WO2018225251A1

WO2018225251A1 - Water-absorbent polymer composition and water-absorbent article containing same

Info

Publication number: WO2018225251A1
Application number: PCT/JP2017/021491
Authority: WO
Inventors: 和啓杉山; 辻　誠; 繁宏松原; 明和　善平
Original assignee: 花王株式会社
Priority date: 2017-06-09
Filing date: 2017-06-09
Publication date: 2018-12-13
Also published as: JP7084391B2; JPWO2018225251A1; TW201902457A

Abstract

This water-absorbent polymer composition includes (A) a water-absorbent polymer and (B) a polymer soluble in a volatile solvent that is a polymer other than the water-absorbent polymer. The average grain size of the water-absorbent polymer of (A) is preferably 1-100 μm. The polymer soluble in a volatile solvent of (B) is also preferably a copolymer derived from an ethylenically unsaturated monomer or a silicone copolymer. This article for imparting water absorbency has the water-absorbent polymer composition and a spray container housing the water-absorbent polymer composition.

Description

Water-absorbing polymer composition and water-absorbing article containing the same

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

A water-absorbing article such as a disposable diaper or a sanitary napkin is usually disposed between a liquid-permeable top sheet that comes into contact with the wearer's skin, a leak-proof back sheet placed on the clothing side, and both sheets. And a liquid-retaining absorber. A water-absorbing polymer is exclusively used as the liquid-absorbing material of the absorbent body, which improves the absorption performance of the water-absorbing article and enables long-time wearing. The water-absorbing article is discarded after being used for a certain period of time by absorbing and holding excretory fluid while being worn by the wearer.

These water-absorbing articles are sufficiently satisfactory for users with a large amount of excretion, but for users with a small amount of excretion, they may feel wearing stress because of their high water absorption capacity. . Moreover, since it has a high water absorption capacity, it tends to be bulky, and there is a case where it is feared that another person may 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 during storage until disposal after use (for example, garbage truck) (Until it arrives), there may be a problem with increasing the amount of garbage in the house. Therefore, it is advantageous that a water-absorbing article having a high water absorption capacity and a low bulk can be provided.

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

Japanese Patent Laid-Open No. 3-109316 JP 2013-199444 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 cannot be said that it is suitable for absorption and retention of bodily fluid excretion 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 wrinkles or the like.

Therefore, an object of the present invention is to provide a technique capable of easily forming a water-absorbing article suitable for absorbing and holding bodily fluid excreta 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 that is soluble in a volatile solvent.

The present invention also provides a water absorbent article and a fiber treatment agent comprising the water absorbent polymer composition.

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

Furthermore, the present invention provides a method for producing a water-absorbent article, comprising a step of treating a water-absorbent polymer composition containing a water-absorbent polymer on the surface of a worn article that directly contacts a wearer's excretory part.

ADVANTAGE OF THE INVENTION According to this invention, the water-absorbent polymer composition which can form a water-absorbent article simply by applying to the clothing including the wear article | item which contact | abuts directly to the excretion part of wearers, such as underwear, is provided. The

Hereinafter, the present invention will be described based on preferred embodiments thereof. The present invention relates to a water-absorbing polymer composition. The water-absorbing polymer composition of the present invention is generally fluid in its state of use. The water-absorbing polymer composition of the present invention is applied to clothing so that the application area of the water-absorbing polymer composition in the garment acquires liquid absorption retention, and the water absorption polymer composition can be easily applied to the application area. It forms a property 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 swells by absorbing and holding water. For example, a polymer that can absorb water having a mass of 3 times or more, particularly 10 times or more of its own weight is preferably used. Examples of water-absorbing polymers include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, cross-linked sodium polyacrylate, (starch-acrylic acid) graft copolymer, (isobutylene-maleic anhydride) copolymer Examples thereof include a polymer and a saponified product 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. Examples of the shape of the water-absorbing polymer particles include a spherical type, a spherical agglomeration type, a block type, a bowl type, and an indeterminate type, and any shape can be used in the present invention without any particular limitation. . The water-absorbing polymer has an average particle size of 1 μm or more from the viewpoint of preventing the water-absorbing polymer from dropping off from the object treated with the surface treatment composition of the present invention and suppressing the dust. Preferably, it is 10 μm or more, and more preferably 20 μm or more. In addition, the average particle diameter 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) to the surface treatment object, More preferably, it is 50 μm or less. The average particle diameter of the water-absorbing polymer particles is preferably 1 μm to 100 μm, more preferably 10 μm to 90 μm, and even more preferably 20 μm to 50 μm.

