JPH09253132A - Tape for disposable diaper, and disposable diaper using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a practical tape having both peeling force and holding force suitable for disposable diaper, and improved in peeling sound by forming an adhesive layer having a rubber adhesive applied thereto, and setting the central line average roughness of the surface having no adhesive layer of a support body to a prescribed value or less. SOLUTION: This disposable diaper is designed so as to be hardly dislocated and never released in fixation by using a fastening tape 2 and a front sheet 3 in order prevent the leakage or dislocation in wearing, and sticking the fastening tape 2 is stuck to the front sheet 3. In the fastening tape 2 for installing the disposable diaper having an adhesive layer on a support body, the adhesive layer is formed of a layer having a rubber adhesive applied thereto, and the central line average roughness of the surface having no adhesive layer of the support body is 7.0μm or less. Thus, a smooth surface is transferred to the surface of the adhesive layer, and an adhesive surface having smoothness can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape for use in a so-called unfolding type diaper which holds a diaper body to a wearer by attaching a fastening tape to a front sheet when the diaper is worn. Regarding a disposable diaper using a tape.

[0002]

2. Description of the Related Art For a diaper to be used, a fastening tape and a front sheet are used as shown in FIG. 1, and the fastening tape is attached to the front sheet in order to prevent leakage and displacement when the diaper is worn. Therefore, it is designed so that it will not slip when fixed and will not come off. On the other hand,
When using the diaper after use, the fastening tape must be easily peeled off from the front sheet for positioning of the tape (determining the degree of tightening of the diaper) or reattachment.

For this reason, a rubber-based pressure-sensitive adhesive which can easily obtain high adhesion is used as the pressure-sensitive adhesive used for the fastening tape of the diaper that has been conventionally used, and a long chain is used for the front sheet to obtain an appropriate peeling force. Alkyl (non-silicone) release agents are used. The adhesive strength of the combination of the adhesive and the release agent is 200 to 1000 g / 25 m.
It was easy to put on and take off the diaper after using it, and the fastening tape did not come off after it was put on.

This long-chain alkyl-based release agent is a release treatment agent that satisfies the above-mentioned quality requirements, but when the fastening tape is peeled off from the front sheet, it peels off with a loud clicking noise, so that the mother and the nurse can take it off. When a person who wears a diaper after using it peels it off in a quiet environment such as a hospital or a bedroom, the wearer such as a baby and others around him are surprised by the peeling sound and awaken.

[0005]

In order to solve these problems, for example, in Japanese Patent Publication No. 7-59244, a silicone containing 5 to 60% by weight of an organopolysiloxane having a three-dimensional release agent for a front sheet is used. It can be realized by combining the system release agent and the adhesive for the fastening tape with an adhesive mainly composed of an ABA type or AB type block copolymer (A is a thermoplastic block and B is a rubber block). However, even if the fastening tape and the front sheet are used in combination, a peeling noise often occurs.

[0006]

As a result of intensive studies on the cause of peeling noise, the present inventor has found that the peeling noise increases when the surface of the adhesive layer of the fastening tape becomes rough, and a means for solving the problem. As a result, it was found that the peeling noise can be reduced by setting the center line average roughness (Ra) of the back surface of the fastening tape within a specific range.

(1) The present invention relates to a fastening tape for mounting a disposable diaper, in which an adhesive layer is provided on a support, wherein the adhesive layer is a layer coated with a rubber-based adhesive, and the support is The centerline average roughness of the surface on which the pressure-sensitive adhesive layer is not provided is 7.0 μm or less. (2) The surface of the support on which the pressure-sensitive adhesive layer is not provided has a release agent layer, and the roll is wound and held so that the pressure-sensitive adhesive layer and the release agent layer overlap each other. It is a diaper tape that you can use. (3) Further, in a diaper having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between the both sheets, as a fastening tape for holding the diaper to a wearer. The disposable diaper according to claim 1, wherein the tape for disposable diaper according to (1) or (2) is used. (4) The disposable diaper according to (3), wherein a front sheet having a silicone-based release agent layer is provided on a portion to be attached when worn.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION As a support for a fastening tape, for example, polypropylene, polyethylene, ethylene-vinyl acetate copolymer, vinyl chloride and other resins are used alone or in combination to form an unstretched polyolefin film or polyurethane. Film, foamed polyester film, synthetic paper, etc. with a thickness of 50-200μ
m, preferably about 80 to 120 μm. The adhesive used for the fastening tape is an ABA type or AB type block copolymer (A is a thermoplastic block,
B is mainly composed of a rubber block, which may be used by appropriately adding a tackifying resin, a softening agent, an antiaging agent, and a filler, and the support may have a thickness of 20 to 80 μm, preferably 35 to 6
The thickness is about 0 μm. A silicone-based or non-silicone-based release agent is applied on the surface without the adhesive layer in an amount of 0.01
To 1.0 g / m ² , preferably 0.05 to 0.5 g / m
There are about ^two .

