JP3520247B2 - Structure of peeling part of disposable absorbent article and disposable absorbent article - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention has reduced peeling noise.
Structure of peeling part of disposable absorbent article and use thereof
It is an object of the present invention to provide a peeling part which is mainly used for a peeling part of an adhesive tape for a disposable diaper and which is used for a disposable absorbent article and which adheres a fastener tape to the back surface of a reinforcing film and a release tape in a peelable manner. Further, it is also suitably used as the structure of the peeling portion used in other disposable absorbent articles such as sanitary napkins .

[0002]

2. Description of the Related Art Generally, a diaper tape, for example, the structure of a peeling portion of a diaper to which a fastener tape is fixed, requires that the fastener tape is not easily detached when the diaper is attached, in order to prevent leakage and displacement. On the other hand, in order to easily attach and detach the diaper, it is necessary for the fastener tape to be easily peeled off from the diaper.

Therefore, conventionally, in the fastener portion of the diaper, an adhesive agent which can easily obtain high adhesion is used as an adhesive agent of the fastener tape, or a reinforcing film is provided on the front portion of the diaper in order to facilitate peeling. A long-chain alkyl-based release treating agent having a high holding property was provided on the surface of the reinforcing film so that the tape would not come off when the fastener tape was fixed.

This long-chain alkyl-based release treating agent exerts an advantage as an excellent release treating agent for meeting the above-mentioned demands, however, on the other hand, when the mother tries to peel the fastener tape from the reinforcing film, "burr" There was a drawback that it peeled off with a loud noise. Such a peeling sound is a problem such as waking up a sleeping baby or waking up a sleeping person, and there has been a demand for its improvement.

On the other hand, when a silicone-based release treating agent, which is generally used as a release treating agent for adhesive tapes and the like, is used, such a noise is not generated during release. However, when a silicone-based release treatment agent is used, the shear adhesive strength with the adhesive layer of the tape is extremely reduced.
When used as a fastener part of a diaper, it has a drawback that the tape tends to come off, and it is currently rarely used for such fixing applications.

[0006]

DISCLOSURE OF THE INVENTION The present inventors previously filed Japanese Patent Application No. 2-278025 (filed on October 16, 1990).
As proposed in 1., the above silicone-based release treating agent contained a three-dimensional organopolysiloxane and was subjected to heavy release to achieve both sound deadening and high retention. However, in this method, the purging of the high-retention property of the current long-chain alkyl-based release treating agent together with the sound deadening effect leads to the progress of heavy release (Ikii, focusing only on the back-side release force of the silicone type, and as a result, There is no choice but to maintain a high level of peeling force), and the peeling force region where noise-sensitive peeling is possible is narrowed,
For example, there has been a problem that a sufficient peeling effect cannot be obtained with a high peeling force of 500 g / 25 mm.

[0007]

In view of the above-mentioned problems, the present inventor has conducted a study to further improve the conventional soundproofing / releasing property. As a result, a pressure-sensitive adhesive composition having a specific low elastic modulus as a pressure-sensitive adhesive layer. The inventors have found that the object can be achieved in the structure of the peeling portion constituted by the combination of the pressure-sensitive adhesive layer and the peeling treatment layer by selecting the material, and have completed the present invention.

That is, according to the present invention, in the structure of the peeling portion of the disposable absorbent article , the boundary surface of which comprises a pressure sensitive adhesive layer and a peeling treatment layer, the adhesive layer is ABA type or A type.
A rubber-based pressure-sensitive adhesive composition mainly composed of a B-type block copolymer (A is a thermoplastic block, B is a rubber block), and has a 100% modulus of 1.5 kg / cm ² measured by a tensile test under the following conditions. Ri der below, the release treatment layer, sheet
Structure of the release portion of recone system or long-chain alkyl release treatment layer der Rukoto disposable absorbent article, wherein, and it
Disclosed is a disposable absorbent article .

In the present invention, by adopting a pressure-sensitive adhesive composition having a specific low elastic modulus as the pressure-sensitive adhesive layer, the peeling force is increased, and as a result, the peeling chart pattern can be made smoother (aging). It is estimated that there is almost no difference between the Max value and the Min value of the peeling force due to the change), which reduces the vibration of the tape and reduces the peeling noise.

Here, the specific low elastic modulus means that the 100% modulus measured by the tensile test under the above conditions is 1.5 kg / cm.
² Below, it is preferably 0.1 to 0.5 kg / cm ² . 1
If the 00% modulus exceeds these values, the elastic modulus of the pressure-sensitive adhesive increases, and the peeling chart pattern is M when peeled.
It is not preferable because a sound is produced by alternately repeating the ax value and the Min value. On the other hand, if the elastic modulus is too low, the shear adhesive strength becomes low and the tape easily peels off, which is not preferable in practice.