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

The water-absorbing polymer (A) is preferably 5 g / g or more at 25 ° C. from the viewpoint of securing a sufficient liquid absorption capacity, regardless of the shape of the water-absorbing polymer. More preferably, it is 10 g / g or more, and more preferably 20 g / g or more. Further, from the viewpoint of preventing falling off due to swelling due to 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-absorbing 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 at 25 ° C., and 20 g / g. More preferably, it is 35 g / g or less.

The water absorption 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 at the center in the longitudinal direction, and heat sealed at both ends to a width of 10 cm A nylon bag having an inner dimension of 9 cm and a length of 20 cm is prepared. Next, 1.00 g of the water-absorbing polymer as a measurement sample is precisely weighed and placed uniformly at the bottom of the produced nylon bag. Next, the nylon bag containing the sample is immersed in physiological saline (0.9 mass% sodium chloride aqueous solution) adjusted to 25 ° C. After 1 hour from the start of immersion, the nylon bag is taken out from the physiological saline, suspended in a vertical state for 1 hour and drained, and then dehydrated using a centrifugal dehydrator (model H-130C special model 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 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) before water absorption (when dried) of the nylon bag, and c is before water absorption (when dry) of the sample. 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 three points is taken as the measured value. Further, the measurement is performed at 23 ± 2 ° C. and humidity 50 ± 5%, and the sample is measured after being stored in the same environment for 24 hours or more.

The water-absorbing polymer (A) preferably has a low solubility in a volatile solvent described later from the viewpoint of stably maintaining the water-absorbing polymer composition of the present invention. 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. % Or less is more preferable. This solubility may be zero. In addition, the volatile solvent said here is (C) volatile solvent contained in the water absorbing polymer composition of this invention with the water absorbing polymer of (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 sealed container, powdered (A) was added until it did not dissolve even after stirring for 20 minutes, and the mass a1 (g) of (A) added, The content of the container is filtered with a filter paper (Advantech, No. 5c, 12 cm), and after 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 taken as the solubility (mass%).

The water-absorbing polymer composition of the present invention contains (B) a polymer that dissolves in a volatile solvent in addition to the water-absorbing polymer (A). The polymer (B) is a polymer other than the water-absorbing polymer (A). “Polymer soluble in volatile solvent” means that 100 g of ethanol and 10 g of polymer are mixed and stirred at 25 ° C. for 5 minutes at the use temperature of the water-absorbing polymer composition of the present invention. The remaining undissolved polymer has a solubility of 0.1 g or less.

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

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

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

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

As the binder polymer (B), a polymer that can be dissolved 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 vinyl compounds such as vinyl chloride. As the ethylenically unsaturated monomer, an acrylic compound selected from the group consisting of acrylic acid, acrylic acid salt, acrylic ester, acrylic amide, methacrylic acid, methacrylic acid salt, methacrylic ester and methacrylamide 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.

(B) Another example of the binder polymer is a silicone copolymer. A silicone copolymer is a polymer compound having a main skeleton with a siloxane bond, and N-acylalkyleneimine, acrylic acid, acrylic acid salt, acrylic acid ester, acrylic acid amide, methacrylic acid, methacrylic acid as a copolymerization component. It is a compound containing at least one of acid salts, methacrylic acid esters and methacrylic acid amides in the molecular chain. Silicone copolymers can be broadly classified into two types: physical cross-linked products in which cross-linking points are generated by physical interaction, and chemical cross-linked products linked by covalent bonds. In the present invention, it is preferable to use a physical crosslinked body. This is because the physical cross-linked product is more easily dissolved in a volatile solvent than the chemical cross-linked product.

Examples of the physically crosslinked silicone copolymer include poly (N-acylalkylenimine) -modified silicone, sugar-modified silicone (Japanese Patent Laid-Open No. 63-139106), and polyglycerin-modified silicone (Japanese Patent Laid-Open No. 2004-339244). Examples thereof include polyamino acid-modified silicone (Japanese Patent Laid-Open No. 2002-145724), silicone graft acrylate polymer (Japanese Patent Laid-Open No. 4-342513), and silicone PEG block polymer (Japanese Patent Laid-Open No. 4-234307). Of these, poly (N-acylalkylenimine) -modified silicone is preferably used because of its high solubility in volatile solvents.

