CN108348364B - Absorbent article - Google Patents
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- CN108348364B CN108348364B CN201680062122.0A CN201680062122A CN108348364B CN 108348364 B CN108348364 B CN 108348364B CN 201680062122 A CN201680062122 A CN 201680062122A CN 108348364 B CN108348364 B CN 108348364B
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- styrene
- thermoplastic elastomer
- gel
- absorbent article
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- 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
- A61F13/45—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 shape
- A61F13/47—Sanitary towels, incontinence pads or napkins
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- Epidemiology (AREA)
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- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
An object of the present invention is to provide an absorbent article or a nonwoven fabric containing a gel-like composition on the surface thereof, the gel-like composition having an appropriate hardness and being capable of easily releasing an oil agent even under a light load, thereby preventing stickiness and exhibiting an excellent lubricating effect. The absorbent article or nonwoven fabric of the present invention contains a gel-like composition (6) on the surface, and the gel-like composition (6) contains 500 to 4800 parts by mass of a styrene-based thermoplastic elastomer mixture (A) per 100 parts by mass of the mixture, the kinematic viscosity of the mixture at 37.8 ℃ being 5 to 50mm2An aliphatic hydrocarbon oil (B) and 60 to 1000 parts by mass of a fatty acid triglyceride (C) having 8 to 22 carbon atoms which is liquid at 20 ℃, wherein the styrene-based thermoplastic elastomer mixture (A) contains: the thermoplastic elastomer composition comprises a low-molecular-weight styrene thermoplastic elastomer (A1) and a high-molecular-weight styrene thermoplastic elastomer (A2), wherein the mass ratio of the low-molecular-weight styrene thermoplastic elastomer (A1) to the high-molecular-weight styrene thermoplastic elastomer (A2) is (A1)/(A2) 95/5-50/50.
Description
Technical Field
The present invention relates to an absorbent article containing a gel-like composition that has an appropriate hardness on the skin-side surface, is not sticky, and can exhibit an excellent lubricating effect. The present invention also relates to a nonwoven fabric having the gel composition on the surface.
Background
In absorbent articles such as sanitary napkins, panty liners, and diapers, basic performances such as absorption performance have been improved by technological development accumulated over the years, and leakage and the like have been less likely to occur after absorption of excreta such as menstrual blood or urine as compared with the conventional ones.
For example, patent document 1 discloses an absorbent article including a skin care agent coating layer in an amount effective to be semi-solid or solid at 20 ℃ and to be partially movable toward the skin of a wearer, at least in a part of the outer surface of a topsheet. Further, according to patent document 1, the skin care agent coating layer is (i)10 to 95% of a substantially moisture-free lubricant having a plasticity or fluidity at 20 ℃ and containing one selected from a petroleum-based lubricant, a fatty acid ester lubricant, an alkyl ethoxy compound lubricant, and a mixture thereof, and (ii)5 to 90% of an immobilizing substance capable of immobilizing the lubricant on the outer surface of the surface sheet, the immobilizing substance having a melting point of at least 35 ℃, preferably at least 40 ℃, and being composed of a polyhydroxy fatty acid ester, a polyhydroxy fatty acid amide, and C12-C22Fatty alcohol, C12-C22Fatty acid, C14-C22Alcohol ethoxylates, and mixtures thereof.
The absorbent article disclosed in patent document 1 has an effect of increasing the viscosity of the skin care agent coating layer by crystallizing the immobilizing substance having a melting point of 35 ℃ or higher at room temperature (25 ℃) in the skin care agent coating layer, thereby preventing the skin care agent coating layer from moving, but when the skin care agent coating layer is made highly viscous, the active ingredient having a skin care effect is confined in the absorbent article, and particularly, when the load applied to the skin care agent coating layer is small, a sufficient amount of oil agent cannot be discharged, and a sufficient lubricating effect cannot be obtained. Further, since such a skin care agent coating layer having a high viscosity is relatively hard as a material to be applied to a topsheet of an absorbent article (i.e., a material directly contacting the skin), there is a possibility that the wearing feeling is also poor.
On the other hand, patent document 2 discloses a gel composition that exhibits delayed elasticity in relation to hardness, elongation, and the like of the gel. The composition disclosed in patent document 2 is a gel elastomer composed of a high-molecular-weight triblock styrene-based thermoplastic elastomer having a number average molecular weight of 13 ten thousand or more, a low-molecular-weight triblock styrene-based thermoplastic elastomer having a number average molecular weight of 10 ten thousand or less, and a softener, and the composition is imparted with delayed elasticity by absorbing and holding a large amount of the softener with the high-molecular-weight triblock styrene-based elastomer and by containing the low-molecular-weight triblock styrene-based elastomer.
Documents of the prior art
Patent document
Patent document 1: japanese Kohyo publication Hei 10-509896
Patent document 2: japanese laid-open patent application No. 2001-151980
Disclosure of Invention
Problems to be solved by the invention
Accordingly, an object of the present invention is to provide an absorbent article which contains a gel-like composition on the surface thereof, has appropriate hardness, and is capable of easily releasing an oil agent even under a light load, thereby exhibiting an excellent lubricating effect without causing stickiness. It is another object of the present invention to provide a nonwoven fabric containing a gel-like composition on the surface thereof, wherein the gel-like composition has an appropriate hardness, does not cause stickiness, and can exhibit an excellent lubricating effect.
An absorbent article according to one aspect (aspect 1) of the present invention is an absorbent article comprising a gel-like composition on a surface that contacts the skin surface of a wearer, wherein the gel-like composition comprises 500 to 4800 parts by mass of a styrene-based thermoplastic elastomer mixture (a) per 100 parts by mass of the mixture, and has a kinematic viscosity at 37.8 ℃ of 5 to 50mm2An aliphatic hydrocarbon oil (B) and 60 to 1000 parts by mass of a fatty acid triglyceride (C) having 8 to 22 carbon atoms which is liquid at 20 ℃, wherein the styrene-based thermoplastic elastomer mixture (A) contains: a styrene-based thermoplastic elastomer having a weight average molecular weight of 10 to 18 ten thousand and comprising a block copolymer having at least three blocksA body (A1); and a styrene-based thermoplastic elastomer (a2) having a weight-average molecular weight of 18 to 30 ten thousand and comprising a triblock or higher block copolymer, wherein the mass ratio of the styrene-based thermoplastic elastomer (a1) to the styrene-based thermoplastic elastomer (a2) is (a1)/(a2) ═ 95/5 to 50/50.
In the absorbent article of the aspect 1, the gel-like composition contained in the surface that contacts the skin surface of the wearer is formed with the above-described specific composition, and therefore, the gel-like composition has an appropriate hardness, and the oil agent is easily released even under a light load, whereby the gel-like composition does not cause stickiness and can exhibit an excellent lubricating effect. Accordingly, the absorbent article of the aspect 1 can obtain excellent wearing feeling and lubricating effect as an absorbent article.
In the absorbent article according to the other aspect (aspect 2) of the present invention, in the absorbent article according to the aspect 1, the block copolymer has two or more block components composed of styrene-based hard segments in the molecular chain.
In the absorbent article of embodiment 2, since the block copolymer contained in the gel composition has two or more block components composed of styrene-based hard segments in the molecular chain, a gel having more appropriate hardness can be easily obtained, and the oil agent release property is also good.
In the absorbent article according to still another aspect (aspect 3) of the present invention, in the absorbent article according to aspect 2, the block components at least two ends in the molecular chain of the block copolymer are block components composed of the styrene-based hard segments.
