WO2012086476A1 - 吸収性物品 - Google Patents
吸収性物品 Download PDFInfo
- Publication number
- WO2012086476A1 WO2012086476A1 PCT/JP2011/078849 JP2011078849W WO2012086476A1 WO 2012086476 A1 WO2012086476 A1 WO 2012086476A1 JP 2011078849 W JP2011078849 W JP 2011078849W WO 2012086476 A1 WO2012086476 A1 WO 2012086476A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- skin
- care agent
- facing surface
- skin care
- absorbent article
- Prior art date
Links
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 137
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 45
- 239000005871 repellent Substances 0.000 claims abstract description 7
- 239000000835 fiber Substances 0.000 claims description 123
- 230000002745 absorbent Effects 0.000 claims description 68
- 239000002250 absorbent Substances 0.000 claims description 68
- 150000001470 diamides Chemical class 0.000 claims description 25
- 230000004927 fusion Effects 0.000 claims description 17
- 239000006096 absorbing agent Substances 0.000 claims description 11
- 238000010521 absorption reaction Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000470 constituent Substances 0.000 claims description 7
- 150000002191 fatty alcohols Chemical class 0.000 claims description 5
- 210000003491 skin Anatomy 0.000 description 240
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- 238000002844 melting Methods 0.000 description 25
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- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 description 24
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- 239000005020 polyethylene terephthalate Substances 0.000 description 9
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- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 description 2
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- LDVVTQMJQSCDMK-UHFFFAOYSA-N 1,3-dihydroxypropan-2-yl formate Chemical compound OCC(CO)OC=O LDVVTQMJQSCDMK-UHFFFAOYSA-N 0.000 description 1
- ZLENSKMFKIELTB-UHFFFAOYSA-N 4-(2,4-dimethyldocosan-4-yloxy)-2,4-dimethyldocosane Chemical compound CCCCCCCCCCCCCCCCCCC(C)(CC(C)C)OC(C)(CC(C)C)CCCCCCCCCCCCCCCCCC ZLENSKMFKIELTB-UHFFFAOYSA-N 0.000 description 1
- MDLSDIRYRKOFCJ-UHFFFAOYSA-N 4-(2,4-dimethylicosan-4-yloxy)-2,4-dimethylicosane Chemical compound CCCCCCCCCCCCCCCCC(C)(CC(C)C)OC(C)(CC(C)C)CCCCCCCCCCCCCCCC MDLSDIRYRKOFCJ-UHFFFAOYSA-N 0.000 description 1
- DPISTHRTKLHIMU-UHFFFAOYSA-N 4-(2,4-dimethyloctadecan-4-yloxy)-2,4-dimethyloctadecane Chemical compound CCCCCCCCCCCCCCC(C)(CC(C)C)OC(C)(CC(C)C)CCCCCCCCCCCCCC DPISTHRTKLHIMU-UHFFFAOYSA-N 0.000 description 1
- FJWPTALGCKMQMB-PTYZJIDKSA-N C(CCCCCCCCCCCCCCC(C)C)C1[C@@H]([C@]2(CC[C@@H]3[C@]4(CC[C@@H](CC4=CC[C@H]3[C@@H]2C1)O)C)C)[C@H](C)CCCC(C)C Chemical compound C(CCCCCCCCCCCCCCC(C)C)C1[C@@H]([C@]2(CC[C@@H]3[C@]4(CC[C@@H](CC4=CC[C@H]3[C@@H]2C1)O)C)C)[C@H](C)CCCC(C)C FJWPTALGCKMQMB-PTYZJIDKSA-N 0.000 description 1
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- 229920002302 Nylon 6,6 Polymers 0.000 description 1
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- 229930006000 Sucrose Natural products 0.000 description 1
- BHEOSNUKNHRBNM-UHFFFAOYSA-N Tetramethylsqualene Natural products CC(=C)C(C)CCC(=C)C(C)CCC(C)=CCCC=C(C)CCC(C)C(=C)CCC(C)C(C)=C BHEOSNUKNHRBNM-UHFFFAOYSA-N 0.000 description 1
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- JXTPJDDICSTXJX-UHFFFAOYSA-N n-Triacontane Natural products CCCCCCCCCCCCCCCCCCCCCCCCCCCCCC JXTPJDDICSTXJX-UHFFFAOYSA-N 0.000 description 1
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- 239000003921 oil Substances 0.000 description 1
- 235000019198 oils Nutrition 0.000 description 1
- 239000004006 olive oil Substances 0.000 description 1
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- 235000019809 paraffin wax Nutrition 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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- TUHBEKDERLKLEC-UHFFFAOYSA-N squalene Natural products CC(=CCCC(=CCCC(=CCCC=C(/C)CCC=C(/C)CC=C(C)C)C)C)C TUHBEKDERLKLEC-UHFFFAOYSA-N 0.000 description 1
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- UFTFJSFQGQCHQW-UHFFFAOYSA-N triformin Chemical compound O=COCC(OC=O)COC=O UFTFJSFQGQCHQW-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
- A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
- A61F13/51113—Topsheet, i.e. the permeable cover or layer facing the skin comprising an additive, e.g. lotion or odour control
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
- A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
- A61F13/51104—Topsheet, i.e. the permeable cover or layer facing the skin the top sheet having a three-dimensional cross-section, e.g. corrugations, embossments, recesses or projections
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
- A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
- A61F13/51113—Topsheet, i.e. the permeable cover or layer facing the skin comprising an additive, e.g. lotion or odour control
- A61F2013/51117—Topsheet, i.e. the permeable cover or layer facing the skin comprising an additive, e.g. lotion or odour control the lotion having skin care properties
Definitions
- the present invention relates to an absorbent article such as a disposable diaper, a sanitary napkin, a panty liner (orimono sheet), an incontinence pad, and the like.
- Patent Document 1 describes an absorbent article in which a lotion composition containing an emollient and a fixing agent is applied to a top sheet in a non-uniform pattern.
- Patent Document 2 a lotion is applied to a liquid-permeable top sheet in the form of a pattern composed of a plurality of strips, and the strips are separated by a plurality of regions not provided with a lotion.
- a disposable absorbent article is described in which the pattern consisting of is a discontinuous pattern.
- the applicant first applies a diamide derivative having a specific structure that moves to the skin of the wearer and functions as an oily skin care agent on the surface of the absorbent article that is applied to the wearer's skin when worn. (Refer to Patent Document 3).
- Patent Documents 1 and 2 describe that a lotion composition corresponding to a skin care agent is partially applied to a surface sheet in a predetermined pattern.
- the present invention relates to an absorbent article that can stably hold a skin care agent at a site that is easily transferred to the skin, and is excellent in skin care effect and its sustainability.
- the present invention provides an absorbent article comprising a liquid-permeable top sheet made of non-woven fabric, a liquid-impermeable or water-repellent back sheet, and an absorber disposed between the two sheets.
- the top sheet has a number of protrusions that protrude toward the wearer's skin.
- the protrusion has an internal space where the absorber side is open.
- the protrusion has the skin care agent attached to both the skin facing surface and the non-skin facing surface at the top.
- the skin facing surface has a larger amount of skin care agent per unit area than the non-facing surface at the top.
- FIG. 1 is a partially broken plan view showing a disposable diaper that is an embodiment of the absorbent article of the present invention.
- FIG. 2 is a perspective view of a top sheet used in the diaper shown in FIG.
- FIG. 3 is an explanatory view showing the distribution of the skin care agent in the XX section of the top sheet shown in FIG.
- FIG. 4 is an explanatory diagram showing the distribution of the skin care agent in the YY section of the top sheet shown in FIG.
- FIG. 5 is a schematic cross-sectional view taken along the line DD of the top sheet shown in FIG.
- FIG. 6 is a schematic plan view showing the arrangement of the protruding portion and the bottom portion of the topsheet shown in FIG.
- FIG. 7 is a figure showing an example of a manufacturing method of a nonwoven fabric which constitutes a surface sheet.
- FIG. 8 (a) is an explanatory view showing an example of a method for attaching a skin care agent
- FIG. 8 (b) is a schematic view showing an enlarged main part in FIG. 8 (a).
- FIG. 9 is an explanatory view showing another embodiment of the present invention.
- FIG. 10 is a drawing-substituting photograph in which a cross section corresponding to FIG. 2 of the nonwoven fabric produced in the example is imaged.
- FIG. 11 is a drawing-substituting photograph in which a cross section in a state when the nonwoven fabric shown in FIG. 10 is pressed in the thickness direction is imaged.
