JP7084391B2 - Water-absorbing supplies for clothing - Google Patents

Description

The present invention relates to a water-absorbent polymer composition and a water-absorbent article and a fiber treatment agent containing the same. The present invention also relates to a method for producing the water-absorbent article.

Water-absorbent articles such as disposable diapers and menstrual napkins are usually placed between the liquid-permeable front sheet that comes into contact with the wearer's skin and the leak-proof back sheet that is placed on the clothing side. It has a liquid-retaining absorber. A water-absorbent polymer is exclusively used as the liquid-absorbing material of the absorber, which improves the absorption performance of the water-absorbent article and enables long-term wearing. The water-absorbent article is discarded after being used for a certain period of time by absorbing and holding the excrement while being worn by the wearer.

These water-absorbent articles are sufficiently satisfactory for users with a large amount of excretion, but users with a small amount of excretion may feel wearing stress due to their high water absorption capacity. .. In addition, since it has a high water absorption capacity, it tends to be bulky, which may cause anxiety that others may not notice that the article is worn. Furthermore, because it has a high water absorption capacity, it tends to be bulky, which causes inconvenience in carrying and storing goods, and during storage until disposal after use (for example, a garbage truck). (Until it arrives) There may be a lot of garbage in the house and you may be in trouble. Therefore, it is advantageous to be able to provide a water-absorbent article having a high water-absorbing capacity and a low bulk.

The techniques described in Patent Documents 1 and 2 are known as techniques for reducing the bulk of a composition containing a water-absorbent polymer. Patent Document 1 proposes a technique in which an aerosol-type antiperspirant composition contains a water-absorbent polymer and the antiperspirant composition is sprayed onto the skin to absorb sweat. Patent Document 2 proposes a technique of spraying an aqueous composition containing a water-absorbent resin having a specific average particle size.

Japanese Unexamined Patent Publication No. 3-109316 Japanese Unexamined Patent Publication No. 2013-199444

The techniques described in Patent Documents 1 and 2 are premised on applying a composition containing a water-absorbent polymer directly to the user's body. Therefore, it cannot be said that it is suitable for absorption and retention of excrement of body fluid such as urine and menstrual blood. Further, the techniques described in Patent Documents 1 and 2 absorb a small amount of sweat, and cannot be said to be suitable for absorbing a large amount of local sweat from the armpit or the like.

Therefore, an object of the present invention is to provide a technique capable of easily forming a water-absorbent article suitable for absorbing and retaining excrement of body fluid such as urine, menstrual blood, and sweat.

The present invention provides a water-absorbent polymer composition containing (A) a water-absorbent polymer and (B) a polymer other than the water-absorbent polymer that is soluble in a volatile solvent.

The present invention also provides a water-absorbent article and a fiber treatment agent containing the above-mentioned water-absorbent polymer composition.

The present invention also provides a water-absorbing product having the water-absorbent polymer composition and a spray container for accommodating the water-absorbent polymer composition.

Further, the present invention provides a method for producing a water-absorbent article, which comprises a step of treating a water-absorbent polymer composition containing a water-absorbent polymer on the surface of the wearable article in direct contact with the excretory portion of the wearer.

INDUSTRIAL APPLICABILITY According to the present invention, there is provided a water-absorbent polymer composition capable of easily forming a water-absorbent article by applying it to clothing such as a worn article that directly contacts the wearer's excretory part such as underwear. To.

Hereinafter, the present invention will be described based on the preferred embodiment thereof. The present invention relates to a water-absorbent polymer composition. The water-absorbent polymer composition of the present invention is generally fluid in its used state. By applying this to a garment, the water-absorbent polymer composition of the present invention acquires the absorption-retaining property of a liquid in the application area of the water-absorbent polymer composition in the garment, and simply absorbs water in the application area. It forms a sex article.

The water-absorbent polymer composition of the present invention contains (A) a water-absorbent polymer as one of its constituent components. The water-absorbent polymer is preferably a material that absorbs and retains water to form a swelling hydrogel, and for example, a polymer capable of absorbing water having a mass of 3 times or more, particularly 10 times or more its own weight is preferably used. Examples of water-absorbent polymers include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, sodium polyacrylate crosslinked polymer, (dempun-acrylic acid) graft copolymer, and (isobutylene-maleic anhydride). Examples thereof include polymers, saponified products thereof, and polyasparaginic acid. These water-absorbent polymers may be used alone or in combination of two or more.

