JP2007326960A - Pressure-sensitive transfer adhesive tape and coating film-transferring tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure-sensitive transfer adhesive tape which facilitates the confirmation of a transfer site, when transferred, is free from trouble that a transfer site can be seen through, when a time passes after the transfer, and can simply be produced, and to provide a transfer tool on which the pressure-sensitive transfer adhesive tape is loaded. <P>SOLUTION: This pressure-sensitive transfer adhesive tape having two or more adhesive layers on a substrate is characterized in that one of the adhesive layers comprises a colored adhesive containing a leuco dye and a developer, and the other comprises an adhesive not containing a leuco dye and a developer or containing them in a not-coloring extent. The transfer tool is a tool on which the pressure-sensitive transfer adhesive tape having two kinds of the adhesives is loaded. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pressure-sensitive transfer pressure-sensitive adhesive tape and a transfer tool. More specifically, when a pressure-sensitive adhesive is transferred, it is easy to confirm the transfer location, and after transfer, the transfer location becomes invisible as time passes. The present invention relates to an adhesive tape and a transfer tool equipped with the same.

  One of the double-sided pressure-sensitive adhesive tapes is a non-supported double-sided pressure-sensitive adhesive tape that does not have a support and transfers only the pressure-sensitive adhesive layer to the adherend, and is used for various applications as a pressure-sensitive transfer pressure-sensitive adhesive tape. As its structure, an adhesive layer is provided on one side of the peelable substrate and wound into a roll, or recently, a transfer tool mounted on a transfer device with a small roll mainly for office use is "tape glue" etc. It is sold under the name.

  Such pressure-sensitive transfer adhesive tape, unlike liquid glue or solid glue, can easily transfer the adhesive to the adherend without soiling the hands, and does not require drying time until bonding. It has the advantage that the material does not wrinkle and is a very convenient adhesive product. However, since the pressure-sensitive transfer adhesive tape is usually colorless and transparent, there is an inconvenience that it is difficult to confirm the position of the transferred adhesive when pasting paper or the like.

  Therefore, it has been proposed to add a coloring material to the pressure-sensitive adhesive and color it. However, since there is a problem that the pasted portion can be seen through, the present inventor disclosed in Japanese Patent Application Laid-Open No. 2005-228688 as a color former and a color erasing agent. It has been proposed that the pressure-sensitive adhesive contains microcapsules encapsulating According to Patent Document 1, since the color is transferred at the time of transfer, it is easy to confirm the transfer location. After that, the microcapsule is decolored, so there is no problem that the pasted location can be seen through.

However, the pressure-sensitive adhesive tape having the structure of Patent Document 1 needs to produce and use extremely microcapsules, and the microcapsules are not broken in the tape manufacturing process and can be easily broken after transfer. Although necessary, there is a problem that the color material is decolored regardless of the presence or absence of pressure.
JP 2004-91769 A

  The present invention makes it easy to confirm the transfer position, and after a lapse of time after transfer, the transfer position or affixed portion does not show through or become noticeable, and can be easily manufactured. An object of the present invention is to provide a transfer adhesive tape and a transfer tool equipped with the same.

  As a result of intensive studies to solve the above-mentioned problems, the present inventor has a tape having an adhesive layer containing a colored dye. When the layers are laminated, the degree of coloration decreases due to the dye diffusion action and / or the desensitization action of the pressure sensitive adhesive, in which the dye contained in one pressure sensitive adhesive diffuses to the other during the pasting or pressing. The inventors have arrived at the present invention by conceiving that the coloring of the transferred portion becomes invisible and the problem that the pasted portion can be seen can be solved.

  That is, the present invention is a pressure-sensitive transfer adhesive tape having two or more pressure-sensitive adhesive layers on a substrate, and one of the pressure-sensitive adhesive layers is a colored pressure-sensitive adhesive containing a leuco dye and a developer. The pressure-sensitive transfer pressure-sensitive adhesive tape is characterized in that the pressure-sensitive adhesive layer is made of an agent, and the pressure-sensitive adhesive layer is different from that layer, and contains a pressure-sensitive adhesive containing no leuco dye and developer.

  In the pressure-sensitive transfer pressure-sensitive adhesive tape of the present invention, the pressure-sensitive adhesive layer includes two or more types of pressure-sensitive transfer pressure-sensitive adhesive tapes laminated on a single substrate that one pressure-sensitive transfer pressure-sensitive adhesive tape has. It is preferable that they are formed.

