JPWO2020153226A1 - Self-adhesive adhesive tape roll body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-adhesive adhesive tape roll body having all of high self-adhesive cohesion, low tack and low rewinding property. A self-adhesive adhesive tape obtained by winding an adhesive tape member having a tape-like substrate and an adhesive layer provided directly on one side of the tape-like substrate or via another layer in a roll shape. The pressure-sensitive adhesive layer is a roll body, and the pressure-sensitive adhesive layer contains a styrene-based elastomer and a pressure-sensitive adhesive resin. On the surface opposite to the surface on which the adhesive layer is provided, the surface roughness based on JIS B 0601-2013 is 0.5 to 5.0 μm in arithmetic average roughness (Ra), and ten points. A self-adhesive adhesive tape roll body characterized by having a fine uneven structure having an average roughness (Rz) of 10 to 50 μm. [Selection diagram] None

Description

The present invention relates to a self-adhesive adhesive tape roll body.

The self-adhesive adhesive tape is an adhesive tape having an adhesive layer and a base material layer like a normal adhesive tape, and binds various articles such as fresh vegetables, fresh flowers, documents, newspapers, and magazines. This is an adhesive tape specialized in particular (for example, Patent Document 1 and the like).

The method of using the self-adhesive adhesive tape is usually as follows. Cover the outer circumference of the bound object with the self-adhesive adhesive tape so that the self-adhesive surface (adhesive layer surface) of the self-adhesive tape faces the article (bonded object) to be bound, and then cover the self-adhesive surfaces of the adhesive tape with each other. By sticking together, the objects to be bound are bound.

The self-adhesive adhesive tape has high adhesive strength (self-adhesive force) between the adhesive surfaces and has high tackiness in order to reduce the influence of adhesive residue on the bound object and to achieve sufficient cohesiveness. It is required to have a low adhesive property.

Further, the self-adhesive adhesive tape is usually sold as a self-adhesive adhesive tape roll formed by winding a long self-adhesive adhesive tape. Further, a dedicated device for assisting the use of such a self-adhesive adhesive tape roll body has also been studied (for example, Patent Document 2 and the like).

Japanese Unexamined Patent Publication No. 2004-161962 Patent No. 6226880

Since the self-adhesive adhesive tape requires different self-adhesiveness (self-adhesive force and self-adhesive holding force) depending on the type of the target object to be bound, it is lower in order to cope with various uses. It is necessary to achieve both tackiness and higher self-cohesion.

Further, when the device disclosed in Patent Document 2 or the like is used, the adhesive surface of the self-adhesive adhesive tape set on the device is in contact with the device, so that the tack property is not hindered from the tape feeding. Is required to be lower. Further, in order to reduce the burden on the operator who operates this instrument for each binding, the rewinding property (unraveling property) of the self-adhesive tape in the self-adhesive tape roll body is lowered (lightened). I needed it.

Therefore, it is an object of the present invention to provide a self-adhesive adhesive tape roll body having all of high self-adhesive binding property, low tackiness, and low rewinding property.

The present inventors have conducted diligent research under the above-mentioned problems, found that the above-mentioned problems can be solved by combining a specific tape-shaped base material and a specific adhesive tape member, and completed the present invention. rice field. That is, the present invention is as follows.

(1) The present invention
A self-adhesive adhesive tape roll body obtained by winding an adhesive tape member having a tape-like substrate and an adhesive layer provided directly on one side of the tape-like substrate or via another layer in a roll shape. hand,
The pressure-sensitive adhesive layer contains a styrene-based elastomer and a pressure-sensitive adhesive resin.
The tackifier resin contains an alicyclic saturated hydrocarbon resin,
The tape-like substrate has a surface roughness based on JIS B 0601-2013 on the surface opposite to the surface provided with the adhesive layer, which is 0.5 to 5.0 μm in arithmetic average roughness (Ra). In addition, it is a self-adhesive adhesive tape roll body characterized by having a fine uneven structure having a ten-point average roughness (Rz) of 10 to 50 μm.
(2) The fine uneven structure has a surface roughness based on JIS B 0601-2013 of 1.0 to 4.0 μm in arithmetic average roughness (Ra) and 20 in ten-point average roughness (Rz). It may be ~ 40 μm.
(3) The pressure-sensitive adhesive layer may contain a high styrene-containing elastomer having a styrene content of more than 20% by mass and a low styrene-containing elastomer having a styrene content of 20% by mass or less.
(4) The mass (El) of the low styrene-containing elastomer having a styrene content of 20% by mass or less and the mass (Eh) of the high styrene-containing elastomer having a styrene content of more than 20% by mass in the pressure-sensitive adhesive layer. The ratio (El / Eh) of may be 2.0 or less.
(5) The ratio of the alicyclic saturated hydrocarbon resin to the entire tackifier resin in the pressure-sensitive adhesive layer may be 50 to 95% by mass.
(6) The adhesive tape member may be a laminate in which the tape-shaped base material, the ink layer, the primer layer, and the adhesive layer are laminated in this order.
(7) The self-adhesive adhesive tape roll body may be a plant-invited citation.

