JP2987524B2 - Sanitary napkin individual package sheet and individual sanitary napkin package packaged with the individual package sheet - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an individualized sheet for individually packing a sanitary napkin with an adhesive provided with an adhesive layer for fixing to underwear, and the individualized sheet. The present invention relates to an individual sanitary napkin package in which a sanitary napkin with an adhesive is packaged using the above method.

BACKGROUND ART In order to prevent a shift during use of a sanitary napkin (hereinafter, simply referred to as a napkin), a napkin having an adhesive layer formed on a part of its surface is commercially available.

Conventionally, such napkins with an adhesive have been individually packaged one by one with a plastic film or the like after protecting the adhesive layer with a release liner (separator). However, in such a packaging form, there is a problem of waste such as a release liner generated at the time of use and a problem of economic efficiency.In recent years, a napkin with an adhesive has been used in a packaging material having a release function without using a release liner. The form of direct packaging has become mainstream.

Various types of packaging materials have been proposed as packaging materials (hereinafter, referred to as individual packaging sheets) capable of directly packaging a napkin with an adhesive without using a release liner.
For example, JP-A-3-184543 and JP-A-4-284237 disclose that, as a packaging material for a napkin with an adhesive, it can be cured by irradiating one side of a plastic film such as polyethylene with an electron beam or ultraviolet rays. There is disclosed an individual sheet having a silicone release agent layer formed thereon.

However, in the case of an individual sheet in which silicone is cured by ionizing radiation such as an electron beam or ultraviolet rays and a release agent layer is formed, products in which individual napkins are individually packaged using such individual sheets are arranged in stores. The individual packaging sheet gradually peels off when exposed to direct sunlight while the napkin is purchased, or when the consumer who purchased the napkin is left exposed to direct sunlight before using the individually packed napkin. (The interfacial interaction between the release agent layer and the pressure-sensitive adhesive layer becomes stronger), and a problem arises in that the individual packaging sheet becomes difficult to peel off when a napkin is used.

The present invention has been made in view of the above-described problems, and has as its object to expose napkins individually wrapped in individual packaging sheets to sunlight, fluorescent light rays, and the like until use. However, it is an object of the present invention to provide an individualized sheet that can be smoothly peeled from an napkin during use without the individualized sheet being subjected to heavy peeling, and an individual sanitary napkin package using the individualized sheet. .

DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted intensive studies to solve the above problems, and as a result, as a release agent layer of an individual packaging sheet, an epoxy-functional polyorganosiloxane containing a specific amount of a monovalent epoxy-functional organic group. Using a release agent containing as a main component, the release agent is cured by ultraviolet rays to produce an individual sheet,
The present inventors have found that the above problem can be solved by wrapping a napkin with the individual packaging sheet, and have reached the present invention.

That is, the present invention is a sanitary napkin packaging sheet having a release agent layer formed on one surface of a base material, wherein the release agent layer is formed by subjecting a release agent containing an epoxy-functional polyorganosiloxane as a main component to ultraviolet irradiation. Wherein the epoxy-functional polyorganosiloxane comprises 1-20 mol% of all organic groups composed of monovalent epoxy-functional organic groups (claim 1). , 2).

In addition, the present invention provides an individual sanitary napkin package in which a napkin having an adhesive layer for fixing to underwear on the surface is individually wrapped with the above-mentioned individual packaging sheet (Claim 3), and a napkin surface. An individual sanitary napkin package comprising a pressure-sensitive adhesive layer formed on a pressure-sensitive adhesive mainly composed of a polymer having an aliphatic double bond between carbon atoms in a molecule (claim 4). About.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a sanitary napkin individual sheet of the present invention, and FIG. 2 is a schematic view showing an individual sanitary napkin package of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view showing an example of an individual packaging sheet according to the present invention. A release sheet 2 is formed on one surface of a base material 1 to constitute an individual packaging sheet A.

The epoxy-functional polyorganosiloxane, which is a main component of the release agent layer, is in the presence of a cationic photo-curing catalyst described below.
A cationic curing reaction is caused by irradiation with ultraviolet rays, and a release agent layer can be formed.

