JPWO2018225251A1 - Water-absorbing polymer composition and water-absorbing article containing the same - Google Patents

Abstract

The water-absorbent polymer composition of the present invention includes (A) a water-absorbent polymer, and (B) a polymer other than the water-absorbent polymer, which is soluble in a volatile solvent. The average particle diameter of the water-absorbent polymer (A) is preferably 1 μm or more and 100 μm or less. It is also preferable that the polymer (B) soluble in the volatile solvent is a copolymer derived from an ethylenically unsaturated monomer or a silicone copolymer. The water absorbing article of the present invention has the water absorbing polymer composition and a spray container containing the water absorbing polymer composition.

Description

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

  A water-absorbent article such as a disposable diaper or a sanitary napkin is usually disposed between a liquid-permeable top sheet in contact with the wearer's skin and a leak-proof back sheet disposed on the clothes side, and both sheets. And a liquid-retentive absorber. A water-absorbing polymer is exclusively used as a liquid-absorbing material of the absorber, whereby the absorbing performance of the water-absorbing article is improved, and the article can be worn for a long time. The water-absorbent article is discarded after being used for a certain period of time while absorbing and holding the excreted liquid while being worn on the wearer.

  These water-absorbing articles are sufficiently satisfactory for users with a large amount of excretion, but may be worn by users with a small amount of excretion 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 of its high water absorption capacity, it tends to be bulky, which causes inconvenience in carrying and storing articles, and storage of goods after use (eg, garbage trucks). Garbage can increase in the house). Therefore, it is advantageous to be able to provide a water-absorbing article having a high water absorption capacity and a low bulk.

  As techniques for reducing the bulk of a composition containing a water-absorbing polymer, those described in Patent Documents 1 and 2 are known. Patent Literature 1 proposes a technique in which a water-absorbing polymer is contained in an aerosol-type antiperspirant composition, and the antiperspirant composition is sprayed on the skin to absorb sweat. Patent Document 2 proposes a technique of spraying an aqueous composition containing a water-absorbing resin having a specific average particle size.

JP-A-3-109316 JP 2013-94444 A

  The techniques described in Patent Documents 1 and 2 are based on the premise that a composition containing a water-absorbing polymer is directly applied to a user's body. Therefore, it is not suitable for absorbing and retaining bodily fluid excretions such as urine and menstrual blood. Furthermore, the techniques described in Patent Documents 1 and 2 absorb a small amount of perspiration, and cannot be said to be suitable for absorbing a large amount of local perspiration from the armpits or the like.

  Accordingly, an object of the present invention is to provide a technique capable of easily forming a water-absorbing article suitable for absorbing and retaining excretion of bodily fluids such as urine, menstrual blood, and sweat.

  The present invention provides a water-absorbing polymer composition comprising (A) a water-absorbing polymer and (B) a polymer other than the water-absorbing polymer, which is soluble in a volatile solvent.

  The present invention also provides a water-absorbing article and a fiber treating agent containing the water-absorbing polymer composition.

  The present invention also provides a water-absorbing article comprising the water-absorbing polymer composition and a spray container containing the water-absorbing polymer composition.

  Further, the present invention provides a method for producing a water-absorbent article, comprising a step of treating a surface of a wearable article which directly contacts the excretory part of a wearer with a water-absorbent polymer composition containing the water-absorbent polymer.

  According to the present invention, there is provided a water-absorbing polymer composition that can easily form a water-absorbing article by applying to clothing such as a wearing article that directly contacts an excretory portion of a wearer such as underwear. You.

  Hereinafter, the present invention will be described based on preferred embodiments. The present invention relates to a water-absorbing polymer composition. The water-absorbing polymer composition of the present invention is generally fluid in the state of use. The water-absorbing polymer composition of the present invention, when applied to clothing, allows the application area of the water-absorbing polymer composition in the clothing to acquire liquid absorption and retention properties, and provides simple water absorption in the application area. To form a sexual article.