  Further, the present invention is a transfer tool equipped with two types of pressure-sensitive transfer adhesive tape, and the adhesive layer of one of the adhesive tapes is colored containing a leuco dye and a developer. There is provided a transfer tool comprising an adhesive, and the adhesive layer of the other adhesive tape is composed of an adhesive containing no leuco dye and a developer, or containing no adhesive.

  According to the present invention, when the pressure-sensitive adhesive layer is transferred to the adherend, it is easy to confirm the transfer location, and after the time has elapsed after the transfer, it is included in the pressure-sensitive adhesive due to the pressure at the time of bonding or the passage of time. Due to the dye diffusing action and / or the desensitizing action of the pressure sensitive adhesive, the color becomes lighter or colorless compared to the time of transfer, so there is no problem of seeing the transferred or pasted part through. A transfer adhesive tape can be provided. In the present invention, since the microcapsule is not used, it can be easily manufactured.

  As the pressure-sensitive adhesive in the present invention, a widely used pressure-sensitive adhesive can be used. For example, rubber materials such as synthetic rubber and natural rubber, (meth) acrylic acid alkyl ester, (meth) acrylic acid alkyl ether, alkyl vinyl ether An acrylic pressure-sensitive adhesive that is a polymer or copolymer such as an alkyl vinyl ester alone or a mixture of two or more thereof can be mentioned. The pressure-sensitive adhesive may contain a crosslinking agent, a tackifier, a plasticizer, an anti-aging agent, a filler, a thickener, a pH adjuster, an antifoaming agent, and the like.

  In the present invention, as the pressure-sensitive adhesive forming two or more pressure-sensitive adhesive layers, the dye contained in one pressure-sensitive adhesive is transferred to the other pressure-sensitive adhesive after the two or more pressure-sensitive adhesive layers are transferred to the adherend. The pressure-sensitive adhesives constituting the two pressure-sensitive adhesives are preferably the same so that they can be gradually migrated and diffused, but may not be the same as long as they are compatible with each other.

  In the present invention, examples of the leuco dye contained in the pressure-sensitive adhesive include fluorane dyes represented by 3-dimethylamino-6-methoxyfluorane, 2-anilino-3-methyl-6-pyrroline-difluorane, and the like. Examples thereof include lactone dyes represented by crystal violet lactone (CVL) and malachite green lactone. These may be used alone or in admixture of two or more.

  Examples of the developer include phenolic compounds such as bisphenol A, and organic sulfone compounds such as bis- (3-allyl-4-hydroxyphenyl) -sulfone. The dye and the developer can be used alone or in admixture of two or more.

  The pressure-sensitive transfer pressure-sensitive adhesive tape of the present invention has a pressure-sensitive adhesive layer on a substrate in the same manner as a normal pressure-sensitive transfer pressure-sensitive adhesive tape, and the substrate is used for a normal pressure-sensitive transfer pressure-sensitive adhesive tape. For example, polyester tapes such as polyethylene terephthalate, plastic tapes such as polyethylene and polypropylene, and paper can be used. The surface of these substrates may be treated with a release agent such as silicone, wax or higher alcohol.

  In the present invention, the two or more pressure-sensitive adhesive layers may be provided in any order on the base material, but the layer in contact with the base material, that is, the first pressure-sensitive adhesive layer from the base material side. When a layer made of an adhesive containing a leuco dye and a developer is present, the transferred portion looks clearer when transferred to the adherend, and the position can be confirmed more easily.

  The pressure-sensitive transfer pressure-sensitive adhesive tape of the present invention is mounted on a pressure-sensitive transfer tool that is transferred after the pressure-sensitive adhesive layers of two or more types of pressure-sensitive transfer pressure-sensitive adhesive tapes are laminated on one substrate. Can be transferred more easily. Specific examples of such a transfer tool include a coating film transfer tool described in Japanese Patent Application Laid-Open No. 2005-187176. FIG. 1 is an enlarged plan view of the front end portion of the first transfer head (12) and the second transfer head (22) of the coating film transfer tool described in the publication.

  The coating film transfer tool described in Japanese Patent Application Laid-Open No. 2005-187176 includes two tape supply mechanisms and can be equipped with two types of adhesive tapes. In this transfer tool, one adhesive layer moves onto the other adhesive layer and the two adhesive layers are laminated, and then transferred. That is, in this transfer tool, the tip of one transfer head is very close to the other transfer head above the transfer position of the other transfer head. If the pressure-sensitive adhesive layer of one tape is easily peeled off, this pressure-sensitive adhesive layer moves and is laminated on the pressure-sensitive adhesive layer of the other tape, resulting in a single tape having two pressure-sensitive adhesive layers. The laminated pressure-sensitive adhesive layer is transferred to the transfer position at the tip of the other transfer head.

