JP2020163624A - Chemical liquid holding sheet, face mask, and method for manufacturing chemical liquid holding sheet - Google Patents

Abstract

To provide: a chemical liquid holding sheet in which a nonwoven fabric and a film are strongly adhered to each other without impairing touch of the nonwoven fabric; a face mask; and a method for manufacturing the chemical liquid holding sheet.SOLUTION: A chemical liquid holding sheet 10 includes a nonwoven fabric 11 having liquid-holding properties, and a film 12, and integration therebetween is achieved by the configuration in which a thermoplastic elastomer of the film 12 enters a part of spaces between fibers in a discharge treatment surface of the nonwoven fabric 11 after subjected to discharge treatment.SELECTED DRAWING: Figure 1

Description

The present invention relates to a chemical solution holding sheet, a face mask, and a method for manufacturing a chemical solution holding sheet.

For example, as shown in Patent Document 1, a liquid impregnated base material made of a non-woven fabric and a liquid blocking film laminated on the liquid impregnated base material are provided, and the liquid impregnated base material and the liquid blocking film are joined at least partially. The integrated face mask is known. In this face mask, when a liquid impregnated base material containing a beauty essence or a lotion is applied to the face, the liquid blocking film covers the outside of the liquid impregnated base material. Evaporation of the active ingredient can be prevented, and the active ingredient can act on the skin for a long period of time.

Japanese Unexamined Patent Publication No. 2003-135146

However, face masks in recent years are required not only to supply beauty essence and lotion to the skin of the face, but also to have a lift-up function of lifting the cheeks diagonally upward toward the temporal region. Since the face mask of Patent Document 1 uses a resin film as the liquid blocking film, the face mask as a whole has low elasticity and kickback property, and a sufficient lift-up function cannot be obtained.
Further, in the face mask of Patent Document 1, as a method of integrating the liquid impregnated base material and the liquid blocking film, the liquid impregnated base material (nonwoven fabric) is mixed with heat-sealing fibers and integrated by heat fusion, hot. Integration using an adhesive such as melt or integration by stitching is mentioned. However, when heat-sealing fibers are mixed in the non-woven fabric, the heat-sealing fibers dispersed in the non-woven fabric are melted and bonded to other fibers, so that the fibers become hard as a whole, and the adhesion to the face and the touch are improved. It is impaired. Also, when an adhesive such as hot melt is used, the adhesive penetrates into the non-woven fabric, so that the adhesive becomes hard as a whole, and the adhesion to the face and the touch are also impaired. Then, the adhesive may penetrate to the non-woven fabric surface side. Further, when suturing, the suture thread is exposed from the non-woven fabric surface side, and the non-woven fabric surface is not soft to the touch.
An object of the present invention is to provide a laminated sheet and a method for producing a laminated sheet in which the nonwoven fabric and the film are firmly adhered to each other without impairing the feel of the nonwoven fabric.

The chemical liquid holding sheet of the present invention is a chemical liquid holding sheet in which a liquid-retaining non-woven fabric and a film are laminated and integrated, and the film is made of an elastomer composition containing a thermoplastic elastomer, and at least one of the non-woven fabrics. The surface is a discharge-treated surface, the melting point of the thermoplastic elastomer of the film is lower than the melting point or decomposition temperature of the fibers of the non-woven fabric, and the thermoplastic elastomer is a part between the fibers of the discharge-treated surface. It is characterized in that the non-woven fabric and the film are laminated and integrated by entering. Here, "liquid retention" means that it can be retained by impregnating or applying a liquid. Further, here, "entering a part between the fibers of the discharge-treated surface" means that the thermoplastic elastomer has entered the non-woven fabric to the extent that the liquid-retaining property of the non-woven fabric is not impaired.
Such a chemical liquid holding sheet preferably in which the discharge treatment is a corona treatment.
Such a chemical solution holding sheet can be used for various purposes by holding the chemical solution on the non-woven fabric. In particular, it is preferably used for face masks.