In the present invention, the epoxy-functional polyorganosiloxane accounts for 1 to 20 mol%, preferably 2 to 15 mol%, of all organic groups (organic groups bonded to the main chain polysiloxane chain).
It is necessary that mole% be monovalent epoxy functional organic groups. When the amount of the monovalent epoxy-functional organic group is less than 1 mol%, the curing speed when irradiating ultraviolet rays is slowed, and the productivity of the individual packaging sheet is remarkably reduced. The adhesive property of the napkin adhesive layer in contact with the adhesive layer.

On the other hand, when the monofunctional epoxy-functional organic group exceeds 20 mol%, when the napkin is packaged in a single sheet using such an epoxy-functional polyorganosiloxane as a release agent, it is exposed to light such as sunlight. Heavy peeling at the time occurs particularly remarkably.

The epoxy-functional polyorganosiloxane used as a release agent for an individual sheet in the present invention is not particularly limited as long as the above conditions are satisfied.
It can be appropriately selected from known epoxy-functional polyorganosiloxanes and used. Examples of such an epoxy-functional polyorganosiloxane include those having a structure represented by the following formula (1).

R ¹ _m R ² _n SiO _{(4-mn) / 2} (1) In the above formula, R ¹ is a hydrogen atom or a monovalent hydrocarbon group, and the monovalent hydrocarbon group is a methyl group, Ethyl group,
Examples thereof include alkyl groups such as propyl group, butyl group, hexyl group and octyl group, aryl groups such as phenyl group and tolyl group, and alkenyl groups such as vinyl group and allyl group. Among them, a methyl group is preferable since good releasability is obtained.

R ² is a hydrogen atom, a divalent hydrocarbon group, a monovalent hydrocarbon group or a monovalent epoxy-functional organic group. Examples of the monovalent hydrocarbon groups include those listed above R ¹ are exemplified.
Examples of the divalent hydrocarbon group include a methylene group, an ethylene group, and a propylene group. On the other hand, monofunctional epoxy functional organic groups include glycidyl group, glycidoxy group,
Examples thereof include a 4-epoxycyclohexyl group and a 2,3-epoxycyclopentyl group.

In the above formula, m and n are integers of 0 to 3, respectively, and m and n are integers of 0 to 3 in total.

Epoxy-functional polyorganosiloxanes include, for example, a base polymer such as polymethyl hydrogen siloxane and an olefinic epoxy monomer such as 4-vinylcyclohexene oxide, allyl glycidyl ether, 7-epoxy-1-octene, and a catalyst such as a platinum compound. To give an addition reaction (hydrosilylation reaction).

Alternatively, the polyorganosiloxane containing at least two alkenyl groups in one molecule may be partially crosslinked with polymethylhydrogensiloxane as a base polymer and then subjected to an addition reaction with the olefinic epoxy monomer. .

Further, epoxy-functional polyorganosiloxanes containing trifunctional siloxane units as described in JP-A-4-159322 can also be used.

In the present invention, the photocationic curing catalyst to be added to the epoxy-functional polyorganosiloxane in order to cure the release agent by irradiation with ultraviolet light, is compatible with the epoxy-functional polyorganosiloxane, and is irradiated with ultraviolet light to cure the epoxy. There is no particular limitation as long as it has the ability to open the ring, and known ones can be used.

Such photo-cationic curing catalysts example, the formula R ³ ₂ I ⁺ M
_{^{X n -, R 3 3 S}} + MX n -, R 3 3 Se + MX n -, R 3 4 P + MX n -, R 3 4 N + MX n - onium salt compounds represented by the like . In the formula, R ³ represents (1) a C _{6 to} C ₂₀ aromatic hydrocarbon group, (2) a C _{1 to} C ₈ alkoxyl group, a C _{1 to} C ₈ alkyl group,
A C ₆ -C ₂₀ aromatic hydrocarbon group substituted with 1-4 monovalent organic groups or atoms selected from a nitrogen atom, a chlorine atom, a bromine atom, a cyano group, a carboxyl group, and a mercapto group (3) The same or different organic groups selected from the group consisting of aromatic heterocyclic groups selected from pyridyl groups, thiophenyl groups, and pyranyl groups.

