JP4972478B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article that suppresses skin troubles.

Absorbent articles such as sanitary napkins, panty liners, incontinence pads, disposable paper diapers are generally impervious sheets such as polyethylene sheets or polyethylene sheet laminated nonwoven fabrics and liquid permeable surfaces such as nonwoven fabrics or liquid permeable plastic sheets. It has a structure in which an absorbent body made of cotton pulp or the like is interposed between the sheet and the sheet.
In this type of absorbent article, in recent years, various kinds of functional materials, for example, skin care substances added to a surface sheet or the like have been proposed for the gentleness of the wearer to the skin. For example, an oil-soluble skin astringent such as an oil-soluble polyphenol so as not to cause fogging even when worn for a long time (see Patent Document 1), tannin on an absorbent base material to prevent diaper fogging, Reduces irritation with skin containing polyphenols such as gallic acid (see Patent Document 2), application of pH adjuster to absorbent articles to prevent fogging (see Patent Document 3) Therefore, a product containing a lotion composition (see Patent Document 4) has been proposed.
In addition, the present inventor has proposed that a phosphorylcholine group-containing polymer is applied to the skin contact sheet so as not to cause skin troubles even if the person is allergic to chemical or physical irritation. (Patent Document 5). The phosphorylcholine group-containing polymer is a kind of biocompatible substance, and has a moisturizing property, ability to form a protective film, and an effect of suppressing rough skin, and is suitable for a person who is sensitive to chemical or physical irritation. Is particularly preferable as a moisturizing agent for absorbent articles because it can effectively eliminate skin troubles such as fogging, rubbing, and rough skin.
JP 2003-12490 A Japanese Patent Laid-Open No. 3-268751 Japanese Patent Laid-Open No. 2-1265 Special Table 2000-505682 JP 2006-271852 A

However, when a phosphorylcholine group-containing polymer is applied to the skin contact sheet, the hydrophilicity of the skin contact sheet is improved, and liquid residue (water retention) is generated in the skin contact sheet when excretion is absorbed. In the process. When there is such a liquid residue, the wet feeling and the sticky feeling become high, and the wearing feeling deteriorates. Further, the remaining liquid in the skin contact sheet may cause skin troubles depending on the degree.
SUMMARY OF THE INVENTION An object of the present invention is to provide an absorbent article that can supply a skin care substance having a moisturizing effect to the skin while suppressing the deterioration of the wearing feeling due to the liquid residue and the occurrence of skin troubles.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
On the back side of the skin contact sheet that comes into contact with the skin, it has a moisturizer holding sheet coated with a phosphorylcholine group-containing polymer as a moisturizer,
The skin contact sheet is not coated with a moisturizing agent on at least the skin contact surface side,
The skin contact sheet has a passage penetrating the front and back,
When the skin contact sheet is pressed against the moisturizer holding sheet with a pressure contact force of a predetermined level or more, a part of the moisturizer holding sheet protrudes to the surface side of the skin contact sheet through the passage, and the skin contact When the force with which the sheet is pressed against the moisturizing agent holding sheet is less than a predetermined level, a part of the moisturizing agent holding sheet is configured not to protrude to the surface side of the skin contact sheet through the passage.
An absorbent article characterized by the above.

(Function and effect)
In the present invention, the skin contact sheet is not coated with the moisturizing agent on the skin contact surface side, and the skin contact sheet is pressed against the moisturizer holding sheet with a pressing force of a predetermined level or more when the wearer takes a sitting position. When a part of the moisturizer holding sheet protrudes to the surface side of the skin contact sheet through the passage, the moisturizer is supplied to the skin when the protruding portion comes into contact with the skin. If the force with which the skin contact sheet is pressed against the moisturizer holding sheet is less than a predetermined level, such as when the wearer is standing, a portion of the moisturizer holding sheet does not protrude to the surface side of the skin contact sheet. Therefore, while the skin care substance having a moisturizing effect can be supplied to the skin, the moisturizing application site that becomes highly hydrophilic upon absorption is kept at a position far from the skin, and the hydrophilicity of the skin contact sheet is high as in the past. Don't be. Moreover, the hydrophilicity of the moisturizing agent holding sheet located on the back side of the skin contact sheet is increased, and the liquid content of the skin contact sheet is easily transferred to the back side. Therefore, compared with the case where a moisturizer is not simply applied to the skin contact sheet, the effect of preventing the deterioration of the wearing feeling due to the remaining liquid of the skin contact sheet and the effect of preventing skin troubles are further enhanced.