The method for producing a chemical liquid holding sheet of the present invention comprises laminating and integrating a liquid-retaining non-woven fabric and a film, wherein the film is composed of an elastomer composition containing a thermoplastic elastomer and is made of fibers of the non-woven fabric. A method for producing a chemical holding sheet in which the melting point of the thermoplastic elastomer of the film is lower than the melting point or the decomposition temperature. At least one surface of the non-woven film is discharge-treated to form a discharge-treated surface, and the discharge-treated surface is in a molten state. Alternatively, the softened film is laminated and both are pressed so that the thermoplastic elastomer of the film enters a part between the fibers of the discharge-treated surface, and the non-woven fabric and the film are laminated and integrated. There is.

In the chemical holding sheet of the present invention, the non-woven fabric and the film are laminated and integrated by inserting a thermoplastic elastomer into a part between the fibers of the discharge-treated surface of the non-woven fabric that has been subjected to the discharge treatment, so that the liquid-retaining property of the non-woven fabric is maintained. The non-woven fabric and the film can be firmly adhered to each other without impairing the touch and the physical properties of the film made of the elastomer composition.

It is a side sectional view which shows one Embodiment of the chemical liquid holding sheet of this invention.

The chemical liquid holding sheet 10 of FIG. 1 has a liquid-retaining non-woven fabric 11 and a film 12, and the thermoplastic elastomer of the film 12 enters a part between the fibers of the discharge-treated surface of the non-woven fabric 11 which has been discharged-treated. It is integrated by. Further, a separator may be provided on the outer surface of the film 12.
Such a chemical solution holding sheet 10 is used by holding the chemical solution on the non-woven fabric 11, and is used, for example, a body fluid absorbing sheet such as a napkin, a diaper, or a wet tissue or a skin cleaning sheet; a face mask, a makeup removing sheet. , Cleansing sheets, body cleaning sheets such as sweat wipes and oil removal sheets, cooling sheets, medicated sheets such as itching control sheets and wipes, and various skin care sheets such as therapeutic sheets; toilet cleaning sheets that hold cleaning liquids, etc. Alternatively, it can be used for various cleaning sheets such as floor cleaning sheets. In particular, it is preferable to use it as a face mask.
When used for a face mask, examples of the chemical solution include a solution containing an active ingredient related to beauty such as a lotion, a cosmetic solution, and a beauty essence. Examples of the active ingredient include a moisturizer, an ultraviolet inhibitor, a whitening agent, and the like.

The non-woven fabric 11 is a sheet-like material in which fibers are entangled and subjected to a discharge treatment, and the melting point or decomposition temperature of the fibers is higher than the melting point of the thermoplastic elastomer of the film 12 as described later. The lower limit of the melting point or decomposition temperature of the fibers of the nonwoven fabric 11 is preferably, for example, 140 ° C. or higher, 150 ° C. or higher, and particularly preferably 180 ° C. or higher. The upper limit of the melting point or the decomposition temperature is 500 ° C. or lower.

Examples of the discharge treatment include corona treatment and plasma treatment. In particular, corona treatment is preferable. In corona treatment, a high-frequency high voltage is applied between a high-voltage electrode and a metal processing roll (counter electrode) to generate a corona discharge, through which the non-woven fabric is passed, and a polar group is applied to the surface of the fibers of the non-woven fabric. Is a process for surface modification. The electric power is preferably 0.5 to 4.0 KW, 1 to 3 KW, and particularly preferably 1.5 to 2.5 KW. The line speed for passing the non-woven fabric is preferably 10 to 80 m / min, 10 to 50 m / min, and particularly preferably 10 to 30 m / min.

The fibers constituting the non-woven fabric 11 are not particularly limited and can be appropriately selected depending on the texture and strength required for the non-woven fabric. For example, natural fibers (plant fiber or animal fiber) such as cotton, linen and silk, and Examples thereof include synthetic fibers such as polyester, polyamide (polyamide 6, polyamide 66, etc.), acrylic, and polyolefin. In particular, those containing cellulose fibers or polyester fibers are preferable, those containing at least polyester fibers are more preferable, and those containing both cellulose fibers and polyester fibers are particularly preferable. Cellulous fibers have good absorbency of water, aqueous solutions, polar solvents, emulsions thereof, etc. that constitute liquid components of cosmetics such as lotions, lotions, and beauty essences. On the other hand, polyester fiber has excellent elasticity and excellent compositeness with a film.

