JP7748243B2 - Self-adhesive adhesive tape roll - Google Patents

Description

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

Self-adhesive tape is an adhesive tape that has an adhesive layer and a base layer, similar to regular adhesive tape, and is an adhesive tape specialized for binding various items such as fresh vegetables, fresh flowers, documents, newspapers, and magazines (see, for example, Patent Document 1, etc.).

Self-adhesive tape is typically used as follows: The outer periphery of the item to be bound (item to be bound) is covered with the self-adhesive tape so that the self-adhesive surface (adhesive layer surface) of the self-adhesive tape faces the item to be bound, and then the self-adhesive surfaces of the tape are glued together to bind the item.

Self-adhesive tape is required to have adhesive properties that minimize the impact of adhesive residue on the objects being bound and achieve sufficient binding strength, including high adhesion between the adhesive surfaces (self-adhesion) and low tackiness.

Self-adhesive adhesive tape is typically sold as a self-adhesive adhesive tape roll formed by winding a long length of self-adhesive adhesive tape. Furthermore, specialized devices to assist in the use of such self-adhesive adhesive tape rolls are also under consideration (e.g., Patent Document 2, etc.).

Japanese Patent Application Laid-Open No. 2004-161962 Patent No. 6226880

The self-adhesive binding properties (self-adhesive strength and self-adhesive retention) required for self-adhesive tapes vary depending on the type of object being bound, so in order to accommodate a variety of applications, it is necessary to achieve both lower tackiness and higher self-adhesive binding properties.

Furthermore, when using the device disclosed in Patent Document 2 and other documents, it is necessary to further reduce the resistance (insertion resistance) when inserting the device into the object to be bound.

The present invention aims to provide a self-adhesive adhesive tape roll that combines high self-adhesive binding properties, low tack, and low insertion resistance.

As a result of extensive research, the inventors have discovered that the above-mentioned problems can be solved by specifying the particles contained in the self-adhesive adhesive tape. Specifically, the present invention is as follows:

The present invention provides
A self-adhesive adhesive tape roll body obtained by winding an adhesive tape member having a tape-shaped substrate and an adhesive layer provided on one side of the tape-shaped substrate directly or via another layer,
the pressure-sensitive adhesive layer contains a filler,
The self-adhesive pressure-sensitive adhesive tape roll is characterized in that the filler having a particle size of 45 μm or more is 0.5 mass % or more based on the total amount of the filler.
The average particle size of the filler is preferably 0.1 to 100 μm.
The filler preferably includes silica particles and calcium carbonate particles.
The coating amount of the pressure-sensitive adhesive layer is preferably 25 to 35 g/m ² .

The present invention makes it possible to provide a self-adhesive adhesive tape roll that combines high self-adhesive binding strength, low tack, and low insertion resistance.

FIG. 1 shows a conceptual side view of a self-adhesive adhesive tape roll 100 according to this embodiment. FIG. 2 shows a conceptual side view of the adhesive tape member 110 according to this embodiment. FIG. 3 shows a conceptual diagram of the self-adhesion holding strength testing method according to this embodiment.

The present invention is a self-adhesive adhesive tape roll made by winding a tape substrate into a roll, and is particularly suitable for use as a tape roll for attracting plants.

The following describes the configuration, manufacturing method, and uses of the self-adhesive adhesive tape roll 100 according to the present invention. Below, when upper and lower limits are stated separately, it is understood that any numerical range that can be freely combined with these limits is essentially stated.

<<<<<Self-adhesive adhesive tape roll 100>>>>
The self-adhesive adhesive tape roll 100 is formed by winding an adhesive tape member 110 into a roll around a shaft core 120 (FIG. 1).

The roll diameter and number of turns of the adhesive tape member 110 in the self-adhesive adhesive tape roll 100 can be changed as needed.

The material and shape of the core 120 are not particularly limited and can be changed as appropriate depending on the application of the self-adhesive adhesive tape roll 100. Furthermore, the self-adhesive adhesive tape roll 100 may be a roll that does not have a core 120 (a so-called coreless type).

The adhesive tape member 110 is described in detail below.

<<<Adhesive Tape Member 110>>>
The adhesive tape member 110 is a laminate having a tape substrate 111 and an adhesive layer 114 provided on one surface of the tape substrate 111 .

