JPH0570745A - Double-coated self-adhesive tape, laminate structure prepared therefrom, and their use - Google Patents

Abstract

PURPOSE:To provide a double-coated self-adhesive tape which needs no release paper, can be easily peeled off even when a self-adhesive layer on one side of the tape has been stuck to another self-adhesive layer on the other side, and is suitable for fixing an absorbent article such as a paper diaper or a paper napkin. CONSTITUTION:A double-coated self-adhesive tape A is prepd. by forming a first self-adhesive layer 2 comprising a compsn. consisting of 100 pts.wt. rubber- based self-adhesive compsn. and 0.01-30 pts.wt. silicone polymer on one side of a substrate 1 and a second self-adhesive layer 3 comprising an acrylic or rubber-based self-adhesive compsn. on the other side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided pressure-sensitive adhesive tape which does not require a release paper, and more particularly to a double-sided pressure-sensitive adhesive tape which can be easily peeled and removed after the pressure-sensitive adhesives are adhered to each other. This tape is preferably used for fixing absorbent articles such as paper diapers and napkins.

[0002]

2. Description of the Related Art As a double-sided pressure-sensitive adhesive tape which does not use a release paper (separator), one having a support coated with an acrylic pressure-sensitive adhesive on one side and a rubber-based pressure-sensitive adhesive on the other side has been known. However, this is because the adherend to be applied is limited, the peelability between the adhesives when laminated is uniquely determined by the elastic modulus of the adhesive, etc. and cannot be changed. The agent has a drawback that it cannot be used for an article that is used for a long period of time because of poor storage stability. In addition, the acrylic adhesive and the rubber adhesive have a significant difference in properties such as adhesive strength, heat resistance, and solvent resistance.For example, the rubber adhesive is inferior in heat resistance to the acrylic adhesive, The use of a rubber-based pressure-sensitive adhesive was unsuitable for heat treatment, resin processing, or long-term use after adhesion with tape.

[0003]

Further, as a double-sided adhesive tape that does not require release paper, one side of a support is coated with an adhesive obtained by partially cross-linking an acrylic resin having a carboxyl group in a side chain with isocyanate, and the other side. It is known that an acrylic resin having a hydroxyl group in the side chain is applied with a partially cross-linked adhesive with a melamine resin (for example, JP-A-54-108833). However, since the main component of the pressure-sensitive adhesive is limited to acrylic resin, there is a drawback that the adherend is naturally limited and the adhesion to the adherend such as polyolefin is poor, and the crosslinking of melamine resin Therefore, there is a concern that formalin may be generated, and it is not preferable to use it for sanitary goods.

[0004]

The present invention has been made to solve the above problems, and by using an adhesive layer having a specific composition on one side, there is no need to use release paper, and Provided is a double-sided pressure-sensitive adhesive tape which is easily peeled and attached between pressure-sensitive adhesive layers even when the tapes are laminated.

That is, according to the present invention, one side of the base material has a content of 0.0 to 100 parts by weight of the acrylic or rubber adhesive composition.
Provided is a double-sided pressure-sensitive adhesive tape having a first pressure-sensitive adhesive layer containing 1 to 30 parts by weight of a silicone polymer and an acrylic or rubber pressure-sensitive adhesive layer as a second pressure-sensitive adhesive layer on the other surface. To do.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings of the embodiments. FIG. 1 is a cross-sectional view showing an example of the double-sided pressure-sensitive adhesive tape A of the present invention, in which a first pressure-sensitive adhesive layer 2 is provided on one surface of a base material 1 and a second pressure-sensitive adhesive layer 3 is provided on the other surface.

Here, the first pressure-sensitive adhesive layer is 0.01 to 3 with respect to 100 parts by weight of the acrylic or rubber-based pressure-sensitive adhesive composition.
The pressure-sensitive adhesive layer contains 0 part by weight of a silicone polymer.

The acrylic polymer that constitutes the acrylic pressure-sensitive adhesive composition which is the main constituent of the first pressure-sensitive adhesive layer is not particularly limited, and conventionally known polymers can be applied as they are. Generally, the number of carbon atoms of the alkyl group Is at least 50 with one or two or more of 2-14 acrylic acid alkyl esters and methacrylic acid alkyl esters as the main monomer.
% By weight, with the balance being copolymerized with a functional group-containing monomer such as an unsaturated carboxylic acid copolymerizable with the above-mentioned esters or a modifying monomer such as styrene, vinyl acetate or acrylonitrile. One or two
A mixture of two or more species can be appropriately selected and used. ..

Further, the rubber-based polymer constituting the rubber-based pressure-sensitive adhesive composition is not particularly limited, and examples thereof include natural rubber, styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene copolymer, styrene-ethylene. -Butadiene-styrene copolymer and the like can be mentioned, and one kind or a mixture of two or more kinds thereof can be appropriately selected and used.

Examples of the silicone-based polymer blended with these main components include polydimethylsiloxane, polyorganosiloxane, and mixed modified products thereof. Usually, silicone oil is the main component, and a silicone resin is appropriately used as a release control agent. Can also be added.

