JP6952648B2 - Absorbent article - Google Patents

Description

The present invention relates to absorbent articles. More specifically, children's disposable diapers, adult disposable diapers, napkins, medical blood-retaining agents, pet sheets, panty liners, incontinence pads, sweat-absorbing sheets, medical blood-absorbing articles, wound protectants, wound healing agents and surgical effluents. The present invention relates to an absorbent article used as a treatment agent or the like.

Absorbent articles having an aqueous liquid absorber in which crosslinked polymer particles such as water-absorbent resin particles and hydrophilic fibers such as pulp are mixed, and a tissue or non-woven fabric on the upper surface of the aqueous liquid absorber are widely known. (See, for example, Patent Document 1). Absorbent articles with such a structure have excellent absorbency, but during actual use, the surface of the absorbent articles wet with excrement or the like adheres to the skin for a long time, causing the skin surface to become stuffy. There is a problem that Staphylococcus aureus and P. acnes grow on the skin surface and the absorber rubs against the stuffy skin surface, causing skin rash and the like.

A method of suppressing the growth of bacteria by using an antibacterial agent to suppress the growth of staphylococci and P. acnes in order to suppress skin rash when using an absorbent article, and reducing the contact point between the skin and the non-woven fabric on the surface of the absorber. There was a method of reducing friction and preventing fogging by doing so (see, for example, Patent Documents 1 and 2). However, in these methods, the growth of bacteria such as staphylococcus dermatitis, which promotes metabolism on the skin, is suppressed by the effect of the antibacterial agent, and the non-woven fabric on the surface of the absorber stretches due to the pressure applied to the surface of the absorber, so that the contacts are contacted. The effect of suppressing rough skin was not sufficient because of the increase.

International release 2008/001444 Japanese Unexamined Patent Publication No. 2015-142721

An object of the present invention is to provide an absorbent article that maintains the surface condition of the skin after liquid absorption and suppresses skin irritation.

The present invention comprises a crosslinked polymer (A) containing a water-soluble vinyl monomer (a1) and / or a vinyl monomer (a2) which becomes a water-soluble vinyl monomer (a1) by hydrolysis and a cross-linking agent (b) as essential constituent units. It is an absorbent article comprising an absorber containing the water-absorbent resin particles (P), the liquid diffusion member (B), and the cell activating component (D).
The present invention is also a method for producing the absorbent article, wherein the cell activating component (D) is applied or sprayed on the surface of the liquid diffusion member (B) in advance before forming the absorber. It is a manufacturing method.

In the absorbable article of the present invention, by using the cell activating component (D) as an essential component in the above-mentioned composition, especially in the absorber, the cell activating component promotes the regeneration of the rashed skin and the surface state of the skin. Can be maintained and skin irritation can be suppressed.

The absorbent article of the present invention is a vinyl monomer (a2) that becomes a water-soluble vinyl monomer (a1) and / or a water-soluble vinyl monomer (a1) by hydrolysis (hereinafter, also referred to as a hydrolyzable vinyl monomer (a2)). In addition, the absorber includes an absorbent containing a water-absorbent resin particle (P) having a cross-linked polymer (A) having a cross-linking agent (b) as an essential constituent unit and a liquid diffusion member (B). Further, it contains a cell activating component (D).
In the absorbent article of the present invention, as described above, a component containing the water-absorbent resin particles (P) and the liquid diffusion member (B) is referred to as an absorber.
In the present invention, the absorber is a portion that absorbs an aqueous liquid, and examples of the aqueous liquid include body fluids such as urine, sweat, and blood.

The crosslinked polymer (A) contained in the water-absorbent resin particles (P) contains a water-soluble vinyl monomer (a1) and / or a hydrolyzable vinyl monomer (a2) and a crosslinking agent (b) as essential constituent units.

The water-soluble vinyl monomer (a1) in the present invention is not particularly limited, and is a known monomer, for example, at least one water-soluble substituent disclosed in paragraphs 0007 to 0023 of Japanese Patent No. 36485553 and ethylenia-free. Vinyl monomers having a saturated group (for example, anionic vinyl monomers, nonionic vinyl monomers and cationic vinyl monomers), anionic vinyl monomers and nonionic vinyl monomers disclosed in paragraphs 0009 to 0024 of JP2003-165883A. Select from the group consisting of a sex vinyl monomer, a cationic vinyl monomer, and a carboxy group, a sulfo group, a phosphono group, a hydroxyl group, a carbamoyl group, an amino group, and an ammonio group disclosed in paragraphs 0041 to 0051 of JP-A-2005-75982. A vinyl monomer having at least one of these can be used.

The hydrolyzable vinyl monomer (a2) is not particularly limited, and at least one hydrolyzable substituent which becomes a water-soluble substituent by hydrolysis disclosed in the known {for example, paragraphs 0024 to 0025 of Japanese Patent No. 3648553 is used. The vinyl monomer having at least one hydrolyzable substituent [1,3-oxo-2-oxapropylene (-CO-O-CO-)) disclosed in paragraphs 0052 to 0055 of JP-A-2005-75982. ) Group, acyl group, cyano group, etc.] can be used. The water-soluble vinyl monomer is a concept well known to those skilled in the art, but when expressed using a quantity, it means, for example, a vinyl monomer that dissolves at least 100 g in 100 g of water at 25 ° C. The hydrolyzability of the hydrolyzable vinyl monomer (a2) is a concept well known to those skilled in the art, but more specifically, for example, by the action of water and, if necessary, a catalyst (acid, base, etc.). It means the property of being hydrolyzed and becoming water-soluble. The hydrolyzable vinyl monomer (a2) may be hydrolyzed during polymerization, after polymerization, or both, but it is preferable after polymerization from the viewpoint of the absorption performance of the obtained water-absorbent resin particles.

Of these, the water-soluble vinyl monomer (a1) is preferable from the viewpoint of absorption performance, and the above-mentioned anionic vinyl monomer, carboxy (salt) group, sulfo (salt) group, amino group, and carbamoyl group are more preferable. Vinyl monomers having an ammonium group or a mono-, di- or tri-alkylammonium group, more preferably a vinyl monomer having a carboxy (salt) group or a carbamoyl group, particularly preferably (meth) acrylic acid (salt) and ( Meta) acrylamide, most preferably (meth) acrylic acid (salt), most preferably acrylic acid (salt).

The "carboxy (salt) group" means a "carboxy group" or a "carboxylate group", and the "sulfo (salt) group" means a "sulfo group" or a "sulfonate group". Further, (meth) acrylic acid (salt) means acrylic acid, acrylate, methacrylic acid or methacrylic acid, and (meth) acrylamide means acrylamide or methacrylamide. Examples of the salt include alkali metal (lithium, sodium, potassium, etc.) salt, alkaline earth metal (magnesium, calcium, etc.) salt, ammonium (NH ₄ ) salt, and the like. Among these salts, alkali metal salts and ammonium salts are preferable, and alkali metal salts are more preferable, and sodium salts are particularly preferable, from the viewpoint of absorption performance and the like.

When either the water-soluble vinyl monomer (a1) or the hydrolyzable vinyl monomer (a2) is used as a constituent unit, one of each may be used alone as a constituent unit, or two or more thereof may be used as a constituent unit, if necessary. good. The same applies to the case where the water-soluble vinyl monomer (a1) and the hydrolyzable vinyl monomer (a2) are used as constituent units. When the water-soluble vinyl monomer (a1) and the hydrolyzable vinyl monomer (a2) are used as constituent units, the molar ratio [(a1) / (a2)] of these is preferably 75/25 to 99/1. , More preferably 85/15 to 95/5, particularly preferably 90/10 to 93/7, and most preferably 91/9 to 92/8. Within this range, the absorption performance is further improved.

As a constituent unit of the crosslinked polymer (A), in addition to the water-soluble vinyl monomer (a1) and the hydrolyzable vinyl monomer (a2), another vinyl monomer (a3) copolymerizable with these shall be a constituent unit. Can be done. As the other vinyl monomer (a3), one type may be used alone, or two or more types may be used in combination.

The other copolymerizable vinyl monomer (a3) is not particularly limited, and is known (for example, the hydrophobic vinyl monomer disclosed in paragraphs 0028 to 0029 of Japanese Patent No. 3648553, Japanese Patent Application Laid-Open No. 2003-165883. Hydrophobic vinyl monomers (such as vinyl monomers disclosed in paragraph 0025 and paragraph 0058 of JP-A-2005-75982) can be used. Specifically, for example, the following vinyl monomers (i) to (iii) and the like can be used. Can be used.
(I) Aromatic ethylenic monomer having 8 to 30 carbon atoms Styrene such as styrene, α-methylstyrene, vinyltoluene and hydroxystyrene, halogen-substituted styrene such as vinylnaphthalene and dichlorostyrene and the like.
(Ii) Alkenes (ethylene, propylene, butene, isobutylene, pentene, heptene, diisobutylene, octene, dodecene, octadecene, etc.) and alkaziene (butadiene, isoprene, etc.) and the like, which are aliphatic ethylenic monomers having 2 to 20 carbon atoms.
(Iii) Alicyclic ethylenic monomer having 5 to 15 carbon atoms Monoethylene unsaturated monomer (pinene, limonene, indene, etc.) and polyethylene vinyl monomer [cyclopentadiene, bicyclopentadiene, ethylidene norbornene, etc.] and the like.

