JP2001146579A - Structure of releasing portion and pressure-sensitive adhesive tape using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a releasing portion useful in fixing, e.g. a diaper whose member such as a tape is hard to come off upon fixing but easily releasable without generating a sound upon releasing, and to obtain a pressure-sensitive adhesive tape using the same. SOLUTION: The releasing portion is constituted by a pressure-sensitive adhesive layer and a relasably treated layer at the boundary surface of the releasing portion, and the adhesive layer is a rubbery or acrylic pressure- sensitive adhesive composition and has a 100% modulus, measured under specific conditions, of <=1.5 kg/cm2 in the case of the rubbery pressure-sensitive adhesive composition or <=1.0 kg/cm2 in the case of the acrylic pressure-sensitive adhesive composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a peeling portion in which peeling sound is reduced and an adhesive tape used for the same, and the use thereof is not limited at all. Further, it is an object of the present invention to provide a peeling portion for adhesively fixing a fastener tape on the back surface of a release tape. Furthermore, as a structure of the peeling portion used for other disposable absorbent articles such as sanitary napkins, also, medical tape, packaging tape,
It is also suitably used as a structure of a peeling part in a life-related article or the like.

[0002]

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

[0003] For this reason, in the conventional diaper fastener portion, an adhesive which can easily obtain high adhesiveness has been used as an adhesive for the fastener tape, and a reinforcing film has been provided on the front portion of the diaper to facilitate peeling. On the surface of the reinforcing film, a long-chain alkyl-based release treatment agent having a high retention property that does not come off when the fastener tape is fixed has been applied.

While this long-chain alkyl release agent has the advantage of being an excellent release agent to meet the above-mentioned demands, on the other hand, when the mother tries to peel off the fastener tape from the reinforcing film, it has a "crimp". There was a drawback that it came off with a loud noise. Such a peeling sound has caused problems such as waking up a sleeping baby or waking up around a sleeping person, and there has been a demand for improvement.

On the other hand, when a silicone-based release agent generally used as a release agent used for an adhesive tape or the like is used, such a noise is not produced at the time of peeling. However, when a silicone-based release agent is used, the shear adhesive strength with the adhesive layer of the tape is extremely reduced,
There is a drawback that the tape tends to come off when used for a diaper fastener or the like, and at present it is rarely used in such fixed applications.

[0006]

SUMMARY OF THE INVENTION The present inventors have previously filed Japanese Patent Application No. 2-78025 (filed on Oct. 16, 1990).
As proposed in the above, the silicone-based release treatment agent was made to contain a three-dimensional organopolysiloxane, and was subjected to heavy release to achieve both noise reduction and high retention. However, in this method, too much heavy release is pursued due to the pursuit of the high retention of the current long-chain alkyl-based release treatment agent as well as the sound-muffling effect. It is necessary to maintain a high level of peeling force), and the area of peeling force where sound-absorbing peeling is possible is narrowed,
For example, there is a problem that a sufficient peeling effect cannot be obtained with a high peeling force of 500 g / 25 mm.

[0007]

SUMMARY OF THE INVENTION In view of the above problems, the present inventors have studied to further improve the conventional sound-absorbing release properties, and as a result, a pressure-sensitive adhesive composition having a specific low elastic modulus as a pressure-sensitive adhesive layer It has been found that by selecting a product, the object can be achieved in the structure of a peeling portion composed of a combination of the pressure-sensitive adhesive layer and the release treatment layer, and the present invention has been completed.

That is, according to the present invention, in the peeling section whose boundary surface is constituted by a pressure-sensitive adhesive layer and a peeling treatment layer, the adhesive layer is a rubber-based or acrylic pressure-sensitive adhesive composition, When the 100% modulus measured by the tensile test of the rubber-based pressure-sensitive adhesive composition is 1.5 kg / cm ² or less,
In the case of an acrylic pressure-sensitive adhesive composition, the present invention provides a structure of a peeling portion characterized in that the pressure-sensitive adhesive composition is 1.0 kg / cm ² or less, and a pressure-sensitive adhesive tape used therefor.

In the present invention, by employing 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 (over time). It is presumed that there is little difference between the Max value and the Min value of the peeling force due to the change), thereby reducing the vibration of the tape and the peeling noise.

