nishimachi, Nishinomiya City, Hyogo Prefecture (72) Inventor Yoshikatsu Mizukami 1-6-1-408, Yubuchicho, Miyakojima-ku, Osaka

Claims (10)

[Claims] 1. A hydrophilicity-improving agent for fibers, comprising a polyester and a super absorbent polymer. 2. The hydrophilicity-improving agent for fibers according to claim 1, wherein the polyester is obtained by polycondensing a polyhydric alcohol and a polycarboxylic acid. 3. A polyester having a weight average molecular weight of 3,000.
The hydrophilicity-improving agent for fibers according to claim 1 or 2, which has 0 to 20,000. 4. The superabsorbent resin is an acrylic superabsorbent resin or a grafted starch-based superabsorbent resin.
The hydrophilicity improving agent for fibers described. 5. The hydrophilicity-improving agent for fibers according to claim 1, wherein the polyhydric alcohol is an alkylene oxide adduct of bisphenol sulfone or diethylene glycol. 6. The hydrophilicity-improving agent for fibers according to claim 1, wherein the polycarboxylic acid is isophthalic acid. 7. The hydrophilicity-improving agent for fibers according to claim 1, wherein at least a part of the terminal carboxyl groups of the polyester is esterified with a polyoxypropylene alkyl ether. 8. A non-woven fabric obtained by adhering a super absorbent polymer to the surface of fibers forming the non-woven fabric. 9. A method for producing a non-woven fabric by a wet method, comprising the step of treating the fiber with the hydrophilicity-improving agent for fibers according to claim 1, wherein the non-woven fabric has a water-absorbent resin adhered to the surface thereof. Manufacturing method. 10. The method for producing a nonwoven fabric according to claim 8, wherein the fibers are polyester fibers.