JP2000073021A - Adhesive tape - Google Patents

Abstract

[PROBLEMS] To provide an adhesive tape which can be easily rewound and does not require a release paper which can be printed by thermal transfer. A synthetic resin layer is provided on one side of a pressure-sensitive adhesive tape substrate, a glass transition point (Tg) of a synthetic resin as a main component of the synthetic resin layer is -20 ° C or less, and a contact angle (water And a solution in which the weight ratio of ethanol to ethanol is 1: 1
A pressure-sensitive adhesive tape having a dropping amount of 5 μl and measured after 60 seconds) of 25 to 70 ° and a pressure-sensitive adhesive layer provided on the other surface of the substrate. The peeling force between the pressure-sensitive adhesive layer and the synthetic resin layer is set to 5 to 400 gf / 25 mm. The pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive. The synthetic resin is at least one selected from polyisobutylene, butyl rubber, brominated butyl rubber, chlorinated butyl rubber, polyisoprene, polybutadiene, and ethylene-vinyl acetate copolymer. The synthetic resin layer contains pigment or silicone resin fine particles having an average particle diameter of 0.05 to 10 μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an adhesive tape. More specifically, the present invention relates to a pressure-sensitive adhesive tape that can be printed on a release layer by a thermal transfer ink ribbon and is easily rewound.

[0002]

2. Description of the Related Art Generally, a pressure-sensitive adhesive tape is provided with a pressure-sensitive adhesive layer on one side of a substrate, and a release agent is treated on the other side so that the pressure-sensitive adhesive tape can be rewound. For this reason, even if thermal transfer is performed with a general-purpose thermal transfer ink ribbon, the ink is not successfully transferred, and even if the ink is transferred, the ink easily falls off, making it virtually impossible to print.

[0003] For this reason, a heat transferable material, such as a label, usually has an ink receiving layer provided on the surface of a support and a release paper adhered to the back surface via an adhesive layer. Alternatively, the heat-sensitive recording label has a heat-sensitive coloring layer provided on the surface of the support and a release paper adhered to the back surface via an adhesive layer.

[0004] Although such labels are still widely used, more release paper that does not function as a product is required than a product label, and the release paper must be peeled off when attaching a label. Such a label that requires useless release paper not only has a problem that the product cost is high and the product is difficult to handle, but also has a problem that it adversely affects the natural environment.

[0005] In order to solve these drawbacks, a heat-sensitive label which does not require a release paper has been proposed. For example, a production method in which a release agent is applied to a printed surface as in JP-A-55-115483, or a thermosensitive coloring layer, a barrier layer, and a release layer on the surface of a support as in JP-A-3-169585. Some are provided sequentially. Also, Japanese Patent Application Laid-Open No. 9-279104
Japanese Patent Application Publication No. JP-A-2005-64131 provides a tack-free pressure-sensitive adhesive and a pressure-sensitive adhesive tape composed of a polyolefin on the back side.

[0006] However, Japanese Patent Application Laid-Open No. 55-115483.
In Japanese Patent Application Laid-Open Publication No. H08-157, printing is performed on a pre-printed material, so that printing is performed on a label surface differently from the format of printing on a label surface. In addition, Japanese Unexamined Patent Publication No.
In 169585, it is necessary to provide a heat-sensitive layer, and undesired color development due to heat before and after printing on a printer,
Alternatively, it has disadvantages such as many processing steps, and is completely different from the configuration of the present invention.

Japanese Patent Application Laid-Open No. 9-279104 uses a tack-free pressure-sensitive adhesive and has a self-adhesive property, but cannot be attached to another material. Further, there is a problem that the thermal transfer ink ribbon for printing on the above-mentioned adhesive tape is special and cannot be printed with a general-purpose ink ribbon.

That is, the release agent used in the conventional pressure-sensitive adhesive tape is used for protecting the pressure-sensitive adhesive layer and for facilitating the rewinding of the pressure-sensitive adhesive layer. Thermal transfer printing directly to the layer has been considered impossible.