According to the present invention, it is possible to provide a self-adhesive adhesive tape roll body having all of high self-adhesive binding property, low tack property, and low rewinding property.

FIG. 1 shows a conceptual side view of the self-adhesive adhesive tape roll body 100 according to the present embodiment. FIG. 2 shows a conceptual side view of the adhesive tape member 110 according to the present embodiment. FIG. 3 shows a conceptual diagram of a test method for self-adhesive holding force according to this embodiment.

Next, the present invention will be specifically described with reference to FIGS. 1 and 2, but the present invention is not limited to the following.

<<<<< Self-adhesive adhesive tape roll body 100 >>>>>
The self-adhesive adhesive tape roll body 100 is formed by winding an adhesive tape member 110 in a roll shape with a shaft core 120 as a core (FIG. 1).

In the self-adhesive adhesive tape roll body 100, the roll diameter, the number of turns of the adhesive tape member 110, and the like can be appropriately changed.

The material and shape of the shaft core 120 are not particularly limited, and can be appropriately changed depending on the use of the self-adhesive adhesive tape roll body 100 and the like. Further, the self-adhesive adhesive tape roll body 100 may be a roll body (so-called coreless type) having no shaft core 120.

Hereinafter, the adhesive tape member 110 will be described in detail.

<<< Adhesive Tape Member 110 >>>
The adhesive tape member 110 is a laminated body having a tape-shaped base material 111 and a pressure-sensitive adhesive layer 114 provided on one side of the tape-shaped base material 111.

Further, as shown in FIG. 2, another layer may be interposed between the tape-shaped base material 111 and the pressure-sensitive adhesive layer 114. As the other layer, the ink layer 112 and the primer layer 113 are preferable. More specifically, as shown in FIG. 2, the adhesive tape member 110 is a laminate in which a tape-shaped base material 111, an ink layer 112, a primer layer 113, and an adhesive layer 114 are laminated in this order. Is preferable.

<< Tape-like base material 111 >>
A fine concavo-convex structure is provided on the surface of the tape-shaped substrate 111 opposite to the surface on which the pressure-sensitive adhesive layer 114 is provided (the tape-shaped substrate surface 111a in FIG. 2). In the self-adhesive adhesive tape roll body 100, the tape-shaped base material surface 111a and the surface of the adhesive layer 114 (adhesive layer surface 114a) are wound so as to be in contact with each other. As a result, the fine uneven structure provided on the tape-shaped base material surface 111a is transferred to the pressure-sensitive adhesive layer surface 114a. That is, the adhesive tape member 110 drawn out from the self-adhesive adhesive tape roll body 100 also has a similar fine uneven structure. By transferring a predetermined fine concavo-convex structure to the surface of the pressure-sensitive adhesive layer 114a, the contact area of the pressure-sensitive adhesive layer 114 having a predetermined component with the adherend is reduced, low tackiness is realized, and the pressure-sensitive adhesive layer is realized. When the 114s are crimped to each other, the uneven structure is crushed, so that the strong adhesive force (self-adhesiveness) derived from the adhesive forming the adhesive layer 114 is exhibited.

