JP7770227B2 - Pseudo-adhesive labels - Google Patents

Description

The present invention relates to pseudo-adhesive labels.

Pseudo-adhesive labels are labels that, after being attached to an adherend, can be easily peeled from the substrate starting from the pseudo-adhesive interface. Pseudo-adhesive labels are used in practical applications, such as delivery slips and information-hiding labels.

For example, Patent Document 1 describes a pseudo-adhesive label that has a substrate, a pseudo-adhesive layer containing a thermoplastic resin with a crystallinity of 22.5% or less, and an adhesive layer containing a tackifier resin, and in which the pseudo-adhesive strength of the pseudo-adhesive layer to the substrate is within a specified range.

Japanese Patent Application Laid-Open No. 2020-160308

However, due to the nature of pseudo-adhesive labels, there is a problem in that the substrate can unintentionally peel off due to slight external forces during transportation and storage. However, there is also a need for the substrate to be able to be peeled off easily when intended.

The object of the present invention is to provide a pseudo-adhesive label that prevents unintentional peeling of the substrate while allowing for easy intentional peeling of the substrate.

One aspect of the present invention provides a pseudo-adhesive label having a substrate, a first layer, a second layer, and an adhesive layer in this order, where the first layer is a pseudo-adhesive layer containing a first aqueous resin, a metal soap, and a first paper powder, and the second layer contains a second aqueous resin.

In one embodiment of the pseudo-adhesive label of the present invention, the first aqueous resin is preferably one or more selected from the group consisting of ethylene-vinyl acetate copolymer resin, polyurethane resin, polyethylene resin, polyvinyl alcohol resin, and vinyl acetate resin.

In one embodiment of the pseudo-adhesive label of the present invention, the metal soap is preferably a fatty acid metal salt.

In one embodiment of the pseudo-adhesive label of the present invention, the fatty acid metal salt is preferably calcium stearate or zinc stearate.

In one embodiment of the pseudo-adhesive label of the present invention, the first paper powder is preferably one or more selected from the group consisting of cellulose powder, pulp, and paper shavings.

In one embodiment of the pseudo-adhesive label of the present invention, the second aqueous resin is preferably one or more selected from the group consisting of ethylene-vinyl acetate copolymer resin, polyurethane resin, polyethylene resin, polyvinyl alcohol resin, and vinyl acetate resin.

In a pseudo-adhesive label according to one embodiment of the present invention, the blending ratio of the first aqueous resin, the metal soap, and the first paper powder in the first layer is preferably 0.5:1.5:8 to 3:3.5:3.5.

In the pseudo-adhesive label according to one aspect of the present invention, the coating amount of the first layer is preferably 4 g/m ² or more and 8 g/m ² or less.

In the pseudo-adhesive label according to one aspect of the present invention, the coating amount of the second layer is preferably 4 g/m ² or more and 30 g/m ² or less.

In one aspect of the pseudo-adhesive label of the present invention, the substrate is preferably heat-sensitive paper or pressure-sensitive paper.

In a pseudo-adhesive label according to one embodiment of the present invention, it is preferable that the first layer be in direct contact with the substrate on one side and that the first layer be in direct contact with the second layer on the other side.

In one aspect of the pseudo-adhesive label of the present invention, it is preferable that the first layer undergoes cohesive failure when the substrate is peeled from the first layer.

The pseudo-adhesive label according to one embodiment of the present invention preferably exhibits a peel strength of 1300 mN/25 mm or more when the substrate is peeled from the first layer at a peel speed of 0.3 m/min and a peel angle of 180 degrees, in accordance with JIS Z0237:2009, and a peel strength of 1500 mN/25 mm or less when the substrate is peeled from the first layer at a peel speed of 30 m/min and a peel angle of 180 degrees.

It is preferable that the pseudo-adhesive label according to one embodiment of the present invention further comprises a release liner, and the adhesive layer is adhered to the release liner.

One aspect of the present invention provides a pseudo-adhesive label that can be easily peeled off intentionally while preventing unintentional peeling of the substrate.

1 is a cross-sectional schematic view of a pseudo-adhesive label according to one embodiment of the present invention. 1 is a schematic cross-sectional view showing a pseudo-adhesive label according to one embodiment of the present invention attached to an adherend. 1 is a schematic cross-sectional view illustrating a state in which a substrate is peeled off from a pseudo-adhesive label according to one embodiment of the present invention.

The present invention will be described below using an embodiment relating to one aspect of the present invention as an example, but the present invention is not limited to this embodiment.

