JP2002113039A - Absorptive article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorptive article that can suppress the heat history of a medicine and heal the injury with the medicine without rash nor inflammation of a wearer's skin. SOLUTION: In this absorptive article 1 having an absorption layer 4 and a back face layer 3, the medicine having specified effect on the wearer's skin are fixed to the specified part of the absorptive article 1 by a water soluble thickener.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorptive article in which the thermal history of a drug is suppressed, and the drug is used to suppress and cure wounds, rashes and inflammation on the skin of a wearer.

[0002]

2. Description of the Related Art As an absorbent article intended to prevent rash on the skin of a wearer,
For example, Japanese Patent Publication No. 10-509895 and Japanese Patent Publication No.
The thing described in -509896 gazette is known. These publications disclose disposable diapers in which a lotion containing an emollient is applied to a top sheet. This lotion contains an immobilizing agent that immobilizes the emollient to the topsheet.

In the disposable diaper described in the above publication, in order to immobilize the emollient agent on the top sheet, the emollient agent is melted together with the immobilizing agent and then applied to the top sheet. Due to this, the emollient agent is repeatedly exposed for a long time to a high temperature and receives a thermal history. As a result, the emollient often undergoes thermal denaturation or thermal decomposition. In addition, the coexistence with the immobilizing agent hardens the emollient and the immobilizing agent, and easily damages the skin. Furthermore, these agents were difficult to apply uniformly and were uneconomical.

Further, in the disposable diaper described in the above-mentioned publication, since the immobilizing agent is hydrophobic, when the liquid is excreted on the top sheet, the liquid flows along the top sheet. Flow easily occurred, and liquid leakage was easily generated.

[0005] Accordingly, an object of the present invention is to provide an absorbent article capable of suppressing the heat history of a drug and suppressing and healing the wound, rash and inflammation of a wearer's skin by the drug. Another object of the present invention is to provide an absorbent article that can prevent the excreted liquid from flowing. It is a further object of the present invention to provide an absorbent article having improved stability during drying and exhibiting sufficient efficacy when worn, as compared to an absorbent article having only a drug.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an absorbent article having a liquid-retentive absorbing layer and a liquid-impermeable backing layer. The object has been achieved by providing an absorbent article in which a drug having a predetermined effect is fixed by a water-soluble thickener.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the absorbent article according to the present invention will be described below with reference to the drawings, taking a disposable diaper as an example of the absorbent article.

As shown in FIG. 1, the disposable diaper 1 of this embodiment has a surface material 2 as a liquid-permeable surface layer made of a nonwoven fabric or a perforated film and a liquid diaper 1 made of a thermoplastic resin sheet or the like. It has a back material 3 as a transparent back layer, and an absorber 4 as a liquid-retentive absorbing layer interposed between the front material 2 and the back material 3. The absorber 4
A region corresponding to the crotch region of the diaper 1 is formed into a constricted hourglass shape, and the front surface material 2 and the back surface material 3 also include the absorber 4
The area corresponding to the crotch area of the diaper 1 is curved in accordance with the shape of the diaper 1. The absorber 4 is sandwiched and fixed between the front surface member 2 and the back surface member 3.

Back and abdominal waist portions 5 and 5 ′ formed by a front surface member 2 and a back surface member 3 extending outward from front, rear, left and right end portions of the absorber 4, and a pair of leg portions 6. 6, an elastic elastic member 7 for fitting the waist portions 5, 5 'and the leg portions 6, 6 to the wearer's body when the diaper 1 is worn includes the front surface material 2 and the back surface material 3.
Is fixedly provided. A pair of fasteners 8 such as tape fasteners are attached to both ends in the width direction of the back waist portion 5, and a rectangular landing is formed on the back material 3 at the waist portion 5 'on the abdomen side. An adherend (not shown) made of tape or the like is attached. And when the disposable diaper 1 of this embodiment is worn, the fastening tools 8 and 8 will be fixed on a to-be-attached tool. As these members constituting the diaper 1, those similar to those used in conventional disposable diapers are used.

