JP2992450B2 - Structure of peeling part of sanitary napkin - Google Patents

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 for reducing a peeling sound, and is mainly used for a peeling portion of an adhesive tape for a diaper. A fastener tape is releasably adhered to a back surface of a reinforcing film and a release tape. An object of the present invention is to provide a peeling section to be fixed. Further, it is suitably used as a structure of a peeling portion used for other disposable absorbent articles such as sanitary napkins, or as a structure of a peeling portion in medical tapes, packaging tapes, and 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. 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.

[0004] This long-chain alkyl-based release agent has exhibited its advantages as an excellent release agent to meet the above-mentioned demand, but when the mother tries to peel off the fastener tape from the reinforcing film, it has a large "crimp". There was a drawback that it came off with a 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 In view of the above problems, the present inventor has studied to utilize the sound-absorbing release property of a silicone-based release agent, and has found that a specific pressure-sensitive adhesive layer and a specific silicone-based release agent are used. The inventors have found that the purpose can be achieved in the structure of the peeling portion constituted by a combination with the treatment layer, and have completed the present invention.

That is, according to the present invention, in a peeling section whose boundary surface is composed of a pressure-sensitive adhesive layer and a silicone-based release-treated layer, the release-treated layer contains three to three-dimensional organopolysiloxane in an amount of 1 to 80% by weight. % Of the silicone-based release agent, wherein the adhesive layer is composed of an adhesive substance containing rubber as a main component, thereby solving the above-mentioned problems. .

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below mainly on the case where the present invention is used as a structure of a peeling portion of a diaper. However, the present invention is also used as a structure of a peeling portion of another disposable absorbent article such as a sanitary napkin. The structure of the peeling part using medical tape is suitable for use in hospitals at midnight without disturbing the sleep of other patients, and the peeling of corrugated cardboard etc. using the packaging tape that is widely used in quantity The structure of the portion 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.

It is said that a silicone-based release agent originally exhibits releasability when the methyl group in the side chain of the helical structure of dimethylpolysiloxane faces the outside of the helix. However, the arrangement of the methyl groups is disturbed by the mixing of the three-dimensional organopolysiloxane, and the original releasability is lost. According to the present invention, an organopolysiloxane three-dimensionalized based on this concept is 1 to 80.
In addition to using a silicone-based release agent containing a weight percent, and using a pressure-sensitive adhesive mainly composed of rubber as a pressure-sensitive adhesive for bonding, it is possible to obtain the shear characteristics required for fixing diaper tapes and the like. It was successful.

[0010] In the present invention, the pressure-sensitive adhesive layer constituting the peeling portion is made of a pressure-sensitive adhesive material containing rubber as a main component because of the high cohesiveness of the rubber material constituting the pressure-sensitive adhesive material, which results in a high self-resistance to a shear load. This is because holding properties are obtained, and it is considered that the shearing properties with the silicone-based release treatment agent described later are good. According to experiments repeatedly conducted by the present inventors, a shear adhesive force of 1 kg / 25 mm or more was obtained when a sticky substance containing rubber as a main component was used,
200g / 25 for general-purpose acrylic pressure-sensitive adhesive
Only a shear adhesion of less than mm width was obtained.

[0011] Adhesive substances mainly composed of rubber include:
Any of natural rubber and synthetic rubber can be used. Particularly, from the viewpoint of detoxification by hot melt coating, an ABA type or AB type block copolymer (A is a thermoplastic block, B is Is a rubber block, for example, a styrene-isoprene-styrene copolymer, a styrene-butadiene-styrene copolymer, a styrene-ethylene-butadiene-styrene copolymer, a styrene-butadiene copolymer, or a hydrogenated product thereof. Preferably, the main component is.

The pressure-sensitive adhesive layer of the present invention is constituted by coating the above-mentioned adhesive substance mainly composed of rubber on a member such as a tape support.

The silicone-based release treatment layer constituting the release portion in the present invention can be formed of a generally used silicone-based release treatment agent mainly composed of dimethylpolysiloxane. Can also be used.

The three-dimensional organopolysiloxane contained in the silicone-based release agent has an average composition formula of [R ₃ SiO _0.5 ] _a [R ₂ SiO] _b [RSiO _1.5 ].
_c [SiO ₂ ] _d (wherein R represents a monovalent hydrocarbon group, a, b, c and d each represent a molar fraction of each siloxane unit, and a = 0.1
~ 0.6, b = 0 ~ 0.45, c = 0 ~ 0.3, d = 0.3 ~ 0.8
Wherein a / d = 0.3 to 2.0).