[Embodiment according to one aspect of the present invention]
<Pseudo adhesive label>
The pseudo adhesive label according to this embodiment has a substrate, a first layer, a second layer, and an adhesive layer in this order.
1 shows a schematic cross-sectional view of a pseudo adhesive label 1 according to this embodiment. In the pseudo adhesive label 1 according to this embodiment, a substrate 10, a first layer 20, a second layer 30, and an adhesive layer 40 are laminated in this order. The first layer 20 is in direct contact with the substrate 10 on one side and in direct contact with the second layer 30 on the other side.

Furthermore, as shown in FIG. 1, the pseudo-adhesive label 1 according to this embodiment further includes a release liner RL. In the pseudo-adhesive label 1 according to this embodiment, the adhesive layer 40 is attached to the release liner RL. Note that the pseudo-adhesive label according to the present invention is not limited to having a release liner RL.

The shape of the pseudo adhesive label 1 is not particularly limited. Examples of shapes of the pseudo adhesive label 1 in plan view include polygons (e.g., rectangles and triangles), circles, ellipses, and irregular shapes.

(Base material)
The substrate 10 has a first substrate surface 10A and a second substrate surface 10B opposite to the first substrate surface 10A, and the first substrate surface 10A is in direct contact with the first layer 20.
The substrate 10 of the pseudo adhesive label 1 according to this embodiment is not particularly limited.
The substrate 10 is appropriately selected from substrates used in conventional pseudo adhesive labels depending on the intended use of the pseudo adhesive label 1 .
In the pseudo adhesive label 1, the substrate 10 is an information display substrate that displays information about the adherend. For example, if the adherend is a delivery, the information about the adherend may include the name or title of the sender, destination, and delivery company, address, telephone number, and contents of the delivery.

Examples of the substrate 10 include paper, resin film, synthetic paper, and laminated sheets in which two or more layers of these are laminated together.
Examples of papers that can be used as the substrate 10 include thermal paper, pressure-sensitive paper, kraft paper, fine paper, glassine paper, parchment paper, rayon paper, coated paper, and synthetic fiber paper.
Examples of resin films that can be used as the substrate 10 include films of polyester-based resins, polyvinyl chloride-based resins, polyvinylidene chloride-based resins, and polyolefin-based resins.
Examples of synthetic paper that can be used as the substrate 10 include polypropylene film and polyester film. Polypropylene film and polyester film appear white when voids are included, making it easy to control the appearance depending on the application.

The substrate 10 is preferably a paper substrate made of paper or synthetic paper, more preferably thermal paper, pressure-sensitive paper, kraft paper, fine paper, or glassine paper, and even more preferably thermal paper or pressure-sensitive paper.

When the substrate 10 is a paper substrate, the basis weight is preferably 10 g/ ^m2 or more, and more preferably 15 g/ ^m2 or more. The basis weight of the paper substrate is preferably 200 g/ ^m2 or less, and more preferably 150 g/ ^m2 or less. According to the pseudo adhesive label 1 of this embodiment, even if the substrate 10 is a paper substrate within this basis weight range, substrate tearing when the substrate is peeled off can be suppressed.

The thickness of the substrate 10 is selected appropriately depending on the application of the pseudo-adhesive label 1. From the standpoint of ease of handling, the thickness of the substrate 10 is preferably 10 μm or more and 250 μm or less, more preferably 20 μm or more and 200 μm or less, and even more preferably 30 μm or more and 150 μm or less.

The second substrate surface 10B may be printed. If the second substrate surface 10B can be printed, the pseudo-adhesive label 1 can be used as a delivery label, etc.

(First layer)
The first layer 20 is a pseudo-adhesive layer and is pseudo-adhered to the substrate 10 .
In this specification, "pseudo-adhesion" refers to an adhesion in which one layer and the other layer are bonded together under specific conditions (for example, a combination of materials and a temperature range) and can be easily peeled off by interfacial peeling or interlayer cleavage (cohesive failure, etc.), and the layer does not exhibit re-adhesion or re-stickiness after peeling.

The first layer 20 contains a first water-based resin, a metal soap, and a first paper powder.
In this specification, the term "water-based resin" refers to a resin that can be dissolved or dispersed in a solvent containing water, and the term "paper powder" refers to powdery or thread-like (fibrous) fine solid matter derived from paper.

First Water-Based Resin Examples of the first water-based resin include ethylene-vinyl acetate copolymer resin, polyurethane resin, polyethylene resin, polyvinyl alcohol resin, and vinyl acetate resin.
From the viewpoint of exhibiting an appropriate pseudo-adhesive strength, the first aqueous resin is preferably one or more selected from the group consisting of an ethylene-vinyl acetate copolymer resin, a polyurethane resin, a polyethylene resin, a polyvinyl alcohol resin, and a vinyl acetate resin, and is more preferably an ethylene-vinyl acetate copolymer resin.