Furthermore, as shown in FIG. 2, another layer may be interposed between the tape substrate 111 and the adhesive layer 114. This other layer is preferably an ink layer 112 and a primer layer 113. More specifically, as shown in FIG. 2, the adhesive tape member 110 is preferably a laminate in which the tape substrate 111, the ink layer 112, the primer layer 113, and the adhesive layer 114 are laminated in this order.

<<Tape substrate 111>>
A conventionally known substrate used as a substrate for an adhesive tape member can be used as the tape substrate 111. The tape substrate 111 can be, for example, a film, a woven fabric, a nonwoven fabric, or the like.

Here, a fine uneven structure may be provided on the surface of the tape substrate 111 opposite to the surface on which the adhesive layer 114 is provided (tape substrate surface 111a in Figure 2).

The self-adhesive adhesive tape roll 100 is wound so that the tape substrate surface 111a and the surface of the adhesive layer 114 (adhesive layer surface 114a) are in contact. As a result, the micro-relief structure provided on the tape substrate surface 111a is transferred to the adhesive layer surface 114a. In other words, the adhesive tape member 110 unwound from the self-adhesive adhesive tape roll 100 also has a similar micro-relief structure. By transferring the specified micro-relief structure to the adhesive layer surface 114a, the contact area of the adhesive layer 114 containing the specified components with the adherend is reduced, achieving low tackiness. In addition, when the adhesive layers 114 are pressed together, the relieving structure is crushed, allowing the strong adhesive strength (self-adhesion) inherent in the adhesive that forms the adhesive layer 114 to be exerted.

More specifically, the tape substrate surface 111a is provided with a fine uneven structure having a surface roughness based on JIS B 0601-2013 of 0.5 to 5.0 μm (or more than 0.5 and less than 5.0 μm) in arithmetic mean roughness (Ra). By setting the roughness of the fine uneven structure within this range, the effects of the present invention can be achieved. To further enhance the effects of the present invention, the surface roughness based on JIS B 0601-2013 is preferably 1.0 to 4.0 μm (or more than 1.0 μm and less than 4.0 μm) in arithmetic mean roughness (Ra). Furthermore, the surface roughness based on JIS B 0601-2013 is preferably 10 to 50 μm in ten-point mean roughness (Rz), and more preferably 20 to 40 μm in ten-point mean roughness (Rz). 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: 30μN
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

The fine uneven structure can be formed by known processing methods, such as matte finish, sandblasting, and hairline finish, but it is preferable to form the fine uneven structure by matte finish, as this allows for the formation of a densely textured structure.

The material for the tape substrate 111 is not particularly limited, but examples include resin films formed from polyolefin resins, polyester resins, vinyl chloride resins, polyimide resins, etc., crepe paper, Japanese paper, nonwoven fabric, etc. These may be used alone or in combination of two or more types. The tape substrate 111 may also be a laminate consisting of multiple layers (for example, a composite substrate in which paper is laminated onto a resin film). Furthermore, when the tape substrate 111 is a laminate consisting of multiple layers, a layer consisting of a pressure-sensitive adhesive or adhesive may be interposed between them.

The material for the tape substrate 111 is preferably a resin film.

The tape substrate 111 may contain a pro-oxidant.

The pro-oxidant may be at least one selected from unsaturated fatty acids, aliphatic monocarboxylic acids, and salts thereof.

In this way, because the tape substrate 111 contains an antioxidant, oxidation (deterioration) of the tape substrate 111 occurs when harvesting plants attracted with the adhesive tape member 110, making it possible to easily cut the plants by hand without using tools such as scissors.

The amount of the pro-oxidant is preferably 0.03% by mass or more, based on the total mass of the tape substrate. There are no particular upper limits, but examples include 1%, 2%, 3%, 4%, and 5% by mass.

The amount of pro-oxidant added here preferably corresponds to the plant's growth period. Specifically, it is preferable to add an amount of pro-oxidant that imparts to the tape base the following properties: (1) maintains sufficient strength to maintain the plant/pole fixation state after the plant is fixed to the support or the like with the tape until the plant is harvested, while (2) reduces in strength to the point where the tape base can be torn by hand at the time of harvest. For example, in the case of tomatoes, the growth period in outdoor cultivation is approximately 3 to 6 months. Therefore, it is preferable to add an amount of pro-oxidant that will allow the tomato stem to be fixed to the support for approximately 3 months, and reduce in strength to the point where the tape base can be torn after approximately 6 months.