[0009]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks and provides a synthetic resin layer made of a specific synthetic resin having both printability and releasability (hereinafter also simply referred to as a resin layer or a release layer). An object of the present invention is to provide a pressure-sensitive adhesive tape that can be easily unwound and does not require a release paper that can be printed by thermal transfer, by a combination of a pressure-sensitive adhesive and a pressure-sensitive adhesive.

[0010]

That is, in order to solve the above-mentioned problems, the present invention provides a pressure-sensitive adhesive tape substrate having a synthetic resin layer provided on one surface thereof, and a glass transition of a synthetic resin which is a main component of the synthetic resin layer. The point (Tg) is −20 ° C. or less, and the contact angle of the synthetic resin layer surface is 25 to 7 (measured after 60 seconds with a drop amount of 5 μl using a solution having a weight ratio of water to ethanol of 1: 1).
An object of the present invention is to provide a pressure-sensitive adhesive tape capable of thermal transfer printing, wherein the pressure-sensitive adhesive layer has a temperature of 0 ° and is provided with an adhesive layer on the other surface of the substrate.

The peeling force between the pressure-sensitive adhesive layer and the resin layer is 5 to 5.
It is preferably 400 gf / 25 mm, and is excellent in heat resistance and weather resistance required during thermal transfer printing and storage of an adhesive tape, and an acrylic adhesive is used in order to exhibit good releasability from the resin layer. Is more preferred.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The pressure-sensitive adhesive tape of the present invention is characterized in that a resin layer mainly composed of a specific synthetic resin is provided on one side of a base material and a pressure-sensitive adhesive layer is provided on the other side. .

[0013] In order to solve the above-mentioned problems, the present inventors diligently studied a material different from a conventional release agent which has releasability but cannot be printed on a release layer by thermal transfer. As a result, a resin layer mainly composed of a synthetic resin having a glass transition point (Tg) of −20 ° C. or less was provided on one surface of the substrate, and the contact angle of the resin layer surface (the weight ratio of water to ethanol was 1: 1). (E.g., after 30 seconds with a drop amount of 5 μl using the solution of No. 1), which is 25 to 70 degrees, and the adhesive tape is easily rewound by providing an adhesive layer on the other surface of the substrate. In addition, the present inventors have found that an adhesive tape having excellent heat transfer printability on the back surface of the adhesive tape and excellent heat resistance can be obtained, and the present invention has been completed.

In the present invention, the resin layer has heat transfer printability, exhibits releasability, and is excellent in heat stability as an adhesive tape (heavy peeling by heat treatment, for example, heavy peeling of tape unwinding force). ), A synthetic resin having a glass transition point in a specific range is used as a main component, and a contact angle of a resin layer provided on the back surface of the adhesive tape is in a specific range.

That is, if the glass transition point involved in the deformation of the resin layer during the thermal transfer of the ink is too high, the deformation of the resin layer is difficult, so that the adhesion between the ink and the resin layer is inferior, and the ink is liable to be missing during the transfer. That's why. Here, the glass transition point (Tg) can be experimentally determined by DSC (differential thermal scanning calorimeter), and can be calculated from the glass transition point (polymer handbook) of each homopolymer described in the literature by the Fox equation. (1 / Tg = Σwi / Tgi, where wi represents the weight fraction of each component, and Tgi represents the glass transition point of each component).

On the other hand, it is considered that one of the characteristics which influences the releasability (peelability from the pressure-sensitive adhesive) is the contact angle. If the contact angle is too high, the releasability between the pressure-sensitive adhesive layer and the resin layer is excellent but the surface is excellent. Since the tension is reduced, the transfer of the ink becomes difficult. Conversely, if the contact angle is too low, the releasability between the pressure-sensitive adhesive layer and the resin layer is lost, and it becomes difficult to rewind the pressure-sensitive adhesive tape, and as a result, it cannot be used as a tape.