  The water-absorbing polymer composition of the present invention contains (A) a water-absorbing polymer as one of its constituent components. The water-absorbing polymer is preferably a material that forms a hydrogel that absorbs and retains water to swell. 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 the water-absorbing polymer include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, sodium polyacrylate crosslinked product, (starch-acrylic acid) graft copolymer, and (isobutylene-maleic anhydride) copolymer. Examples thereof include polymers and saponified products thereof, and polyaspartic acid. One of these water-absorbing polymers may be used alone, or two or more thereof may be used in combination.

  The water-absorbing polymer (A) is generally in the form of particles in the water-absorbing polymer composition of the present invention. The shape of the particles of the water-absorbing polymer includes, for example, a spherical type, a spherical aggregation type, a lump type, a bale type, and an amorphous type. In the present invention, any shape can be used without particular limitation. . The water-absorbing polymer has an average particle diameter of 1 μm or more from the viewpoint of preventing the water-absorbing polymer from falling off from the object treated with the surface treatment composition of the present invention and suppressing the formation of dust. It is more preferably at least 10 μm, even more preferably at least 20 μm. In addition, the average particle size is preferably 100 μm or less, more preferably 90 μm or less, from the viewpoint of processing efficiency and viscosity (possibility of ejection from a nozzle when sprayed) on the surface treatment target object, More preferably, it is 50 μm or less. The average particle size of the water-absorbing polymer particles is preferably 1 μm or more and 100 μm or less, more preferably 10 μm or more and 90 μm or less, and even more preferably 20 μm or more and 50 μm or less.

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

  Regardless of the shape of the water-absorbing polymer (A), the water absorption is preferably 5 g / g or more at 25 ° C. from the viewpoint of securing a sufficient liquid absorption capacity. , More preferably at least 10 g / g, even more preferably at least 20 g / g. In addition, from the viewpoint of not falling off due to swelling due to liquid absorption, the amount 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-absorbing polymer (A) at 25 ° C preferably has a weight of 5 g / g to 40 g / g, more preferably 10 g / g to 37 g / g, and even more preferably 20 g / g. More preferably, it is 35 g / g or less.

The water absorption is measured in accordance with JIS K 7223 (1996). Nylon woven cloth (sold by Sanriki Seisakusho, product name: nylon net, standard: 250 mesh) is cut into a rectangle having a width of 10 cm and a length of 40 cm, folded in two in the longitudinal center, and heat-sealed at both ends to a width of 10 cm. A nylon bag having an inner size of 9 cm and a length of 20 cm is prepared. Next, 1.00 g of the water-absorbing polymer, which is a measurement sample, is precisely weighed and uniformly placed in the bottom of the prepared nylon bag. Next, the nylon bag containing the sample is immersed in a physiological saline solution (0.9% by mass aqueous sodium chloride solution) adjusted to 25 ° C. Then, one hour after the start of immersion, the nylon bag is taken out of the physiological saline, suspended in a vertical state for one hour, drained, and then dehydrated using a centrifugal dehydrator (model H-130C, manufactured by Kokusan Co., Ltd.). 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 is calculated according to the following equation.
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 (when dry), and c is the mass before water absorption of the sample (when dry). Represents mass (g).
The measurement is performed five times (n = 5), the value at each of the upper and lower points is deleted, and the average value of the remaining three points is used as the measured value. The measurement is performed at 23 ± 2 ° C. and a humidity of 50 ± 5%, and the sample is stored for at least 24 hours in the same environment before the measurement.

  It is preferable that the water-absorbing polymer (A) has low solubility in a volatile solvent described below from the viewpoint of keeping the water-absorbing polymer composition of the present invention stable. Taking ethanol as an example of the volatile solvent, the solubility of the water-absorbing 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. % Is more preferable. This solubility may be zero. In addition, the volatile solvent referred to here is the volatile solvent (C) contained in the water-absorbing polymer composition of the present invention together with the water-absorbing polymer (A).