In the absorbent article of embodiment 3, since the block copolymer contained in the gel composition has the block components at least two ends in the molecular chain of the block copolymer composed of the styrene-based hard segments, a gel having an appropriate hardness can be more easily obtained, and the oil agent release property is more excellent.
In an absorbent article according to still another aspect (aspect 4) of the present invention, in the absorbent article according to any one of aspects 1 to 3, the aliphatic hydrocarbon oil (B) is hydrogenated polyisobutene.
In the absorbent article of embodiment 4, since the aliphatic hydrocarbon oil (B) contained in the gel-like composition is hydrogenated polyisobutene, stickiness due to the oil agent released from the gel is less likely to occur, and the lubricating effect can be more effectively exhibited.
An absorbent article according to still another aspect (aspect 5) of the present invention is the absorbent article according to any one of aspects 1 to 4, wherein the fatty acid triglyceride (C) includes a saturated fatty acid triglyceride (C1) having 8 to 12 carbon atoms and an unsaturated fatty acid triglyceride (C2) having 14 to 22 carbon atoms, and a mass ratio of the saturated fatty acid triglyceride (C1) to the unsaturated fatty acid triglyceride (C2) is (C1)/(C2) 95/5 to 50/50.
In the absorbent article of aspect 5, the fatty acid triglyceride (C) contained in the gel composition contains the saturated fatty acid triglyceride (C1) having 8 to 12 carbon atoms and the unsaturated fatty acid triglyceride (C2) having 14 to 22 carbon atoms at a predetermined mass ratio, and therefore, a gel having more appropriate hardness can be obtained and more excellent lubricating effect can be exhibited.
An absorbent article according to still another aspect (aspect 6) of the present invention is the absorbent article according to any one of aspects 1 to 5, wherein the absorbent article includes a liquid-permeable front sheet, a liquid-impermeable back sheet, and an absorber positioned between the front sheet and the back sheet, and the surface that contacts the skin surface of the wearer is a surface on the skin surface side of the front sheet.
In the absorbent article of aspect 6, the gel-like composition having the specific composition is included in the surface of the topsheet on the skin surface side, which is most likely to come into contact with the skin surface of the wearer, and therefore, the effect of the gel-like composition can be more reliably exhibited.
In the absorbent article according to still another aspect of the present invention (aspect 7), in the absorbent article according to aspect 6, the gel-like composition is disposed on the skin surface side of the topsheet in a stripe shape or a dot shape in a plan view.
In the absorbent article of aspect 7, the gel-like composition is arranged in a stripe or dot shape in a plan view, and the arrangement region of the gel-like composition having water repellency and the non-arrangement region of the gel-like composition are formed on the surface on the skin surface side of the top sheet, so that the liquid excrement such as urine supplied to the surface on the skin surface side of the top sheet can be easily taken into the inside of the top sheet through the non-arrangement region of the gel-like composition by the additive action of the repulsive action due to the water repellency in the arrangement region of the gel-like composition and the water absorbing action due to the hydrophilicity inside of the top sheet in the non-arrangement region of the gel-like composition. Accordingly, the absorbent article of embodiment 6 can obtain not only the effects related to the hardness and lubricating effect of the gel described above, but also excellent liquid permeability and liquid drainage as an absorbent article.
An absorbent article according to still another aspect (aspect 8) of the present invention is the absorbent article according to any one of aspects 1 to 7, wherein the absorbent article is a sanitary napkin, a panty liner, a diaper, or a urine-separation pad.
The absorbent article of the aspect 8 is a sanitary napkin, a pantiliner, a diaper, or a urine-proof pad, and is applied to a skin surface of a site particularly sensitive to irritation, and therefore, the effect of the gel composition can be enjoyed more comfortably.
Still another aspect (aspect 9) of the present invention is a nonwoven fabric having a gel-like composition in a surface thereof, wherein the gel-like composition contains 500 to 4800 parts by mass of a styrene-based thermoplastic elastomer mixture (A) having a kinematic viscosity at 37.8 ℃ of 5 to 50mm per 100 parts by mass of the mixture2An aliphatic hydrocarbon oil (B) and 60 to 1000 parts by mass of a fatty acid triglyceride (C) having 8 to 22 carbon atoms which is liquid at 20 ℃, wherein the styrene-based thermoplastic elastomer mixture (A) contains: a styrenic thermoplastic elastomer comprising a block copolymer having a weight average molecular weight of 10 to 18 ten thousand and containing three or more blocksA body (A1); and a styrene-based thermoplastic elastomer (a2) having a weight-average molecular weight of 18 to 30 ten thousand and comprising a triblock or higher block copolymer, wherein the mass ratio of the styrene-based thermoplastic elastomer (a1) to the styrene-based thermoplastic elastomer (a2) is (a1)/(a2) ═ 95/5 to 50/50.
The nonwoven fabric of embodiment 9 has a suitable hardness because the gel-like composition contained in the surface is composed of the above-described specific composition, and is capable of exhibiting an excellent lubricating effect without causing stickiness by easily releasing an oil agent even under a light load. Thus, the nonwoven fabric of the mode 8 can provide comfortable feeling in use, feeling in wear, and a lubricating effect to the nonwoven fabric or an article using the nonwoven fabric.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, there can be provided an absorbent article having a gel-like composition on the surface thereof, which has appropriate hardness and is capable of exhibiting an excellent lubricating effect without causing stickiness by easily releasing an oil agent even under a light load, and a nonwoven fabric having the gel-like composition on the surface thereof.
Drawings
Fig. 1 is a plan view showing a sanitary napkin 1 according to an embodiment of the present invention.
Fig. 2 is a plan view showing a sanitary napkin 1' according to another embodiment of the present invention.
Detailed Description
Hereinafter, preferred embodiments of the absorbent article of the present invention will be described in detail with reference to the drawings. In the present specification, unless otherwise specified, "an object (for example, an absorbent article, a nonwoven fabric, or the like) placed on a horizontal plane in a state of being spread out in a thickness direction of the object as viewed from above in a vertical direction" is simply referred to as "a top view".
The various directions and the like used in the present specification are as follows unless otherwise specified.
In the present specification, "the width direction W" refers to a direction in which the length of an object that is longitudinally long in a plan view is short (short-side direction), "the length direction L refers to a direction in which the length of an object that is longitudinally long in a plan view is long," the thickness direction "refers to a direction perpendicular to an object placed on a horizontal plane in a developed state," and these width direction W, length direction L, and thickness direction have a relationship orthogonal to each other. In the present specification, the "relatively close side with respect to the width direction central axis line extending in the longitudinal direction L in the width direction W of an object (for example, an absorbent article, a nonwoven fabric, or the like) that is long in the longitudinal direction" is referred to as "inner side in the width direction", and the "relatively far side with respect to the width direction central axis line in the width direction W of the object that is long in the longitudinal direction" is referred to as "outer side in the width direction".
In the present specification, unless otherwise specified, in the thickness direction of the absorbent article, "the side located relatively close to the skin surface of the wearer when the absorbent article is worn" is referred to as "skin surface side", and "the side located relatively far from the skin surface of the wearer when the absorbent article is worn" is referred to as "non-skin surface side".
