JP7187026B2 - pressure sensitive transfer adhesive tape - Google Patents

Description

The present invention relates to a pressure-sensitive transfer adhesive tape that can be pressed against a paper surface or the like by a hand-held transfer tool to transfer an adhesive layer to an adherend such as a paper surface, thereby gluing the adherends together.

One of the double-sided tapes is the non-supported double-sided adhesive tape that does not have a support (core material) and transfers the adhesive layer to the adherend, and is used in various fields and applications as a pressure-sensitive transfer adhesive tape. It is Most of them have a structure in which a pressure-sensitive adhesive layer is provided on one side of a release base material and wound into a roll. Recently, as an adhesive for papers mainly for office use, a roll of pressure-sensitive transfer adhesive tape cut into a predetermined width and rolled into a pancake shape (hereinafter abbreviated as "pancake") ) is mounted on a transfer device and is marketed under the name of "tape paste".

This transfer tool includes a delivery reel on which the pancake is attached, a transfer head that transfers the adhesive layer of the pressure-sensitive transfer adhesive tape supplied from the delivery reel to the adherend while peeling it from the release base material, and after transfer use. It is characterized in that a winding reel for winding the remaining peeling base material is installed in the body so that it can be held and used with one hand. Unlike liquid glue and solid glue, which have been commonly used to adhere paper, these adhesive layers can be easily transferred to the adherend without getting your hands dirty, and there is no need for drying time before adhesion. and that the paper to be adhered does not wrinkle.

When the pressure-sensitive transfer adhesive tape is attached to a transfer tool and transferred to an adherend such as paper, the adhesive layer of the pressure-sensitive transfer adhesive tape (hereinafter , "glue tearability") is poor, a phenomenon in which threads are drawn occurs between the adhesive layer transferred to the paper surface and the adhesive layer on the transfer tool side, which interferes with the transfer work. was there.

Therefore, in the prior art, in order to improve the adhesive layer tearability of the pressure-sensitive transfer adhesive tape, studies have been made on forming the adhesive layer in a pattern on the release substrate (see Patent Document 1, etc.). However, when a patterned adhesive layer is used, the ratio of the adhesive layer on the release substrate decreases, and various performances (adhesiveness, curved surface adhesiveness, transferability, etc.) of the pressure-sensitive transfer adhesive tape deteriorate. .
Further, since the pressure-sensitive transfer adhesive tape is in a roll state, the adhesive layer and the release layer on the back side of the base material on the inner side of the circumference are in contact with each other. In the pressure-sensitive transfer adhesive tape, since the adhesive part is also provided on the surface of the release layer of the base material, unlike general adhesive tapes that do not have peelability on the adhesive part side of the base material, it can be transferred from the roll state to high speed. When the transfer adhesive tape is unwound in , the adhesive may migrate to the release layer on the back side (hereinafter referred to as "blocking"). In particular, when the pressure-sensitive adhesive layer is a discontinuous pattern-like pressure-sensitive adhesive layer, blocking is likely to occur.

JP 2006-206657 A

In view of the above-mentioned problems, the present invention provides a pressure-sensitive transfer adhesive tape that is excellent in curved surface adhesiveness without impairing adhesiveness, blocking resistance, and transferability, while improving adhesiveness by a patterned adhesive layer. The task is to provide

The present inventors have made intensive studies on the adhesive layer of the pressure-sensitive transfer adhesive tape, and found that the adhesive layer has an acrylic copolymer and a softening point of 120 to 170° C. even when the adhesive layer is patterned. The inventors have found that a pressure-sensitive transfer adhesive tape that can solve the above problems can be obtained by using an isocyanate compound and a metal chelate compound as a tackifying resin and a cross-linking agent in the range of , and arrived at the present invention.