<Invention of Claim 2>
The skin contact sheet is a non-woven fabric having a raw fiber fineness of 0.1 to 10 dtex, a raw fiber length of 1 mm or more, a basis weight of 10 to 100 g / m ² , and a thickness of 0.1 to 10 mm, and the moisturizing agent holding sheet is The fineness of the raw material fiber is 0.1 to 10 dtex, the raw fiber length is 1 mm or more, the basis weight is 10 to 100 g / m ² , and the thickness is 0.1 to 10 mm.
The absorbent article according to claim 1.

(Function and effect)
When the skin contact sheet and the moisturizing agent holding sheet are each non-woven fabric as described in this section, the fibers of the moisturizing agent holding sheet protrude with the fiber gap of the skin contact sheet as a passage in contact with the skin in the projecting action described above. It becomes like this.

<Invention of Claim 3>
The absorbent article according to claim ² , wherein the moisturizer-holding sheet has 1 to 100 hairs / mm ² with a length of 1 mm or more per unit surface area.

(Function and effect)
Since the moisturizing agent holding sheet is raised, the above-described protruding action is more easily exhibited.

<Invention of Claim 4>
The absorbent article according to any one of claims 1 to 3, wherein a part or all of the passage is a plurality of holes or slits formed in the skin contact sheet.

(Function and effect)
It is preferable to punch holes in the skin contact sheet or to cut and form slits because the moisturizing agent holding sheet easily protrudes to the surface side of the skin contact sheet.

<Invention of Claim 5>
The absorbent article according to any one of claims 1 to 4, wherein the phosphorylcholine group-containing polymer is contained in the moisturizing agent-holding sheet at a rate of 0.021 g / m ² or more in terms of solid content.

(Function and effect)
If the content of the phosphorylcholine group-containing polymer is in the range described in this section, a sufficient effect is exhibited. In the present invention, even if the coating amount of the phosphorylcholine group-containing polymer is increased, a liquid residue as in the conventional case is hardly generated, so that the coating amount can be increased as compared with the conventional case, for example, 0.35 g / m ² or more. It can also be.

<Invention of Claim 6>
An absorbent body is interposed between the liquid-permeable top sheet and the back sheet,
The skin contact sheet is the top sheet,
The absorbent article according to any one of claims 1 to 5, wherein the moisturizing agent holding sheet is interposed between the top sheet and the absorbent body.

(Function and effect)
The skin contact sheet and moisturizing agent holding sheet of the present invention are not limited by the site in the article, but as described in this section, a surface sheet covering the surface side of the absorbent body is used as the skin contact sheet of the present invention. The structure in which the moisturizing agent holding sheet is interposed between the top sheet and the absorbent body can be easily applied to many types of absorbent articles. In particular, the part of the moisturizing agent holding sheet is a part where a sheet called a second sheet or an intermediate sheet for improving reversal or the like is interposed in many conventional products, so that there is no significant change in equipment. It can be manufactured.

<Invention of Claim 7>
The at least one of the hollow part in which the said moisturizer holding sheet is accommodated, and the bulging part which contact | abuts the back surface of the said moisturizer holding sheet is provided in the surface by the side of the said skin contact sheet in the said absorber. The absorbent article as described.

(Function and effect)
In this case, since the rigidity of the absorbent body is relatively high, the portion of the moisturizing agent holding sheet that fits in the depression is not applied with a pressure of a predetermined level or higher and does not protrude to the surface side of the top sheet, while the bulging portion The portion that abuts on the surface is applied with a stronger pressure and protrudes higher toward the surface side of the topsheet. Specifically, it is preferable that a bulge is provided in a portion of the absorbent body corresponding to the concave portion of the body surface, and a hollow portion is provided in a portion of the absorbent body corresponding to the convex portion of the body surface. Thereby, the humectant supply action of the present invention can be exhibited evenly.