Cellulose fiber means cellulose in a broad sense, and includes natural cellulose fibers such as cotton, silk, and linen, and regenerated cellulose fibers that have been treated with cellulose or a derivative thereof and then returned to cellulose. Examples of the regenerated cellulose fiber include rayon such as viscose rayon, tencel such as acetate and lyocell, cupra, and polynosic.
In particular, those having a decomposition temperature of 170 ° C. or higher, 200 ° C. or higher, particularly 230 ° C. or higher are preferable. For example, rayon and cupra are preferable because they have a high decomposition temperature of 260 ° C. to 300 ° C. These may be used alone or in combination of 2 or more types.

Examples of the polyester fiber include polyethylene terephthalate fiber, polytrimethylene terephthalate fiber, polybutylene terephthalate fiber and the like.
In particular, polyester fibers having a melting point of 170 ° C. or higher, 200 ° C. or higher, and particularly 210 ° C. or higher are preferable. These may be used alone or in combination of 2 or more types.

When the non-woven fabric 11 contains cellulose fibers and polyester fibers, the difference between the decomposition temperature of the cellulose fibers and the melting point of the polyester fibers is preferably 100 ° C. or less, particularly 70 ° C. or less.

When the nonwoven fabric 11 is composed of cellulose fibers and other fibers (other than polyester fibers), the mixing ratio of the other fibers is 20% by weight or less, preferably 10% by weight or less, particularly preferably 5% by weight, based on the cellulose fibers. It is as follows.
When the nonwoven fabric 11 is composed of polyester fibers and other fibers (other than cellulose fibers), the mixing ratio of the other fibers is 20% by weight or less, preferably 10% by weight or less, particularly preferably 5% by weight, based on the polyester fibers. It is as follows.
When the nonwoven fabric 11 is substantially composed of polyester fibers and cellulose fibers, the weight ratio of the polyester fibers to the cellulose fibers is 90:10 to 10:90, 80:20 to 50:50, and particularly 80:20 to 60: It is preferably 40. If the cellulose fiber content is less than 10% by weight, the liquid retention property of the lotion or the like deteriorates. When other fibers are mixed in addition to the cellulose fibers and the polyester fibers, the mixing ratio of the other fibers is 20% by weight or less, preferably 10% by weight or less, particularly preferably 5 with respect to the mixture of the cellulose fibers and the polyester fibers. It is less than% by weight.

When synthetic fibers, especially polyester fibers, are used as the nonwoven fabric 11, it is preferable to use crimp fibers having coiled three-dimensional crimps. Since the crimped fiber has a coiled portion, when used as a non-woven fabric, the crimped fiber gives elasticity to the non-woven fabric and gives a soft touch feeling. Further, the crimped fibers are entangled so that the coiled portion surrounds the other fibers, the morphological stability of the non-woven fabric is improved, and fluffing is suppressed, so that the crimped fibers are also good to the touch.
Examples of the crimping fiber having three-dimensional crimping include side-by-side type and core-sheath type crimping fiber, and the crimping fiber is not limited to either of them, but the side-by-side type crimping fiber is particularly preferable. The side-by-side type crimped fiber is a fiber obtained by crimping a composite fiber having a layered structure of resins of the same type having different heat shrinkage rates (or thermal expansion rates) by heating. For example, in the case of side-by-side type polyester crimp fibers, a composite fiber in which a polyester resin having a low heat shrinkage rate is used as a component on one side of the fiber cross section and a polyester resin having a high heat shrinkage rate is used as a component on the other side is crimped by heating. Obtained by.