Fig. 1 is a plan view showing a sanitary napkin 1 (absorbent article) according to an embodiment of the present invention. As shown in fig. 1, the sanitary napkin 1 according to the present embodiment has an overall external shape in a longitudinal direction long in the longitudinal direction L in a plan view, and further has a shape in which the outer edge of the central portion in the longitudinal direction L protrudes in a substantially trapezoidal shape outward in the width direction W. Further, as shown in fig. 1, the sanitary napkin 1 includes a side sheet 4 extending in the longitudinal direction L at each of both ends in the width direction, and an embossed portion 5 extending in the longitudinal direction L at each of both ends in the width direction along an outer edge thereof.
The sanitary napkin 1 is provided with a liquid-permeable top sheet 2 positioned on the skin surface side, a liquid-impermeable back sheet (not shown) positioned on the non-skin surface side, and an absorbent body 3 positioned between these sheets in the thickness direction, and the top sheet 2 includes a plurality of stripe-shaped gel-like compositions 6 extending in the longitudinal direction L on the skin surface side.
Next, the gel composition used for the absorbent article of the present invention will be described in more detail.
[ gel composition ]
In the present invention, the gel composition contains 500 to 4800 parts by mass of a styrene thermoplastic elastomer mixture (A) having a molecular weight dispersity (Mw/Mn) of 1.25 to 1.60 and a kinematic viscosity at 37.8 ℃ of 5 to 50mm2An aliphatic hydrocarbon oil (B) and 60 to 1000 parts by mass of a fatty acid triglyceride (C) having 8 to 22 carbon atoms which is liquid at 20 ℃, wherein the styrene thermoplastic elastomer mixture (A) contains: a styrene-based thermoplastic elastomer (a1) having a weight-average molecular weight of 10 to less than 18 ten thousand and comprising a triblock or higher block copolymer, and a styrene-based thermoplastic elastomer (a2) having a weight-average molecular weight of 18 to less than 30 ten thousand and comprising a triblock or higher block copolymer, wherein the mass ratio of the styrene-based thermoplastic elastomer (a1) to the styrene-based thermoplastic elastomer (a2) is (a1)/(a2) 95/5 to 50/50. Since the gel-like composition having such a specific composition has an appropriate hardness and is capable of exhibiting an excellent lubricating effect without causing stickiness by easily releasing an oil agent even under a light load, when the gel-like composition is contained in a surface that is in contact with the skin surface of a wearer of an absorbent article, excellent wearing feeling and an excellent lubricating effect can be obtained as the absorbent article.
The styrene-based thermoplastic elastomers (a1, a2) used in the gel-like composition are block copolymers containing three or more blocks of a styrene-based hard segment and a soft segment, and further, from the viewpoint of easily obtaining a gel of appropriate hardness and from the viewpoint of improving the release of an oil agent, block copolymers having two or more block components composed of a styrene-based hard segment in the molecular chain are preferable, and block components at least at two ends in the molecular chain are more preferable as block components composed of the styrene-based hard segment. The styrene-based hard segment is not particularly limited, and examples thereof include: styrenic polymers such as polystyrene, poly (. alpha. -methylstyrene), poly (o-methylstyrene), poly (m-methylstyrene), and poly (p-methylstyrene). The soft segment is not particularly limited, and examples thereof include: olefin polymers such as polyethylene, polypropylene, polybutene, polybutadiene, and polyisoprene. In the present specification, a block component composed of a styrene-based hard segment is sometimes referred to as a "styrene-based block component", and a block component composed of an olefin-based soft segment is sometimes referred to as an "olefin-based block component".
The copolymer used for the styrene-based thermoplastic elastomer (a1, a2) is not particularly limited as long as it is a copolymer obtained by copolymerizing styrene-based blocks having at least three blocks, and examples thereof include: styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butylene-styrene block copolymer (SEBS), styrene-isoprene-butylene-styrene block copolymer (SIBS), styrene-isoprene-styrene block copolymer (SIS), styrene-ethylene-propylene-styrene copolymer (SEPS), styrene-ethylene-propylene-styrene block copolymer (SEEPS), and combinations of two or more of these copolymers. Among them, from the viewpoint of the hardness and elongation of the gel after application to the surface sheet, etc., a styrene-ethylene-butylene-styrene block copolymer (SEBS), a styrene-ethylene-propylene-styrene block copolymer (SEPS), a styrene-ethylene-propylene-styrene block copolymer (SEEPS), or a combination of two or more of them is preferable. When a diblock copolymer is used as the styrene-based thermoplastic elastomer (a1, a2), the interaction of the styrene-based hard segments (pi-pi stacking) is weakened, and therefore, there is a possibility that the hardness and elasticity of the gel cannot be sufficiently obtained (that is, the gel becomes excessively soft). Further, it is considered that the styrene-based thermoplastic elastomer has a network structure of a plurality of aggregation regions formed by the interaction of the styrene-based hard segment and an olefin-based soft segment connecting the plurality of aggregation regions, and therefore, the styrene-based thermoplastic elastomer exhibits a function as an elastomer. It is considered that such a mesh-like network structure has a function of appropriately releasing and holding the oil agents (i.e., the aliphatic hydrocarbon oil (B) and the fatty acid triglyceride (C)) described later.
The block copolymer preferably contains 10 to 50 mass% of a styrene block component and about 50 to 90 mass% of an olefin block component, and more preferably contains 15 to 40 mass% of a styrene block component and about 60 to 85 mass% of an olefin block component. When the amount of the styrene-based block component is less than 10% by mass, the amount of the styrene-based block component forming the aggregation region is small, and therefore, the styrene-based thermoplastic elastomer becomes difficult to form the network structure in the mesh form. On the other hand, when the amount of the styrene-based block component exceeds 50 mass%, the amount of the olefin-based block component that holds the oil agent or the like becomes small, so that the amount of the oil agent or the like that can be held becomes small, and further, since the amount of the aggregation region formed by the styrene-based hard segment becomes large, there is a concern that the gel becomes hard after application to the topsheet, and the wearing feeling of the absorbent article becomes poor.
In the present invention, the styrene-based thermoplastic elastomer mixture (a) is composed of a mixture of two styrene-based thermoplastic elastomers (a1, a2) having different weight average molecular weights.
Of the two styrene-based thermoplastic elastomers (a1, a2), the styrene-based thermoplastic elastomer (a1) having a lower weight average molecular weight (hereinafter, sometimes referred to as "low molecular weight styrene-based thermoplastic elastomer (a 1)") has a weight average molecular weight in the range of 10 to less than 18 ten thousand, preferably 10 to 15 ten thousand. When the weight average molecular weight is less than 10 ten thousand, the hardness of the gel after application to the surface sheet is reduced (i.e., the gel becomes excessively soft). Of the two styrene-based thermoplastic elastomers (a1, a2), the styrene-based thermoplastic elastomer (a2) having a higher weight average molecular weight (hereinafter, sometimes referred to as "high molecular weight styrene-based thermoplastic elastomer (a 2)") has a weight average molecular weight in the range of 18 to 30 ten thousand, preferably 22 to 28 ten thousand. When the weight average molecular weight exceeds 30 ten thousand, there is a concern that the hardness of the gel may be lowered (that is, the gel may become excessively soft) or stickiness may occur.
The styrene-based thermoplastic elastomer mixture (A) preferably has a dispersity (i.e., a ratio (Mw/Mn) of a weight-average molecular weight (Mw) to a number-average molecular weight (Mn)) in a range of 1.25 to 1.60. When the dispersion degree is within such a range, the gel is likely to have an appropriate hardness, and the oil agent is likely to be discharged in an appropriate amount.