The water-absorbent polymer (A) is generally in the shape of particles in the water-absorbent polymer composition of the present invention. The shape of the particles of the water-absorbent polymer includes, for example, a spherical type, a spherical aggregate type, a lump type, a bale type, and an amorphous type, and in the present invention, any shape can be used without particular limitation. .. The average particle size of the water-absorbent polymer is 1 μm or more from the viewpoint of preventing the water-absorbent polymer from falling off from the object treated with the surface treatment composition of the present invention and suppressing the flying of dust. It is preferably 10 μm or more, more preferably 20 μm or more, and even more preferably 20 μm or more. Further, the average particle size is preferably 100 μm or less, more preferably 90 μm or less, from the viewpoint of treatment efficiency to the surface-treated object and viscosity (possibility of ejection from the nozzle when sprayed). It is more preferably 50 μm or less. The average particle size of the particles of the water-absorbent polymer is preferably 1 μm or more and 100 μm or less, more preferably 10 μm or more and 90 μm or less, and further preferably 20 μm or more and 50 μm or less.

The average particle size of the water-absorbent polymer is measured by the laser diffraction method specified in JIS Z 8825: 2013.

The water-absorbent polymer (A) preferably has a water absorption amount of 5 g / g or more at 25 ° C. from the viewpoint of ensuring a sufficient liquid absorption capacity regardless of the shape thereof. It is more preferably 10 g / g or more, and even more preferably 20 g / g or more. Further, from the viewpoint of preventing the liquid from falling off due to swelling caused by absorption of the liquid, it is preferably 40 g / g or less, more preferably 37 g / g or less, and even more preferably 35 g / g or less. Specifically, the water-absorbent polymer (A) is preferably 5 g / g or more and 40 g / g or less, more preferably 10 g / g or more and 37 g / g or less, and 20 g / g at 25 ° C. It is more preferably 35 g / g or less.

The water absorption amount is measured according to JIS K 7223 (1996). Nylon woven fabric (sold by Sanriki Seisakusho, product name: nylon net, standard: 250 mesh) is cut into a rectangle with a width of 10 cm and a length of 40 cm, folded in half in the center of the longitudinal direction, and heat-sealed at both ends to a width of 10 cm. (Inner size 9 cm), make a nylon bag with a length of 20 cm. Next, 1.00 g of the water-absorbent polymer, which is a measurement sample, is precisely weighed and placed evenly in the bottom of the prepared nylon bag. Next, the nylon bag containing the sample is immersed in a physiological saline solution (0.9 mass% sodium chloride aqueous solution) whose temperature has been adjusted to 25 ° C. Then, one hour after the start of immersion, the nylon bag is taken out of the physiological saline solution, hung vertically for one hour to drain water, and then dehydrated using a centrifugal dehydrator (manufactured by Kokusan Co., Ltd., model H-130C special type). The dehydration condition is 143 G (800 rpm) for 10 minutes. After dehydration, the mass of the sample is measured, and the target water absorption amount is calculated according to the following formula.
Water absorption (g / g) = (a'-bc) / c
In the above formula, a'is the total mass (g) of the sample and the nylon bag after centrifugal dehydration, b is the mass (g) of the nylon bag before water absorption (during drying), and c is the mass of the sample before water absorption (during drying). Represents mass (g).
The measurement is performed 5 times (n = 5), the values at each of the upper and lower points are deleted, and the average value of the remaining 3 points is used as the measured value. The measurement is performed at 23 ± 2 ° C. and 50 ± 5% humidity, and the sample is stored in the same environment for 24 hours or more before the measurement.

It is preferable that the water-absorbent polymer (A) has low solubility in a volatile solvent described later from the viewpoint of keeping the water-absorbent polymer composition of the present invention stable. Taking ethanol as a volatile solvent as an example, the solubility of the water-absorbent polymer (A) in ethanol is preferably 5% by mass or less, more preferably 3% by mass or less at 25 ° C., and 1% by mass. % Or less is more preferable. This solubility may be zero. The volatile solvent referred to here is the (C) volatile solvent contained in the water-absorbent polymer composition of the present invention together with the water-absorbent polymer (A).

The solubility of the water-absorbent polymer (A) in a volatile solvent is measured by the following method. That is, in a closed container, 100 g of ethanol was added while stirring at 25 ° C. until the powder (A) was not dissolved even after stirring for 20 minutes, and the mass a1 (g) of the added (A) was added. After filtering the contents of the container with filter paper (manufactured by Advantech, No. 5c, 12 cm) and volatilizing the volatile solvent, the difference a1-a2 from the mass a2 (g) of (A) remaining on the filter paper. Using (g), the value calculated by (a1-a2) / a1 × 100 is defined as the solubility (% by mass).