  In the present invention, the moving adhesive layer of the two or more adhesive layers in the present invention is mounted on the tape supply mechanism of the coating film transfer tool as described above so as to be more easily peeled off. A pressure-sensitive transfer pressure-sensitive adhesive tape having two or more pressure-sensitive adhesive layers can be easily obtained.

  The pressure-sensitive transfer pressure-sensitive adhesive tape having two pressure-sensitive adhesive layers in the present invention will be specifically described. The pressure-sensitive transfer pressure-sensitive adhesive tape obtained by applying a colored pressure-sensitive adhesive containing the leuco dye and the developer to a substrate. A coating film transfer tool described above comprising one adhesive tape and a second adhesive tape obtained by applying an adhesive containing no leuco dye and a developer to the extent that it does not contain or is not colored Mounted on the transfer position of the transfer head of the tape supply mechanism on which the first adhesive tape is mounted, the adhesive layer of the second adhesive tape is the same as the adhesive layer of the first adhesive tape. The pressure-sensitive transfer pressure-sensitive adhesive tape of the present invention having a two-layer pressure-sensitive adhesive layer can be obtained.

  Although there is no limitation on which tape supply mechanism of the coating film transfer tool the first adhesive tape and the second adhesive tape are mounted, the adhesive of the first adhesive tape containing the leuco dye and the developer When the adhesive layer that does not contain leuco dye and developer moves on the layer, the resulting pressure-sensitive transfer adhesive tape will have a colored adhesive layer on the substrate side and transferred to the substrate When this is done, the colored adhesive layer side is touched by the human eye, so that the transferred portion looks clearer and the confirmation is easier. In addition, when mounting in this way, the same thing as the base material of the above-mentioned this invention can be used as a base material of a 2nd adhesive tape.

  In the present invention, the content of the dye in the pressure-sensitive adhesive is such that the coloration is easily visible at the time of transfer, and the amount of the dye in the pressure-sensitive adhesive is such that the dye becomes invisible or difficult to see over time after transfer. Blend in. The content of the leuco dye in the pressure-sensitive transfer pressure-sensitive adhesive tape having two or more pressure-sensitive adhesive layers is preferably less than 1.5% by weight. In pressure-sensitive transfer pressure-sensitive adhesive tapes having a normal thickness, coloration is visible when the content of the leuco dye in the pressure-sensitive adhesive is about 1.5% by weight. It is preferable to mix the amount which does not become.

  When the pressure-sensitive transfer adhesive tape of the present invention is mounted on a coating film transfer tool as described above, the content of the leuco dye in the adhesive containing the leuco dye and the developer is 1.5-5. When the amount is less than 0.0% by weight, it is possible to obtain a tape in which a transfer portion can be easily visually recognized at the time of transfer, and the transfer portion cannot be visually recognized after a lapse of time.

  The pressure-sensitive transfer pressure-sensitive adhesive tape of the present invention has the same thickness as that of a normal pressure-sensitive transfer pressure-sensitive adhesive tape, and is usually 5 to 200 μm, preferably 10 to 30 μm. The thickness of the colored adhesive layer containing the leuco dye and the developer and the non-colored adhesive layer may be the same or different. Each thickness may be appropriately determined within the above range in consideration of the ease of confirmation of the transfer location during transfer and the inconspicuousness of the transfer location after the passage of time.

  EXAMPLES Hereinafter, although this invention is demonstrated further more concretely using an Example and a comparative example, this invention is not limited to a following example. In the examples, “parts” is parts by weight.

Example 1
10 parts of leuco dye (crystal violet lactone (manufactured by Tokyo Chemical Industry Co., Ltd.)) as a dye and 4 parts of TG-SA (manufactured by Nippon Kayaku Co., Ltd.) as a developer are acrylic adhesive SK Dyne 1872 ( It was dissolved in 336 parts (manufactured by Soken Chemical Co., Ltd.). This pressure-sensitive adhesive was applied to one side of a 25 μm-thick polyethylene terephthalate (PET) film whose both surfaces were peeled off to obtain a colored pressure-sensitive adhesive layer A.

  Next, acrylic pressure-sensitive adhesive SK Dyne 1872 was applied to one side of a 25 μm-thick PET film having both surfaces peeled to obtain a colorless pressure-sensitive adhesive layer B. In the peeling treatment, the pressure-sensitive adhesive was peeled off more easily than the film coated with the pressure-sensitive adhesive layer A.