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

The tape substrate 111 may also have a backside treatment agent applied to the backside (tape substrate surface 111a) of the tape substrate 111. Such backside treatment agents may be conventionally known, such as long-chain alkyl backside treatment agents.

<<Ink Layer 112>>
The ink layer 112 is usually a layer formed by directly coloring (including printing, etc.) the surface of the tape substrate 111 (the surface of the tape substrate 111 on the adhesive layer 114 side), but it may also be formed from a film colored with a specified colorant.

<<Primer Layer 113>>
The primer layer 113 can be, for example, as described in WO 2014/126158.

<<Adhesive Layer 114>>
The adhesive layer 114 contains an elastomer component and a filler, and typically further contains a tackifying resin.

The adhesive layer 114 may contain other components as needed.

A styrene-based elastomer is preferably used as the elastomer component. Below, we will explain an embodiment in which the elastomer component is a styrene-based elastomer, but the elastomer component may be composed of or contain an elastomer component other than a styrene-based elastomer.

Here, the adhesive layer 114 preferably has a thickness such that the amount of adhesive applied (mass per unit area as solid content excluding volatile components) is 10 to 50 g/ ^m2 , more preferably 15 to ⁴⁵ g/m2, even more preferably more than 20 g/ ^m2 but less than 40 g/ ^m2 , and particularly preferably 25 to 35 g/ ^m2 . By setting the amount of adhesive applied to the adhesive layer 114 containing a filler described below within this range, the distribution of the filler in the thickness direction in the adhesive layer 114 becomes appropriate, making it possible to further enhance the effects of the present invention.

<Styrene-based elastomer>
The styrene-based elastomer is not particularly limited, and examples thereof include styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylenebutylene-styrene block copolymer (SEBS), styrene-ethylenepropylene-styrene block copolymer (SEPS), styrene-ethyleneethylenepropylene-styrene block copolymer (SEEPS), and styrene-butadiene-butene-styrene block copolymer (SBBS). These may also be partially modified. These may be used alone or in combination of two or more.

The styrene-based elastomer may be in a form containing only a high-styrene-containing elastomer with a styrene content of more than 20% by mass, in a form containing only a low-styrene-containing elastomer with a styrene content of 20% by mass or less, or in a form containing both a high-styrene-containing elastomer and a low-styrene-containing elastomer, but a form containing both a high-styrene-containing elastomer and a low-styrene-containing elastomer is preferred.

The styrene content of the high-styrene-containing elastomer is preferably more than 20% by mass and less than 40% by mass, and more preferably 20% to 30% by mass.

The styrene content of the low-styrene-containing elastomer is preferably 12% to 20% by mass, and more preferably 15% to 18% by mass.

The ratio (El/Eh) of the content of low styrene-containing elastomer (El) to the content of high styrene-containing elastomer (Eh) in the pressure-sensitive adhesive layer 114 is preferably 2.0 or less, more preferably 1.5 or less, and particularly preferably 1.0 or less. The lower limit of El/Eh is not particularly limited, but can be, for example, 0.1, 0.2, 0.3, or 0.5.

The content of the styrene-based elastomer in the adhesive layer 114 is preferably 20 to 80% by mass, more preferably 30 to 70% by mass, and even more preferably 40 to 60% by mass.

<Filler>
Examples of fillers include calcium carbonate, zinc oxide (zinc oxide), aluminum silicate, silica, talc, diatomaceous earth, silica sand, pumice powder, slate powder, mica powder, aluminum sol, alumina white, aluminum sulfate, barium sulfate, lithopone, calcium sulfate, molybdenum disulfide, graphite, glass fiber, glass spheres, single crystal potassium titanate, carbon fiber, activated zinc oxide, zinc carbonate, magnesium oxide, basic magnesium carbonate, litharge, red lead, white lead, calcium hydroxide, activated calcium hydroxide, titanium oxide, graphite, etc. These may be used alone or in combination of two or more.

The filler preferably contains silica particles and/or calcium carbonate particles.

The total content of silica particles and calcium carbonate in the filler is preferably 50% by mass or more, more preferably 80% by mass or more, and particularly preferably 90% by mass or more.

The content ratio of silica particles to calcium carbonate particles (silica particle content/calcium carbonate particle content) is preferably 0.10 to 0.50, and more preferably 0.15 to 0.40.