To achieve a pseudo-adhesion strength sufficient to allow easy peeling by hand, the first layer 20 preferably contains 5% by mass or more of the first aqueous resin, more preferably 10% by mass or more, and even more preferably 15% by mass or more. Furthermore, to prevent excessive adhesion, the first layer 20 preferably contains 50% by mass or less of the first aqueous resin, more preferably 40% by mass or less, and even more preferably 30% by mass or less.

Metal soap Examples of metal soaps include fatty acid metal salts. By incorporating a metal soap, the first layer 20 is more likely to be coagulated and destroyed when the substrate 10 is peeled off from the pseudo-adhesive label 1.
Examples of fatty acid metal salts include calcium stearate, calcium palmitate, zinc stearate, zinc laurate, etc. The fatty acid in the fatty acid metal salt may be a mixed fatty acid containing a plurality of fatty acids with different carbon numbers.

From the perspective of imparting cohesive failure properties, the first layer 20 preferably contains 10% by mass or more of metal soap, more preferably 20% by mass or more, and even more preferably 30% by mass or more. Furthermore, to avoid impairing adhesive properties, the first layer 20 preferably contains 60% by mass or less of metal soap, more preferably 50% by mass or less, and even more preferably 40% by mass or less.

First Paper Powder Examples of the first paper powder include cellulose powder, pulp, and paper cutting waste.
The incorporation of the first paper powder improves the ease of writing and printing (hereinafter referred to as "writability") of characters and the like on the surface of the first layer 20 exposed after the base material 10 is peeled off and cohesively fractured, and also improves hand tearability, such that after the pseudo-adhesive label 1 is affixed to a final product, the label can be easily torn by hand when disposing of the final product.
In order to impart speed dependency to the peel force when peeling the substrate 10, such that the low-speed peel force is high and the high-speed peel force is low, the first paper powder is preferably one or more selected from the group consisting of cellulose powder, pulp, and paper shavings.

The size of the first paper powder is not particularly limited, but for example, if the first paper powder is powdery, it is preferable that its particle size be 1 μm or more and 100 μm or less. Also, for example, if the first paper powder is fibrous, it is preferable that its major axis be 1 μm or more and 100 μm or less.

To impart speed dependency to the peel force when peeling the substrate 10, i.e., high low-speed peel force and low high-speed peel force, the first layer 20 preferably contains 30% by mass or more of the first paper powder, more preferably 40% by mass or more, and even more preferably 50% by mass or more. Furthermore, from the perspective of the formability (film-forming ability) of the first layer, the first layer 20 preferably contains 90% by mass or less of the first paper powder, more preferably 80% by mass or less, and even more preferably 70% by mass or less.

The first layer 20 may be a layer made of only the first aqueous resin, the metal soap, and the first paper powder.
Alternatively, the first layer 20 may contain other components such as additives in addition to the first aqueous resin, metal soap, and first paper powder, as long as the effects of this embodiment are not impaired.

Other Components For example, the first layer 20 may contain a filler. Examples of fillers include calcium carbonate, talc, kaolin, calcium hydroxide, alumina, titanium oxide, and zinc oxide. Furthermore, for example, the first layer 20 may contain a dispersant. Examples of dispersants include sodium polyacrylate, sodium polycarboxylate, and ammonium polycarboxylate. Furthermore, for example, the first layer 20 may contain a surfactant or the like.

In order to exhibit a pseudo-adhesion strength that allows peeling by hand with a moderate force, the blending ratio of the first aqueous resin, the metal soap, and the first paper powder in the first layer 20 is preferably 0.5:1.5:8 to 3:3.5:3.5.
That is, when the total content of the first aqueous resin, metal soap, and first paper powder in the first layer 20 is 100% by mass, the content of the first aqueous resin is preferably 5% by mass or more and 30% by mass or less, the content of the metal soap is preferably 15% by mass or more and 35% by mass or less, and the content of the first paper powder is preferably 35% by mass or more and 80% by mass or less.

The thickness of the first layer 20 is not particularly limited. The thickness of the first layer 20 is preferably 1 μm or more and 50 μm or less, more preferably 3 μm or more and 40 μm or less, even more preferably 5 μm or more and 40 μm or less, even more preferably 7 μm or more and 30 μm or less, and even more preferably 10 μm or more and 25 μm or less.

