JP3030870B2 - Double-sided adhesive tape - Google Patents

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 in which different pressure-sensitive adhesive layers are formed on both sides of a tape base material. More specifically, the present invention relates to a double-sided pressure-sensitive adhesive tape which can be wound in a roll without using a release sheet. The present invention relates to a double-sided pressure-sensitive adhesive tape capable of easily performing a returning operation.

[0002]

2. Description of the Related Art Conventionally, double-sided pressure-sensitive adhesive tapes having a pressure-sensitive adhesive layer formed on both the front and back surfaces of a substrate have been widely known and are currently used in various industries.

[0003] Usually, a double-sided pressure-sensitive adhesive tape is wound into a roll using a release sheet to separate both pressure-sensitive adhesives, thereby preventing both pressure-sensitive adhesives from bonding and solidifying each other. However, when a release sheet is used, the price of the adhesive tape is relatively high, and when the double-sided adhesive tape is used, it is necessary to dispose of the peeled and removed sheet.

Further, a double-sided pressure-sensitive adhesive tape which can be wound with good rewindability without using a release sheet by forming pressure-sensitive adhesive layers containing acrylic acid-based polymers as main components on both sides of the tape base material and having different composition from each other. Has also been proposed (Japanese Patent Publication No. 35-7480).

When the double-sided pressure-sensitive adhesive tape is wound into a roll, the two pressure-sensitive adhesives come into contact with each other to prevent the two components from mutually diffusing and firmly adhering to each other. Although the composition is changed, such a double-sided pressure-sensitive adhesive tape has two kinds of pressure-sensitive adhesives mainly composed of an acrylic acid-based polymer having good adhesiveness without the components being mutually diffused upon production. It is very difficult to prepare a pressure-sensitive adhesive, and strict examination is required to determine the composition, and therefore, there is a drawback that it takes time to select and prepare the pressure-sensitive adhesive.

On the other hand, the field of application of the double-sided adhesive tape is
In the case of bonding two types of adherends having different properties, strong adhesion may not be obtained with a double-sided adhesive tape using the same type of adhesive on both sides. is there. For example, an acrylic pressure-sensitive adhesive does not exhibit good adhesiveness to a resin film surface such as a polyolefin-based or fluorine-based resin film or a resin film surface such as a silicone rubber or a silicone paint, and cannot firmly bond them.

The present invention has been made in view of the above circumstances, and can be wound with good rewindability without using a release sheet, and can perform complicated operations in the manufacturing process such as preparation of an adhesive. It is an object of the present invention to provide a double-sided pressure-sensitive adhesive tape which has good adhesiveness without necessity, and is capable of satisfactorily bonding two types of adherends having different properties, which were conventionally difficult to bond with a double-sided pressure-sensitive adhesive tape. .

[0008]

According to the present invention, there is provided an organosiloxane having an acrylic pressure-sensitive adhesive layer on one side of a flexible tape base and a vinyl group on the other side. And a silicone-based pressure-sensitive adhesive layer composed of an addition-polymerization-type silicone-based pressure-sensitive adhesive that cross-links with an organopolysiloxane having a SiH group, and is wound into a roll without interposing a release sheet. To provide a double-sided adhesive tape.

[0009]

The double-sided pressure-sensitive adhesive tape of the present invention is wound around a roll and stored and transported. When used, the double-sided pressure-sensitive adhesive tape is rewound from the wound roll by the used amount.

In this case, one of the pressure-sensitive adhesive layers constituting the double-sided pressure-sensitive adhesive tape of the present invention is formed of an acrylic pressure-sensitive adhesive, and the other is an addition layer for crosslinking an organosiloxane having a vinyl group and an organopolysiloxane having a SiH group. Since it is formed by a polymerizable silicone-based pressure-sensitive adhesive, when wound and stacked, the addition-polymerization-type silicone-based pressure-sensitive adhesive itself has a releasability from an acrylic-based pressure-sensitive adhesive,
Since it acts as a release agent for acrylic pressure-sensitive adhesives, there is no need to use a release sheet between both pressure-sensitive adhesive layers, and it is wound with a moderate degree of adhesiveness that does not unwind naturally. is there. Further, the pressure-sensitive adhesive layers may be formed of an acrylic type and an addition polymerization type silicone-based pressure-sensitive adhesive which crosslinks an organosiloxane having a vinyl group and an organopolysiloxane having a SiH group. It can be easily prepared without paying attention to the composition and the like.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. In the drawings, reference numeral 1 denotes a double-sided adhesive tape according to an embodiment of the present invention. The pressure-sensitive adhesive tape 1 is formed by forming an acrylic pressure-sensitive adhesive layer 3 on one surface of a flexible belt-shaped tape base 2 and forming a silicone pressure-sensitive adhesive layer 4 on the other surface.