Here, the specific low elastic modulus means that a rubber-based pressure-sensitive adhesive composition has a 100% modulus measured by a tensile test under the above conditions of 1.5 kg / cm ² or less, preferably 0.1 kg / cm ² or less.
1~0.5kg / cm ^2, also in the case of acrylic pressure-sensitive adhesive composition 1.0 kg / cm ² or less, preferably 0.1~0.3kg
/ Cm ² . If the 100% modulus exceeds these values, the elasticity of the pressure-sensitive adhesive increases, and the peeling chart pattern makes noise by repeating the Max value and the Min value alternately during peeling, which is not preferable. Also, if the elastic modulus is too low, the shear adhesive strength is reduced and the tape is easily peeled off,
Not practically preferable.

The composition of the rubber-based or acrylic pressure-sensitive adhesive layer used in the present invention is not particularly limited as long as it has the above-mentioned specific 100% modulus. As, for example, natural rubber,
Any of those mainly composed of synthetic rubber is used. In particular, from the viewpoint of eliminating pollution by hot melt coating, ABA
Type or AB 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 And a styrene-butadiene copolymer or a hydrogenated product thereof).

The acrylic pressure-sensitive adhesive composition is not particularly limited as long as it is crosslinked. For example, acrylic emulsions, polyacrylates (AA, BA,
EA, 2EMA) and the like.

By applying the above-mentioned pressure-sensitive adhesive composition on, for example, a tape support, a pressure-sensitive adhesive layer having the structure of the peeling portion of the present invention or a pressure-sensitive adhesive tape having the pressure-sensitive adhesive layer is formed. You.

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

In the present invention, the release treatment layer constituting the release portion is
The layer is preferably formed using a silicone-based or long-chain alkyl-based release agent. As the silicone-based release agent, a commonly used silicone-based release agent mainly composed of dimethylpolysiloxane can be used. In the present invention, in particular, Japanese Patent Application No. 2-278025
No. 3 as mentioned above,
Those containing a dimensioned organopolysiloxane are preferred. Further, as the long-chain alkyl-based release treatment agent, for example, BP type manufactured by Nitto Denko Corporation, Ashoresin manufactured by Asio Sangyo Co., Ltd., or Piroyl manufactured by Yushi Co., Ltd. can be used.

The coating amount of the above-mentioned release agent is usually 0.01 to 10 g / m ² , preferably 0.1 to 3 g in the case of silicone.
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 perform heavy peeling by slightly reducing the coating amount to satisfy the retention property, and the coating amount is 0.01 to 0.1 g / g.
m ² is preferred.

On the other hand, the above-mentioned release treating agent can be applied to the back surface of the release tape or the reinforcing film of the disposable diaper or directly applied to the back sheet surface of the disposable diaper.

The film or tape as the base material is not limited at all, and may be, for example, a polypropylene-containing plastic described in JP-A-63-112704, a laminate of polypropylene and polypropylene-containing plastic, or polyester. Those are suitable, and the surface thereof may be flat or mat-like. Furthermore, a foam or a substrate having an uneven surface can also be used. Further, it is preferable that the base material be a film containing an olefin-based, styrene-based, urethane-based, or polyester-based elastomer as a main component, thereby exhibiting good slip properties and being 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 agent applied to the surface from falling off, and at least a surface tension of 38 dyne / cm 2 as an index of the treatment strength. ^Two or more are preferred.

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, wherein 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 an example of a structure in which the structure of the peeling portion of the present invention is used for bonding a reinforcing film D on a back sheet B of a disposable diaper A to a fastener tape F. On the back sheet B, a film 1 having the above-mentioned release treatment layer 2 applied on the surface thereof is bonded by an adhesive 3. on the other hand,
A fastener tape F provided with a pressure-sensitive adhesive layer 4 made of a pressure-sensitive adhesive composition containing rubber or acrylic as a main component on a tape support 5 is provided on the release treatment layer 2 of the reinforcing film D via the layer 4. It is adhesively fixed so that it can be peeled off, and the peeling portion of the present invention is formed at the interface between the layer 2 and the layer 4. In addition, instead of the above configuration, a film 1 having a release treatment layer 2 on its surface
May be directly bonded to the backsheet B by heat, or the release treatment agent used in the present invention may be directly coated on the backsheet B of the 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-treated layer 2 made of the above-mentioned release 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 is in contact with the upper surface of the layer 2, and the peeling portion of the present invention is formed at the boundary between the layer 2 and the layer 4.

FIG. 4 shows an example in which the fixing structure of the present invention is applied to a roll-shaped tape T. That is, the above-mentioned pressure-sensitive adhesive layer is provided on the inner surface side of the tape T, and the above-mentioned release treatment layer is applied on the back surface side (not shown). Constitutes a release portion where the pressure-sensitive adhesive layer and the release treatment layer are in contact with each other.