The content (mol%) of the other vinyl monomer (a3) unit is based on the total number of moles of the water-soluble vinyl monomer (a1) unit and the hydrolyzable vinyl monomer (a2) unit from the viewpoint of absorption performance and the like. The content is preferably 0 to 5, more preferably 0 to 3, particularly preferably 0 to 2, particularly preferably 0 to 1.5, and the content of the other vinyl monomer (a3) unit is high from the viewpoint of absorption performance and the like. Most preferably, it is 0 mol%.

The cross-linking agent (b) is not particularly limited and reacts with a cross-linking agent having two or more ethylenically unsaturated groups and a water-soluble substituent disclosed in paragraphs 0031 to 0034 of Japanese Patent No. 3648553 (for example). A cross-linking agent having at least one functional group to be obtained and having at least one ethylenically unsaturated group and a cross-linking agent having at least two functional groups capable of reacting with a water-soluble substituent, JP-A-2003-165883. A cross-linking agent having two or more ethylenically unsaturated groups, a cross-linking agent having an ethylenically unsaturated group and a reactive functional group, and a cross-linking agent having two or more reactive substituents disclosed in paragraphs 0028 to 0031. , The cross-linking agent of the cross-linking vinyl monomer disclosed in paragraph 0059 of JP-A-2005-75982 and the cross-linking vinyl monomer disclosed in paragraphs 0015 to 0016 of JP-A-2005-59559) can be used. .. Of these, from the viewpoint of absorption performance and the like, a cross-linking agent having two or more ethylenically unsaturated groups is preferable, and triallyl cyanurate, triallyl isocyanurate and a polypoly of a polyol having 2 to 40 carbon atoms (more preferable). Meta) Allyl ethers, particularly preferred are triallyl cyanurate, triallyl isocyanurate, tetraallyloxyetane, polyethylene glycol diallyl ether and pentaerythritol triallyl ether, most preferably pentaerythritol triallyl ether. The cross-linking agent (b) may be used alone or in combination of two or more.

The content (mol%) of the cross-linking agent (b) unit is (a1) when other vinyl monomers (a3) are also used, which are water-soluble vinyl monomer (a1) units and hydrolyzable vinyl monomer (a2) units. Based on the total number of moles of (a3), 0.001 to 5, more preferably 0.005 to 3, and particularly preferably 0.01 to 1. Within this range, the absorption performance is further improved.

Examples of the polymerization method of the crosslinked polymer (A) include known solution polymerization (adiabatic polymerization, thin film polymerization, spray polymerization, etc.; JP-A-55-133413, etc.) and known reverse phase suspension polymerization (Tokusho). 54-30710, JP-A-56-26909, JP-A-1-5808, etc.).

The crosslinked polymer (A) can be obtained by polymerizing a monomer composition containing a water-soluble vinyl monomer (a1) and / or a hydrolyzable vinyl monomer (a2) and a crosslinking agent (b) as essential constituents. Can be done. Among the polymerization methods, the solution polymerization method is preferable because it is not necessary to use an organic solvent or the like and is advantageous in terms of production cost, and the aqueous solution polymerization method and the aqueous solution polymerization method are more preferable because of the entanglement with the liquid diffusion member (B). It is a reverse phase suspension polymerization method.

When performing aqueous solution polymerization, a mixed solvent containing water and an organic solvent can be used, and the organic solvent includes methanol, ethanol, acetone, methyl ethyl ketone, N, N-dimethylformamide, dimethyl sulfoxide, and two or more of these. Can be mentioned as a mixture of.
When aqueous solution polymerization is carried out, the amount (% by weight) of the organic solvent used is preferably 40 or less, more preferably 30 or less, based on the weight of water.

When an initiator is used for polymerization, conventionally known initiators for radical polymerization can be used. For example, azo compounds [azobisisobutyronitrile, azobiscyanovaleric acid and 2,2'-azobis (2-amidinopropane)) can be used. Hydrochloride, etc.], Inorganic peroxides (hydrogen peroxide, ammonium persulfate, potassium persulfate, sodium persulfate, etc.), organic peroxides [benzoyl peroxide, di-t-butyl peroxide, cumene hydroperoxide, succinate, etc.] Acid peroxides and di (2-ethoxyethyl) peroxydicarbonates, etc.] and redox catalysts (alkali metal sulfites or bisulfites, reducing agents such as ammonium sulfite, ammonium bicarbonate and ascorbic acid, and alkali metal persulfates. (Consists of a combination with an oxidizing agent such as a salt, ammonium persulfate, hydrogen peroxide and an organic peroxide) and the like. These catalysts may be used alone or in combination of two or more of them.
The amount (% by weight) of the radical polymerization initiator used is (a1) to (a3) when other vinyl monomers (a3) of the water-soluble vinyl monomer (a1) and the hydrolyzable vinyl monomer (a2) are also used. Based on the total weight of the above, 0.0005 to 5.0 is preferable, and 0.001 to 2.0 is more preferable.

At the time of polymerization, a polymerization control agent typified by a chain transfer agent may be used in combination, and specific examples thereof include sodium hypophosphite, sodium phosphite, alkyl mercaptans, and alkyl halides. , Thiocarbonyl compounds and the like. These polymerization control agents may be used alone or in combination of two or more of them.
The amount (% by weight) of the polymerization control agent used is the same as that of the water-soluble vinyl monomer (a1) and the hydrolyzable vinyl monomer (a2), and (a1) to (a3) when other vinyl monomers (a3) are also used. Based on the total weight, 0.0005-5 is preferable, and 0.001-2 is more preferable.

When the suspension polymerization method or the reverse phase suspension polymerization method is adopted as the polymerization method, the polymerization may be carried out in the presence of a dispersant or a surfactant, if necessary. Further, in the case of the reverse phase suspension polymerization method, the polymerization can be carried out using a hydrocarbon solvent such as xylene, normal hexane and normal heptane.

The polymerization start temperature can be appropriately adjusted depending on the type of catalyst used, but is preferably 0 to 100 ° C, more preferably 2 to 80 ° C.

When a solvent (organic solvent, water, etc.) is used for the polymerization, it is preferable to distill off the solvent after the polymerization. When the solvent contains an organic solvent, the content (% by weight) of the organic solvent after distillation is preferably 0 to 10, more preferably 0 to 5, and particularly preferably 0 to 5, based on the weight of the crosslinked polymer (A). Is 0 to 3, most preferably 0 to 1. Within this range, the absorption performance of the water-absorbent resin particles is further improved.

When water is contained in the solvent, the water content (% by weight) after distillation is preferably 0 to 20, more preferably 1 to 10, and particularly preferably 2 to 9, based on the weight of the crosslinked polymer (A). Most preferably, it is 3 to 8. Within this range, the absorption performance is further improved.

By the above-mentioned polymerization method, a water-containing gel-like product (that is, a cross-linked polymer (A) which is a water-containing gel-like product; hereinafter abbreviated as water-containing gel) in which the crosslinked polymer (A) contains water can be obtained. Further, the dried crosslinked polymer (A) can be obtained by drying the hydrogel.
When an acid group-containing monomer such as acrylic acid or methacrylic acid is used as the water-soluble vinyl monomer (a1), the hydrogel may be neutralized with a base. The degree of neutralization of the acid group is preferably 50 to 80 mol%. If the degree of neutralization is less than 50 mol%, the adhesiveness of the obtained hydrogel polymer may be high, and workability during production and use may be deteriorated. Further, the amount of water retention of the obtained water-absorbent resin particles may decrease. On the other hand, when the degree of neutralization exceeds 80%, the pH of the obtained resin becomes high, and there may be a concern about the safety of the obtained resin on the human skin.
The neutralization may be carried out at any stage after the polymerization of the crosslinked polymer (A) in the production of the water-absorbent resin particles, and for example, a method of neutralizing in the state of a hydrogel is preferable. Illustrated.
As the base to be neutralized, alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, and alkali metal carbonates such as sodium carbonate, sodium hydrogencarbonate and potassium carbonate can be usually used.

The hydrogel obtained by polymerization can be shredded as needed. The size (longest diameter) of the gel after shredding is preferably 50 μm to 10 cm, more preferably 100 μm to 2 cm, and particularly preferably 1 mm to 1 cm. Within this range, the drying property in the drying step is further improved.

Shredding can be performed by a known method, and can be shredded using a normal shredding device {for example, a Beck's mill, a rubber chopper, a pharma mill, a minced machine, an impact type crusher and a roll type crusher}. ..

As a method for distilling off the solvent (including water), a method of distilling off (drying) with hot air at a temperature of 80 to 230 ° C., a thin film drying method using a drum dryer or the like heated to 100 to 230 ° C., (heating). ) Vacuum drying method, freeze drying method, infrared drying method, decantation, filtration, etc. can be applied.

The hydrogel is dried to obtain a crosslinked polymer (A), which can be dried and then pulverized. The crushing method is not particularly limited, and a normal crushing device {for example, a hammer type crusher, an impact type crusher, a roll type crusher, a shet airflow type crusher} or the like can be used. The particle size of the crushed crosslinked polymer can be adjusted by sieving or the like, if necessary.

The weight average particle size (μm) of the crosslinked polymer (A) when screened as necessary is preferably 100 to 800, more preferably 200 to 700, then preferably 250 to 600, and particularly preferably 300 to 500. Most preferably, it is 350 to 450. Within this range, the absorption performance is further improved, and the entanglement with the liquid diffusion member (B) is also improved.