The water-absorbent polymer composition of the present invention contains (B) a polymer that is soluble in a volatile solvent, in addition to the water-absorbent polymer (A). The polymer of (B) is a polymer other than the water-absorbent polymer of (A). The "polymer soluble in a volatile solvent" means that when 100 g of ethanol and 10 g of the polymer are mixed and stirred at 25 ° C. for 5 minutes at the operating temperature of the water-absorbent polymer composition of the present invention, they are contained in ethanol. It has solubility such that the mass of the remaining undissolved polymer is 0.1 g or less.

From the viewpoint of preventing exudation, the polymer (B) preferably has a solubility in water of 70% by mass or less at 25 ° C., more preferably 50% by mass or less, and more preferably 30% by mass or less. It is more preferably 10% by mass or less, and even more preferably 10% by mass or less. This solubility may be zero.

The polymer (B) has an action of fixing the water-absorbent polymer of (A) to the application area when the water-absorbent polymer composition of the present invention is applied to the application area. From this point of view, it is preferable that the polymer (B) has a binding ability capable of adhering the water-absorbent polymer (A) to clothing in addition to being dissolved in a volatile solvent as described above. .. As the polymer having such properties, it is preferable to use a polymer compound called a so-called binder in the field of polymer technology. Therefore, in the following description, the polymer (B) is also referred to as a "binder polymer".

In addition to the fact that the binder polymer (B) is preferably soluble in a volatile solvent consisting of an organic solvent, the proportion of the water-insoluble component measured at 25 ° C. in terms of solubility in water is 90% by mass. It is preferably less than or equal to, more preferably 70% by mass or less, further preferably 50% by mass or less, and even more preferably 30% by mass or less. This solubility may be zero.

The proportion of the water-insoluble component is measured by the following method. That is, 100 g of water is stirred at 25 ° C., 10 g of the polymer of (B) is added, and the mixture is stirred for 20 minutes. The substance remaining on the above is dried at 40 ° C. until it reaches a constant weight, the dry mass a3 (g) is measured, and a3 / 10 × 100 is defined as the proportion (% by mass) of the water-insoluble component.

As the binder polymer (B), one that is soluble in the above-mentioned volatile solvent is preferably used. Examples of such a polymer include a copolymer derived from an ethylenically unsaturated monomer. Examples of the ethylenically unsaturated monomer include olefins such as ethylene and propylene, aromatic vinyl compounds such as styrene, acrylic compounds such as acrylic acid and methacrylic acid, and halogen-based vinyl compounds such as vinyl chloride. Acrylic compounds selected from the group consisting of acrylic acid, acrylic acid salts, acrylic acid esters, acrylic acid amides, methacrylic acids, methacrylic acid salts, methacrylic acid esters and methacrylic acid amides as ethylenically unsaturated monomers. Is preferable from the viewpoint of solubility in a volatile solvent. The polymer (B) preferably has a structure derived from two or more of these ethylenically unsaturated monomers.

Another example of the binder polymer of (B) is a silicone copolymer. The silicone copolymer is a polymer compound having a main skeleton due to a siloxane bond, and has N-acylalkyleneimine, acrylic acid, a salt of acrylic acid, acrylic acid ester, acrylic acid amide, methacrylic acid, and methacrylic as copolymerizing components. A compound containing at least one of an acid salt, a methacrylic acid ester and a methacrylic acid amide in a molecular chain. Silicone copolymers are roughly classified into two types: physical crosslinks in which crosslink points are generated by physical interaction and chemical crosslinks in which crosslinks are linked by covalent bonds. In the present invention, it is preferable to use a physically crosslinked body. The reason for this is that the physically crosslinked product is more easily dissolved in a volatile solvent than the chemically crosslinked product.

Examples of the physically crosslinked silicone copolymer include poly (N-acylalkyleneimine) -modified silicone, sugar-modified silicone (Japanese Patent Laid-Open No. 63-139106), and polyglycerin-modified silicone (Japanese Patent Laid-Open No. 2004-339244). , Polyamino acid-modified silicone (Japanese Patent Laid-Open No. 2002-145724), silicone graft acrylate polymer (Japanese Patent Laid-Open No. 4-342513), silicone PEG block polymer (Japanese Patent Laid-Open No. 4-234307) and the like are exemplified. Of these, it is preferable to use poly (N-acylalkyleneimine) -modified silicone because of its high solubility in a volatile solvent.