That is, the present invention is as follows.
1) A pressure-sensitive transfer adhesive tape in which an adhesive layer is patterned on a release base material having release layers on both sides of paper or a plastic film,
The pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is a pressure-sensitive adhesive obtained by mixing an acrylic copolymer, a tackifying resin having a softening point of 120 to 170 ° C., and an isocyanate compound and a metal chelate compound as a cross-linking agent. pressure-sensitive transfer adhesive tape.
2) The pressure-sensitive transfer adhesive tape according to 1) above, wherein the metal chelate compound is an aluminum chelate compound or a titanium chelate compound.
3) The pressure-sensitive transfer adhesive tape according to 1) or 2) above, wherein the adhesive has a gel fraction of 35 to 60%.
4) The pressure-sensitive transfer adhesive tape according to any one of 1) to 3) above, wherein the amount of the cross-linking agent mixed is less than 0.5 parts by weight per 100 parts by weight of the acrylic copolymer.
5) The tackifying resin is terpene phenol resin, aromatic modified terpene resin, aromatic modified terpene resin hydride, rosin ester resin, polymerized rosin ester resin, hydrogenated petroleum resin, aliphatic petroleum resin, aromatic petroleum resin , aliphatic/aromatic copolymer petroleum resins, coumarone-indene resins, rosin-modified xylene resins, rosin-modified phenolic resins and acrylic resins. The pressure-sensitive transfer adhesive tape according to any one of 1.
6) The pressure-sensitive transfer adhesive tape according to any one of 1) to 5) above, wherein the pressure-sensitive adhesive portion area ratio per unit area on the release substrate is 15 to 98%.

According to the present invention, it is possible to provide a pressure-sensitive transfer adhesive tape that is excellent in curved surface adhesiveness without impairing adhesiveness, blocking resistance, and transferability while improving adhesiveness by a patterned adhesive layer. can.

An example of a discontinuous coating pattern in which the pressure-sensitive adhesive layer is arranged in circular dots. An example of a discontinuous coating pattern in which the pressure-sensitive adhesive layer is arranged in rectangular blocks. An example of a discontinuous coating pattern in which the pressure-sensitive adhesive layer is arranged in the shape of rhombic dots. An example of a discontinuous coating pattern in which the adhesive layer is arranged in wavy stripes. An example of a discontinuous coating pattern in which the pressure-sensitive adhesive layer is arranged in diagonal stripes. An example of a continuous coating pattern in which the pressure-sensitive adhesive layer is arranged in a mesh pattern. An example of a continuous coating pattern in which the pressure-sensitive adhesive layer is arranged in a mesh pattern. An example of a continuous coating pattern in which the pressure-sensitive adhesive layer is arranged in a mesh pattern.

The present invention will be described in detail below.
The pressure-sensitive transfer adhesive tape of the present invention is a pressure-sensitive transfer adhesive tape in which a continuous or discontinuous pattern of an adhesive layer is formed on a release base material. The release substrate is formed by coating a release agent on both sides of a paper or plastic film (substrate) to form a release layer. A silicone resin or the like is used.

As the base material used for the release base material, paper or plastic film having bending rigidity suitable for a transfer tool having an automatic winding mechanism is used. Examples of the paper include glassine paper and the like. Examples of plastic films include polyester films such as polyethylene terephthalate and polyolefin films such as polypropylene and polyethylene. The thickness of these substrates is preferably 3 to 50 μm in terms of transferability and cost.

The pressure-sensitive transfer adhesive tape of the present invention is obtained by pattern-coating an adhesive onto a release substrate. The area ratio of the adhesive part per unit area on the release base material is preferably set in the range of 15 to 98% from the viewpoint of achieving both adhesiveness and cutability. If it is less than 15%, the force for fixing papers is weak, while if it exceeds 98%, the adhesive cutting property is deteriorated. Considering the balance between adhesiveness and severability, it is desirable to set the adhesive portion area ratio per unit area to 30 to 90%, more preferably 50 to 90%.

The thickness of the pressure-sensitive adhesive layer is preferably in the range of 5 to 50 μm in order to ensure sufficient adhesiveness after the adherend has been bonded for a long period of time. More preferably, it is in the range of 5-40 μm. This adhesive layer may be formed as a continuous pattern or may be formed as a discontinuous pattern. Incidentally, the continuous pattern means a pattern in which the adhesive layer is arranged on the release base material in a range of 15 to 98% area ratio so that the adhesive layer is not interrupted. A discontinuous pattern refers to a pattern having independent adhesive portions in which the adhesive layer is arranged at intervals on the release substrate in the range of 15 to 98% area ratio of the adhesive portions.