<Invention of Claim 8>
The absorbent article according to any one of claims 1 to 7, wherein the absorbent article is a sanitary napkin, a panty liner, an incontinence pad, or a disposable paper diaper.

(Function and effect)
The present invention is particularly suitable for these absorbent articles.

  As described above, according to the present invention, while it is possible to supply a skin care substance having a moisturizing effect to the skin, it is possible to suppress the deterioration of the wearing feeling due to the liquid residue and the occurrence of skin troubles. It is.

  The present invention is used for absorbent articles such as sanitary napkins, panty liners, incontinence pads, and disposable paper diapers. FIG. 1 is a partially broken perspective view of a thin sanitary napkin 1. This sanitary napkin 1 includes an absorbent 4 or a crepe paper between a liquid-impermeable back sheet 2 and a liquid-permeable surface sheet 3 (hereinafter simply referred to as a surface sheet), as shown in FIG. The absorbent body 4 surrounded by 5 is interposed, and the moisturizer holding sheet 6 according to the present invention is disposed between the top sheet 3 and the absorbent body 4. Around the absorber 4, the liquid-impermeable back sheet 2 and the top sheet 3 are joined by an adhesive means such as a hot melt adhesive.

  The liquid-impervious back sheet 2 is made of a sheet material having at least water shielding properties such as polyethylene, polypropylene, etc. In addition to this, a non-woven fabric sheet ( In this case, a water-impermeable back sheet is comprised with a waterproof film and a nonwoven fabric.) Etc. can be used. In recent years, those having moisture permeability tend to be suitably used from the viewpoint of preventing stuffiness. The water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. A sheet is preferably used.

  As the absorbent body 4, for example, a material in which a highly water-absorbing resin is mixed in pulp or a material in which chemical fibers are mixed in a pulp and a material having a highly water-absorbing resin is mixed is used. As shown in the figure, it is desirable that the absorbent body 4 is wrapped in an absorbent sheet 5 such as crepe paper in order to keep its shape and rapidly diffuse menstrual blood and prevent reverse return of menstrual blood once absorbed. Pulp includes cellulose fibers such as chemical pulp and molten pulp obtained from wood, and artificial cellulose fibers such as rayon and acetate. It is preferably used in terms of

  Examples of the highly water-absorbing resin include polyacrylate cross-linked products, self-crosslinked polyacrylates, saponified acrylate-vinyl acetate copolymer cross-linked products, cross-linked isobutylene / maleic anhydride copolymer, polysulfone Examples include cross-linked acid salts, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. A highly water-absorbing resin having water absorption performance can adjust the water absorption force and the water absorption speed by adjusting the crosslinking density and the crosslinking density gradient in the production process.

It is desirable that the basis weight of the absorbent 4 is about 50 to 600 g / m ² and the thickness is about 1 to 50 mm. Also, the basis weight of the superabsorbent polymer is desirably about 1~600g / m ^2. If the content of the superabsorbent resin is too small, sufficient absorbability cannot be provided, and if it is too large, the entanglement between the pulp fibers is lost, and twisting or cracking is likely to occur.

  As the surface sheet 3, a perforated or non-porous nonwoven fabric or a porous plastic film sheet is preferably used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, a melt blown method, a needle punch, an air through method, or a point bond method can be used. As the plastic film sheet, for example, olefin resins such as polyethylene and polypropylene, polyamide resins such as polyester and nylon, ethylene-vinyl acetate copolymer (EVA), and the like can be preferably used.

  Characteristically, the top sheet 3 has a passage for projecting a part of the moisturizer holding sheet on the back side to the top side. The passage can be formed by the fiber gap when the top sheet 3 is a fiber assembly sheet such as a nonwoven fabric. Instead of this, or together with this, a passage can be formed by punching the hole 3c in the top sheet 3 or by making a slit.