Based on the total amount of filler, the proportion of filler with a particle size of 45 μm or more is preferably 0.5% by mass or more, and more preferably 1.0% by mass or more. There is no particular upper limit to the proportion of filler with a particle size of 50 μm or more, but it can be, for example, 25% by mass, 10% by mass, or 5% by mass.

Based on the total amount of filler, the proportion of filler with a particle size of 150 μm or more is preferably 1% by mass or less, 0.1% by mass or less, or 0.01% by mass or less. It is even more preferable that the proportion of filler with a particle size of 100 μm or more is 1% by mass or less, 0.1% by mass or less, or 0.01% by mass or less, based on the total amount of filler.

The average particle size of the entire filler is preferably 0.1 μm or more, 1 μm or more, 2 μm or more, or 5 μm or more, and is preferably 100 μm or less, 50 μm or less, 40 μm or less, 30 μm or less, or 10 μm or less. Here, the average particle size is the central diameter (50% diameter) in the mass-based distribution.

Here, the most preferred form is one in which the filler contains calcium carbonate particles and silica particles, the calcium carbonate particles have an average particle size of 1 to 10 μm, and the silica particles have an average particle size of more than 10 μm and not more than 50 μm.

By mixing multiple fillers with different average particle sizes, the particle size distribution of the filler can be adjusted.

To further enhance the effects of the present invention, the amount of filler in the adhesive layer 114 is preferably 5 to 30% by mass, more preferably 7 to 25% by mass, and particularly preferably 10 to 20% by mass.

Using such particles as fillers creates an appropriate unevenness near the adhesive surface, effectively contributing to reducing adhesion to the object being bound. Furthermore, by adjusting the filler particle size distribution, it is possible to reduce the amount of filler used compared to existing products, which is thought to reduce insertion resistance without impairing self-adhesion.

<Tackifying Resin>
The tackifying resin is not particularly limited, and examples thereof include rosin-based resins, terpene-based resins, aliphatic petroleum resins, alicyclic saturated hydrocarbon resins, aromatic petroleum resins, coumarone-indene resins, styrene-based resins, phenol-based resins, xylene resins, etc. These may be used alone or in combination of two or more.

To enhance the effects of the present invention, the tackifier resin preferably contains one or more of an alicyclic saturated hydrocarbon resin, a terpene resin, and a styrene resin, more preferably two or more of these, and even more preferably all of these.

The softening point of the alicyclic saturated hydrocarbon resin is preferably 90 to 140°C, and more preferably 120 to 140°C.

The softening point of the terpene resin is preferably 80 to 130°C, and more preferably 110 to 120°C.

The softening point of the styrene-based resin is preferably 100 to 140°C, and more preferably 110 to 130°C.

The content of the alicyclic saturated hydrocarbon resin in the total tackifier resin is preferably 30 to 80% by mass, more preferably 35 to 70% by mass, and particularly preferably 40 to 60% by mass.

The content of terpene resin relative to the total tackifier resin is preferably 10 to 50% by mass, more preferably 15 to 45% by mass, and particularly preferably 20 to 40% by mass.

The content of styrene-based resin in the total tackifier resin is preferably 1 to 40% by mass, more preferably 5 to 30% by mass, and particularly preferably 10 to 25% by mass.

The content of tackifier resin in the adhesive layer 114 is preferably 30 to 70% by mass, and more preferably 40 to 60% by mass.

<Other ingredients>
Examples of other components include known additives such as antioxidants, colorants, softeners, plasticizers, ultraviolet absorbers, antioxidants, etc. Furthermore, other components may include adhesive components other than styrene-based elastomers (e.g., rubber-based adhesives other than styrene-based elastomers, acrylic-based adhesives, silicone-based adhesives, etc.).

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

(Coloring agent)
The colorant may be either inorganic or organic, and may be added so as to achieve the desired color. 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 tackifying resins, synthetic plasticizers, etc. These may be used alone or in combination of two or more.

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

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

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

First, an adhesive liquid is prepared by adding an organic solvent or the like to the raw materials that make up the adhesive layer 114 as needed, and a tape substrate 111 with a micro-relief structure on at least one side is prepared.

Next, a printing process and a primer process are sequentially performed on the surface of the tape substrate 111 opposite the surface on which the micro-relief structure is formed, forming an ink layer 112 and a primer layer 113.

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

Finally, this adhesive tape member 110 is wound around the outer periphery of the core 120 to produce the self-adhesive adhesive tape roll 100.

