JP2023033800A - Pseudo adhesion label - Google Patents

Abstract

To provide a pseudo adhesion label that has unintended peeling optimally prevented in a surface of a pseudo adhesive layer even in a state with the pseudo adhesive label adhered to a curved or bended surface of an adherend.SOLUTION: A pseudo adhesion label of the present invention comprises: a base material; a pseudo adhesive layer that is provided on one surface side of the base material; and an adhesive layer that is provided adjacently on an opposite side of the base material of the pseudo adhesive layer, in which the pseudo adhesive layer contains copolymer of ethylene and other monomer, and the pseudo adhesion label is peeled at an interface between the base material and pseudo adhesive layer. It is preferable that the copolymer of the ethylene and other monomer is ethylene-vinyl acetate copolymer. It is preferable that a copolymerization ratio of the vinyl acetate in the ethylene-vinyl acetate copolymer is equal to or more than 3 mass% and equal to or less than 15 mass%.SELECTED DRAWING: Figure 3

Description

The present invention relates to pseudo-adhesive labels.

A pseudo-adhesive label is a label that can be easily peeled off from a substrate starting from the pseudo-adhesive interface after being attached to an adherend. Pseudo-adhesive labels have been put to practical use, for example, as delivery labels, information concealment labels, and the like.

2. Description of the Related Art In recent years, mail-order sales through the Internet and TV shopping have been widely used, and along with this, a distribution form in which a delivery company delivers products on behalf of a product seller has become common. In this type of distribution, a delivery company packs items (products) using packaging materials such as corrugated cardboard and paper boxes, and affixes a delivery label with information on the delivery destination to the surface of the packaging material. to deliver the shipment to its purchaser.

Such shipping labels are known, for example, as described in US Pat. This label comprises a first thermal base material, a resin layer as a pseudo-adhesive layer made of a hot-melt adhesive containing a thermoplastic resin and having pseudo-adhesiveness, a second thermal base material, an adhesive layer, and a peeling layer. The sheets are laminated in this order so that the resin layer and the second thermal substrate are quasi-bonded. Then, a receipt stamp field is written on the surface of the first thermal base material together with information about the delivery destination, and after receiving confirmation of receipt in the receipt stamp field at the delivery destination, the resin layer and the second thermal base material are placed. The laminate of the first thermal base material and the resin layer is separated at the interface with the material, and the separated laminate of the first thermal base material and the resin layer is collected and managed as proof of delivery completion.

Shipping labels used to be made of packing materials such as cardboard boxes and paper boxes, but recently, soft packing materials such as resin bags and paper bags are sometimes used in order to eliminate dead space during transportation. In the case of soft bags, if the bag is bent during shipping, the shipping label attached to the bag will also be bent.

In addition, the use of deformed boxes corresponding to the shape of the contents, for example, boxes having polygonal shapes such as triangles and trapezoids on one side, or boxes having irregularities or curved surfaces is increasing. Then, depending on the shape and size of the box, the shipping label may be affixed in a bent state not to the flat portion of the box but to two adjacent surfaces straddling the corner portions.

Thus, when the shipping label is in a bent state, stress is applied to the bent portion, and peeling of the surface of the pseudo-adhesive layer may occur during shipping.

JP 2015-179193 A

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pseudo-adhesive label that suitably prevents unintended peeling of the pseudo-adhesive layer on the surface of the pseudo-adhesive layer even when the label is attached to a curved or bent surface of an adherend. It is in.

Such objects are achieved by the present invention described in (1) to (9) below.
(1) a substrate;
A pseudo-adhesive layer provided on one surface side of the base material;
A pressure-sensitive adhesive layer provided adjacent to the side opposite to the base material of the pseudo-adhesive layer,
The pseudo-adhesive layer contains a copolymer of ethylene and other monomers,
A pseudo-adhesive label, wherein the pseudo-adhesive label is configured to be peeled off at an interface between the substrate and the pseudo-adhesive layer.

(2) The pseudo-adhesive label according to (1) above, wherein the pseudo-adhesive layer contains an ethylene-vinyl acetate copolymer.

(3) The pseudo-adhesive label according to (2) above, wherein the copolymerization ratio of vinyl acetate in the ethylene-vinyl acetate copolymer is 3% by mass or more and 15% by mass or less.

(4) The pseudo-adhesive label according to any one of (1) to (3) above, wherein the pseudo-adhesive layer has a thickness of 5.0 μm or more and 18.0 μm or less.

(5) Any one of the above (1) to (4), wherein the pseudo-adhesive layer has a Young's modulus of 20 MPa or more and 80 MPa or less, as measured by a method in accordance with JIS K7161-1:2014 and JIS K 7127:1999. Pseudo-adhesive label as described in .

(6) The pseudo adhesive layer is a rectangular sample piece with a width of 15 mm and a length of 200 mm. Then, the initial stress value measured by performing a tensile test with 5% elongation at a speed of 0.2 m / min was S1 [MPa], and the residual stress value after 5 minutes from the start of measurement was S2 [MPa]. when the following formula:
Stress relaxation rate (%) = {(S1-S2)/S1} x 100
The pseudo-adhesive label according to any one of the above (1) to (5), which has a stress relaxation rate of 12% or more.

(7) The pseudo-adhesive strength between the substrate and the pseudo-adhesive layer measured at a peel speed of 10 m/min in the 180° peel test specified in JIS Z 0237:2009 is 4000 mN/50 mm or more and 7000 mN/50 mm or less. A pseudo-adhesive label according to any one of (1) to (6) above.