- FIG. 10 is a drawing-substituting photograph in which a cross section in a state when the nonwoven fabric shown in FIG. 10 is pressed in the thickness direction is imaged.
- FIG. 12 is a drawing-substituting photograph obtained by imaging the nonwoven fabric produced in the example from the side facing the skin side.
- FIG. 13 is a schematic cross section which shows the pressurization preservation
- FIG. 14 is a diagram illustrating an example of an FT-IR spectrum.
- FIG. 15 is a graph showing the evaluation results of the examples.
- FIG. 1 is a plan view showing the disposable diaper 1 according to the first embodiment of the present invention, partially broken away.
- the disposable diaper 1 of the first embodiment (hereinafter, also simply referred to as diaper 1) includes a liquid-permeable top sheet 10, a liquid-impermeable or water-repellent back sheet 30, and a space between these two sheets.
- the liquid-retaining absorbent 40 is provided.
- the diaper 1 has the back side part A distribute
- side sheets 70 made of a water-repellent nonwoven fabric are disposed so as to cover both side portions of the topsheet 10.
- the top sheet 10 and each side sheet 70 are joined to the back sheet 30 at a position outside the periphery of the absorber 40.
- An elastic member 71 for forming leg gathers is disposed on the leg flap portion located outside the side edge of the absorber 40.
- An elastic member 72 for forming a three-dimensional gather is disposed on the side edge of the side sheet 70 on the center side in the diaper width direction.
- the diaper 1 is a so-called unfolded diaper, by fastening fastening tapes 50, 50 provided on both side edges of the back side A to a landing tape 60 provided on the outer surface of the abdominal side C.
- the absorber 40, the fastening tape 50, the landing tape 60, the side sheet 70, and the elastic members 71 and 72 those used for this type of article can be used without any particular limitation. it can.
- the absorbent body 40 is formed by coating a fiber assembly made of a fiber material such as pulp fiber or a core wrap sheet made of tissue paper, a water-permeable nonwoven fabric, or the like holding a water absorbent polymer particle or the like. A thing etc. can be used.
- the surface sheet 10 in 1st Embodiment consists of a nonwoven fabric as shown in FIG. 2, and has many protrusion parts 11 which protrude toward a wearer's skin side.
- Each protrusion 11 has an internal space 11a that is open on the absorber side (lower side in FIG. 2).
- the skin care agent 13 has adhered to both surfaces of the skin opposing surface 12a and the non-skin opposing surface 12b in the top part 12, and the protrusion part 11 has a top part rather than the non-skin opposing surface 12b of the top part 12.
- Twelve skin facing surfaces 12a have a larger amount of skin care agent per unit area.
- the protrusions 11 of the topsheet 10 form a protrusion row L11 in which a plurality of the protrusions 11 are arranged in series in the X direction at a predetermined pitch Px (see FIG. 4).
- a plurality of rows are formed at a predetermined pitch Py (see FIG. 3) in the Y direction intersecting the X direction.
- the X direction and the Y direction are one direction in the plane of the topsheet 10 and its intersecting direction.
- the X direction and the Y direction are used when the nonwoven fabric 10 ′ and the topsheet 10 described later are manufactured. It coincides with the machine direction (MD) and its cross direction (CD).
- the X direction and the Y direction are orthogonal to each other.
- the top sheet 10 has a large number of rhombus regions R11 (see FIG. 6) having a substantially rhombus shape in plan view (the example illustrated in FIG. 6 is a substantially square shape) in which the center of the protruding portion 11 is located at each of the four corners. Is formed. And the center part of the rhombus area
- the protruding portion 11 has a convex-curved top portion 12 in which the cross section in the X direction and the Y direction forms a convex arc shape toward the skin side, and the bottom portion 21 has a cross section in the X direction and the Y direction. All of them are concavely curved toward the skin side.
- the convex-curved top portion 12 has a semicircular shape or a truncated cone shape with a rounded tip.
- the concave bottom portion 21 has a concave curved surface shape when viewed from the skin side, but has a semicircular shape, a circular column with a rounded tip, or a truncated cone shape when viewed from the absorber 4 side. As shown in FIGS.
- the side wall 3 is interposed between the top 12 of the protrusion 11 and the concave bottom 21, and the top 12, the side wall 3, and the bottom 21 are arranged in the X direction and It continues in a continuous wave shape in the cross section in the Y direction.
- the top portions 12 of the projecting portions 11 are connected via the ridge portion 16.
- the top 12 of one protrusion 11, the ridge 16, and the top 12 of the other protrusion 11 are continuous in a continuous wave shape.
- the skin care agent 13 is also attached to the skin facing surface 3 a of the side wall portion 3 that appears in the cross section in the X direction and the Y direction.
- the skin facing surface 3a of the side wall 3 has a smaller amount of skin care agent per unit area than the skin facing surface 12a of the top portion 12.
- the skin care agent 13 is also attached to the skin facing surface 21 a of the bottom portion 21.
- the skin facing surface 21a of the bottom 21 and the skin facing surface 3a of the side wall 3 have substantially the same amount of skin care agent per unit area.
- the skin care agent amount of the non-skin facing surface 12b of the top portion 12 is considerably smaller than the skin care agent amount of the skin facing surface 12a of the top portion 12, and the skin care agent amount per unit area of the skin facing surface 12a of the top portion 12 is Considering from the relationship of the amount of skin care agent per unit area on the skin facing surface 3a of the side wall part 3, the skin care agent 13 is not substantially attached to the non-skin facing surface 3b of the side wall part 3 or the side wall part. It is inferred that the skin care agent 13 is attached only in a remarkably small amount as compared with the skin facing surface 3a. On the other hand, the adhesion amount of the skin care agent 13 on the skin facing surface 3 a of the side wall 3 is larger than the adhesion amount of the skin care agent 13 on the non-skin facing surface 12 b of the top portion 12.
- the amount of the skin care agent 13 on the side wall portion 3 is such that the thickness (T) of the topsheet 10 when no pressure is applied is divided into three equal parts, and the topsheet 10 in the thickness direction.
- the skin care agent amount is measured by dividing the region into three regions P1 to P3 and using the portion located in the central region P2 as the side wall portion 3.
- the thickness (T) of the topsheet 10 when no pressure is applied is measured by the method described later.
- the top part 12 acquires a test piece from the center part of the protrusion part 11 in planar view of the surface sheet 10, and performs the measurement of the skin care agent amount demonstrated in the Example mentioned later.
- the skin care agent amount at the bottom 21 is measured by obtaining a test piece from the center of the bottom 21 in plan view of the topsheet.
- the amount of the skin care agent in the side wall 3 is measured by obtaining a test piece from the central region P2 (preferably an intermediate portion between the top 21 and the bottom 21).
- the skin care agent 13 is not substantially attached to the non-skin facing surface 21b of the bottom portion 21 of the top sheet 10 of the present embodiment, or is significantly less than the skin facing surface 3a of the side wall portion 3. Only the amount of skin care agent is attached.
- the skin care agent used in the present invention those having effects such as protection and healing on the wearer's skin can be used without particular limitation.
- a diamide derivative represented by the following formula (I) described in Patent Document 3 can be mentioned.
- the diamide derivative represented by the above formula (I) is a diamide derivative of the invention described in International Publication No. WO00 / 61097, and has a medicinal effect of improving the water retention ability and barrier function of the stratum corneum. is doing.
- the diamide derivative held on the top part 12 or the side wall part 3 of the protruding part 11 shifts to the wearer's skin during wearing of the absorbent article, it functions as an oily skin care agent and suppresses / improves skin irritation. be able to.
- diamide derivative when using the above diamide derivative, only one diamide derivative may be used, or two or more diamide derivatives may be used in combination.
- the oil-based skin care agent etc. which are used as an emollient agent in the field
- area of cosmetics can be used, for example.
- the other skin care agents include liquid paraffin, silicone oil, animal and vegetable oils (olive oil, jojoba oil, safflower oil, squalane and squalene, etc.), monoglyceride, diglyceride, triglyceride, aliphatic ether (myristyl-1,3- Dimethylbutyl ether, palmityl-1,3-dimethylbutyl ether, stearyl-1,3-dimethylbutyl ether, palmityl-1,3-methylpropyl ether, stearyl-1,3-methylpropyl ether), isostearyl-cholesterol ester, paraffin waxes, C 12 ⁇ C 22 fatty acids, C 12 ⁇ C 44 fatty ethers, C 12 ⁇ C 22 fatty
- a mixture of a C 12 to C 22 fatty alcohol (preferably stearyl alcohol) and a diamide derivative of the above formula (I) can be preferably used.