When the fiber gap of the surface sheet 3 is used as a passage, the raw material has a fineness of 0.1 to 10 dtex, a fiber length of 1 mm or more (particularly 1 to 700 mm), a basis weight of 10 to 100 g / m ² , a thickness of 0 A non-woven fabric of 1 to 10 mm is preferable, and an air-through non-woven fabric and a point bond non-woven fabric are particularly preferable. When a long fiber nonwoven fabric is used, it is difficult to ensure a fiber gap, and therefore it is preferable to provide holes 3c and the like.

If providing holes 3c, etc., but its dimensions are not particularly limited, for example, is preferably open area of the holes is 0.1 to 30 mm ^2, in particular 1 to 10 mm ^2, the length of the slit is 1 to 10 mm, in particular It is preferable that it is 2-5 mm. The slit can also be formed by crossing a cross or the like. If the size of the hole 3c or the like is too large, the moisturizing agent holding sheet easily protrudes even at an unintended level of pressure, and if it is too small, the effect of providing the hole becomes poor.

  Further, the number and arrangement of the holes 3c and the like are not particularly limited, but in the case of the above-described dimensions, the arrangement interval d1 in the width direction is 0.1 to 10 mm, and the arrangement interval d2 in the front-rear direction is 0.1 to 10 mm. It is preferable to determine the number and arrangement. If the distances d1 and d2 are too wide, the amount of moisturizing agent supplied to the skin tends to be uneven, and if it is too narrow, the number of holes 3c and the like will increase so that it becomes close to the conventional one in which the surface sheet 3 is coated with the moisturizing agent. It is not preferable. The holes 3c and the like can be arranged in a staggered arrangement (illustrated example), a lattice (matrix) arrangement, or other regular or irregular arrangement. Further, the holes 3c and the like can be provided only in a partial region of the top sheet 3.

More characteristically, a moisturizing agent holding sheet 6 is disposed between the top sheet 3 and the absorber 4. The humectant holding sheet 6 can be bonded to the top sheet 3 by hot melt adhesive, ultrasonic sealing, heat sealing, heat embossing or the like. As the humectant holding sheet 6, a nonwoven fabric is used as a base material, and a humectant is applied to at least the side of the topsheet 3 by spraying or roll transfer. As the material fiber and the processing method constituting the nonwoven fabric, the same material as the top sheet 3 can be used. In particular, a short fiber nonwoven fabric having a fineness of the raw material fiber of 0.1 to 10 dtex, a fiber length of the raw fiber of 1 mm or more (particularly 1 to 200 mm), a basis weight of 10 to 100 g / m ² , and a thickness of 0.1 to 10 mm is particularly suitable. Nonwoven fabrics and point bond nonwoven fabrics are suitable. Moreover, it is preferable to give uneven | corrugated processes, such as an embossing, in the surface sheet 3 side surface of the moisturizing agent holding sheet 6, and to form raising in the case of a nonwoven fabric. When the surface sheet 3 is a non-woven fabric having the above-mentioned fineness, fiber length, basis weight and thickness, it is preferable that the number of raised hairs having a length of 1 mm or more per unit surface area is 1 to 100 / mm ² . In addition, when non-crimped fibers are used when raising the hair, it is preferable that crimped fibers are used because they tingle against the skin. The hydrophilicity of the humectant holding sheet 6 is preferably higher than that of the top sheet 3 due to the application of the humectant and selection of the type of raw fiber.

  When the top sheet 3 is pressed against the moisturizer holding sheet 6 with a pressing force of a predetermined level or more, a part of the moisturizer holding sheet 6 (in the case of a non-woven fabric, a constituent fiber) ) Protrudes to the surface side of the surface sheet 3, and the moisturizer is transferred to the skin when the protruding portion comes into contact with the skin. When the wearer is standing or the like, when the force with which the top sheet 3 is pressed against the moisturizer holding sheet 6 is less than a predetermined level, a part of the moisturizer holding sheet 6 does not protrude to the front side of the top sheet 3. Therefore, the moisturizer application site where the hydrophilicity becomes high at the time of absorption while being able to supply the moisturizer to the skin is far from the skin and is held on the back surface side of the topsheet 3, and the hydrophilicity of the topsheet 3 as in the past Will not be high. Moreover, the hydrophilicity of the moisturizing agent holding sheet 6 located on the back side of the top sheet 3 is increased, and the liquid content of the top sheet 3 is easily transferred to the back side. Therefore, compared with the case where a moisturizing agent is not simply applied to the top sheet 3, the effect of preventing the deterioration of the wearing feeling due to the remaining liquid of the top sheet 3 and the effect of preventing skin troubles are further enhanced.