(8) The pseudo-adhesive label according to any one of (1) to (7) above, wherein the pseudo-adhesive layer and the pressure-sensitive adhesive layer are substantially transparent.

(9) The pseudo-adhesive label according to any one of (1) to (8) above, which is used as a shipping label.

According to the present invention, there is provided a pseudo-adhesive label that suitably prevents unintended peeling on the surface of the pseudo-adhesive layer even when it is adhered to a curved or bent surface of an adherend. can be done.

1 is a cross-sectional view showing a preferred embodiment of the pseudo-adhesive label of the present invention; FIG. 1 is a perspective view showing a state in which the pseudo-adhesive label of the present invention is attached to a corrugated cardboard box as an adherend. FIG. FIG. 2 is a cross-sectional view showing a state in which the pseudo-adhesive label of the present invention is attached to a corrugated cardboard box as an adherend. FIG. 4 is a cross-sectional view showing a state in which the substrate is peeled off from the pseudo-adhesive label of the present invention; FIG. 3 is a cross-sectional view showing a state in which a pseudo-adhesive label of a comparative example is attached to a corrugated cardboard box as an adherend.

Preferred embodiments of the present invention are described in detail below.
[1] Pseudo-Adhesive Label FIG. 1 is a sectional view showing a preferred embodiment of the pseudo-adhesive label of the present invention.

The pseudo-adhesive label 1 of this embodiment includes a substrate 10, a pseudo-adhesive layer 20 provided on one side of the substrate 10, and the pseudo-adhesive layer 20 adjacent to the side opposite to the substrate 10. and a provided adhesive layer 30, the pseudo-adhesive layer 20 contains a copolymer of ethylene and other monomers, and is peeled off at the interface A between the base material 10 and the pseudo-adhesive layer 20 is configured as

In this specification, the term “pseudo-adhesion” refers to the interface between one layer and the other layer that are laminated under specific conditions (for example, a combination of materials and a temperature range). However, it refers to adhesion in a form that does not exhibit re-adhesiveness or re-adhesiveness after peeling.

In the case of the pseudo-adhesive label 1 according to the present embodiment, it can be peeled off at the interface A between the substrate 10 as one layer and the pseudo-adhesive layer 20 as the other layer. The surface on the interface A side and the surface on the interface A side of the pseudo-adhesive layer 20 do not exhibit readhesion or readhesion.

In the pseudo-adhesive label 1 of the present embodiment, since the pseudo-adhesive layer 20 contains a copolymer of ethylene and other monomers, the pseudo-adhesive layer 20 maintains sufficient pseudo-adhesive strength. A low Young's modulus and high stress relaxation can be imparted. As a result, when the pseudo-adhesive label 1 is attached as the adherend 100 in a bent state to the corner of a box, an uneven surface, a curved surface, or the like, or the pseudo-adhesive label 1 is attached to a soft bag and bent. Even if the base material 10 is peeled off unintentionally from the pseudo-adhesive layer 20, it can be prevented. Thereby, during use (for example, during shipping when the pseudo-adhesive label 1 is applied as a shipping label), at the surface of the pseudo-adhesive layer 20, that is, at the interface between the substrate 10 and the pseudo-adhesive layer 20 It is possible to provide the pseudo-adhesive label 1 that suitably prevents unintended peeling of the adhesive.

Moreover, in the pseudo-adhesive label 1, the base material 10 can be suitably peeled off from the pseudo-adhesive layer 20 when necessary, for example, after delivery.

It is believed that such excellent effects are obtained because the pseudo-adhesive layer 20 contains a copolymer of ethylene and other monomers.

On the other hand, satisfactory results cannot be obtained if the above conditions are not satisfied.
For example, if the pseudo-adhesive layer 20 included in the pseudo-adhesive label 1 does not contain a copolymer of ethylene and other monomers, the pseudo-adhesive layer 20 has a low Young's modulus and high stress relaxation properties. I can't. As a result, unintentional peeling of the base material 10 from the pseudo-adhesive layer 20 cannot be sufficiently prevented.

In the following description, the case where the pseudo-adhesive label 1 of the present embodiment is used as a shipping label will be mainly described, but the usage of the pseudo-adhesive label 1 of the present embodiment is not limited to this. do not have.

[1-1] Substrate The substrate 10 is not particularly limited, and is appropriately selected from substrates used in conventional pseudo-adhesive labels according to the application of the pseudo-adhesive label 1 .

Examples of the substrate 10 include paper, resin film, synthetic paper, and the like. Also, the base material 10 may be a laminate sheet or the like in which two or more layers of these are laminated.

Examples of paper that can be used as the base material 10 include thermal paper, kraft paper, fine paper, glassine paper, parchment paper, rayon paper, and coated 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.

The substrate 10 is preferably paper, more preferably thermal paper, kraft paper, fine paper, or glassine paper.

It is preferable that the surface of the substrate 10, which is the surface of the pseudo-adhesive label 1, in other words, the surface opposite to the side on which the pseudo-adhesive layer 20 is provided, is capable of writing various information for identification.

In the pseudo-adhesive label 1, the substrate 10 is, for example, an information display substrate that displays information about the adherend 100. FIG. For example, when the adherend 100 is a delivery item and the pseudo-adhesive label 1 is used as a delivery label, the information on the adherend 100 includes the sender, the destination, and the name and address of the delivery company, Phone number, contents of delivery items, etc. can be mentioned.

These pieces of information are displayed including, for example, characters, symbols, graphics, or any combination thereof. It also includes display by two-dimensional codes such as bar codes and QR codes (registered trademark).
These pieces of information are printed by, for example, a thermal printer or the like.