The respective weight average molecular weights (Mw) of the two styrene-based thermoplastic elastomers (a1, a2) and the styrene-based thermoplastic elastomer mixture (a) and the dispersity (Mw/Mn) of the styrene-based thermoplastic elastomer mixture (a) can be determined by GPC (gel permeation chromatography) measurement under the following conditions with Tetrahydrofuran (THF) as a mobile phase and in terms of polystyrene.
[ GPC measurement conditions ]
The device comprises the following steps: GPC-8220 (manufactured by imperial ceramics ソ;)
(high molecular chromatography) column: shodex LF-804 (manufactured by Showa Denko K.K.)
Temperature: 40 deg.C
Solvent: THF (tetrahydrofuran)
Flow rate: 1.0 mL/min
Sample concentration: 0.05 to 0.6 mass%
Injection amount: 0.1mL
And (3) detection: r1 (differential refractometer)
As described above, in the present invention, the gel composition contains a mixture of two styrene-based thermoplastic elastomers (a1, a2) having different weight average molecular weights, but the amount of the thermoplastic elastomer is in the range of (a1)/(a2) 95/5 to 50/50, preferably 90/10 to 60/40, and more preferably 80/20 to 70/30, as calculated from the mass ratio of the low-molecular-weight styrene thermoplastic elastomer (a1) to the high-molecular-weight styrene thermoplastic elastomer (a 2). In the above-mentioned mass ratio, when the blending ratio of the low molecular weight styrene-based thermoplastic elastomer (a1) exceeds 95, the hardness of the gel after application to the surface sheet becomes insufficient, and when the blending ratio is less than 50, the amount of the oil agent discharged from the gel may decrease.
In the present invention, the gel composition further comprises a viscosity at 37.8 ℃ of 5 to 50mm2An aliphatic hydrocarbon oil (B) in terms of/s. The aliphatic hydrocarbon oil (B) is not particularly limited as long as it is an aliphatic compound composed of carbon and hydrogen, and may be any of a saturated aliphatic hydrocarbon oil and an unsaturated aliphatic hydrocarbon oil.
Examples of the saturated aliphatic hydrocarbon oil include a fluid paraffin, hydrogenated polyisobutene, an α -olefin oligomer, and squalane. Examples of the unsaturated fatty acid hydrocarbon oil include squalane and polybutane. Among them, hydrogenated polyisobutene is particularly preferably used as the aliphatic hydrocarbon oil (B) because it is less likely to cause stickiness due to discharged oil agent and can more effectively exhibit the above lubricating effect.
The aliphatic hydrocarbon oil (B) has a kinematic viscosity of 5 to 50mm at 37.8 DEG C2In the range of 10 to 30mm, preferably2More preferably 10 to 20mm in the range of/s2In the range of/s. When the dynamic viscosity is less than 5mm2In the case of s, the aliphatic hydrocarbon oil (B) is likely to volatilize during the production of the gel composition, and thus the physical properties of the gel after application to the surface sheet may fluctuate. On the other hand, when the kinematic viscosity exceeds 50mm2At the time of/s, the gel becomes hard after application to the surface sheet, and the amount of the oil agent discharged decreases. The dynamic viscosity of the aliphatic hydrocarbon oil (B) can be measured at a test temperature of 37.8 ℃ by using a Cannon-Fenske dynamic viscometer in accordance with "dynamic viscosity test method 5" of JIS K2283: 2000.
The amount of the aliphatic hydrocarbon oil (B) is in the range of 500 to 4800 parts by mass, preferably 800 to 3000 parts by mass, and more preferably 1000 to 1500 parts by mass, per 100 parts by mass of the styrene-based thermoplastic elastomer mixture (a). When the amount is less than 500 parts by mass, the gel becomes hard after application to the surface sheet. On the other hand, when the amount exceeds 4800 parts by mass, the gel becomes too soft, and it becomes difficult to maintain the shape of the gel.
In the present invention, the gel composition further comprises a fatty acid triglyceride (C) having 8 to 22 carbon atoms which is liquid at 20 ℃ (i.e., normal temperature). The fatty acid triglyceride used in the present invention can be obtained, for example, by subjecting glycerin and one or more fatty acids to a dehydration synthesis reaction without a catalyst, or by subjecting glycerin and one or more fatty acid alcohol esters to a transesterification reaction.
Examples of the fatty acid triglyceride that can be used in the present invention include saturated fatty acid triglycerides (c1) containing 8 to 12 carbon atoms, which are obtained by using saturated fatty acids such as capric acid, caprylic acid, and lauric acid. Specific examples of commercially available products include パナセ - ト (trade name) manufactured by Nichio oil Co., Ltd., ココナ - ド (trade name) manufactured by Kao corporation, and ODO manufactured by Nissin オイリオ (Co., Ltd.).
Further, examples of the fatty acid triglyceride that can be used in the present invention include unsaturated fatty acid triglycerides having 14 to 22 carbon atoms (c2), such as oleic acid triglyceride. Specific examples of commercially available products include: olive oil, soybean oil, camellia oil, sunflower seed oil, rapeseed oil, sesame seed oil, corn oil, cottonseed oil, safflower oil, jojoba oil, sunflower seed oil, and the like. Among them, olive oil, camellia oil and sunflower oil containing oleic acid triglyceride in a proportion of 70 mass% or more are particularly preferable.
The amount of the fatty acid triglyceride (C) is in the range of 60 to 1000 parts by mass, preferably 80 to 900 parts by mass, and more preferably 100 to 700 parts by mass, based on 100 parts by mass of the styrene thermoplastic elastomer mixture (A). If the amount is less than 60 parts by mass, the amount of the oil agent discharged decreases, while if it exceeds 1000 parts by mass, the amount of the oil agent discharged becomes too large, and stickiness may occur in some cases.
In the present invention, it is preferable to use a mixture of two types of fatty acid triglycerides (C1, C2) having different carbon numbers as the fatty acid triglyceride (C). The specific amount of these components is preferably in the range of (c1)/(c2) 95/5 to 50/50, in terms of improving the hardness and lubricating effect of the gel, by containing a saturated fatty acid triglyceride (c1) having 8 to 12 carbon atoms and an unsaturated fatty acid triglyceride (c2) having 14 to 28 carbon atoms in a mass ratio of the saturated fatty acid triglyceride (c1) to the unsaturated fatty acid triglyceride (c 2). When the fatty acid triglyceride (C) contains the saturated fatty acid triglyceride (C1) having 8 to 12 carbon atoms and the unsaturated fatty acid triglyceride (C2) having 14 to 22 carbon atoms in a mass ratio within the above range, a gel having more appropriate hardness can be obtained and a more excellent lubricating effect can be exhibited.
In the present invention, the gel composition may contain a silicone oil (D) in addition to the styrene-based thermoplastic elastomer mixture (a), the aliphatic hydrocarbon oil (B), and the fatty acid triglyceride (C) in order to further enhance the effect of the present invention. The amount of the silicone oil (D) is preferably in the range of 5 to 60 parts by mass per 100 parts by mass of the styrene-based thermoplastic elastomer mixture (a). When the amount of the silicone oil (D) is within such a range, an appropriate amount of the oil agent can be released even when the content of the oil agent in the gel composition is small, and therefore, no stickiness occurs and a more excellent lubricating effect can be exhibited.
In the present invention, the gel composition may contain other additives used in general cosmetics, skin care agents, and the like, as long as the effects of the present invention are not impaired. Examples of such additives include antioxidants, light stabilizers, colorants, pigments, and perfumes.