FIGS. 5 and 6 show an example in which the rolled tape T is used as a medical tape or a cardboard packaging tape. That is, if the tape T is wound while being wrapped as shown in FIG. 5, the structure of the peeling portion of the present invention is similarly formed at the wrap portion, and the above-described peeling treatment is previously performed on the sealing portion of the cardboard as shown in FIG. The structure of the peeled portion of the present invention can be similarly obtained by applying the agent and attaching and sealing the tape T (the peeling treatment of the back surface can be omitted).

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. In the description, "%" means% by weight, and "parts" means parts by weight. [Preparation of adherend (reinforcing film)] Polyester (PE
T) On a film (thickness: 12 μm), a silicone-based release agent 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 (Shin-Etsu Chemical Co., Ltd., X
-92-140) solution in toluene / xylene (solid content 30%)
Was applied so that the three-dimensional organopolysiloxane content was 30%, and applied at 0.38 g / m ^2, and then heat-treated at 120 ° C. for 1 minute to form a release-treated layer. An adherend 1 was obtained.

On a oriented polypropylene (OPP) film (thickness: 25 μm), a 2% toluene solution of a long-chain alkyl-based release agent (Piroyl 1010, manufactured by YAS Co., Ltd.) is adjusted to 0.02 g / m 2. 80 ° C x
Heat treatment was performed for 1 minute to obtain an adherend 2 on which a release treatment layer was formed.

[Preparation of pressure-sensitive adhesive tape (zipper tape)] A pressure-sensitive adhesive layer was formed by applying the following pressure-sensitive adhesive composition to one side of a low-density polyethylene film having a thickness of 120 µm to a thickness of 50 µm. Thus, an adhesive tape was obtained.
Here, in Example 1 and Comparative Example 1, toluene 4
Coating on a 0% basis, in Example 2 and Comparative Example 2,
In hot melt coating, Example 3 and Comparative Example 3,
Coating was carried out on a 50% toluene basis.

Example 1 Natural Rubber (manufactured by Kasho Co., Ltd., SMR) 100 parts Petroleum resin (manufactured by Nippon Zeon Co., Ltd., Clayton D-100) 150 parts Softening agent (manufactured by Nippon Oil Co., Ltd.) , Polybran HV-300) 50 parts Anti-aging agent (Ciba Geigy Co., Ltd., Irganox 1010) 2 parts

Comparative Example 1 Natural rubber (manufactured by Kasho Co., Ltd., SMR) 100 parts Petroleum resin (manufactured by Zeon Corporation, Clayton D-100) 50 parts Anti-aging agent (Ciba Geigy Co., Ltd., Irganox 1010) 2 Department

Example 2 Synthetic Rubber SIS (1107, manufactured by Shell) 100 parts Petroleum-based resin (Esmarez 5300, manufactured by Exxon) 60 parts Softener (paraffin oil) 20 parts Anti-aging agent (manufactured by Ciba Geigy Co., Ltd., Irganox) 1010) 2 copies

Comparative Example 2 Synthetic Rubber SIS (JSR-5500, manufactured by Nippon Synthetic Rubber Co., Ltd.) 100 parts Petroleum resin (Clayton N-180, manufactured by Nippon Synthetic Rubber Co., Ltd.) 150 parts Softener (paraffin oil) 50 parts Aging 2 parts of inhibitor (Irganox 1010, manufactured by Ciba-Geigy, Inc.)

Example 3 100 parts of a copolymer of 2-ethylhexyl acrylate and acrylic acid (100 to 2 by weight) 1 part of an isocyanate-based crosslinking agent (Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.)

Comparative Example 3 100 parts of a copolymer of 2-ethylhexyl acrylate, ethyl acrylate and acrylic acid (weight ratio: 100: 40: 3) 100 parts Isocyanate-based crosslinking agent (Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.)

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

Further, a sample piece of the above-mentioned pressure-sensitive adhesive tape was adhered to the release-treated layer of the adherends 1 and 2 to obtain the structure of the release portion of the present invention. Then, an adhesive strength test (peeling force and holding force), sound pressure level measurement at the time of peeling, and a monitor test actually attached to a disposable diaper were performed for each, and the results are shown in Table 1. In addition, each test method is as follows.

[0036]

[Table 1]

[100% modulus]
A 60 μm adhesive was stuck, and the thickness was 200 ± 10 μm, the cross-sectional area was 1 mm ² (adjusted by the width according to the thickness), the grip interval was 10 mm, and the measurement was performed at a measurement temperature of 20 ° C. and a tensile speed of 50 mm / min.