Further, it is presumed that the reason why the resin layer of the present invention exhibits both the releasability and the printability is also related to the elastic modulus of the synthetic resin as the main component. That is, the difference between the storage elastic modulus (G ′) and the loss elastic modulus (G ″) around room temperature obtained by the dynamic viscoelasticity measuring device is compared with the G ′ of the synthetic resin that is the main component of the resin layer of the present invention. G "difference (A)
Is the difference (B) between G 'and G "of an adhesive (or plastic or the like) having good ink ribbon adhesion but poor release properties, and G' of a release agent having good release properties but poor ink ribbon adhesion. Between G ”and G” (C)
>(A)> (B)), it is estimated that they exhibit intermediate properties between the two. Incidentally, as an example of the synthetic resin of the present invention, polyisobutylene (VIEX manufactured by Tonex Corporation) is used.
STANEX MML-100) frequency 1 Hz, 22
The difference between the storage elastic modulus (G ′) and the loss elastic modulus (G ″) at ° C. (here represented by G ′ / G ″) is 1 × 10 to 9 × 10.
It is. Silicone cured product (Toray Dow Corning Co., Ltd.)
G ′ / G ″ under the same conditions as SD-7220) is 1 ×
100 to 9 x 100, general adhesive (rubber-based)
G ′ / G ″ under the same conditions is 1 to 1 × 10.

The synthetic resin as a main component forming the resin layer having excellent heat transfer properties, releasability and heat resistance stability of the pressure-sensitive adhesive tape is not particularly limited as long as it is within the range defined in claim 1. For example, polyisobutylene, butyl rubber, brominated butyl rubber, chlorinated butyl rubber, polyisoprene, polybutadiene, ethylene-vinyl acetate copolymer and the like can be used, and further, polyisobutylene and polyisoprene, polyethylene, polyester, polypropylene, ethylene -A polymer blended or copolymerized with a vinyl acetate copolymer or the like can also be used.

For example, commercially available products of the above polyisobutylene include “VISTANEX” manufactured by Tonex Corporation.
LMMH "," VISTANEX MML-80 ",
"VISTANEX MML-100", "VISTA
NEX MML-120 "," VISTANEX MM
L-140 "and the like, and commercially available products of butyl rubber and brominated butyl rubber include" Exxon butyl 065 "," 268 "," 365 "," Exxon bromobutyl 2244 ", and" Exxon bromobutyl 2244 "manufactured by Nippon Butyl Co., Ltd. 2255 "and commercially available ethylene-vinyl acetate copolymers include" AD-1790-15 "manufactured by Toyo Morton.

As the synthetic resin having the above-mentioned specific properties, a synthetic resin alone or a resin obtained by adding pigment or silicone resin fine particles to a synthetic resin is used. The pigment or silicone resin fine particles to be added have a particle size of 0.05 to 5 μm.
belongs to. These pigments or silicone resin fine particles are used for suppressing blocking between the resin layer and the substrate, and among them, calcium carbonate or silica or silicone resin fine particles are more preferable. Particle size 0.05
When the particle size is less than μm, the blocking inhibitory effect may be small or, for example, when a product having a high transparency is required, such as an over-laminated product using a film substrate, it is not preferable because a decrease in transparency is observed. , Particle size is 5μm
Exceeding the range is not preferred because the unevenness of the resin layer may make it difficult for the ink layer of the ink ribbon to stick.

The type of the pigment or the fine particles of the silicone resin is properly used depending on the required quality. For example, silicone resin fine particles having a large particle diameter are particularly preferably used for those requiring a transparent pressure-sensitive adhesive tape, and silica is preferably used especially for an ink ribbon using a wax-based resin. In order to suppress the influence (transfer) on the adhesive, calcium carbonate having a particularly small particle size is suitably used.

When these pigments or silica or silicone fine particles are added, the amount of addition is 3 to maintain the suitability for thermal transfer printing or to reduce the transfer to the adhesive.
It is preferably 0% by weight or less. If the amount of the pigment or silicone fine particles is too large, the smoothness of the resin layer of the present invention is reduced and ink transferability is poor, or these additives migrate to the adhesive surface, and the original adhesive performance of the adhesive. This is because there is a case where is reduced.