More specifically, on the tape-shaped substrate surface 111a, the surface roughness based on JIS B 0601-2013 is 0.5 to 5.0 μm (or more than 0.5 5.0 μm) in arithmetic mean roughness (Ra). Less than) fine uneven structure is provided. By setting the roughness of the fine concavo-convex structure within this range, the effect of the present invention can be realized. In order to further enhance the effect of the present invention, the surface roughness based on JIS B 0601-2013 is 1.0 to 4.0 μm (or more than 1.0 and less than 4.0 μm) in arithmetic mean roughness (Ra). It is preferable to have. Furthermore, the surface roughness based on JIS B 0601-2013 is preferably 10 to 50 μm in ten-point average roughness (Rz), and more preferably 20 to 40 μm in ten-point average roughness (Rz). preferable. More specifically, this surface roughness can be measured by the following method.
One side is measured under the following conditions using a Surfcoder ET4000A manufactured by Kosaka Laboratory.
Measuring force: 30 μN
X pitch: 4.00 μm
Y pitch: 4 μm
Z measurement magnification: 10000
X feed speed: 0.5 mm / sec
Low frequency cut: 0.8mm
High frequency cut: R + W
Leveling: least squares method

The fine uneven structure can be formed by a known processing method, for example, satin finish processing, sandblasting, hairline processing, etc., but the fine uneven structure can be formed by satin finish in that a fine uneven structure can be formed. It is preferable to do so.

The material of the tape-shaped base material 111 is not particularly limited, and examples thereof include a plastic film made of a polyolefin resin, a polyester resin, a vinyl chloride resin, a polyimide resin, and the like, crepe paper, Japanese paper, and a non-woven fabric. .. These may be used alone or in combination of two or more. Further, the tape-shaped base material 111 may be a laminated body composed of a plurality of layers. Further, when the tape-shaped base material 111 is a laminated body composed of a plurality of layers, a layer composed of an adhesive or an adhesive may be interposed.

The material of the tape-shaped base material 111 is preferably a plastic film.

The thickness of the tape-shaped base material 111 is not particularly limited, but may be, for example, 50 to 100 μm, preferably 60 to 80 μm.

Further, the tape-shaped base material 111 may have a back surface treatment agent applied to the back surface (tape-shaped base material surface 111a) side of the tape-shaped base material 111. As such a back treatment agent, known and customary ones can be used, and examples thereof include long-chain alkyl-based back treatment agents.

<< Ink layer 112 >>
The ink layer 112 is usually a layer formed by directly coloring (including printing) the surface of the tape-shaped base material 111 (the surface of the tape-shaped base material 111 on the pressure-sensitive adhesive layer 114 side). It may be formed of a film or the like colored with a predetermined colorant.

<< Primer layer 113 >>
The primer layer 113 can be, for example, the one described in International Publication No. 2014/126158.

<< Adhesive layer 114 >>
The pressure-sensitive adhesive layer 114 is formed of a pressure-sensitive adhesive composition containing a styrene-based elastomer and a pressure-sensitive adhesive resin. Further, the pressure-sensitive adhesive layer 114 may contain other components, if necessary.

<Styrene-based elastomer>
The styrene-based elastomer is not particularly limited, and is, for example, a styrene-isoprene-styrene block copolymer (SIS), a styrene-butadiene-styrene block copolymer (SBS), or a styrene-ethylenebutylene-styrene block copolymer (Styrene-ethylenebutylene-styrene block copolymer). SEBS), styrene-ethylenepropylene-styrene block copolymer (SEPS), styrene-ethyleneethylenepropylene-styrene block copolymer (SEEPS), styrene-butadiene-butene-styrene block copolymer (SBBS) and the like. .. In addition, these may be partially modified. These may be used alone or in combination of two or more.

The styrene-based elastomer includes a form containing only a high styrene-containing elastomer having a styrene content of more than 20% by mass, a form containing only a low styrene-containing elastomer having a styrene content of 20% by mass or less, a high styrene-containing elastomer and a low styrene-based elastomer. It may be in any form containing a styrene-containing elastomer, but a form containing a high styrene-containing elastomer and a low styrene-containing elastomer is preferable.

The styrene content of the high styrene-containing elastomer is preferably more than 20% by mass and 40% by mass or less, and more preferably 25% by mass to 35% by mass.

The styrene content of the low styrene-containing elastomer is preferably 14% by mass to 20% by mass, more preferably 16% by mass to 18% by mass.

The ratio (El / Eh) of the content (El) of the low styrene-containing elastomer to the content (Eh) of the high styrene-containing elastomer in the pressure-sensitive adhesive layer is preferably 2.0 or less, preferably 1.5. It is more preferably 0 or less, and particularly preferably 1.0 or less.