When the base material 10 is thermal paper, the base material 10 has a thermosensitive coloring layer (not shown) on the side opposite to the side on which the pseudo adhesive layer 20 is provided. As a result, the surface of the base material 10 can be printed by a thermal printer or the like.

Examples of the thermosensitive coloring layer include those containing a leuco dye and a developer that reacts with the leuco dye.

The thermosensitive coloring layer is formed by applying a coating liquid containing, for example, the above-mentioned leuco dye and color developer as well as a binder, wax, solvent, etc. It is preferably formed by coating on the opposite side.

The thickness of the base material 10 is not particularly limited, but is preferably 10.0 μm or more and 200.0 μm or less, more preferably 20.0 μm or more and 150.0 μm or less, and 30.0 μm or more and 100.0 μm or less. is more preferable.

As a result, when the pseudo adhesive label 1 is attached to the adherend 100, when the substrate 10 is peeled off from the pseudo adhesive layer 20, and when the substrate 10 is peeled off, the handleability of the peeled substrate 10 is improved.

In the following description, the composition for forming the pseudo-adhesive layer 20 is also referred to as "the composition for forming the pseudo-adhesive layer".

Since the pseudo-adhesive label 1 of the present embodiment has only one base material 10, the material cost can be reduced compared to a pseudo-adhesive label having a plurality of base materials.

In addition, since the base material 10 is one, for example, the process of applying the pseudo-adhesive layer forming composition onto the base material 10 is only one, so that the number of manufacturing processes can be reduced. Manufacturing costs can also be reduced.

Furthermore, since the base material 10 is one sheet, the thickness of the entire label can be reduced, and space can be saved when a plurality of pseudo-adhesive labels 1 are stored in a laminated state.

[1-2] Pseudo-adhesive layer The pseudo-adhesive layer 20 is laminated so as to be pseudo-adhered to the substrate 10, and the interface A between the pseudo-adhesive layer 20 and the substrate 10 is , When necessary, it adheres with a peeling force to the extent that it can be easily peeled off.

The pseudo-adhesive layer 20 contains a copolymer of ethylene and other monomers as a thermoplastic resin that does not have tackiness at room temperature.

Conventionally, polyethylene resins have often been selected as the thermoplastic resins constituting the pseudo-adhesive layer from the viewpoints of ease of processing and availability.

By copolymerizing ethylene with other monomers (monomers other than ethylene), the crystallinity is lowered and the flexibility of the resin can be increased as compared with polyethylene resin, which is a polymer of ethylene alone.

That is, by using a copolymer of ethylene and other monomers as the thermoplastic resin constituting the pseudo-adhesive layer 20, the pseudo-adhesive layer 20 has a low Young's modulus while exhibiting appropriate pseudo-adhesiveness. High stress relaxation can be imparted.

In addition, by using a copolymer of ethylene and other monomers in the pseudo-adhesive layer 20, when the base material 10 is a paper base material, better pseudo-adhesiveness is realized with the paper base material. can do.

Examples of copolymers of ethylene and other monomers constituting the pseudo-adhesive layer 20 include ethylene-vinyl acetate copolymers, ethylene-acrylate copolymers, ethylene-butene copolymers, and ethylene-octene. Examples thereof include copolymers, and one or a combination of two or more selected from these can be used, but an ethylene-vinyl acetate copolymer is preferred.
Thereby, the effect mentioned above is exhibited more notably.

When the pseudo-adhesive layer 20 contains an ethylene-vinyl acetate copolymer as a copolymer of ethylene and other monomers, the entire copolymer of ethylene and other monomers constituting the pseudo-adhesive layer 20 The ethylene-vinyl acetate copolymer accounts for preferably 50% by mass or more, more preferably 70% by mass or more, and even more preferably 90% by mass or more.

The following description will focus on the case where the copolymer of ethylene and other monomers is an ethylene-vinyl acetate copolymer (that is, a copolymer of ethylene and vinyl acetate).

The copolymerization ratio of vinyl acetate in the ethylene-vinyl acetate copolymer, that is, the ratio of vinyl acetate as a monomer in all constituent monomers constituting the ethylene-vinyl acetate copolymer is 3% by mass or more and 15% by mass. is preferably 4% by mass or more and 12% by mass or less, and even more preferably 5% by mass or more and 9% by mass or less.

As a result, while maintaining a suitable pseudo-adhesive force, the pseudo-adhesive layer 20 can be given more suitable flexibility, and the effects of the present invention as described above can be made more remarkable. Even when 10 is peeled off at high speed, tearing and curling of the label are more effectively prevented.

The copolymerization form of ethylene and vinyl acetate in the ethylene-vinyl acetate copolymer is not particularly limited. , graft copolymers, etc. Among these, random copolymers are preferred.

As a result, the ethylene-vinyl acetate copolymer can be imparted with more suitable flexibility, and the effects of the present invention described above can be made more remarkable.

The softening point of the ethylene-vinyl acetate copolymer is preferably 50°C or higher and 100°C or lower, more preferably 70°C or higher and lower than 90°C.

As a result, the quasi-adhesive label 1 does not have tackiness at room temperature, and the quasi-adhesive label 1 has better heat resistance. For example, the quasi-adhesive layer 20 is prevented from softening even when the temperature rises in summer. , the adhesion stability is improved. In addition, the coating temperature can be lowered when the composition for forming a pseudo-adhesive layer is applied onto the base material 10. For example, even when thermal paper is used as the base material 10, It is possible to more reliably prevent the heat-sensitive paper from developing color due to the heat.