The gel composition used in the present invention can be produced by adding the above-mentioned various components simultaneously or in an arbitrary order and melt-mixing them. The means for melt-mixing is not particularly limited, and any known means may be used. Examples of such means include means using a mixing device such as a single-screw extruder, a twin-screw extruder, a roll, a Banbury mixer, various kneaders, and a compounding kettle.
The gel composition used in the present invention is excellent in hardness and elongation, and has a suitable release property (slow release property) of the oil agent, and therefore, can be applied to various application apparatuses or molding apparatuses while suppressing adhesion thereto, and can be molded arbitrarily (for example, extrusion molding, injection molding, dip molding, or the like). Further, since the gel composition contains a styrene-based thermoplastic elastomer having a low molecular weight in an amount larger than that of a styrene-based thermoplastic elastomer having a high molecular weight, the gel composition exhibits appropriate fluidity even under a temperature condition of about 100 ℃.
The gel composition having the above-described specific composition is disposed on the surface of the absorbent article that is in contact with the skin of the wearer. In the present invention, the surface that comes into contact with the skin surface of the wearer includes a surface that comes into contact with the wearer during movement or body pressure application, in addition to a surface that actually comes into contact with the skin surface of the wearer when the absorbent article of the present invention is worn by the wearer. Examples of such a surface include a surface on the skin surface side of the topsheet, a surface on the skin surface side of a topsheet (see the topsheet 4 of the sanitary napkin according to the above-described embodiment), and a three-dimensional gather or the like.
In the sanitary napkin 1 according to one embodiment of the present invention, the gel-like composition 6 is disposed on the skin surface side surface of the topsheet 2. In this way, when the gel composition is disposed on the skin surface side surface of the topsheet that is most likely to come into contact with the skin surface of the wearer, the effect of the gel composition can be more reliably exhibited.
In the sanitary napkin 1 according to one embodiment of the present invention, the gel-like composition 6 is continuously extended along the longitudinal direction L of the sanitary napkin 1 in a plan view on the skin surface side of the topsheet 2, and is arranged in a plurality of stripes arranged at predetermined intervals in the width direction W (see fig. 1). In the absorbent article of the present invention, the arrangement form of the gel-like composition is not limited to this, and for example, the gel-like composition may be discontinuously (intermittently) arranged over the entire region in the longitudinal direction L of the absorbent article (that is, over both end portions in the longitudinal direction L), or may be continuously or discontinuously arranged in a partial region in the longitudinal direction L of the absorbent article.
Fig. 2 is a plan view showing a sanitary napkin 1' (absorbent article) according to another embodiment of the present invention. In fig. 2, the same members (for example, the topsheet 2, the absorbent body 3, and the like) as those of the sanitary napkin 1 shown in fig. 1 are given the same reference numerals. In the sanitary napkin 1 'according to the present embodiment, the gel composition 6' is disposed on the skin surface side of the topsheet 2 in a dot form in which a plurality of dots are arranged in a staggered manner in a plan view.
As described in the above embodiments, when the gel-like composition is arranged in a stripe or dot shape, the arrangement region of the gel-like composition having water repellency and the non-arrangement region of the gel-like composition are formed on the skin-side surface of the surface sheet, and therefore, the liquid excrement such as urine supplied onto the skin-side surface of the surface sheet can be easily taken into the interior of the surface sheet through the non-arrangement region of the gel-like composition by the additive effect of the repulsive action to water (liquid excrement such as urine) due to the water repellency in the arrangement region of the gel-like composition and the water absorbing action due to the hydrophilicity inside of the surface sheet in the non-arrangement region of the gel-like composition. With this, in the absorbent article in which the gel-like composition is disposed as in the above-described various embodiments, not only the above-described effects relating to the hardness of the gel and the lubricating effect can be obtained, but also excellent liquid permeability and liquid drainage can be exhibited as the absorbent article.
The gel composition is preferably disposed in an area ratio of 1 to 50% of the area ratio of the region (i.e., an area ratio of 3 to 40% of the area ratio of the region), and particularly preferably in an area ratio of 5 to 30% of the area ratio of the region) in a region where the topsheet and the absorber overlap each other in a plan view (i.e., an area overlapping each other in the thickness direction). When the gel-like composition is disposed at an area ratio of less than 1% of the above-mentioned region, the amount of the gel-like composition on the top sheet is too small, and therefore, the effect of the gel-like composition cannot be sufficiently exhibited. On the other hand, when the gel-like composition is disposed at an area ratio exceeding 50% of the above-mentioned area, the area on the topsheet on which the gel-like composition is disposed does not absorb the liquid excreta, and therefore, the area on the topsheet capable of absorbing the liquid excreta is too small, and there is a concern that the absorption performance of the absorbent article may be deteriorated.
In the present invention, the surface sheet is preferably 1 to 30g/m2More preferably 2 to 20g/m2Particularly preferably 3 to 10g/m2The content of (3) contains the above gel composition. In the present specification, the content of the gel composition can be determined by the following measurement method.
[ method for measuring the content of gel composition contained in surface sheet ]
(1) For example, a sample for measuring the content is obtained by cutting a surface sheet in which a gel composition is disposed within a predetermined range to be measured with a sharp tool such as a cutter instead of a knife so as not to change the thickness.
(2) The area of the cut sample was determined: SA (m)2) And the mass: SM0(g)。
(3) The sample after the measurement is immersed in a solvent in which the gel composition can be dissolved, such as an aromatic solvent (e.g., xylene), and stirred for at least 3 minutes to dissolve the gel composition in the solvent.
(4) After the sample in the solvent was filtered by using a filter paper whose mass was measured in advance, the sample was washed sufficiently with the solvent directly on the filter paper. The sample after washing was sufficiently dried in an oven at 100 ℃ together with the filter paper.
(5) Determination of the Filter after dryingThe mass of the paper and the sample was calculated by subtracting the mass of the filter paper measured in advance from the value: SM1(g)。
(6) The content G of the gel composition was calculated by the following formula (1)BS(g/m2)
[ mathematical formula 1]
GBS(g/m2)＝[SM0(g)-SM1(g)]/SA(m2) (1)
The content of the gel composition is adjusted so that the total area of the sample exceeds 100cm to reduce measurement errors2The method (2) is a method in which a plurality of samples are cut from a plurality of absorbent articles, the measurement operations (2) to (6) are performed on the respective samples, and the content G obtained from the respective measurement operations is usedBSAverage value of (a).
In the present invention, the method of disposing the gel-like composition on the surface of the absorbent article (for example, the surface on the skin surface side of the topsheet) is not particularly limited, and any known application method can be employed. For example, an extrusion device equipped with a nozzle may be utilized; non-contact coaters such as a spiral coater, a curtain coater, a sprayer, and a dip coater; a coating apparatus such as a contact coater, which applies the gel composition to the surface of the absorbent article.
The gel-like composition may be applied to the surface sheet at the time of producing a raw material for the surface sheet such as a nonwoven fabric or may be applied to the surface sheet on a production line for producing an absorbent article, but from the viewpoint of facility investment control, the gel-like composition is preferably applied to the surface sheet on the production line for producing an absorbent article, and particularly, from the viewpoint of suppressing contamination due to the falling off of an oil agent or the like, the gel-like composition is preferably applied to the surface sheet in a step downstream of the production line (for example, immediately before the step of individually packaging the products or the like).
Next, various members constituting the absorbent article of the present invention will be described in more detail.