The content of the styrene-based elastomer in the pressure-sensitive adhesive layer 114 is preferably 55.5 to 62.5% by mass, more preferably 60.0 to 62.5% by mass.

<Adhesive-imparting resin>
The tackifier resin is not particularly limited, and for example, a rosin-based resin, a terpene-based resin, an aliphatic petroleum resin, an alicyclic saturated hydrocarbon resin, an aromatic petroleum resin, a Kumaron inden resin, a styrene-based resin, etc. Examples thereof include phenolic resins and xylene resins. These may be used alone or in combination of two or more. In order to enhance the effect of the present invention, it is preferable to use an alicyclic saturated hydrocarbon resin as the tackifier resin.

The tackifier resin preferably contains any one or more of an alicyclic saturated hydrocarbon resin and a terpene resin or a styrene resin, and preferably contains all of them.

The alicyclic saturated hydrocarbon resin preferably has a softening point of 90 to 140 ° C, more preferably 120 to 140 ° C.

The terpene-based resin preferably has a softening point of 80 to 130 ° C, more preferably 110 to 120 ° C.

The styrene-based resin preferably has a softening point of 100 to 140 ° C, more preferably 110 to 130 ° C.

The content of the alicyclic saturated hydrocarbon resin with respect to the entire tackifier resin is preferably 50% by mass or more, preferably 50 to 95% by mass (specifically, 50 to 93.9% by mass). Is more preferable, and 60 to 80% by mass is particularly preferable.

The content of the terpene-based resin with respect to the entire tackifier resin is preferably 15 to 50% by mass, more preferably 25 to 40% by mass.

The content of the styrene-based resin with respect to the entire tackifier resin is preferably 1.0 to 12.0% by mass, more preferably 5.0 to 8.0% by mass.

The content of the tackifier resin in the pressure-sensitive adhesive layer 114 is preferably 37.5 to 44.5% by mass, more preferably 37.5 to 40.0% by mass.

<Other ingredients>
Other components include known additives such as fillers, antioxidants, colorants, softeners, plasticizers, UV absorbers, anti-aging agents and the like. Further, as other components, a pressure-sensitive adhesive component other than the styrene-based elastomer (for example, a rubber-based pressure-sensitive adhesive other than the styrene-based elastomer, an acrylic pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, etc.) may be contained.

(filler)
Examples of the filler include calcium carbonate, zinc oxide (zinc oxide), aluminum silicate, silica, talc, slaked soil, slaked sand, light stone powder, slate powder, mica powder, aluminum sol, alumina white, aluminum sulfate, and the like. Barium Sulfate, Litopon, Calcium Sulfate, Molybdenum Disulfide, Graphite, Glass Fiber, Glass Sphere, Potash Monocrystalline Titanium Acid, Carbon Fiber, Active Zinc Oxide, Zinc Oxide, Magnesium Oxide, Basic Magnesium Carbonate, Lisage, Lead Tan, Lead Examples include white, calcium hydroxide, activated calcium hydroxide, titanium oxide and the like. These may be used alone or in combination of two or more.

In the self-adhesive adhesive tape, low tackiness and high self-adhesiveness are usually achieved by adding a high amount of filler. However, in the present invention, low tackiness and high self-adhesiveness can be achieved even when the amount of the filler is low.

Specifically, in the pressure-sensitive adhesive layer 114, the blending amount of the filler is 20% by mass or less, 10% by mass or less, 5% by mass or less, 1% by mass or less, 0.1% by mass or less, 0% by mass or the like. can do. Further, it is possible to improve the performance of the self-adhesive adhesive tape by blending the filler. In that case, the blending amount of the filler in the pressure-sensitive adhesive layer 114 is 0.1% by mass or more and 1 It may be mass% or more, 5 mass% or more, and the like.

(Antioxidant)
Examples of the antioxidant include dibutylhydroxytoluene (BHT), butylhydroxyanisole (BHA), vitamin C (ascorbic acid), vitamin E (tocopherol), sodium erythorbate, propyl gallate, sodium sulfite, and sulfur dioxide. Can be mentioned. These may be used alone or in combination of two or more.