The softening point can be adjusted, for example, by appropriately selecting the copolymerization ratio of vinyl acetate in the ethylene-vinyl acetate copolymer, the molecular weight and molecular weight distribution, the ratio of the low molecular weight component to the high molecular weight component, and the like.

As described above, the pseudo-adhesive layer 20 has pseudo-adhesiveness to the base material 10, and the peeling force between the pseudo-adhesive layer 20 and the base material 10 is such that it can be easily peeled off. is in close contact with

The pseudo-adhesive strength between the substrate 10 and the pseudo-adhesive layer 20 measured at a peel rate of 0.3 m/min in the 180° peel test specified in JIS Z 0237:2009 is 200 mN/50 mm or more and 900 mN/50 mm or less. more preferably 250 mN/50 mm or more and 850 mN/50 mm or less, and even more preferably 300 mN/50 mm or more and 800 mN/50 mm or less.

As a result, it is possible to more reliably prevent the base material 10 from unintentionally peeling off the pseudo-adhesive layer 20, and for example, when the base material 10 is manually removed from the pseudo-adhesive layer 20 when necessary, In addition, it is possible to peel off the substrate 10 more smoothly while preventing breakage of the substrate 10 with a relatively low peeling resistance.

In addition, in the peel test, that is, the 180 ° peel test specified in JIS Z 0237: 2009, the pseudo adhesive force between the substrate 10 and the pseudo adhesive layer 20 measured when the peel speed is 10 m / min is preferably 4000 mN/50 mm or more and 9500 mN/50 mm or less, more preferably 4000 mN/50 mm or more and 8000 mN/50 mm or less, and even more preferably 4000 mN/50 mm or more and 7000 mN/50 mm or less.

Thereby, the same effect as described above can be obtained. In addition, when peeling the base material 10 from the pseudo-adhesive layer 20, curling of the base material 10 is more effectively prevented even when the base material 10 is peeled at a high speed, and when the peeled base material 10 is stored. The handleability of is improved.

Furthermore, by preventing the peeled base material 10 from curling, information recorded on the peeled base material 10 can be preferably read. In addition, when the peeled base material 10 is superimposed and stored as a delivery slip or the like, it can be effectively prevented from being bulky, which can contribute to space saving of the storage place.

As described above, the pseudo-adhesive layer 20 has a pseudo-adhesive force that allows it to be peeled off at the interface A with the substrate 10 when necessary. At the interface B between the pseudo-adhesive layer 20 and the substrate 10, the adhesion is stronger than the peel force at the interface A. Therefore, in a state where the pseudo adhesive label 1 from which the release liner 40 has been peeled off is attached to the adherend 100 by the adhesive layer 30, when the substrate 10 side is manually peeled off, the substrate 10 is removed from the pseudo adhesive layer. 20 will be peeled off.

The pseudo-adhesive layer 20 preferably has a Young's modulus of 20 MPa or more and 80 MPa or less, more preferably 30 MPa or more and 70 MPa or less, and even more preferably 40 MPa or more and 60 MPa or less.

As a result, the pseudo-adhesive layer 20 has appropriate flexibility, and for example, when the pseudo-adhesive label 1 is folded, the stress applied to the folded portion can be more preferably relieved. is prevented from being unintentionally peeled off from the pseudo-adhesive layer 20 more reliably.

As used herein, the term "Young's modulus" refers to a value measured according to the "tensile modulus" described in JIS K7161-1:2014 and JIS K7127:1999.

The pseudo adhesive layer 20 is a rectangular sample piece with a width of 15 mm and a length of 200 mm. When the initial stress value measured by performing a tensile test with 5% elongation at a speed of 2 m / min is S1 [MPa], and the residual stress value 5 minutes after the start of measurement is S2 [MPa], the following The stress relaxation rate represented by the formula is preferably 12% or more, more preferably 15% or more.
Stress relaxation rate (%) = {(S1-S2)/S1} x 100

As a result, for example, when the pseudo-adhesive label 1 is folded, the stress applied to the folded portion can be more preferably relieved, and the unintentional peeling of the substrate 10 from the pseudo-adhesive layer 20 can be further prevented. can be reliably prevented.

The melt mass flow rate (MFR) of the copolymer of ethylene and other monomer is preferably 3 g/10 min or more and 35 g/10 min or less, more preferably 5 g/10 min or more and 30 g/10 min or less. It is preferably 7 g/10 minutes or more and 25 g/10 minutes or less, more preferably.

As used herein, the melt mass flow rate refers to a value measured by the method specified in JIS K7210-1:2014.

As a result, when the composition for forming a pseudo-adhesive layer is applied onto the substrate 10, the suitable fluidity of the composition for forming a pseudo-adhesive layer can be maintained. can be made more excellent, and the pseudo-adhesive layer 20 can be more suitably formed on the substrate 10 by the melt extrusion method. Furthermore, even when the pseudo adhesive label 1 is stored in a hot and humid environment, the peel strength of the pseudo adhesive layer 20 is less likely to change, further improving the stability of the peel performance.

The pseudo-adhesive layer 20 may be composed of a material containing a copolymer of ethylene and other monomers, and may contain components other than the copolymer of ethylene and other monomers. , The content of the copolymer of ethylene and other monomers in the pseudo-adhesive layer 20 is preferably 80% by mass or more, more preferably 85% by mass or more, and 90% by mass or more. is more preferred.
Thereby, the effect of the present invention described above can be exhibited more remarkably.

In addition to the copolymer of ethylene and other monomers, the pseudo-adhesive layer 20 may contain, for example, a thermoplastic resin other than the copolymer of ethylene and other monomers. Examples of the thermoplastic resin include other polyolefin-based resins, polyvinyl acetate, polyester-based resins, polyamide-based resins, and the like.