The absorber 4 has particles of a superabsorbent polymer and a nonwoven fabric. The superabsorbent polymer particles are held in the inter-fiber spaces of the nonwoven. The entire surface of the nonwoven fabric holding the particles of the superabsorbent polymer is covered with the tissue paper 11. Thus, the absorber 4 is configured. The absorber 4 having such a configuration is extremely thin as compared with a conventional absorber mainly composed of pulp and particles of a superabsorbent polymer. The fibers constituting the nonwoven fabric include rayon fibers, cotton, hydrophilic fibers such as cellulose acetate, polyolefin fibers such as polyethylene and polypropylene, condensed fibers such as polyester and polyamide, and vinyl monomer polymers such as vinyl chloride and vinyl acetate. And the like. Of these fibers, hydrophobic ones may be used after being rendered hydrophilic by treatment with an oil agent or the like.

The superabsorbent polymer used in the present invention has a water absorption of a physiological saline by centrifugal dehydration of preferably 30 g / g or more, more preferably 30 to 50 g.
/ G, more preferably 35 to 50 g / g. When the water absorption is less than 30 g / g, a superabsorbent polymer is used.
It is necessary to increase the amount of the polymer in the absorber 4 in order to improve the absorbing power, which is not economical, and also results in a thick diaper and lacks portability. The water absorption is measured by the following method.

<Method of measuring water absorption by centrifugal dehydration method of superabsorbent polymer>
After swelling with 50 ml for 30 minutes, the mixture was placed in a 250 mesh nylon mesh bag and centrifuged at 143 G for 1 minute.
Dehydrate for 0 minutes, and measure the total weight after dehydration. Then
According to the following equation (1), the water absorption (g /
g) is calculated.

[0013]

(Equation 1)

The superabsorbent polymer is not particularly limited as long as it satisfies the above-mentioned properties, and specific examples thereof include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, and polyacrylic polymer. Examples thereof include acid sodium crosslinked product, (starch-acrylic acid) graft polymer, (isobutylene-maleic anhydride) copolymer and saponified product thereof, potassium polyacrylate, and cesium polyacrylate. In order to satisfy the above characteristics, for example, a cross-linking density gradient may be provided on the surface of the superabsorbent polymer particles, or the particles of the superabsorbent polymer may be non-spherical amorphous particles. Specifically, JP-A-7
The method described in column 7, line 28 to column 9, line 6 of -184956 can be used.

Further, the superabsorbent polymer used in the present invention has a liquid passage time of 2 hours measured by the following method.
The time of 0 second or less, especially 2 to 15 seconds, prevents the occurrence of gel blocking and a decrease in absorption performance due to the gel blocking, and also prevents the liquid from leaking and leaking due to insufficient absorption. It is preferable from the point of doing. The liquid passage time is measured by the following method.

<Method of measuring liquid passage time> Cross-sectional area 4.91
In a cylinder provided with a cock (inner diameter 4 mmφ) which can be opened and closed at the bottom in cm ² (inner diameter 25 mmφ), with the cock closed, 0.5 g of a superabsorbent polymer was filled together with physiological saline, and the physiological The superabsorbent polymer is swelled with saline until saturation is reached. After the swollen superabsorbent polymer has settled, open the cock and allow 50 ml of saline to pass through. The time required for 50 ml of the physiological saline to pass is measured, and this time is defined as the liquid passage time.

In the diaper 1 of the present embodiment, a drug having a predetermined effect on the skin of the wearer is fixed and held on the skin contact surface by a water-soluble thickener. Specifically, the drug is fixed and held on the surface material 2 of the diaper 1 by the water-soluble thickener. The agent and the water-soluble thickener are applied by applying the aqueous solution or the aqueous dispersion to the surface material 2 and drying (the drying temperature is preferably room temperature or higher and 150 ° C. or lower). As a result, water is interposed during drying to absorb heat, and the chemical is effectively prevented from being thermally denatured or thermally decomposed. As a result, the medicine is applied to the surface material 2 without receiving a heat history, and the effect of the medicine is sufficiently exhibited, and the damage, rash and inflammation of the wearer's skin are effectively suppressed and cured. .

As the drug, any substance can be used without particular limitation as long as it has a predetermined effect on the skin of the wearer. Examples of the drug include the following (1) to
(4).