The rubber pressure-sensitive adhesive layer used in the present invention is
Have a specific modulus at 100% of the above, etc., especially in terms of pollution-free by hot melt coating, ABA type or A
B type block copolymer (A is a thermoplastic block, B is a rubber block, for example, styrene-isoprene-styrene copolymer, styrene-butadiene-styrene copolymer, styrene-ethylene-butadiene-styrene copolymer, A rubber-based pressure-sensitive adhesive composition mainly composed of a styrene-butadiene copolymer or a hydrogenated product thereof is used.
Be done.

[0012]

By coating the above-mentioned pressure-sensitive adhesive composition on, for example, a tape support, a pressure-sensitive adhesive layer in the structure of the peeling portion of the present invention or a pressure-sensitive adhesive tape having the pressure-sensitive adhesive layer is constituted. It

The thickness of the pressure-sensitive adhesive layer is not particularly limited, but usually 20 to 100 μm is suitable.

The peeling treatment layer constituting the peeling portion in the present invention is
A layer formed of a silicone-based or long-chain alkyl-based release treatment agent . As such a silicone-based release treatment agent,
A commonly used silicone-based release treatment agent mainly composed of dimethylpolysiloxane can be used. In the present invention, it is particularly preferable that the above silicone-based release treating agent contains a three-dimensional organopolysiloxane, as proposed in Japanese Patent Application No. 278025. Further, as the long-chain alkyl release agent, for example, BP type manufactured by Nitto Denko Corporation, Ashiorange manufactured by Asio Sangyo Co., Ltd., Pyroyl manufactured by Tessha Yushi Co., Ltd., or the like can be used.

The coating amount of the above-mentioned release treating agent is usually 0.01 to 10 g / m ² , and preferably 0.1 to 3 in the case of silicone type.
It is g / m ² . In the case of long chain alkyl type, 0.005 to 1
0 g / m ² , preferably 0.02 to 0.3 g / m ² ,
When the pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive composition, it is necessary to slightly reduce the coating amount to achieve heavy peeling and satisfy the holding property, and the coating amount is 0.01 to 0.1 g /
m ² is preferred.

On the other hand, the above-mentioned release treatment agent can be applied not only to the back surface of the release tape of the paper diaper or the back surface of the reinforcing film, but also to the surface of the back sheet of the paper diaper for use.

The film or tape as the base material is not limited in any way. For example, it is made of polypropylene-containing plastic described in JP-A-63-112704, a laminate of polypropylene and polypropylene-containing plastic, or polyester. It is preferable that the surface is flat or matte. Furthermore, a foam or a base material having an uneven surface can also be used. It is also preferable that the base material is a film containing an olefin-based, styrene-based, urethane-based, or polyester-based elastomer as a main component to exhibit good slip properties and is soft.

The above-mentioned film or tape is preferably subjected to a surface treatment such as a corona treatment in advance in order to prevent the release treatment agent applied to the surface thereof from falling off, and at least a surface tension of 38 dyne / cm is used as an index of treatment strength. ² or more is preferable.

An application example using the structure of the peeling portion of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an explanatory view showing each part of the disposable diaper A, in which B is a back sheet, C is a top sheet of a belt portion, D is a reinforcing film, E is a release tape, and F is a fastener tape.

FIG. 2 shows a structural example in which the structure of the peeling portion of the present invention is used for joining the reinforcing film D on the back sheet B of the diaper A and the fastener tape F. On the back sheet B, the film 1 having the above-described release treatment layer 2 applied on the surface thereof is joined by the adhesive 3. on the other hand,
On the peeling treatment layer 2 of the reinforcing film D, the ABA type or AB type block copolymer (A is heat
Rubber mainly composed of plastic block and B is rubber block)
Fastener tape F having a pressure-sensitive adhesive layer 4 made of the system pressure-sensitive adhesive composition is releasably adhered and fixed through the layer 4, the peeling section of the present invention is composed of the interface between the layer 2 and layer 4 ing. Incidentally, instead of the above-mentioned constitution, the release treatment layer 2 is formed on the surface.
The film 1 having the above may be directly heat-bonded onto the back sheet B, or the release treatment agent used in the present invention may be directly applied onto the back sheet B of the disposable diaper A.

FIG. 3 shows an example in which the fixing structure of the present invention is applied to a sanitary napkin. A pressure-sensitive adhesive layer 4 made of a pressure-sensitive adhesive composition is provided on the inner surface on one end side of the napkin N, and a release treatment layer 2 made of the release treatment agent is applied on the inner surface on the other end side. The napkin N is folded so that the pressure-sensitive adhesive layer 4 abuts on the upper surface of the layer 2, and the boundary portion between the layer 2 and the layer 4 constitutes the peeling portion of the present invention.