Examples of polyolefin resins include polyethylene resin, polypropylene resin (PP), polybutene resin (PB), ethylene-propylene copolymer, olefin elastomer (TPO), ethylene-methyl methacrylate copolymer (EMMA), ethylene -Olefin-based terpolymers such as propylene-(5-ethylidene-2-norbornene).

When the pseudo-adhesive layer 20 contains a thermoplastic resin other than the copolymer of ethylene and other monomers in addition to the copolymer of ethylene and other monomers, the content of the thermoplastic resin is preferably 0.1 parts by mass or more and 15.0 parts by mass or less, and 0.5 parts by mass or more and 10.0 parts by mass or less with respect to 100 parts by mass of the copolymer of ethylene and other monomers. more preferably 1.0 parts by mass or more and 5.0 parts by mass or less.

In addition, the pseudo-adhesive layer 20 may contain components other than those described above (hereinafter also referred to as "other components" in this item). Other components include, for example, antioxidants, ultraviolet absorbers, light stabilizers, softening agents, flame retardants, antistatic agents, lubricants, fillers, colorants, etc., and 1 selected from these A species or a combination of two or more species can be used.

However, the content of other components in the pseudo-adhesive layer 20 is preferably 20.0% by mass or less, more preferably 15.0% by mass or less, and 10.0% by mass or less. is more preferred.

Although the thickness of the pseudo adhesive layer 20 is not particularly limited, it is preferably 5.0 μm or more and 18.0 μm or less, more preferably 7.0 μm or more and 16.0 μm or less, and 10.0 μm or more and 15.0 μm or less. It is more preferably 0 μm or less.

As a result, sufficient pseudo-adhesive force to the base material 10 can be ensured, and unintentional peeling of the base material 10 from the pseudo-adhesive layer 20 can be more reliably prevented. In addition, it is possible to prevent the substrate 10 from tearing or curling into a cylindrical shape during high-speed peeling. Further, the substrate 10 is peeled off from the pseudo adhesive label 1 attached to the adherend 100, and the pseudo adhesive layer 20 remains on the adherend 100 together with the adhesive layer 30. It is possible to make the laminate having the pressure-sensitive adhesive layer 30 less conspicuous on the adherend 100 .

[1-3] Adhesive layer The adhesive layer 30 is a layer for attaching the pseudo adhesive label 1 to the adherend 100 .

While having an appropriate adhesive strength to the adherend 100, for example, in a state where the pseudo adhesive label 1 is attached to the adherend 100, when the substrate 10 is peeled off at the interface A with the pseudo adhesive layer 20, the interface In B, an adhesive having a strength capable of reliably holding the pseudo-adhesive layer 20 on the adherend 100 side is used.

Examples of the adhesive constituting the adhesive layer 30 include adhesives such as acrylic adhesives, natural rubber adhesives, synthetic rubber adhesives, and silicone adhesives, and one type selected from these adhesives. Alternatively, two or more kinds can be used in combination. Among them, acrylic pressure-sensitive adhesives and synthetic rubber-based pressure-sensitive adhesives are preferable from the viewpoints of ease of control of adhesive force and cost. Examples of acrylic pressure-sensitive adhesives include solvent-type acrylic pressure-sensitive adhesives, water-based emulsion-type acrylic pressure-sensitive adhesives, hot-melt-type acrylic pressure-sensitive adhesives, and the like. Synthetic rubber adhesives include solvent-based synthetic rubber adhesives, water-based emulsion synthetic rubber adhesives, hot-melt synthetic rubber adhesives, and the like.

The pressure-sensitive adhesive layer 30 may contain components other than those described above (hereinafter also referred to as “other components” in this item). Other components include, for example, fillers, softeners, heat and light stabilizers, antioxidants, cross-linking agents, and the like, and one or more selected from these can be used in combination.

Examples of fillers include zinc white, titanium oxide, silica, calcium carbonate, barium sulfate and the like.
Softening agents include, for example, process oils, liquid rubbers, plasticizers, and the like.

Examples of heat-light stabilizers include benzophenone-based stabilizers, benzotriazole-based stabilizers, hindered amine-based stabilizers, and the like.

Examples of antioxidants include anilide antioxidants, phenol antioxidants, phosphite antioxidants, thioester antioxidants, and the like.

Although the thickness of the adhesive layer 30 is not particularly limited, it is preferably 1.0 μm or more and 50.0 μm or less, more preferably 5.0 μm or more and 45.0 μm or less, and 10.0 μm or more and 40.0 μm or less. More preferably:

As a result, sufficient adhesive strength to the adherend 100 can be ensured, and handleability when the pseudo adhesive label 1 is attached to the adherend 100 can be made more suitable. Further, the substrate 10 is peeled off from the pseudo adhesive label 1 attached to the adherend 100, and the pseudo adhesive layer 20 remains on the adherend 100 together with the adhesive layer 30. It is possible to make the laminate having the pressure-sensitive adhesive layer 30 less conspicuous on the adherend 100 .

In the pseudo-adhesive label 1 of this embodiment, the pseudo-adhesive layer 20 and pressure-sensitive adhesive layer 30 are preferably substantially transparent.