(1) Humectants, for example, squalane, squalene, 1,3-butylene glycol, propylene glycol, glycerin and the like.

(2) Agents having a skin care effect on the wearer's skin, for example, anti-inflammatory agents such as plant extracts, guaiazulene, tannin, gallic acid derivatives, bisabolol and the like.
"Skin care effect" refers to skin damage, rash prevention,
It means the overall effect of normalizing skin conditions such as anti-inflammatory.

(3) Isopropyl myristyl and isopropyl propanol used as cosmetic oils;
Vaseline, cetanol, stearyl alcohol, 2-ethylhexanoic acid triglyceride and the like.

(4) Organic or inorganic powders which adhere to the skin to reduce friction and give a dry feeling to prevent skin damage, such as silicone beads, nylon beads, sickerol, chitosan beads, Silk powder,
Nε-lauroyl-L-lysine, sodium cetyl phosphate, calcium lauroyl taurine and the like. The particle size of these powders is preferably from 0.05 to 50 μm, particularly preferably from 1 to 20 μm, from the viewpoint of preventing skin damage.

Also, the aforementioned Japanese Patent Application Laid-Open No. 10-509895
And the emollients described in JP-T-10-509895 can also be used as the drug.

Each of the above agents can be used alone or in combination of two or more.

Of the above-mentioned drugs, it is preferable to use a water-soluble or water-dispersible drug because it can be easily mixed with the water-soluble thickener. When a water-soluble or non-water-dispersible drug such as a hydrophobic drug is used, an appropriately selected surfactant may be used in combination to improve dispersibility in water.

In particular, when a plant extract is used as the drug, it has a skin care effect on the wearer's skin and has a substantially decomposing effect on the superabsorbent polymer contained in the absorber 4. It is preferable to use those that do not. The phrase "having substantially no decomposing action on the superabsorbent polymer" means that the polymer has no decomposing action on the superabsorbent polymer and / or substantially has the water absorbing performance of the superabsorbent polymer. It means a case in which it has only a low decomposition action that does not cause a significant reduction. By applying such a plant extract, bodily fluids discharged from the wearer, for example, rash and inflammation of the skin that can be caused by urine or sweat are suppressed,
They also heal when rashes and inflammations occur. Further, the decomposition of the superabsorbent polymer contained in the absorber 4 and the reduction of the absorption performance due to the decomposition are prevented.
The prevention of decomposition of the superabsorbent polymer is particularly effective when the superabsorbent polymer has a high absorption capacity as in the absorber 4 used in the present embodiment.

Examples of the plant extracts include oat extract, seaweed extract (Hibamata), yuzu extract, hamamelis extract, waremokou extract, asunaro extract, aloe extract, oubaku extract, horsetail extract, chamomile extract,
Eucalyptus extract, peach extract and the like can be mentioned. In particular, as a plant extract, by using one or more substances of citron extract, hamamelis extract, asunaro extract, aloe extract, oak extract or peach extract, the skin care effect is further enhanced, and high absorption Decomposition of the polymer is further suppressed, and diaper rash prevention and liquid flow prevention are improved. In particular, when Hamamelis extract or Asunaro extract is used, these effects become remarkable. The plant extract is preferably a 1,3-butylene glycol extract from the viewpoint that explosion-proof measures are not required when heat treatment is performed in the manufacturing process of the absorbent article. In addition, by using the 1,3-butylene glycol extract, 1,3-butylene glycol coexists in the diaper 1, and deterioration of absorption performance is reduced.

As the water-soluble thickener applied together with the drug, polyvinyl alcohol, carboxyalkyl celluloses, thickening polysaccharides and the like are used. One or two or more of these water-soluble thickeners can be used. By the action of these water-soluble thickeners, the drug is stably immobilized on a predetermined portion of the diaper. Also,
Since the water-soluble thickener is water-soluble, the drug can be applied to a predetermined portion of the diaper in the form of an aqueous solution or dispersion thereof and without receiving heat history, and the effect of the drug is impaired. Is prevented. Further, since the water-soluble thickener is water-soluble, when the liquid is excreted, the liquid does not flow on the surface material 2 and the absorbent 4
Since it permeates and diffuses to the liquid, there is no danger of liquid leakage. In addition, since the water-soluble thickener is water-soluble, when the liquid is excreted, the drug fixed by the water-soluble thickener is eluted by the liquid, and the wearer's feeling is increased. Transfers to the skin and makes it easier to adhere.