Commercial products of such pigments include “Mizukasil P-526” and “Mizukasil P-527” manufactured by Mizusawa Chemical Co., Ltd.
"P-801", "P-603", "P-60"
4, "P-554A", "Fine Seal A", "E-50", "E-70", "X-37", "X-37B", "X-37B", manufactured by Tokuyama Corporation "X-45", "K-41", "RX-70", Kamishima Chemical Industry Co., Ltd. "Star brand light calcium carbonate EC", "K
FW-200 "," Brilliant-1 "manufactured by Shiraishi Industry Co., Ltd.
5, "S15", Toshiba Silicone Co., Ltd. "Tospearl 105", "120", "130", "14"
5 "and the like.

Further, the resin layer may have a controlled peeling force or a surface property (eg, wettability, blocking property, surface strength).
May be added to control the viscosity. However, in order to maintain proper thermal transfer printability, it is preferable that the amount of the auxiliary agent such as silicone or wax is 20% by weight or less.

In the present invention, the peeling force between the resin layer and the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape is 5 to 400 gf / 25 mm in order to easily rewind the pressure-sensitive adhesive tape and smoothly pass the pressure-sensitive adhesive tape through a thermal transfer printer. Is preferable. If it is less than 5 gf / 25 mm, the adhesive tape may be unwound more than necessary when it is rewound.
If it exceeds 0 gf / 25 mm, it may not be possible to smoothly pass through the printer for thermal transfer, or if the peeling force further increases, it may be difficult to rewind the adhesive tape.

The synthetic resin as the main component of the resin layer is dissolved in a solvent having a similar solubility parameter (SP value), for example, a single or mixed organic solvent such as toluene, MEK (methyl ethyl ketone), or xylene, and then coated and dried. . The coating amount of the synthetic resin is preferably 0.1 to 10 g / m ² ,
0.4-5 g / m < ² > is more preferable. The coating amount of the resin layer containing the synthetic resin as a main component and the peeling force are in inverse proportion, and the peeling force tends to increase as the coating amount decreases and decrease as the coating amount increases. If the coating amount is less than 0.1 g / m ² , uniform release performance between the pressure-sensitive adhesive tape and the synthetic resin layer may not be obtained, and it is difficult to easily rewind the pressure-sensitive adhesive tape, which is the object of the present invention. On the other hand, if it exceeds 10 g / m ² , the peeling force can be reduced, but it is not preferable because stickiness (blocking) of the resin layer may be deteriorated.

The method of applying the synthetic resin is not particularly limited, and examples thereof include a gravure direct method, a gravure reverse method, a bar coating method, and a roll coating method. The temperature at which the resin solution is dried depends on the amount of application and the drying device, but is preferably 40 to 140 ° C.

The kind of the pressure-sensitive adhesive is not particularly limited, but it is preferable to use an acrylic pressure-sensitive adhesive in order to facilitate peeling from the synthetic resin layer. EA), butyl acrylate (BA), 2-ethylhexyl acrylate (2-EHA), vinyl acetate (V
Ac), acrylonitrile (AN), styrene (S
t), methyl methacrylate (MMA), methyl acrylate (MA), methacrylic acid (MAA), acrylic acid (AA), itaconic acid (I
A), hydroxyethyl methacrylate (HEMA),
Hydroxypropyl methacrylate (HPMA), dimethylaminoethyl methacrylate (DM), acrylamide (AM), methylol acrylamide (NM)
AN), glycidyl methacrylate (GMA), maleic anhydride and the like as main components (preferably 80% by weight or more). If necessary, a tackifier, an ultraviolet absorber, a cross-linking agent, a pigment, aging Additives such as inhibitors are blended.