This provides the following effects. For example, when the pseudo-adhesive label 1 is used as a delivery label, there is an order cancellation, delivery address information is printed incorrectly, etc., the delivery label once attached to the packaging material is peeled off, and a new delivery label with correct information is printed. It may be re-attached. In such a case, if at least one of the pseudo-adhesive layer 20 and the pressure-sensitive adhesive layer 30 is colored, the remaining pseudo-adhesive label 1, that is, the laminate having the pseudo-adhesive layer 20 and the pressure-sensitive adhesive layer 30 The presence of the body becomes conspicuous. Therefore, it is necessary to discard the adherend such as a box or bag to which the pseudo-adhesive label 1 is attached, and repackage the contents with a new adherend. On the other hand, if the pseudo-adhesive layer 20 and the pressure-sensitive adhesive layer 30 are substantially transparent, the information-recorded base material 10 remains on the adherend after being peeled and removed from the adherend. The pseudo-adhesive label 1, ie the laminate with the pseudo-adhesive layer 20 and the pressure-sensitive adhesive layer 30, is inconspicuous. Therefore, even if the laminate having the pseudo-adhesive layer 20 and the pressure-sensitive adhesive layer 30 remains on the adherend, the pseudo-adhesive label 1 on which correct information is described can be adhered. can be suitably reused without discarding an adherend such as a box or bag to which is attached.

In this specification, the term “substantially transparent” means that the pseudo-adhesive layer 20 and the pressure-sensitive adhesive layer 30 are attached to the surface of the adherend 100 by transmitting most of the visible light. It is sufficient that the surface of the adherend 100 is transparent enough to be directly visible through the pseudo-adhesive layer 20 and the pressure-sensitive adhesive layer 30, and the concept includes translucency.

The visible light transmittance of the laminate of the pseudo-adhesive layer 20 and the pressure-sensitive adhesive layer 30 is preferably 80% or more, more preferably 90% or more.
Thereby, the effect mentioned above is exhibited more notably.

[1-4] Release Liner In the pseudo-adhesive label 1 shown in FIG. 1, a release liner 40 is provided on the side of the pressure-sensitive adhesive layer 30 opposite to the side on which the pseudo-adhesive layer 20 is provided.

The release liner 40 has a function of protecting the pressure-sensitive adhesive layer 30 during transportation and storage of the pseudo-adhesive label 1 . When the pseudo-adhesive label 1 is attached to the adherend 100, the release liner 40 is separated from the pressure-sensitive adhesive layer 30 at the interface C. As shown in FIG.
It should be noted that the pseudo-adhesive label of the present invention is not limited to having a release liner.

The release liner 40 is not particularly limited, and a known release liner 40 can be appropriately selected and used. In general, the release liner 40 includes a base material (release base material) having one or both sides subjected to a release treatment.

Examples of the release base material that can be used for the release liner 40 include polyester films such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate; polyolefin films such as polyethylene, polypropylene and polymethylpentene; clay coated paper and glassine paper. , paper substrates such as recycled paper, and sheets such as laminated paper obtained by laminating a thermoplastic resin such as polyethylene on these paper substrates. Among these, paper substrates are particularly preferred.

Also, the release treatment agent for performing the release treatment is not particularly limited, and a known release treatment agent can be used. Specifically, silicone-based resins, olefin-based resins, isoprene-based resins, butadiene-based resins, long-chain alkyl-based resins, and alkyd-based resins are preferred, and butadiene-based resins and alkyd-based resins are more preferred.

The thickness of the release liner 40 is not particularly limited. More preferably, the thickness is 0 μm or more and 150.0 μm or less.

[2] Manufacturing Method of Pseudo-Adhesive Label A method of manufacturing a pseudo-adhesive label will be described below.

The pseudo-adhesive label 1 of the present embodiment includes, for example, a pseudo-adhesive layer forming step of forming a pseudo-adhesive layer 20 on one side of the substrate 10, and a pressure-sensitive adhesive layer on one side of the release liner 40. A pressure-sensitive adhesive layer forming step for forming a layer 30, a substrate 10 laminated with a pseudo-adhesive layer 20, and a release liner 40 laminated with a pressure-sensitive adhesive layer 30 are combined into a pseudo-adhesive layer 20 and a pressure-sensitive adhesive layer 30. It can be manufactured by a method comprising a lamination step of laminating so as to be in contact with each other.

Each step will be described below.
[2-1] Pseudo-Adhesive Layer Forming Step In this step, the pseudo-adhesive layer 20 is laminated on one surface of the substrate 10 .

A method for laminating the pseudo-adhesive layer 20 on the substrate 10 is not particularly limited. The method for manufacturing the pseudo-adhesive label 1 according to the present embodiment includes a melt-extrusion step of melt-extruding the pseudo-adhesive layer-forming composition containing the material constituting the pseudo-adhesive layer 20 onto the substrate 10 .

Examples of the method of melt-extruding the composition for forming a pseudo-adhesive layer include a method using a T-die.

The melt extrusion temperature is preferably 180°C or higher and 400°C or lower, more preferably 200°C or higher and 350°C or lower, and even more preferably 230°C or higher and 300°C or lower.

The quasi-adhesive layer forming step also includes a cooling step of cooling the melt-extruded quasi-adhesive layer forming composition.

The cooling step can be carried out, for example, by bringing the heat-melted composition for forming a pseudo-adhesive layer into contact with cooling means such as a cooling roll. As the cooling roll, for example, a roll having a cylindrical body whose outer peripheral surface is made of metal can be used. The cooling roll may have a cooling function by allowing cooling water or the like to pass through the inside of the cylinder. When a cooling roll is used as the cooling means, the composition for forming a pseudo-adhesive layer melt-extruded onto the base material 10 may be cooled by directly contacting the outer peripheral surface of the cooling roll, or the base material 10 may be cooled. The pseudo-adhesive layer-forming composition may be indirectly cooled by direct contact with the outer peripheral surface of the cooling roll. In the cooling step, the melt-extruded composition for forming a pseudo-adhesive layer may be cooled by air cooling.