As a specific coating pattern, for example,
a) Discontinuous patterns in which circular, oval, triangular, square, rectangular, rhombic, hexagonal, etc. are arranged in the form of fine dots or blocks (for example, FIGS. 1, 2, and 3) for the pressure-sensitive adhesive layer;
b) a discontinuous pattern in which lines such as straight lines or wavy lines are arranged in vertical, horizontal, or diagonal stripes (e.g., FIGS. 4 and 5);
c) a continuous pattern in which the pressure-sensitive adhesive layer is arranged in a mesh pattern (for example, FIGS. 6, 7, and 8);
and modified patterns thereof. The size (area), length and width of various patterns are not particularly limited. In each figure, 1 is a pressure-sensitive transfer adhesive tape, 2 is a release base material, 3 is an adhesive layer (adhesive portion), and 4 is a non-adhesive portion.
Any pattern combination method may be used. For example, a combination of pressure-sensitive adhesive layers having the same shape pattern with different sizes (areas), a pressure-sensitive adhesive layer having circular dots or blocks and a striped pressure-sensitive adhesive layer. A combination of agent layers and the like can be mentioned.

In the present invention, the coating pattern of the above group a) and the coating pattern of the group c) are preferable from the viewpoint of achieving good adhesiveness even when the coating area ratio is set high. In the case of the coating pattern of group a), the area of one dot (block) is preferably 8 mm ² or less, more preferably 6 mm ² or less, and even more preferably 4 mm ² or less. In the case of the coating pattern of group c), it is preferable that the area of the crossing point of the mesh is larger than that of the line part of the mesh, and the area of the crossing point is preferably 8 mm ² or less, more preferably 6 mm ² or less. , more preferably 4 mm ² or less. The thickness of the pressure-sensitive adhesive layer at the intersections of the mesh may be greater than the thickness at the line portions of the mesh.

As the pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer, an acrylic pressure-sensitive adhesive is used from the viewpoint of excellent coatability. As the acrylic pressure-sensitive adhesive, one containing an acrylic copolymer obtained by copolymerization of various acrylic acid ester monomers and optionally blended copolymerizable monomers as a main component is preferably used.

Examples of acrylic acid ester monomers include alkyl acrylates such as methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, cyclohexyl acrylate, and benzyl acrylate, butyl methacrylate, and methacrylic acid. Methacrylic acid alkyl esters such as 2-ethylhexyl acid, cyclohexyl methacrylate, and benzyl methacrylate are used, and these acrylic acid ester monomers are used alone or in combination of two or more.

A monomer having a functional group is preferably used as the copolymerizable monomer to be copolymerized with the acrylic acid ester monomer. For example, carboxyl group-containing monomers such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) ) acrylates, N-methylol acrylamide, hydroxyl group-containing monomers such as allyl alcohol; tertiary amino group-containing monomers such as dimethylaminopropyl (meth) acrylate; acrylamide, N-methyl (meth) acrylamide, N-methoxymethyl (meth) N-substituted amide group-containing monomers such as acrylamide and N-octylacrylamide; epoxy group-containing monomers such as glycidyl methacrylate; Monomers having no functional group can also be appropriately copolymerized, and examples of monomers having no functional group include vinyl acetate, vinyl propionate, vinyl ether, styrene, acrylonitrile, and the like.

Commercially available acrylic copolymers include "Nisetsu" manufactured by Nippon Carbide Industry Co., Ltd., "Olivine" manufactured by Toyochem Co., Ltd., "Arontac" manufactured by Toagosei Co., Ltd., and "Cybinol" manufactured by Saiden Chemical Co., Ltd. ”, “SK Dine” manufactured by Soken Chemical Co., Ltd., “Acryset” manufactured by Nippon Shokubai Co., Ltd., “AS” manufactured by Lion Specialty Chemicals Co., Ltd., and “Vinylol” manufactured by Showa Denko K.K. .

The pressure-sensitive adhesive layer of the present invention is formed by pattern-coating a pressure-sensitive adhesive obtained by mixing the above acrylic copolymer with a predetermined tackifying resin and a cross-linking agent onto a release base material.

Examples of the coating apparatus for pattern coating include gravure coaters, screen coaters, rotary screen coaters, offset coaters, and the like, but are not limited to these, and the pattern is finally formed on the release substrate. Conventionally known devices and coating methods can be appropriately used as long as they can form a pressure-sensitive adhesive layer.