The amount of the pressure-sensitive adhesive to be applied is appropriately selected depending on the type and thickness of the substrate to be used.
0 g / m ² is preferable, and more preferably 5 to 60 g / m ²
m ² . When the coating amount is less than 5 g / m ² , the adhesive strength when sticking the pressure-sensitive adhesive tape to another adherend may decrease, and when it exceeds 80 g / m ² , the anchoring property of the pressure-sensitive adhesive may decrease. In some cases, the adhesive may protrude from the end of the tape or the adhesive may remain on the adherend.

The method of applying the pressure-sensitive adhesive is not limited at all, and examples thereof include a comma coating method, a reverse coating method, a gravure coating method, a reverse gravure method, a kiss coating method, a knife coating method, a bar coating method and a process paper. And a transfer method of transferring a material coated by a method.

[0031]

EXAMPLES The present invention will be described in more detail with reference to the following examples, which, of course, are not intended to limit the present invention. In the Examples and Comparative Examples, “parts” and “%” indicate “parts by weight” and “% by weight” unless otherwise specified.

Example 1 Fine paper (Uji Paper, U-7: 64 g / m ² ) was used as a base material, and 40 parts of SBR (L-1571, Ricabond ET-84) and kaolin (Engel) were formed on one surface of the base material. Made of hardware, H
T clay) 60 parts, Nopco 1407K (manufactured by San Nopco)
0.5 parts, Nopcoat C104 (manufactured by San Nopco) 0.5
The sealing layer was formed so that the coating amount was 6 g / m ² . As the resin layer, polyisobutylene (glass transition point: measured value −65.3 ° C., manufactured by Tonex Corporation)
ISTANX MML-100: viscosity average molecular weight 80
90 to 90 parts of silicone resin fine particles (TOSHIBA Silicone Tospearl 120, average particle size 2)
μm), and kneaded with a kneader for 15 minutes. Then, a kneaded mixture of polyisobutylene and silicone resin fine powder was dissolved with toluene, and a well-stirred mixed solution was used as a release agent coating solution. Coating and drying on the filling layer to 1.5 g / m ² , resin layer (release layer)
I got

Next, 2-ethylhexyl acrylate 7 was used as an adhesive to be applied to the surface opposite to the surface provided with the resin layer.
An acrylic pressure-sensitive adhesive (BPS-5569, manufactured by Toyo Ink Co., Ltd.) consisting of 0 parts, 28 parts of vinyl acetate, and 2 parts of acrylic acid was applied and dried so as to have a solid content of 30 g / m ^2. did.

Example 2 A biaxially oriented polypropylene film (Oji Paper Co., Ltd.
PU-102, 40 μm) and polyisobutylene (measured glass transition point: −65.3 ° C., VISTANEX MML-10 manufactured by Tonex Corporation) as a resin layer
0: 85 parts of viscosity average molecular weight of 80,000 to 100,000), 10 parts of silicone resin microparticles (Tospearl 120 manufactured by Toshiba Silicone, average particle size 2 μm) are added, kneaded with a kneader for 15 minutes, and then mixed with polyisobutylene and silicone resin fine powder. The kneaded mixture was dissolved in toluene to prepare a mixed solution, and further 5 parts of silicone (SD-7220 manufactured by Toray Dow Corning) was added and stirred, and then a silicone catalyst (SRX-212 manufactured by Toray Dow Corning) was added.
The mixed solution further mixed well was used as a release agent coating solution, and this was applied onto one surface of the base material at a solid content of 0.5 g /
It was coated and dried to obtain m ^2, and a resin layer (release layer) was obtained.