Also, MX _n ^- is ^{_{BF 4 -, PF 6 -,}} AsF 6 -, SbF 6 -, SbCl 6 -, HS
It is a non-basic and non-nucleophilic anion selected from the group consisting of O ₄ ⁻ , ClO ₄ ⁻ , B (C ₆ F ₅ ) ₄ ^{− and the} like.

In the present invention, for example, diaryliodonium salts such as bis (dodecylphenyl) iodonium hexafluoroantimonate are preferably used.

The amount of the photocationic curing catalyst is not particularly limited, but is usually 0.3 to 10 parts by weight, preferably 0.5 part by weight, based on 100 parts by weight of the epoxy-functional polyorganosiloxane.
~ 6.0 parts by weight.

If the amount of the photocationic curing catalyst is less than 0.3 parts by weight, the reactivity (curing) of the epoxy-functional polyorganosiloxane is undesirably reduced. Further, if the amount of the photocationic curing catalyst is more than 10 parts by weight, the effect for improving the reaction (curing) property becomes small, which is not economically preferable.

A known additive component is added to the release agent based on the epoxy-functional polyorganosiloxane of the present invention as necessary to improve the compatibility between the epoxy-functional polyorganosiloxane and the photocationic curing catalyst, For example, the release characteristics of the release agent layer can be controlled. Examples of such additive components include polyether compounds described in JP-A-4-126767, alkylphenols having 8 to 16 carbon atoms described in JP-A-3-115425,
Examples include phenolalkyl-substituted organodisiloxanes, α-methylstyrene-based compounds and p-substituted styrene compounds described in JP-A-4-11678.

The type of base material used for the individual packaging sheet is not particularly limited, and may be a polyolefin-based plastic film such as polyethylene or polypropylene, a plastic film such as polyester, nylon, or cellophane, or a high-quality paper, clupak paper, glassine paper, or the like. Paper, and a laminated base material obtained by laminating a plastic film on a nonwoven fabric can be appropriately selected and used.

Above all, a polyethylene film is preferably used because of its flexibility and good texture when touched.

The surface of the substrate can be subjected to corona discharge treatment, embossing, or printing as required.

The individual package sheet of the present invention is produced by applying a release agent containing the above-mentioned epoxy-functional polyorganosiloxane as a main component to the surface of a base material, and then irradiating ultraviolet rays.

As a method of applying a release agent to the substrate, for example, direct gravure coater, offset gravure coater,
A known coating device such as a roll coater, a bar coater, and a die coater can be appropriately selected and used.

The form of application of the release agent layer formed on the base material surface is not limited at all, and for example, the release agent may be applied only to the entire surface of one side of the base material or the release agent may be applied only to the portion that comes into contact with the adhesive layer provided on the napkin. Can be applied.

The coating amount of the release agent layer is not particularly limited, but is usually 0.1 to 5
g / m ^2, preferably 0.1-2 g / m ^2. 0.1 g / m ² coating amount
If the amount is less than the above range, it is difficult to uniformly coat the surface of the base material, and uneven coating (pinhole) is likely to occur. Further, if the coating amount is more than 5 g / m ² , the change in the releasability is small, which is not economically preferable.

As a method of irradiating ultraviolet rays after applying a release agent on the surface of the base material, for example, a known ultraviolet lamp such as a high pressure mercury lamp with electrodes, a metal halide lamp, or a microwave lamp without electrodes may be appropriately selected and used. Can be.

FIG. 2 is a schematic view showing an example of an individual napkin package of the present invention, in which a napkin B having an adhesive layer 3 is individually wrapped with an individual sheet A of the present invention. At this time, the individual packaging sheet A is packaged with the release agent layer 2 inside and in contact with the adhesive layer of the napkin.

In the present invention, the type of napkin used for the individual napkin package is not limited at all, and any napkin conventionally used can be used.