The poly (N-acylalkyleneimine) -modified silicone described above has, for example, a segment of the formula poly (N-acylalkyleneimine) and a segment of an organopolysiloxane in the molecule, and the end of the segment of the organopolysiloxane. Alternatively, it is preferable that the poly (N-acylalkyleneimine) segment is bonded to at least one of the silicon atoms in the side chain via an alkylene group containing a hetero atom. As the alkylene group containing a hetero atom present at at least one of the silicon atoms at the end or side chain of the segment of the organopolysiloxane, the alkylene group contains 1 to 3 nitrogen atoms, oxygen atoms or sulfur atoms and has 2 to 20 carbon atoms. Alkylene group of.

Specific examples of the preferred poly (N-acylalkyleneimine) -modified silicone include poly (N-formylethyleneimine) -modified silicone, poly (N-acetylethyleneimine) -modified silicone, and poly (N-propionylethyleneimine) -modified. Examples include silicone. Among them, the poly (N-propionylethyleneimine) segment represented by the formula (2) having a weight average molecular weight of about 20,000 to 200,000 and a proportion of poly (N-propionylethyleneimine) segment in the molecule is about 3 to 50% by mass. N-propionylethyleneimine) modified silicone (INCI name: Polysilicone-9; elastomer OS (trade name of Kao Corporation)) is preferable.

The water-absorbent polymer composition of the present invention contains the above-mentioned water-absorbent polymer (A) in an amount of 5% by mass or more, particularly 10% by mass or more, particularly 15% by mass or more. It is preferable from the viewpoint of improving the water absorption performance after the treatment with. Further, it is preferable that the content is 30% by mass or less, particularly 25% by mass or less, particularly 20% by mass or less, from the viewpoint of treatment efficiency on the surface-treated object and ejection property from the nozzle when sprayed. The water-absorbent polymer composition of the present invention preferably contains the water-absorbent polymer (A) in an amount of 5% by mass or more and 30% by mass or less, particularly 10% by mass or more and 25% by mass or less, and particularly preferably 15% by mass or more and 20% by mass or less. ..

When the water-absorbent polymer composition of the present invention contains the above-mentioned binder polymer (B) in an amount of 0.1% by mass or more, particularly 0.2% by mass or more, particularly 0.5% by mass or more, the reversion of the liquid is suppressed. It is preferable from the viewpoint of Further, it is preferable that the content is 10% by mass or less, particularly 2% by mass or less, particularly 1% by mass or less, from the viewpoint of suppressing water absorption inhibition. The water-absorbent polymer composition of the present invention contains the binder polymer (B) in an amount of 0.1% by mass or more and 10% by mass or less, particularly 0.2% by mass or more and 2% by mass or less, and particularly 0.5% by mass or more and 1% by mass or less. It is preferable to include the following.

In the water-absorbent polymer composition of the present invention, the ratio of the water-absorbent polymer of (A) to the binder polymer of (B) described above is [the mass of the water-absorbent polymer of (A) / the binder polymer of (B). In terms of the value of [mass], it is preferably 0.5 or more, particularly 3 or more, particularly 5 or more, from the viewpoint of water absorption. Further, the value of [mass of (A) water-absorbent polymer / mass of (B) binder polymer] is preferably 300 or less, particularly 60 or less, particularly 25 or less, from the viewpoint of suppressing the reversion of the liquid. .. Specifically, the value of [mass of (A) water-absorbent polymer / mass of (B) binder polymer] is 0.5 or more and 300 or less, particularly 5 or more and 60 or less, and particularly 5 or more and 25 or less. Is preferable.

The water-absorbent polymer composition of the present invention may contain, in addition to the above-mentioned water-absorbent polymer (A) and the binder polymer (B), a volatile solvent capable of dissolving the binder polymer. The volatile solvent is preferably contained in an amount sufficient to dissolve the entire amount of the binder polymer (B) contained in the water-absorbent polymer composition of the present invention. Generally speaking, it is preferable that 100 parts by mass or more of the binder polymer (B) contains a volatile solvent of 400 parts by mass or more, particularly 900 parts by mass or more, particularly 1900 parts by mass or more. As described above, the volatile solvent may be used alone or in combination of two or more.

(C) The volatile solvent refers to a substance having a saturated vapor pressure of 3000 Pa or more at the operating temperature of the water-absorbent polymer composition. Examples of the volatile solvent include water and an organic solvent, but it is preferable to use a solvent that is not absorbed by the water-absorbent polymer (A). From this point of view, it is advantageous that the volatile solvent is an organic solvent. Examples of volatile solvents composed of organic solvents include alcohols, esters, nitriles, ethers, hydrocarbons, ketones and the like. One of these volatile solvents can be used alone, or two or more of them can be used in combination. When two or more kinds of volatile solvents are used in combination, the saturated vapor pressure is the saturated vapor pressure of the volatile solvent having the lowest saturated vapor pressure among the plurality of volatile solvents used. Among these volatile solvents, water, alcohol, ether and LPG (mixture of propane and butane) are preferable from the viewpoint of achieving both solubility of the polymer and drying time, and the group consists of water, ethanol, dimethyl ether and LPG. It is more preferable to use one selected or a combination of two or more.

