JP3034123B2 - Removable tape system and adhesive tape used therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape system which has a sufficient holding force and a shearing adhesive force to a polyolefin-based adherend (for example, a film) and is removable, and a pressure-sensitive adhesive tape used therefor. It is suitably used mainly as a pressure-sensitive adhesive tape for fastening disposable diapers, a pressure-sensitive adhesive tape for other disposable absorbent articles such as a napkin, a medical tape, or a package for an article.

[0002]

2. Description of the Related Art Generally, in order to fix an adhesive tape for a diaper again after fixing it, a reinforcing film made of polypropylene is provided on the backsheet surface of the diaper so that the backsheet (usually made of polyethylene) is not broken. A method of re-peeling from the fastener tape is adopted above.

[0003]

However, this method has a disadvantage that the softness of the diaper is greatly impaired because the reinforcing film is stuck. Further, the place where the fastener tape is to be applied is limited on the reinforcing film, so that positioning and the like are required, which is inconvenient in use. In particular,
In the field of adult paper diapers, the size of the body is considerably large and small, and a type without a reinforcing film is demanded for size adjustment and leakage prevention.

[0004]

In view of the above-mentioned problems, the present inventor has studied an adhesive which does not increase in adhesive force with time with respect to the polyolefin-based adherend in the re-peeling section. By selecting a pressure-sensitive adhesive having a specific adhesive strength, holding power and peeling power, it is possible to achieve the object in a tape system having a peeling portion composed of a combination of the pressure-sensitive adhesive layer and the adherend. Heading, which has led to the present invention.

That is, the present invention relates to a tape system capable of re-peeling at an interface between a polyolefin-based adherend and an adhesive tape, wherein the adhesive layer of the adhesive tape is an acrylic adhesive and the holding time under a load of 1 kg. Is 10 minutes or more, and the shear adhesive force is 0.5 kg / 25 mm or more, and the peeling force of the pressure-sensitive adhesive tape to the adherend is 1000 g / 25 mm or less, a re-peelable tape system, And an adhesive tape used for the same.

[0006] In the present invention, since an adhesive tape having specific physical properties is used in the tape system of the re-peeling section, it is not necessary to attach a reinforcing film to a polyethylene backsheet of a disposable diaper as in the conventional case. The position for attaching the fastener tape is not limited, and is extremely practical.

The acrylic pressure-sensitive adhesive in the pressure-sensitive adhesive tape used in the tape system of the present invention must have a holding time under a load of 1 kg of 10 minutes or more, preferably 30 to 60 minutes. If the holding time is less than 10 minutes, the tape may come off the adherend, which is not preferable. Further, the shear adhesive strength is 0.5 kg / 25 mm or more, preferably 1.2 to 2.4 kg / 25 mm. If the shear adhesive strength is less than 0.5 kg / 25 mm, the tape may come off from the adherend, which is not preferable. Further, the peeling force of the pressure-sensitive adhesive tape to the adherend is 1000 g / 25 mm or less, preferably 200 to 400 g / 25 mm. Here, the peeling force is 1
If it exceeds 000 g / 25 mm, there is a problem that it is difficult to remove the tape during peeling.

The composition of the acrylic pressure-sensitive adhesive may be determined so as to have the above-mentioned specific physical properties.
In particular, an emulsion-based pressure-sensitive adhesive can be designed to have an infinitely large molecular weight (usually 1,000,000 or more), so that it is estimated that high cohesiveness and high retention can be obtained, and it is preferably used.

The base material of the pressure-sensitive adhesive tape is not particularly limited, and various plastic films and nonwoven fabrics are used. Further, the other side of the base material may be subjected to a release treatment with a release treatment agent such as a silicone-based or long-chain acryl-based release agent if necessary.

The adherend to which the present invention is applied is not particularly limited as long as it is a polyolefin-based material. For example, polyethylene, polypropylene, polyester, ethylene-
One or a mixture of two or more selected from a vinyl acetate copolymer and a copolymer of polyethylene and polypropylene, or those containing a styrene-based elastomer as a main component thereof, are particularly preferable. It can be preferably applied to a kimono.

The form is not particularly limited, and examples thereof include a backsheet in a disposable diaper, a storage bag such as a napkin, and an opening / closing portion of an article package.
These adherends can be subjected to corona treatment as necessary to increase the surface tension and improve the surface chemical adhesion. Further, in order to prevent diaper rash, the invention can be applied to an adherend made porous so as to have air permeability.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of the pressure-sensitive adhesive tape of the present invention.
Shows an adhesive tape provided with. In FIG. 2, an acrylic pressure-sensitive adhesive layer 2 is provided on a part of one surface of a substrate 1, a different kind of adhesive layer 3 is provided on another part, and a release treatment layer 4 is provided on the other surface of the substrate 1. 1 shows an adhesive tape A.