Examples of tackifying resins include terpene resins such as terpene phenolic resins, aromatic modified terpene resins, aromatic modified terpene resin hydrides, rosin resins such as rosin ester resins and polymerized rosin ester resins, hydrogenated petroleum resins, aliphatic petroleum resins such as petroleum resins, aromatic petroleum resins, and aliphatic/aromatic copolymer petroleum resins, xylene resins such as coumarone-indene resins, rosin-modified xylene resins, phenolic resins such as rosin-modified phenolic resins and resins such as acrylic resins are preferred. These resins have excellent compatibility with acrylic polymers. The tackifying resin may be used alone, or two or more selected from the same or different systems may be used in combination.
Among the above tackifying resins, rosin-based resins and terpene-based resins are more preferable, and terpene-based resins are even more preferable, from the viewpoint of ease of obtaining cohesive strength.

The softening point of the tackifying resin is 120-170°C, preferably 125-165°C, more preferably 125-160°C. Here, the softening point of the tackifying resin is a value determined by the ring and ball method described in JIS K 5601-2-2. When the softening point of the tackifying resin is less than 120°C, satisfactory cohesive force cannot be obtained and blocking tends to occur. sexuality declines.

When two or more tackifying resins are used in combination, tackifying resins having different softening points may be used together. For example, a combination of a tackifying resin with a softening point of 120-170°C and a tackifying resin with a softening point of less than 120°C, a tackifying resin with a softening point of 120-170°C and a tackifying resin with a softening point of over 170°C. and a combination of tackifying resins having a softening point of 120 to 170°C. That is, when a tackifying resin is used together, the softening point a (° C.) of the tackifying resin A and the softening point b (° C.) of the tackifying resin B should satisfy the following formula.
Softening point a × A / (A + B) + softening point b × B / (A + B) = 120 to 170
(A in the above formula indicates the weight of tackifying resin A, and B indicates the weight of tackifying resin B.)

The tackifying resin is preferably blended in an amount of 5 to 35 parts by weight (as solid content) with respect to 100 parts by weight (as solid content) of the acrylic copolymer, more preferably 15 to 30 parts by weight. When the amount of the tackifying resin is less than 5 parts by weight, a satisfactory cohesive force cannot be obtained and blocking tends to occur. Transferability, adhesiveness, and curved surface adhesiveness are reduced.

Examples of cross-linking agents include isocyanate-based, epoxy-based, metal chelate compound-based, amine compound-based, and melamine-based cross-linking agents. do. This synergistically improves the curved surface adhesiveness. Curved surface adhesiveness is adhesiveness when sticking to a curved surface or fixing an adherend that can be easily deformed in use, such as an envelope, and is formed by an acrylic copolymer and a cross-linking agent. The cohesive strength and stress relaxation properties of the adhesive layer based on the network polymer and the tackifier are balanced. Therefore, it is greatly affected by the structure of the network polymer after cross-linking.
On the other hand, when only the isocyanate-based cross-linking agent is mixed, the blocking resistance is poor, and when only the metal chelate-based cross-linking agent is mixed, the curved surface adhesiveness and transferability are poor. Satisfactory pressure-sensitive adhesive cannot be obtained.

Examples of isocyanate-based cross-linking agents include hexamethylene diisocyanate, phenylene diisocyanate, toluene diisocyanate, tolylene diisocyanate, xylylene diisocyanate, and naphthalene diisocyanate. The isocyanate-based cross-linking agents may be used alone or in combination of two or more.

Examples of metal chelate cross-linking agents include polyvalent metals such as aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium, and zirconium combined with alkoxides, acetylacetone, ethyl acetoacetate, and the like. listed compounds. Among these, an aluminum chelate compound or a titanium chelate compound is preferable. The metal chelate-based cross-linking agents may be used alone or in combination of two or more.
Specific examples of aluminum chelate compounds include aluminum isopropylate, aluminum secondary butyrate, aluminum tris(acetylacetate), aluminum tris(ethylacetoacetate), aluminum tris(acetylacetonate) and the like. Among them, aluminum tris (acetyl acetate) is preferable from the viewpoint of ease of control of the cross-linking reaction.
Specific examples of titanium chelate compounds include diisopropoxybis(ethylacetoacetate)titanium, diisopropoxybis(methylacetoacetate)titanium, diisopropoxybis(acetylacetonate)titanium, dibutoxybis(ethylacetoacetonate)titanium. , dimethoxybis(ethylacetoacetonate)titanium, and the like. Of these, isopropoxybis(ethylacetoacetate)titanium is preferred from the viewpoint of ease of control of the cross-linking reaction.