  The solubility of the water-absorbing polymer (A) in the volatile solvent is measured by the following method. That is, while stirring 100 g of ethanol at 25 ° C. in a closed container, powder (A) was added until it was not dissolved even after stirring for 20 minutes, and the mass a1 (g) of the added (A) was added; The content of the container was filtered through filter paper (manufactured by Advantech, No. 5c, 12 cm), and after evaporating 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-absorbing polymer composition of the present invention contains (B) a polymer soluble in a volatile solvent in addition to the water-absorbing polymer of (A). The polymer of (B) is a polymer other than the water-absorbing polymer of (A). “Polymer soluble in volatile solvent” refers to a mixture of 100 g of ethanol and 10 g of polymer at the use temperature of the water-absorbing polymer composition of the present invention and stirring at 25 ° C. for 5 minutes. The solubility of the remaining undissolved polymer is 0.1 g or less.

  From the viewpoint of preventing seepage, the polymer (B) preferably has a solubility in water of not more than 70% by mass at 25 ° C, more preferably not more than 50% by mass, and more preferably not more than 30% by mass. More preferably, it is even more preferably 10% by mass or less. This solubility may be zero.

  The polymer (B) has an effect of fixing the water-absorbing polymer (A) to the application area when the water-absorbent polymer composition of the present invention is applied to the application area of clothing. From this viewpoint, the polymer (B) preferably has a binding ability to fix the water-absorbing polymer (A) to clothing in addition to dissolving in the volatile solvent as described above. . As a polymer having such properties, it is preferable to use a polymer compound called a so-called binder in the technical field of polymers. Therefore, in the following description, the polymer (B) is also referred to as “binder polymer”.

  The binder polymer (B) is preferably soluble in a volatile solvent composed of an organic solvent. In addition, regarding the solubility in water, the proportion of the water-insoluble component measured at 25 ° C. is 90% by mass. It is preferably at most 70 mass%, more preferably at most 70 mass%, even more preferably at most 50 mass%, even more preferably at most 30 mass%. This solubility may be zero.

  The ratio of the water-insoluble component is measured by the following method. That is, 10 g of the polymer (B) was added to 100 g of water while stirring at 25 ° C., and the mixture was stirred for 20 minutes, and the contents of the container were filtered using a filter paper (Advantech, No. 5c, 12 cm). The substance remaining on the top is dried at 40 ° C. until a constant weight is obtained, the dried mass a3 (g) is measured, and a3 / 10 × 100 is defined as the ratio (% by mass) of the water-insoluble component.

  As the binder polymer (B), those which can be dissolved in the above-mentioned volatile solvents are suitably 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. As the ethylenically unsaturated monomer, acrylic acid, an acrylic compound selected from the group consisting of acrylic acid salts, acrylic acid esters, acrylic acid amides, methacrylic acid, methacrylic acid salts, methacrylic acid esters and methacrylic acid amides Is preferred 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 (B) is a silicone copolymer. The silicone copolymer is a polymer compound having a main skeleton formed by a siloxane bond, and has N-acylalkyleneimine, acrylic acid, a salt of acrylic acid, an acrylic ester, an acrylamide, a methacrylic acid, a methacrylic acid as a copolymer component. It is a compound containing at least one of an acid salt, a methacrylic ester and a methacrylamide in a molecular chain. The silicone copolymers are roughly classified into two types: physical cross-linkers in which cross-linking points are generated by physical interaction, and chemical cross-linkers 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 soluble 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 (JP-A-63-139106), and polyglycerin-modified silicone (JP-A-2004-339244). And silicone modified with polyamino acid (JP-A-2002-145724), silicone graft acrylate polymer (JP-A-4-342513), and silicone PEG block polymer (JP-A-4-234307). Of these, use of a poly (N-acylalkyleneimine) -modified silicone is preferred because of its high solubility in volatile solvents.

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

  Specific examples of preferable poly (N-acylalkylenimine) -modified silicone include poly (N-formylethyleneimine) -modified silicone, poly (N-acetylethyleneimine) -modified silicone, and poly (N-propionylethyleneimine) -modified silicone. Silicone and the like can be mentioned. Above all, poly (N) having a weight average molecular weight of about 20,000 to 200,000 represented by the formula (2) and a poly (N-propionylethyleneimine) segment ratio of about 3 to 50% by mass in the molecule. N-propionylethyleneimine) -modified silicone (INCI name: polysilicone-9; elastomer OS (trade name of Kao Corporation)) is preferable.