The amount of such silicone polymer compounded is
0.01-30 parts by weight, preferably 0.5-1, relative to 100 parts by weight of the acrylic or rubber-based pressure-sensitive adhesive composition.
0 parts by weight. If it is less than 0.01 part by weight, the effect of peeling and desorption with the second adhesive layer described later cannot be obtained, and 3
If it exceeds 0 parts by weight, the adhesiveness and the holding property are poor, which is not preferable.

It is speculated that by blending such a silicone-based polymer, the silicone bleeds over the surface of the pressure-sensitive adhesive layer with time to form a silicone coating, and since the silicone coating has viscoelasticity, it has an adhesive force. Have.

In the present invention, the second pressure-sensitive adhesive layer is not particularly limited, and the above-mentioned acrylic or rubber-based pressure-sensitive adhesive composition which is a normal pressure-sensitive adhesive can be used.

FIG. 2 is a sectional view showing another example of the double-sided pressure-sensitive adhesive tape of the present invention, which is a composite double-sided pressure-sensitive adhesive tape in which two double-sided pressure-sensitive adhesive tapes of FIG. 1 are laminated. Here, the second pressure-sensitive adhesive layer 3 of the double-sided pressure-sensitive adhesive tape A and the first pressure-sensitive adhesive layer 2 of the other double-sided pressure-sensitive adhesive tape B are laminated so as to be separable from each other so as to be peelable from each other. Here, of course, not only the same tape may be laminated, but two or more double-sided adhesive tapes having different adhesive compositions may be laminated to form a composite double-sided adhesive tape.

FIG. 3 is a cross-sectional view showing another example of the double-sided pressure-sensitive adhesive tape of the present invention. The first pressure-sensitive adhesive layer 2 is formed on one side of one side of the substrate 1, and the second pressure-sensitive adhesive layer 3a is formed on the remaining side. , And the second pressure-sensitive adhesive layer 3b and the first pressure-sensitive adhesive layer 2 are formed on the other surface side corresponding thereto, respectively.

FIG. 4 is a cross-sectional view showing another example of the double-sided pressure-sensitive adhesive tape of the present invention. The first pressure-sensitive adhesive layer 2 is provided on one side of one side of the base material 1, and the second pressure-sensitive adhesive is applied to the remaining portion of this one side. Agent layer 3a
The second adhesive on the other surface side facing the first adhesive layer 2.
The adhesive layer 3b is formed. Also, FIG. 3 and FIG.
In the double-sided pressure-sensitive adhesive tape shown in, the second pressure-sensitive adhesive layers 3a and 3b may have the same or different composition.

5 and 6 are double-sided adhesive tape A of FIG.
FIG. 6 is an explanatory view showing an example in which is used as a release tape of a paper diaper, for example, the second adhesive layer 3 of the double-sided adhesive tape A is adhesively fixed to the inner surface side of the rear part of the paper diaper 4 and the fastener tape is provided on the outer surface side. As shown in FIG. 5, an ordinary adhesive tape C is adhered and fixed as the adhesive layer 5 of this adhesive tape before use.
And the first pressure-sensitive adhesive layer 2 of the double-sided pressure-sensitive adhesive tape A are attached to each other in a peelable state between the layers. Then, at the time of use, as shown in FIG. 6, the diaper can be attached by peeling the adhesive tape C between the adhesive layers and adhering and fixing it to the front part of the paper diaper 4.

FIG. 7 is an explanatory view showing an example in which the double-sided adhesive tape A of FIG. 1 is provided on the back side of the napkin 6, and as shown in FIG. 8, it can be folded and stored in a plastic bag 7 made of polyethylene or the like. You can

FIG. 9 is an explanatory view showing a state in which the double-sided pressure-sensitive adhesive tape A of the present invention is wound in a roll shape. Since the first pressure-sensitive adhesive layer 2 and the second pressure-sensitive adhesive layer 3 have different compositions, It is possible to easily peel and attach between the layers of the pressure-sensitive adhesive layer, so that the release paper is not necessary.

Further, in the present invention, FIG. 10 and FIG.
As shown in FIG. 1, the edge portion of the base material 1 may be a so-called dry edge portion 8 in which at least one opposing adhesive layer is not provided, whereby peeling between the adhesive layers can be facilitated.

Example 1 Butyl acrylate and acrylic acid (weight ratio = 97: 3)
100 parts by weight of an acrylic adhesive obtained by copolymerizing
1 part by weight of an addition type silicone polymer (polydimethylsiloxane containing 10% by weight of polyorganosiloxane), 0.02 part by weight of a platinum catalyst are added, and the mixture is heated at 130 ° C. for 60 seconds to obtain a first adhesive composition. I got a thing.

This first adhesive composition is applied to one side of a 25 μm thick polyethylene terephthalate film, and the other side is applied with an acrylic adhesive containing polybutyl acrylate as a main component as a second adhesive, After drying, a double-sided adhesive tape of the present invention was obtained.