- the mixing ratio of stearyl alcohol to the diamide derivative of the above formula (I) has the ability to transfer the skin care agent to the skin, the skin care effect, the feel during use, and the permeability of the body fluid to the top sheet. From the viewpoint, it is preferably 90/10 to 50/50 (mass%).
- These mixtures are preferably applied to the nonwoven fabric 10 'after heating to increase its fluidity. After adhering to the nonwoven fabric 10 ′, it is left at room temperature to reduce the fluidity and make it easier to hold on the topsheet 10.
- the diaper 1 of this embodiment can be worn and used in the same manner as a normal unfolded diaper.
- the topsheet 10 is incorporated in the diaper 1 with the surface from which the protruding portion 11 protrudes facing the skin and the concave bottom portion 21 in contact with or close to the absorber 40.
- the X direction of the surface sheet 10 corresponds with the longitudinal direction (X 'direction) or the width direction (Y' direction) of the diaper 1, it is not restricted to it.
- the skin sheet 13 is held on the skin facing surface 12a of the top portion 12 of the protruding portion 11 that is in contact with the skin of the wearer, and therefore the skin care agent 13 is transferred to the skin. High in skin properties and excellent skin care effects. Moreover, since the skin care agent 13 is also present on the non-skin facing surface 12b of the top portion 12, the skin care agent on the skin facing surface 12a side moves to the non-facing surface side 12b even when the protruding portion 11 is pressed against the skin. Hard to do. Therefore, the skin care agent is stably held on the skin contact surface 12a of the top portion 12, and the durability of the skin care effect is excellent.
- the skin care agent 13 present on the non-skin facing surface 12b of the top portion 12 is smaller than that of the skin facing surface 12a, the skin care agent 13 left on the top sheet 10 can be reduced, and the surface An effective amount can be efficiently transferred to the skin by applying a small amount of the skin care agent 13 to the sheet 10 as a whole.
- the surface sheet 10 in the diaper 1 of this embodiment is the amount of retention of the skin care agent 13 without leaving the surface sheet 10 as a whole. Can do more.
- the skin care agent 13 applied to the side wall portion 3 that is difficult to touch the skin remains on the side wall portion 3, so that the skin care agent 13 of the top portion 12 becomes the side wall portion. 3, and the skin care agent 13 is more stably held on the skin contact surface 12 a of the top portion 12.
- the side wall 3 is caused by the movement of the wearer. Even when the skin care agent 13 applied to the side wall portion 3 by being pressed by the body becomes easy to flow at body temperature, the skin care agent on the skin facing surface 21a of the bottom portion 21 remains fixed. The skin care agent 13 on the skin-facing surface 3a of the side wall 3 is less likely to move, and the skin care agent 13 on the top 12 is more stably held.
- the skin care agent 13 is an oily thing, or it is easy to reduce hydrophilicity, or a liquid Even when the permeability is likely to be lowered, the side wall 3 maintains a relatively good liquid permeability. Therefore, liquid can be absorbed quickly after excretion and liquid leakage can be prevented.
- the surface sheet 10 is required to have a characteristic of allowing the excreted liquid to smoothly pass through the absorber. If the top sheet 10 is water repellent, the liquid cannot be smoothly transmitted.
- the surface sheet 10 is preferably subjected to a hydrophilic treatment. Applying the hydrophilic treatment leads to reducing the contact angle of the topsheet 10 with the ion exchange water. The smaller the value of the contact angle with water, the higher the hydrophilicity. When the present inventors examined this contact angle, it was found that the contact angle can be easily reduced when the skin care agent adheres to the top sheet 10 in the state described above.
- the top sheet 10 and ion-exchanged water are used. Is preferably 55 ° to 90 °, more preferably 60 ° to 90 °, and even more preferably 60 ° to 75 °.
- the range of the contact angle is a range in which the top sheet can smoothly transmit the liquid.
- the contact angle can be easily set within the above range. Can be adjusted in.
- the specific method for measuring the contact angle is as follows.
- a contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used for the measurement of the contact angle.
- the contact angle is measured immediately using the contact angle meter.
- the measurement is performed at five or more locations on the surface sheet, and the average value thereof is used as the contact angle.
- the measurement temperature is 22 ° C.
- the whole nonwoven fabric constituting the top sheet 10 may be composed of a single type of fibers having the same fineness, or may be composed of a plurality of types of fibers having different finenesses. It is also preferable to make the fineness of the constituent fibers different between the skin facing surface and the non-skin facing surface. For example, after forming a first fiber web made of fibers with a small fiber diameter on one card machine, a second fiber web made of fibers with a large fiber diameter produced by another card machine is joined on it. By introducing the obtained laminated web into the web shaping device 5 described later with the first fiber web side facing the pedestal 53 side, the fineness of the constituent fibers is greater on the skin facing surface than on the non-skin facing surface. A small surface sheet is obtained.
- the skin-facing surface has a smaller fineness (fiber diameter) than the non-skin-facing surface, so the skin care agent can be held on a soft surface and fits easily on the skin, making it easier to transfer the skin care agent to the skin. can do.
- the surface sheet 10 in the present embodiment adheres more skin care agent 13 to the skin facing surface 12a of the top portion 12 of the protrusion 11 than the non-skin facing surface 12b on the nonwoven fabric 10 ′ having the above-described three-dimensional shape. It is obtained by applying to.
- An example of a preferable manufacturing method is shown in FIG. 7. As shown in FIG. 7, a fiber web 10 ⁇ / b> A formed to have a predetermined thickness by a card machine 51 is provided with a base 53 having a large number of protrusions 52 and air permeability. The web shaping device 5 is supplied.
- the wind 54 is blown against the fiber web 10 ⁇ / b> A supplied on the pedestal 53, and the fiber web 10 ⁇ / b> A is deformed into a shape generally along the surface shape of the pedestal 53 having the protrusions 52.
- the temperature T 1 of the wind 54 is at least 50 ° C. lower than the melting point Mp of the low melting point component which is the sheath component of the thermoplastic fiber constituting the fiber web, for example, the core-sheath type composite fiber, and 10 ° C. above this melting point. It can be set below the high temperature (ie, Mp-50 to Mp + 10).
- hot air 55 is blown onto the fiber web 10A on the pedestal 53 to deform the fiber web into a shape along the protrusions 52 and heat-bond the intersections of the fibers to form a three-dimensional shape.
- the melting point Mp of the low melting point component which is the sheath component of the thermoplastic fiber constituting the fiber web, for example, the core-sheath type composite fiber, is set.
- it is preferably 0 to 70 ° C., more preferably 5 to 50 ° C.
- thermoplastic fiber examples include polyolefins such as polypropylene and polyethylene, polyesters, polyamides such as nylon 6 and nylon 66, polyacrylonitriles, and the like, or a core-sheath type or a side-by-side type composite composed of two or more of these.
- a fiber etc. can be mentioned.
- the temperature of the hot air blown onto the fiber web is preferably equal to or higher than the melting point of the low melting point component and lower than the melting point of the high melting point component.
- the temperature of the hot air blown to the fiber web is more preferably the melting point of the low melting point component + 0 ° C.
- the fiber web and the nonwoven fabric preferably contain 30 to 100% by mass of thermoplastic fibers, more preferably 40 to 80% by mass.
- the fiber web and the nonwoven fabric may contain fibers that do not inherently have heat-fusibility (for example, natural fibers such as cotton and pulp, rayon, and acetate fibers).
- the wind speed of the hot air when shaping the fiber web is more preferably 20 to 130 m / second, more preferably 30 to 100 m / second, from the viewpoints of shapeability and texture.
- the pedestal 53 is a conveyor type, and the nonwoven fabric 10 ′ having a three-dimensional shape is wound up by a roll 57.
- the fiber material that can be used for the nonwoven fabric is not particularly limited. Specific examples include the following fibers. Polyolefin fibers such as polyethylene (PE) fibers and polypropylene (PP) fibers; fibers using a thermoplastic resin such as polyethylene terephthalate (PET) and polyamide alone; composite fibers having a structure such as a core-sheath type and a side-by-side type, such as A core-sheath structure fiber in which the sheath component is polyethylene or low-melting-point polypropylene is preferable, and typical examples of the core / sheath structure fiber include PET (core) / PE (sheath), PP (core) / PE ( Sheath), fibers having a core-sheath structure such as PP (core) / low melting point PP (sheath).
- PE polyethylene
- PP polypropylene
- PP polypropylene
- the constituent fibers preferably include polyolefin fibers such as polyethylene fibers and polypropylene fibers, polyethylene composite fibers, and polypropylene composite fibers.