[ surface sheet ]
In the absorbent article of the present invention, the liquid-permeable top sheet may be a sheet-like fibrous structure such as a nonwoven fabric or a woven fabric. When a nonwoven fabric or woven fabric is used as the surface sheet, examples of fibers constituting the nonwoven fabric or woven fabric include natural fibers, chemical fibers, and the like, and more specifically, cellulose fibers such as ground pulp and cotton; regenerated cellulose such as rayon and fibril rayon; semi-synthetic celluloses such as acetate fibers and triacetate fibers; thermoplastic hydrophobic chemical fibers; thermoplastic hydrophobic chemical fibers subjected to hydrophilization treatment, and the like. Further, examples of the thermoplastic hydrophobic chemical fiber include: fibers made of Polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and the like, fibers made of a graft polymer of PE and PP, and the like.
Examples of the nonwoven fabric include: through-air nonwovens, spunbond nonwovens, point-bond nonwovens, spunlaced nonwovens, needle punched nonwovens, meltblown nonwovens, combinations thereof (e.g., SMS, etc.), and the like.
In addition, it is preferable that the foregoing nonwoven fabric or woven fabric is subjected to a hydrophilization treatment. The method of hydrophilization treatment is not particularly limited, and examples thereof include: a method of applying a hydrophilizing agent to the surface of a nonwoven fabric or a woven fabric, a method of applying a hydrophilizing agent to the surface of fibers constituting a nonwoven fabric or a woven fabric, a method of incorporating a hydrophilizing agent into a synthetic resin as a raw material of fibers constituting a nonwoven fabric or a woven fabric, and the like.
[ Back sheet ]
In the absorbent article of the present invention, as the liquid impermeable back sheet, a film containing PE, PP, or the like, a resin film having air permeability, a laminate obtained by bonding a nonwoven fabric such as spunbond or spunlace with a resin film having air permeability, a multi-layer nonwoven fabric such as SMS, or the like can be used. When considering the flexibility of the absorbent article, for example, the basis weight is preferably from about 15 to about 30g/m2Low Density Polyethylene (LDPE) film.
In the present invention, the absorbent article may include an intermediate sheet having liquid diffusibility in the planar direction (particularly, the longitudinal direction L) between the top sheet and the absorbent body and/or between the back sheet and the absorbent body. As such an intermediate sheet, a sheet similar to the sheet-like fibrous structure constituting the surface sheet can be used.
[ absorbent body ]
In the absorbent article of the present invention, the absorbent body is not particularly limited, and any absorbent body known in the art may be used. Examples of the absorbent body that can be used in the absorbent article of the present invention include an absorbent body in which an absorbent core made of an absorbent material is covered with a hydrophilic core wrap sheet. Examples of the absorbent material constituting the absorbent core include hydrophilic fibers, super absorbent polymers, and the like, and more specifically, cellulose such as ground pulp and cotton; regenerated cellulose such as rayon and fibril rayon; semi-synthetic celluloses such as acetate fibers and triacetate fibers; a thermoplastic hydrophobic chemical fiber subjected to hydrophilic treatment; a granular material comprising a high-absorbency polymer such as a sodium acrylate copolymer; and any combination of two or more of them.
The core wrap sheet is not particularly limited as long as it has a liquid permeability to the extent that liquid excreta such as body fluid discharged from the human body can pass therethrough and a barrier property to the extent that the absorbent material of the absorbent core wrapped in the sheet does not pass therethrough, and examples thereof include sheet-like fibrous structures such as tissue, nonwoven fabric, and woven fabric.
Other examples of the absorbent body that can be used in the absorbent article of the present invention include absorbent sheets made of absorbent fibers and/or absorbent polymers, and the thickness thereof is not particularly limited, but is preferably in the range of 0.3 to 5.0 mm. As such an absorbent sheet, any absorbent sheet may be used without particular limitation as long as it is used in a general absorbent article such as a sanitary napkin.
The present invention can be applied to various absorbent articles such as pantiliners, diapers, and (light) incontinence pads, in addition to the sanitary napkins of the above embodiments. Since such absorbent articles such as sanitary napkins, pantiliners, diapers, and urine-absorbing pads are applied to the skin surface of a portion particularly sensitive to irritation, the effects of the gel composition can be enjoyed more comfortably.
In addition, the present invention can be applied to a nonwoven fabric in addition to the absorbent article described above. The nonwoven fabric of the present invention has a gel-like composition having the above-described specific composition in at least a part of an area of the nonwoven fabric or a product using the nonwoven fabric, which area is in direct contact with the skin of a user.
Since the gel-like composition having the above specific composition has an appropriate hardness and easily releases an oil even under a light load, the nonwoven fabric of the present invention having such a gel-like composition on the surface can exhibit an excellent lubricating effect without causing stickiness, and the nonwoven fabric or a product using the nonwoven fabric can provide a comfortable feeling of use, wearing feeling, and lubricating effect.
In such a nonwoven fabric, the gel-like composition may be disposed in the same manner as in the above-described embodiment of the sanitary napkin (i.e., in stripes or dots) in at least a part of the region that can be in direct contact with the skin of the user. Examples of products using the nonwoven fabric include: masks, wet tissues, etc.
Examples
The present invention will be described more specifically below by referring to examples of the present invention and comparative examples, but the present invention is not limited to these examples.
In the production of the gel-like compositions in the absorbent articles of the examples and comparative examples of the present invention, the following commercially available products were used as each of the components.
1) Styrene thermoplastic elastomer (A1, A2)
a) Low molecular weight styrene thermoplastic elastomer (A1)
セプトン (septon triblock copolymer) 8004 (styrene-ethylene-butylene-styrene block copolymer (SEBS) with Mw of 11 ten thousand, manufactured by クラレ K.K.)
b) Low molecular weight styrene-based thermoplastic elastomer (A1')
クレイトン G1652 (styrene-ethylene-butylene-styrene block copolymer (SEBS) having an Mw of 8 ten thousand, manufactured by クレイトン ポ リ マ -Co., Ltd.)
c) High molecular weight styrene thermoplastic elastomer (A2)
クレイトン G1654 (styrene-ethylene-butylene-styrene block copolymer (SEBS) having an Mw of 20 ten thousand, manufactured by クレイトン ポ リ マ -Co., Ltd.)
セプトン (septon triblock copolymer) 2005 (styrene-ethylene-butylene-styrene block copolymer (SEPS) having Mw of 26 ten thousand, manufactured by クラレ K.K.)
2) Oil preparation
a) Aliphatic hydrocarbon oil (B)
パ - ルリ - ム EX (kinematic viscosity at 37.8 ℃ C. of 10 mm)2Hydrogenated polyisobutene/s, manufactured by Nichisu oil Co., Ltd.)
パ - ルリ - ム 6 (kinematic viscosity at 37.8 ℃ C. of 20 mm)2Hydrogenated polyisobutene/s, manufactured by Nichisu oil Co., Ltd.)
b) Aliphatic hydrocarbon oil (B')
Flowing Paraffin (dynamic viscosity at 37.8 ℃ C. of 75 mm)2(ii) mobile Paraffin of/s, manufactured by MORESCO
c) Fatty acid triglyceride (C)
パナセ - ト 810S (fatty acid triglycerides of capric acid and caprylic acid, manufactured by Nichio oil Co., Ltd.)
Refined olive oil (olive oil, manufactured by DSP Wuxi & food chemistry Co., Ltd.)
Rapeseed refined rapeseed oil (rapeseed oil, manufactured by showa industrial company)
d) Other ester oil (C')
サラスコ 816T (2-cetyl ethylhexanoate, manufactured by Nisshin オイリオ グ ル - プ Co., Ltd.)