Here, the tape base material 2 has heat resistance enough to withstand the heating temperature required for processing the pressure-sensitive adhesive layers 3 and 4, and has a mechanical strength when used as a tape. For example, a flexible material having a thickness of about 3 to 30 microns such as paper, nonwoven fabric, woven fabric, resin film such as polyester, polypropylene, and polyimide, and metal foil such as aluminum foil is used.

The composition of the acrylic pressure-sensitive adhesive forming the acrylic pressure-sensitive adhesive layer 3 is not limited.
Although various things can be used, in particular, a copolymer of an acrylate or methacrylate having 2 to 12 carbon atoms in an alkyl group and a carboxyl group or a monomer having a hydroxyl group, isocyanate, melamine or the like A crosslinked pressure-sensitive adhesive is preferably used.

When the acrylic pressure-sensitive adhesive is layered on the tape base material 2, a coating method usually called a transfer method is used, and an acrylic pressure-sensitive adhesive solution is applied to the release-treated surface of a carrier body that has been subjected to a release treatment with silicone or the like. Is applied and dried, and then the tape substrate 2 is adhered to the surface of the adhesive material and pressure-bonded, then peeled off from the carrier body, and the adhesive is transferred to one surface side of the tape substrate 2. Stratified in a manner. If necessary, the tape base material 2 and the acrylic pressure-sensitive adhesive layer 3
An undercoat layer (primer) can also be formed between the two layers to increase the bonding strength between the two.

On the other hand, as the silicone-based pressure-sensitive adhesive forming the silicone-based pressure-sensitive adhesive layer 4, an addition-polymerization-type silicone pressure-sensitive adhesive in which an organopolysiloxane having a vinyl group and an organopolysiloxane having an SiH group are crosslinked with a platinum catalyst. Can be used.

In order to form the silicone-based pressure-sensitive adhesive layer 4 using the above-mentioned silicone-based pressure-sensitive adhesive, the tape base 2 before peeling from the release carrier when the above-mentioned acrylic pressure-sensitive adhesive layer 3 is formed, ie, the release carrier / The double-sided adhesive of the present invention can be formed by directly applying a silicone-based adhesive to the uncoated base material surface of the tape base material 2 in the state of an acrylic-based adhesive / base material and peeling it off from the carrier. Tape 1 can be obtained. In this case, an undercoat layer (primer) may be formed between the tape base material 2 and the silicone-based pressure-sensitive adhesive layer 4.

The double-sided pressure-sensitive adhesive tape 1 is usually wound into a roll as shown in FIG. 2 and stored and transported. In this case, the tape 1 has a state in which the silicone-based pressure-sensitive adhesive layer 3 is stacked on the acrylic-based pressure-sensitive adhesive layer 3 or the reverse state, that is, the state in which the acrylic-based pressure-sensitive adhesive layer 3 is stacked on the silicone-based pressure-sensitive adhesive layer 4. The wound state is shown in FIG. 2 (the former state is shown in FIG. 2). At this time, the wound state of the tape 1 is favorably maintained by the adhesive action between the adhesive layers 3 and 4, and the tape 1 is naturally unwound. There is no winding.

Further, when this double-sided pressure-sensitive adhesive tape is used, since the same type of pressure-sensitive adhesive is not used on both sides, the components in both pressure-sensitive adhesives do not diffuse to each other, and as described above, Since the silicone pressure-sensitive adhesive shows releasability from the acrylic pressure-sensitive adhesive, rewinding of the double-sided pressure-sensitive adhesive tape can be performed extremely smoothly.

The double-sided pressure-sensitive adhesive tape of the present invention is not limited to the examples described above. For example, the type of each pressure-sensitive adhesive and the material of the tape base are not limited to those exemplified in the above-described examples. Various changes may be made without departing from the spirit of the present invention.

[0020]

As described above, the double-sided pressure-sensitive adhesive tape of the present invention can be wound with good rewinding property without interposing a release sheet, and can be used in a manufacturing process such as preparation of a pressure-sensitive adhesive. Particularly, it does not require complicated work and has good adhesiveness, and can adhere well to two types of adherends having different properties, for example, an iron plate and silicone rubber.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a state where the double-sided pressure-sensitive adhesive tape is wound in a roll shape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Double-sided adhesive tape 2 Tape base material 3 Acrylic adhesive layer 4 Silicone adhesive layer

Claims (1)

(57) [Claims] 1. An addition polymerization type in which an acrylic pressure-sensitive adhesive layer is formed on one side of a flexible tape base material, and an organosiloxane having a vinyl group and an organopolysiloxane having an SiH group are crosslinked on the other side. A double-sided pressure-sensitive adhesive tape formed by forming a silicone-based pressure-sensitive adhesive layer comprising the above-mentioned silicone-based pressure-sensitive adhesive, and wound in a roll without interposing a release sheet.