Next, the same adhesive tape as in Example 1 was applied to the surface opposite to the surface provided with the resin layer, except that the same acrylic pressure-sensitive adhesive as in Example 1 was applied and dried so as to have a solid content of 10 g / m ^2. I got

Example 3 A biaxially oriented polypropylene film (manufactured by Oji Paper Co., Ltd.)
PU-102, 40 μm) and polyisobutylene (measured glass transition point: −65.3 ° C., VISTANEX MML-10 manufactured by Tonex Corporation) as a resin layer
0: 80 parts of viscosity average molecular weight of 80,000 to 100,000) and 5 parts of silicone resin fine particles (Tospearl 120, manufactured by Toshiba Silicone, average particle size of 2 μm) were added to the mixture, and 1 part was kneaded.
After kneading for 5 minutes, the kneading mixture of the polyisobutylene and the silicone resin fine powder was mixed with an ethylene-vinyl acetate copolymer (EVA) (measured value of glass transition point: -39.7 ° C,
10 parts of Toyo Morton Co., Ltd.) was dissolved in toluene in the same container to prepare a mixed solution, and 5 parts of silicone (SD-7220, manufactured by Toray Dow Corning) was added to the mixed solution and stirred. (Toray Dow Corning SRX-212) (0.05 parts) was added, and the mixed solution further stirred well was used as a release agent coating liquid.
g / m ² , coated and dried to form a resin layer (release layer)
I got

Next, the same adhesive tape as in Example 1 was applied to the surface opposite to the surface provided with the resin layer, except that the same acrylic pressure-sensitive adhesive as in Example 1 was applied and dried so as to have a solid content of 10 g / m ^2. I got

Example 4 A biaxially oriented polypropylene film (made by Oji Paper Co., Ltd.)
PU-102, 40 μm) and polyisobutylene (measured glass transition point: −65.3 ° C., VISTANEX MML-10 manufactured by Tonex Corporation) as a resin layer
0: Viscosity average molecular weight of 80,000 to 100,000), 60 parts of silicone resin fine particles (Tospearl 120 made by Toshiba Silicone, average particle size: 2 μm), 10 parts, kneading with a kneader for 15 minutes, and mixing of polyisobutylene and silicone resin fine powder. Kneading mixture and ethyl cellulose (glass transition point 43 ° C, Tokyo Chemical Industry Co., Ltd., 45-55 cps
20 parts of 5% in Toluen + Ethanol (80:20) Sol.at 25 ° C.) was dissolved in toluene in the same vessel to prepare a mixed solution, and silicone (SD manufactured by Toray Dow Corning Co., Ltd.) was added to the mixed solution.
After adding and stirring 10 parts of a silicone catalyst (SRX-212 manufactured by Dow Corning Toray Co., Ltd.), the mixed solution further stirred well was used as a release agent coating solution, and this was used as a solid content of 0%. Coating and drying were performed to obtain a resin layer (release layer) of 0.5 g / m ² .

Next, the same adhesive tape as in Example 1 was applied to the surface opposite to the surface provided with the resin layer, except that the same acrylic pressure-sensitive adhesive as in Example 1 was applied and dried so as to have a solid content of 10 g / m ^2. I got

Example 5 As a substrate, polyethylene laminated kraft paper (Melami
Uncle pack 73g / m ^Two20μm polyethylene foil
Film laminated)) and use it as a resin layer.
Chill rubber (Measured value of glass transition point: -66.7 ° C,
Chill exon butyl 268) 90 parts of calcium carbonate
5 parts (Brilliant 15 manufactured by Shiraishi Industry Co., Ltd.)
After kneading for 15 minutes with
Prepare a mixed solution, and add silicone (East
Add 5 parts of Redw Corning SD-7220) and stir
After that, a silicone catalyst (S Toray Dow Corning S)
RX-212) was added and stirred well.
The mixed solution was used as a release agent coating liquid, and the solid content was 1.5 g /
m^TwoLayer (release layer) obtained by coating and drying so that
An adhesive tape was prepared in the same manner as in Example 1 except that
Was.

Comparative Example 1 Kraft paper (melamine clupak 73 g / m
² ) As a resin layer, polyethylene (glass transition point -12)
(5 ° C.) to produce a pressure-sensitive adhesive tape in the same manner as in Example 1 except that a laminate obtained by extruding and laminating the film to a uniform thickness of 20 μm was used.