The coating amount of the first layer 20 is preferably 4 g/ ^m2 or more and 8 g/ ^m2 or less. If the coating amount of the first layer 20 is 4 g/ ^m2 or more, the peeling force when peeling the substrate 10 does not become too high, and peeling can be easily performed. Furthermore, if the coating amount of the first layer 20 is 8 g/ ^m2 or less, unintended peeling of the substrate 10 can be more effectively prevented.

(Second layer)
The second layer 30 contains at least a second aqueous resin. Examples of the second aqueous resin include the same resins as the first aqueous resin described above.
The first aqueous resin and the second aqueous resin may be the same type of resin or different types of resin, but are preferably the same type of resin.

In order to provide a resin layer with high film-forming properties and tensile strength to protect the pressure-sensitive adhesive layer, the second aqueous resin is preferably one or more selected from the group consisting of ethylene-vinyl acetate resin, polyurethane resin, polyethylene resin, and polyvinyl alcohol resin, and is preferably ethylene-vinyl acetate resin.

To prevent cohesive failure, the second layer 30 preferably contains 40% by mass or more of the second aqueous resin, more preferably 50% by mass or more, and even more preferably 60% by mass or more. Furthermore, from the standpoint of coatability and drying properties during film formation, the second layer 30 preferably contains 90% by mass or less of the second aqueous resin, more preferably 80% by mass or less, and even more preferably 70% by mass or less.

The second layer 30 may be a layer made only of the second aqueous resin.
Alternatively, the second layer 30 may contain a component other than the second aqueous resin as long as the effect of the present embodiment is not impaired. For example, the second layer 30 may contain second paper powder as a component other than the second aqueous resin. Also, for example, the second layer 30 may contain an additive or the like as a component other than the second aqueous resin.
The second paper powder, additives, etc. that the second layer 30 may contain include the same paper powder, additives, etc. as the first paper powder, additives, etc. in the first layer 20 described above.
It is also preferred that the second layer 30 does not contain metal soaps.

The thickness of the second layer 30 is not particularly limited. The thickness of the second layer 30 is preferably 1 μm or more and 50 μm or less, more preferably 3 μm or more and 40 μm or less, even more preferably 5 μm or more and 40 μm or less, even more preferably 7 μm or more and 30 μm or less, and even more preferably 10 μm or more and 25 μm or less.

From the viewpoint of preventing the adhesive from seeping out from the surface of the first layer 20 exposed due to cohesive failure caused by peeling off the substrate 10, the coating amount of the second layer 30 is preferably 4 g/ ^m2 or more. There is no particular upper limit, but it can be, for example, 30 g/ ^m2 or less.

(Adhesive layer)
The pressure-sensitive adhesive layer 40 is formed from a pressure-sensitive adhesive composition. The pressure-sensitive adhesive composition that forms the pressure-sensitive adhesive layer 40 preferably contains a tackifier resin. The pressure-sensitive adhesive composition that forms the pressure-sensitive adhesive layer 40 preferably contains a known pressure-sensitive adhesive. Examples of pressure-sensitive adhesives that are configured in combination with a tackifier resin in the pressure-sensitive adhesive layer 40 include acrylic pressure-sensitive adhesives, natural rubber pressure-sensitive adhesives, synthetic rubber pressure-sensitive adhesives, and silicone pressure-sensitive adhesives.

The thickness of the adhesive layer 40 is selected appropriately depending on the application of the pseudo adhesive label 1. The thickness of the adhesive layer 40 is preferably 1 μm or more and 50 μm or less, more preferably 5 μm or more and 50 μm or less, even more preferably 10 μm or more and 40 μm or less, even more preferably 10 μm or more and 30 μm or less, and even more preferably 10 μm or more and 20 μm or less.

(Release liner)
The release liner RL protects the adhesive layer 40 until the pseudo adhesive label 1 is attached to an adherend.
There are no particular limitations on the release liner RL as long as it can be used by being attached to the adhesive layer 40 of the pseudo adhesive label 1. The release treatment layer can be formed by applying a release agent to the surface of the release liner substrate.

Examples of the substrate for the release liner include paper and plastic films.
Examples of papers include fine paper, glassine paper, and kraft paper. Examples of plastic films include polyester resin films and polyolefin resin films. Examples of polyester resin films include films of polyethylene terephthalate resin, polybutylene terephthalate resin, and polyethylene naphthalate resin. Examples of polyolefin resin films include films of polypropylene resin and polyethylene resin.
The papers and plastic films used as the substrate for the release liner may be the same as or different from the papers and plastic films exemplified in the description of the substrate 10 of the pseudo adhesive label 1 .