In the present invention, the center line average roughness of the surface of the support of this fastening tape on which the adhesive layer is not provided is 7.0 μm.
The feature is that the thickness is m or less, preferably 0.1 to 5.0 μm. Incidentally, when the center line average roughness exceeds 7.0 μm, the surface of the pressure-sensitive adhesive is hard to be smooth, and a peeling noise is produced. The fastening tape is
Until it is used and used in a diaper, it may be held in the form of a winding roll so that the pressure-sensitive adhesive layer and the release agent layer overlap each other. By storing the adhesive layer in contact with the back surface, the center line average roughness of the back surface of the support is 7.0 μm.
Hereinafter, by setting the thickness to preferably about 0.1 to 5.0 μm, the smooth surface is transferred to the pressure-sensitive adhesive layer surface, and the pressure-sensitive adhesive surface having smoothness is obtained.

In the fastening tape having a smooth adhesive layer, the adhesive easily fits in with the release agent layer of the front sheet, and the adhesive force increases within 30% within 1 hour immediately after the tape is applied. It is also the ratio, and incidentally, the peeling noise is stably reduced. In addition, when forming a film of the fastening tape substrate, due to restrictions on film forming conditions such as blocking prevention of film winding,
With the current technology, it is difficult to make the center line average roughness of the back surface of the film 0.1 μm or less, but the back surface of the fastening tape has a center line average roughness of 0.1 μm.
If it is m or less, the adhesive force is the rate of increase within 30% just after the tape is applied and 1 hour after the tape is applied, and the accompanying release noise is stably reduced. Can be easily estimated.

On the other hand, the front sheet used in combination with the above-mentioned fastening tape as a diaper to be used is, for example, a flat polyolefin-based or polyester-based one having a thickness of about 5 to 50 μm so as not to impair the texture of the diaper to be used. Or a film obtained by laminating these films on paper or the like, with a release agent layer. The release agent is, for example, a silicone-based release agent 1 mainly composed of polysiloxane in order to exhibit stable release properties.
To 100 parts by weight, 10 to 150 parts by weight of a release control agent for controlling the peeling force is blended,
Further, 0.2 to 11 parts by weight of a silane coupling agent and 0.5 to 1 part of a catalyst are added to 110 to 250 parts by weight of the above-mentioned release agent.
About 1 part by weight of the mixture is applied, dried, and heat-cured.

As a characteristic of the front sheet, the adhesive strength of the fastening tape to the front sheet is 200 to 1
It is 000 g / 25 mm, and the sound pressure at the time of peeling the fastening tape from the front sheet is at a level of 50 dB or less is a release agent having a good balance between adhesive force and peeling sound. By applying the release agent, the adhesion to the front sheet base material and the strength of the release agent coating film are improved, and the release force is not changed by rubbing the front sheet surface of the diaper during use.

[0013]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

Example 1 [Production of Fastening Tape (Diaper Tape)] An unstretched polypropylene (100 μm thick) support having a center line average roughness of 0.7 μm on one side was used. A silicone-based release agent (trade name: LTC-760A, manufactured by Toray Dow Corning) was provided on the surface having a center line average roughness of 0.7 μm at 0.3 g / m ² . Next, a coating liquid for the pressure-sensitive adhesive layer having the following composition was applied to the other surface by 45 μm to obtain a fastening tape (diaper tape) which was wound into a tape shape. (Coating liquid for pressure-sensitive adhesive layer) -Styrene-isoprene-styrene block copolymer (SIS pressure-sensitive adhesive, product name: Kraton D1112, Shell Chemical co.) 44 parts by weight-Tackifying resin (petroleum resin Alcon P- 100, manufactured by Arakawa Chemical Co., Ltd.) 30 parts by weight ・ Tackifying resin (Scorets 1304, manufactured by Tonex Co.) 18 parts by weight ・ Softening agent (naphthenic oil) 7 parts by weight ・ Antiaging agent (phenolic deterioration inhibitor) 1 part by weight

[Production of Front Sheet] 100 parts by weight of an addition reaction type silicone release agent (BY24-162, manufactured by Toray Dow Corning) and 50 parts of a release control agent (BY24-843, manufactured by Toray Dow Corning).
Adhesion improver (by Toray Dow Corning)
3 parts by weight and 3 parts by weight of a catalyst (manufactured by Toray Dow Corning Co., Ltd.) were added and stirred in a mixed solvent of toluene / n-hexane = 7: 3 to prepare a release agent coating solution, which was 20 μm.
It is coated on a m-thick biaxially oriented polypropylene film with a Meyer bar so that the coating amount after drying is 0.3 g / m ^2, and is dried by heating at 110 ° C. for 40 seconds and heat-cured to form a release layer. I got a front seat.

Example 2 As a support for a fastening tape, unstretched polypropylene having a thickness of 100 μm and center line average roughness on one side of 5.0 μm
A fastening tape (taper for diapers) was obtained in the same manner as in Example 1 except that was used. Further, a front seat was obtained in the same manner as in Example 1.

Example 3 As a support for a fastening tape, unstretched polypropylene having a thickness of 100 μm and center line average roughness on one side of 7.0 μm.
A fastening tape (taper for diapers) was obtained in the same manner as in Example 1 except that was used. Further, a front seat was obtained in the same manner as in Example 1.