The weight average particle size is determined by using a low-tap test sieve shaker and a standard sieve (JIS Z8801-1: 2006), Perry's Chemical Engineers Handbook 6th Edition (McGlow Hill Book Canvas, 1984, 21). Page) is measured by the method described. That is, the JIS standard sieves are combined in the order of 1000 μm, 850 μm, 710 μm, 500 μm, 425 μm, 355 μm, 250 μm, 150 μm, 125 μm, 75 μm and 45 μm, and the saucer from the top. Place about 50 g of the measurement particles in the uppermost sieve and shake with a low-tap test sieve shaker for 5 minutes. Weigh the particles to be measured on each sieve and saucer, and take the total as 100% by weight to obtain the weight fraction of the particles on each sieve. ), The vertical axis is the weight fraction}, then a line connecting each point is drawn to obtain the particle diameter corresponding to the weight fraction of 50% by weight, and this is taken as the weight average particle diameter.

Further, when crushed, the smaller the content of the fine particles contained in the crushed crosslinked polymer (A), the better the absorption performance. Therefore, the total weight of the crosslinked polymer (A) is 106 μm or less (preferably 150 μm). The content (% by weight) of the fine particles (below) is preferably 3 or less, more preferably 1 or less. The content of the fine particles can be determined by using the graph created when determining the weight average particle size described above.

When crushed, the shape of the crosslinked polymer (A) after crushing is not particularly limited, and examples thereof include amorphous crushed form, phosphorus flaky form, pearl form, and rice granules. Of these, the amorphous crushed form is preferable from the viewpoint of good entanglement with the liquid diffusion member (B) and no fear of falling off from the fibrous material.

The crosslinked polymer (A) may contain some other components such as a residual solvent and a residual crosslinked component as long as its performance is not impaired.

The crosslinked polymer (A) preferably contains a hydrophobic substance (g) from the viewpoint of surface modification and liquid permeability.

Examples of the hydrophobic substance (g) include a hydrophobic substance containing a hydrocarbon group (g1), a hydrophobic substance containing a hydrocarbon group having a fluorine atom (g2), and a hydrophobic substance having a polysiloxane structure (g3). Etc. are included.

Examples of the hydrophobic substance (g1) containing a hydrocarbon group include polyolefin resins, polyolefin resin derivatives, polystyrene resins, polystyrene resin derivatives, waxes, long-chain fatty acid esters, long-chain fatty acids and salts thereof, long-chain aliphatic alcohols, and long chains. Chain aliphatic amides and mixtures of two or more of these are included.

As the polyolefin resin, the weight of an olefin having 2 to 4 carbon atoms {ethylene, propylene, isobutylene, isoprene, etc.} as an essential constituent monomer (the content of the olefin is at least 50% by weight based on the weight of the polyolefin resin). Polymers having an average molecular weight of 10 to 1,000,000 {for example, polyethylene, polypropylene, polyisobutylene, poly (ethylene-isobutylene), isoprene, etc.} can be mentioned.

As the polyolefin resin derivative, a polymer having a weight average molecular weight of 10 to 1,000,000 in which a carboxy group (-COOH) or 1,3-oxo-2-oxapropylene (-COOCO-) is introduced into a polyolefin resin {for example, polyethylene heat Attenuated product, heat-modified polypropylene, maleic acid-modified polyethylene, chlorinated polyethylene, maleic acid-modified polypropylene, ethylene-acrylic acid copolymer, ethylene-maleic anhydride copolymer, isobutylene-maleic anhydride copolymer, maleic Polybutadiene, ethylene-vinyl acetate copolymer, and maleic compound of ethylene-vinyl acetate copolymer, etc.} can be mentioned.

As the polystyrene resin, a polymer having a weight average molecular weight of 10 to 1,000,000 or the like can be used.

As the polystyrene resin derivative, a polymer having a weight average molecular weight of 10 to 1,000,000 containing styrene as an essential constituent monomer (the content of styrene is at least 50% by weight based on the weight of the polystyrene derivative) {for example, styrene- Maleic anhydride copolymer, styrene-butadiene copolymer, styrene-isobutylene copolymer, etc.} can be mentioned.

Examples of the wax include waxes having a melting point of 50 to 200 ° C. {for example, paraffin wax, beeswax, carbana wax, beef tallow, etc.}.

Examples of long-chain fatty acid esters include esters of fatty acids having 8 to 30 carbon atoms and alcohols having 1 to 12 carbon atoms {for example, methyl laurate, ethyl laurate, methyl stearate, ethyl stearate, methyl oleate, oleic acid. Ethyl, glycerin lauric acid monoester, glycerin stearate monoester, glycerin oleic acid monoester, pentaerythlit lauric acid monoester, pentaerythlit lauric acid monoester, pentaerythlit oleic acid monoester, sorbit lauric acid monoester, Solbit stearate monoester, sorbit oleic acid monoester, sucrose palmitate monoester, sucrose palmitate diester, sucrose palmitate tryester, sucrose stearic acid monoester, sucrose stearate diester, sucrose stearate tri. Esters, beef fat, etc.} can be mentioned.

Examples of long-chain fatty acids and salts thereof include fatty acids having 8 to 30 carbon atoms {for example, lauric acid, palmitic acid, stearic acid, oleic acid, dimer acid, behenic acid, etc.}, and examples thereof include zinc, calcium, and the like. Examples thereof include salts with magnesium or aluminum (hereinafter abbreviated as Zn, Ca, Mg, Al, respectively) {for example, Ca palmitic acid, Al palmitic acid, Ca stearate, Mg stearate, Al stearate, etc.}.

Examples of the long-chain fatty alcohol include aliphatic alcohols having 8 to 30 carbon atoms {for example, lauryl alcohol, palmityl alcohol, stearyl alcohol, oleyl alcohol, etc.}. From the viewpoint of leakage resistance of the absorbent article, palmityl alcohol, stearyl alcohol, and oleyl alcohol are preferable, and stearyl alcohol is more preferable.

Examples of the long-chain aliphatic amide include an amidate of a long-chain aliphatic primary amine having 8 to 30 carbon atoms and a carboxylic acid having a hydrocarbon group having 1 to 30 carbon atoms, ammonia or a primary amine having 1 to 7 carbon atoms. And an amidate of a long-chain fatty acid having 8 to 30 carbon atoms, an amidate of a long-chain aliphatic secondary amine having at least one aliphatic chain having 8 to 30 carbon atoms and a carboxylic acid having 1 to 30 carbon atoms, and Examples thereof include amidates of a secondary amine having two aliphatic hydrocarbon groups having 1 to 7 carbon atoms and a long chain fatty acid having 8 to 30 carbon atoms.

As an amidate of a long-chain aliphatic primary amine having 8 to 30 carbon atoms and a carboxylic acid having a hydrocarbon group having 1 to 30 carbon atoms, a product obtained by a 1: 1 reaction between a primary amine and a carboxylic acid and 1 It is divided into those that reacted in: 2. Examples of the 1: 1 reaction include N-octylamide acetate, N-hexacosylamide acetate, N-octylamide heptacosanoic acid, N-hexacosylamide heptacosanoic acid and the like. Examples of the 1: 2 reaction include N-octylamide diacetate, N-hexacosylamide diacetate, N-octylamide diheptacosanoic acid, and N-hexacosylamide diheptacosanoic acid. When the primary amine and the carboxylic acid are reacted at a ratio of 1: 2, the carboxylic acid used may be the same or different.

As an amidate of ammonia or a primary amine having 1 to 7 carbon atoms and a long-chain fatty acid having 8 to 30 carbon atoms, it is 1: 2 with a product obtained by reacting ammonia or a primary amine with a carboxylic acid in a ratio of 1: 1. It is divided into reacted products. The 1: 1 reaction products include nonanoic acid amide, nonanoic acid methylamide, nonanoic acid N-heptylamide, heptacosanoic acid amide, heptacosanoic acid N-methylamide, heptacosanoic acid N-heptylamide and heptacosanoic acid N-hexacosylamide. And so on. Those that reacted 1: 2 include dinonanoic acid amide, dinonanoic acid N-methylamide, dinonanoic acid N-heptylamide, dioctadecanoic acid amide, dioctadecanic acid N-ethylamide, dioctadecanic acid N-heptylamide, and diheptacosanoic acid amide. , Diheptacosanoic acid N-methylamide, diheptacosanoic acid N-heptylamide, diheptacosanoic acid N-hexacosylamide and the like. The carboxylic acid used may be the same or different as a product obtained by reacting ammonia or a primary amine with a carboxylic acid in a ratio of 1: 2.

Examples of the amidate of a long-chain aliphatic secondary amine having at least one aliphatic chain having 8 to 30 carbon atoms and a carboxylic acid having 1 to 30 carbon atoms include N-methyloctylamide acetate and N-methylhexakoshi acetate. Luamide, N-octylhexacosylamide acetate, N-dihexacosylamide acetate, N-methyloctylamide heptacosanoic acid, N-methylhexacosylamide heptacosanoic acid, N-octylhexacosylamide heptacosanoic acid and heptacosane Acid N-dihexacosylamide and the like can be mentioned.

Examples of the amidate of the secondary amine having two aliphatic hydrocarbon groups having 1 to 7 carbon atoms and the long chain fatty acid having 8 to 30 carbon atoms include nonanoic acid N-dimethylamide and nonanoic acid N-methylheptylamide. Examples thereof include nonanoic acid N-diheptylamide, heptacosanoic acid N-dimethylamide, heptacosanoic acid N-methylheptylamide and heptacosanoic acid N-diheptylamide.