The three-dimensional organopolysiloxane is 1
-80% by weight, preferably 5-60% by weight. If the content is less than 1% by weight, the required effect of heavy peeling cannot be obtained, and if it exceeds 80% by weight, the film is excessively peeled off and peeling becomes difficult, which is not preferable.

The silicone-based release agent containing a predetermined amount of the three-dimensional organopolysiloxane is preferably applied without solvent, but if the viscosity is high, a small amount of an organic solvent is added. The viscosity may be reduced, the film may be applied to a film or a tape, followed by a drying treatment, followed by an ultraviolet irradiation treatment. The amount of the silicone release agent applied is
0.01 to 10 g / m ² , preferably 0.1 to 3 g / m ² is good.

The above silicone release agent can be applied to the back surface of the release tape or the backing film of the diaper, or directly applied to the back sheet of the diaper. As the film or tape as a base material, a polypropylene-containing plastic described in JP-A-63-112704, a laminate of polypropylene and a polypropylene-containing plastic, or a film made of polyester is preferable, and the surface thereof is flat. Shape or mat shape. 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 section of the present invention is used for bonding a reinforcing film D on a back sheet B of a disposable diaper A and a fastener tape F. The film 1 having the above-mentioned silicone-based release treatment layer 2 coated on the surface of the back sheet B with an adhesive 3 is joined. On the other hand, a fastener tape F provided with a pressure-sensitive adhesive layer 4 made of a sticky substance containing rubber as a main component on a tape support 5 on the release treatment layer 2 of the reinforcing film D is peeled off via the layer 4. It is freely bonded and fixed, and the peeling portion of the present invention is formed at the interface between the layer 2 and the layer 4. Instead of the above-described configuration, a configuration in which the film 1 having the release treatment layer 2 on the surface is directly thermally bonded to the back sheet B, or the release treatment agent used in the present invention is directly applied to the back sheet B of the paper diaper A. May be applied.

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 an adhesive substance containing rubber as a main component is provided on the inner surface on one end side of the napkin N, while a release treatment layer 2 made of the silicone-based release agent is provided on the inner surface on the other end side. Painted,
The napkin N is folded so that the pressure-sensitive adhesive layer 4 is in contact with the upper surface of the release treatment layer 2, and the boundary between the layer 2 and the layer 4 forms the release portion of the present invention.

FIG. 4 shows an example in which the fixing structure of the present invention is applied to a roll tape T. That is, a pressure-sensitive adhesive layer made of an adhesive substance containing rubber as a main component is provided on the inner surface side of the tape T, while the silicone-based release treatment layer is applied on the back surface side (not shown), In such a roll state, a peeling portion is formed at the boundary surface between the winding layers, where the pressure-sensitive adhesive layer made of an adhesive substance containing rubber as a main component and the silicone-based 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 wrapped portion, and as shown in FIG. The structure of the peeled portion of the present invention can be similarly obtained by applying a peeling treatment agent and attaching and sealing a tape T (the peeling treatment of the back surface can be omitted).

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. “Parts” in the text means parts by weight. Organopolysiloxane (X-92 manufactured by Shin-Etsu Chemical Co., Ltd.) formed into a three-dimensional toluene solution (solid content: 30% by weight) of addition reaction type silicone (X-62-2378 manufactured by Shin-Etsu Chemical Co., Ltd.) having a viscosity at 25 ° C. of 1500 cps. -140) was prepared by mixing a toluene / xylene solution (solid content: 30% by weight) with organopolysiloxanes which were three-dimensionally formed so as to be 10% by weight, 30% by weight, and 50% by weight, respectively. These solutions contain platinum
1000 ppm of vinyl siloxane (PL-5 manufactured by Shin-Etsu Chemical Co., Ltd.)
0T) as a complex with the silicone composition 10
Two parts were added as a catalyst to 0 parts by weight. This solution was applied as a release agent to a polyester film having a thickness of 12 μm at 0.3 g / m ^2, and then heated at 120 ° C. for 1 minute to form a release layer. Was obtained.