Examples of release agents include rubber elastomers such as silicone resins, olefin resins, isoprene resins, and butadiene resins, long-chain alkyl resins, alkyd resins, and fluorine-based resins.

There are no particular restrictions on the thickness of the release liner RL. The thickness of the release liner RL is preferably 10 μm or more and 200 μm or less, more preferably 25 μm or more and 170 μm or less, even more preferably 30 μm or more and 150 μm or less, even more preferably 35 μm or more and 100 μm or less, and even more preferably 35 μm or more and 80 μm or less.

In the pseudo-adhesive label 1 according to this embodiment, the first layer 20 undergoes cohesive failure when the substrate 10, which serves as one layer, is peeled from the other layer, the first layer 20. The surfaces exposed by the cohesive failure of the first layer 20 (the surface of the first layer 20 that is peeled off together with the substrate 10 and the surface of the first layer 20 that remains on the second layer 30) do not exhibit re-adhesion or re-stickiness.

It is preferable that the peel force of the pseudo adhesive label 1 when peeling the substrate 10 from the first layer 20 decreases as the peel speed increases. In other words, it is preferable that the slower the peel speed when peeling the substrate 10 from the first layer 20, the more difficult it is for the substrate 10 to peel from the first layer 20, and the faster the peel speed when peeling the substrate 10 from the first layer 20, the easier it is for the substrate 10 to peel from the first layer 20. In this way, if the peel force when peeling the substrate 10 at a low speed is high, unintended peeling during storage can be prevented. Furthermore, if the peel force when peeling the substrate 10 at a high speed is low, the substrate 10 can be easily peeled from the first layer 20.

More specifically, the pseudo-adhesive label 1 has a peel force (hereinafter sometimes referred to as "peel force R1") when the substrate 10 is peeled from the first layer 20 in accordance with JIS Z0237:2009 at a peel speed of 0.3 m/min and a peel angle of 180 degrees, of preferably 1300 mN/25 mm or more, more preferably 1350 mN/25 mm or more, and even more preferably 1400 mN/25 mm or more. There is no particular upper limit for the peel force R1, but in order to facilitate peel triggering, it is preferably 5000 mN/25 mm or less.
Furthermore, the pseudo-adhesive label 1 has a peel force (hereinafter sometimes referred to as "peel force R2") when the substrate 10 is peeled from the first layer 20 in accordance with JIS Z0237:2009 at a peel speed of 10 m/min and a peel angle of 180 degrees, of preferably 800 mN/25 mm or more, more preferably 850 mN/25 mm or more, and even more preferably 900 mN/25 mm or more. Furthermore, the peel force R2 is preferably 2200 mN/25 mm or less, more preferably 2150 mN/25 mm or less, and even more preferably 2100 mN/25 mm or less.
Furthermore, the pseudo-adhesive label 1 has a peel force (hereinafter sometimes referred to as "peel force R3") when the substrate 10 is peeled from the first layer 20 in accordance with JIS Z0237:2009 at a peel speed of 30 m/min and a peel angle of 180 degrees, of preferably 1500 mN/25 mm or less, more preferably 1450 mN/25 mm or less, and even more preferably 1400 mN/25 mm or less. There is no particular lower limit for the peel force R3, but from the viewpoint of an appropriate peel feel when peeled by hand, it is preferably 200 mN/25 mm or more.

The pseudo-adhesive label 1 conforms to JIS Z0237:2009 and preferably exhibits a peel strength of 1300 mN/25 mm or more when the substrate 10 is peeled from the first layer 20 at a peel speed of 0.3 m/min and a peel angle of 180 degrees, and a peel strength of 1500 mN/25 mm or less when the substrate 10 is peeled from the first layer 20 at a peel speed of 30 m/min and a peel angle of 180 degrees.

<Method of manufacturing pseudo adhesive label>
The pseudo adhesive label 1 according to this embodiment can be manufactured by a manufacturing method including the following steps P1, P2, and P3, for example.

Process P1 is a process of laminating a first layer 20, which is a pseudo-adhesive layer, on a substrate 10. The laminate produced in process P1 (a laminate in which the substrate 10 and the first layer 20 are laminated) may be referred to as a "first laminate" hereinafter.
Step P2 is a step of laminating the second layer 30 onto the first laminate obtained in step P1. The laminate produced in step P2 (a laminate in which the second layer 30 is further laminated onto the first laminate) may be referred to as a "second laminate" hereinafter.
Step P3 is a step of laminating a pressure-sensitive adhesive layer 40 onto the second laminate obtained in step P2.