The water-soluble thickener has a water dissolution temperature of 4
The temperature is preferably 0 to 100 ° C, particularly preferably 60 to 80 ° C, from the viewpoint of immobilization, processability and storage stability of the drug. The water dissolution temperature is measured by the following method.

[Method of Measuring Water Dissolution Temperature] Water-soluble thickener 2
A mixed solution obtained by uniformly mixing 0 parts by weight and 100 parts by weight of water is cast on a glass plate and dried to form a film. The obtained film is cut into a strip having a width of 5 mm, and a measurement piece is collected. The measuring piece is attached to a U-shaped jig, and the jig is immersed in water. The water temperature is gradually increased, and the degree of dissolution of the measurement piece is visually observed. The temperature at which the measurement piece is melted and cut is defined as the water dissolution temperature.

When polyvinyl alcohol is used as the water-soluble thickener, the degree of saponification is more than 85%, especially 9%.
More than 5% and the degree of polymerization is from 1000 to 3000, especially 15
The use of C.O.M.00 to 2500 improves the solubility of the drug in water when wet (that is, improves the release ability of the drug), improves the fixability and processability of the drug when dry, It is preferable from the viewpoint of prevention of generation of odor and prevention of irritation to the skin.

When carboxyalkylcellulose is used as the water-soluble thickener, it is preferable to use a substance having a lower alkyl group such as carboxymethylcellulose or carboxyethylcellulose, for example, to improve the fixability of the drug or the skin of the drug. It is preferable from the viewpoint of easy migration.

When a polysaccharide is used as the water-soluble thickener, natural polysaccharides such as pectin, gellan gum, glucomannan, guar gum, casein and sodium alginate can be used. Polysaccharides that form a gel by forming a crosslinked structure with a polyvalent metal ion can also be used. As the polyvalent metal ion, calcium ion, magnesium ion, barium ion, zinc ion, iron ion, aluminum ion and the like are used. Particularly preferably used polysaccharides are pectin, casein, sodium alginate, gellan gum, and κ-carrageenan from the viewpoint of the fixability of the drug and the ease of transfer of the drug to the skin.

In the present embodiment, the drug and the water-soluble thickener are applied to at least the main absorption region of the surface material 2 for the liquid. The “main absorption region of the liquid” is a region extending from the crotch portion in the front-rear direction, and has a meaning other than a peripheral portion of the surface material 2. Of course, the medicine and the water-soluble thickener may be applied to the entire surface of the surface material 2. Alternatively, it may be applied on the surface material 2 in a stripe shape or intermittently.

Although different depending on the type, the above-mentioned chemical and the water-soluble thickener are used in the main absorption region of the surface material 2 in a total amount of 0.1 g / m ^{2 to} 20 g / m ² , especially 0.5 g / m ² .
m ² ~15g / m ^2, especially that it is coated in an amount of ^{3g / m 2 ~10g / m 2} , that expresses a sufficient effect to the extent that economically feasible, and in terms of touch and absorption performance Is preferred.

The water-soluble thickener is applied in an amount of 5 to 100 parts by weight, especially 10 to 50 parts by weight, based on 1 part by weight of the drug. Is suppressed), and release of the drug when wet is preferred.

The agent and the water-soluble thickener are applied by means of, for example, uniformly mixing them with water and applying the obtained aqueous solution or aqueous dispersion to the surface material 2. When the surface material 2 is composed of a nonwoven fabric, the chemical and the water-soluble thickener may be previously applied to constituent fibers of the nonwoven fabric, and the nonwoven fabric may be formed from the constituent fibers.