The type of the pressure-sensitive adhesive layer formed on the napkin surface is not limited at all, and any known pressure-sensitive adhesive such as a rubber-based pressure-sensitive adhesive or an acrylic-based pressure-sensitive adhesive can be used.

In particular, in the present invention, a particularly remarkable effect is obtained when the pressure-sensitive adhesive layer formed on the napkin surface is composed of a pressure-sensitive adhesive containing a polymer having an aliphatic double bond between carbon atoms in the molecule as a main component ( (Even if the individual napkin package is exposed to sunlight or the like, the individual packaging sheet does not undergo heavy peeling.) This is because, when the polymer that is the main component of the adhesive contains an aliphatic double bond between carbon atoms in the molecule, the adhesive is irradiated with light such as sunlight to reduce the fat content in the molecule. The group double bond is cleaved to generate radicals, and the radicals react with the release agent of the individual packaging sheet in contact with the pressure-sensitive adhesive layer to increase the interaction at the pressure-sensitive adhesive layer / release agent layer interface. I guess there is.

Here, as an adhesive mainly containing a polymer having an aliphatic double bond between carbon atoms in the molecule, for example, a natural rubber-based adhesive mainly containing natural rubber, styrene-butadiene rubber, isoprene rubber, butyl rubber Synthetic rubber-based pressure-sensitive adhesives whose main component is synthetic rubber, such as styrene-isoprene block copolymer (SIS), and hot-melt type adhesives whose main component is a block polymer such as styrene-butadiene block copolymer (SBS) Agents and the like.

Also, a polymer obtained by subjecting a block polymer such as a styrene-isoprene block copolymer or a styrene-butadiene block copolymer to a hydrogenation treatment is not completely hydrogenated due to its production method, and an aliphatic divinyl alcohol is partially formed in the molecule. The case where a heavy bond remains is included in the polymer having an aliphatic double bond between carbon atoms in the molecule in the present invention.
Such polymers include, for example, styrene-ethylene-, in which all aliphatic double bonds in the molecule are not hydrogenated.
Butylene block copolymer (SEBS) and the like.

As the pressure-sensitive adhesive layer formed on the napkin surface, in addition to using a pressure-sensitive adhesive mainly containing a polymer having an aliphatic double bond between carbon atoms in the molecule described above, for example,
An acrylic pressure-sensitive adhesive obtained by crosslinking a polymer mainly containing a (meth) acrylate such as butyl (meth) acrylate or 2-ethylhexyl (meth) acrylate with a known crosslinking agent can also be used.

If necessary, known additives such as a tackifier, an antioxidant, a pigment and a filler can be added to the pressure-sensitive adhesive.

〔Example〕

Hereinafter, the present invention will be described with reference to specific examples, but the present invention is not limited to these examples.

(Example 1) 100 parts by weight of an epoxy-functional polydimethylsiloxane (viscosity at 25 ° C of 350 cP) obtained by adding 6 mol% of 4-vinylcyclohexene oxide to one side of a 25 μm-thick polyethylene film based on all methyl groups. Was prepared by adding 1 part by weight of bis (dodecylphenyl) iodonium hexafluoroantimonate, and applying a release agent under the following conditions and irradiating with ultraviolet rays to produce an individual package sheet of the present invention.

Adhesive tape (50 mm wide, 50 mm long) coated with a hot melt type adhesive made of styrene-isoprene block copolymer on one side of a polypropylene / polyethylene blend film (weight ratio: 6/4, thickness 95 μm) at a thickness of 45 μm 150mm)
Was prepared, and a release agent layer of the individual sheet was adhered to the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape to prepare a sample for evaluating a release force.

Release agent coating conditions, coating apparatus: offset gravure coater Coating amount: 1 g / m ² · Line Speed: 20 m / min Ultraviolet light: FUSION Co., F-450 (H bulb) Ultraviolet light amount: 120 W / cm Example 2 100 parts by weight of an epoxy-functional polydimethylsiloxane (viscosity at 25 ° C .: 400 cP) to which 5 mol% of 4-vinylcyclohexene oxide was added to all methyl groups as a release agent for an individually packaged sheet. A sample for evaluating peeling force was prepared in the same manner as in Example 1 except that 1 part by weight of bis (dodecylphenyl) iodonium hexafluoroantimonate was used.