・Process P1
First, the process P1 will be described.
In step P1, the first layer 20 is laminated on the first substrate surface 10A side of the substrate 10. The method for laminating the first layer 20 on the substrate 10 is not particularly limited.
For example, the method for producing the pseudo adhesive label 1 according to this embodiment includes, as step P1, a step of coating the substrate 10 with a material constituting the first layer 20. In the method for producing the pseudo adhesive label 1 according to this embodiment, the material constituting the first layer 20 is a material obtained by dissolving or dispersing at least a water-based resin, a metal soap, and a first paper powder in water or a mixed solution of water and a water-soluble solvent (e.g., alcohols, acetone, dimethylformamide, etc.). By laminating the first layer 20 on the substrate 10 by coating, the adhesive strength at the interface between the substrate 10 and the first layer 20 can be increased, and as a result, cohesive failure in the first layer 20 is more likely to occur when the substrate 10 is peeled off.

Methods for coating the material constituting the first layer 20 onto the substrate 10 include, for example, spray coating, bar coating, knife coating, roll knife coating, roll coating, blade coating, die coating, and gravure coating.

Process P1 also includes a process (drying process) for drying the material (coating) constituting the first layer 20 coated on the substrate 10. The drying temperature for the coating is preferably 60°C or higher and 140°C or lower. Furthermore, the drying time for the coating is preferably 30 seconds or higher and 2 minutes or lower.

As described above, the first laminate can be obtained through process P1, which includes the coating and drying processes.

・Process P2
Next, step P2 will be described.
In process P2, the second layer 30 is laminated on the first layer 20 of the first laminate. As a method for laminating the second layer 30 on the first layer 20, for example, similar to the method for laminating the first layer 20 described above, a method in which the material constituting the second layer 30 is coated on the first layer 20 and then dried can be mentioned. As with the first layer 20, by laminating the second layer 30 on the first layer 20 by coating, the adhesive strength at the interface between the first layer 20 and the second layer 30 can be increased.

・Process P3
Next, step P3 will be described.
In step P3, a pressure-sensitive adhesive layer 40 is laminated on the second layer 30 of the second laminate.

Specifically, an adhesive composition containing materials for forming the adhesive layer 40 is applied to the release-treated surface of the release liner RL, forming the adhesive layer 40 on the release liner RL. The adhesive composition in process P3 contains a tackifier resin and an adhesive. The adhesive layer 40 formed on the release liner RL is then attached to the surface of the second layer 30 in the second laminate, thereby producing the pseudo-adhesive label 1.

Alternatively, the pseudo-adhesive label 1 can also be produced by applying an adhesive composition to the surface of the second layer 30 of the second laminate to form an adhesive layer 40, and then attaching a release liner RL to the adhesive layer 40.

Methods for applying the pressure-sensitive adhesive composition include, for example, roll coating, bar coating, knife coating, roll knife coating, blade coating, die coating, and gravure coating.

From the perspective of improving adhesion between the second layer 30 and the pressure-sensitive adhesive layer 40 in the second laminate, it is preferable to form the pressure-sensitive adhesive layer 40 after subjecting the surface of the second layer 30 in the second laminate to a corona treatment or the like.

The pseudo adhesive label 1 may be subjected to punching processing as appropriate.
The punching process may be performed by, for example, punching out the entire label together with the release liner RL using a punching blade that follows the outline of the predetermined label.
Alternatively, cuts may be made from the substrate 10 to the adhesive layer 40 so as not to punch out the release liner RL, and a plurality of pseudo adhesive labels 1 may be arranged on the release liner RL. In this case, the cuts made by punching may penetrate into the release liner RL to an extent that the release liner RL is not punched out and falls off.
If necessary, unnecessary portions around the outer periphery of each pseudo adhesive label 1 may be removed from the release liner RL.

<Applications of pseudo adhesive labels>
FIG. 2 is a schematic cross-sectional view showing the pseudo adhesive label 1 attached to the adherend 100. As shown in FIG.
The pseudo adhesive label 1 according to this embodiment can be peeled at the interface between the adhesive layer 40 and the release liner RL. As shown in Figure 2, after being separated from the release liner RL, the adhesive layer 40 of the pseudo adhesive label 1 is attached to the adherend 100.

When the pseudo-adhesive label 1 is used as a delivery slip, the adherend 100 can be, for example, a delivery item. A delivery item typically consists of the item to be delivered and packaging material in which the item is packaged. Examples of packaging material include wrapping paper, packaging film, packaging boxes, and packaging containers. Packaging materials include cardboard, paper, plastic, and metal. Because the pseudo-adhesive label 1 is attached to the packaging material of the delivery item, the adhesive layer 40 has appropriate adhesive strength to the packaging material.