3) Other oil (D)
SH200-100cs (kinematic viscosity at 25 ℃ of 100 mm)2Dimethyl polysiloxane (silicone oil) by imperial レ, ダウコ - ニング (manufactured by DONG)
1. Preparation of gel composition
The above-mentioned components were placed in a separable flask in the respective mixing amounts shown in Table 1 below, and melt-mixed at 130 ℃ for 5 hours while stirring the contents, followed by cooling to obtain gel-like compositions Nos. 1-1 to 1-9 and 2-1 to 2-6. The properties of each of the obtained gel-like compositions were evaluated by the following test methods. The composition and physical properties (weight average molecular weight and dispersion degree) of each gel composition are shown in table 1, and the evaluation results obtained by various test methods are shown in table 2.
2. Evaluation of gel composition
[ test of physical Properties ]
(1) Hardness of
Using the gel composition thus obtained, a test piece was prepared which was composed of a cylindrical gel having a diameter of 40mm and a thickness of 8 mm. The test piece was placed in a small bench test machine EzTest (manufactured by Shimadzu corporation) equipped with a compression jig made of stainless steel having a diameter of 120mm, and the test force (N) when the test piece was compressed by 4mm at a rate of 5 mm/min was measured. The measured values were evaluated according to the following criteria. The measurement results and evaluation results are shown in table 2 below.
O: 10N or more and 40N or less
X: less than 10N, or more than 40N
(2) Discharge property
Using the obtained gel-like composition, a test piece was prepared which was composed of a cylindrical gel having a diameter of 40mm and a thickness of 8 mm. On the top surface of the prepared test piece, a mass (W) measured in advance was placed1) The commercially available tissue paper (one set of two sheets) was placed under a load of 10g at room temperature (23 ℃) for 24 hours, and then the tissue paper was removed to measure its mass (W)2). Then, the mass (W) of the tissue is measured in advance1) And measured after standing for 24 hoursQuality of tissue (W)2) The tissue paper mass increase rate (%) was calculated based on the following formula (2), and the tissue paper mass increase rate (%) was evaluated as a release amount according to the following criteria. The measurement results and evaluation results are shown in table 2 below.
[ mathematical formula 2]
Mass increase rate (%) - (W)2-W1)/W1×100 (2)
O: the mass increase rate (release amount) is 2% to 10%
X: the mass increase rate (discharge amount) is less than 2% or more than 10%
[ Table 1]
3. Absorbent article manufacturing
The gel-like compositions nos. 1-1 to 1-9 and 2-1 to 2-6 obtained by the above-described methods were applied in the form of a plurality of stripes extending in the longitudinal direction on the skin-side surface of a top sheet of a commercially available sanitary napkin, thereby obtaining absorbent articles (sanitary napkins) of examples 1 to 9 and comparative examples 1 to 6.
4. Evaluation of absorbent article
[ functional test ]
The absorbent articles of examples 1 to 9 and comparative examples 1 to 6 obtained as described above were left at 23 ℃ overnight, and then the feel when the fingers were reciprocated 10 times to the left and right on the surface on the skin surface side of the top sheet of the absorbent article was evaluated from the viewpoint of "softness" and "stickiness". Further, after the skin surface side surface of the top sheet (i.e., the surface coated with the gel composition) was attached to the back of the hand and left for 15 minutes, the state of the skin was confirmed, and the "lubricating effect" was evaluated. These evaluations were conducted by ten subjects, and the evaluation criteria below were used to make a query. The results of the consultations were rated based on the total points of ten individuals.
In the evaluation of the above-described lubricating effect, it is previously described that the lubricating effect means "an effect of suppressing evaporation of water from the skin by the action of an oily film to soften the skin" for the subject.
(i) Softness
And 3, point: has elasticity and softness
And 2, point: is resilient but stiff
Point 1: non-elastic and hard, or non-elastic and soft
(ii) Stickiness
And 3, point: the finger is not sticky due to the oil
And 2, point: stickiness of fingers due to oil
Point 1: finger does not wet
(iii) Lubricating effect
And 3, point: the lubricating effect is felt as a result of the contact,
and 2, point: the lubricating effect is not so felt
Point 1: the lubricating effect is not felt at all
The total number of points of each of the functional tests (i) to (iii) is determined based on the following criteria. The total number of points of each functional test and the evaluation results are shown in table 2 below (the number in parentheses in the table indicates the total number of points of each functional test).
< evaluation of Total Point >
Very good: the total number of points is more than 26
O: the total number of points is more than 21 points and less than 26 points
And (delta): the total number of points is more than 15 points and less than 21 points
X: the total number of points is less than 15
[ Table 2]
As shown in Table 2, the absorbent articles of examples 1 to 9 showed good results in all the evaluations of the physical property test and the function test of the gel-like compositions No.1-1 to 1-9 used. In particular, the gel-like compositions nos. 1 to 8 used in the absorbent article of example 8 were excellent in oil release properties, and high evaluation results were obtained for the lubricating effect in the functional evaluation of the absorbent article. In addition, although the absorbent article of example 9 used gel-like compositions nos. 1 to 9 had a small amount of fatty acid triglyceride (C) blended, the release of the oil agent was excellent, and high evaluation results were obtained with respect to the lubricating effect in the functional evaluation of the absorbent article.
On the other hand, in the absorbent article of comparative example 1, gel composition No.2-1 used contained only a low molecular weight styrene-based thermoplastic elastomer (a1) as a styrene-based thermoplastic elastomer, and therefore, the hardness of the gel was hard, and the evaluation results of softness and lubricating effect were insufficient in the function evaluation of the absorbent article.
In addition, in the absorbent article of comparative example 2, the viscosity of the aliphatic hydrocarbon oil (B) in the gel composition No.2-2 used was 5 to 50mm2Since the fatty acid triglyceride (C) is not contained outside the range of/s, the gel becomes hard, and the release amount of the oil agent becomes too small, and as a result, the gel also becomes hard and no lubricating effect is felt in the functional evaluation of the absorbent article.
In the absorbent article of comparative example 3, the mass ratio of the low-molecular-weight styrene-based thermoplastic elastomer (a1) to the high-molecular-weight styrene-based thermoplastic elastomer (a2) in the gel-like compositions nos. 2 to 3 used was out of the range of (a1)/(a2) from 95/5 to 50/50, and as a result, the gel hardness was too soft, and insufficient evaluation results were obtained for all of softness, stickiness, and lubricating effect in the functional evaluation of the absorbent article.
In the absorbent article of comparative example 4, the weight average molecular weight of the low molecular weight styrene-based thermoplastic elastomer mixture (a 1') in the gel-like compositions nos. 2 to 4 used was out of the range of 10 to less than 18 ten thousand, and as a result, the gel hardness became too soft, and the amount of oil released became too large, and stickiness was felt in the evaluation of the function of the absorbent article.
In the absorbent article of comparative example 5, since the gel-like compositions nos. 2 to 5 used contained ester oil instead of the fatty acid triglyceride (C), the oil agent release property was poor, and no lubricating effect was felt in the function evaluation of the absorbent article.
Further, in the absorbent article of comparative example 6, since the gel-like compositions nos. 2 to 6 used did not contain the fatty acid triglyceride (C) (that is, did not contain components other than the styrene-based thermoplastic elastomer mixture (a) and the aliphatic hydrocarbon oil (B)), no release of the oil agent was observed, and no lubricating effect was felt in the evaluation of the function of the absorbent article.