When alcohol is used as the volatile solvent, it is preferable to use a monovalent or polyvalent aliphatic alcohol having 1 or more and 5 or less carbon atoms. In particular, it is preferable to use a monohydric alcohol having 1 or more and 3 or less carbon atoms, such as methanol, ethanol and propanol. When an ester is used as a volatile solvent, an ester of a monovalent or polyvalent aliphatic alcohol having 1 or more and 4 or less carbon atoms and a monovalent or polyvalent fatty acid having 1 or more and 4 or less carbon atoms. It is preferable to use. In particular, it is preferable to use an ester of a monohydric fatty alcohol having 1 or more and 2 or less carbon atoms and a monovalent fatty acid having 1 or more and 3 or less carbon atoms, such as ethyl acetate and methyl propionate. When nitrile is used as the volatile solvent, it is preferable to use nitrile of an alkane having 2 or more and 3 or less carbon atoms, for example, acetonitrile.

The water-absorbent polymer composition of the present invention can impart liquid absorption retention to the application site, for example, by applying the composition to the clothing of the user. Thereby, the water-absorbent polymer composition of the present invention is used, for example, as a urine absorbent. Alternatively, the surface treatment composition of the present invention is used as a sweat absorbent. Further, the water-absorbent polymer composition of the present invention is used as a blood absorbent. Further, the water-absorbent polymer composition of the present invention is used as a fiber treatment agent. Regardless of the purpose of use, by using the water-absorbent polymer composition of the present invention, a wearable article that directly abuts on the excretory part of the wearer is applied as a garment, and the wearer in the wearable article is applied. A water-absorbent article can be easily produced from the worn article by a method having a step of treating a portion directly in contact with the excretory portion with the water-absorbent polymer composition of the present invention. As described above, the water-absorbent polymer composition of the present invention is treated with various application objects to impart liquid absorbability to the application objects. Of course, the water-absorbent polymer composition of the present invention may be contained in the water-absorbent body of a general water-absorbent article. Common water-absorbent articles include, for example, adhesive plasters, disposable diapers, sweat pads, urine pads, menstrual napkins, panty liners, and pantyliner sheets.

The water-absorbent polymer composition of the present invention is applied to an object to which it is applied by various methods. For example, the water-absorbent polymer composition of the present invention can be sprayed and treated on the object to be applied. Alternatively, by immersing the application object in the water-absorbent polymer composition of the present invention, the composition can be treated into the application object. Further, the water-absorbent polymer composition of the present invention can be treated on an object to be applied by using various coating devices such as a die coater and a slot coater. What kind of application method should be adopted may be appropriately determined according to the properties of the water-absorbent polymer composition of the present invention, the shape of the object to be applied, and the like. When the water-absorbent polymer composition of the present invention is applied to an object, a volatile solvent is volatilized from the composition, and as a result, a film composed of the binder polymer of (B) is formed. This film stably holds the water-absorbent polymer (A) on the object.

Regardless of the type of object to which the water-absorbent polymer composition of the present invention is applied, the amount to which the composition is applied is generally 1 g / g / from the viewpoint of liquid absorption retention and suppression of liquid reversion. It is preferably m ² or more, more preferably 5 g / m ² or more, and even more preferably 10 g / m ² or more. Further, from the viewpoint of ease of treatment and detergency, it is preferably 30 g / m ² or less, more preferably 20 g / m ² or less, and even more preferably 15 g / m ² or less. Specifically, the amount of the water-absorbent polymer composition of the present invention applied to the object is preferably 1 g / m ² or more and 30 g / m ² or less, and 5 g / m ² or more and 20 g / m ² or less. Is more preferable, and it is more preferable that it is 10 g / m ² or more and 15 g / m ² or less.