Here, the adhesive layer 3 is for fixing the adhesive tape of the present invention to another member, and for example, a rubber-based, silicone-based, acrylic-based adhesive, or the like is used.
In the present invention, a rubber-based pressure-sensitive adhesive is particularly preferably used, and any of those mainly composed of natural rubber and synthetic rubber is used. In particular, from the viewpoint of detoxification 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 copolymers, styrene-butadiene copolymers or hydrogenated products thereof are mainly used.

FIG. 3 shows a pressure-sensitive adhesive tape B in which an acrylic pressure-sensitive adhesive layer 2 is provided on a part of one surface of a base material 1 and an adhesive layer 3 is provided on another part of the other surface. FIG. 4 shows a pressure-sensitive adhesive tape in which an acrylic pressure-sensitive adhesive layer 2 is provided on both surfaces of a substrate 1. . FIG. 5 shows an adhesive tape in which an acrylic pressure-sensitive adhesive layer 2 is provided on one entire surface of a base material 1 and an adhesive layer 3 is provided on the other entire surface.

FIG. 6 is an explanatory view showing a removable tape system of the present invention when the adhesive tape A of the present invention is applied as a fastener tape to a re-peeling part of a diaper. The adhesive tape A is fixed to a through the adhesive layer 3 so that the adhesive tape A can be re-peeled at the boundary between the back sheet b and the acrylic adhesive layer 2 at the other part of the diaper. FIG. 7 is an explanatory view showing a re-peelable tape system of the present invention when the adhesive tape B of the present invention is applied as a fastener tape to a re-peeling part of a disposable diaper. The tape B is fixed via the adhesive layer 3, and can be peeled off again at the boundary surface between the back sheet b and the acrylic pressure-sensitive adhesive layer 2 at the other part of the diaper.

FIG. 8 is an explanatory view showing a state in which the pressure-sensitive adhesive tape A of the present invention is wound into a roll.

FIG. 9 is an explanatory view showing a state in which the pressure-sensitive adhesive tape A of the present invention is used as a tape for opening and closing a package d made of polyethylene. Become.

FIG. 10 is an explanatory diagram showing another state in which the pressure-sensitive adhesive of the present invention is used as a tape for opening and closing a package. The pressure-sensitive adhesive can be opened and closed at the boundary between the package d and the pressure-sensitive adhesive layer 2.

[0022]

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] Low-density polyethylene (LDPE)
A sheet having a thickness of 50 μm by hot pressing at 150 ° C. was used as an adherend.

[Preparation of pressure-sensitive adhesive tape] The following pressure-sensitive adhesive composition was applied to one side of a low-density polyethylene film having a thickness of 120 μm to form a pressure-sensitive adhesive layer.
Was obtained. Here, in Examples 1 and 2, the coating was dried at 100 ° C. for 5 minutes.

[Adhesive] Example 1 Acrylic emulsion-based adhesive (Acronal-4 manufactured by Mitsubishi Yuka Birdish Co., Ltd.)
D) Molecular weight 1,000,000 or more Solid content 50% pH 6.0-7.5 Average particle size 0.1 μm Viscosity 200-700 cps (Brookfield type)

Comparative Example 1 Synthetic rubber SIS (1107, manufactured by Shell) 100 parts Petroleum resin (Esmarez 5300, manufactured by Exxon) 70 parts Softening agent (paraffin oil) 10 parts Antiaging agent (Irganox, manufactured by Ciba Geigy Co., Ltd.) 1010) 1 copy

Comparative Example 2 100 parts of a copolymer of 2-ethylhexyl acrylate and acrylic acid (100 to 2 by weight) (manufactured by Nitto Denko Corporation) 0.5 part of isocyanate crosslinking agent (manufactured by Nippon Polyurethane Industry Co., Ltd.)

[Preparation of Adhesive Tape for Monitor Test] For the monitor test, as shown in FIG. 2, the adhesives of Examples 1 and 2 and Comparative Example 2 were respectively applied to a part of the substrate 1 and the other part (diaper attached). Part) was provided with the pressure-sensitive adhesive of Comparative Example 1 to form a pressure-sensitive adhesive tape.

Each of these pressure-sensitive adhesive tapes was subjected to an adhesive strength test (shear adhesive strength and holding strength), a peel strength against a back sheet, and a monitor test actually attached to a paper diaper. The results are shown in Table 1. In addition, each test method is as follows.

[0029]

[Table 1]

[Shear adhesive strength] One end side (25 mm × 25 mm) of each sample piece adhered to a small piece obtained by cutting a commercially available paper diaper
Is adhered back and forth with a 2 kg roller, and the other end is pulled in the shear direction with a Tensilon universal testing machine (pulling speed 300
mm / min) and the shear adhesion was measured.