Hydrophobic substances (g2) containing a hydrocarbon group having a fluorine atom include perfluoroalkane, perfluoroalkene, perfluoroaryl, perfluoroalkyl ether, perfluoroalkylcarboxylic acid, perfluoroalkyl alcohol and 2 of these. Includes mixtures of seeds and above.

Examples of the hydrophobic substance (g3) having a polysiloxane structure include polydimethylsiloxane, polyether-modified polysiloxane {polyoxyethylene-modified polysiloxane and poly (oxyethylene / oxypropylene) -modified polysiloxane, etc.}, carboxy-modified polysiloxane, and the like. Epoxy-modified polysiloxane, amino-modified polysiloxane, alkoxy-modified polysiloxane and the like, and mixtures thereof and the like are included.

The HLB value of the hydrophobic substance (g) is preferably 1 to 10, more preferably 2 to 8, and particularly preferably 3 to 7. Within this range, the leakage resistance of the absorbent article becomes even better. The HLB value means a hydrophilic-lipophilic balance (HLB) value, and is obtained by the Oda method (Introduction to New Surfactants, p. 197, Takehiko Fujimoto, published by Sanyo Chemical Industries, Ltd., published in 1981). ..

Among the hydrophobic substances (g), the hydrophobic substance (g1) containing a hydrocarbon group is preferable from the viewpoint of leakage resistance of the absorbent article, and more preferably, a long-chain fatty acid ester, a long-chain fatty acid and a salt thereof. Long-chain fatty alcohols and long-chain aliphatic amides, more preferably sorbit stearic acid ester, sucrose stearic acid ester, stearic acid, Mg stearate, Ca stearate, Zn stearate and Al stearate, particularly preferably. Sucrose stearic acid ester and Mg stearate, most preferably sucrose stearic acid monoester.

The water-absorbent resin particles of the present invention preferably have a structure in which the surface of the crosslinked polymer (A) is crosslinked by the surface crosslinking agent (d). By cross-linking the surface of the crosslinked polymer (A), the gel strength of the water-absorbent resin particles can be improved, and the desired water-retaining amount of the water-absorbent resin particles and the absorption amount under load can be satisfied. Examples of the surface cross-linking agent (d) include polyvalent glycidyl compounds, polyvalent amines, polyvalent aziridine compounds and polyvalent isocyanate compounds described in JP-A-59-189103, and JP-A-58-180233. And the polyhydric alcohol of JP-A-61-16903, the silane coupling agent described in JP-A-61-221305 and JP-A-61-252212, and described in JP-A-5-508425. Uses alkylene carbonates, polyvalent oxazoline compounds described in JP-A-11-240959, and surface cross-linking agents of JP-A-51-136588 and JP-A-61-257235 (polyvalent metals, etc.). can. Among these surface cross-linking agents, polyhydric glycidyl compounds, polyhydric alcohols and polyhydric amines are preferable, and polyhydric glycidyl compounds and polyhydric alcohols are more preferable, and polyhydric alcohols are particularly preferable, from the viewpoint of economy and absorption characteristics. Valuable glycidyl compounds, most preferably ethylene glycol diglycidyl ethers. One type of surface cross-linking agent may be used alone, or two or more types may be used in combination.

In the case of surface cross-linking, the amount (% by weight) of the surface cross-linking agent used is not particularly limited because it can be variously changed depending on the type of the surface cross-linking agent, the conditions for cross-linking, the target performance, etc. From the viewpoint and the like, it is preferably 0.001 to 3, more preferably 0.005 to 2, and particularly preferably 0.01 to 1.5 with respect to 100 parts by weight of the crosslinked polymer (A).

The surface cross-linking of the cross-linked polymer (A) can be carried out by mixing the cross-linked polymer (A) and the surface cross-linking agent (d) and heating if necessary. Examples of the mixing method of the crosslinked polymer (A) and the surface crosslinking agent (d) include a cylindrical mixer, a screw type mixer, a screw type extruder, a turbulizer, a Nauter type mixer, a double-armed kneader, and a flow. Crosslinked polymer using a mixer such as a type mixer, V type mixer, minced mixer, ribbon type mixer, flow type mixer, air flow type mixer, rotary disk type mixer, conical blender and roll mixer ( A method of uniformly mixing the surface cross-linking agent (d) with A) can be mentioned. At this time, the surface cross-linking agent (d) may be diluted with water and / or any solvent before use.

The temperature at which the crosslinked polymer (A) and the surface crosslinked agent (d) are mixed is not particularly limited, but is preferably 10 to 150 ° C, more preferably 20 to 100 ° C, and particularly preferably 25 to 80 ° C. ..

After mixing the crosslinked polymer (A) and the surface crosslinked agent (d), heat treatment is performed. The heating temperature is preferably 100 to 180 ° C., more preferably 110 to 175 ° C., and particularly preferably 120 to 170 ° C. from the viewpoint of fracture resistance of the resin particles. Indirect heating using steam is possible if the heating is 180 ° C. or lower, which is advantageous in terms of equipment, and if the heating temperature is lower than 100 ° C., the absorption performance may deteriorate. The heating time can be appropriately set depending on the heating temperature, but is preferably 5 to 60 minutes, more preferably 10 to 40 minutes from the viewpoint of absorption performance. It is also possible to further surface-crosslink the water-absorbent resin obtained by surface-crosslinking with a surface-crosslinking agent of the same type or different type as the surface-crosslinking agent used first.

After the surface of the crosslinked polymer (A) is crosslinked with the surface crosslinking agent (d), the particle size is adjusted by sieving if necessary. The average grain diameter of the obtained particles is preferably 100 to 600 μm, more preferably 200 to 500 μm. The content of the fine particles is preferably small, the content of the particles of 100 μm or less is preferably 3% by weight or less, and the content of the particles of 150 μm or less is more preferably 3% by weight or less.

The water-absorbent resin particles (P) may contain the cell activating component (D) described later. The cell activating component (D) is diffused together with the aqueous liquid by contacting with the aqueous liquid. It is presumed that the diffused cell-activating component is excellent in maintaining the surface condition of the skin by promoting cell regeneration in the inflamed area of the skin by coming into contact with the skin.

Examples of the cell activating component (D) include amino acids (D1), peptides (D2) and proteins (D3).

Examples of the amino acid (D1) include histidine, glutamic acid, aspartic acid, threonine, arginine, arginine acid, alanine, allantin, proline, hydroxyproline, tyrosine, serine, taurine, glycine, phenylalanine, isoleucine, leucine and valine. Of these, glutamic acid, aspartic acid, threonine, arginine, arginic acid, alanine, allantin, proline and hydroxyproline are preferable from the viewpoint of cell migration.

Examples of the peptide (D2) include artificial peptides such as carnosin, glutamilricin, alanylglutamine, acetylglutaminylheptapeptide and acetyldecapeptide, cell growth factors such as EGF, FGF and IGF, soybean peptides, silk peptides and collagen peptides. Decomposed products are examples of natural products. Of these, carnosine, glutamyllysine, alanylglutamine and EGF are preferable from the viewpoint of cell activation.

Examples of the protein (D3) include elastin, collagen, ceramide, silk fibroin and silk elastin. Of these, elastin, collagen and silk elastin are preferable from the viewpoint of cell migration.

Also included are salts of amino acids, peptides and proteins neutralized with inorganic or organic acids or alkalis.

The content of the cell activating component (D) in the water-absorbent resin particles (P) can be adjusted according to the use of the water-absorbent resin particles, but the crosslinked polymer (A) and the cell activating component (D) Based on the total weight of the above, it is preferably 0.0001 to 10% by weight, more preferably 0.0001 to 1.0% by weight, still more preferably 0.001 to 1.0% by weight. When it is in this range, the liquid permeability of the water-absorbent resin particles becomes good, which is more preferable.

The water-absorbent resin particles can be obtained by mixing the crosslinked polymer (A) and the cell activating component (D). Examples of the method for mixing the cell activating component (D) include a cylindrical mixer, a screw type mixer, a screw type extruder, a turbulizer, a Nauter type mixer, a double-armed kneader, a fluid type mixer, and a V type mixer. , A method of uniformly mixing using a known mixing device such as a minced mixer, a ribbon type mixer, a flow type mixer, an air flow type mixer, a rotary disk type mixer, a conical blender and a roll mixer.

For mixing the crosslinked polymer (A) and the cell activating component (D), it is preferable to add the cell activating component (D) to the crosslinked polymer (A) under stirring. The cell activating component (D) to be added may be added at the same time as water and / or a solvent.
When the cell activating component (D) is added at the same time as water and / or a solvent, a solution in which the cell activating component (D) is dissolved in water and / or a solvent or the cell activating component (D) is dispersed in water and / or a solvent. It is preferable to add a dispersion, and it is more preferable to add a dispersion dispersed in water from the viewpoint of workability and the like. When adding a solution or dispersion, it is preferable to add by spraying or dropping.

The temperature at which the crosslinked polymer (A) and the cell activating component (D) are mixed is not particularly limited, but is preferably 10 to 60 ° C, more preferably 20 to 50 ° C, and particularly preferably 25 to 40 ° C.