Figure 3 is a schematic cross-sectional view showing the state in which the substrate 10 is being peeled off from the pseudo-adhesive label 1 attached to the adherend 100.

The pseudo adhesive label 1 according to this embodiment is used, for example, as a delivery slip. When the pseudo adhesive label 1 is used as a delivery slip, the entire base material 10 may be peeled off as a receipt.
Furthermore, when the pseudo adhesive label 1 is used as a delivery slip, it is also preferable that the substrate 10 of the pseudo adhesive label 1 is divided into multiple label pieces, for example, by a slit. For example, if the substrate 10 is divided into two by a slit, one label piece can be used as a delivery slip and the other label piece can be used as a receipt. The label piece serving as a receipt is usually peeled off after a stamp or signature is applied, as the first layer 20 undergoes cohesive failure. The other label piece remains on the delivery item or the box or container in which the delivery item is packed.
The receipt peeled off from the pseudo adhesive label 1 is used by a delivery company or the like to organize delivery slips, etc.
After the substrate 10 is peeled off, characters or the like can be written or printed on the surface of the first layer 20 remaining on the adherend 100 such as a packaging material using a pencil, mechanical pencil, or water-based ballpoint pen.

[Effects of this embodiment]
The pseudo adhesive label 1 according to this embodiment can easily peel off the substrate 10 when intended, while preventing the substrate 10 from peeling off unintentionally.
Furthermore, the pseudo adhesive label 1 according to this embodiment also has excellent releasability when peeling the substrate 10 from the first layer 20 and excellent writability on the surface of the first layer 20 after the substrate 10 has been peeled off.
Furthermore, the pseudo adhesive label 1 according to this embodiment is also excellent in terms of ease of tearing by hand.

The present invention will be explained in more detail below using examples. However, the present invention is not limited to these examples in any way.

[Preparation of pseudo-adhesive labels]
Example 1
Aqueous fatty acid calcium carbonate was blended with aqueous ethylene-vinyl acetate copolymer resin (EVA-1), followed by blending with cellulose powder dispersed in water at a concentration of 50% by mass. As shown in Table 1, the blending amounts (solid content ratio) in Example 1 were 10% by mass of EVA-1, 20% by mass of fatty acid calcium carbonate, and 70% by mass of cellulose powder. Further water was then added to prepare a coating solution for forming a first layer (solid content concentration: 25% by mass). This coating solution was then applied to the non-thermal coated surface of thermal paper as a substrate using a #6 Meyer bar. After coating, the coating was dried by heating at 70°C for 30 seconds to form a first layer.
Next, water was added to the aqueous ethylene-vinyl acetate copolymer resin (EVA-2) to prepare a coating liquid for forming a second layer (solid content concentration: 25% by mass), and the coating liquid was applied onto the first layer using a Mayer bar #8. After coating, the coating was dried by heating at 70°C for 30 seconds to form a second layer.
Separately, an adhesive was applied to a release liner to form an adhesive layer, and then the adhesive layer was attached to the second layer with a hand roller so that the adhesive layer was in contact with the second layer, thereby producing a pseudo-adhesive label.

Example 2
A pseudo-adhesive label was prepared in the same manner as in Example 1, except that the coating amounts of the first layer and the second layer were changed as shown in Table 1.

Example 3
Each pseudo-adhesive label was prepared in the same manner as in Example 1, except that the coating amount of the first layer was changed as shown in Table 1.

(Examples 4 and 5)
Each pseudo-adhesive label was produced in the same manner as in Example 1, except that the blending amounts of each component in the first layer were changed as shown in Table 1.

(Comparative Example 1)
A pseudo-adhesive label was produced in the same manner as in Example 1, except that the first layer was not formed, and the second layer was formed by heating and melting an ethylene-vinyl acetate copolymer resin (EVA-3, vinyl acetate content 7% by mass) to 260°C and extruding it.

(Comparative Example 2)
Each pseudo-adhesive label was prepared in the same manner as in Example 1, except that the cellulose powder was not used in the first layer and the blending amounts of each component were changed as shown in Table 1.

(Comparative Example 3)
Each pseudo-adhesive label was produced in the same manner as in Example 1, except that in the first layer, 70% by mass of kaolin was used instead of 70% by mass of cellulose powder.

[Evaluation of pseudo-adhesive labels]
The peel strength of each of the pseudo-adhesive labels produced in Examples 1 to 5 and Comparative Examples 1 to 3 was evaluated as follows. The evaluation results are shown in Table 2.