  The water-absorbing polymer composition of the present invention contains the water-absorbing polymer of the above (A) in an amount of 5% by mass or more, particularly 10% by mass or more, especially 15% by mass or more. This is preferable from the viewpoint of increasing the water absorption performance after the treatment. Further, it is preferable to contain 30% by mass or less, particularly 25% by mass or less, especially 20% by mass or less, from the viewpoints of processing efficiency to the surface treatment target and dischargeability from a nozzle when sprayed. The water-absorbing polymer composition of the present invention preferably contains the water-absorbing polymer of (A) in an amount of from 5% by mass to 30% by mass, particularly from 10% by mass to 25% by mass, particularly preferably from 15% by mass to 20% by mass. .

  When the water-absorbing polymer composition of the present invention contains the 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 point of doing. Further, it is preferable to contain 10% by mass or less, particularly 2% by mass or less, especially 1% by mass or less from the viewpoint of inhibiting water absorption. The water-absorbing polymer composition of the present invention comprises the binder polymer (B) in an amount of from 0.1% by mass to 10% by mass, particularly from 0.2% by mass to 2% by mass, particularly from 0.5% by mass to 1% by mass. It is preferable to include the following.

  In the water-absorbing polymer composition of the present invention, the ratio of the water-absorbing polymer of (A) to the binder polymer of (B) is such that [(A) mass of water-absorbing polymer / (B) of binder polymer). It is preferably 0.5 or more, particularly 3 or more, especially 5 or more from the viewpoint of water absorption. Further, the value of (mass of the water-absorbing polymer of (A) / mass of the binder polymer of (B)) is preferably 300 or less, particularly 60 or less, and particularly preferably 25 or less from the viewpoint of suppressing the reversion of the liquid. . Specifically, the value of [(A) the mass of the water-absorbing polymer / (B) the mass of the binder polymer] is 0.5 to 300, particularly 5 to 60, particularly 5 to 25. Is preferred.

  The water-absorbing polymer composition of the present invention may contain, in addition to the water-absorbing polymer of (A) and the binder polymer of (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-absorbing polymer composition of the present invention. Generally speaking, it is preferred that 400 parts by weight or more, particularly 900 parts by weight or more, especially 1900 parts by weight or more of the volatile solvent is contained in 100 parts by weight of the binder polymer (B). As described above, one type of volatile solvent can be used alone, or two or more types can be used in combination.

  (C) The volatile solvent refers to a substance having a saturated vapor pressure of 3000 Pa or more at the use temperature of the water-absorbing polymer composition. Examples of the volatile solvent include water and an organic solvent, and it is preferable to use a solvent that is not absorbed by the water-absorbing polymer (A). In this respect, the volatile solvent is advantageously 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 can be used in combination. When two or more volatile solvents are used in combination, the above-mentioned saturated vapor pressure is the saturated vapor pressure of the volatile solvent having the lowest saturated vapor pressure among the plural volatile solvents used. Among these volatile solvents, water, alcohol, ether and LPG (a mixture of propane and butane) are preferable from the viewpoint of achieving both the solubility of the polymer and the drying time, and from the group consisting of water, ethanol, dimethyl ether and LPG. It is more preferable to use one or a combination of two or more selected.

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

  The water-absorbing polymer composition of the present invention, for example, can impart a liquid absorption retention property to an application site by applying the composition to a user's clothing. Thereby, the water-absorbing polymer composition of the present invention is used, for example, as a urine absorbent. Alternatively, the composition for surface treatment of the present invention is used as a sweat absorbent. Further, the water-absorbing polymer composition of the present invention is used as a blood absorbent. Further, the water-absorbing polymer composition of the present invention is used as a fiber treatment agent. Regardless of the purpose of use, by using the water-absorbing polymer composition of the present invention, in particular, as a garment, a wearing article directly in contact with the excretion part of the wearer is targeted for application, and a wearer of the wear article in the wearing article is used. By a method having a step of treating a part directly in contact with the excretion part with the water-absorbing polymer composition of the present invention, a water-absorbing article can be easily produced from the wearing article. As described above, the water-absorbing polymer composition of the present invention imparts liquid absorbability to various application objects by treating the application objects. Of course, the water-absorbent polymer composition of the present invention may be contained in a water-absorbent body of a general water-absorbent article. Common water-absorbent articles include, for example, bandages, disposable diapers, sweat-absorbing pads, urine-absorbing pads, sanitary napkins, pantiliners, vaginal sheets, and the like.