- the composite composition of the polyethylene composite fiber is polyethylene terephthalate / polyethylene
- the composite composition of the polypropylene composite fiber is preferably polyethylene terephthalate / low melting point polypropylene, and more specifically, PET (core). / PE (sheath), PET (core) / low melting point PP (sheath).
- PET core
- PE sheath
- PET (core) / low melting point PP low melting point PP
- the fiber density at the top portion 12 of the protruding portion 11 is smaller than the fiber density at the bottom portion 21.
- the concave bottom portion 21 is not easily crushed, is excellent in retention after excrement is collected, is excellent in cushioning properties, and is excellent in diffusion prevention of the collected matter without being deformed.
- the fiber density of the side wall part 3 has an intermediate fiber density between the fiber density of the top part 12 of the protrusion part 11 and the fiber density of the bottom part 21. The fiber density was evaluated by measuring the number of fibers per 1 mm 2 .
- the fiber density at the top of the protrusion is preferably 30 fibers / mm 2 to 130 fibers / mm 2, and more preferably 50 fibers / mm 2 to 100 fibers / mm 2 .
- the fiber density at the bottom 21 is preferably 250 fibers / mm 2 to 500 fibers / mm 2 , and more preferably 300 fibers / mm 2 to 450 fibers / mm 2 .
- the difference of the fiber density in a protrusion part and the fiber density in the bottom part 21 is 150 pieces / mm ⁇ 2 > or more.
- a skin care agent 13 is applied to the obtained nonwoven fabric 10 ′.
- the skin care agent 13 is preferentially attached to the skin facing surface 12 a of the top 12 of the protrusion 11.
- the nonwoven fabric 10 ′ is introduced directly or through a breathable member 40A such as an absorbent continuum on the breathable conveyor 56,
- this method as shown in FIG.
- the air 6 containing the skin care agent 13 flows in a large amount through the top portion 12 of the protruding portion 11 having a low fiber density, while the bottom portion 21 having a high fiber density.
- the air 6 containing the skin care agent 13 hardly flows.
- a small amount of air 6 containing the skin care agent 13 flows in the side wall portion 3 having an intermediate fiber density as compared with the top portion 12.
- the top sheet 10 preferably has a thickness (T p ) under a pressure of 3.5 ⁇ 10 3 Pa of 20 to 70% of the thickness (T) under non-pressurization, preferably 30 to 60 % Is more preferable. If it is below the upper limit value, it is preferable because it deforms flexibly when the wearer moves or sits down and hardly feels hardness. If it is more than the said lower limit, since a nonwoven fabric will not be crushed completely and the solid shape can be hold
- the method for measuring the thickness (T p ) under pressure is as described above.
- the number of fiber fusion points (n 1 ) in the protruding portion 11 is less than the number of fiber fusion points (n 2 ) in the bottom portion 21.
- the protrusion part 11 it can be crushed moderately with respect to a press, and the favorable skin contact can be implement
- the concave bottom portion 21 is not easily crushed, has excellent shape retention after collecting excrement, and has excellent cushioning properties and excellent antidiffusion properties of the collected material without collapsing.
- the number of fiber fusion points was derived by counting the number of fiber fusion points per 1 mm 2 .
- the number of fiber fusion points n 1 is preferably 30 pieces / mm 2 to 130 pieces / mm 2 and more preferably 50 pieces / mm 2 to 100 pieces / mm 2 for the above reasons.
- the fiber fusion point number n 2 is preferably 250 / mm 2 to 500 / mm 2 and more preferably 300 / mm 2 to 450 / mm 2 for the above reasons.
- ⁇ Measurement of the number of fiber fusion points> The cut surface of the nonwoven fabric portion was magnified and observed using a microscope (50 to 150 times), and the number of fiber fusion points per 1 mm 2 was counted. Microscope: JCM-5100 (trade name) manufactured by JEOL Ltd.
- the thickness of the topsheet 10 of this embodiment is preferably 2 mm to 6 mm, and more preferably 3 mm to 5 mm.
- the basis weight of the topsheet 10 is preferably 15 ⁇ 50g / m 2, more preferably 20 ⁇ 40g / m 2.
- the coating method include a die coater method, a slot spray method, a curtain spray method, a melt blown method, a spiral spray method, a gravure method, and a bead method.
- the skin care agent can also be applied simultaneously or sequentially from the respective sides to the skin facing surface and the non-skin facing surface of the nonwoven fabric shaped into a three-dimensional shape as a base material for the topsheet.
- the bottom portion 21 of the topsheet 10 has a concave curved surface shape that is concave toward the skin side, but the bottom portion 21 may be flat.
- a truncated cone or a columnar protrusion may protrude from the flat bottom, and the top of the protrusion may be a convex curved surface.
- the surface sheet is not limited to the one in which the protrusions holding the skin care agent are distributed over the entire area, and the protrusions are distributed only in a part of the X direction and / or the Y direction in FIG. There may be.
- the protrusions may be distributed only in the range of the hatched portion in the topsheet 10 of the diaper shown in FIG. 9, or the protrusions are distributed over the entire surface of the topsheet 10, but the range of the hatched portion thereof
- the skin care agent may be held only in the protruding portion inside.
- An absorbent article comprising a liquid-permeable top sheet composed of a nonwoven fabric, a liquid-impermeable or water-repellent back sheet, and an absorbent body disposed between the two sheets,
- the topsheet has a number of protrusions protruding toward the skin side of the wearer, the protrusion has an internal space where the absorber side is open,
- the protruding portion has a skin care agent attached to both the skin facing surface and the non-skin facing surface at the top, and the amount of skin care agent per unit area is greater on the skin facing surface than on the non-skin facing surface on the top.
- the protruding portion has a skin care agent attached to the skin facing surface in the side wall portion, and the skin facing surface of the side wall portion has a smaller amount of skin care agent per unit area than the skin facing surface of the top portion.
- the projecting portion has a convex curve-shaped top portion in which the cross section in one direction X and the Y direction orthogonal to the one in the plane of the topsheet forms a convex arc shape toward the skin side
- the top sheet further has a concave bottom portion that is recessed relative to the protruding portion, and the bottom portion has a concave curved surface shape in which both cross sections in the X direction and the Y direction are concave toward the skin side.
- the protrusions form a protrusion row arranged in series in one direction X in the plane of the topsheet, and the protrusion rows are formed in a plurality of rows in the Y direction perpendicular to the X direction.
- the absorptivity according to any one of [1] to [4], wherein the positions of the protrusions are shifted in the X direction by a half pitch of the pitch between the protrusions.
- the surface sheet has the amount of the skin care agent attached to the skin facing surface of the side wall portion larger than the amount of the skin care agent attached to the non-skin facing surface of the top portion according to any one of [1] to [5].
- the protrusion is an absorbent article according to any one of [1] to [7], in which a skin care agent is not attached to the non-skin facing surface of the side wall.
- the top sheet further has a concave bottom portion that is recessed relative to the protruding portion, and no skin care agent is attached to the non-skin facing surface of the bottom portion 21. Any one of [1] to [8] An absorbent article according to any one of the above.
- the top sheet is an absorbent article according to any one of [4] to [9], wherein the number of fiber fusion points n 1 at the protruding portion is smaller than the number of fiber fusion points n 2 at the bottom.
- the absorbent article according to [10] wherein the number of fiber fusion points n 1 is 30 / mm 2 to 130 / mm 2 .
- the fiber density in the top of the protrusions 30 present / mm 2 ⁇ 130 present / mm 2 is preferred, any one of from more preferably (1) 50 to present / mm 2 ⁇ 100 present / mm 2
- the topsheet further has a concave bottom that is recessed relative to the protrusion,
- the fiber density in the bottom portion is preferably 250 lines / mm 2 ⁇ 500 present / mm 2, according to any one of from 300 lines / mm 2 ⁇ 450 present / mm 2 and more preferably [1] not [21] Absorbent article.
- the fiber density was calculated by magnifying (150 to 500 times) the cut surface of the nonwoven fabric portion using a microscope and counting the number of cross sections of the fibers cut by the cut surface per 1 mm 2 .
- the absorbent article according to any one of [1] to [24], wherein the thickness of the topsheet is preferably 2 mm to 6 mm, and more preferably 3 mm to 5 mm.
- Example 1 Manufacture of three-dimensional sheet
- the melting point Mp of polyethylene as the sheath component was 132 ° C. This web was supplied to the web shaping apparatus 5 shown in FIG.
- wind (temperature T 1 : 100 ° C., wind speed 55 m / sec) is blown onto the fiber web, and the fiber web is pedestal 53 (MD direction pitch 10 mm) having a large number of protrusions and air permeability. , CD direction pitch 5 mm).