  The PET film having the pressure-sensitive adhesive layer A is added to the first tape (19) supply mechanism of the coating film transfer tool described in JP-A-2005-187176 shown in FIG. Each was mounted on the second tape (29) supply mechanism. When the pressure-sensitive adhesive layer was transferred to the paper using a transfer tool equipped with the pressure-sensitive adhesive layers A and B, the tape having the pressure-sensitive adhesive layer A (19a) laminated on the pressure-sensitive adhesive layer B (29a) was printed on the paper surface (50 ). About the obtained transfer tape, the visibility after transfer was evaluated as it mentions later. The results are shown in Table 1.

(Example 2)
As a leuco dye, 8.7 parts of crystal violet lactone (manufactured by Tokyo Chemical Industry Co., Ltd.) and 3.5 parts of TG-SA (manufactured by Nippon Kayaku Co., Ltd.) as a developer are used as an acrylic adhesive SK Dyne. It was dissolved in 336 parts of 1872 (manufactured by Soken Chemical Co., Ltd.). This pressure-sensitive adhesive was applied to one side of a 25 μm-thick PET film having both surfaces peeled to obtain a colored pressure-sensitive adhesive layer C.

  Next, 1.2 parts of crystal violet lactone (manufactured by Tokyo Chemical Industry Co., Ltd.) as the leuco dye and 0.5 part of TG-SA (manufactured by Nippon Kayaku Co., Ltd.) as the developer are acrylic adhesives. It was dissolved in 336 parts of SK Dyne 1872 (manufactured by Soken Chemical Co., Ltd.). This pressure-sensitive adhesive was applied to one side of a 25 μm-thick PET film having both surfaces peeled to obtain a colorless pressure-sensitive adhesive layer D. In the peeling treatment, the pressure-sensitive adhesive was made easier to peel than the film coated with the pressure-sensitive adhesive layer C.

  The obtained PET films having the pressure-sensitive adhesive layers C and D were respectively mounted on the same coating film transfer tool as used in Example 1. When the pressure-sensitive adhesive layer was transferred to paper using the obtained coating film transfer tool, a tape on which the pressure-sensitive adhesive layer C and the pressure-sensitive adhesive layer D were laminated was transferred. About the obtained transfer tape, the visibility of the transfer location was evaluated as described later. The results are shown in Table 1.

Example 3
As a leuco dye, 10 parts of crystal violet lactone (manufactured by Tokyo Chemical Industry Co., Ltd.) and 4 parts of D-8 (manufactured by Nippon Soda Co., Ltd.) as a developer are used as an acrylic adhesive SK Dyne 1872 (Soken Chemical ( 336 parts). This pressure-sensitive adhesive was applied to one side of a 25 μm-thick PET film having both surfaces peeled to obtain a colored pressure-sensitive adhesive layer E.

  Next, acrylic pressure-sensitive adhesive SK Dyne 1872 was applied to one side of a 25 μm-thick PET film having both surfaces peeled to obtain a colorless pressure-sensitive adhesive layer B. In the peeling treatment, the pressure-sensitive adhesive was made easier to peel than the film coated with the pressure-sensitive adhesive layer E.

  The obtained PET films having the pressure-sensitive adhesive layers E and B were respectively mounted on the same coating film transfer tool as used in Example 1. When the pressure-sensitive adhesive layer was transferred to paper using this coating film transfer tool, a tape on which the pressure-sensitive adhesive layer E and the pressure-sensitive adhesive layer B were laminated was transferred. About the obtained transfer tape, the visibility of the transfer location after transfer was evaluated as described later. The results are shown in Table 1.

Example 4
5 parts of Blue-63 (manufactured by Yamamoto Kasei Co., Ltd.) as a leuco dye and 2 parts of TG-SA (manufactured by Nippon Kayaku Co., Ltd.) as a developer are combined with an acrylic adhesive SK Dyne 1872 (Soken Chemical Co., Ltd.). ) Made) was dissolved in 336 parts. This pressure-sensitive adhesive was applied to one surface of a 25 μm-thick PET film having both surfaces peeled to obtain a colored pressure-sensitive adhesive layer F.

  Next, acrylic pressure-sensitive adhesive SK Dyne 1872 was applied to one side of a 25 μm-thick PET film having both surfaces peeled to obtain a colorless pressure-sensitive adhesive layer B. In the peeling treatment, the pressure-sensitive adhesive was peeled off more easily than the film coated with the pressure-sensitive adhesive layer F.