[Holding force] The adherend sheet used in the above-mentioned shear adhesive strength test was stuck on a baking plate, and the tape of the present invention was stuck thereon, and held in a vertical direction at 40 ° C.
The time (minutes) until the sample on the pressure-sensitive adhesive tape side dropped when the sample was hung under the load was measured.

[Peeling Force] The sample piece on the adhesive tape side was adhered to the surface of a polyethylene backsheet fixed on a stainless steel plate by one reciprocation of a 2 kg roller, and within 3 minutes after the application.
180 ° peeling was performed at 300 mm / min, and the initial peeling force was measured. One day after the application, the peeling force was measured again under the same conditions to determine whether re-peelability was possible.

[Monitoring test] Each of the above-mentioned sample pieces was actually attached to a fastener portion of a disposable diaper, and a monitor test was conducted by 15 persons for ease of peeling and difficulty in detachment. The results were evaluated as follows. Twelve were good. ○ 7 to 11 persons were good. Δ: 6 or less were considered good. ×

[0034]

As described above, the removable tape system of the present invention is characterized in that members such as a tape are not easily detached when fixed, but are easily detached. Therefore, it is useful as a structure of a re-peeling part of a disposable absorbent article for the purpose of forming a re-peeling part such as a disposable diaper and other re-peeling fixation, and for opening and closing a medical tape or an article package.

As described above, the present invention has been described mainly on the case where the diaper is used for the re-peeling portion, but the application thereof is not particularly limited.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of the pressure-sensitive adhesive tape of the present invention.

FIG. 2 is a sectional view showing an example of the pressure-sensitive adhesive tape of the present invention.

FIG. 3 is a sectional view showing an example of the pressure-sensitive adhesive tape of the present invention.

FIG. 4 is a sectional view showing an example of the pressure-sensitive adhesive tape of the present invention.

FIG. 5 is a sectional view showing an example of the pressure-sensitive adhesive tape of the present invention.

FIG. 6 is an explanatory diagram showing a re-peelable tape system when the adhesive tape A of the present invention is applied to a paper diaper re-peeling part.

FIG. 7 is an explanatory diagram showing a re-peelable tape system when the adhesive tape B of the present invention is applied to a paper diaper re-peeling part.

FIG. 8 is an explanatory view showing a state in which the pressure-sensitive adhesive tape A of the present invention is wound into a roll shape.

FIG. 9 is an explanatory diagram showing a state in which the adhesive tape A of the present invention is used as a tape for opening and closing a package.

FIG. 10 is an explanatory view showing another state in which the adhesive tape of the present invention is used as a tape for opening and closing a package.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Acrylic adhesive layer A Adhesive tape 3 Adhesive layer 4 Release treatment layer B Adhesive tape a Adherend (backsheet)

Claims (5)

(57) [Claims] 1. A tape system which can be re-peeled at an interface between a polyolefin-based adherend and an adhesive tape, wherein the adhesive layer of the adhesive tape is an acrylic adhesive and the holding time under a 1 kg load is 10 minutes or more. And a shear adhesive strength of 0.5
a removable tape system, wherein the adhesive tape has a peeling force of 1000 g / 25 mm or less with respect to the adherend. 2. A pressure-sensitive adhesive tape used in a tape system capable of being peeled off at an interface between a polyolefin-based adherend and a pressure-sensitive adhesive tape, wherein the pressure-sensitive adhesive tape is held under a load of 1 kg on at least one entire surface or a part of a substrate. A pressure-sensitive adhesive layer made of an acrylic pressure-sensitive adhesive having a time of 10 minutes or more, and a shear adhesive strength of 0.5 kg / 25 mm or more is provided, and the peeling force of the pressure-sensitive adhesive tape to the adherend is 1000 g / 25 mm or less. An adhesive tape, which is characterized in that: 3. A pressure-sensitive adhesive tape used in a tape system capable of being peeled off at the boundary between a polyolefin-based adherend and a pressure-sensitive adhesive tape.
g An acrylic pressure-sensitive adhesive layer having a holding time under a load of 10 minutes or more and a shear adhesive force of 0.5 kg / 25 mm or more is provided, and a different kind of adhesive layer is provided in another portion, and the pressure-sensitive adhesive tape A pressure-sensitive adhesive tape, wherein the acrylic pressure-sensitive adhesive layer has a peeling force of 1000 g / 25 mm or less on the adherend. 4. The method according to claim 1, wherein the acrylic adhesive is an emulsion adhesive.
The tape according to claim 1, wherein the adhesive is an agent.
Stem and adhesive tape. 5. A disposable absorbent such as a disposable diaper or a napkin.
5. The tape system according to claim 1, which is used for an article.
And adhesive tape.