  Here, the degree of the pressure in the thickness direction applied to the top sheet 3 varies depending on the part of the body surface that comes into contact. Therefore, it is also preferable to provide at least one of the recessed portion 4c in which the moisturizing agent holding sheet 6 is accommodated and the bulging portion 4b in contact with the back surface of the moisturizing agent holding sheet 6 on the surface of the absorbent body 4 on the surface sheet 3 side. It is. In such a form, since the rigidity of the absorbent body 4 is relatively high, a portion of the moisturizer holding sheet 6 that fits in the recess 4c is not applied with a pressure of a predetermined level or more and protrudes to the surface side of the top sheet 3. On the other hand, the portion that contacts the bulging portion 4b is applied with a stronger pressure and protrudes higher toward the surface side of the topsheet 3. Therefore, for example, in the case of women, the bulging portion 4b is provided in the portion corresponding to the urination port, blood discharge port, and defecation port in the absorber 4, and in the case of men, If the dent 4c is provided and the bulging part 4b is provided at the portion corresponding to the defecation opening, the moisturizing agent supplying action due to the protrusion of the moisturizing agent holding sheet 6 can be exhibited evenly. In addition, since the hollow part 4c and the bulging part 4b of such an absorber 4 can be easily manufactured only by changing the molding shape at the time of fiber stacking when the absorber 4 is a pulp fiber stack, It is preferable.

As the humectant of the present invention, a phosphorylcholine group-containing polymer is used. The phosphorylcholine group-containing polymer is a polymer of 2-methacryloyloxyethylphosphocholine (MPC) having both a phospholipid polar group (phosphorylcholine group) that is a component of a biological membrane and a polymerizable methacryloyl group in one molecule ( Hereinafter referred to as MPC polymer). An excellent moisturizing effect can be given by attaching the MPC polymer to the skin. Furthermore, the MPC polymer forms a hydrated film on the skin surface, thereby blocking physical irritation such as rubbing and chemical irritation by body fluids. It is possible to effectively prevent skin troubles such as blurring, itching, rubbing, and rough skin. In particular, since the MPC polymer has high biocompatibility, even an allergic person can expect the same effect. The content per unit area in the coated part of the MPC polymer is preferably 0.021 g / m ² or more in terms of solid content. If the amount applied is too small, the skin irritation suppressing effect cannot be expected. The larger the coating amount of MPC polymer, the better. However, from the viewpoint of cost effectiveness, it is preferably 1.0 g / m ² or less, particularly preferably 0.5 g / m ² or less.

(Other)
In the above example, the sanitary napkin in which the contact surface with the skin is only the top sheet 3 has been described. However, as shown in FIG. In the case of the sanitary napkin 1A in which the three-dimensional gathers 7 and 7 are formed by the above, the moisturizer holding sheet 6 similar to the above example is interposed on the back side of the top sheet 3, and the three-dimensional gathers 7 and 7 and / or The moisturizing agent holding sheet 6 similar to the above example may be interposed on the back surface side of the side nonwoven fabrics 9 and 9. That is, the three-dimensional gathers 7 and 7 and the side nonwoven fabrics 9 and 9 are different from the top sheet 3 and do not have the absorber 4 on the back side, but are in contact with the skin, and the skin of the present invention. It is included in the contact sheet. These three-dimensional gathers 7 and 7 and side nonwoven fabrics 9 and 9 also have a technical significance in applying the present invention because they become a portion into which the excrement liquid penetrates.