The obtained double-sided pressure-sensitive adhesive tape was wound in a roll shape as shown in FIG. 9 and then rewound. Smooth rewinding was possible without any release paper, and there was no problem in practical use.

Example 2 Styrene-isoprene-containing 14% by weight of styrene
Rubber-based SIS containing styrene block copolymer as the main component
To 100 parts by weight of the adhesive, 5 parts by weight of addition-type silicone polymer (polydimethylsiloxane) was added, 0.3 parts by weight of a platinum catalyst was added, and the mixture was heated at 130 ° C. for 60 seconds to give the first adhesive composition. Obtained.

This first adhesive composition was prepared as shown in FIG.
A 150 μm thick polyethylene film is applied to one end on one side, and a rubber-based adhesive made of styrene-ethylene-butadiene-styrene block copolymer as a second adhesive is applied to one end on both sides and dried to form a book. The double-sided adhesive tape of the invention was obtained.

The double-sided pressure-sensitive adhesive tape thus obtained is shown in FIG.
As shown in the above, the diaper was applied to the fastener part of the paper diaper, and the diaper usage test was carried out by 10 people.

[0027]

As described above, in the double-sided pressure-sensitive adhesive tape of the present invention, it is necessary to use a release paper because the pressure-sensitive adhesives can be easily peeled and detached between the pressure-sensitive adhesive layers even if they are overlapped. It has the effect that it can be suitably used as a fastening tape for diapers and napkins.

[0028]

[Brief description of drawings]

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

[0029]

FIG. 2 is a cross-sectional view showing another example of the double-sided pressure-sensitive adhesive tape of the present invention.

[0030]

FIG. 3 is a cross-sectional view showing another example of the double-sided pressure-sensitive adhesive tape of the present invention.

[0031]

FIG. 4 is a cross-sectional view showing another example of the double-sided pressure-sensitive adhesive tape of the present invention.

[0032]

FIG. 5 is an explanatory diagram showing an example in which the double-sided adhesive tape of the present invention is used for a fastener portion of a disposable diaper.

[0033]

FIG. 6 is an explanatory view showing an example in which the double-sided pressure-sensitive adhesive tape of the present invention is used for a fastener portion of a disposable diaper.

[0034]

FIG. 7 is an explanatory view showing an example in which the double-sided adhesive tape of the present invention is used for a napkin.

[0035]

8 is an explanatory view showing an example in which the napkin shown in FIG. 7 is stored in a storage bag.

[0036]

FIG. 9 is an explanatory diagram showing a state in which the double-sided pressure-sensitive adhesive tape of the present invention is wound into a roll.

[0037]

FIG. 10 is an explanatory view showing another example of the double-sided adhesive tape of the present invention.

[0038]

FIG. 11 is an explanatory view showing another example of the double-sided adhesive tape of the present invention.

[0039]

[Explanation of symbols]

 1 Base Material 2 First Adhesive Layer 3 Second Adhesive Layer A Double-sided Adhesive Tape B Double-sided Adhesive Tape 4 Paper Diaper C Adhesive Tape 5 Adhesive Layer 6 Napkin 7 Storage Bag 8 Dry Edge Part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location C09J 133/04 JDD 7242-4J // (C09J 133/04 183: 04) 8319-4J

Claims (6)

[Claims] 1. A first pressure-sensitive adhesive layer comprising, on one surface of a base material, 0.01 to 30 parts by weight of a silicone-based polymer with respect to 100 parts by weight of an acrylic or rubber-based pressure-sensitive adhesive composition. A double-sided pressure-sensitive adhesive tape having an acrylic or rubber-based pressure-sensitive adhesive layer as a second pressure-sensitive adhesive layer on the other surface. 2. A structure in which two or more double-sided pressure-sensitive adhesive tapes according to claim 1 are laminated, wherein the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer face each other in a peelable manner. The laminated structure of the double-sided adhesive tape which is the feature. 3. A laminated structure of a double-sided pressure-sensitive adhesive tape obtained by winding the double-sided pressure-sensitive adhesive tape according to claim 1 without using release paper. 4. The double-sided adhesive tape according to claim 1, which is used as a release tape for a disposable diaper. 5. The second pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive tape according to claim 1 is attached to an adherend, the pressure-sensitive adhesive layer of another pressure-sensitive adhesive tape is attached onto the first pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer and the double-sided tape are bonded together. A method of using a double-sided pressure-sensitive adhesive tape, wherein the first pressure-sensitive adhesive layer can be peeled off between layers. 6. A part of one side of a substrate is 0.01 to 30 with respect to 100 parts by weight of an acrylic or rubber adhesive composition.
A first pressure-sensitive adhesive layer formed by blending parts by weight of a silicone-based resin is provided, and an acrylic-based second pressure-sensitive adhesive layer is provided as a second pressure-sensitive adhesive layer at a portion facing the first pressure-sensitive adhesive layer on the other portion of the same surface and the other surface. Alternatively, a double-sided adhesive tape provided with a rubber-based adhesive layer.