(Peeling force measurement)
The 180-degree peel adhesive strength was measured in accordance with JIS Z 0237:2000. Specifically, the prepared pseudo-adhesive label was first fixed to a stainless steel test plate using the adhesive layer of the pseudo-adhesive label itself. Then, the substrate of the pseudo-adhesive label was peeled from the first layer, which was the pseudo-adhesive layer, under the conditions of peel speeds of 0.3 m/min, 10 m/min, and 30 m/min and a peel angle of 180 degrees. The magnitude of the force (peel force) required for this peeling was measured, and the measured peel force was taken as the peel force (pseudo-adhesive force). The unit of the peel force (pseudo-adhesive force) is mN/25 mm.

As shown in Table 2, the pseudo-adhesive labels of Examples 1 to 5 had a smaller peel force as the peeling speed increased, making them easier to peel at higher speeds. From this, it can be considered that the pseudo-adhesive labels of Examples 1 to 5 are labels that can be easily peeled when intended while suppressing unintentional peeling of the substrate.
On the other hand, the pseudo-adhesive label of Comparative Example 1 had a smaller peel force as the peel speed decreased, and was a label that was more easily peeled at lower speeds. From this, it is thought that the pseudo-adhesive label of Comparative Example 1 may cause unintended peeling of the substrate.
Furthermore, although the pseudo-adhesive labels of Comparative Examples 2 and 3 were labels in which the peel force did not change much with the peel speed, the peel force of the pseudo-adhesive label of Comparative Example 2 was smaller at 0.3 m/min than at 30 m/min, and the peel force of the pseudo-adhesive label of Comparative Example 3 at 0.3 m/min was itself small, so it is thought that unintended peeling of the substrate occurred in both cases.

1...pseudo adhesive label, 10...substrate, 10A...first substrate surface, 10B...second substrate surface, 20...first layer, 30...second layer, 40...adhesive layer, 100...adherend, RL...release liner.

Claims (14)

A substrate;
The first layer and
The second layer and
and a pressure-sensitive adhesive layer in this order,
the first layer is a pseudo-adhesive layer containing a first aqueous resin, a metal soap, and a first paper powder;
the second layer contains a second aqueous resin,
Pseudo adhesive labels. the first aqueous resin is at least one selected from the group consisting of an ethylene-vinyl acetate copolymer resin, a polyurethane resin, a polyethylene resin, a polyvinyl alcohol resin, and a vinyl acetate resin;
The pseudo-adhesive label of claim 1 . The metal soap is a fatty acid metal salt.
The pseudo-adhesive label according to claim 1 or 2. The fatty acid metal salt is calcium stearate or zinc stearate.
The pseudo-adhesive label of claim 3 . The first paper powder is one or more selected from the group consisting of cellulose powder, pulp, and paper cutting waste.
The pseudo-adhesive label according to any one of claims 1 to 4. the second aqueous resin is at least one selected from the group consisting of an ethylene-vinyl acetate copolymer resin, a polyurethane resin, a polyethylene resin, a polyvinyl alcohol resin, and a vinyl acetate resin;
The pseudo-adhesive label according to any one of claims 1 to 5. a blending ratio of the first aqueous resin, the metal soap, and the first paper powder in the first layer is 0.5:1.5:8 to 3:3.5:3.5;
The pseudo-adhesive label according to any one of claims 1 to 6. the coating amount of the first layer is 4 g/ ^m2 or more and 8 g/ ^m2 or less;
The pseudo-adhesive label according to any one of claims 1 to 7. the coating amount of the second layer is 4 g/ ^m2 or more and 30 g/ ^m2 or less;
The pseudo-adhesive label according to any one of claims 1 to 8. The substrate is heat-sensitive paper or pressure-sensitive paper.
The pseudo-adhesive label according to any one of claims 1 to 9. the first layer is in direct contact with the substrate on one surface,
The first layer is in direct contact with the second layer on the other surface.
The pseudo-adhesive label according to any one of claims 1 to 10. The pseudo-adhesive label is such that the first layer undergoes cohesive failure when the substrate is peeled from the first layer.
The pseudo-adhesive label of claim 11. The pseudo-adhesive label has a peel strength of 1300 mN/25 mm or more when the substrate is peeled from the first layer at a peel speed of 0.3 m/min and a peel angle of 180 degrees, in accordance with JIS Z0237:2009, and a peel strength of 1500 mN/25 mm or less when the substrate is peeled from the first layer at a peel speed of 30 m/min and a peel angle of 180 degrees.
The pseudo-adhesive label according to claim 11 or 12. Further, it has a release liner,
The pressure-sensitive adhesive layer is attached to the release liner.
The pseudo-adhesive label according to any one of claims 1 to 13.