Examples of the above-mentioned poly (N-acylalkyleneimine) -modified silicone include a segment of the formula poly (N-acylalkyleneimine) and an organopolysiloxane segment in the molecule, and the end of the organopolysiloxane segment. Alternatively, it is preferable that the poly (N-acylalkyleneimine) segments are bonded to each other through an alkylene group containing a hetero atom in at least one of the silicon atoms in the side chain. The alkylene group containing a hetero atom present in at least one silicon atom at the end or side chain of the segment of the organopolysiloxane has 2 to 20 carbon atoms containing 1 to 3 nitrogen atoms, oxygen atoms or sulfur atoms. Of the 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. Examples include silicone. Among them, a poly (N) compound represented by the formula (2) having a weight average molecular weight of about 20,000 to 200,000 and a poly (N-propionylethyleneimine) segment ratio in the molecule of about 3 to 50% by mass. N-propionylethyleneimine) modified silicone (INCI name: Polysilicone-9; Elastomer OS (trade name of Kao Corporation)) is preferred.

The water-absorbing polymer composition of the present invention contains 5% by mass or more, particularly 10% by mass or more, especially 15% by mass or more of the water-absorbing polymer of the above-mentioned (A). It is preferable from the point which improves the water absorption performance after processing with. Further, it is preferably 30% by mass or less, particularly 25% by mass or less, and particularly preferably 20% by mass or less, from the viewpoint of the processing efficiency to the surface treatment object and the discharge property from the nozzle when sprayed. The water-absorbing polymer composition of the present invention preferably contains the water-absorbing polymer (A) in an amount of 5% by mass to 30% by mass, particularly 10% by mass to 25% by mass, particularly 15% by mass to 20% by mass. .

The water-absorbing polymer composition of the present invention contains the binder polymer (B) described above in an amount of 0.1% by mass or more, particularly 0.2% by mass or more, and particularly 0.5% by mass or more. This is preferable. Moreover, it is preferable from the point of suppression of water absorption inhibition to contain 10 mass% or less, especially 2 mass% or less, especially 1 mass% or less. The water-absorbing polymer composition of the present invention comprises the binder polymer (B) in an amount of 0.1 to 10% by mass, particularly 0.2 to 2% by mass, particularly 0.5 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 (A) to the binder polymer (B) is [mass of water-absorbing polymer (A) / (B) binder polymer The mass] is preferably 0.5 or more, particularly 3 or more, particularly 5 or more from the viewpoint of water absorption. The value of [(A) water-absorbing polymer mass / (B) binder polymer mass] is preferably 300 or less, particularly 60 or less, particularly 25 or less, from the viewpoint of suppressing reversion of the liquid. . Specifically, the value of [(A) water-absorbing polymer mass / (B) binder polymer mass] is 0.5 to 300, particularly 5 to 60, especially 5 to 25. Is preferred.

The water-absorbing polymer composition of the present invention may contain a volatile solvent capable of dissolving the binder polymer in addition to the water-absorbing polymer (A) and the binder polymer (B). The volatile solvent is preferably contained in an amount sufficient to dissolve the total amount of the binder polymer (B) contained in the water-absorbing polymer composition of the present invention. Generally speaking, it is preferable that 400 parts by mass or more, particularly 900 parts by mass or more, and particularly 1900 parts by mass or more of volatile solvent are contained with respect to 100 parts by mass of the binder polymer (B). As described above, the volatile solvent can 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 use temperature of the water-absorbing polymer composition. Examples of the volatile solvent include water and organic solvents, but it is preferable to use a solvent that is not absorbed by the water-absorbing polymer (A). From this point of view, 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. These volatile solvents can be used alone or in combination of two or more. When two or more volatile solvents are used in combination, the saturated vapor pressure is a saturated vapor pressure of a volatile solvent having the lowest saturated vapor pressure among a plurality of 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 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 an ester is used as the volatile solvent, an ester of a monovalent or polyvalent aliphatic alcohol having 1 to 4 carbon atoms and a monovalent or polyvalent fatty acid having 1 to 4 carbon atoms Is preferably used. In particular, it is preferable to use an ester of a monovalent fatty alcohol having 1 to 2 carbon atoms and a monovalent fatty acid having 1 to 3 carbon atoms, such as ethyl acetate or methyl propionate. When nitrile is used as the volatile solvent, it is preferable to use an nitrile of an alkane having 2 to 3 carbon atoms, such as acetonitrile.

The water-absorbing polymer composition of the present invention can impart liquid absorption retention to an application site by applying the composition to a user's clothing, for example. Thereby, the water-absorbing 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. The water-absorbing polymer composition of the present invention is used as a blood absorbent. Furthermore, 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-absorbent polymer composition of the present invention, particularly as clothing, a wearing article that directly contacts the excretory part of the wearer is applied, and the wearer's The water-absorbing article can be easily produced from the worn article by the method having the step of treating the portion directly contacting the excretion part with the water-absorbing polymer composition of the present invention. As described above, the water-absorbing polymer composition of the present invention imparts liquid absorbency to the application object by treating it on various application objects. Of course, the water-absorbing polymer composition of the present invention may be contained in a water-absorbing body of a general water-absorbing article. Common water-absorbing articles include, for example, bandages, disposable diapers, sweat pads, urine pads, sanitary napkins, panty liners, and cage sheets.