- hot air (temperature T 2 : 160 ° C., wind speed 40 m / sec) is blown onto the fiber web on the pedestal 53 to shape the fiber web along the protrusions on the pedestal, and the fibers of each core-sheath structure was fused. In this way, a nonwoven fabric 10 'shaped by heat fusion was obtained.
- FIG. 10 shows a drawing-substituting photograph in which a cross section of the nonwoven fabric 10 ′ is imaged 20 times with a Keyence digital microscope VHX-1000.
- FIG. 11 shows 3.5 ⁇ 10 3 It is the shape of the nonwoven fabric 10 'cross section when pressed by Pa.
- photographed this nonwoven fabric 10 'from the skin opposing surface side was shown in FIG.
- the upper side is the protrusion 11 side
- the lower side is the concave bottom 21 side.
- the nonwoven fabric 10 ′ was manufactured with the MD direction oriented in the X direction shown in FIG. (2) Coating of skin care agent As shown in Fig.
- the skin care agent was spray-coated on the manufactured nonwoven fabric 10 'from the side having the protrusions 11 under the following conditions.
- Composition of skin care agent Equivalent mixture of diamide derivative represented by formula (I) and stearyl alcohol (St-OH) in a mass ratio of 5: 5
- the diamide derivative represented by formula (I) is as follows: A diamide derivative represented by the formula (II) was used.
- Basis weight of skin care agent 0.5 g / m 2 Distance from nonwoven fabric 10 'to spray gun: 50mm Gun air pressure: 0.3 MPa Processing speed (conveying speed of nonwoven fabric 10 '): 50 m / min
- reference numeral 82 denotes a mount (thin paper having a basis weight of 16 g / m 2 ). Thereafter, the top sheet 10 was taken out and stored in an environment of 23 ° C. and 50% RH with being sandwiched between release papers. Said 5 kPa is the pressure which assumed the general commercial state of the diaper which accumulated many diapers and compressed them and stored in the packaging bag.
- the surface sheet of the sample was cut with scissors to obtain a measuring piece of 1 to 2 mm square. Specifically, the 1st measurement piece was obtained from the top part 12a of the protrusion part 11 of each surface sheet. A second measurement piece was obtained from the bottom 21. Further, a third measurement piece was obtained from the side wall 3. Moreover, the 4th measurement piece was obtained similarly from the top part 12a of the protrusion part 11 of the sample immediately after application
- FT-IR infrared spectroscopy
- scanning was performed by irradiating infrared light from the skin facing surface side (upper side in FIG. 3) of each measurement piece.
- scanning was performed by irradiating infrared light from the non-skin facing surface side (the lower side in FIG. 3) for each of the measurement pieces.
- the test piece of the same area was used for the measurement of the site
- the skin care agent is attached to both the skin facing surface and the non-skin facing surface at the top of the protruding portion, and the top is non-skin It can be seen that a relatively large amount of skin care agent is present on the skin facing surface rather than the facing surface. Further, it can also be seen that the skin care agent is also attached to the skin facing surface in the side wall portion, and there is a relatively large amount of skin care agent in the top skin facing surface rather than the skin facing surface of the side wall portion. .
- the result of measuring the application state of the skin care agent on the skin facing surface 12a side of the top 12 from the sample immediately after applying the skin care agent, and a sample applied with the skin care agent separately from this result Compared to the result of measuring the application state of the skin care agent on the skin facing surface 12a side of the top 12 after storing under pressure at 40 ° C. and 80% RH for 3 days under a diaper pack pressure (about 5 kPa). Although the difference is seen because of the part of the surface sheet, it shows almost the same amount of skin care agent (peak area ratio S1 / S2), and the skin care agent is stably on the skin facing surface of the top portion 12. It can be seen that it exists on the 12a side.
- the amount of the skin care agent was measured by infrared spectroscopy (FT-IR).
- FT-IR infrared spectroscopy
- any one (1400-1500 cm ⁇ 1 which is a CH absorption peak derived from the surface sheet when a diamide derivative is applied to the PET / PE surface sheet)
- the ratio of the absorption peak of the amide group derived from the skin care agent can be determined.