When the water-absorbent polymer composition of the present invention is treated by spraying on an object to be applied such as clothing or a water-absorbent article, the composition is contained in a spray container, and the composition is applied from the spray container to the object to be applied. You can spray it on. That is, a water-absorbing product having a water-absorbent polymer composition of the present invention and a spray container containing the water-absorbent polymer composition may be used. For the purpose of spraying the water-absorbent polymer composition of the present invention using this water-absorbing product, the spray container may contain a propellant in addition to the water-absorbent polymer composition of the present invention. preferable. As the propellant, those conventionally used for spray containers can be used without particular limitation. Examples of the propellant include LPG, dimethyl ether (DME), carbon dioxide gas, nitrogen gas, and a mixture thereof. Of these, LPG and dimethyl ether (DME) are preferable. Alternatively, an alternative chlorofluorocarbon such as HFC-152a can be used. The amount of the propellant contained in the spray container is the mass ratio of the water-absorbent polymer composition of the present invention, which is the undiluted solution, to the propellant. The range of 98: 2 is preferable, and the range of 90:10 to 95: 5 is more preferable. Further, it is preferable to adjust the type and content of the propellant so that the pressure in the spray container becomes 0.15 to 0.55 MPa at 25 ° C.

As described above, the water-absorbent polymer composition of the present invention absorbs liquid into the applicable area by applying the composition to various clothing items such as underwear, which are in direct contact with the excretory part of the wearer. Retention can be imparted. In other words, the applicable area can be an absorber of a water-absorbent article. As described above, the water-absorbent polymer composition of the present invention can easily turn clothing into a water-absorbent article. The water-absorbent article thus obtained effectively prevents the liquid excreted from the wearer from seeping into the outerwear (for example, trousers, slacks, pants, etc.), and effectively reverts the liquid. It will prevent it.

When the water-absorbent polymer composition of the present invention is applied to underwear, which is clothing that comes into direct contact with the user's skin, for example, the outer surface side of the underwear, that is, the surface side far from the user's skin and the inner surface side, That is, the composition can be treated on either or both of the surfaces close to the user's skin. In particular, it is preferable to treat the outer surface side of the underwear surface, that is, the surface side far from the user's skin, because the amount of liquid return and the amount of liquid exudation are further reduced. .. Specifically, the liquid excreted on the inner surface side of the underwear permeates the cloth constituting the underwear and reaches the outer surface side of the underwear, and the outer surface side is contained in the water-absorbent polymer composition of the present invention. Since the water-absorbent polymer is attached, the liquid is absorbed by the water-absorbent polymer and the liquid does not easily revert. Further, the liquid that reaches the outer surface side of the underwear is hindered from further movement by the film formed by the binder polymer contained in the water-absorbent polymer composition of the present invention, and the liquid is less likely to seep out.

Regarding the above-described embodiment, the present invention further discloses the following water-absorbent polymer composition and a water-absorbent article containing the same.
<1>
A water-absorbent polymer composition comprising (A) a water-absorbent polymer and (B) a polymer other than the water-absorbent polymer and soluble in a volatile solvent.

<2>
The water-absorbent polymer composition according to <1>, wherein the average particle size of the water-absorbent polymer (A) is 1 μm or more and 100 μm or less.
<3>
The water-absorbent polymer composition according to <1> or <2>, which contains 5% by mass or more and 30% by mass or less of the water-absorbent polymer (A).
<4>
The water-absorbent polymer according to any one of <1> to <3>, wherein the polymer dissolved in the volatile solvent of (B) is a copolymer derived from an ethylenically unsaturated monomer or a silicone copolymer. Composition.
<5>
The polymer (B) does not remain in ethanol when 100 g of ethanol and 10 g of the polymer of (B) are mixed and stirred at 25 ° C. for 5 minutes at the operating temperature of the water-absorbent polymer composition. The water-absorbent polymer composition according to any one of <1> to <4>, which has a solubility in which the mass of the dissolved polymer (B) is 0.1 g or less.

<6>
The water-absorbent polymer composition according to any one of <1> to <5>, wherein the polymer (B) has a solubility in water of 70% by mass or less at 25 ° C.
<7>
The water-absorbent polymer composition according to any one of <1> to <6>, wherein the polymer (B) has a water-insoluble component ratio of 90% by mass or less measured at 25 ° C.
<8>
The water-absorbent polymer composition according to any one of <1> to <7>, which contains the polymer (B) in an amount of 0.1% by mass or more and 10% by mass or less.
<9>
The water-absorbent polymer composition according to any one of <1> to <8>, wherein the value of [mass of (A) water-absorbent polymer / mass of (B) polymer] is 0.5 or more and 300 or less. thing.
<10>
(C) The water-absorbent polymer composition according to any one of <1> to <9>, which further contains (C) a volatile solvent.