After mixing the crosslinked polymer (A) and the cell activating component (D), further heat treatment may be performed. The heating temperature is preferably 25 to 60 ° C. from the viewpoint of heat resistance of the cell activating component. In addition, when heating is not performed, the water and solvent used in combination may remain excessively in the water-absorbent resin, resulting in poor absorption performance.
When heating after mixing the crosslinked polymer (A) and the cell activating component (D), the heating time can be appropriately set depending on the heating temperature, but from the viewpoint of absorption performance, it is preferably 5 to 60 minutes, more preferably. Is 10 to 40 minutes.

The surface of the water-absorbent resin particles (P) can be further coated with an inorganic powder. Examples of this preferred inorganic powder include glass, silica gel, silica sol, silica, clay, carbon fiber, kaolin, talc, mica, bentonite, sericite, asbestos and shirasu). Of the inorganic powders, silica sol, silica and talc are preferred.

The shape of the inorganic powder may be any of amorphous (crushed), spherical, film, rod and fibrous, but amorphous (crushed) or spherical is preferable, and spherical is more preferable. ..

The content (% by weight) of the inorganic powder is preferably 0.01 to 3.0, more preferably 0.05 to 1.0, and then preferably 0., based on the weight of the crosslinked polymer (A). It is 07 to 0.8, particularly preferably 0.10 to 0.6, and most preferably 0.15 to 0.5. Within this range, the anti-fog resistance of the absorbent article becomes even better.

The water-absorbent resin particles (P) include other additives {for example, known (for example, JP-A-2003-225565, JP-A-2006-131767, etc.) preservatives, antifungal agents, antibacterial agents, antioxidants, ultraviolet rays. Absorbents, colorants, fragrances, deodorants, organic fibrous substances, etc.} can also be included. When these additives are contained, the content (% by weight) of the additives is preferably 0.001 to 10, more preferably 0.01 to 5, particularly 0.01 to 10, based on the weight of the crosslinked polymer (A). It is preferably 0.05 to 1, most preferably 0.1 to 0.5.

The water-absorbent resin particles (P) may be crosslinked polymer particles that absorb 40 times their own weight of physiological saline in 40 to 150 seconds, more preferably 55 to 120 seconds, and particularly preferably 65 to 110 seconds. preferable.
Within this range, the anti-fog resistance of the absorbent article becomes even better. The absorption time of physiological saline is the time measured by the following method in a room at 25 ± 2 ° C. and 50 ± 10% humidity. The temperature of the physiological saline used is adjusted in advance to 25 ° C ± 2 ° C before use.

<Measurement of absorption time of physiological saline>
Place 1.00 g of the measurement sample in a 100 ml beaker and add 40 g of physiological saline (salt concentration 0.9% by weight). The mixture is allowed to stand without stirring, and the time until the physiological saline is completely absorbed (the beaker is slightly tilted at the end of water absorption to check the liquid residue) is measured and used as the absorption time (t1). The temperature of the physiological saline used and the measurement atmosphere shall be 25 ° C ± 2 ° C.

The water retention amount (g / g) of the water-absorbent resin particles (P) is preferably 25 to 60, more preferably 26 to 55, and particularly preferably 27 to 50, from the viewpoint of the antifogging resistance of the absorbent article. The amount of water retained in the crosslinked polymer particles is measured by the following method.

<Measurement method of water retention amount of water-absorbent resin particles (P)>
Put 1.00 g of the measurement sample in a tea bag (length 20 cm, width 10 cm) made of a nylon net with an opening of 63 μm (JIS Z8801-1: 2006), and put 1,000 ml of physiological saline (salt concentration 0.9% by weight). Immerse in it for 1 hour without stirring, then hang it for 15 minutes to drain it. Then, the whole tea bag is placed in a centrifuge, dehydrated at 150 G for 90 seconds to remove excess physiological saline, the weight (h1) including the tea bag is measured, and the amount of water retained is calculated from the following formula.
Water retention (g / g) = (h1)-(h2)
The temperature of the physiological saline used and the measurement atmosphere shall be 25 ° C ± 2 ° C.
The weight of the tea bag after centrifugal dehydration is measured in the same manner as above except that the measurement sample is not used (h2).

In the absorbent body of the absorbent article of the present invention, the liquid diffusion member (B) is a member for diffusing the absorbed liquid, and examples thereof include hydrophilic fibers and synthetic fibers. As hydrophilic fibers, various fluff pulps, cotton-like pulps, and other hydrophilic fibers conventionally used in absorbent articles {raw materials (conifers, hardwoods, etc.), manufacturing methods [chemical pulps, semi-chemical pulps, and chemithermomechanicals] Pulp (CTMP), etc.], bleaching method}, sheet-like material such as tissue, etc., are not particularly limited in form. Further, the synthetic fiber can be used alone or in combination with the above-mentioned fluff pulp, cotton-like pulp and the like, and may be in the form of a non-woven fabric sheet. Examples of the synthetic fiber include polyolefin fiber (polyethylene fiber, polypropylene fiber, etc.), polyester fiber (polyester terephthalate fiber, etc.), polyolefin / polyester composite fiber, polyamide fiber, polyacrylonitrile fiber, and the like.

The length and thickness of the hydrophilic fibers are not particularly limited, and usually, the length is preferably in the range of 1 to 200 mm and the thickness is preferably in the range of 0.1 to 100 denier (0.11 to 110 dtex). The shape is not particularly limited as long as it is fibrous, and examples thereof include a web shape, a thin cylindrical shape, a cut split yarn shape, a staple shape, and a filament shape.

In the absorbent body of the absorbent article of the present invention, the water-absorbent resin particles (P) and the liquid diffusion member (B) may be uniformly mixed, or one of them may be unevenly distributed.
By applying the water-absorbent resin particles (P) to various absorbent bodies, it is possible to produce an absorbent article having excellent absorption performance. The absorber is composed of water-absorbent resin particles (P) and hydrophilic fibers or synthetic fibers which are liquid diffusion members (B), and (1) hydrophilicity composed of pulp or the like arranged in layers. A form in which water-absorbent resin particles (P) are dispersed between layers of fibers or synthetic fibers; (2) Hydrophilic fibers made of pulp, heat-sealing fibers, etc., synthetic fibers and water-absorbent resin particles (P) Mixed form; (3) Two or more sheets of water-absorbent paper or non-woven fabric, and if necessary, a form in which water-absorbent resin particles (P) are sandwiched together with hydrophilic fibers can be mentioned.

The amount of the water-absorbent resin particles (P) of the present invention added to the absorber can be variously changed according to the type and size of the absorber and the target absorption performance, but the water-absorbent resin particles (P) and the hydrophilic resin particles (P) are hydrophilic. Based on the total mass of the sex fibers and synthetic fibers, it is preferably 10 to 95% by mass, more preferably 30 to 95% by mass, and particularly preferably 50 to 95% by mass. Within this range, the absorptive capacity of the obtained absorber tends to be further improved.

In order to improve the shape retention before and during use of the absorber, the fibers may be adhered to each other by adding an adhesive binder. Examples of such adhesive binders include heat-sealing synthetic fibers, hot melt adhesives and adhesive emulsions.

Examples of the heat-bondable synthetic fiber include a total fusion type binder such as polyethylene, polypropylene, and an ethylene-propylene copolymer, and a non-total fusion type binder having a side-by-side or core-sheath structure of polypropylene and polyethylene. In the above-mentioned non-total fusion type binder, only the polyethylene portion is heat-sealed.

Examples of the hot melt adhesive include base polymers such as ethylene-vinyl acetate copolymer, styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer and amorphous polypropylene, and tackifiers, plasticizers and antioxidants. Formulation of.

Adhesive emulsions include, for example, polymers of at least one monomer selected from the group consisting of methyl methacrylate, styrene, acrylonitrile, 2-ethylhexyl acrylate, butyl acrylate, butadiene, ethylene and vinyl acetate. .. These adhesive binders may be used alone or in combination of two or more.

In the present invention, the cell activating component (D) is diffused together with the aqueous liquid by contacting with the aqueous liquid. It is assumed that the diffused cell-activating component comes into contact with the skin to suppress inflammation and promote skin regeneration, so that the surface condition of the skin is maintained and skin irritation is unlikely to occur.

The absorber in the absorbent article of the present invention preferably contains the cell activating component (D) at a site through which the liquid passes. The cell activating component (D) may be in contact with the skin during water absorption and may not be in contact with the skin before water absorption. From the viewpoint of preventing the cell activation component (D) from falling off, the cell activation component (D) is preferably contained in the absorber before water absorption, and is preferably a tissue, a non-woven fabric, a water-absorbent resin particle, a hydrophilic fiber, or a synthetic fiber. It is more preferable to apply it to the fiber.

As the cell activating component (D), a liquid diffusing member (B) containing the cell activating component (D) can be obtained by mixing the liquid diffusing member (B) and the cell activating component (D). It is preferably obtained by bringing the water dispersion containing the cell activating component (D) into contact with the liquid diffusing member (B) and then removing the water. By mixing the cell activating component (D) in this way, the cell activating component (D) is incorporated into the surface or the inside of the liquid diffusing member (B). It is preferable that at least the surface of the liquid diffusible member (B) is adhered, and more preferably, most of the liquid diffusible member (B) is attached to the surface.