The total amount of the isocyanate-based cross-linking agent and the metal chelate-based cross-linking agent is preferably less than 0.5 parts by weight with respect to 100 parts by weight (in terms of solid content) of the acrylic copolymer. This is because an increase in the amount of the cross-linking agent lowers the tackiness (initial adhesion), resulting in problems such as lower transferability. In addition, the total amount of the cross-linking agent to be blended is preferably 0.2 parts by weight or more in order to ensure adhesion to paper and the like and adhesion to curved surfaces. The amount of the cross-linking agent to be blended can be appropriately changed according to the type of the component of the acrylic copolymer, the type of the adherend, and the like.

The metal chelate cross-linking agent is preferably used in an amount of 5 to 50 parts by weight with respect to 100 parts by weight of the isocyanate cross-linking agent (in terms of solid content), from the viewpoint of easiness of adjusting the balance between cohesion and stress relaxation. More preferably 10 to 45 parts by weight, still more preferably 15 to 35 parts by weight.

In addition to the above compounds, the pressure-sensitive adhesive layer may contain coloring materials, wetting agents, viscosity modifiers, lubricants, solvents, cross-linking retarders, leveling agents, plasticizers, Additives such as softeners, fillers, antistatic agents, anti-aging agents, UV absorbers, antioxidants and light stabilizers can be included. The content of these additives is not particularly limited as long as it does not impair the effects of the present invention.

The method of patterning the adhesive layer on the release substrate is not particularly limited. A gravure coater is used to pattern-coat the base material, followed by drying to form a pressure-sensitive adhesive layer. Examples of the solvent include ketones such as methyl ethyl ketone, acetone, methyl isobutyl ketone and cyclohexanone; esters such as ethyl acetate and butyl acetate; and hydrocarbons such as toluene, xylene and n-hexane. may be mixed and used. The amount of the adhesive applied (the amount after drying) is usually 10 to 50 g/m ² , more preferably 10 to 30 g/m, relative to the release base material (the area of the adhesive part and the non-adhesive part combined). ² .

The pressure-sensitive transfer adhesive tape of the present invention can be used for a pressure-sensitive transfer adhesive tape transfer tool by attaching it to a transfer tool having an automatic winding mechanism. The transfer tool includes a delivery reel around which the pressure-sensitive transfer adhesive tape is wound, and a transfer head that transfers the adhesive layer of the pressure-sensitive transfer adhesive tape supplied from the reel to the adherend while peeling it from the release base material. , and a winding reel for winding the pressure-sensitive transfer adhesive tape base material remaining after the transfer can be used by equipping the body with a winding reel that can be held with one hand.

EXAMPLES The present invention will be described in more detail with reference to Examples below, but the present invention is not limited to these Examples. In addition, in the following examples and the like, "%" and "parts" are by weight unless otherwise specified.

(Example 1)
<Preparation of acrylic pressure-sensitive adhesive composition (coating solution)>
Terpene phenol resin (Yasuhara Chemical Co., Ltd., YS Polyster U130, softening point 130 ° C. ) 10 parts of isocyanate-based cross-linking agent (solid content 75%, manufactured by Tosoh Corporation, Coronate L) 0.20 parts, aluminum chelate compound: aluminum tris (acetylacetonate) (manufactured by Kawaken Fine Chemicals Co., Ltd., aluminum chelate A(W)) 0.047 parts and 50 parts of toluene were mixed to obtain an acrylic pressure-sensitive adhesive composition coating liquid.

<Manufacture of pressure-sensitive transfer adhesive tape>
The acrylic pressure-sensitive adhesive composition coating solution was pattern-coated on the adhesive layer side release layer (heavy release surface) of the release substrate (material: polyethylene terephthalate film, thickness 12 μm) with a gravure coater, and then dried. Then, an adhesive layer having a circular dot-like pattern with an adhesive coating amount of 15 g/m ² was formed. Then, it was wound around a paper tube and cured (aged) at 40° C. for 7 days to obtain a pressure-sensitive transfer adhesive tape stock. The area of one circular dot was 2 mm ² , and the adhesive part area ratio was about 75%.

<Slit processing>
The original fabric obtained by the above method is cut into a width of 8.4 mm, for example, while being fed out at a speed at which the transfer (blocking) of the pressure-sensitive adhesive layer to the back side release layer does not occur, and a length of 16 m is cut into a diameter of 20 mm. It was wrapped around a paper tube to obtain a pancake.