Description of the reference numerals
1 sanitary napkin
2 surface sheet
3 absorbent body
4 side sheet
5 embossing part
6 gel composition
Claims (8)
1. An absorbent article comprising a gel-like composition on the surface thereof which is in contact with the skin of a wearer,
the gel composition contains 500 to 4800 parts by mass of a styrene-based thermoplastic elastomer mixture A having a kinematic viscosity at 37.8 ℃ of 5 to 50mm per 100 parts by mass of the mixture2An aliphatic hydrocarbon oil B and 60 to 1000 parts by mass of a C8 to C22 fatty acid triglyceride C which is liquid at 20 ℃,
the styrene thermoplastic elastomer mixture A contains: a styrene-based thermoplastic elastomer A1 having a weight-average molecular weight of 10 to less than 18 ten thousand and comprising a triblock or higher block copolymer, and a styrene-based thermoplastic elastomer A2 having a weight-average molecular weight of 18 to 30 ten thousand and comprising a triblock or higher block copolymer, wherein the mass ratio of the styrene-based thermoplastic elastomer A1 to the styrene-based thermoplastic elastomer A2 is A1/A2 of 95/5 to 50/50,
the fatty acid triglyceride C contains C8-12 saturated fatty acid triglyceride C1 and C14-22 unsaturated fatty acid triglyceride C2, and the mass ratio of the saturated fatty acid triglyceride C1 to the unsaturated fatty acid triglyceride C2 is C1/C2, which is 95/5-50/50.
2. The absorbent article according to claim 1, wherein the block copolymer has two or more block components comprising styrene-based hard segments in the molecular chain.
3. The absorbent article according to claim 2, wherein the block components at least two ends of the molecular chain of the block copolymer are block components composed of the styrene-based hard segments.
4. The absorbent article according to claim 1, wherein the aliphatic hydrocarbon oil B is hydrogenated polyisobutene.
5. The absorbent article according to claim 1, wherein the absorbent article comprises a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body located between the top sheet and the back sheet,
the surface to be in contact with the skin surface of the wearer is the surface of the top sheet on the skin surface side.
6. The absorbent article according to claim 5, wherein the gel composition is disposed in a stripe or dot shape in a plan view on the skin surface side of the topsheet.
7. The absorbent article of claim 1, wherein the absorbent article is a sanitary napkin, a pantiliner, a diaper, or a urine isolation pad.
8. A nonwoven fabric having a gel-like composition on the surface thereof, wherein,
the gel composition contains 500-4800 parts by mass of a styrene-based thermoplastic elastomer mixture A at 37.8 DEG CThe viscosity is 5-50 mm2An aliphatic hydrocarbon oil B and 60 to 1000 parts by mass of a C8 to C22 fatty acid triglyceride C which is liquid at 20 ℃,
the styrene thermoplastic elastomer mixture A contains: a styrene-based thermoplastic elastomer A1 having a weight-average molecular weight of 10 to less than 18 ten thousand and comprising a triblock or higher block copolymer, and a styrene-based thermoplastic elastomer A2 having a weight-average molecular weight of 18 to 30 ten thousand and comprising a triblock or higher block copolymer, wherein the mass ratio of the styrene-based thermoplastic elastomer A1 to the styrene-based thermoplastic elastomer A2 is A1/A2 of 95/5 to 50/50,
the fatty acid triglyceride C contains C8-12 saturated fatty acid triglyceride C1 and C14-22 unsaturated fatty acid triglyceride C2, and the mass ratio of the saturated fatty acid triglyceride C1 to the unsaturated fatty acid triglyceride C2 is C1/C2, which is 95/5-50/50.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015238013A JP6415420B2 (en) | 2015-12-04 | 2015-12-04 | Absorbent articles |
| JP2015-238013 | 2015-12-04 | ||
| PCT/JP2016/073784 WO2017094290A1 (en) | 2015-12-04 | 2016-08-12 | Absorbent article |
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|---|---|
| CN108348364A CN108348364A (en) | 2018-07-31 |
| CN108348364B true CN108348364B (en) | 2020-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201680062122.0A Active CN108348364B (en) | 2015-12-04 | 2016-08-12 | Absorbent article |
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| JP (1) | JP6415420B2 (en) |
| CN (1) | CN108348364B (en) |
| AU (1) | AU2016364173B9 (en) |
| WO (1) | WO2017094290A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6366640B2 (en) * | 2016-05-31 | 2018-08-01 | 花王株式会社 | Non-woven |
| JP7281398B2 (en) * | 2019-12-27 | 2023-05-25 | ユニ・チャーム株式会社 | absorbent article |
| JP7286533B2 (en) * | 2019-12-27 | 2023-06-05 | ユニ・チャーム株式会社 | absorbent article |
| WO2021132618A1 (en) * | 2019-12-27 | 2021-07-01 | ユニ・チャーム株式会社 | Absorbent article |
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| US6884494B1 (en) * | 1999-12-21 | 2005-04-26 | The Procter & Gamble Company | Laminate web |
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| EP1108406A3 (en) * | 2000-07-21 | 2001-07-11 | The Procter & Gamble Company | Dark colored absorbent articles |
| WO2002009781A2 (en) * | 2000-07-28 | 2002-02-07 | The Dow Chemical Company | Sulfonated substantially random interpolymer-based absorbent materials |
| JP5148791B2 (en) * | 2000-09-28 | 2013-02-20 | ユニ・チャーム株式会社 | Absorbent article and barrier agent for absorbent article |
| EP1992366B1 (en) * | 2007-05-15 | 2011-07-06 | The Procter & Gamble Company | Use of a lotion composition on an absorbent article for reducing adherence of feces or menses to the skin |
-
2015
- 2015-12-04 JP JP2015238013A patent/JP6415420B2/en active Active
-
2016
- 2016-08-12 WO PCT/JP2016/073784 patent/WO2017094290A1/en active Application Filing
- 2016-08-12 CN CN201680062122.0A patent/CN108348364B/en active Active
- 2016-08-12 AU AU2016364173A patent/AU2016364173B9/en not_active Ceased
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1365378A (en) * | 1999-07-28 | 2002-08-21 | 陶氏化学公司 | Hydrogenated block polymers having elasticity and articles made therefrom |
| US6884494B1 (en) * | 1999-12-21 | 2005-04-26 | The Procter & Gamble Company | Laminate web |
| CN1364445A (en) * | 2000-09-28 | 2002-08-21 | 尤妮佳股份有限公司 | Absorption article and pretector of absorption article |
| JP2004534089A (en) * | 2001-07-03 | 2004-11-11 | ザ プロクター アンド ギャンブル カンパニー | Film-forming compositions for protecting skin from body fluids and articles made therefrom |
| CN102300532A (en) * | 2009-02-02 | 2011-12-28 | 金伯利-克拉克环球有限公司 | Dynamic fitting body adhering absorbent article |
| JP5677611B1 (en) * | 2014-06-30 | 2015-02-25 | ユニ・チャーム株式会社 | Absorbent articles |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108348364A (en) | 2018-07-31 |
| AU2016364173B9 (en) | 2021-01-07 |
| WO2017094290A1 (en) | 2017-06-08 |
| AU2016364173B2 (en) | 2020-08-27 |
| AU2016364173A1 (en) | 2018-04-26 |
| JP2017099824A (en) | 2017-06-08 |
| JP6415420B2 (en) | 2018-10-31 |
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