<11>
(C) The water-absorbent polymer composition according to <10>, which contains 400 parts by mass or more of a volatile solvent with respect to 100 parts by mass of the polymer of (B).
<12>
The water-absorbent polymer composition according to <10> or <11>, wherein the volatile solvent (C) has a saturated vapor pressure of 3000 Pa or more at the operating temperature of the water-absorbent polymer composition.
<13>
A fiber treatment agent containing the water-absorbent polymer composition according to any one of <1> to <12>.
<14>
A water-absorbing product comprising the water-absorbent polymer composition according to any one of <1> to <12> and a spray container containing the water-absorbent polymer composition.
<15>
A method for producing a water-absorbent article, which comprises a step of treating the surface of the wearable article in direct contact with the excretory portion of the wearer with the water-absorbent polymer composition according to any one of <1> to <12>.

<16>
The method for producing a water-absorbent article according to <15>, wherein the amount of the water-absorbent polymer composition applied is 1 g / m ² or more and 30 g / m ² or less.
<17>
A method for producing a water-absorbent article, which comprises a step of spraying the water-absorbent polymer composition according to any one of <1> to <12> onto a wearable article that comes into direct contact with the excretory portion of the wearer.
<18>
A water-absorbent article containing the water-absorbent polymer composition according to any one of <1> to <12>.

Hereinafter, the present invention will be described in more detail by way of examples. However, the scope of the invention is not limited to such examples. Prior to the description of the examples, Synthesis Examples 1 and 2 will be described.

Synthesis Example 1: Preparation of copolymer composition (binder polymer) derived from ethylenically unsaturated monomer
It was obtained by mixing a (acrylamide / DMAPA acrylate / methoxy methacrylate PEG) copolymer and a (acrylamide / alkyl acrylate / DMAPA acrylate / methoxy methacrylate PEG) copolymer at a mass ratio of 1: 1.
The (acrylamide / acrylate DMAPA / methacrylic acid methoxyPEG) copolymer was synthesized according to the method described in JP-A-8-291206. Here, the mass ratio of the N-tert-butylacrylamide / dimethylacrylamide / dimethylaminopropylacrylamide / methoxypolyethylene glycol (PEG400) methacrylate copolymer was set to 52/25/2/21.
The (acrylamide / alkyl acrylate / DMAPA acrylate / methoxy methacrylic acid PEG) copolymer was synthesized according to the method described in JP-A-2-180911. Here, the mass ratio of the N-tert-butyl acrylamide / ethyl acrylate / N, N-dimethylaminopropyl acrylamide / polyethylene glycol methacrylate copolymer was set to 55/20/15/10.

Synthesis Example 2: Synthesis of poly (N-acylalkyleneimine) modified silicone (binder polymer) 6.5 parts of diethyl sulfate and 100.0 parts of 2-ethyl-2-oxazoline are dissolved in 200.0 parts of dehydrated ethyl acetate. Then, the mixture was heated and refluxed for 5 hours under a nitrogen atmosphere to obtain terminal-reactive poly (N-propionylethyleneimine). To this, 100.0 parts of a 50% ethyl acetate solution having a side chain primary aminopropyl-modified polydimethylsiloxane (molecular weight 110,000; amine equivalent (g / mol) 4,840) was added all at once, and heated and refluxed for 10 hours. did. The reaction mixture was concentrated under reduced pressure to make a poly (N-propionylethyleneimine) dimethylsiloxane copolymer (segment (A) / segment (B) = 50/50) (hereinafter referred to as poly (N-acylalkyleneimine) modified silicone). Was obtained as a pale yellow rubbery solid. The polystyrene-equivalent weight average molecular weight of this product was 109,000 (by gel permeation chromatography using chloroform as a developing solvent). Also, as a solvent by metalnography). In addition, as a result of neutralization titration with hydrochloric acid using methanol as a solvent, it was confirmed that no amino group remained.

[Examples 1 to 4 and comparative examples]
The components shown in Table 1 below were contained in a spray container at the ratio shown in the same table to produce a water-absorbing product. Using the obtained water-absorbent-imparting product, the water-absorbent polymer composition was sprayed on a cloth (65% polyester, 35% cotton, woven fabric, basis weight 150 g / m ² , size 10 cm × 10 cm) as model clothing. The spraying was performed for 1 second with the distance between the cloth and the spray nozzle of the spray container set to 20 cm. After this spraying, it was dried overnight to obtain a water-absorbent article. In addition, the comparative example was evaluated using an untreated cloth which was not sprayed with the water-absorbent polymer composition.

Details of the components shown in Table 1 are shown below.
Water-absorbent polymer A: Trade name "Aquakeep 10SH-NF" (manufactured by Sumitomo Seika Chemical Co., Ltd., (meth) acrylic in the constituent monomer; acid ratio; 100.0 mol%, average particle size; 25 μm, water absorption: 36 g / g), solubility in ethanol; 0 g

Binder polymer A: Copolymer derived from ethylenically unsaturated monomer (Synthesis Example 1)
Binder polymer B: Poly (N-acylalkyleneimine) -modified silicone of Synthesis Example 2)
Both the binder polymers A and B were dissolved in 100 g of ethanol, which is a volatile solvent, in an amount of 10 g or more and were insoluble in water (solubility in water at 25 ° C.: 0.0% by mass, water-insoluble component: 100.0% by mass). ).