[Peeling force] 2 kg was applied on the surface of the peeling layer of the sample piece on the side of each peeling layer fixed on a stainless steel plate.
The sample piece on the adhesive tape side was adhered by one round trip of the roller, and the 180 ° peel adhesive force was measured at 300 mm / min within 3 minutes after the application.

[Holding Force] The sample prepared in the above-mentioned peeling force test was held vertically, and the time (min) required for the sample piece on the adhesive tape to drop when suspended under a load of 0.5 kg was measured. . The goal was 30 minutes or more.

[Method of measuring sound pressure level]
The adherend was affixed to a commercially available disposable diaper, and the pressure-sensitive adhesive tape of the present invention was pressure-bonded by reciprocating a 700 g roller once. Within 3 minutes after crimping, this adhesive tape can be peeled at a speed of 10 ~
The peeling sound at the time of 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 was measured, it was confirmed to be 50 dB.

[Monitoring test] Each of the above-mentioned sample pieces was actually attached to a fastener portion of a paper diaper, and a monitoring test was conducted by 20 persons on ease of peeling, difficulty in detachment, and quietness of sound upon peeling. The results were evaluated as follows. 17 to 20 people were good. ○ 13 to 16 people were good. △-△ 9-12 people were good. Δ 5 to 8 people were good. ×: 4 or less were considered good. Xx

[0042]

As described above, the structure of the peeling portion according to the present invention is characterized in that a member such as a tape does not easily come off when it is fixed, but it is easy to peel off without making a sound when peeling. 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 and other peeling and fixing, and as a structure of a peeling part of a medical tape, a packaging tape, a life-related article, and the like. It is.

In particular, the structure of the present invention, which can be used for fixing a diaper without noise or capable of sound-absorbing peeling, increases the dissemination rate of the diaper, uses a large amount per day, and is frequently used late at night. It has great practical value in answering consumer demands.

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

In the above, the present invention has mainly been described as being used as a structure of a peeling portion of a diaper. However, the present invention is used not only as a structure of a peeling portion of other disposable absorbent articles such as sanitary napkins, but also as a medical device. Suitable for use in hospitals at night without disturbing the sleep of other patients as the structure of the peeling part using tape, and the structure of the peeling part such as corrugated cardboard using packaging tape that is frequently used in quantity Also, the structure of the peeling portion in various other life-related articles is useful because the peeling noise is reduced. Further, in general, a peeling portion is also formed between tape winding layers in a tape in a roll state, but when the structure of the peeling portion of the present invention is applied to the tape, a peeling sound at the time of rewinding the tape is reduced. It is also effective in improving the environment due to the sound of peeling.

[Brief description of the drawings]

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

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

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

FIG. 4 is an explanatory diagram showing another application example of the present invention.

FIG. 5 is an explanatory diagram showing another application example of the present invention.

FIG. 6 is an explanatory diagram showing another application example of the present invention.

[Explanation of symbols]

 D Adherend 1 Film 2 Release treatment layer 3 Adhesive F Adhesive tape 4 Pressure-sensitive adhesive layer 5 Base

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // A61F 5/44

Claims (4)

[Claims] In a peeling section whose boundary surface is composed of a pressure-sensitive adhesive layer and a release treatment layer, the adhesive layer is a rubber-based or acrylic-based pressure-sensitive adhesive composition, and is subjected to a tensile test under the following conditions. 100% modulus were measured in the case of rubber-based pressure-sensitive adhesive composition, 1.5 kg / cm ² or less, when the acrylic pressure-sensitive adhesive composition, the release portion, characterized in that at 1.0 kg / cm ² or less Construction. 2. The structure of the diaper or napkin peeling part according to claim 1, wherein the surface on which the pressure-sensitive adhesive layer and the release treatment layer are formed is a diaper or napkin constituent member. 3. The structure of a peeled part according to claim 1, wherein the release treated layer is a silicone-based or long-chain alkyl-based release treated layer. 4. The method according to claim 1, wherein the interface is a pressure-sensitive adhesive layer and a release treatment.
Adhesive tape used in the peeling section composed of
And a rubber or acrylic on at least one side of the substrate.
A pressure-sensitive adhesive layer comprising a pressure-sensitive adhesive composition,
The 100% modulus measured by the tensile test under the following conditions is
In the case of a rubber-based pressure-sensitive adhesive composition, 1.5 kg / cm ^Two Below,
In the case of a ril-based pressure-sensitive adhesive composition, 1.0 kg / cm^Two Is below
An adhesive tape characterized by the above-mentioned. (1) Specimen thickness 200 ± 10μm Cross section 1mm^Two Grip interval 10mm (2) Measuring conditions Temperature 20 ° C Pulling speed 50mm / min