- Measuring device Perkin Elmer Spectrum One Wave number resolution: 4cm -1 Integration count: 16 times
- Example 2 and Reference Example 1 The contact angle of the surface sheet immediately after application of the skin care agent obtained as described above was measured by the method described above. Further, skin care agents having a stearyl alcohol / diamide derivative mass ratio of 8/2 and 9/1 were prepared and applied to the surface sheet in the same manner as described above (Example 2). And the contact angle was similarly measured about the surface sheet after application
- the absorbent article of the present invention may be a pants-type disposable diaper, or an absorbent article other than a disposable diaper, for example, a sanitary napkin, a panty liner (origami sheet), an incontinence pad, a hygiene pad, or a nursing pad Etc.
- a sanitary napkin for example, a sanitary napkin, a panty liner (origami sheet), an incontinence pad, a hygiene pad, or a nursing pad Etc.
- the absorbent article of the present invention can stably hold a skin care agent at a site that is easily transferred to the skin, and is excellent in skin care effect and its sustainability.
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Abstract
Description
例えば、特許文献1には、表面シートに、エモリエント剤と固定化剤を含むローション組成物を、非均一パターンで適用した吸収性物品が記載されている。また、特許文献2には、複数の細片から成るパターンの形状で液体透過性トップシートにローションが付けられ、前記細片はローションが付けられていない複数の領域によって隔てられ、複数の細片から成るパターンは不連続的なパターンである、使い捨て吸収性物品が記載されている。
しかし、表面シートの肌に当接する部位にスキンケア剤を多量に存在させてスキンケア効果を高めることと、当該部位にその多量のスキンケア剤を安定に保持させることとを両立させることは困難であった。
図1は、本発明の第1実施形態である使い捨ておむつ1を一部破断して示す平面図である。第1実施形態の使い捨ておむつ1(以下、単におむつ1ともいう)は、図1に示すように、液透過性の表面シート10、液不透過性又は撥水性の裏面シート30及びこれら両シート間に配置された液保持性の吸収体40を備えている。
また、おむつ1は、その長手方向に、着用時に着用者の背中側に配される背側部A、股間部に配される股下部B及び腹側に配される腹側部Cを有している。
おむつ1の長手方向の両側それぞれには、撥水性不織布からなるサイドシート70が、表面シート10の両側部を覆うように配されている。表面シート10及び各サイドシート70は、吸収体40の周縁よりも外方の位置において、裏面シート30に接合されている。吸収体40の側縁よりも外方に位置するレッグフラップ部には、レッグギャザー形成用の弾性部材71が配されている。上述したサイドシート70のおむつ幅方向中央側の側縁には、立体ギャザー形成用の弾性部材72が配されている。
そして、図3に示すように、突出部11は、頂部12における肌対向面12a及び非肌対向面12bの両面にスキンケア剤13が付着しており、頂部12の非肌対向面12bよりも頂部12の肌対向面12aの方が、単位面積当たりのスキンケア剤量が多い。
隣り合う突出部列L11においては、突出部11の位置が、X方向に、突出部11間のピッチPx(図4参照)の半ピッチ分ずれている。
表面シート10には、4つの角部のそれぞれに突出部11の中心が位置する平面視略菱形形状(図6に図示した例は略正方形状)の多数の菱形領域R11(図6参照)が形成されている。そして、その菱形領域R11の中央部が、突出部11に対して相対的に窪んだ凹状の底部21となっている。
図3及び図4に示すように、突出部11の頂部12と凹状の底部21との間には、側壁部3が介在しており、頂部12、側壁部3及び底部21は、X方向及びY方向の断面において連続波状に連続している。他方、図5及び図6に示すように、X方向及びY方向のそれぞれと交差するM1方向及びM2方向においては、突出部11の頂部12どうしの間が、尾根部16を介して繋がっており、M1及びM2方向の断面においては、一の突出部11の頂部12と、尾根部16と、他の突出部11の頂部12とが連続波状に連続している。
頂部12における肌対向面12aのスキンケア剤量に対して頂部12の非肌対向面12bのスキンケア剤量がかなり少なくなること、及び頂部12の肌対向面12aにおける単位面積当たりのスキンケア剤量に対する、側壁部3の肌対向面3aにおける単位面積当たりのスキンケア剤量の関係から考察すると、側壁部3の非肌対向面3bには、スキンケア剤13が実質的に付着していないか、又は側壁部3の肌対向面3aに比して顕著に少ない量しかスキンケア剤13が付着していないことが推察される。他方、側壁部3の肌対向面3aにおけるスキンケア剤13の付着量は、頂部12の非肌対向面12bにおけるスキンケア剤13の付着量よりも多い。
頂部12は、表面シート10の平面視における突出部11の中央部から試験片を得て、後述する実施例で説明するスキンケア剤量の測定を行う。同様に、底部21におけるスキンケア剤量の測定は、表面シートの平面視における底部21の中央部から試験片を得て行う。側壁部3におけるスキンケア剤量の測定は、中央領域P2(好ましくは頂部21と底部21の中間部分)から試験片を得て行う。
なお、本実施形態の表面シート10の底部21の非肌対向面21bには、スキンケア剤13が実質的に付着していないか、又は側壁部3の肌対向面3aに比して顕著に少ない量しかスキンケア剤が付着していない。
KES圧縮試験機(カトーテック(株)製KES FB-3)を用い、表面シートについて、通常モードで5.0×103Paまでの圧縮特性評価を行い、無加圧時の厚み(T)と3.5×103Pa加圧時の厚み(Tp)をチャートから読み取った。
前記他のスキンケア剤の具体例としては、流動パラフィン、シリコーンオイル、動植物油(オリーブ油、ホオバ油、ベニバナ油、スクワラン及びスクワレン等)、モノグリセライド、ジグリセライド、トリグリセライド、脂肪族エーテル(ミリスチル-1,3-ジメチルブチルエーテル、パルミチル-1,3-ジメチルブチルエーテル、ステアリル-1,3-ジメチルブチルエーテル、パルミチル-1,3-メチルプロピルエーテル、ステアリル-1,3-メチルプロピルエーテル等)、イソステアリル-コレステロールエステル、パラフィンワックス、C12~C22脂肪酸、C12~C44脂肪酸エーテル、C12~C22脂肪アルコール、ワセリン、脂肪酸ソルビタンエステル(モノエステル、ジエステル、及びトリエステルのいずれでもよい。)、ポリオキシエチレン脂肪酸ソルビタンエステル(モノエステル、ジエステル、及びトリエステルのいずれでもよい。)、金属石験(ステアリン酸マグネシウム等)、ショ糖脂肪酸エステル、シクロデキストリン脂肪酸エステル、シリコーン、シリコーン系レジン、特許文献1又は特許文献2に記載されている発明で使用されるエモリエント剤やエモリエント剤と固定化剤を含むローション組成物等が挙げられる。
前記各種のスキンケア剤は、1種を単独で使用しても良いし、2種以上を併用しても良い。
しかも、頂部12の非肌対向面12bにもスキンケア剤13が存在することにより、突出部11が肌に押圧されたときにも、肌対向面12a側のスキンケア剤が非対向面側12bに移動しにくい。そのため、頂部12の肌当接面12aにスキンケア剤が安定的に保持され、スキンケア効果の持続性等にも優れている。
また、頂部12の非肌対向面12bに存在するスキンケア剤13の量が、肌対向面12aに比して少量であるため、表面シート10に残されるスキンケア剤13を少なくすることができ、表面シート10全体として少量のスキンケア剤13を塗布しておくことで有効量を効率的に肌へ移行させることができる。
しかも、側壁部3におけるスキンケア剤量が、頂部12の肌対向面12aに比して少量であるため、スキンケア剤13が油性であったり、親水性を低下させ易いものであったり、又は液の透過性を低下させ易いものであったりする場合にも、側壁部3が比較的良好な液透過性を維持する。そのため、排泄後にすばやく液を吸収し、液漏れを防止することができる。
また、肌対向面と非肌対向面とで、構成繊維の繊度を異ならせることも好ましい。例えば、一台のカード機で、繊維径の細い繊維からなる第1繊維ウェブを形成した後、その上に、他のカード機で製造した繊維径が太い繊維からなる第2繊維ウェブを合流させ、得られた積層ウェブを、後述するウェブ賦形装置5に第1繊維ウェブ側を台座53側に向けて導入することにより、非肌対向面よりも肌対向面の方が構成繊維の繊度が小さい表面シートが得られる。
非肌対向面よりも肌対向面の方が構成繊維の繊度(繊維径)が小さいことで、柔軟な面にスキンケア剤を保持でき、肌にやさしくフィットさせて、スキンケア剤を肌に移行させやすくすることができる。