On the other hand, 40 parts of a styrene-isoprene-styrene copolymer was coated on one side of a low-density polyethylene film having a thickness of 120 μm with a petroleum resin 40 as a tackifying resin.
Parts, 19 parts of paraffin oil as softener, antioxidant 1
A pressure-sensitive adhesive layer was formed by applying a 50-μm-thick adhesive substance containing rubber as a main component and having a length of 70 μm.
The sample was cut to a size of 25 mm x 25 mm to obtain a sample piece on the adhesive tape side. The sample piece on the side of the release treatment layer is
Examples 2 and 3 of the present invention were adhered to Examples 2 and 3 of the present invention, and an adhesive force test (peeling force, shearing adhesive force, and holding force) was performed on each of them.
, And a monitor test was conducted by actually attaching it to a paper diaper. Note that Example 1 contained 10% by weight of the three-dimensional organopolysiloxane, Example 2 contained 30% by weight, and Example 3 contained 50% by weight.

[0026]

[Comparative Example] Comparative Example 1 uses 3 as a silicone release agent.
Comparative Example 2 in which the dimensionally reduced organopolysiloxane was not blended was replaced with a long-chain alkyl-based release agent instead of the silicone-based release agent (Piloyl manufactured by YAS Co., Ltd.)
1010) 2% toluene solution was applied at 0.5 g / m ² ,
This was a heat treatment for 30 seconds to obtain a sample piece on the release treatment layer side. Comparative Examples 3, 4, and 5 are the same as those of Examples 1, 2, and 3 except that an acrylic pressure-sensitive adhesive (2-ethylhexyl acrylate and acrylic acid) was used as a sample piece on the adhesive tape side in place of an adhesive substance containing rubber as a main component. And a weight ratio of 100: 2). The results are shown in Table 1. In addition, each test method is as follows.

[0027]

<Peeling Force> A 2 kg roller reciprocates a sample piece on the adhesive tape side on the surface of the peeling layer of each of the sample layers 1, 2 and 3 fixed on the stainless steel plate. 180 ° peel adhesion was measured at 300 mm / min within 3 minutes after the application.

<Shearing Adhesive Strength> Samples 1, 2, and 3 on the side of each release-treated layer adhered to small pieces obtained by cutting commercially available disposable diapers.
One end (25 mm × 25 mm) of the sample piece on the adhesive tape side was adhered to the surface of the release treatment layer of No. 3 with one reciprocation of a 2 kg roller, and the other end was pulled in the shear direction with a Tensilon type universal testing machine (tensile speed). , 300 mm / min), and the shear adhesion was measured.

<Holding Force> The sample prepared in the above-mentioned shear adhesive strength test was held vertically, and the time (min) until the sample on the adhesive tape dropped when suspended under a load of 1 kg was measured. .

<Monitor Test> Each of the above-mentioned sample pieces was actually attached to a fastener portion of a paper diaper, and a monitor test was conducted by 10 persons on the ease of peeling, the difficulty of detachment, and the quietness of the sound upon peeling. 8 or more out of 10 evaluated as good, 5 to 7 evaluated as good, and 4 or less evaluated as x.

[0032]

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 during fixing, but the peeling sound can be reduced and the peeling can be easily performed at the time of peeling. Therefore, it is useful as a structure of a peeling part of a disposable absorbent article for forming a peeling part such as a paper diaper and other peeling and fixing, and as a structure of a peeling part such as a medical tape and a packaging tape. In particular, the structure of the present invention, in which no sound or peeling sound is reduced for fixing a diaper, increases the dissemination rate of the diaper, consumes a large amount per day, and is frequently used late at night. It has great practical value in answering the needs of the elderly.

[0033]

[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]

 DESCRIPTION OF SYMBOLS 1 Film 2 Silicone release treatment layer 3 Adhesive 4 Pressure-sensitive adhesive layer 5 Tape support

Claims (1)

(57) [Claims] 1. A pressure-sensitive adhesive formed on a sanitary napkin.
Agent layer (a) and silicone-based release treatment layer in contact therewith
(B) The structure of the peeling part of the sanitary napkin composed of
In the above, the pressure-sensitive adhesive layer (a) is an ABA type or
AB type block copolymer (A is a thermoplastic block, B is
Adhesives mainly composed of rubber consisting of rubber blocks)
And the silicone-based release treatment layer (b) is
Contains 1 to 80% by weight of modified organopolysiloxane
Each composed of a silicone-based release agent
The structure of the peeling part of the sanitary napkin characterized by the above.