<<<<Uses of the Self-Adhesive Adhesive Tape Roll 100>>>
The self-adhesive adhesive tape roll 100 has low tackiness, high self-adhesive binding properties, and low unwindability, and can therefore be used for a variety of purposes. For example, it can be used as an adhesive tape for binding various items such as fresh vegetables, fresh flowers, documents, newspapers, magazines, etc. The adhesive can also be impregnated into a substrate such as cloth or sprayed onto both sides, dried, wound, and cut into a tape roll, which can then be used as an adhesive bandage, sports fixation tape, sports anti-slip tape, etc.

The self-adhesive adhesive tape roll 100 has low tackiness and does not inhibit vegetable growth, making it suitable for use as a vegetable guide. Furthermore, the self-adhesive adhesive tape roll 100 has high self-adhesive binding properties, making it suitable for use in bundling applications where high loads are required. For example, in addition to guiding cucumbers and grapes, it can also be used to guide tomatoes and other vegetables.

Furthermore, because the self-adhesive adhesive tape roll 100 has low tack and low insertion resistance, it can be preferably used as a self-adhesive adhesive tape roll to be set into a dedicated tool for self-adhesive adhesive tape, such as that disclosed in Patent No. 6226880.

The present invention will be explained in more detail using the following examples and comparative examples, but the present invention is not limited to them.

＜＜Raw materials＞＞
<Styrene-based elastomer>
Low styrene SIS (styrene content: 16% by mass, Quintac 3433N manufactured by Zeon Corporation)
High styrene SBBS (styrene content: 25% by mass, Asahi Kasei Corporation, Asaprene ATN521)
<Tackifying Resin>
- Terpene resin (Yasuhara Chemical Co., Ltd.: YS Resin PX1150N)
Alicyclic saturated hydrocarbon resin (Arakawa Chemical Industries, Ltd.: Alcon P140)
- Styrene resin (Mitsui Chemicals: FTR2120)
<Filler>
Calcium carbonate (average particle size 1.5 μm, manufactured by Maruo Calcium Co., Ltd.: Super #1500)
Silica particles 1 (average particle diameter 13 to 15 μm, manufactured by Tosoh Silica Corporation: NIPGEL BY-001)
Silica particles 2 (average particle diameter 30 to 40 μm, manufactured by Tosoh Silica Corporation: Nipsil VN3 ^#100 )
<Other ingredients>
- Antioxidant (Seiko Chemical Co., Ltd.: Nonflex EBP)

<<Production of Adhesive Tape Rolls According to Examples and Comparative Examples>>
A 70 μm thick CPP film having a fine uneven structure (arithmetic mean roughness (Ra) 2.9 μm, ten-point mean roughness (Rz) 29.7 μm, matte surface) on one side was prepared.
Next, an ink layer (colored layer) and a primer layer were sequentially formed on the surface of the CPP film opposite to the surface having the microrelief structure. An adhesive tape with a width of 11 mm was then prepared by applying the adhesive shown in each table onto the primer layer in the amount shown in each table.
The film was wound up so that the matte surface of the film was in contact with the adhesive layer, to prepare an adhesive tape roll having a width of 11 mm according to each of the Examples and Comparative Examples.

In Example 1, the proportion of fillers having particle sizes of 45 μm or more based on the total amount of fillers was 1 mass %.
In Examples 2, 4, and 5, the proportion of fillers having particle sizes of 45 μm or more was 2 mass % based on the total amount of fillers.
In Example 3, the proportion of fillers having particle sizes of 45 μm or more based on the total amount of fillers was 3 mass %.
In Comparative Example 1, the proportion of fillers having particle sizes of 45 μm or more based on the total amount of fillers was 0 mass %.
In Comparative Examples 2, 3, and 5 to 7, the proportion of fillers having particle sizes of 45 μm or more based on the total amount of fillers was 0.2 mass %.
In Comparative Example 4, the proportion of fillers having particle sizes of 45 μm or more based on the total amount of fillers was 0.3 mass %.

In Examples 1, 2, 4, and 5, the proportion of filler having a particle size of 100 μm or more was 0% by mass.
In Example 3, the proportion of filler having a particle size of 100 μm or more was 0.1% by mass.

In Example 1, the median diameter (by mass) of the entire filler was 5 μm.
In Examples 2, 4, and 5, the median diameter (by mass) of the entire filler was 6 μm.
In Example 3, the median diameter (by mass) of the entire filler was 7 μm.