The average fiber diameter of the fibers (cellulose fiber and polyester fiber) of the non-woven fabric 11 is 10 to 30 μm, preferably 10 to 20 μm, and particularly preferably 11 to 18 μm. When the average fiber diameter is smaller than 10 μm, the fibrous openness of the fiber is lowered. When the average fiber diameter is larger than 30 μm, the non-woven fabric becomes hard and the adhesion to the face is lowered.
The average fiber length is 30 to 75 mm, preferably 35 to 65 mm. When the average fiber length is smaller than 30 mm, the entanglement between the fibers becomes worse. When the average fiber length is longer than 75 mm, the fiber opening property is deteriorated.

Basis weight of the nonwoven fabric 11, 30~120g / ^{m 2,} preferably, 35~100g / ^{m 2,} particularly preferably 40 and 80 g / ^{m 2.} When the basis weight is smaller than 30 g / m ² , the gap between the fibers is large, the amount and depth of the thermoplastic elastomer entering between the fibers of the non-woven fabric is large, and the flexibility as a whole is lowered. When the basis weight is larger than 120 g / m ² , the adhesion to the face is impaired due to the hardness of the non-woven fabric due to the height of the basis weight, and the flexibility as a whole is lowered.
The thickness of the nonwoven fabric 11 (including the portion where the thermoplastic elastomer has penetrated) is 0.4 mm to 3 mm, preferably 0.7 to 2.0 mm, and particularly preferably 0.8 mm to 1.5 mm. It is important to perform an electric discharge treatment, particularly a corona treatment, in order to fix the film to such a thin non-woven fabric to such an extent that it can withstand actual use while maintaining the chemical retention property.

Examples of the method for producing the non-woven fabric include a spunlace method, a needle punch method, a thermal bond method and the like, but are not particularly limited. However, the needle punch method is preferable.

The film 12 is formed by extrusion molding an elastomer composition containing a thermoplastic elastomer as a main component.
Examples of the thermoplastic elastomer include polyester elastomers, polyurethane elastomers, polyamide elastomers, polyolefin elastomers, and polystyrene elastomers such as poly (ethylene-butylene) polystyrene block copolymers.

Here, as polyester-based elastomers, polyurethane-based elastomers, polyamide-based elastomers, etc., these elastomers are thermoplastic elastomers having polyether blocks derived from polyalkylene glycols such as polytetramethylene glycol and polyethylene glycol, or thermoplastic elastomers. Examples thereof include thermoplastic elastomers composed of these and other resins. Among them, polyester elastomers having excellent soft touch, elasticity and kickback property are particularly preferably used. For example, a polyester-based elastomer obtained by copolymerizing a polyester containing polybutylene terephthalate as a main component and a polyether containing polytetramethylene glycol as a main component can be mentioned. The polyester-based elastomer having excellent elasticity and kickback property improves the lift-up effect when used as a face mask.

The melting point of the thermoplastic elastomer may be lower than the melting point or decomposition temperature of the fibers of the non-woven fabric 11, for example, 130 to 180 ° C., preferably 140 to 170 ° C. In particular, it is preferably 30 ° C. or higher, particularly preferably 50 ° C. or higher, lower than the melting point or decomposition temperature of the fibers of the non-woven fabric 11.
The elastomer composition may be composed of a plurality of thermoplastic elastomers for the purpose of desired flexible tactile sensation, elasticity and kickback property depending on the application.
Further, a resin component may be added as long as the object of the present invention is not impaired. In that case, the blending amount of the thermoplastic elastomer in the elastomer composition is preferably 80% by weight to 99.5% by weight, particularly 85% by weight to 95% by weight. In particular, a colorant such as carbon black may be added to the film composition in an amount of about 0.1 to 5% by weight. In such a case, the adhesive performance with the non-woven fabric deteriorates. In particular, it is important to perform corona treatment.

