JP2002188062A - Adhesive transfer type pressure-sensitive adhesive tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive transfer type pressure-sensitive adhesive tape that has improved sharp adhesive separation properties of the pressure-sensitive adhesive layer without adverse effect on the adhesive power to paper surface and the like and on the traveling properties. SOLUTION: In the adhesive transfer type pressure-sensitive adhesive tape that is used as it is loaded in the transfer apparatus equipped with the feed reel around which an adhesive transfer type pressure-sensitive adhesive tape is rolled, the head for pressing the pressure-sensitive tape unrolled and fed from the feed reel to the adherend to transfer the adhesive layer, and the winding reel for winding up the base material separated from the pressure-sensitive adhesive layer after the transfer operation, the pressure-sensitive adhesive layer comprises at least 5-35 pts.wt. of a tackifying resin softening at 90-160 deg.C and 0.5-10 pts.wt. of a crosslinking agent per 100 pts.wt. of an acrylic copolymer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive tape which is used by being housed in a hand-held transfer tool, wherein the pressure-sensitive adhesive layer is pressed by the transfer tool against a transfer object such as paper. The present invention relates to a transfer-type pressure-sensitive adhesive tape that can be transferred to a transfer target and glue the transfer target to another article.

[0002]

2. Description of the Related Art In recent years, transfer-type pressure-sensitive adhesive tapes have been attracting attention in place of double-sided adhesive tapes and stick adhesives because of their easy handling.

As this type of transfer type pressure-sensitive adhesive tape,
A structure having a pressure-sensitive adhesive layer provided on one side of a base material such as an organic polymer film or paper is known. The transfer-type pressure-sensitive adhesive tape is used by being housed in a hand-held transfer tool.

FIG. 1 is a schematic view showing an example of a hand-held transfer tool containing a transfer-type pressure-sensitive adhesive tape. Reference numeral 1 denotes a transfer type pressure-sensitive adhesive tape, in which a pressure-sensitive adhesive layer 3 is provided on a base material 2. The main components of the transfer tool are a supply reel 10 in which the transfer type pressure-sensitive adhesive tape 1 is wound in a roll shape,
A wedge for pressing the take-up reel 11 of the base material 2 and the transfer type pressure-sensitive adhesive tape 1 rewound from the supply reel and pressing the transfer-type pressure-sensitive adhesive layer 3 onto a transfer object 13 such as paper. And a head 12 having a cylindrical shape. FIG. 1
, A gear mechanism for driving the supply reel 10 and the take-up reel 11, a cartridge for setting the supply reel 10 and the take-up reel 11 to be mounted on the transfer device, a case body, and the like are omitted.

When the transfer tool is moved on the transfer object 13 in the direction of arrow A, the transfer-type pressure-sensitive adhesive tape 1 is pulled out and pressed by the head 12, so that the pressure-sensitive adhesive layer 3 is separated from the base material 2. It is peeled off and adhered onto the transferred body 13. On the other hand, the base material 2 separated from the pressure-sensitive adhesive layer 3 is taken up on a take-up reel 11. After the predetermined length of the pressure-sensitive adhesive layer 3 has been transferred, the transfer tool is pulled up from the surface of the transferred body 13 and the pressure-sensitive adhesive layer 3 is cut, thereby completing the transfer operation.

However, in such a transfer-type pressure-sensitive adhesive tape, if the sharpness of the pressure-sensitive adhesive layer is poor, after the transfer of the pressure-sensitive adhesive layer 3 is completed, the transfer tool is pulled up from the surface of the transfer object 13. In this case, as shown in FIG. 2, the pressure-sensitive adhesive layer 3 transferred to the surface of the transfer object 13 without cutting the pressure-sensitive adhesive layer 3 and the pressure-sensitive adhesive layer on the transfer tool 14 side. In some cases, a phenomenon (hereinafter, referred to as a stringing phenomenon) in which the pressure-sensitive adhesive pulls the thread 4 between the pressure-sensitive adhesive sheet 3 and the transfer sheet 3 may hinder the transfer operation.

Conventionally, alginic acid has been dispersed in an acrylate-based pressure-sensitive adhesive in order to improve the sharpness of the pressure-sensitive adhesive layer and prevent the stringing phenomenon (Japanese Patent Application Laid-Open No. Hei.
No. 239413), or crosslinking an adhesive has been proposed. It has also been proposed to add silica to the pressure-sensitive adhesive layer (JP-A-4-131297).