好ましい製造方法の一例を示すと、図7に示すように、カード機51により所定の厚みとなるように形成した繊維ウェブ10Aを、多数の突起52を有し通気性を有する台座53を備えたウェブ賦形装置5に供給する。ウェブ賦形装置5においては、台座53上に供給した繊維ウェブ10Aに対して風54を吹き付けて、該繊維ウェブ10Aを、突起52を有する台座53の表面形状に概ね沿った形状に変形させる。風54の温度T1は、繊維ウェブを構成する熱可塑性繊維、例えば芯鞘型複合繊維の鞘成分である低融点成分の融点Mpよりも50℃低い温度以上で、かつこの融点よりも10℃高い温度以下に設定することができる(すなわち、Mp-50~Mp+10)。次いで、その台座53上の繊維ウェブ10Aに、熱風55を吹き付け、繊維ウェブを、より突起52に沿った形状に変形させると共に繊維の交点を熱融着させて、立体形状に賦形する。この熱風55の温度T2は、風54の温度T1よりも高いことを条件として、繊維ウェブを構成する熱可塑性繊維、例えば芯鞘型複合繊維の鞘成分である低融点成分の融点Mpに対して0~70℃高いことが好ましく、5~50℃高いことがより好ましい。
繊維ウェブを賦形する際の熱風の風速は、賦形性と風合いの観点から20~130m/秒とすることがより好ましく、より好ましくは30~100m/秒である。風速がこの下限値以上であれば立体感が十分となり、クッション性と排泄物の捕集性の効果が十分に発揮され好ましい。風速がこの上限値以下であれば繊維ウェブが開孔せず、耐圧縮性が良好に維持されるため、クッション性と排泄物の捕集性の効果が十分に発揮でき好ましい。
なお、図7に示す例においては、連続生産を考慮し、台座53をコンベア式のものとし、また、立体形状を賦形された不織布10’を、ロール57で巻き取っている。
繊維密度は、1mm2当たりの繊維本数を計測することで評価した。つまり、1mm2当たりの繊維本数が多いほど繊維密度は高いことになる。
突出部の頂部における繊維密度は前記理由から、30本/mm2~130本/mm2が好ましく、50本/mm2~100本/mm2がより好ましい。底部21における繊維密度は前記理由から、250本/mm2~500本/mm2が好ましく、300本/mm2~450本/mm2がより好ましい。また、突出部における繊維密度と底部21における繊維密度の差は、150本/mm2以上であることが好ましい。
<繊維密度の測定>
不織布部分の切断面を、顕微鏡を用いて拡大観察(150~500倍)し、1mm2当たりの前記切断面によって切断されている繊維の断面の数を数え、これを繊維密度とした。
顕微鏡;日本電子(株)社製のJCM-5100(商品名)
具体的には、例えば、図8(a)に示すように、不織布10’を、通気性のコンベア56上に、直接又は吸収体連続体等の通気性部材40Aを介在させて導入し、該コンベア5で不織布10’を搬送しつつ、該不織布10’に対し、突出部11が突出する面側から、加熱や溶液として流動性を高めたスキンケア剤13をスプレーする方法がある。
この方法によれば、図8(b)に示すように、スキンケア剤13を含む空気6が、繊維密度が低い突出部11の頂部12を貫通して大量に流れる一方、繊維密度が高い底部21には、スキンケア剤13を含む空気6が殆ど流れない。繊維密度が中間の側壁部3には、スキンケア剤13を含む空気6が、頂部12に比して少量流れる。
これにより、頂部12の肌対向面12aには、多量のスキンケア剤が付着すると共に、頂部12を貫通して頂部12の非肌対向面12bにも少量のスキンケア剤が付着する。また、側壁部3にも、頂部12の肌対向面12aに比して少量のスキンケア剤が付着する。このようにして、前述した表面シート10が得られる。
<繊維融着点数の測定>
不織布部分の切断面を、顕微鏡を用いて拡大観察(50~150倍)し、1mm2当たりの繊維の融着点数を数えることで導いた。
・顕微鏡;日本電子(株)社製のJCM-5100(商品名)
例えば、スキンケア剤の塗工方法は、前記のもの以外の多様な方法を選択することができる。例えば、塗工方式としては、ダイスコーター方式、スロットスプレー方式、カーテンスプレー方式、メルトブローン方式、スパイラルスプレー方式、グラビア方式、ビード方式等が挙げられる。
また、表面シートの基材となる立体形状に賦形された不織布の肌対向面と非肌対向面とに、それぞれの側から同時に又は順次、スキンケア剤を塗工することもできる。
また、表面シートは、スキンケア剤を保持した突出部が全域に分布しているものに限られず、図2中のX方向及び/又はY方向の一部のみに突出部が分布しているものであっても良い。例えば、図9に示すおむつの表面シート10における斜線部の範囲のみに突出部が分布していても良いし、表面シート10の全面に突出部が分布しているが、そのうちの斜線部の範囲内の突出部のみにスキンケア剤が保持されていても良い。
〔1〕
不織布からなる液透過性の表面シート、液不透過性又は撥水性の裏面シート及びこれら両シート間に配置された吸収体を備えた吸収性物品であって、
前記表面シートは、着用者の肌側に向かって突出する多数の突出部を有し、前記突出部は、前記吸収体側が開放された内部空間を有しており、
前記突出部は、頂部における肌対向面及び非肌対向面の両面にスキンケア剤が付着しており、該頂部における非肌対向面よりも肌対向面の方が、単位面積当たりのスキンケア剤量が多い、吸収性物品。
〔2〕
前記突出部は、側壁部における肌対向面にもスキンケア剤が付着しており、前記頂部の肌対向面よりも該側壁部の肌対向面の方が、単位面積当たりのスキンケア剤量が少ない、〔1〕記載の吸収性物品。
〔3〕
前記表面シートの非肌対向面よりも該表面シートの肌対向面の方が、構成繊維の繊度が小さい、〔1〕又は〔2〕記載の吸収性物品。
前記突出部は、前記表面シートの面内における一方向X及びそれと直交するY方向の断面が何れも肌側に向けて凸の円弧状をなす凸曲面状の頂部を有しており、
前記表面シートは、前記突出部に対して相対的に窪んだ凹状の底部を更に有し、該底部は、X方向及びY方向の断面が何れも肌側に向けて凹の凹曲面状をなしている〔1〕ないし〔3〕のいずれか一項に記載の吸収性物品。
〔5〕
前記突出部は、前記表面シートの面内における一方向Xに直列した突出部列を形成し、該突出部列が、X方向と直交するY方向に複数列形成されており、
隣り合う前記突出部列においては、前記突出部の位置が、X方向に、前記突出部間のピッチの半ピッチ分ずれている〔1〕ないし〔4〕のいずれか一項に記載の吸収性物品。
〔6〕
前記表面シートは、前記側壁部の肌対向面におけるスキンケア剤の付着量が、前記頂部の非肌対向面におけるスキンケア剤の付着量よりも多い〔1〕ないし〔5〕のいずれか一項に記載の吸収性物品。
〔7〕
前記底部の肌対向面に、前記側壁部の肌対向面と同程度の量のスキンケア剤が保持されている〔4〕ないし〔6〕のいずれか一項に記載の吸収性物品。
前記突出部は、側壁部における非肌対向面にスキンケア剤が付着していない〔1〕ないし〔7〕のいずれか一項に記載の吸収性物品。
〔9〕
前記表面シートは、前記突出部に対して相対的に窪んだ凹状の底部を更に有し、該底部21の非肌対向面にはスキンケア剤が付着していない〔1〕ないし〔8〕のいずれか一項に記載の吸収性物品。
〔10〕
前記表面シートは、前記突出部における繊維融着点数n1が、前記底部における繊維融着点数n2よりも少ない〔4〕ないし〔9〕のいずれか一項に記載の吸収性物品。
〔11〕
前記繊維融着点数n1が30個/mm2~130個/mm2である〔10〕に記載の吸収性物品。
前記繊維融着点数n2が250個/mm2~500個/mm2である〔10〕又は〔11〕に記載の吸収性物品。
〔13〕
前記スキンケア剤が施された前記表面シートとイオン交換水との接触角が55度以上90度以下である〔1〕ないし〔12〕のいずれか一項に記載の吸収性物品。
〔14〕
前記表面シートに親水化処理が施されている〔1〕ないし〔13〕のいずれか一項に記載の吸収性物品。
〔15〕
前記表面シートを構成する前記不織布は、その全体が、繊度が等しい単一種類の繊維からなる〔1〕ないし〔14〕のいずれか一項に記載の吸収性物品。
〔16〕
前記表面シートを構成する前記不織布は、繊度が異なる複数種類の繊維からなる〔1〕ないし〔14〕のいずれか一項に記載の吸収性物品。
〔17〕
前記表面シートを構成する前記不織布は、肌対向面と非肌対向面とで、構成繊維の繊度が異なっている〔1〕ないし〔16〕のいずれか一項に記載の吸収性物品。
前記表面シートを構成する前記不織布は、非肌対向面よりも肌対向面の方が、構成繊維の繊度が小さい〔17〕記載の吸収性物品。
〔19〕
前記表面シートを構成する前記不織布は、熱可塑性繊維を30~100質量%含んでいる〔1〕ないし〔18〕のいずれか一項に記載の吸収性物品。
〔20〕
前記熱可塑性繊維として、低融点成分及び高融点成分を含む複合繊維を用いる〔19〕記載の吸収性物品。
〔21〕
前記突出部の前記頂部における繊維密度は、30本/mm2~130本/mm2が好ましく、50本/mm2~100本/mm2がより好ましい〔1〕ないし〔20〕のいずれか一項に記載の吸収性物品。
〔22〕
前記表面シートは、前記突出部に対して相対的に窪んだ凹状の底部を更に有し、
前記底部における繊維密度は、250本/mm2~500本/mm2が好ましく、300本/mm2~450本/mm2がより好ましい〔1〕ないし〔21〕のいずれか一項に記載の吸収性物品。
前記頂部における繊維密度と前記底部における繊維密度の差が、150本/mm2以上である〔22〕記載の吸収性物品。
〔24〕
前記繊維密度は、前記不織布部分の切断面を、顕微鏡を用いて拡大観察(150~500倍)し、1mm2当たりの前記切断面によって切断されている繊維の断面の数を数えて算出されたものである〔21〕ないし〔23〕のいずれか一項に記載の吸収性物品。
〔25〕
前記表面シートの厚さは、2mm~6mmであることが好ましく、3mm~5mmであることがより好ましい〔1〕ないし〔24〕のいずれか一項に記載の吸収性物品。
〔26〕
前記表面シートの坪量は、15~50g/m2であることが好ましく、20~40g/m2であることがより好ましい〔1〕ないし〔25〕のいずれか一項に記載の吸収性物品。
〔27〕
前記スキンケア剤として油性スキンケア剤を用いる〔1〕ないし〔26〕のいずれか一項に記載の吸収性物品。
前記スキンケア剤が、下記式(I)で表されるジアミド誘導体を含むものである〔1〕ないし〔27〕のいずれか一項に記載の吸収性物品。