(Example 2)
Instead of the adhesive made of acrylic copolymer used in Example 1, 95 parts of adhesive made of another acrylic copolymer (solid content 41.5%, manufactured by Lion Specialty Chemicals Co., Ltd.) was used. A pressure-sensitive transfer adhesive tape was obtained in the same manner as in Example 1, except that

(Example 3)
Example 1 except that 10 parts of a polymerized rosin ester resin (manufactured by Arakawa Chemical Industries, Ltd., Pencel D-160, softening point 159 ° C.) was used as the tackifying resin instead of the terpene phenol resin (YS Polyster U130). A pressure-sensitive transfer adhesive tape was obtained in the same manner as above.

(Example 4)
The procedure was the same as in Example 1, except that 10 parts of an aromatic hydrocarbon resin (manufactured by Tosoh Corporation, Petcol 130, softening point 125° C.) was used as the tackifying resin instead of the terpene phenol resin (YS Polyster U130). Thus, a pressure-sensitive transfer adhesive tape was obtained.

(Example 5)
As the tackifying resin, instead of terpene phenol resin (YS Polyster U130), 8 parts of aromatic hydrocarbon resin (manufactured by Tosoh Corporation, Petcol 140, softening point 136 ° C.), rosin ester resin (manufactured by Arakawa Chemical Industries, Ltd. , Superester A-100, softening point 99° C.) was used in the same manner as in Example 1 to obtain a pressure-sensitive transfer adhesive tape.

(Example 6)
Titanium chelate compound instead of aluminum chelate compound as metal chelate-based cross-linking agent: diisopropoxybis(ethylacetoacetate) titanium (63% solid content, manufactured by Matsumoto Fine Chemicals Co., Ltd., Orgatics TC-710) 0.045 parts A pressure-sensitive transfer adhesive tape was obtained in the same manner as in Example 1, except that .

(Comparative example 1)
In the same manner as in Example 1, except that the metal chelate cross-linking agent was not blended and the amount of the isocyanate cross-linking agent (Coronate L, manufactured by Tosoh Corporation) was changed from 0.20 parts to 0.25 parts. A pressure-sensitive transfer adhesive tape was obtained.

(Comparative example 2)
In the same manner as in Example 1, except that the isocyanate cross-linking agent was not blended, and the amount of the metal chelate cross-linking agent (Kawaken Fine Chemicals Co., Ltd., aluminum chelate A (W)) was added to 0.060 parts. , to obtain a pressure-sensitive transfer adhesive tape.

(Comparative Example 3)
Pressure-sensitive transfer adhesion was performed in the same manner as in Example 1, except that 10 parts of a terpene phenolic resin (manufactured by Yasuhara Chemical Co., Ltd., YS Polyster T100, softening point 99 ° C.) was used instead of the tackifier resin (YS Polyster U130). got the tape.

(Comparative Example 4)
In the same manner as in Example 1, except that 10 parts of a polymerized rosin ester resin (manufactured by Harima Kasei Co., Ltd., Hariester KT-3, softening point 179° C.) was used instead of the tackifying resin (YS Polystar U130). A pressure-sensitive transfer adhesive tape was obtained.

(Measurement of gel fraction)
A pressure-sensitive transfer adhesive tape stock was cut into a predetermined size, and the adhesive layer was peeled off from the release base material to be used as a sample. First, the weight of this sample is measured. Next, after immersing this sample in ethyl acetate at 40°C for 24 hours, the insoluble matter was filtered off with a 200-mesh wire mesh and the weight thereof was measured. was calculated as the gel fraction.

(Evaluation of pressure-sensitive transfer adhesive tape)
The resulting pressure-sensitive transfer adhesive tape was evaluated by the following methods.

(1) Evaluation of curved surface adhesiveness (repulsion resistance) A test piece prepared by the following method was attached to the side surface of a φ70 mm cylinder wrapped with kraft paper so that the longitudinal direction was the circumferential direction of the cylinder. A roller of 1 kg was reciprocated once from above. After 24 hours in an environment with a temperature of 23° C. and a humidity of 60% RH, the length (mm) of the part where the test piece was separated from the cylinder was measured. When both ends were peeled off, the total length was taken as the total length.
(Preparation of test piece)
A layout sheet (trade name: Layout Sheet Economy Co., Ltd.) cut into a width of 20 mm and a length of 150 mm is loaded with a commercially available transfer tool (manufactured by PN-MS Co., Ltd., Tombow Pencil) with the pancake obtained by the slit processing. A test piece was prepared by transferring the pressure-sensitive adhesive layer to the layout sheet in the longitudinal direction of the layout sheet.
◎: 0 (not peeled) to less than 10 mm peeled ○: 10 to less than 20 mm peeled △: 20 to less than 30 mm peeled ×: 30 mm or more peeled