[0008] However, according to the studies by the present inventors, these conventional techniques cannot always sufficiently prevent the stringing phenomenon, and further improvement is desired.

[0009]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a transfer-type pressure-sensitive adhesive tape having an improved sharpness of a pressure-sensitive adhesive layer without impairing the adhesive force to paper and running property. The task is to provide.

[0010]

The present inventors have conducted intensive studies on the pressure-sensitive adhesive layer of a transfer-type pressure-sensitive adhesive tape, and as a result, have specified an acrylic copolymer, a tackifying resin and a crosslinking agent. It has been found that a pressure-sensitive adhesive tape excellent in adhesive strength to paper and the like and running properties and excellent in sharpness can be obtained by blending at a ratio of.

That is, the present invention relates to a supply reel in which a transfer type pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on a substrate is wound in a roll shape, and the pressure-sensitive adhesive which is rewound from the supply reel and supplied. It is housed in a transfer tool consisting of a head for pressing the adhesive tape onto the transfer target to transfer the pressure-sensitive adhesive layer, and a take-up reel for winding the pressure-sensitive transfer layer after transfer and the separated substrate. In the transfer type pressure-sensitive adhesive tape used, the pressure-sensitive adhesive layer has a softening point of at least 5 to 35% by weight of a tackifying resin having a softening point in the range of 90 ° C to 160 ° C with respect to 100 parts by weight of the acrylic copolymer. Part and crosslinking agent 0.5-1
The present invention relates to a transfer-type pressure-sensitive adhesive tape characterized by being formed from a pressure-sensitive adhesive composition mixed with 0 parts by weight.

Further, the present invention relates to the above-mentioned transfer type pressure-sensitive adhesive tape, wherein the tackifying resin comprises a rosin resin and / or a terpene resin.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a supply reel in which a transfer-type pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on a substrate as shown in FIG. A head for pressing the pressure-sensitive adhesive tape supplied from the unwound material to the transfer target to transfer the pressure-sensitive adhesive layer, and for winding the substrate separated from the pressure-sensitive transfer layer after the transfer. The present invention relates to a transfer-type pressure-sensitive adhesive tape which is used by being stored in a transfer tool including a take-up reel. However, it is not limited to the transfer tool shown in FIG.

According to the present invention, the pressure-sensitive adhesive layer of the transfer-type pressure-sensitive adhesive tape has a softening point of at least 90 ° C. to 160 ° C. with respect to 100 parts by weight of the acrylic copolymer. To 35 parts by weight and a crosslinking agent 0.5 to 10
It is characterized by being formed from a pressure-sensitive adhesive composition mixed with parts by weight. As described above, by crosslinking the acrylic copolymer with a specific amount of a crosslinking agent, the sharpness of the pressure-sensitive adhesive layer is improved, and the stringing phenomenon is improved. Even if the stringing phenomenon is improved in this way, the adhesion, particularly the initial tack (tack), is excellent by adding a specific amount of tackifier. Moreover, since a softening point in the range of 90 ° C. to 160 ° C. is used as the tackifier, the pressure-sensitive adhesive tape wound on a roll can be used as a base for the pressure-sensitive adhesive layer to be in contact with the pressure-sensitive adhesive. Blocking of the transfer (hereinafter simply referred to as blocking) can be prevented, and the roll-shaped pressure-sensitive adhesive tape can be smoothly rewound, so that the transfer tool can run smoothly, and the pressure-sensitive transfer tape can be transferred to the end (hereinafter, referred to as the end) This property is referred to as good running property).

The substrate used in the present invention includes:
Various organic polymer films such as a polyester film, a polycarbonate film, a polymethyl methacrylate film, a polyethylene film, a polypropylene film, and a polyimide film can be used, but a polyethylene film and a polyester film are particularly preferable in terms of cost and performance. The film thickness is preferably 6 to 50 μm from the viewpoint of transferability and cost.
And more preferably 12 to 25 μm.
Paper bases can also be used. Examples of paper bases include high-density paper such as glassine paper, and laminated paper obtained by laminating an organic polymer film such as polyethylene on clay-coated paper, kraft paper, or high-quality paper. However, in view of cost and performance, glassine paper is preferably used, and the paper thickness is preferably in the range of 20 to 50 μm.