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

Regardless of the type of object to which the water-absorbing polymer composition of the present invention is applied, the amount of the composition to be applied is generally 1 g / g from the viewpoints of liquid absorption retention and suppression of liquid reversion. It is preferably at least m ^2, more preferably at least 5 g / m ² , even more preferably at least 10 g / m ² . In addition, from the viewpoint of simplicity of treatment and washing properties, the amount 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-absorbing polymer composition of the present invention applied to an object is preferably 1 g / m ² or more and 30 g / m ² or less, and is preferably 5 g / m ² or more and 20 g / m ² or less. Is more preferably 10 g / m ² or more and 15 g / m ² or less.

  When the water-absorbing polymer composition of the present invention is applied to an application object such as clothing or a water-absorbent article by spraying, the composition is contained in a spray container, and the composition is applied from the spray container to the application object. Can be sprayed. That is, a water-absorbing article having the water-absorbing polymer composition of the present invention and a spray container containing the water-absorbing polymer composition may be used. For the purpose of spraying the water-absorbing polymer composition of the present invention using the water-absorbing imparting article, the spray container may contain a propellant in addition to the water-absorbing polymer composition of the present invention. preferable. As the propellant, those conventionally used for spray containers can be used without any 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 preferred. Further, an alternative chlorofluorocarbon such as HFC-152a can be used. The amount of the propellant contained in the spray container is, based on the mass ratio of the water-absorbing polymer composition of the present invention, which is a stock solution, and the propellant, stock solution: propellant = 40: 60 to 99: 1, particularly 60:40 to 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, the content, and the amount of the propellant so that the pressure in the spray container is 0.15 to 0.55 MPa at 25 ° C.

  As described above, the water-absorbing polymer composition of the present invention can be applied to various types of clothing including underwear, such as underwear, by applying it to a wear article that directly contacts the excretory part of the wearer, thereby absorbing the liquid to the application area. Retention can be imparted. In other words, the application area can be used as an absorbent for a water-absorbing article. Thus, the water-absorbing polymer composition of the present invention can easily make clothing into a water-absorbing article. The water-absorbent article thus obtained effectively prevents the liquid excreted from the wearer from seeping into outerwear (for example, pants, slacks, pants, etc.) and effectively prevents the liquid from returning. Will be prevented.

  When the water-absorbing polymer composition of the present invention is applied to, for example, underwear which is clothing that directly contacts the skin of the user, of the underwear, the outer side, that is, the side farther from the skin of the user, and the inner side, That is, the composition can be applied to one or both of the surfaces close to the skin of the user. In particular, when the surface of the undergarment is treated with the water-absorbing polymer composition of the present invention on the outer side, that is, the side farther from the skin of the user, the amount of liquid returned, and the amount of liquid exudation are more preferably reduced. . Specifically, the liquid excreted on the inner surface side of the underwear passes through the cloth constituting the underwear and reaches the outer surface side of the underwear, and the outer surface side is included in the water-absorbing polymer composition of the present invention. Since the water-absorbing polymer is attached, the liquid is absorbed by the water-absorbing polymer, and the liquid does not easily return. In addition, the liquid that has reached the outer surface side of the undergarment is prevented from further moving by the coating formed by the binder polymer contained in the water-absorbing polymer composition of the present invention, and the liquid hardly oozes out.

With respect to the above-mentioned embodiments, the present invention further discloses the following water-absorbing polymer composition and a water-absorbing article containing the same.
<1>
A water-absorbing polymer composition comprising (A) a water-absorbing polymer, and (B) a polymer other than the water-absorbing polymer, which is soluble in a volatile solvent.