Example 3 100 parts by weight of an epoxy-functional polydimethylsiloxane (viscosity at 25 ° C .: 400 cP) to which 3 mol% of 4-vinylcyclohexene oxide has been added to all methyl groups as a release agent for an individually packaged sheet A sample for evaluating peeling force was prepared in the same manner as in Example 1 except that 1 part by weight of bis (dodecylphenyl) iodonium hexafluoroantimonate was used.

(Example 4) 100 parts by weight of an epoxy-functional polydimethylsiloxane (viscosity at 25 ° C is 300 cP) to which 10 mol% of 4-vinylcyclohexene oxide is added as a release agent for an individually packaged sheet based on all methyl groups. And an individual sheet was prepared in the same manner as in Example 1 except that one prepared by adding 1 part by weight of bis (dodecylphenyl) iodonium hexafluoroantimonate was used.

A hot-melt pressure-sensitive adhesive composed of a hydrogenated styrene-butadiene copolymer was applied to one side of a polypropylene / polyethylene blend film (weight ratio: 6/4, thickness 95 μm) to a thickness of 45 μm.
An adhesive tape (width: 50 mm, length: 150 mm) coated at μm was prepared, and a release agent layer of the individual sheet was bonded to the adhesive layer of the adhesive tape to prepare a sample for evaluating a peeling force.

(Example 5) A pressure-sensitive adhesive tape (trade name: No.31B, manufactured by Nitto Denko Corporation) in which an acrylic pressure-sensitive adhesive was applied to one surface of a polyester film was cut into a width of 50 mm and a length of 150 mm, and the cut was performed on the pressure-sensitive adhesive layer. An individual sheet similar to that in Example 1 was attached to prepare a sample for evaluating a peeling force.

(Example 6) An individual sheet similar to that of Example 2 was adhered to the adhesive layer of the adhesive tape similar to that of Example 5 to prepare a sample for peel force evaluation.

(Example 7) A sample for evaluating a peeling force was prepared by attaching an individual sheet similar to that of Example 3 to an adhesive layer of an adhesive tape similar to that of Example 5.

(Example 8) An individual sheet similar to that of Example 4 was attached to the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape of Example 5 to prepare a sample for peel force evaluation.

(Example 9) An individualized sheet was produced in the same manner as in Example 1 except that the base material of the individualized sheet was changed to a polyethylene film having a thickness of 30 µm.

Remove the packaging material of a commercially available napkin with adhesive (the adhesive layer for fixing to the underwear is provided on the body of the napkin) and the release paper protecting the adhesive layer, and remove the adhesive of the napkin. The package was packaged so that the release agent layer of the above-mentioned individual package sheet was in contact with the layer, and an individual napkin package was produced.

(Example 10) An individualized sheet was produced in the same manner as in Example 2 except that the base material of the individualized sheet was changed to a polyethylene film having a thickness of 30 µm.

An individual napkin package was prepared by packing the same napkin with an adhesive as in Example 9 so that the release agent layer of the individual package sheet was in contact with the adhesive layer of the napkin with the adhesive.

(Comparative Example 1) 100 parts by weight of an epoxy-functional polydimethylsiloxane (viscosity at 25 ° C of 500 cP) to which 30 mol% of 4-vinylcyclohexene oxide was added to all methyl groups as a release agent for an individually packaged sheet. A sample for evaluating peeling force was prepared in the same manner as in Example 1 except that 1 part by weight of bis (dodecylphenyl) iodonium hexafluoroantimonate was used.

(Comparative Example 2) Polyorganosiloxane RC-726 / RC- having an acrylate group on one surface of a polyethylene film having a thickness of 25 µm.
711 (7/3 by weight) [Goldschmidt] 100 parts by weight of acetophenone-based photoinitiator Darocure 1173 [Ciba-Geigy] 2 parts by weight was added and the release agent prepared and applied under the following conditions and UV irradiation An individualized sheet was produced.