These substrates are preferably used as a release sheet by applying a release agent such as a silicone compound, a fluororesin or a fluorosilicone resin on both surfaces of the substrate.

The acrylic copolymer used in the pressure-sensitive adhesive composition of the present invention includes one or more alkyl (meth) acrylates having an alkyl group having 4 to 18 carbon atoms; Examples of the copolymer include a copolymer of one or more copolymerizable monomers having a carboxyl group and, if necessary, one or more monomers having another copolymerizable vinyl group. These acrylic copolymers can be used alone or in combination of two or more.

The alkyl (meth) acrylate includes, for example, n-butyl (meth) acrylate,
Isobutyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) Acrylate and the like.

The carboxyl group-containing copolymerizable monomers include acrylic acid, methacrylic acid, (anhydride) maleic acid, itaconic acid and fumaric acid. The carboxyl groups of these monomers act as crosslinking points that react with the crosslinking agent.

Other monomers having a copolymerizable vinyl group include, for example, acrylonitrile, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, styrene, α-methyl Styrene, vinyl acetate, N-vinyl-2-pyrrolidone, benzyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and the like may be mentioned, and these may be appropriately selected and used. Can be.

Examples of the tackifying resin include rosin, rosin phenol resin and its ester compound, rosin resin such as metal salt, terpene polymer, terpene phenol resin, terpene resin such as aromatic modified terpene resin, styrene resin, Coumarone / indene resin, alkylphenol resin, xylene resin, C5 petroleum resin, C9 petroleum resin, alicyclic hydrogenated resin, etc. can be used, but they have excellent compatibility with acrylic copolymers and When used in combination with a polymer, a rosin resin and / or a terpene resin of a natural resin having good adhesiveness to an adherend such as paper or various films and having an initial tackiness (tack) are preferable. used.

The tackifying resin has a softening point of 9
Those having a temperature range of 0 ° C to 160 ° C are used. When the softening point of the tackifying resin is lower than 90 ° C., storage stability such as blocking of the pressure-sensitive adhesive tape is reduced, and when the softening point is higher than 160 ° C., adhesion to an adherend such as paper or various films is performed. Properties and initial tackiness are reduced.

The tackifier resin must be contained in an amount of 5 to 35 parts by weight based on 100 parts by weight of the acrylic copolymer constituting the pressure-sensitive adhesive layer. If the amount of the tackifying resin is less than 5 parts by weight, the rubber elasticity of the pressure-sensitive adhesive layer is too high, and the sharpness of the pressure-sensitive adhesive layer at the time of transfer to a transfer target body is poor.
When the amount exceeds 5 parts by weight, the adhesive strength is reduced, and at the same time, the blocking is caused to deteriorate the storage stability.

In the pressure-sensitive adhesive composition of the present invention, the crosslinking agent for crosslinking the acrylic copolymer includes, for example,
Hexamethylene diisocyanate, xylylene diisocyanate, tolylene diisocyanate, 2-chloro-
Diisocyanate compounds such as 1,4-phenyl diisocyanate, trimethylhexamethylene diisocyanate, 1,5-naphthalene diisocyanate, and isophorone diisocyanate; A crosslinking agent, an epoxy-based crosslinking agent, a melamine-based crosslinking agent, a metal chelate-based crosslinking agent, an adduct of a polyol such as trimethylolpropane, and the like, may be used, and one or more of these may be selectively used as appropriate. it can.

The crosslinking agent must be contained in an amount of 0.5 to 10 parts by weight based on 100 parts by weight of the acrylic copolymer constituting the pressure-sensitive adhesive layer. When the amount of the crosslinking agent is less than 0.5 parts by weight, the holding power is inferior due to insufficient crosslinking, and a stringing phenomenon occurs. On the other hand, when the amount exceeds 10 parts by weight, the pressure-sensitive adhesive layer becomes too hard. And the adhesive strength decreases.

Further, an inorganic pigment such as silica, alumina or titanium oxide can be added to the pressure-sensitive adhesive composition, if necessary, in order to assist in improving the sharpness. In this case, the average particle size of the pigment is preferably 0.3 to 3 μm in consideration of sharpness and pigment dispersibility. The amount of these inorganic pigments is preferably 5% by weight or less based on the total amount of the pressure-sensitive adhesive layer in consideration of the adhesiveness and pigment dispersibility of the pressure-sensitive adhesive layer.