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

<6>
The water-absorbing polymer composition according to any one of <1> to <5>, wherein the polymer (B) has a solubility in water of not more than 70% by mass at 25 ° C.
<7>
The polymer of (B) is the water-absorbing polymer composition according to any one of <1> to <6>, wherein the proportion of the water-insoluble component measured at 25 ° C. is 90% by mass or less.
<8>
The water-absorbing polymer composition according to any one of the above items <1> to <7>, comprising the polymer (B) in an amount of from 0.1% by mass to 10% by mass.
<9>
The water-absorbing polymer composition according to any one of <1> to <8>, wherein the value of [mass of the water-absorbing polymer in (A) / mass of the polymer in (B)] is 0.5 or more and 300 or less. Stuff.
<10>
The water-absorbing polymer composition according to any one of <1> to <9>, further including (C) a volatile solvent.

<11>
(C) The water-absorbing polymer composition according to <10>, wherein the volatile solvent is contained in an amount of 400 parts by mass or more based on 100 parts by mass of the polymer of (B).
<12>
The water-absorbing polymer composition according to <10> or <11>, wherein the volatile solvent (C) has a saturated vapor pressure of 3000 Pa or more at the use temperature of the water-absorbing polymer composition.
<13>
A fiber treatment agent comprising the water-absorbing polymer composition according to any one of <1> to <12>.
<14>
A water-absorbing article comprising the water-absorbing polymer composition according to any one of <1> to <12>, and a spray container containing the water-absorbing polymer composition.
<15>
A method for producing a water-absorbent article, comprising a step of treating the surface of a wearable article that directly contacts a discharge part of a 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, comprising a step of spraying the water-absorbent polymer composition according to any one of the above <1> to <12> onto a wearing article directly in contact with a discharge part of a wearer.
<18>
A water-absorbent article comprising the water-absorbent polymer composition according to any one of <1> to <12>.

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

Synthesis Example 1: Preparation of copolymer composition (binder polymer) derived from ethylenically unsaturated monomer
(Acrylamide / DMAPA acrylate / methoxy methacrylate PEG) copolymer and (acrylamide / alkyl acrylate / DMAPA acrylate / methoxy methacrylate PEG) copolymer were mixed at a mass ratio of 1: 1.
The (acrylamide / DMAPA acrylate / methoxy PEG methacrylate) copolymer was synthesized according to the method described in JP-A-8-291206. Here, the mass ratio of N-tert-butylacrylamide / dimethylacrylamide / dimethylaminopropylacrylamide / methoxypolyethylene glycol (PEG400) methacrylate copolymer was 52/25/2/21.
(Acrylamide / alkyl acrylate / DMAPA acrylate / methoxy methacrylate PEG) copolymer was synthesized according to the method described in JP-A-2-180911. Here, the mass ratio of N-tert-butylacrylamide / ethyl acrylate / N, N-dimethylaminopropylacrylamide / polyethylene glycol methacrylate copolymer was 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 were 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). Here, a 50% ethyl acetate solution of 100.0 parts of a side chain primary aminopropyl-modified polydimethylsiloxane (molecular weight: 110,000; amine equivalent (g / mol): 4,840) is added all at once, and the mixture is heated under reflux for 10 hours. did. The reaction mixture is concentrated under reduced pressure, and a poly (N-propionylethyleneimine) dimethylsiloxane copolymer (segment (A) / segment (B) = 50/50) (hereinafter, referred to as poly (N-acylalkylenimine) -modified silicone) Was obtained as a pale yellow rubbery solid. Its weight average molecular weight in terms of polystyrene was 109,000 (by gel permeation chromatography using chloroform as a developing solvent). Also, as a solvent by methnography). 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 Example]
The components shown in Table 1 below were contained in a spray container in the proportions shown in the same table to produce a water-absorbing component. Using the obtained water-absorbing article, the water-absorbing polymer composition was sprayed on a cloth (65% polyester, 35% cotton, knitted fabric, basis weight 150 g / m ² , size 10 cm × 10 cm) as model clothing. 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 not sprayed with the water-absorbing polymer composition.