(2) Evaluation of blocking resistance Unwinding the original pressure-sensitive transfer adhesive tape while changing the line speed to 10 m/min, 20 m/min, and 30 m/min, and whether or not the adhesive layer was blocked on the back side release layer. observed.
◎: No blocking of the adhesive layer at a speed of 30 m / min ○: No blocking of the adhesive layer at a speed of 20 m / min △: No blocking of the adhesive layer at a speed of 10 m / min ×: At a speed of 10 m / min With blocking of adhesive layer

(3) Evaluation of transferability The pancake obtained by the slit processing is loaded into a commercially available transfer tool (manufactured by PN-MS Co., Ltd. Tombow Pencil), and the transfer speed is 10 cm / sec in an environment of temperature 23 ° C. and humidity 60% RH. , 20 cm/sec, and 30 cm/sec, and the transferability of the pressure-sensitive adhesive layer was observed.
◎: transferred at a speed of 30 cm/sec without chipping or missing of the adhesive layer ○: transferred at a speed of 20 cm/sec without chipping or missing of the adhesive layer △: at a speed of 10 cm/sec The adhesive layer is transferred without chipping or missing. ×: Part of the adhesive layer is chipped or missing at a speed of 10 cm/sec.

Tables 1 and 2 show the evaluation results of Examples and Comparative Examples.

As is clear from Table 1, the acrylic copolymer is blended with a tackifying resin having a softening point of 120 to 170° C., and the pressure-sensitive adhesive is coated with an isocyanate compound and a metal chelate compound as a cross-linking agent. The pressure transfer pressure-sensitive adhesive tape was excellent in transferability, anti-blocking property and adhesion to curved surfaces. The adhesive cutability was also good. Almost no effect was observed due to the type of acrylic copolymer.

On the other hand, as is clear from Table 2, the pressure-sensitive transfer adhesive tapes of Comparative Examples 1 and 2, in which the cross-linking agent was blended alone, and the tackifying resin having a softening point outside the range of 120 to 170 ° C. were blended. All of the pressure-sensitive transfer adhesive tapes of Examples 3 and 4 were inferior in adhesion to curved surfaces.

The pressure-sensitive transfer adhesive tape of the present invention transfers an adhesive layer released from a base material to the surface of an adherend such as paper, film, foam, metal, etc., and adheres to another adherend. It is particularly preferable that the adherend is paper.

1 pressure-sensitive transfer adhesive tape 2 release substrate 3 adhesive layer (adhesive portion)
4 non-adhesive part

Claims (6)

A pressure-sensitive transfer adhesive tape comprising a release substrate provided with release layers on both sides of paper or a plastic film, and an adhesive layer patterned on the release substrate,
The pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is a pressure-sensitive adhesive obtained by mixing an acrylic copolymer, a tackifying resin having a softening point of 120 to 170 ° C., and an isocyanate compound and a metal chelate compound as a cross-linking agent. pressure-sensitive transfer adhesive tape. 2. The pressure-sensitive transfer adhesive tape according to claim 1, wherein the metal chelate compound is an aluminum chelate compound or a titanium chelate compound. 3. The pressure-sensitive transfer adhesive tape according to claim 1, wherein the adhesive has a gel fraction of 35 to 60%. 4. The pressure-sensitive transfer adhesive tape according to any one of claims 1 to 3, wherein the amount of the cross-linking agent mixed is less than 0.5 parts by weight per 100 parts by weight of the acrylic copolymer. Tackifying resins include terpene phenolic resins, aromatic modified terpene resins, aromatic modified terpene resin hydrides, rosin ester resins, polymerized rosin ester resins, hydrogenated petroleum resins, aliphatic petroleum resins, aromatic petroleum resins, fatty Any one of claims 1 to 4, comprising one or more resins selected from aromatic/aromatic copolymer petroleum resins, coumarone-indene resins, rosin-modified xylene resins, rosin-modified phenolic resins and acrylic resins. The pressure-sensitive transfer adhesive tape according to . The pressure-sensitive transfer adhesive tape according to any one of claims 1 to 5, wherein the area ratio of the adhesive part per unit area on the release base material is 15 to 98%.

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