The water-absorbing polymer composition of the present invention can be applied to the application object by various methods. For example, the water-absorbing polymer composition of the present invention can be sprayed to treat an object to be applied. Alternatively, the composition can be processed into the application object by immersing the application object in the water-absorbing polymer composition of the present invention. Moreover, the water-absorbing polymer composition of the present invention can be processed into an application object using various coating apparatuses 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-absorbing 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 (B) is formed. This coating stably holds the water-absorbing polymer (A) on the object.

Regardless of the type of the 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 / in terms of absorption retention of liquid and suppression of liquid reversion. It is preferably m ² or more, more preferably 5 g / m ² or more, and further preferably 10 g / m ² or more. Further, from the viewpoints of easy processing and cleanability, 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 object to which the water-absorbing polymer composition of the present invention is applied is preferably 1 g / m ² or more and 30 g / m ² or less, and 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 treated by spraying into an application object such as clothing or a water-absorbing article, the composition is accommodated in a spray container, and the composition is applied from the spray container. Just spray it. That is, a water-absorbing article having the water-absorbing polymer composition of the present invention and a spray container that contains the water-absorbing polymer composition may be used. In order to spray the water-absorbing polymer composition of the present invention using this water-absorbing 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 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. Alternatively, alternative chlorofluorocarbons such as HFC-152a can be used. The amount of the propellant accommodated in the spray container is the mass ratio of the water-absorbent polymer composition of the present invention as the stock solution and the propellant, and the 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. In addition, it is preferable to adjust the type and content 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-absorbent polymer composition of the present invention absorbs liquid in the application area by applying it to a worn article that directly contacts the wearer's excretory part, for example, various clothing such as underwear. Retention can be imparted. In other words, the application area can be an absorbent body of a water absorbent article. Thus, the water-absorbent polymer composition of the present invention can easily make clothing into a water-absorbent article. The water-absorbing article thus obtained effectively prevents the liquid excreted from the wearer from seeping out into the outerwear (for example, trousers, slacks, pants, etc.) and effectively reverses the liquid. To prevent.

When the water-absorbing polymer composition of the present invention is applied to, for example, an undergarment that is in direct contact with the user's skin, the outer surface side of the underwear surface, 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 water-absorbing polymer composition of the present invention on the outer surface side of the underwear surface, that is, the surface side far from the user's skin, because the liquid return amount and the liquid oozing amount are further 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-absorbent polymer composition of the present invention. Since the water-absorbing polymer adheres, the liquid is absorbed by the water-absorbing polymer and the liquid does not easily reverse. Further, the liquid reaching the outer surface side of the undergarment is prevented from further movement by the coating formed by the binder polymer contained in the water-absorbent polymer composition of the present invention, and the liquid does not easily ooze out.

In relation to the above-described embodiments, the present invention further discloses the following water-absorbing polymer composition and water-absorbing article comprising the same.
<1>
A water-absorbing polymer composition comprising: (A) a water-absorbing polymer; and (B) a polymer other than the water-absorbing polymer and soluble in a volatile solvent.

<2>
The water absorbent polymer composition according to <1>, wherein the water absorbent polymer (A) has an average particle diameter of 1 μm or more and 100 μm or less.
<3>
The water absorbent polymer composition according to <1> or <2>, wherein the water absorbent polymer of (A) is contained in an amount of 5% by mass to 30% by mass.
<4>
The water-absorbing polymer according to any one of <1> to <3>, wherein the polymer dissolved in the volatile solvent (B) is a copolymer derived from an ethylenically unsaturated monomer or a silicone copolymer. Composition.
<5>
When the polymer of (B) is mixed with 100 g of ethanol and 10 g of the polymer of (B) at the use temperature of the water-absorbing polymer composition and stirred at 25 ° C. for 5 minutes, The water-absorbing polymer composition according to any one of <1> to <4>, wherein the polymer has a solubility in which the dissolved polymer (B) has a mass of 0.1 g or less.