  The obtained PET films having the pressure-sensitive adhesive layers F and B were respectively mounted on the same coating film transfer tool used in Example 1. When the pressure-sensitive adhesive layer was transferred to paper using this coating film transfer tool, a tape on which the pressure-sensitive adhesive layer E and the pressure-sensitive adhesive layer B were laminated was transferred. About the obtained transfer tape, the visibility of the transfer location after transfer was evaluated as described later. The results are shown in Table 1.

(Comparative Example 1)
As a leuco dye, 10 parts of crystal violet lactone (manufactured by Tokyo Chemical Industry Co., Ltd.) and 4 parts of TG-SA (manufactured by Nippon Kayaku Co., Ltd.) as a developer are used as an acrylic adhesive SK Dyne 1872 (Soken Chemical). The product was dissolved in 336 parts. This pressure-sensitive adhesive was applied to one side of a 25 μm-thick PET film having both surfaces peeled to obtain a colored pressure-sensitive adhesive layer A. Next, the above-mentioned pressure-sensitive adhesive was applied to one side of a 25 μm-thick PET film having both surfaces peeled to obtain a colored pressure-sensitive adhesive layer A ′. In the peeling treatment, the pressure-sensitive adhesive was made easier to peel than the film coated with the pressure-sensitive adhesive layer A.

  The obtained PET film having the pressure-sensitive adhesive layer A is added to the first tape (19) supply mechanism of the coating film transfer tool described in JP-A-2005-187176 shown in FIG. Were mounted on the second tape (29) supply mechanism. The visibility of the transfer location of the tape was evaluated in the same manner as in Example 1 using a transfer tool equipped with the pressure-sensitive adhesive layers A and A ′. The results are shown in Table 1.

(Evaluation of visibility after transfer)
For each tape transferred in Examples 1 to 4 and Comparative Example 1, the visibility immediately after transfer and the visibility after 1 day of transfer were evaluated according to the following criteria.

Visibility immediately after transfer ○: Easily visible
Δ: Light color but visible
X: The color was too thin to be visually recognized

Visibility one day after transfer ○: It was very difficult to see where the image was transferred
△: It was possible to visually recognize where it was transferred.
×: Easily understood where the images were transcribed

  Each of the tapes transferred in Examples 1 to 4 and Comparative Example 1 had a blue color immediately after the transfer, and it was easy to see how far the transfer was made. One day after the transfer, in Examples 1 to 4, the blue color disappeared and the transfer location was difficult to understand. On the other hand, in Comparative Example 1, it remained blue even one day after the transfer, and the transfer location was visible and conspicuous. None of the transfer tapes had any change in the adhesive force even one day after the transfer.

  According to the present invention, since the pressure-sensitive adhesive layer contains a dye, it is easy to confirm the transfer location at the time of transfer, and the color of the pressure-sensitive adhesive layer becomes thin and cannot be visually recognized after a lapse of time after transfer. It is possible to easily provide a pressure-sensitive transfer pressure-sensitive adhesive tape that does not have a defect that allows the attached portion to be seen through. The pressure-sensitive transfer adhesive tape of the present invention is particularly useful for office use.

It is a plane enlarged sectional view of the tip part of the first and second transfer heads.

Explanation of symbols

19 First tape 29 Second tape 19a, 29a Adhesive layer

Claims (3)

In the pressure-sensitive transfer adhesive tape having two or more adhesive layers on the substrate,
Among the pressure-sensitive adhesive layers, one pressure-sensitive adhesive layer comprises a colored pressure-sensitive adhesive containing a leuco dye and a developer, and a different pressure-sensitive adhesive layer does not contain a leuco dye and a developer, or A pressure-sensitive transfer pressure-sensitive adhesive tape comprising a pressure-sensitive adhesive containing no coloring.   The pressure-sensitive adhesive layer is formed by laminating a pressure-sensitive adhesive layer of two or more types of pressure-sensitive transfer pressure-sensitive adhesive tapes on a single substrate of one pressure-sensitive transfer pressure-sensitive adhesive tape. The pressure-sensitive transfer adhesive tape described. A transfer tool equipped with two types of pressure-sensitive transfer adhesive tape,
Among the adhesive tapes, the adhesive layer of one adhesive tape consists of a colored adhesive containing a leuco dye and a developer, and the adhesive layer of the other adhesive tape does not contain a leuco dye and a developer. Or a transfer tool comprising a pressure-sensitive adhesive contained to the extent that it is not colored.

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