[0023]

[0024]

[0025]

EXAMPLES The present invention will be described in detail below with reference to examples. In the text, "%" means% by weight, and "part" means part by weight. [Creation of adherend (reinforcing film)] Polyester (PE
T) On a film (thickness: 12 μm), as a silicone-based release treatment agent, a three-dimensional organopolyene was added to a toluene solution (solid content: 30%) of an addition type silicone resin (X-62-2378 manufactured by Shin-Etsu Chemical Co., Ltd.). Siloxane (X, manufactured by Shin-Etsu Chemical Co., Ltd.
-92-140) toluene / xylene solution (solid content 30%)
Was mixed to give a three-dimensional organopolysiloxane content of 30%, and the solution was applied at 0.38 g / m ² and then heat-treated at 120 ° C. for 1 minute to form a release-treated layer. The adherend 1 was obtained.

On a oriented polypropylene (OPP) film (thickness: 25 μm), a 2% toluene solution of a long-chain alkyl release agent (Peiroyl 1010, manufactured by Onosha Oil and Fat Co., Ltd.) becomes 0.02 g / m 2. So that 80 ° C
The adherend 2 on which the release treatment layer was formed by heat treatment for 1 minute was obtained.

[Preparation of Adhesive Tape (Fastener Tape)] A pressure-sensitive adhesive layer was formed by coating each of the following adhesive compositions in a thickness of 50 μm on one surface of a low-density polyethylene film having a thickness of 120 μm. , The adhesive tape was obtained.
Here, in Example 1 and Comparative Example 1, toluene 4 was used.
Coating on a 0% basis, in Example 2 and Comparative Example 2,
In hot melt coating, Example 3 and Comparative Example 3,
It was coated on the basis of 50% toluene.

[0028]   [Composition of adhesive] Example 1     Natural rubber (manufactured by Kasho Co., Ltd., SMR) 100 parts     Petroleum resin (Nippon Zeon Co., Ltd., Kraton D-100) 150 parts     Softener (Nippon Oil Co., Ltd., PolyBran HV-300) 50 parts     Antiaging agent (Ciba Geigy Co., Ltd., Irganox 1010) 2 parts

[0029] Comparative Example 1     Natural rubber (manufactured by Kasho Co., Ltd., SMR) 100 parts     50 parts of petroleum resin (Nippon Zeon Co., Ltd., Kraton D-100)     Antiaging agent (Ciba Geigy Co., Ltd., Irganox 1010) 2 parts

[0030] Example 2     Synthetic rubber SIS (Shell, 1107) 100 parts     Petroleum-based resin (manufactured by Exxon, Esmarets 5300) 60 parts     Softener (paraffin oil) 20 parts     Antiaging agent (Ciba Geigy Co., Ltd., Irganox 1010) 2 parts

[0031] Comparative example 2     Synthetic Rubber SIS (Nippon Synthetic Rubber Co., Ltd., JSR-5500) 100 parts     Petroleum resin (Nippon Synthetic Rubber Co., Ltd., Kraton N-180) 150 parts     Softener (paraffin oil) 50 parts     Antiaging agent (Ciba Geigy Co., Ltd., Irganox 1010) 2 parts

[0032] Example 3     Of 2 ethylhexyl acrylate and acrylic acid     Copolymer (weight ratio 100: 2) 100 parts     1 part of isocyanate-based cross-linking agent (Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.)

[0033] Comparative Example 3     2 Ethylhexyl acrylate and ethyl acrylate     Copolymer with acrylic acid (weight ratio 100: 40: 3) 100 parts     2 parts of isocyanate cross-linking agent (Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.)

The 100% modulus of these adhesives
The measurement was performed by the following method, and the results are shown in Table 1.

Further, the sample piece of the above-mentioned pressure-sensitive adhesive tape was attached to the release treatment layer of the adherends 1 and 2 to obtain the structure of the release portion of the present invention. Then, an adhesive force test (peeling force and holding force), a sound pressure level measurement at the time of peeling, and a monitor test actually attached to a paper diaper were conducted for each of them, and the results are shown in Table 1. Each test method is as described below.

[0036]

[Table 1]

The [100% modulus] sample is 50-
The thickness was 200 ± 10 μm, the cross-sectional area was 1 mm ² (adjusted by the width depending on the thickness), the gripping interval was 10 mm, and the measurement temperature was 20 ° C. and the pulling speed was 50 mm / min.