[2-2] Adhesive Layer Forming Step In this step, an adhesive layer containing a material constituting the adhesive layer 30 is formed on one surface of the release liner 40, specifically, on the surface subjected to the release treatment. The adhesive layer 30 is formed by applying the forming composition.

Examples of the method of applying the pressure-sensitive adhesive layer-forming composition include roll coating, spray coating, bar coating, knife coating, roll knife coating, blade coating, die coating and gravure coating. mentioned.

[2-3] Lamination step In this step, the substrate 10 laminated with the pseudo-adhesive layer 20 and the release liner 40 laminated with the pressure-sensitive adhesive layer 30 are separated into the pseudo-adhesive layer 20 and the pressure-sensitive adhesive layer 30. are in contact with each other.
Through the above steps, the pseudo-adhesive label 1 as shown in FIG. 1 is manufactured.

Note that the method for manufacturing the pseudo-adhesive label is not limited to the example described above.
For example, a composition for forming an adhesive layer is applied to the surface of the pseudo-adhesive layer 20 laminated on the substrate 10 to laminate the adhesive layer 30, and a release liner 40 is further applied to the surface of the adhesive layer 30. The pseudo-adhesive label 1 can also be preferably manufactured by the method of attaching the .

[3] Method of Using Pseudo-Adhesive Label Next, a method of using the pseudo-adhesive label will be described.

FIG. 2 is a perspective view showing a state in which the pseudo-adhesive label of the present invention is attached to a corrugated cardboard box as an adherend. FIG. 3 is a cross-sectional view showing a state in which the pseudo-adhesive label of the present invention is attached to a corrugated cardboard box as an adherend. FIG. 4 is a cross-sectional view showing a state in which the substrate has been peeled off from the pseudo-adhesive label of the present invention. 3 and 4 show enlarged portions of the pseudo-adhesive label.

The pseudo-adhesive label 1 of this embodiment is used, for example, as a shipping label.
That is, the pseudo-adhesive label 1 is adhered to a delivery item via the adhesive layer 30 after the release liner 40 is peeled off, and the base material 10 is used as a receipt slip.

The pseudo-adhesive label 1 according to this embodiment can be peeled off at the interface C between the adhesive layer 30 and the release liner 40 . As shown in FIG. 2, the pseudo-adhesive label 1 is attached to the adherend 100 with the pressure-sensitive adhesive layer 30 after peeling off the release liner 40 .

When the pseudo-adhesive label 1 is used as a shipping label, the adherend 100 is, for example, a shipping item. An item to be delivered is usually composed of an item to be delivered and a packing material for packing the item. Examples of packing materials include packing paper, packing films, packing bags, packing boxes, and packing containers. Materials for the packing material include cardboard, paper, plastic, metal, and the like. The pseudo-adhesive label 1 is usually attached to the packing material of the delivery item.

In the examples shown in FIGS. 2 to 4, the adherend 100 is attached to a corrugated cardboard box. The examples shown in FIGS. 2 to 4 show the case where the pseudo-adhesive label 1 is attached across the corners of the corrugated cardboard box.

In particular, the pseudo-adhesive label 1 of the present embodiment is attached across the corners of the cardboard box, that is, when it is attached in a bent state, or when it is attached to a soft resin bag and is attached to the bag during delivery. Since the pseudo-adhesive layer 20 comprises a copolymer of ethylene and other monomers, the pseudo-adhesive layer 20 is flexible and bendable even when it is bent together. The stress applied to the exposed portion is preferably relaxed.

This can prevent the substrate 10 from unintentionally peeling off the pseudo-adhesive layer 20 during delivery.

When the delivery is completed, the substrate 10 is peeled off from the pseudo-adhesive layer 20 at the interface A as shown in FIG. 4 after stamping or signing, and is used as a receipt to be brought back to the delivery company.

In the pseudo-adhesive label 1 of the present embodiment, since the pseudo-adhesive layer 20 does not remain on the substrate 10 side after peeling, compared to the conventional pseudo-adhesive label in which the pseudo-adhesive layer is peeled off together with the substrate, The thickness of the label piece after peeling can be reduced. As a result, when the base material 10 after peeling is stored as, for example, a receipt slip, the thickness of a plurality of receipt slips can be thinned and space can be saved. Connect.

In addition, since the label piece after peeling has only the base material 10 and does not have the pseudo-adhesive layer 20, even if it is placed in a high-temperature environment, the label piece after peeling is Stickiness is also prevented.

Also, when the base material 10 after peeling is discarded as waste, the thin thickness can reduce the amount of waste.

When the pseudo-adhesive label 1 is used as a delivery label, the substrate 10 of the pseudo-adhesive label 1 may be divided into a plurality of label pieces by notches (half-cut lines), for example. For example, if the substrate 10 is split in two by a cut, one label strip can be used as a delivery note and the other label strip can be used as a receipt note. A label piece as a receipt slip is usually peeled off at the interface A with the pseudo-adhesive layer 20 after being stamped or signed. The other label piece remains on the packaging material side.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these.

For example, the pseudo-adhesive label of the present invention may have layers other than the layers described above, such as an undercoat layer, an intermediate layer, and a surface protective layer.

Further, in the above-described embodiment, the pseudo-adhesive label of the present invention is used as a delivery label, but the pseudo-adhesive label of the present invention can also be used as a label other than a delivery label, for example. .