(Colorant)
The colorant may be either an inorganic type or an organic type, and these may be added so as to obtain the desired color development. These may be used alone or in combination of two or more.

(Softener)
Examples of the softener include petroleum-based softeners, plant-based softeners, liquid rubbers, liquid tackifier resins, synthetic plasticizers, and the like. These may be used alone or in combination of two or more.

(UV absorber)
Examples of the ultraviolet absorber include salicylic acid derivatives, benzophenone compounds, benzotriazole compounds, cyanoacrylate compounds and the like. These may be used alone or in combination of two or more.

(Anti-aging agent)
Anti-aging agents include naphthylamine compounds, diphenylamine compounds, p-phenylenediamine compounds, other amine compounds, amine compound mixtures, quinoline compounds, hydroquinone derivatives, monophenol compounds, bisphenol compounds, and trisphenol compounds. Examples thereof include compounds, polyphenol-based compounds, and thiobisphenol-based compounds. These may be used alone or in combination of two or more.

The thickness of the pressure-sensitive adhesive layer 114 is not particularly limited, but may be, for example, 10 to 40 μm, preferably 20 to 30 μm.

<<< Manufacturing method of self-adhesive adhesive tape roll >>>
The method for producing the self-adhesive adhesive tape roll body 100 is not particularly limited, and the self-adhesive adhesive tape roll body 100 can be produced by a known method. An example of a method for manufacturing the self-adhesive adhesive tape roll body 100 will be described below.

First, a pressure-sensitive adhesive liquid prepared by adding an organic solvent or the like to the raw material constituting the pressure-sensitive adhesive layer 114, and a tape-shaped base material 111 having a fine concavo-convex structure on at least one side are prepared.

Next, the printing treatment and the primer treatment are sequentially performed on the surface of the tape-shaped base material 111 opposite to the surface on which the fine concavo-convex structure is provided to form the ink layer 112 and the primer layer 113.

Next, the adhesive liquid is applied onto the primer layer 113 using an applicator or the like. Then, for example, it is dried at 100 ° C. for 3 minutes to obtain an adhesive tape member 110 having an adhesive layer 114 on the primer layer 113.

Finally, the adhesive tape member 110 can be wound along the outer circumference of the shaft core 120 to manufacture the self-adhesive adhesive tape roll body 100.

<<< Applications of the self-adhesive adhesive tape roll body 100 >>>
Since the self-adhesive adhesive tape roll body 100 has low tackiness, high self-adhesive binding property, and low rewinding property, it can be used for various purposes. For example, it can be used as an adhesive tape for binding various articles such as fresh vegetables, fresh flowers, documents, newspapers, and magazines. In addition, the adhesive is impregnated with a cloth as a base material, or sprayed on both sides to dry, wind, and cut into a tape roll, and an adhesive bandage, sports fixing tape, sports non-slip tape, etc. Can also be used as.

Since the self-adhesive adhesive tape roll body 100 has low tackiness and does not inhibit the growth of vegetables, it can be preferably used as a citation for vegetables. Further, since the self-adhesive adhesive tape roll body 100 has a high self-adhesive binding property, it can be preferably used for bundling where a high load is required. For example, among the citations for vegetables, it is preferable to cite tomatoes and the like. When attracting cucumbers, grapes, etc., it is sufficient to assume a maximum load capacity of about 500 g for the self-adhesive adhesive tape, and conventional self-adhesive adhesive tape can also be used. However, in attracting tomatoes and the like, it may be necessary to assume a high load of up to about 1000 g as the load capacity of the self-adhesive adhesive tape. Since the self-adhesive adhesive tape roll body 100 according to the present invention has low tackiness and high self-adhesive binding property, it can sufficiently cope with the attraction of vegetables having such a high load.

Further, since the self-adhesive adhesive tape roll body 100 has low tackiness and low rewinding property, the self-adhesive adhesive tape roll set in a device dedicated to the self-adhesive adhesive tape disclosed in Japanese Patent No. 6226880 and the like. It can be preferably used as a body.