Comparative Example 2 As a resin layer, 100 parts of polyester (glass transition point: 4 ° C., manufactured by Toyobo Co., Ltd., Byron 53SS) was dissolved in toluene as a solvent, and this was coated to a solid content of 1.0 g / m ^2. An adhesive tape was produced in the same manner as in Example 1, except that a resin layer (release layer) obtained by drying was used.

Comparative Example 3 A biaxially oriented polypropylene film (made by Oji Paper
PU-102, 40 μm) and silicone (SD-7220 manufactured by Dow Corning Toray) as a resin layer 100
Was dissolved with toluene as a solvent, and the solid content was 0.5
g / m ² , coated and dried to form a resin layer (release layer)
I got Then, on the surface opposite to the surface provided with the resin layer,
A pressure-sensitive adhesive tape was obtained in the same manner as in Example 1, except that the same acrylic pressure-sensitive adhesive as in Example 1 was applied and dried so as to have a solid content of 10 g / m ² .

The pressure-sensitive adhesive tapes obtained in the above Examples and Comparative Examples were evaluated by the following methods, and the results are shown in Table 1.

The left <Residual adhesion ratio> the peeling layer surface of each adhesive tape was adhered an adhesive tape (Nitto 31B), since in close contact with the rubber roll, and a load of 25 g / cm ² 7
After leaving at 0 ° C. for 20 hours, the adhesive tape was peeled off from the release layer surface, left at room temperature for at least 1 hour, then adhered to the polished surface of a stainless steel plate, and peeled at 180 ° at 0.3 m / min. Adhesive tape (Nitto 31B) is applied to the force (A) and the Teflon sheet, adhered with a rubber roll, left at 70 ° C. for 20 hours while applying a load of 25 g / m ² , and then the adhesive tape was removed from the release layer surface. Peel off the
After leaving at room temperature for 1 hour or more, it was stuck on the polished surface of a stainless steel plate, and the adhesive strength (B) when peeled at 180 m at a rate of 0.3 m / min was measured, and the ratio of (A) to (B) ( A / B)
× 100 = residual adhesion rate (%).

<Back Peeling Force> The pressure-sensitive adhesive layer surface of the pressure-sensitive adhesive tape is adhered to the peeling layer surface according to JIS Z 0237.
After one minute, the 180 ° peel force was measured by a tensile tester at 0.3 m / min.

<Printability> The thermal transfer printer is a DAT
AMAX barcode label printer [Prodi
gy Plus Linerless] and a commercially available wax-based ink ribbon (product name: FT
R, obtained from Kanematsu Martec Co., Ltd.) and a resin ink ribbon (product name: FSR, obtained from Kanematsu Martec Co., Ltd.), barcode printed on the release layer surface of the adhesive tape while automatically unwinding the adhesive tape. Printability was evaluated according to the following criteria.

A: The transferability of the ink at the time of printing is clear, and there is almost no peeling of the ink even when the mending tape is applied to the printing surface and peeled off. O: The transferability of the ink at the time of printing is clear, but There is a slight peeling of the ink when the mending tape is applied and peeled off (usable for practical use) △: The transferability of the ink during printing is slightly faint, and the ink is peeled off slightly when the mending tape is applied and peeled off. There is (the limit of practical use) ×; <Situation> The transferability of the ink at the time of printing is slightly faint, and the peeling of the ink occurs when the printing surface is peeled off with a mending tape (unusable for practical use) <Situation> The transferability of the ink during printing is faint, and when the mending tape is applied to the printing surface and peeled off, the ink is slightly peeled off (practically unusable). There is no transfer property

<Printer Runnability> A bar code label printer manufactured by DATAMAX [Prodigy Plus]
Using a commercially available wax-based ink ribbon or a resin-based ink ribbon as the ink ribbon, the running property of the adhesive tape when barcode printing was performed on the release layer surface of the adhesive tape while automatically unwinding the adhesive tape was evaluated. ○: Unwinding is smooth and stable, and the printer runs stably. △: Unwinding is slightly unstable, but running the printer without practical problems. X: Unwinding is unstable, and running the printer is difficult.