For the obtained water-absorbent article, the exudation rate of the liquid, the water absorption rate of the liquid, and the return rate of the liquid were measured by the following methods. These results are shown in Table 1.

[Liquid exudation rate, liquid water absorption rate and liquid return rate]
The first filter paper (manufactured by Advantech, No. 5c, 12 cm) was placed on a horizontal table, and the cloths of Examples and Comparative Examples were placed on the filter paper so that the coated surface of the cloth was facing down. .. Under this condition, 0.5 mL of a blue-colored saline solution (manufactured by Otsuka Pharmaceutical Co., Ltd.) was added dropwise to the upper surface of the cloth. Immediately after dripping, a second filter paper (manufactured by Advantech, No. 5c, 12 cm) is placed on it, and an acrylic plate having a bottom area larger than the area covering the dropped area is placed on it, which corresponds to the mounting pressure. A pressure of 3 g / cm ² was applied over 30 seconds. The first filter paper is intended for outerwear (trousers), the treated cloth is intended for underwear, and the second filter paper is intended for the user's skin.

Next, the acrylic plate was removed, and the mass of the first filter paper before and after the dropping of the physiological saline was measured, and the change in mass was determined. This value is taken as the amount of liquid exudation. In addition, the mass of the cloth before and after the dropping of the physiological saline was measured, and the change in the mass was determined. This value is taken as the amount of water absorbed by the liquid. Further, the mass of the second filter paper before and after the dropping of the physiological saline was measured, and the change in the mass was determined. This value is used as the liquid return amount. The ratio of the liquid exudation amount, the liquid water absorption amount or the liquid return amount to the total value of the liquid exudation amount, the liquid water absorption amount and the liquid return amount is the liquid exudation rate (%) and the liquid water absorption rate. It was calculated as (%) and the liquid return rate (%), respectively.

As is clear from the results shown in Table 1, it can be seen that the cloth treated with the water-absorbent polymer composition obtained in each example has a large amount of water absorption and a small amount of liquid return and liquid exudation. .. Therefore, the cloth to which the water-absorbent polymer composition obtained in each example is applied is useful as a water-absorbent article.

Claims (5)

A water-absorbent polymer composition containing (A) a water-absorbent polymer, (C) a volatile solvent, and (B) a polymer other than the water-absorbent polymer that is soluble in the volatile solvent, and the water-absorbent polymer composition. A water-absorbing product for clothing that has a spray container for storing things.
The volatile solvent of (C) is contained in an amount of 400 parts by mass or more with respect to 100 parts by mass of the polymer of (B).
The volatile solvent (C) has a saturated vapor pressure of 3000 Pa or more at the operating temperature of the water-absorbent polymer composition, and has a saturated vapor pressure of 3000 Pa or more.
Among the copolymerization components, the polymer (B) includes N-acylalkyleneimine, acrylic acid, a salt of acrylic acid, an acrylic acid ester, an acrylic acid amide, a methacrylic acid, a salt of methacrylic acid, a methacrylic acid ester and a methacrylic acid amide. A water-absorbing product for clothing, which is a silicone copolymer containing at least one kind in its molecular chain. The water-absorbing product for clothing according to claim 1, wherein the water-absorbent polymer (A) has an average particle size of 1 μm or more and 100 μm or less. The volatile solvent of (C) is ethanol,
The solubility of the water-absorbent polymer (A) in ethanol is 5% by mass or less at 25 ° C.
The polymer (B) is dissolved in which the mass of the undissolved polymer remaining in ethanol is 0.1 g or less when 100 g of ethanol and 10 g of the polymer are mixed and stirred at 25 ° C. for 5 minutes. The water-absorbing product for clothing according to claim 1 or 2 , which has a property. The wearer comprising the step of treating the surface of the wearable article in direct contact with the excretory portion of the wearer with the water-absorbent polymer composition for clothing by the water-absorbent-imparting product for clothing according to any one of claims 1 to 3 . How to prevent the liquid excreted from the outer wear from seeping out. The water-absorbent polymer composition for clothing according to any one of claims 1 to 3 is excreted from the wearer, which comprises a step of spraying the water-absorbent polymer composition onto the wearable article in direct contact with the excretion portion of the wearer. How to prevent the liquid from seeping into the outer wear.