  Moreover, in the above example, the sanitary napkin in which the contact surface with the skin is only the top sheet 3 has been described. However, as shown in FIG. In the case of the sanitary napkin 1A in which the three-dimensional gathers 7 and 7 are formed of the side nonwoven fabric, the surface sheet 3 is provided with irregularities and a moisturizing agent is applied in the same manner as in the above example, and the three-dimensional gathers 7 and 7 and / or The side nonwoven fabrics 9 and 9 may be provided with irregularities, and a moisturizing agent may be applied similarly to the above example. That is, such three-dimensional gathers 7 and 7 and side nonwoven fabrics 9 and 9 do not have an absorber on the back side, unlike the surface sheet 3, but are in contact with the skin, and the skin contact of the present invention. It is included in the sheet. These three-dimensional gathers 7 and 7 and side nonwoven fabrics 9 and 9 also have a technical significance in applying the present invention because they become a portion into which the excrement liquid penetrates.

  In the above example, the case where the present invention is applied is described taking the sanitary napkin as an example. However, as shown in FIG. 3, it can be applied to the disposable paper diaper 1B in exactly the same manner. Therefore, the same reference numerals are given in FIG. Although not shown, the present invention can also be applied to other absorbent articles such as panty liners and incontinence pads.

It is a partially broken perspective view of a sanitary napkin. It is a top view which shows the other example of the sanitary napkin. It is a partially broken perspective view of a disposable diaper.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid-impermeable back surface sheet, 3 ... Liquid-permeable surface sheet, 4 ... Absorber, 5 ... Crepe paper, 6 ... Moisturizer holding sheet.

Claims (8)

On the back side of the skin contact sheet that comes into contact with the skin, it has a moisturizer holding sheet coated with a phosphorylcholine group-containing polymer as a moisturizer,
The skin contact sheet is not coated with a moisturizing agent on at least the skin contact surface side,
The skin contact sheet has a passage penetrating the front and back,
When the skin contact sheet is pressed against the moisturizer holding sheet with a pressure contact force of a predetermined level or more, a part of the moisturizer holding sheet protrudes to the surface side of the skin contact sheet through the passage, and the skin contact When the force with which the sheet is pressed against the moisturizing agent holding sheet is less than a predetermined level, a part of the moisturizing agent holding sheet is configured not to protrude to the surface side of the skin contact sheet through the passage.
An absorbent article characterized by the above. The skin contact sheet is a non-woven fabric having a raw fiber fineness of 0.1 to 10 dtex, a raw fiber length of 1 mm or more, a basis weight of 10 to 100 g / m ² , and a thickness of 0.1 to 10 mm, and the moisturizing agent holding sheet is The fineness of the raw material fiber is 0.1 to 10 dtex, the raw fiber length is 1 mm or more, the basis weight is 10 to 100 g / m ² , and the thickness is 0.1 to 10 mm.
The absorbent article according to claim 1. The absorbent article according to claim ² , wherein the moisturizer-holding sheet has 1 to 100 hairs / mm ² with a length of 1 mm or more per unit surface area.   The absorbent article according to any one of claims 1 to 3, wherein a part or all of the passage is a plurality of holes or slits formed in the skin contact sheet. The absorbent article according to any one of claims 1 to 4, wherein the phosphorylcholine group-containing polymer is contained in the moisturizing agent-holding sheet at a rate of 0.021 g / m ² or more in terms of solid content. An absorbent body is interposed between the liquid-permeable top sheet and the back sheet,
The skin contact sheet is the top sheet,
The absorbent article according to any one of claims 1 to 5, wherein the moisturizing agent holding sheet is interposed between the top sheet and the absorbent body. The at least one of the hollow part in which the said moisturizer holding sheet is accommodated, and the bulging part which contact | abuts the back surface of the said moisturizer holding sheet is provided in the surface by the side of the said skin contact sheet in the said absorber. The absorbent article as described.   The absorbent article according to any one of claims 1 to 7, wherein the absorbent article is a sanitary napkin, a panty liner, an incontinence pad, or a disposable paper diaper.

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