When mixing the drug and the water-soluble thickener, the system is heated to the water dissolving temperature of the water-soluble thickener + about 20 ° C. to mix the drug and / or the water-soluble thickener. May be promoted. The concentration of the drug in an aqueous solution or dispersion is 0.01 to 10% by weight, particularly 0.1 to 10% by weight.
1% by weight, and the concentration of the water-soluble thickener is 1 to 50% by weight, particularly 3 to 20% by weight, because the drying efficiency and the viscosity of the aqueous solution or the aqueous dispersion are extremely increased. This is preferred from the viewpoint of avoiding the difficulty of uniform coating and the uniformity of the aqueous solution or aqueous dispersion. The drying temperature of the aqueous solution or the aqueous dispersion is, as described above, from room temperature to 150 ° C.
In particular, the temperature is preferably from 50 to 80 ° C. from the viewpoint of suppressing the heat history of the drug. In addition, drying at room temperature refers to natural drying.

The present invention is not limited to the above embodiment.
For example, in the embodiment, the drug and the water-soluble thickener are applied to the surface material 2 which is a part of the skin contact surface of the diaper 1 (that is, a part of the inner surface of the diaper that can come into contact with the body). However, instead of or together with this, other parts of the skin contacting surface, for example, a nonwoven fabric for forming a three-dimensional guard arranged as necessary, or the above-mentioned agent and the above-mentioned water-soluble thickener in a leg part and a waist part May be applied. In particular,
By applying the drug and the water-soluble thickener in the vicinity of a region where an elastic body is disposed, such as a leg portion or a waist portion, the medicine sufficiently contacts the body by the action of the elastic body, and the medicine is transferred to the body. Of the skin is effectively performed, and the damage to the skin due to the tightening of the elastic body is suppressed.

The absorbent 4 may contain pulp generally used in conventional diapers. in this case,
For 100 parts by weight of pulp, the amount of superabsorbent polymer is 5
It is preferably from 300 to 300 parts by weight.

The absorbent article of the present invention is not limited to the above-mentioned disposable diaper, but can be similarly applied to other absorbent articles such as sanitary napkins, incontinence pads, panty liners, vaginal sheets.

[0042]

EXAMPLES In the following examples, "%" and "parts" mean "% by weight" and "parts by weight", respectively, unless otherwise specified.

Example 1 1 part of the chemical shown in Table 1, 10 parts of polyvinyl alcohol (completely saponified, polymerization degree 1700, water dissolution temperature 60 ° C.), 90 parts by weight of a fiber finishing agent and 90 parts of water
0 parts were mixed at 80 ° C. to obtain a uniform aqueous solution. The fiber finishing agent is mainly an alkyl phosphate sodium salt 30.
Parts and polyoxyethylene alkyl ether sulfate 70
Was a 20% aqueous solution.

A core-sheath type composite fiber (3.3 dtex, fiber length 51) in which the core is polypropylene and the sheath is polyethylene
mm) was immersed in the aqueous solution to allow the aqueous solution to adhere to the composite fiber. The composite fiber was dried at 120 ° C., and the chemicals and polyvinyl alcohol shown in Table 1 were adhered to the composite fiber. Then, using this composite fiber as a raw material, a basis weight of 2
An air-through nonwoven fabric of 5 g / m ² was obtained. The hot air temperature during the production of the nonwoven fabric was 140 ° C. The amount of the drug adhering to this nonwoven fabric was 0.5 g / m ² , and the amount of polyvinyl alcohol adhering was 5 g / m ² , and these were uniformly adhered over the entire area of the nonwoven fabric. The thus obtained nonwoven fabric was used as a surface material of a diaper.

100 parts of NBKP and 100 parts of particles of a superabsorbent polymer (crosslinked polyacrylic acid, water absorption of physiological saline by a centrifugal dehydration method of 50 g / g) were uniformly mixed.
The mixture was wrapped in tissue paper having a basis weight of 15 g / m ² to give a total basis weight of 300 g / m ² , which was used as an absorbent for a diaper.

The above surface material was provided on one side of the absorber, and a polyethylene film was provided on the other side as a back side material.
Further, a known fastening tool, an elastic elastic member, and the like were arranged to obtain a disposable diaper having the form shown in FIG.

Example 2 A disposable diaper was obtained in the same manner as in Example 1 except that carboxymethyl cellulose (water dissolution temperature: 50 ° C.) was used instead of polyvinyl alcohol.

Example 3 A disposable diaper was obtained in the same manner as in Example 1 except that the chemicals shown in Table 1 were used.