Release agent coating conditions, coating apparatus: offset gravure coater Coating amount: 1 g / m ² · Line Speed: 20 m / min Ultraviolet light: FUSION Co., F-450 (H bulb) Ultraviolet light amount: 120 W / cm・ The atmosphere of the ultraviolet irradiation part is set to 50
Adjusted to less than ppm.

A release force evaluation sample was prepared by laminating the release agent layer of the individual sheet to the pressure-sensitive adhesive layer of the same pressure-sensitive adhesive tape as in Example 1.

(Comparative Example 3) Polyorganosiloxane having an acrylate group on one side of a 25 μm-thick polyethylene film RC-726 / RC-
711 (weight ratio 7/3) [manufactured by Goldschmidt] was coated and irradiated with an electron beam under the following conditions to prepare an individualized sheet.

Release agent coating conditions ・ Coating device: Offset gravure coater ・ Coating amount: 1g / m ²・ Line speed: 20m / min ・ Electron beam irradiation device: ESI, CB-150 ELECTROCURTAIN ・ Electron beam dose: 3Mrad A release force evaluation sample was prepared by laminating the release layer of the individual packaging sheet to the pressure-sensitive adhesive layer of the same pressure-sensitive adhesive tape as in Example 1.

(Comparative Example 4) A sample for peeling force evaluation was produced by attaching the same individual sheet as in Comparative Example 1 to the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape as in Example 5.

(Comparative Example 5) A sample for evaluating a peeling force was prepared by attaching an individual sheet similar to that of Comparative Example 2 to an adhesive layer of an adhesive tape similar to that of Example 5.

(Comparative Example 6) An individual sheet similar to Comparative Example 3 was attached to the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape similar to Example 5 to prepare a sample for peel force evaluation.

(Comparative Example 7) An individualized sheet was produced in the same manner as in Comparative Example 1, except that the base material of the individualized sheet was changed to a polyethylene film having a thickness of 30 µm.

An individual napkin package was prepared by packing the same napkin with an adhesive as in Example 9 so that the release agent layer of the individual package sheet was in contact with the adhesive layer of the napkin with the adhesive.

(Comparative Example 8) An individualized sheet was produced in the same manner as in Comparative Example 2 except that the base material of the individualized sheet was changed to a polyethylene film having a thickness of 30 µm.

An individual napkin package was prepared by packing the same napkin with an adhesive as in Example 9 so that the release agent layer of the individual package sheet was in contact with the adhesive layer of the napkin with the adhesive.

(Comparative Example 9) An individualized sheet was produced in the same manner as in Comparative Example 3 except that the base material of the individualized sheet was changed to a polyethylene film having a thickness of 30 µm.

An individual napkin package was prepared by packing the same napkin with an adhesive as in Example 9 so that the release agent layer of the individual package sheet was in contact with the adhesive layer of the napkin with the adhesive.

[Evaluation]

The peeling force evaluation samples (having a width of 25 mm) obtained in Examples 1 to 8 and Comparative Examples 1 to 6 were allowed to stand under the following conditions, and the peeling force after the standing was measured. The peeling force was determined by using a tensile tester and measuring the force required to peel the individual package sheet from the pressure-sensitive adhesive layer of the sample for peeling force evaluation at an angle of 180 °. At this time, the measurement was performed at a tensile speed of a tensile tester of 300 mm / min.

[Condition 1] The peeling force evaluation sample was left outdoors for three days on a sunny day. At this time, the individual packaging sheet was placed on the front side, and the individual packaging sheet was placed so as to be directly exposed to sunlight.

[Condition 2] Using a conveyor-type ultraviolet irradiation apparatus, the sample for peeling force evaluation was irradiated with ultraviolet rays from the individual sheet side under the following conditions.