Further, an inorganic or organic coloring agent may be added to the pressure-sensitive adhesive composition within a range that does not impair the adhesiveness, tackiness, sharpness, etc., to color the adhesive layer.

As a device for applying the pressure-sensitive adhesive composition of the present invention, for example, a bar coater, a roll coater, a gravure coater, a knife coater, a die coater, a comma coater, a lip coater and the like can be appropriately used.

The thickness of the pressure-sensitive adhesive layer is 5 to 35 μm in consideration of the adhesive strength to paper and the like, holding power and sharpness.
m, preferably in the range of 10 to 25 μm.

[0030]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should be understood that the present invention is by no means restricted thereto. In the following, “parts” means “parts by weight”, and the number of parts, the coating amount, and the like are all represented by solid content.

Example 1 <Production of release sheet> 97 parts of a silicone release agent (KS-3502, manufactured by Shin-Etsu Chemical Co., Ltd.) and silica (Nippon Silica Industry Co., Ltd.) were applied on one side of a 16 μm polyethylene film as a release sheet. Nip seal 220A) was coated with a gravure coater to a dry weight of 0.7 g / m ² and dried with hot air to obtain a heavy peeled surface. Next, a silicone release agent (X-62-2676, manufactured by Shin-Etsu Chemical Co., Ltd.) was applied to the other surface of the release sheet.
Coating was performed with a gravure coater so as to have a dry weight of 0.5 g / m ² , followed by hot air drying to obtain a lightly peeled surface.

<Production of Acrylic Pressure-Sensitive Adhesive Composition> A pressure-sensitive adhesive composed of an acrylic copolymer (manufactured by Yushi Kogyo Co., Ltd.)
Manufactured by Vinesol R-1500S)
Disproportionated rosin ester resin as a tackifier resin (Arakawa Chemical Industries, Ltd., Superester A115, softening point 1)
15 ° C.) and 2 parts of a melamine-based cross-linking agent (cross-linking agent C, manufactured by YAS Co., Ltd.) were mixed to obtain an acrylic pressure-sensitive adhesive composition.

<Production of Pressure-Sensitive Adhesive Tape> The acrylic pressure-sensitive adhesive composition was applied on the light release surface of the release sheet by 15 μm.
m (after drying) with a comma coater, dried at 100 ° C. for 3 minutes, and then wound up in a roll shape so as to be bonded to the heavy release surface side. 6mm width or 25mm to store in
Slitting was performed to obtain a pressure-sensitive adhesive tape.

Example 2 Terpene phenol resin (manufactured by Yashara Chemical Co., Ltd.) instead of the tackifier resin (Superester A115)
A pressure-sensitive adhesive tape was obtained in the same manner as in Example 1, except that 30 parts of YS Polystar T145 (softening point 145 ° C) was used.

Example 3 The pressure sensitivity was the same as in Example 1 except that 5 parts of an isocyanate-based crosslinking agent (Coronate L, manufactured by Nippon Polyurethane Co., Ltd.) was used instead of the melamine-based crosslinking agent (Crosslinking Agent C). An adhesive tape was obtained.

Comparative Example 1 A pressure-sensitive adhesive (Vinsol R-
A pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that 100 parts of 1500S) was mixed with 2 parts of a melamine-based crosslinking agent (crosslinking agent C) to obtain an acrylic pressure-sensitive adhesive composition. Was.

Comparative Example 2 An adhesive comprising an acrylic copolymer (Vinsol R-
1500S), except that 40 parts of a disproportionated rosin ester resin (Superester A115) and 2 parts of a melamine-based crosslinking agent (crosslinking agent C) were mixed with 100 parts of an acrylic pressure-sensitive adhesive composition. In the same manner as in Example 1, a pressure-sensitive adhesive tape was obtained.

Comparative Example 3 An adhesive comprising an acrylic copolymer (Vinsol R-
Acrylic pressure-sensitive adhesive composition was obtained by mixing 15 parts of disproportionated rosin ester resin (Superester A115) and 12 parts of melamine-based crosslinking agent (crosslinking agent C) with 100 parts of 1500S). In the same manner as in Example 1, a pressure-sensitive adhesive tape was obtained.