Comparative Example 1 As a support for a fastening tape, unstretched polypropylene having a thickness of 100 μm and center line average roughness on one side of 8.0 μm.
A fastening tape (taper for diapers) was obtained in the same manner as in Example 1 except that was used. Further, a front seat was obtained in the same manner as in Example 1.

Comparative Example 2 A non-stretched polypropylene having a thickness of 100 μm and a center line average roughness of 12.0 μ on one surface was used as a support for a fastening tape.
A fastening tape (diaper tape) was obtained in the same manner as in Example 1 except that m was used. Further, a front seat was obtained in the same manner as in Example 1.

Comparative Example 3 A fastening tape (taper for diapers) was prepared in the same manner as in Example 1 except that an adhesive mainly containing 2-ethylhexyl acrylate (KP-977, manufactured by Nippon Carbide Co.) was used as the adhesive for the fastening tape. ) Got. Also,
A front sheet was obtained in the same manner as in Example 1.

Comparative Example 4 A fastening tape (taper for diapers) was prepared in the same manner as in Example 3 except that a pressure sensitive adhesive containing 2 ethylhexyl acrylate (KP-977, manufactured by Nippon Carbide Co.) was used as the pressure sensitive adhesive for the fastening tape. ) Got. Also,
A front sheet was obtained in the same manner as in Example 1.

The following tests were carried out using the obtained fastening tape and front sheet, and the results are shown in Table 1.

[Peeling Force] The adhesive surface of the fastening tape was pressure-bonded to the release agent layer of the sample piece of each front sheet fixed on the stainless steel plate. The pressure-bonding conditions were one reciprocation at a speed of 300 mm / min with a pressure-bonding roller having a weight of 2 kg. 1 within 1 minute after crimping and 1 hour after crimping
The 80 degree peeling force (300 mm / min) was measured.

[Release Force Increase Rate] The peel force increase rate was calculated by the following formula. Peel force increase rate (%) = (Peel force for 1 hour after crimping-Crimping 1
Peeling force within 1 minute) / Peeling force within 1 minute of pressure bonding x 100

[Holding power] A reciprocating agent layer of each front sheet sample piece fixed on a stainless steel plate was reciprocated once at a speed of 300 mm / min with a pressure roller of 2 kg weight, and the adhesive area of the fastening tape was 25 mm. It is crimped so that it becomes × 25 mm, and a load of 1 kg weight is applied in an atmosphere of 40 ° C. for 24 hours.
The measured length was the length of the fastening tape displaced after the lapse of time, and the measured value was the time when it dropped within 24 hours.

[Peeling Sound / Noise Meter] The peeling sound was measured using a sound level meter, and the measurement environment was 22 ± 2 ° C., JIS-Z-8.
The equivalent noise level specified in 731 is 35 dB,
In a free-field measurement room where impact noise is within 37 dB, the fastening tape is peeled off at a speed of 10 m / min and 50
The maximum peeling noise at m / min, the sound pressure (dB) at a measurement distance of 30 cm, which was further corrected by the characteristic A, was taken as the measured value.

[Peeling sound / sensory test] When a peeling sound is measured by a sound level meter as a sensory test, the measurer uses an audiometer specified by Article 43, Article 44 and Article 45 of the Occupational Safety and Health Regulations. Age 20 judged to be unacceptable by a hearing test for hertz and 4000 hertz sounds
The number of people who did not feel the peeling noise by any 5 people in their teens and 30s was represented by the measured value from 0 to 5.

[Center Line Average Roughness] The center line average roughness is J
The value obtained by measuring the base material peeling surface of the fastening tape with a stylus type surface roughness meter by the measuring method specified in IS-B-0601 was taken as the measured value.

[0029]

[Table 1]

[0030]

INDUSTRIAL APPLICABILITY As described above, the diaper tape of the present invention is suitable for a diaper by using both the peeling force and the holding force, and is also a very practical one which can improve the peeling noise.

[Brief description of drawings]

FIG. 1 is a perspective view showing a worn diaper in a worn state.

[Explanation of symbols]

 1: Back sheet 2: Fastening tape 3: Front sheet

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location C09J 7/02 JLA C09J 7/02 JLA JLE JLE

Claims (4)

[Claims] Claim: What is claimed is: 1. A fastening tape, comprising a support and a pressure-sensitive adhesive layer, for wearing a diaper during use, wherein the pressure-sensitive adhesive layer is a layer coated with a rubber-based pressure-sensitive adhesive, and the pressure-sensitive adhesive of the support. A disposable diaper tape, characterized in that the center line average roughness of the surface on which no layer is provided is 7.0 μm or less. 2. The surface of the support on which the pressure-sensitive adhesive layer is not provided has a release agent layer, and the pressure-sensitive adhesive layer and the release agent layer are wound and held in a roll shape so as to overlap with each other. The used tape for diapers. 3. A diaper having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between the two sheets, which is used as a fastening tape for holding the diaper to a wearer. A disposable diaper using the tape for disposable diaper according to claim 1 or 2. 4. The diaper for use according to claim 3, wherein a front sheet having a silicone-based release agent layer is provided on a portion to be attached when worn.