[Examples 1 to 14: Tables 1 to 3]
As the elastomer ratio, 20 parts by weight of "low styrene SIS (styrene content: 16% by mass, Quintac 3433N manufactured by Nippon Zeon)" and "high styrene SIS (styrene content: 25% by mass, Asaplen ATN521 manufactured by Asahi Kasei Co., Ltd.)" 80 Adhesive-imparting resin "Terpen resin (Yasuhara Chemical Co., Ltd .: YS resin PX1150N)", "Alicyclic saturated hydrocarbon resin (Arakawa Chemical Co., Ltd .: Alcon P140)", "Styrene resin (manufactured by Yasuhara Chemical Co., Ltd .: Alcon P140)" Several types of rubber-based pressure-sensitive adhesives were prepared in which the number of copies of each of "Mitsui Kagaku Co., Ltd .: FTR2120)" and "Styrene resin (Mitsui Kagaku Co., Ltd .: FTR2140)" was changed.

A 70 μm-thick CPP film having a fine uneven structure (arithmetic mean roughness (Ra) 2.9 μm, ten-point average roughness (Rz) 29.7 μm, satin finished surface) on one side was prepared. An ink layer (colored layer) and a primer layer were sequentially formed on the opposite side surface of the CPP film having a fine concavo-convex structure. An adhesive tape having a width of 11 mm was prepared by applying the adhesive layer on the primer layer so that the thickness of the adhesive layer was 30 μm. The adhesive layer was wound so that the satin-finished surface of the film touched, and an adhesive tape roll having a width of 11 mm was prepared.

[Examples 15 to 18, Comparative Examples 1 to 2: Table 4]
With the following adhesive tape roll body, the effect of the fine uneven structure on the adhesive characteristics was confirmed. A 70 μm-thick CPP film having a satin-finished surface under various conditions on one side was prepared. An ink layer (colored layer) and a primer layer were sequentially formed on the pressure-sensitive adhesive-coated surface in the same manner as in Examples 1 to 14. The adhesive of Example 6 was applied onto the primer layer so that the thickness of the adhesive layer was 30 μm to prepare an adhesive tape having a width of 11 mm. The adhesive layer was wound so that the satin-finished surface of the film touched, and an adhesive tape roll having a width of 11 mm was prepared.

[Probe tack test]
Under the conditions of 23 ° C. and 50% RH, the tapes (width 11 mm) of Examples and Comparative Examples were used as test pieces, and a probe tack test was performed according to ASTM D2979. Specifically, the test piece is attached to the weight ring so that there is no slack, and a cylindrical probe having a diameter of 5 mm ^{is applied to the adhesive surface of the test piece with a load of 0.98 ± 0.001 N / cm 2} and a contact speed of 10 ± 0. After contacting at 1 mm / sec for 1.0 ± 0.01 seconds, the force (N / 5 mmφ) required to peel the probe vertically from the adhesive surface was measured at the same speed as the contact speed.

[Test of self-adhesive holding power (23 ° C, 50% RH)]
The self-adhesive holding force test was performed according to the following method. With the collected test pieces (adhesive tape with a width of 11 mm) on the inside, the adhesive surfaces are bonded together so that the test pieces do not stretch or air bubbles enter. The bonding length shall be 100 mm or more. Next, from the top of the test piece, one reciprocating crimp is performed at a crimping speed of about 300 mm per minute using a 2 kg crimping roller, and the mixture is left for 20 to 40 minutes. Then, as shown in FIG. 3, one end of the test piece is fixed and a weight is hung on the other end. Before hanging the weight, peel off the bonded part by about 5 mm and mark the boundary part with magic or the like. After the specified time, with the weight applied, read the deviation distance (between marks such as magic) with a caliper.

[Low-speed rewinding force test (23 ° C, 50% RH)]
A low-speed rewinding force test was performed according to JIS Z 0237-2009 under the conditions of 23 ° C. and 50% RH. The optimum low-speed rewinding force is 0.05 to 0.70 N / 11 mm. If the low-speed rewinding force exceeds the upper limit, a load will be applied to the tape drawer, making it difficult to work. More specifically, when a binding machine dedicated to the self-adhesive adhesive tape disclosed in Japanese Patent No. 6226880 or the like is used, a problem is likely to occur. On the other hand, if the low-speed rewinding force falls below the lower limit, the tape may be inadvertently pulled out and the tape body may be unwound when the tape is pulled out.

[Printability: Appearance of printed surface]
Visually judge according to the following criteria.
◯: Has a graceful appearance without unevenness △: Not noticeable unevenness, but slightly lacking in uniform appearance ×: Lacking in unevenness and uniform appearance

(result)
The results of each of the above tests are shown in Tables 1 to 4.