<Heat resistance> Regarding the heat resistance of the pressure-sensitive adhesive tape, the pressure-sensitive adhesive layer surface of the pressure-sensitive adhesive tape was stuck to the release layer surface of the obtained pressure-sensitive adhesive tape, and the pressure-sensitive adhesive tape was applied under a load of 25 g / m ^2.
After leaving for 1 day in an environment of 0 ° C., the peeling force (a) when the adhesive tape was peeled 180 ° from the surface of the peeling agent layer at 0.3 m / min was measured, and peeling from the back surface peeling force (b) was measured. The rate of increase in force {((a)-(b)) / (b)) × 100} was determined and evaluated as follows. ◎: The increase rate is in the range of 0 to 80% ○: The increase rate is in the range of 81 to 150% △: The increase rate is in the range of 151 to 200% ×: The increase rate is 200% Exceed

[0051]

[Table 1]

As is clear from Table 1, Examples 1 to 5
In the configuration of the present invention as described above, the thermal transfer printability with a general-purpose ink ribbon was excellent, the peeling between the release layer and the pressure-sensitive adhesive layer was smooth, and the heat resistance was excellent.

In Comparative Example 1, the printability with the wax-based ink ribbon was almost good, but the printability with the resin-based ink ribbon was insufficient and the heat resistance was poor. In Comparative Example 2, the printability was poor and the peeling force of the back surface was very high, so that the unwinding of the pressure-sensitive adhesive tape was not smooth, and the running property of the printer was unstable. Further, when the pressure-sensitive adhesive tape of Comparative Example 2 was heat-treated, the pressure-sensitive adhesive tape could not be unwound. In Comparative Example 3, the unwinding of the adhesive tape was very smooth, but there was no printability.

[0054]

With the release agent used in the conventional pressure-sensitive adhesive tape, it has been impossible to thermally transfer a general-purpose ink ribbon directly to the release layer. According to the present invention, it is possible to perform thermal transfer printing using a general-purpose ink ribbon while maintaining the performance as a conventional pressure-sensitive adhesive, without the need for a release paper that has been wasted until now, and stable printer runnability. In addition, it is possible to provide a pressure-sensitive adhesive tape having excellent heat resistance, thereby making it possible to innovatively advance conventional label products and greatly contributing to the industry.

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 2H111 AA01 AA14 AA16 AA26 BA03 BA08 BA09 BA35 BA53 BA61 BA63 BA71 4J004 AA10 AB01 CA02 CA04 CA06 CA07 CB02 CC03 CC05 DA04 DB01 DB03 EA01 FA01

Claims (5)

[Claims] A synthetic resin layer is provided on one side of a pressure-sensitive adhesive tape base material, and a glass transition point (Tg) of a synthetic resin as a main component of the synthetic resin layer is -20 ° C. or less, and a contact angle of the synthetic resin layer surface (Tg). Using a solution in which the weight ratio of water to ethanol is 1: 1;
A heat transfer printable adhesive tape characterized by having an adhesive layer provided on the other surface of the substrate at a dropping amount of 5 μl and measured after 60 seconds) of 25 to 70 °. 2. The peeling force between the pressure-sensitive adhesive layer and the synthetic resin layer is 5-4.
The heat transfer printable pressure-sensitive adhesive tape according to claim 1, wherein the pressure-sensitive adhesive tape has a thickness of 00 gf / 25 mm. 3. The pressure-sensitive adhesive tape according to claim 1, wherein the pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive. 4. The synthetic resin is at least one selected from polyisobutylene, butyl rubber, brominated butyl rubber, chlorinated butyl rubber, polyisoprene, polybutadiene, and ethylene-vinyl acetate copolymer. The heat transfer printable pressure-sensitive adhesive tape according to any one of the above items. 5. The synthetic resin layer has an average particle size of 0.05 to 10 μm.
The heat transfer printable pressure-sensitive adhesive tape according to any one of claims 1 to 4, wherein the pressure-sensitive adhesive tape contains m pigments or silicone resin fine particles.