前記式(I)で表されるジアミド誘導体として、下記式(II)で表されるジアミド誘導体を用いた〔28〕記載の吸収性物品。
前記スキンケア剤が、C12~C22脂肪アルコールと、上式(I)のジアミド誘導体との混合物を含むものである〔28〕又は〔29〕記載の吸収性物品。
前記C12~C22脂肪アルコールがステアリルアルコールである〔30〕記載の吸収性物品。
〔32〕
前記式(I)のジアミド誘導体及びステアリルアルコールを含み、ステアリルアルコール/ジアミド誘導体の質量比が、90/10~50/50である〔28〕ないし〔32〕のいずれか一項に記載の吸収性物品。
〔33〕
使い捨ておむつである〔1〕ないし〔32〕のいずれか一項に記載の吸収性物品。
〔34〕
展開型の使い捨ておむつである〔33〕記載の吸収性物品。
(立体シートの製造)
(1)不織布の作製
芯がポリエチレンテレフタレートで鞘がポリエチレンからなる2.4dtex×51mmの芯鞘型複合繊維を用い、坪量が27g/m2であるウェブをカード機によって製造した。鞘成分であるポリエチレンの融点Mpは132℃であった。このウェブを図7に示すウェブ賦形装置5に供給した。ウェブ賦形装置5では、前記繊維ウェブに風(温度T1:100℃、風速55m/秒)を吹き付けて該繊維ウエブを、多数の突起を有し通気性を有する台座53(MD方向ピッチ10mm、CD方向ピッチ5mm)の上に定着させた。次いで、その台座53上の繊維ウェブに熱風(温度T2:160℃、風速40m/秒)を吹き付けて、前記台座上の突起に沿って繊維ウェブを賦形すると共に、各芯鞘構造の繊維を融着させた。このように熱融着して賦形した不織布10’を得た。
不織布10’の断面をキーエンス製デジタルマイクロスコープVHX-1000により20倍で撮像した図面代用写真を図10に載せる。図11に示したのは、3.5×103
Paで押圧したときの不織布10’断面の形状である。またこの不織布10’を、肌対向面側から撮影した写真を図12に示した。図10の写真中、上方が突出部11側であり、下方が凹状の底部21側である。なお、本実施例においては、MD方向を、図2に示したXの方向に向けて不織布10’を製造した。
(2)スキンケア剤の塗工
製造した不織布10’に、図8(a)に示すようにして、下記の条件でスキンケア剤を、突出部11を有する側からスプレー塗工した。
スキンケア剤の組成:前記式(I)で表されるジアミド誘導体とステアリルアルコール(St-OH)との質量比5:5の等量混合物
前記式(I)で表されるジアミド誘導体としては、下式(II)で表されるジアミド誘導体を用いた。
不織布10’からスプレーガンまでの距離:50mm
ガンエア圧:0.3MPa
加工速度(不織布10’の搬送速度):50m/min
(塗布直後サンプル)
スキンケア剤塗工後の表面シートを、巻き取ることなく剥離紙間に挟んだ状態で、23℃、50%RHの環境下に保存した。
(加圧保存後サンプル)
製品としてパック保存された状態(圧縮して包装袋に充填した市販状態)を想定し、スキンケア剤塗工後の表面シート10を、図13に示すように、剥離紙81,81間に挟み、約5kPaの加圧下に3日間、40℃、80%RHの環境下に保存した。図13中、82は、台紙(坪量16g/m2 の薄紙)である。その後、表面シート10を取り出し、剥離紙間に挟んだ状態で23℃、50%RHの環境下に保存した。前記の5kPaは、多数のおむつを集積し、それらを圧縮して包装袋に収容したおむつの一般的な市販状態を想定した圧力である。
加圧保存後サンプルの表面シートをはさみで切断し、1~2mm角の測定片を得た。具体的には、各表面シートの突出部11の頂部12aから第1測定片を得た。底部21から第2測定片を得た。更に、側壁部3から第3測定片を得た。また、塗布直後サンプルの突出部11の頂部12aから同様にして第4測定片を得た。
そして、後述する方法〔赤外分光法(FT-IR)を用いる方法〕により、第1~第4測定片のそれぞれについて、表面シート由来のC-H吸収ピーク(1400-1500cm-1)の面積S2に対する、スキンケア剤由来のアミド基の吸収ピーク(1600-1670cm-1)の面積S1の比(S1/S2,図14参照)を求めた。
各部の肌対向面の量を測定する場合は、スキャンを、測定片のそれぞれについて、肌対向面側(図3の上側)から赤外光を照射して行った。非肌対向面の量の測定する場合は、スキャンを、測定片のそれぞれについて、非肌対向面側(図3の下側)から赤外光を照射して行った。スキンケア剤量(単位面積当たり量)を対比すべき部位の測定には、同一面積の試験片を用いた。
スキンケア剤の量は、赤外分光法(FT-IR)により測定した。
FT-IRから得られる赤外吸収ピークの表面シート由来の吸収ピーク面積に対する、スキンケア剤由来の吸収ピーク面積の比の比較によって、スキンケア剤が多いところと少ないところの判断が可能である。すなわち、表面シート由来の吸収ピーク面積に対する、スキンケア剤由来の吸収ピーク面積の比が大きい場合には、該比が小さい場合よりも、存在するスキンケア剤が多いと判断できる。
赤外分光法にはATR法を用いることができる。そして、直接測定することで得られる吸収ピークのうち、任意のもの(PET/PE表面シートにジアミド誘導体を塗付した場合には、表面シート由来のC-H吸収ピークである1400-1500cm-1に対する、スキンケア剤由来のアミド基の吸収ピークである1600-1670cm-1)の比を比較することで、スキンケア剤の存在の多少を判断できる。
測定装置:パーキンエルマー社 Spectrum One
波数分解能:4cm-1
積算回数:16回
上述のようにして得られたスキンケア剤の塗布直後の表面シートについて、先に述べた方法で接触角を測定した。またステアリルアルコール/ジアミド誘導体の質量比が、8/2及び9/1のスキンケア剤を調製して、上述の方法と同様の方法で表面シートに塗布した(実施例2)。そして塗布後の表面シートについて、同様に接触角を測定した。更に、参考例1として、ステアリルアルコール/ワセリンの質量比が、5/5、8/2及び0/1のスキンケア剤を調製して、これを上述の方法と同様の方法で表面シート10に塗布した。そして塗布後の表面シートについて、同様に接触角を測定した。これらの結果を以下の表1に示す。
Claims (15)
- 不織布からなる液透過性の表面シート、液不透過性又は撥水性の裏面シート及びこれら両シート間に配置された吸収体を備えた吸収性物品であって、
前記表面シートは、着用者の肌側に向かって突出する多数の突出部を有し、前記突出部は、前記吸収体側が開放された内部空間を有しており、
前記突出部は、頂部における肌対向面及び非肌対向面の両面にスキンケア剤が付着しており、該頂部における非肌対向面よりも肌対向面の方が、単位面積当たりのスキンケア剤量が多い、吸収性物品。 - 前記突出部は、側壁部における肌対向面にもスキンケア剤が付着しており、前記頂部の肌対向面よりも該側壁部の肌対向面の方が、単位面積当たりのスキンケア剤量が少ない、請求項1記載の吸収性物品。
- 前記表面シートの非肌対向面よりも該表面シートの肌対向面の方が、構成繊維の繊度が小さい、請求項1又は2記載の吸収性物品。
- 前記突出部は、前記表面シートの面内における一方向X及びそれと直交するY方向の断面が何れも肌側に向けて凸の円弧状をなす凸曲面状の頂部を有しており、
前記表面シートは、前記突出部に対して相対的に窪んだ凹状の底部を更に有し、該底部は、X方向及びY方向の断面が何れも肌側に向けて凹の凹曲面状をなしている請求項1ないし3のいずれか一項に記載の吸収性物品。 - 前記突出部は、前記表面シートの面内における一方向Xに直列した突出部列を形成し、該突出部列が、X方向と直交するY方向に複数列形成されており、
隣り合う前記突出部列においては、前記突出部の位置が、X方向に、前記突出部間のピッチの半ピッチ分ずれている請求項1ないし4のいずれか一項に記載の吸収性物品。 - 前記表面シートは、前記側壁部の肌対向面におけるスキンケア剤の付着量が、前記頂部の非肌対向面におけるスキンケア剤の付着量よりも多い請求項1ないし5のいずれか一項に記載の吸収性物品。
- 前記底部の肌対向面に、前記側壁部の肌対向面と同程度の量のスキンケア剤が保持されている請求項4ないし6のいずれか一項に記載の吸収性物品。
- 前記表面シートは、前記突出部における繊維融着点数n1が、前記底部における繊維融着点数n2よりも少ない請求項4ないし7のいずれか一項に記載の吸収性物品。
- 前記繊維融着点数n1が30個/mm2~130個/mm2である請求項8に記載の吸収性物品。
- 前記繊維融着点数n2が250個/mm2~500個/mm2である請求項8又は9に記載の吸収性物品。
- 前記スキンケア剤が施された前記表面シートとイオン交換水との接触角が55度以上90度以下である請求項1ないし10のいずれか一項に記載の吸収性物品。
- 前記スキンケア剤が、C12~C22脂肪アルコールと、上式(I)のジアミド誘導体との混合物を含むものである請求項12に記載の吸収性物品。
- 使い捨ておむつである請求項1ないし13のいずれか一項に記載の吸収性物品。
- 展開型の使い捨ておむつである請求項14に記載の吸収性物品。
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JP7281399B2 (ja) | 2019-12-27 | 2023-05-25 | ユニ・チャーム株式会社 | 吸収性物品 |
JP7281398B2 (ja) | 2019-12-27 | 2023-05-25 | ユニ・チャーム株式会社 | 吸収性物品 |
JP7286533B2 (ja) | 2019-12-27 | 2023-06-05 | ユニ・チャーム株式会社 | 吸収性物品 |
Also Published As
Publication number | Publication date |
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CN104023684A (zh) | 2014-09-03 |
CN104023684B (zh) | 2016-01-20 |
RU2573950C1 (ru) | 2016-01-27 |
JP5909349B2 (ja) | 2016-04-26 |
JP2012143543A (ja) | 2012-08-02 |
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