The method of bringing the liquid diffusible member (B) into contact with the aqueous solution containing the cell activating component (D) or the aqueous dispersion is not particularly limited. A method of immersing the liquid diffusing member (B) in an aqueous solution containing the cell activating component (D) or an aqueous dispersion, or dropping, applying, or spraying the aqueous dispersion containing the cell activating component (D) onto the surface of the liquid diffusing member (B). And the like. Thus, it is preferable to apply or spray the cell activating component (D) on the surface of the liquid diffusion member (B) in advance before forming the absorber. A known method can be used as the method for constructing the absorber. For example, the absorber can be produced by a known manufacturing method (Japanese Patent Laid-Open Nos. 2013-255565, 2014-233447, 2003-225565). No., JP-A-2006-131767, JP-A-2005-097569, etc.).

The concentration of the cell activating component (D) in the aqueous solution containing the cell activating component (D) or the aqueous dispersion is preferably 0.01 to 10.0% by mass, more preferably 0.05 to 3.0% by mass, still more preferably. Is 0.1 to 1.0. In the case of immersion, the lower the dispersion liquid concentration, the easier it is to add, and in the case of coating or spraying, the higher the dispersion liquid concentration is preferable from the viewpoint of shortening the drying time.

In the present invention, the content of the cell activating component (D) is preferably 0.001 to 10% by mass, more preferably 0.001 to 10% by mass, based on the total weight of the liquid diffusion member (B) from the viewpoint of anti-inflammatory property and absorption performance. It is 0.01 to 5.0% by mass, particularly preferably 0.01 to 1.0% by mass.

Water when contacted as an aqueous solution or an aqueous dispersion may be removed, or it may be used as it is without being removed. The method for removing water is not particularly limited. For example, there is a method in which an appropriate amount of the cell activating component (D) of the present invention is brought into contact with the liquid diffusing member (B), followed by squeezing, centrifugal dehydration, heating, and drying to remove water. The heating temperature is preferably 15 to 60 ° C, more preferably 20 to 50 ° C. From the viewpoint of suppressing coloration, the heating and drying time is preferably 15 minutes or more, and more preferably 1 hour or more by blowing air at a temperature close to room temperature. If the drying time is 1 hour or more, it will be in a dry state to the extent that there is no problem in actual use.

In the absorbent article of the present invention, since the absorber contains the cell activating component (D) during absorption of the aqueous liquid, it is characterized in that it suppresses the increase of the causative bacteria of skin inflammation and suppresses skin inflammation.

The absorber in the absorbent article of the present invention exhibits a silky feel even when it absorbs a liquid to be absorbed (body fluid such as sweat, urine and blood, and water such as seawater, groundwater and muddy water). When this absorber is applied to sanitary products such as disposable diapers and sanitary napkins, rough skin due to stuffiness can be suppressed and improved.

As the absorbent article, an absorbent article provided with an absorber, a liquid permeable sheet and a breathable back sheet is preferable, and an absorbent article as a hygienic article is more preferable. Hygiene products include paper diapers (children's disposable diapers and adult disposable diapers, etc.), napkins (sanitary napkins, etc.), paper towels, pads (pads for incontinence and surgical underpads, etc.) and pet sheets (pet urine absorption sheets). And so on. Of these hygienic items, disposable diapers are more suitable. As the constitution and manufacturing method of these absorbent articles, known ones can be applied.

For example, by sandwiching the above-mentioned absorber between a liquid-permeable sheet and a liquid-impermeable sheet, an absorbent article such as a sanitary napkin or a disposable paper diaper can be formed.

Examples of the material of the liquid-permeable sheet include a non-woven fabric made of polyolefin such as polyethylene and polypropylene, polyester and polyamide, polyurethane and the like, a porous synthetic resin film and the like.

Examples of the material of the impermeable sheet include a synthetic resin film made of polyethylene, polypropylene, ethylene vinyl acetate, polyvinyl chloride, etc., a film made of a composite material of these synthetic resins and a non-woven fabric, and the above-mentioned synthetic resin. Examples thereof include a film made of a composite material with a woven fabric. This impermeable sheet may have the property of allowing vapor to pass through.

Hereinafter, the present invention will be further described with reference to Examples, but the present invention is not limited thereto. Hereinafter, unless otherwise specified,% indicates a weight% and a part indicates a weight part.

<Production example of crosslinked polymer particles>
<Manufacturing example 1>
Water-soluble vinyl monomer (a1) {acrylic acid} 155 parts (2.15 mol parts), cross-linking agent (b) {pentaerythritol triallyl ether} 0.6225 parts (0.0024 mol parts) and deionized water 340. 27 parts were kept at 3 ° C. while stirring and mixing. After influxing nitrogen into this mixture to reduce the amount of dissolved oxygen to 1 ppm or less, 0.62 parts of a 1% hydrogen hydrogen solution solution and 1.1625 parts of a 2% ascorbic acid aqueous solution and 2% of 2,2'-azobis [ 2.325 parts of an aqueous solution of 2-methyl-N- (2-hydroxyethyl) -propionamide] was added and mixed to initiate polymerization. After the temperature of the mixture reached 90 ° C., a hydrogel (1) was obtained by polymerizing at 90 ± 2 ° C. for about 5 hours.
Next, while chopping 502.27 parts of this hydrogel (1) with a mincing machine, 128.42 parts of a 48.5% sodium hydroxide aqueous solution was added and mixed, and then the hydrophobic substance (g) {Mg stearate was added. } 1.9 parts were added and mixed to obtain a shredded gel (2). Further, the shredded gel (2) was dried with a ventilation type band dryer {150 ° C., wind speed 2 m / sec} to obtain a dried product. The dried product was pulverized with a juicer mixer and then adjusted to a particle size of 150 to 710 μm using a sieve having a mesh size of 150, 300, 500, 600 and 710 μm to obtain dried product particles. While stirring 100 parts of the dried body particles at high speed, 5 parts of a 2% water / methanol mixed solution of ethylene glycol diglycidyl ether (water / methanol weight ratio = 70/30) is added while spraying and mixed, and 150 parts are mixed. The mixture was allowed to stand at ° C. for 30 minutes for surface cross-linking to obtain water-absorbent resin particles (P-1). The weight average particle size of the water-absorbent resin particles (P-1) was 400 μm, and the apparent density was 0.58 g / ml. The weight average particle size and the apparent density were measured by the following methods.

<Measurement of weight average particle size>
Standard sieves with openings of 1000 μm, 850 μm, 710 μm, 500 μm, 425 μm, 355 μm, 250 μm, 150 μm, 125 μm, 75 μm and 45 μm were stacked in order and combined on a saucer. About 50 g of water-absorbent resin particles were placed on the uppermost sieve and shaken with a low-tap test sieve shaker for 5 minutes. Weigh the particles remaining on each sieve and saucer, and take the total as 100% by weight to obtain the weight fraction of the particles on each sieve. Particle size), the vertical axis is the weight fraction}, then a line connecting each point was drawn to obtain the particle size corresponding to the weight fraction of 50% by weight, and this was taken as the weight average particle diameter.

<Measurement of apparent density>
The measurement was performed in accordance with JIS K7365: 1999 in an environment of 25 ° C.

<Manufacturing example 2>
"Adjust to a particle size of 150 to 710 μm using a sieve with a mesh size of 150, 300, 500, 600, 710 μm" is adjusted to a particle size of 150 to 500 μm using a sieve with a mesh size of 150, 300, 500 μm. , A water-absorbent resin particles (P-2) were obtained in the same manner as in Production Example 1. The weight average particle diameter of the water-absorbent resin particles (P-2) measured in the same manner as in Production Example 1 was 300 μm, and the apparent density was 0.66 g / ml.

<Manufacturing example 3>
Water-absorbent resin particles (P-3) were obtained in the same manner as in Production Example 1 except that the hydrophobic substance (g) was not used. The weight average particle diameter of the water-absorbent resin particles (P-3) measured in the same manner as in Production Example 1 was 400 μm, and the apparent density was 0.64 g / ml.

<Manufacturing example 4>
145.4 parts of acrylic acid was diluted with 9.4 parts of water and neutralized by adding 242.3 parts of a 25% aqueous sodium hydroxide solution while cooling to 30 to 20 ° C. 0.09 parts of ethylene glycol diglycidyl ether, 0.0146 parts of sodium hypophosphate monohydrate and 0.0727 parts of potassium persulfate were added to and dissolved in this solution, and a biomixer (Nippon Seiki Co., Ltd.) was added at 25 ° C. An aqueous monomer solution was obtained by stirring and dispersing for 2 minutes with ABM-2 type manufactured by the company.

Next, 624 parts of cyclohexane was placed in a reaction vessel equipped with a stirrer, a reflux condenser, a thermometer and a nitrogen gas introduction tube, and a polyoxyethylene octylphenyl ether phosphate ester (Daiichi Kogyo Seiyaku Co., Ltd., Commodity) was placed therein. Name: Reflux A210G) After adding and dissolving 1.56 parts, nitrogen was substituted with stirring, and the temperature was raised to 70 ° C. Then, while keeping the temperature at 70 ° C., the monomer aqueous solution was added dropwise at 6.6 parts / minute for 6 minutes and held at 75 ° C. for 15 minutes, and then the remaining monomer aqueous solution was added at 6.6 parts / minute for 54 minutes. Dropped. Then, after aging at 75 ° C. for 30 minutes, the water content of the resin is about 20% by azeotropic water with cyclohexane (infrared moisture meter: FD-100 type, manufactured by Kett, measured at 180 ° C. for 20 minutes). It was removed until it became. When the mixture was cooled to 30 ° C. and stirring was stopped, the water-containing absorbent resin particles settled. Therefore, the absorbent resin particles and the cyclohexane layer were separated by decantation, separated by filtration, dried under reduced pressure at 80 ° C., and dried. Obtained particles. While stirring 100 parts of the dried body particles at high speed (high-speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm), 0.06 part of ethylene glycol diglycidyl ether as a surface cross-linking agent (d) and 0.42 parts of methanol were added. A mixed solution containing 0.18 parts of ion-exchanged water was added, and the mixture was uniformly mixed and then heated at 135 ° C. for 30 minutes to obtain surface-crosslinked water-absorbent resin particles (P-4). The weight average particle diameter of the water-absorbent resin particles (P-4) measured in the same manner as in Production Example 1 was 320 μm, and the apparent density was 0.50 g / ml.