The tensile elastic modulus (ASTMD638) of the film 12 is preferably 25 MPa or less, 20 MPa or less, and particularly preferably 15 MPa or less. If it is larger than 25 MPa, a large force is required when the face mask is applied to the face while being stretched, resulting in poor usability.
The thickness of the film 12 is 10 to 40 μm, preferably 10 to 30 μm, and particularly preferably 12 to 25 μm. If it is thinner than 10 μm, the adhesiveness will be poor. Moreover, it is difficult to mold the film. If it is thicker than 40 μm, the presence of the film 12 is increased and the tactile sensation of the entire face mask is reduced.
The surface of the film 12 may have irregularities. By providing the unevenness, the tackiness of the thermoplastic elastomer can be reduced.
In addition, additives such as lubricants such as talc, antioxidants, ultraviolet absorbers, and pigments may be added to the film 12 as long as the object of the present invention is not impaired. For example, it is preferable to add a pigment so that the film surface and the non-woven fabric surface can be distinguished from each other in appearance.

The non-woven fabric 11 and the film 12 of the chemical liquid holding sheet 10 of FIG. 1 are laminated and integrated with the thermoplastic elastomer of the film 12 entering between the fibers on the discharge-treated surface of the non-woven fabric 11. The average thickness of the thermoplastic elastomer (reference numeral 13 in FIG. 1) observed in the nonwoven fabric 11 observed with an electron microscope is 0.1 to 5 μm, preferably 0.25 to 2 μm, particularly preferably 0. .5-1 μm. If it is shallower than 0.1 μm, the anchor effect cannot be sufficiently obtained, and peeling occurs during lift-up. If it is deeper than 5 μm, the non-woven fabric 11 becomes hard and the tactile sensation as the chemical solution holding sheet 10 deteriorates.
The thickness of the chemical solution holding sheet 10 is 0.5 to 3.5 mm, preferably 0.75 to 2.5 mm, and particularly preferably 1 to 2 mm. In order to obtain such a thin sheet for holding a chemical solution that can withstand actual use while maintaining the holding property of the chemical solution, it is important to perform an electric discharge treatment, particularly a corona treatment.
At this time, the lower limit of the peel strength between the non-woven fabric 11 and the film 12 of the chemical holding sheet 10 is preferably 2N or more, 2.5N or more, particularly 3N or more, which is preferable for use as a chemical holding sheet, particularly a face mask. The upper limit of the peel strength is 10 N or less. The peel strength was measured by measuring a sample having a width of 50 mm and a length of 100 mm under the conditions of a peel angle of 180 degrees and a test speed of 200 mm / min in parallel with the MD direction of the film 12.

The elongation elastic modulus (elongation recovery rate (Z)) of the chemical holding sheet 10 can be obtained in either the MD direction (extrusion direction of the film 12) or the TD direction (direction perpendicular to the extrusion direction of the film 12). , 65% or more, preferably 70% or more, particularly preferably 75% or more. When the recovery rate is lower than 65%, the kickback property is weak and the lift-up function as a face mask is not fully exhibited. As a method for measuring the elongation elastic modulus, a test piece having a width of 10 mm and a length of 150 mm was set in a tensile tester so as to grasp the entire width, and held for 5 minutes with a distance between reference points of 100 mm being 150 mm. Then, the length (X mm) when the test piece is opened and left for 5 minutes is measured and calculated by the following formula.
Z = (150-X) / (150-100) x 100
In the above elongation recovery rate test, the tensile force (N) when the test piece is elongated by 50% is 1.0N to 2.0N, preferably 1.1 to 1.7N in the MD direction, and is in the TD direction. It is 0.2N to 1.0N, preferably 0.3 to 0.9N. When the chemical holding sheet 10 is used as a face mask, it is preferable that the MD direction of the chemical holding sheet is the vertical direction of the face mask and the TD direction of the chemical holding sheet is the horizontal direction of the face mask. This makes it easy to use when the face mask is stretched laterally and attached to the face. On the other hand, in the vertical direction of the face mask, it is more difficult for the face mask to fall off the face after being brought into close contact with the face if it is harder to stretch than in the horizontal direction.