<<Evaluation>>
The pressure-sensitive adhesive tape rolls according to the examples and comparative examples were evaluated for probe tack, self-adhesive strength, self-adhesive retention strength, and insertion resistance according to the following methods. The results of the evaluations are shown in the table below.

<Probe tack test>
A probe tack test was carried out in accordance with ASTM D2979 under conditions of 23° C. and 50% RH using the example tape (11 mm wide) as a test piece.
Specifically, the test piece was attached to a weight ring without any slack, and a cylindrical probe with a diameter of 5 mm was brought into contact with the adhesive surface of the test piece at a contact speed of 10±0.1 mm/sec for 1.0±0.01 seconds under a load of 0.98±0.001 N/ ^cm2 , and then the force (N/5 mmφ) required to peel the probe perpendicularly from the adhesive surface at the same speed as the contact speed was measured.

<Self-adhesion test>
The collected test pieces (11 mm wide adhesive tapes) are stuck together with the adhesive side facing inward, taking care not to stretch the test pieces or trap air bubbles. The stuck length is 100 mm or more.
Next, a 2 kg pressure roller is used to press the test piece back and forth at a pressing speed of about 300 mm per minute, and the test piece is left to stand for 20 to 40 minutes.
Thereafter, the test piece was fixed to an Instron type tensile tester, and the test piece was peeled at a peel rate of 300 mm/min, and the resulting peel force (N/11 mm) was measured.

<Self-adhesion retention test>
The collected test pieces (11 mm wide adhesive tapes) are stuck together with the adhesive side facing inward, taking care not to stretch the test pieces or trap air bubbles. The stuck length is 100 mm or more.
Next, a 2 kg pressure roller is used to press the test piece back and forth at a pressing speed of about 300 mm per minute, and the test piece is left to stand for 20 to 40 minutes.
Thereafter, one end of the test piece is fixed and a weight is hung on the other end as shown in Figure 3. Before hanging the weight, the bonded portion is peeled off by about 5 mm and the boundary is marked with a marker or the like.
After the specified time, with the weights still attached, the deviation distance (between the marks on the marker, etc.) is read with a vernier caliper.

<Insertion resistance>
The insertion resistance was measured under two conditions: low temperature and low humidity conditions of 23°C and 50% RH, and high temperature and high humidity conditions of 40°C and 75% RH.
First, in accordance with the standard method of use of the Tometatsu (registered trademark) TMA100 induction binding machine (manufactured by Nichiban Co., Ltd.), the adhesive tape roll (width 11 mm) of each Example and Comparative Example was set on the TMA100. At this time, the leading end of the adhesive tape unwound from the adhesive tape roll was fixed to the end of the TMA100.
Next, a DSV-50N (manufactured by Imada Co., Ltd.) is prepared as a measuring device, and a T-shaped measuring part (an attachment connected to a 10 mm diameter steel pipe support) is set in it.
The adhesive tape fixed to the TMA100 is pressed against the T-shaped measuring part of the DSV-50N, and the resistance value (maximum load) is measured and taken as the insertion resistance.
It is believed that the insertion resistance is influenced by a combination of factors, such as the ability of the adhesive tape roll to unravel when actually attracting plants, and the friction caused by contact between TMA100 and the adhesive layer of the adhesive tape, and is therefore an evaluation that is directly linked to the overall user experience when using dedicated equipment such as TMA100.

100 Self-adhesive adhesive tape roll body 110 Adhesive tape member 111 Tape substrate 111a Tape substrate surface 112 Ink layer (colored layer)
113 primer layer 114 adhesive layer 114a adhesive layer surface 120 shaft core

Claims (3)

A self-adhesive adhesive tape roll body obtained by winding an adhesive tape member having a tape-shaped substrate and an adhesive layer provided on one side of the tape-shaped substrate directly or via another layer,
the pressure-sensitive adhesive layer contains a filler,
The content of the filler having a particle size of 45 μm or more is 0.5% by mass or more based on the total amount of the filler,
A self-adhesive adhesive tape roll body, characterized in that the average particle diameter of the filler is 0.1 to 10 μm . The self-adhesive adhesive tape roll according to claim 1 , wherein the filler comprises silica particles and calcium carbonate particles. The self-adhesive adhesive tape roll according to claim 1 or 2 , wherein the adhesive layer has a coating amount of 25 to 35 g/m ² .