Details of the components shown in Table 1 are shown below.
Water-absorbing polymer A: trade name "Aqua Keep 10SH-NF" (manufactured by Sumitomo Seika Co., Ltd., (meth) acryl in constituent monomer; acid ratio; 100.0 mol%, average particle size; 25 µm, water absorption amount: 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)
Each of the binder polymers A and B was dissolved in 100 g of ethanol as a volatile solvent in an amount of 10 g or more and was insoluble in water (solubility in water at 25 ° C .: 0.0% by mass, water-insoluble component: 100.0% by mass) ).

  With respect to the obtained water-absorbent article, the exudation rate of the liquid, the water absorption rate of the liquid, and the liquid return rate were measured by the following methods. Table 1 shows the results.

[Liquid seepage rate, liquid water absorption rate and liquid return rate]
A first filter paper (Advantech, No. 5c, 12 cm) was placed on a horizontal table, and the cloths of Examples and Comparative Examples were placed thereon so that the coated surface of the cloth was down. . In this state, 0.5 mL of a blue colored solution of physiological saline (manufactured by Otsuka Pharmaceutical Co., Ltd.) was dropped toward the upper surface of the cloth. Immediately after the dropping, a second filter paper (Advantech, No. 5c, 12 cm) was placed thereon, and an acrylic plate having a bottom area larger than the area covering the dropped area was further placed thereon, corresponding to the mounting pressure. A pressure of 3 g / cm ² was applied over 30 seconds. The first filter paper assumes outerwear (trousers), the treatment cloth assumes underwear, and the second filter paper assumes user's skin.

  Then, the acrylic plate was removed, and the mass of the first filter paper before and after the dropping of the physiological saline was measured to determine the change in mass. This value is defined as the amount of liquid exuding. Further, the mass of the cloth before and after the drop of the physiological saline was measured, and a change in the mass was obtained. This value is taken as the water absorption of the liquid. Further, the mass of the second filter paper before and after the drop 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 amount of liquid exudation, the amount of liquid absorption, or the amount of liquid return to the total value of the amount of liquid exudation, the amount of liquid absorption, and the amount of liquid return is defined as the percentage of liquid exudation (%) and the amount of liquid absorption. (%) And liquid return rate (%).

  As is clear from the results shown in Table 1, the cloth treated with the water-absorbing polymer composition obtained in each of the examples has a large amount of liquid absorption, a small amount of liquid return, and a small amount of liquid exudation. . Therefore, the cloth provided with the water-absorbing polymer composition obtained in each of the examples is useful as a water-absorbing article.

Claims (9)

  A water-absorbing polymer composition comprising (A) a water-absorbing polymer, and (B) a polymer other than the water-absorbing polymer, which is soluble in a volatile solvent.   The water-absorbing polymer composition according to claim 1, wherein the water-absorbing polymer (A) has an average particle size of 1 µm or more and 100 µm or less.   The water-absorbing polymer composition according to claim 1 or 2, wherein the polymer soluble in the volatile solvent (B) is a copolymer or a silicone copolymer derived from an ethylenically unsaturated monomer.   The water-absorbing polymer composition according to any one of claims 1 to 3, further comprising (C) a volatile solvent.   A fiber treating agent comprising the water-absorbing polymer composition according to any one of claims 1 to 4.   A water-absorbing article comprising the water-absorbing polymer composition according to any one of claims 1 to 4, and a spray container containing the water-absorbing polymer composition.   A method for producing a water-absorbent article, comprising a step of applying the water-absorbent polymer composition according to any one of claims 1 to 4 to a surface of a wear article that directly contacts an excretory part of a wearer.   A method for producing a water-absorbent article, comprising a step of spraying the water-absorbent polymer composition according to any one of claims 1 to 4 onto a wearing article that directly contacts an excretory part of a wearer.   A water-absorbent article comprising the water-absorbent polymer composition according to any one of claims 1 to 4.