The separator is a film having releasability necessary for the manufacturing process. As a result, the chemical solution holding sheet 10 can be wound up. As the separator, a synthetic resin film having releasability is used, and a polypropylene film is particularly preferable. The thickness of the separator is 10 μm to 150 μm, preferably 20 μm to 120 μm, and particularly preferably 30 μm to 100 μm. Since the surface tone of the separator is transferred to the film, the film can be made matte.

The chemical holding sheet 10 is manufactured, for example, by an extrusion laminating method. Specifically, the non-woven fabric 11 is prepared, and the surface of the non-woven fabric 11 is subjected to corona treatment. A melted elastomer extruded into a film from an extruder such as a die is laminated on the surface of the corona-treated non-woven fabric 11. The die temperature is preferably set to a temperature higher than the melting point of the thermoplastic elastomer and lower than the melting point or decomposition temperature of the fibers of the nonwoven fabric 11. For example, the temperature is 30 ° C to 100 ° C, preferably 50 ° C to 80 ° C higher than the melting point of the thermoplastic elastomer. Then, the laminated sheet of the molten thermoplastic elastomer and the non-woven fabric 11 is pressed, and the molten or softened thermoplastic elastomer is inserted between the fibers of the discharge-treated surface of the corona-treated non-woven fabric 11 to be integrated. For example, the chemical solution holding sheet 10 is produced by pressing and integrating the sheets while sandwiching them between a pair of rolls. Examples of the pair of rolls include a pair of metal rolls, a metal roll and a rubber roll, and a combination of a pair of rubber rolls. In the case of a combination of a metal roll and a rubber roll, the surface of the film 12 can be made uneven by contacting the thermoplastic elastomer with the rubber roll and the non-woven fabric with the metal roll.
When the separator is provided, the melted elastomer is laminated on the surface of the non-woven fabric 11, the separator is laminated on the melted elastomer, and the laminated sheet having a three-layer structure is pressed. In this case, since the film 12 is sandwiched between the non-woven fabric 11 and the separator, any combination of a pair of rolls may be used.
In either case, the metal roll may be niped while being heated by applying heat.
In addition to the extrusion laminating method, the non-woven fabric 11 and the film 12 may be molded, laminated, and then heat-pressed to be integrated.

As described above, in the chemical liquid holding sheet 10, the non-woven fabric 11 and the film 12 are laminated and integrated by the thermoplastic elastomer entering a part between the fibers on the discharge-treated surface of the non-woven fabric 11 which has been discharged-treated. The non-woven fabric and the film can be firmly adhered to each other without impairing the liquid retention property, the touch, and the physical properties of the film. Therefore, it is excellent in elasticity and kickback property. In particular, when used as a face mask, it has an excellent lift-up function, good adhesion to the face, and a flexible tactile sensation as a whole.
Further, since the film 12 is laminated on the non-woven fabric 11, it is possible to prevent the active ingredients such as beauty essence and lotion from evaporating while using the face mask.
Further, since the quality of the chemical solution holding sheet 10 is maintained below the melting point of the thermoplastic elastomer, it can be sterilized by heat treatment, and the degree of freedom in the face mask production process is high.

[Examples 1 and 2]
70% by weight of side-by-side type PET crimped fiber (melting point 220 ° C.) with a fiber diameter of 15 μm and 51 mm fiber length, 30% by weight of rayon fiber (decomposition temperature 280 ° C.) with a fiber diameter of 12 μm and a fiber length of 40 mm, and a grain of 60 g / A non-woven fabric 11 having m ² and a thickness of 0.8 mm was prepared by a needle punching method. The non-woven fabric 11 was subjected to corona treatment under the conditions of high power (2.0 kW) and line speed (20 m / min).
Next, 90% by weight of polyester-based elastomer (Perprene (registered trademark) of Toyobo Co., Ltd., P-30B-30, melting point 160 ° C.) and masterbatch of black pigment (70% by weight of polyethylene, 30% by weight of carbon black) It was kneaded and melted at 10% by weight, extruded from a die (die temperature 200 ° C.) into a film having a thickness of 15 μm, and superposed on the corona-treated surface of the non-woven fabric 11.
Next, a polypropylene film having a thickness of 40 μm was layered on the melted elastomer.
Then, a three-layer sheet of a corona-treated non-woven fabric 11 / black film / separator was pressed while being sandwiched between a pair of rolls to produce a chemical solution holding sheet with a separator. This is referred to as Example 1. Further, a chemical solution holding sheet having a separator under the same conditions as in Example 1 was produced except that a film-like elastomer composition having a thickness of 20 μm was extruded. This is referred to as Example 2. The separator is an auxiliary material required in the manufacturing process, and is not a member required as a chemical solution holding sheet such as a face mask.