(Discussion)
Based on Tables 1 to 3, the tackifying resin to be blended is "terpene resin (Yasuhara Chemical Co., Ltd .: YS resin PX1150N)", "alicyclic saturated hydrocarbon resin (Arakawa Chemical Industry Co., Ltd .: Alcon P140)", "styrene resin". (Mitsui Chemicals Co., Ltd .: FTR2120) ”and“ Styrene resin (Mitsui Chemicals Co., Ltd .: FTR2140) ”were confirmed to have the optimum number of copies. Among them, Example 6 in Table 2 had the characteristics closest to the target value. Further, regarding the styrene resin, the system containing FTR2140 having a high softening point tended to be slightly inferior to the system containing FTR2120.

According to Table 4, it can be confirmed that the effect of the invention is not exhibited when the adhesive tape having a fine concavo-convex structure whose roughness is not within a predetermined range is used. In addition, Example 16 had the characteristics closest to the target.

When the low-speed rewinding force was measured for Examples 1 to 14, it was confirmed that the low-speed rewinding force was within the optimum range as in Examples 15 to 18.

Furthermore, the relationship between the content of high styrene SIS (Eh) and the content of low styrene SIS (El) in the pressure-sensitive adhesive layer was confirmed. Specifically, the study was conducted with El: Eh = 100: 0, 80:20, 60:40, 40:60, 20:80, 0: 100. As a result, El: Eh = 60: 40 (El / Eh = 1.5), 40:60 (El / Eh = 0.67), 20:80 (El / Eh = 0.25), 0: 100 ( It was confirmed that when El / Eh = 0), the probe tack and the self-adhesive holding power tended to be particularly excellent.

100 Self-adhesive adhesive tape roll 110 Adhesive tape member 111 Tape-like base material 111a Tape-like base material surface 112 Ink layer (colored layer)
113 Primer layer 114 Adhesive layer 114a Adhesive layer surface 120 Jikushin

Claims (7)

A self-adhesive adhesive tape roll body obtained by winding an adhesive tape member having a tape-like substrate and an adhesive layer provided directly on one side of the tape-like substrate or via another layer in a roll shape. hand,
The pressure-sensitive adhesive layer contains a styrene-based elastomer and a pressure-sensitive adhesive resin.
The tackifier resin contains an alicyclic saturated hydrocarbon resin and contains.
The tape-like substrate has a surface roughness based on JIS B 0601-2013 on the surface opposite to the surface provided with the adhesive layer, which is 0.5 to 5.0 μm in arithmetic average roughness (Ra). A self-adhesive adhesive tape roll body, which is characterized by having a fine uneven structure having a ten-point average roughness (Rz) of 10 to 50 μm. The fine uneven structure has a surface roughness based on JIS B 0601-2013 of 1.0 to 4.0 μm in arithmetic average roughness (Ra) and 20 to 40 μm in ten-point average roughness (Rz). The self-adhesive adhesive tape roll body according to claim 1. The adhesive layer according to claim 1 or 2, wherein the pressure-sensitive adhesive layer contains a high styrene-containing elastomer having a styrene content of more than 20% by mass and a low styrene-containing elastomer having a styrene content of 20% by mass or less. Self-adhesive adhesive tape roll body. The ratio of the mass (El) of the low styrene-containing elastomer having a styrene content of 20% by mass or less to the mass (Eh) of the high styrene-containing elastomer having a styrene content of more than 20% by mass in the pressure-sensitive adhesive layer (Eh). The self-adhesive adhesive tape roll body according to any one of claims 1 to 3, wherein El / Eh) is 2.0 or less. The self-adhesive adhesive tape according to any one of claims 1 to 4, wherein the alicyclic saturated hydrocarbon resin accounts for 50 to 95% by mass with respect to the entire pressure-imparting resin in the pressure-sensitive adhesive layer. Roll body. The invention according to any one of claims 1 to 5, wherein the adhesive tape member is a laminate in which the tape-shaped base material, the ink layer, the primer layer, and the adhesive layer are laminated in this order. Self-adhesive adhesive tape roll body. The self-adhesive adhesive tape roll body according to any one of claims 1 to 6, which is a plant-invited citation.

Images