Comparative Example 4 An adhesive comprising an acrylic copolymer (Vinsol R-
1500S) 100 parts of disproportionated rosin ester resin (Arakawa Chemical Industry Co., Ltd., Superester A7)
5, a softening point of 75 ° C.) and a pressure-sensitive adhesive tape in the same manner as in Example 1 except that 30 parts of a melamine-based crosslinking agent (crosslinking agent C) was mixed to obtain an acrylic pressure-sensitive adhesive composition. Got.

Comparative Example 5 An adhesive comprising an acrylic copolymer (Vinsol R-
To 1500 parts of 1500S), 15 parts of an acrylic resin (manufactured by Mitsubishi Rayon Co., Ltd., Dianal BR-87, glass transition point 105 ° C, molecular weight 25,000) and 2 parts of a melamine-based crosslinking agent (crosslinking agent C) were mixed. Then, a pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that an acrylic pressure-sensitive adhesive composition was obtained.

Evaluation method (1) Initial adhesive strength The pressure-sensitive adhesive tape having a width of 25 mm obtained above was applied at 20 ° C.
After curing in a constant temperature and humidity room at 65% RH for 7 days, JI
According to SZ0237, a pressure-sensitive adhesive tape was stuck to a SUS304 steel plate, and after 20 minutes, the 180 ° peel strength was measured to evaluate the initial adhesive strength. The pulling speed is 300mm /
Minutes. Initial adhesive strength is 6.9-11.8N / 25mm
If so, it is determined to be good. Table 1 shows the results.

(2) Sharpness The pressure-sensitive adhesive tape having a width of 6 mm obtained above was treated at 20 ° C.
After curing for 7 days in a constant temperature and humidity room at 5% RH, it was stored in a commercially available transfer tool, and the transfer tool was PP-pressed at 8.8N.
After transferring the pressure-sensitive transfer layer by running while pressing against the C paper, as shown in FIG.
When pulled up at a speed of 00 mm / min, stringing 4 of the pressure-sensitive adhesive was generated, and the length L of the stringing when the thread was broken was measured, and the sharpness was determined based on the following criteria. Table 1 shows the results. ：: Length of stringing L ≦ 20 mm ×: Length of stringing L> 20 mm

(3) Storage stability The obtained pressure-sensitive adhesive tape having a width of 6 mm and a length of 20 m was stored in a constant temperature and humidity room at 50 ° C. and 90% RH for 96 hours, and then stored at 20 ° C. and 65% RH. , And stored in a commercially available transfer tool, the transfer tool was run on PPC paper to perform a transfer operation, and the storage stability was evaluated. When the pressure-sensitive adhesive tape was successfully transferred to the end without any problem,
When transfer was not completed to the last, it was judged as x. Table 1 shows the results.

[0044]

[Table 1]

[0045]

As is evident from the results in Table 1, when the transfer type pressure-sensitive adhesive tape of the present invention is stored in a transfer tool and transferred to an object to be transferred, such as a paper surface, the adhesive force and running property to the paper surface, etc. Excellent in sharpness and sharpness.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a hand-held transfer tool using the transfer type pressure-sensitive adhesive tape of the present invention.

FIG. 2 is an explanatory view showing a test method for evaluating the sharpness of the transfer type pressure-sensitive adhesive tape of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 transfer-type pressure-sensitive adhesive tape 2 base material 3 pressure-sensitive adhesive layer 4 stringing 10 supply reel 11 take-up reel 12 head 13 transferred object 14 transfer tool

Claims (2)

[Claims] 1. A supply reel in which a transfer-type pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on a substrate is wound in a roll shape, and the pressure-sensitive adhesive tape is rewound from the supply reel and supplied. Is used by being housed in a transfer tool comprising a head for transferring the pressure-sensitive adhesive layer by pressing the pressure-sensitive adhesive layer onto a transfer target body, and a take-up reel for winding the substrate separated from the pressure-sensitive transfer layer after transfer. In the transfer type pressure-sensitive adhesive tape, the pressure-sensitive adhesive layer is based on 100 parts by weight of the acrylic copolymer, and at least a softening point of 5 to 35 parts by weight of a tackifying resin having a range of 90 ° C to 160 ° C. A transfer-type pressure-sensitive adhesive tape, which is formed from a pressure-sensitive adhesive composition mixed with 0.5 to 10 parts by weight of a crosslinking agent. 2. The transfer-type pressure-sensitive adhesive tape according to claim 1, wherein the tackifying resin comprises a rosin-based resin and / or a terpene-based resin.