[Comparative Example 1]
70% by weight of side-by-side type PET crimped fiber (melting point 220 ° C.) with a fiber diameter of 15 μm and 51 mm fiber length, 30% by weight of rayon fiber (decomposition temperature 280 ° C.) with a fiber diameter of 12 μm and a fiber length of 40 mm, and a grain of 60 g / A non-woven fabric 11 having m ² and a thickness of 0.8 mm was prepared by a needle punching method. Next, 90% by weight of polyester-based elastomer (Perprene (registered trademark), P-30B-30, melting point 160 ° C.) of Toyobo Co., Ltd., and masterbatch of black pigment (70% by weight of polyethylene, 30% by weight of carbon black) 10% by weight was kneaded and melted, extruded from a die (die temperature 200 ° C.) into a film having a thickness of 15 μm, and laminated on the non-woven fabric 11. Then, a polypropylene film having a thickness of 40 μm was laminated on the melted elastomer.
Then, a three-layer sheet of untreated non-woven fabric 11 / black film / separator was pressed while being sandwiched between a pair of rolls to produce a chemical solution holding sheet with a separator. This is referred to as Comparative Example 1.

"Physical property test"
For Examples 1 and 2 and Comparative Example 1, the peel strength (N) between the non-woven fabric and the film was determined, and the results are shown in Table 1.
The peel strength was measured by measuring a sample having a width of 50 mm and a length of 100 mm under the conditions of a peel angle of 180 degrees and a test speed of 200 mm / min in parallel with the MD direction of the film 12. The peel strength was measured with the separator attached.

The peel strength of Comparative Example 1 was about 1N, whereas the peel strength of the chemical holding sheets of Examples 1 and 2 in which the non-woven fabric was corona-treated was 3N or more.

10 Chemical solution holding sheet 11 Non-woven fabric 12 Film 13 Area where thermoplastic elastomer has entered

Claims (5)

A chemical liquid holding sheet in which a non-woven fabric having liquid retention and a film are laminated and integrated.
The film comprises an elastomer composition comprising a thermoplastic elastomer.
At least one surface of the non-woven fabric is a discharge-treated surface.
The melting point of the thermoplastic elastomer of the film is lower than the melting point or decomposition temperature of the fibers of the non-woven fabric.
The non-woven fabric and the film are laminated and integrated by the thermoplastic elastomer entering a part between the fibers of the discharge-treated surface.
Sheet for holding chemicals. The discharge process is a corona process.
The chemical solution holding sheet according to claim 1. The chemical solution was retained in the non-woven fabric,
The chemical solution holding sheet according to claim 1 or 2. A face mask made of the chemical holding sheet according to claim 3. It is a laminate of a liquid-retaining non-woven fabric and a film, and the film is composed of an elastomer composition containing a thermoplastic elastomer, and the thermoplastic elastomer of the film is determined from the melting point or decomposition temperature of the fibers of the non-woven fabric. A method for manufacturing a chemical holding sheet having a low melting point.
At least one surface of the non-woven fabric is discharged to form a discharge-treated surface.
A melted or softened film is laminated on the discharge-treated surface.
By pressing both of them, the thermoplastic elastomer of the film is allowed to enter a part between the fibers of the discharge-treated surface, and the non-woven fabric and the film are laminated and integrated.
A method for manufacturing a chemical holding sheet.

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