<Manufacturing example 5>
While stirring 100 parts of the water-absorbent resin particles (P-1) obtained in Production Example 1 at high speed (high-speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm), arginic acid (manufactured by Tokyo Kasei Co., Ltd.) 0.1. Parts were added and uniformly mixed. The mixture was heated at 60 ° C. for 90 minutes to obtain water-absorbent resin particles (P-5).

<Manufacturing example 6>
The same operation as in Production Example 5 was performed except that "0.1 part of arginine" was changed to "1.5 parts of hydroxyproline (manufactured by Tokyo Kasei Co., Ltd.)" to obtain water-absorbent resin particles (P-6). rice field.

<Manufacturing example 7>
In Production Example 5, the water-absorbent resin particles (P-1) are changed to the water-absorbent resin particles (P-2), and "0.1 part of arginic acid" is changed to "Carnosin (manufactured by Junsei Chemical Co., Ltd.) 0.2. The same operation as in Production Example 6 was carried out except that the part was changed to "Part" to obtain water-absorbent resin particles (P-7).

<Manufacturing example 8>
In Production Example 5, the same operation as in Production Example 5 was performed except that "0.1 part of arginine acid" was changed to 0.003 part of "EGF (manufactured by Tokyo Kasei Co., Ltd.)", and the water-absorbent resin particles (P-8). ) Was obtained.

<Manufacturing example 9>
In Production Example 5, the water-absorbent resin particles (P-1) were changed to the water-absorbent resin particles (P-4), and "0.1 part of arginine acid" was changed to "glutamylricin (genuine chemical company) 0.002. The same operation as in Production Example 5 was carried out except that the part was changed to "Part" to obtain water-absorbent resin particles (P-9).

<Manufacturing example 10>
In Production Example 5, the same operation as in Production Example 5 was performed except that "0.1 part of arginine acid" was changed to "0.2 part of collagen (manufactured by Sasaki Chemical Co., Ltd.)", and the water-absorbent resin particles (P) -10) was obtained.

<Manufacturing example 11>
In Production Example 5, the same operation as in Production Example 5 was carried out except that "0.1 part of arginine acid" was changed to "0.003 part of silk elastin" to obtain water-absorbent resin particles (P-11).

<Manufacturing example 12>
In Production Example 5, the same operation as in Production Example 5 was carried out except that "0.1 part of arginine acid" was changed to "0.01 part of histidine hydrochloride" to obtain water-absorbent resin particles (P-12). ..

<Manufacturing example 13>
In Production Example 5, the same operation as in Production Example 5 was performed except that "0.1 part of arginine acid" was changed to "0.08 part of histidine hydrochloride" and "0.02 part of histidine hydrochloride". Particles (P-13) were obtained.

<Manufacturing Comparative Example 1>
The water-absorbent resin particles (P-1) obtained in Production Example 1 were used as they were as the water-absorbent resin particles (R-1) for comparison.

As a result of performance evaluation of the water-absorbent resin particles (P-1) to (P-13) of Production Examples 1 to 13 and the water-absorbent resin (R-1) of Comparative Production Example 1, a physiological saline solution having a weight of 40 times its own weight. [Physiological saline (40 times) absorption time] and water retention amount were measured by the following methods, and are shown in Table 1 together with the weight average particle size and the apparent density.

<Measurement of saline (40 times) absorption time>
40 g of physiological saline (salt concentration 0.9% by weight) was added to each of the 100 ml beakers containing 1.00 g of the water-absorbent resin particles (P). After that, let it stand without stirring, measure the time until the saline solution is completely absorbed (tilt the beaker a little at the end of water absorption to check the liquid residue), and absorb the saline solution (40 times). It was time. The physiological saline used and the temperature of the measurement atmosphere were 25 ° C ± 2 ° C.

<Measurement of water retention>
Put 1.00 g of water-absorbent resin particles (P) in a tea bag (length 20 cm, width 10 cm) made of a nylon net with an opening of 63 μm (JIS Z8801-1: 2006), and physiological saline (salt concentration 0.9 weight). %) Immersed in 1,000 ml for 1 hour without stirring. Then, the tea bag was lifted from the saline solution, hung for 15 minutes to drain water, placed in a centrifuge together with the tea bag, and centrifuged at 150 G for 90 seconds to remove excess physiological saline solution. The weight (h1) including the tea bag after dehydration was measured. Further, the weight of the tea bag operated in the same manner except that the crosslinked polymer particles were not added was measured (h2), and the water retention amount was determined from the following formula.
Water retention (g / g) = (h1)-(h2)
The temperature of the physiological saline used and the measurement atmosphere was 25 ° C. ± 2 ° C.

<Manufacturing example 14>
An aqueous dispersion containing arginic acid was produced. That is, 3.0 parts of arginine acid and 300 parts of ion-exchanged water were added to a 500 mL separable flask and stirred well. An aqueous dispersion (S) containing arginic acid (solid content concentration 1.0%) was obtained.

<Manufacturing example 15>
8 g / of 1.0 wt% arginine acid aqueous dispersion (S) in a non-woven fabric (b-1) {nonwoven fabric ^{grain: 25 g / m 2, manufactured by Toyobo Co., Ltd. 2.2T 44-SMK} which is a diffusible member (B).} A non-woven fabric (b-5) was obtained by spraying uniformly so as to be ^{m 2.}

<Manufacturing example 16>
An aqueous dispersion (S) containing 1.0% by weight arginic acid in a water-permeable sheet (b-2) {meshing 15.5 g / m ^{2, manufactured by Advantech, filter paper No. 2}, which is a diffusible member (B).} Was sprayed uniformly so as to be 8 g / m ^2, and a water-permeable sheet (b-6) was obtained.

<Manufacturing example 17>
To 100 parts of hydrophilic fiber (b-3) {fluff pulp} which is a diffusible member (B), 10 parts of an aqueous dispersion (S) containing 1.0 wt% arginine acid is uniformly added by spraying to make it hydrophilic. Fiber (b-7) was obtained.

<Manufacturing example 18>
1000 parts of an aqueous dispersion containing 1.0% by weight of arginic acid, which is a diffusible member (B), "nonwoven fabric (b-4) {nonwoven fabric ^{grain: 22 g / m 2} , manufactured by HAVIX Corporation, thermal bond non-woven fabric S2260}". After immersing in the cloth for 1 hour, the diffusible member (B) was taken out and dried in a circulating air dryer at 40 ° C. for 1 hour to obtain a non-woven fabric (b-8).

<Example 1>
Non-woven fabric (b-1) which is a diffusible member (B) uniformly so that the water-absorbent resin particles (P-5) have a grain size of 200 g / m ^{2 , {non-woven fabric grain: 25 g / m 2} , manufactured by Toyobo Co., Ltd. 2.2 T 44-SMK} was sprinkled by hand, and water ^{was sprayed evenly from above to a concentration of 17.5 g / m 2} to obtain an absorber (1). This absorber (1) is cut into a rectangle of 10 cm × 40 cm, and the absorber (1) is a water-permeable sheet (b-2) {Metsuke, which is a diffusible member (B) having the same size as the absorber (1). An absorber (1-1) was obtained by sandwiching it with filter paper No. 2} manufactured by Advantech Co., Ltd. at 15.5 g / m ^2. Furthermore, as a back sheet, a polyethylene sheet (polyethylene film UB-1 manufactured by Tamapoli) is placed on the back surface, and a non-woven fabric (b-1) (nonwoven fabric ^{grain: 25 g / m 2} , 2.2T 44-SMK manufactured by Toyobo Co., Ltd.) is placed on the outermost surface. The absorbent article (1) was prepared by the above.

<Example 2>
Other than changing "water-absorbent resin particles (P-5)" to "water-absorbent resin particles (P-1)" and changing "nonwoven fabric (b-1)" to "nonwoven fabric (b-5)" , An absorbent article (2) was prepared in the same manner as in Example 1.

<Example 3>
"Water-absorbent resin particles (P-5)" was changed to "water-absorbent resin particles (P-1)", and "water-permeable sheet (b-2)" was changed to "water-permeable sheet (b-6)". An absorbent article (3) was prepared in the same manner as in Example 1 except for the modification.

<Example 4>
Except for changing the "water 17.5 g / ^{m 2"} to "aqueous dispersion containing 0.1% by weight alginate (S) 8 g / ^{m 2",} in the same manner as in Example 1 an absorbent article (4) Was prepared.