Example 4 The procedure of Example 1 was repeated except that an aqueous dispersion obtained by adding 5 parts of an organic powder (nylon beads, average particle size 3 μm) to the aqueous solution used in Example 1 was used. I got a disposable diaper.

Example 5 A disposable diaper was obtained in the same manner as in Example 1 except that the chemicals shown in Table 1 were used.

Comparative Example 1 A disposable diaper was obtained in the same manner as in Example 1 except that polyvinyl alcohol was not used.

Comparative Example 2 A polyolefin wax was used in place of polyvinyl alcohol, and 100 parts of the polyolefin wax was added to 1 part of the chemical shown in Table 1 and a surfactant [polyoxyethylene (10 mol) adduct of hydrogenated castor oil] After premixing with 2 parts, a disposable diaper was obtained in the same manner as in Example 1 except that the mixture was heated to 80 ° C., melted, and applied to the surface material.

[Evaluation of Performance] The disposable diapers obtained in the Examples and Comparative Examples were evaluated for their ability to prevent liquid flow on the surface material and their diaper rash resistance by the following methods. Table 1 shows the results.

[Liquid Flow Prevention Property] A disposable diaper was fixed on a plate inclined at 45 degrees so that its surface material faced upward. 50 g of physiological saline was flowed 200 mm inward from the upper end of the diaper, and the distance at which the physiological saline flowed down on the surface material was measured. The shorter the distance, the higher the liquid flow prevention.

[Diaper rash prevention] The diapers were used by 15 monitors for two weeks, and the degree of diaper rash during that time was evaluated according to the following criteria.

・: No more than two monitors experienced rash. △: 3 or more and 5 or less monitors experienced rash. ×: More than half of the monitors experienced rash.

[0057]

[Table 1]

As is evident from the results shown in Table 1, the disposable diaper of the example (the product of the present invention) is different from the diaper of Comparative Example 2 to which the hydrophobic immobilizing agent (polyolefin wax) is applied. It can be seen that the degree of liquid flow on the surface material is small. In Comparative Example 2, the saline flowed over the polyolefin wax, and the degree of liquid flow increased. In addition, it can be seen that the diaper of the example is not provided with the water-soluble thickener and the diaper rash is suppressed as compared with the diaper of Comparative Example 1 in which the drug is not fixed. Although not shown in the table, the diapers of the examples (particularly, Examples 1 to 1)
No. 4 diaper), the dissolution due to the decomposition of the superabsorbent polymer was suppressed.

[0059]

According to the absorbent article of the present invention, the heat history of the medicine is suppressed, and the rash and inflammation of the skin of the wearer are suppressed and healed by the medicine. Further, according to the absorbent article of the present invention, the excreted liquid is prevented from flowing.

[Brief description of the drawings]

FIG. 1 is a partially broken plan view of a disposable diaper as one embodiment of an absorbent article according to the present invention as viewed from a surface material side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disposable diaper (absorbent article) 2 Surface material 3 Back material 4 Absorber

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) A61F 13/53 F-term (Reference) 3B029 BB07 BD22 4C003 AA12 AA16 AA25 AA26 AA29 BA03 CA06 FA01 HA05 4C098 AA09 CC07 DD23 DD30

Claims (5)

[Claims] 1. An absorbent article having a liquid-retentive absorbing layer and a liquid-impermeable back layer, wherein a drug having a predetermined effect on the skin of a wearer is provided at a predetermined portion of the absorbent article. An absorbent article fixed by a water-soluble thickener. 2. The absorbent article according to claim 1, wherein the drug and the water-soluble thickener are applied to a skin contact surface of the absorbent article. 3. An aqueous solution or aqueous dispersion of the drug and the water-soluble thickener is applied to the predetermined site and dried,
3. The absorbent article according to claim 1, wherein the drug is fixed by the water-soluble thickener. 4. The absorbent article according to claim 1, wherein said water-soluble thickener comprises polyvinyl alcohol, a metal salt of carboxyalkylcellulose, or a thickening polysaccharide. 5. The absorbent article according to claim 1, wherein the water-soluble thickener has a water dissolution temperature of 40 to 100 ° C.