<6>
(B) The water-absorbing 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 polymer (B) is the water-absorbing polymer composition according to any one of <1> to <6>, wherein the ratio 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 <1> to <7>, wherein the polymer (B) includes 0.1% by mass or more and 10% by mass or less.
<9>
The water-absorbing polymer composition according to any one of <1> to <8>, wherein the value of [mass of water-absorbing polymer (A) / mass of polymer (B)] is 0.5 or more and 300 or less. object.
<10>
The water-absorbing polymer composition according to any one of <1> to <9>, further comprising (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 (B).
<12>
(C) 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 having the water-absorbing polymer composition according to any one of <1> to <12>, and a spray container that contains the water-absorbing polymer composition.
<15>
A method for producing a water-absorbent article, comprising a step of treating the surface of a worn article that directly contacts the wearer's excretion part 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 an amount of the water absorbent polymer composition is 1 g / m ² or more and 30 g / m ² or less.
<17>
The manufacturing method of a water absorbing article which has a process which sprays the water absorbing polymer composition in any one of said <1> thru | or <12> on the wearing article which contact | abuts a wearer's excretion part directly.
<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 examples. 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 / acrylic acid DMAPA / methacrylic acid methoxy PEG) copolymer and (acrylamide / alkyl acrylate / acrylic acid DMAPA / And (methacrylic acid methoxy PEG) copolymer were mixed at a mass ratio of 1: 1.
The (acrylamide / DMAPA / acrylic acid methoxy PEG) copolymer was synthesized according to the method described in JP-A-8-291206. Here, the mass ratio of N-tert-butylacrylamide / dimethylacrylamide / dimethylaminopropylacrylamide / methoxypolyethyleneglycol (PEG400) methacrylate copolymer was 52/25/2/21.
The (acrylamide / alkyl acrylate / acrylic acid DMAPA / methacrylic acid methoxy 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-acylalkylenimine) 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. In a nitrogen atmosphere, the mixture was heated to reflux for 5 hours to obtain terminal reactive poly (N-propionylethyleneimine). 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) was added all at once and heated to reflux for 10 hours. did. The reaction mixture was 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 gummy 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 methanolography). Further, 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 housed in a spray container in the proportions shown in the table to produce a water-absorbing article. Using the obtained water-absorbing article, the water-absorbing polymer composition was sprayed on a cloth as a model garment (65% polyester, 35% cotton, tengu knitting, basis weight 150 g / m ² , size 10 cm × 10 cm). 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 spraying, the product was dried overnight to obtain a water-absorbent article. Moreover, the comparative example evaluated using the untreated cloth which does not spray a water absorbing polymer composition.

Details of the components shown in Table 1 are shown below.
Water-absorbing polymer A: Trade name “Aquakeep 10SH-NF” (manufactured by Sumitomo Seika Co., Ltd., (meth) acrylic in constituent monomers; 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-acylalkylenimine) -modified silicone of Synthesis Example 2)
Binder polymers A and B were both 10 g or more dissolved in 100 g of ethanol, which is a volatile solvent, and insoluble in water (the solubility in water at 25 ° C. was 0.0 mass%, and the water-insoluble component was 100.0 mass%. ).

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

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

Next, the acrylic plate was removed, and the mass of the first filter paper before and after the physiological saline was dropped was measured to determine the change in mass. This value is taken as the amount of liquid oozing. Moreover, the mass of the cloth before and after dropping of the physiological saline was measured, and the change in mass was determined. This value is taken as the water absorption amount of the liquid. Further, the mass of the second filter paper before and after the physiological saline was dropped was measured to determine the change in mass. This value is the liquid return amount. The ratio of the liquid exudation amount, liquid water absorption amount or liquid return amount to the total value of liquid exudation amount, liquid water absorption amount and liquid return amount, liquid exudation rate (%), liquid water absorption rate (%) And liquid return rate (%), respectively.

As is clear from the results shown in Table 1, it can be seen that the fabric treated with the water-absorbing 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 which gave the water-absorbing polymer composition obtained in each example is useful as a water-absorbing article.

Claims

A water-absorbing polymer composition comprising (A) a water-absorbing polymer, and (B) a polymer other than the water-absorbing polymer and 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 dissolved in the volatile solvent (B) is a copolymer derived from an ethylenically unsaturated monomer or a silicone copolymer.
The water-absorbing polymer composition according to any one of claims 1 to 3, further comprising (C) a volatile solvent.
A fiber treatment agent comprising the water-absorbing polymer composition according to any one of claims 1 to 4.
A water-absorbing article having 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 treating the surface of the worn article that directly contacts the wearer's excretion part with the water-absorbent polymer composition according to any one of claims 1 to 4.
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 worn article that directly contacts the excretory part of the wearer.
A water-absorbent article comprising the water-absorbent polymer composition according to any one of claims 1 to 4.