<Example 5>
"Water-absorbent resin particles (P-5)" was changed to "water-absorbent resin particles (P-1)", and "water 17.5 g / m ² " was changed to "water containing 0.01 wt% histidine hydrochloride". An absorbent article (5) was prepared in the same manner as in Example 1 except that the dispersion liquid (S) ^{was changed to 8 g / m 2 ”.}

<Example 6>
"Water-absorbent resin particles (P-5)" was changed to "water-absorbent resin particles (P-1)", and "water 17.5 g / m ² " was changed to "0.08 wt% histidine hydrochloride and 0. An absorbent article (6) was prepared in the same manner as in Example 1 except that the aqueous dispersion (S) containing 02 wt% histidine ^{was changed to 8 g / m 2 ”.}

<Example 7>
20 parts of hydrophilic fiber (b-3) {fluff pulp} and 80 parts of water-absorbent resin particles (P-5) are mixed by an air flow type mixer {padformer} to obtain a mixture, and then this mixture is obtained. Is uniformly laminated on an acrylic plate (thickness 4 mm) so as to have a grain size of 250 g / m ^2, and water is uniformly sprayed from above so as to be ^{17.5 g / m 2,} and 30 at a pressure of ^{5 kg / cm 2.} Pressing for seconds gave the absorber (2). The absorber (2) was cut into a rectangle of 10 cm × 40 cm, water-permeable sheet (b-2) having the same size as the absorbent member above and below the respective {basis weight 15.5 g / ^{m 2,} manufactured by ADVANTEC, filter paper No. 2} was placed to obtain an absorber (2-1). Furthermore, as a back sheet, a polyethylene sheet (polyethylene film UB-1 manufactured by Tamapoli) is placed on the back surface, and a non-woven fabric (b-1) {nonwoven fabric ^{grain: 25 g / m 2} , 2.2T 44-SMK manufactured by Toyobo Co., Ltd.} is placed on the front surface. The absorbent article (7) was prepared by the above. The weight ratio of the water-absorbent particles to the hydrophilic fibers (weight of the water-absorbent resin particles / weight of the hydrophilic fibers) was 80/20.

<Example 8>
The "hydrophilic fiber (b-3)" was changed from 20 parts to 50 parts, and the "water-absorbent resin particles (P-5)" was changed from 80 parts to 50 parts. The absorbent article (8) was prepared.

<Example 9>
"Water-absorbent resin particles (P-5)" was changed to "water-absorbent resin particles (P-1)", and "water 17.5 g / m ² " was changed to "water dispersion containing 0.1 wt% arginine acid". An absorbent article (9) was prepared in the same manner as in Example 7 except that the solution (S) ^{was changed to 8 g / m 2 ”.}

<Example 10>
"Water-absorbent resin particles (P-5)" was changed to "water-absorbent resin particles (P-1)", and "water 17.5 g / m ² " was changed to "water containing 0.01 wt% histidine hydrochloride". An absorbent article (10) was prepared in the same manner as in Example 7 except that the dispersion liquid (S) ^{was changed to 8 g / m 2 ”.}

<Example 11>
"Water-absorbent resin particles (P-5)" was changed to "water-absorbent resin particles (P-1)", and "water 17.5 g / m ² " was changed to "0.08 wt% histidine hydrochloride and 0. An absorbent article (11) was prepared in the same manner as in Example 7 except that the aqueous dispersion (S) containing 02 wt% histidine ^{was changed to 8 g / m 2 ”.}

<Example 12>
An absorbent article (12) was prepared in the same manner as in Example 1 except that the "water-absorbent resin particles (P-5)" were changed to "water-absorbent resin particles (P-8)".

<Example 13>
"Water-absorbent resin particles (P-5)" was changed to "water-absorbent resin particles (P-1)", and "water-permeable sheet (b-2)" was changed to "water-permeable sheet (b-6)". An absorbent article (13) was prepared in the same manner as in Example 7 except for the modification.

<Example 14>
"Water-absorbent resin particles (P-5)" was changed to "water-absorbent resin particles (P-1)", and "Non-woven fabric (b-1) placed on the outermost surface (nonwoven fabric grain: 25 g / m ² , Toyobo) An absorbent article (14) was prepared in the same manner as in Example 7 except that "2.2T 44-SMK) manufactured by the company was changed to" non-woven fabric (b-5) ".

<Example 15>
An absorbent article (15) was prepared in the same manner as in Example 7 except that the “water-absorbent resin particles (P-5)” were changed to “water-absorbent resin particles (P-9)”.

<Example 16>
An absorbent article (16) was prepared in the same manner as in Example 7 except that the “water-absorbent resin particles (P-5)” were changed to “water-absorbent resin particles (P-10)”.

<Example 17>
An absorbent article (17) was prepared in the same manner as in Example 7 except that the “water-absorbent resin particles (P-5)” were changed to “water-absorbent resin particles (P-11)”.

<Example 18>
"Water-absorbent resin particles (P-5)" was changed to "water-absorbent resin particles (P-3)", and "water-permeable sheet (b-2)" was changed to "water-permeable sheet (b-6)". An absorbent article (18) was prepared in the same manner as in Example 7, except that it was changed.

<Example 19>
An absorbent article (19) was prepared in the same manner as in Example 18 except that the “water permeable sheet (b-6)” was changed to “nonwoven fabric (b-8)”.

<Example 20>
"Water-absorbent resin particles (P-5)" have been changed to "water-absorbent resin particles (P-3)", and "nonwoven fabric (b-1) placed on the outermost surface" has been changed to "nonwoven fabric (b-8)". An absorbent article (20) was prepared in the same manner as in Example 7 except that the above was changed to.

<Comparative example 1>
A comparatively absorbent article (1) was prepared in the same manner as in Example 1 except that the “water-absorbent resin particles (P-5)” were changed to “water-absorbent resin particles (R-1)”.

The absorbent articles (1 to 20) obtained in Examples 1 to 20 and the comparative absorbent articles (H1) obtained in Comparative Example 1 were evaluated for improving rough skin by the following method, and the results are shown in Table 2. Described.

<Rough skin improvement>
A test was conducted using 10 male employees (ages 25 to 50 years) using a rough skin model induced by a 5 mass% sodium lauryl sulfate (SLS) aqueous solution.
Two 1.5 cmφ parts were provided on the inner part of the forearm, and the percutaneous dissipated water content (TEWL) was measured with "Tevameter TM300" manufactured by Integral Corporation. The absorbent articles produced in Examples 1 to 20 and Comparative Example 1 were cut to a size of 1.5 cmφ, impregnated with 1.5 mL of a 5% SLS aqueous solution, and attached to the inner part of the forearm where TEWL was measured. The affixed absorbent article was fixed with a medical tape (for example, 3M baby skin surgical tape 50 mm) and peeled off after 4 hours. The same operation was performed for 4 consecutive days (4 hours / day). After 4 days, the absorbent article was peeled off, the fixed skin surface was washed with ion-exchanged water, and then the skin surface was dried indoors for 30 minutes, and TEWL was measured. The difference between the TEWL measured before the test and the TEWL measured after the test was defined as "ΔTEWL" and used as an index of rough skin. The larger "ΔTEWL", the more rough skin is. From the results in Table 2, it can be seen that the absorbent article of the present invention has an effect of preventing or improving rough skin.

As can be seen from Table 2, the absorbent article of the present invention was superior in the rough skin improving property while maintaining the water absorption of the aqueous liquid as compared with the absorbent article for comparison. Therefore, when the absorbent article of the present invention is used, it is easily predicted that it will not cause skin rash or the like due to stuffiness of the skin surface.

The absorbent articles of the present invention include children's disposable diapers, adult disposable diapers, napkins, pet sheets, panty liners, incontinence pads, sweat-absorbing sheets, medical blood-absorbing articles, wound protective materials, wound healing agents, surgical waste liquid treatment agents, etc. It is useful for.

Claims (5)

A water-absorbent resin having a water-soluble vinyl monomer (a1) and / or a cross-linked polymer (A) containing a vinyl monomer (a2) which becomes a water-soluble vinyl monomer (a1) by hydrolysis and a cross-linking agent (b) as essential constituent units. An absorbent article comprising an absorber containing particles (P), a liquid diffusion member (B), and a cell activating component (D) .
The surface of the water-absorbent resin particles (P) is coated with 0.01% by weight to 3.0% by weight of an inorganic powder based on the weight of the crosslinked polymer (A). , Absorbent articles . The absorbable article according to claim 1, wherein the cell activating component (D) is at least one selected from the group consisting of an amino acid (D1), a peptide (D2) and a protein (D3). The absorbent article according to claim 1 or 2, wherein the cell activating component (D) is attached to the surface of the water-absorbent resin particles (P) and / or the liquid diffusion member (B). The absorbent article according to any one of claims 1 to 3, wherein the cell activating component (D) is 0.0001 to 1.0% by weight based on the total weight of the water-absorbent resin particles (P). Water-absorbent resin particles (A) having a vinyl monomer (a1) and / or a crosslinked polymer (A) containing a vinyl monomer (a2) which becomes a water-soluble vinyl monomer (a1) by hydrolysis and a crosslinking agent (b) as essential constituent units. A method for producing an absorbent article comprising an absorber containing P), a liquid diffusion member (B), and a cell activator (D).
The surface of the water-absorbent resin particles (P) is coated with 0.01% by weight to 3.0% by weight of an inorganic powder based on the weight of the crosslinked polymer (A).
A method for producing an absorbent article, which comprises applying or spraying a cell activator (D) on the surfaces of the water-absorbent resin particles (P) and the liquid diffusion member (B) in advance before forming the absorber.