[Peeling force] 2 kg on the surface of the peeling treatment layer of the sample piece on the side of each peeling treatment layer fixed on the stainless steel plate
The sample piece on the pressure-sensitive adhesive tape side was attached by reciprocating the roller once, and the 180 ° peeling adhesive force was measured at 300 mm / min within 3 minutes after the attachment.

[Holding force] The sample prepared by the above peeling force test was held in the vertical direction, and the time (minutes) until the sample piece on the adhesive tape side dropped when hung with a load of 0.5 kg was measured. . The goal was 30 minutes or more.

[Measurement Method of Sound Pressure Level] As a sample,
The adherend was attached to a commercially available paper diaper, and the pressure-sensitive adhesive tape of the present invention was pressure-bonded to the diaper by reciprocating a 700 g roller once. Within 3 minutes after crimping, peel off this adhesive tape from 10 ~
The peeling noise at the initial peeling was measured using an integral precision sound level meter at 50 m / min and a measuring distance of 100 mm. In addition, when the decibel of the surrounding blank at that time was measured, it was confirmed to be 50 dB.

[Monitor Test] Each of the above sample pieces was actually attached to the fastener part of a paper diaper, and a monitor test of 20 people was conducted on the ease of peeling, the difficulty of coming off, and the quietness of noise during peeling. The results were evaluated as follows. Seventeen to twenty were good. ○ 13 to 16 people made it good. ○ to △ 9 to 12 people made it good. Δ 5 to 8 people made it good. × 4 or less were considered good. × ×

[0042]

As described above, the structure of the peeling portion of the present invention is characterized in that the member such as the tape is not easily detached at the time of fixing, but at the time of peeling, it can be easily peeled without making a noise. Therefore, it is useful as a structure of a peeling part of a disposable absorbent article for the purpose of forming a peeling part such as a disposable diaper or for other peeling fixation, and also as a structure of a peeling part of medical tapes, packaging tapes, daily necessities, etc. Is.

In particular, the structure of the present invention for fixing a paper diaper that does not make noise or can be released with sound deadening has an increased prevalence of paper diapers, has a large daily usage amount, and is used at a high frequency in the middle of the night. It is of great practical value as it responds to consumer demand.

According to the present invention, the sound pressure level can be measured to be at least 10 dB or less, preferably 35 dB or less than the sound pressure of the surrounding blank. For example, when the ambient sound pressure level blank is 50 dB, it can be 60 dB or less, preferably 85 dB or less.

Although the present invention has been described above mainly for the case of using as the structure of the peeling portion of the diaper, the present invention can be used as the structure of the peeling portion of other disposable absorbent articles such as sanitary napkins, and also for medical use. The structure of the peeling part using the tape is suitable for use in the hospital at midnight without disturbing the sleep of other patients, and the structure of the peeling part of corrugated cardboard, etc. using the packaging tape that is often used in quantity. Also, it is useful as the structure of the peeling portion in various other lifestyle-related products, because the peeling noise is reduced. Further, generally, even in a tape in a roll state, a peeling portion is formed between the tape winding layers, but if the structure of the peeling portion of the present invention is applied to this, peeling noise at the time of rewinding of the tape is reduced, so at the workplace It is also effective in improving the environment caused by the peeling noise.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a disposable diaper.

FIG. 2 is a cross-sectional explanatory view showing an example of the present invention in a fastener portion of a disposable diaper.

FIG. 3 is an explanatory diagram showing another application example of the present invention.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI C09J 153/02 // A61F 5/44 (58) Fields investigated (Int.Cl. ⁷ , DB name) C09J 7/02 A61F 13 / 15 A61F 13/472 A61F 13/49 A61F 13/58 C09J 153/02 A61F 5/44

Claims (4)

(57) [Claims] 1. A structure of a peeling part of a disposable absorbent article, the boundary surface of which comprises a pressure-sensitive adhesive layer and a peeling treatment layer, wherein the adhesive layer is an ABA type or AB type block. Copolymer (A is a thermoplastic block, B is a rubber block)
Is a rubber-based pressure-sensitive adhesive composition mainly composed of 100% modulus measured by a tensile test under the following conditions: 1.5 kg / cm
² below der is, the release treatment layer, silicone-based or long
Use and wherein chain alkyl-based release treatment layer der Rukoto disposable
The structure of the peeling part of the absorbent article . 2. The structure of the peeling portion of the disposable absorbent article according to claim 1, wherein the surface on which the pressure sensitive adhesive layer and the peeling treatment layer are formed is a constituent member of a paper diaper or a sanitary napkin. 3. The peeling part of the disposable absorbent article according to claim 1.
A disposable absorbent article having the following structure. 4. Used as a disposable diaper or a sanitary napkin.
The disposable absorbent article according to claim 3, which is provided.