UV irradiation conditions-Light source: metal halide lamp (light intensity 80 W / cm)-Conveyor speed: 5 m / min (irradiation distance 145 mm)-Number of irradiations: 10 [blank] The peeling force evaluation sample was left in a dark place at room temperature for 3 days. .

 Table 1 shows the measurement results of the peeling force.

The individual napkin packages obtained in Examples 9 to 10 and Comparative Examples 7 to 9 were left under the same conditions as above (condition 1, condition 2, blank), and after standing, the individual packaging sheet was manually peeled off from the napkin. At the time of peeling was evaluated. At this time, when the individual packaging sheet was easily peeled off from the adhesive layer of the napkin,
The case where the film was slightly difficult to peel was evaluated as Δ, and the case where the film was very hard to peel was evaluated as x.

 Table 2 shows the evaluation results of the releasability.

The individual package sheet of the present invention and the individual package of the napkin with an adhesive individually packaged with the individual package sheet can be individually packaged even when exposed to direct sunlight or under accelerated conditions in which ultraviolet rays are forcibly irradiated. It can be seen that the tendency of the sheet to undergo heavy peeling (peeling force increase) is smaller than that of the comparative example.

When the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is a hot-melt pressure-sensitive adhesive made of a styrene-isoprene copolymer (an example of a type having an aliphatic double bond between carbon atoms in a molecule), a comparison is made. It can be seen that the tendency of heavy peeling (peeling force increasing property) is particularly small as compared with the example.

INDUSTRIAL APPLICABILITY The sanitary napkin individual sheet of the present invention has the above-described configuration, and thus the individual wrapper individually wrapped with the adhesive napkin using such an individual sheet is exposed to direct sunlight. Even when left in such an environment, it is possible to prevent the peeling force of the individual packaging sheet protecting the pressure-sensitive adhesive layer from increasing.

Furthermore, the adhesive layer formed on the napkin surface,
When composed of a pressure-sensitive adhesive whose main component is a polymer having an aliphatic double bond between carbon atoms in a molecule, an individual package is formed by combining with the individual package of the present invention to form an individual package. Heavy separation can be particularly effectively prevented.

Therefore, by using the sanitary napkin individual packaging sheet of the present invention and the napkin individual package using the individual packaging sheet, it is possible to solve the conventional problem that the individual packaging sheet is hard to peel off when using the napkin. It is possible to exhibit an excellent effect in stabilizing product quality.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takuya Niino 1-2-1, Shimohozumi, Ibaraki-shi, Osaka Nitto Denko Corporation (58) Field surveyed (Int.Cl. ⁶ , DB name) A61F 13 / 15 B65D 65/40

Claims (4)

(57) [Claims] 1. A sanitary napkin packaging sheet having a release agent layer formed on one surface of a substrate, wherein the release agent layer is formed by subjecting a release agent mainly composed of an epoxy-functional polyorganosiloxane to ultraviolet irradiation. And the epoxy-functional polyorganosiloxane has one of all organic groups.
A sanitary napkin packaging sheet, characterized in that about 20 mol% is composed of a monovalent epoxy-functional organic group. 2. The sanitary napkin packaging sheet according to claim 1, wherein the epoxy-functional polyorganosiloxane constituting the release agent layer comprises a structural unit represented by the following formula (1). R ¹ _m R ² _n SiO _{(4-mn) / 2} (1) (wherein, R ¹ is a hydrogen atom or a monovalent hydrocarbon group, R ² is a hydrogen atom, a divalent hydrocarbon group, 1 A monovalent hydrocarbon group or a monovalent epoxy-functional organic group, m and n are each an integer of 0 to 3, and m and n are an integer of 0 to 3 in total.) 3. An individual sanitary napkin package comprising a sanitary napkin having a pressure-sensitive adhesive layer on a surface thereof, packaged with an individual sheet according to claim 1 or 2. 4. The pressure-sensitive adhesive according to claim 3, wherein the pressure-sensitive adhesive layer is composed of a pressure-sensitive adhesive mainly composed of a polymer having an aliphatic double bond between carbon atoms in the molecule. Sanitary napkin individual package.