EXAMPLES The present invention will be described in more detail below with reference to Examples, but the present invention is not limited to these Examples.

In the following description, treatments for which temperature conditions are not indicated were performed at room temperature (23° C.) and relative humidity of 50%. In addition, for various measurement conditions, those without specific temperature conditions are values at room temperature (23° C.) and relative humidity of 50%.

[4] Production of pseudo-adhesive label (Example 1)
First, thermal paper (thickness: 74 μm, basis weight: 80 g/m ² ) was prepared as a base material.

An ethylene-vinyl acetate copolymer (EVA) as a composition for forming a pseudo-adhesive layer was heated to 250° C. and extruded onto one surface of the substrate using a T-die.

Cooling water adjusted to a water temperature of 23° C. is passed through the water-cooled roll, and the surface of the water-cooled roll is brought into contact with the EVA on the base material, thereby cooling and solidifying the molten EVA, and forming the base material. A pseudo-adhesive layer with a thickness of 12.0 μm was formed thereon.

The ethylene-vinyl acetate copolymer used had a copolymerization ratio of vinyl acetate of 6% by mass, a softening point of 75° C., and an MFR of 8.5 g/10 minutes.

In addition, the conveying speed of the substrate when forming the pseudo adhesive layer, that is, the processing speed of the pseudo adhesive layer was set to 150 m/min.

On the other hand, a pressure-sensitive adhesive layer-forming composition comprising an acrylic pressure-sensitive adhesive was applied to the surface of glassine paper (release liner) that had been subjected to release treatment using a roll coater. Thereafter, the applied composition was dried to form a pressure-sensitive adhesive layer on the release liner.

Laminating the substrate laminated with the pseudo-adhesive layer and the release liner laminated with the pressure-sensitive adhesive layer so that the pseudo-adhesive layer and the pressure-sensitive adhesive layer are in contact with each other. A pseudo-adhesive label was obtained. The resulting pseudo-adhesive label comprised a substrate, a pseudo-adhesive layer, a pressure-sensitive adhesive layer, and a release liner in this order.

(Examples 2-4)
A pseudo-adhesive label was produced in the same manner as in Example 1 except that the thickness of the pseudo-adhesive layer was changed as shown in Table 1.

(Examples 5-8)
A pseudo-adhesive label was produced in the same manner as in Example 1 except that the conditions of the ethylene-vinyl acetate copolymer constituting the pseudo-adhesive layer were changed as shown in Tables 1 and 2.

(Comparative example 1)
A pseudo-adhesive layer was prepared in the same manner as in Example 1 except that polyethylene (PE) was used instead of ethylene-vinyl acetate copolymer as the material for the pseudo-adhesive layer, and the thickness of the pseudo-adhesive layer was 20.0 μm. An adhesive label was produced.

(Comparative example 2)
A pseudo-adhesive label was produced in the same manner as in Comparative Example 1 except that the thickness of the pseudo-adhesive layer was 12.0 μm.

[5] Measurement/Evaluation The following measurements/evaluations were performed for each example and each comparative example.

(Melt mass flow rate)
The pseudo-adhesive layer-forming composition used for forming the pseudo-adhesive layer of the pseudo-adhesive label of each of the examples and comparative examples was tested according to JIS K 7210-1: 2014 at a test temperature of 190 ° C. and a load of 2. Melt mass flow rate (MFR) was measured at .16 Kg.

(Young's modulus)
The pseudo-adhesive layer-forming composition used for forming the pseudo-adhesive layer of the pseudo-adhesive labels of the above Examples and Comparative Examples was applied onto the release-treated surface of the release liner. After extruding to the same thickness and cooling, the release liner was removed to obtain a sheet composed of the composition for forming a pseudo-adhesive layer. A test piece was obtained by cutting the sheet into a rectangle having a width of 15 mm and a length of 200 mm. Using these test pieces, Young's modulus at 23° C. and 50% RH was measured according to JIS K7161-1:2014 and JIS K7127:1999. Specifically, the above test piece was subjected to a tensile test at a speed of 0.2 m/min after setting the distance between chucks to 100 mm using a tensile tester, and Young's modulus (unit: MPa) was measured.

(Stress relaxation)
A test piece was obtained in the same manner as the test piece for Young's modulus measurement. Using these test pieces, set the distance between chucks to 100 mm in a tensile tester under an environment of 23 ° C. and 50% RH, then stretch 5% at a tensile speed of 0.2 m / min, and the initial stress value ( S1) and the residual stress value (S2) 5 minutes after the start of measurement were measured. Then, from those values, the stress relaxation rate (%) represented by the following formula was calculated.
Stress relaxation rate (%) = {(S1-S2)/S1} x 100

(Pseudo adhesive strength)
For the pseudo-adhesive labels of each of the examples and comparative examples, the pseudo-adhesive force was measured according to JIS Z 0237:2009 180° peel adhesive force measurement. More specifically, first, the release liner was removed from the pseudo-adhesive label, and the exposed pressure-sensitive adhesive layer was adhered to a stainless steel plate for fixing. After that, the substrate of the pseudo-adhesive label was peeled off from the pseudo-adhesive layer under the conditions of peeling speed: 0.3 m/min and peeling angle: 180°. The magnitude of the force (peeling force) required for this peeling was measured, and the measured peeling force was taken as the pseudo-adhesive force. The unit of pseudo adhesion is mN/50mm.

Similarly, a peel test was performed under the conditions of a peel speed of 10 m/min and a peel angle of 180° to measure the pseudo adhesive force.
A test piece with a width of 50 mm and a length of 150 mm was used for the pseudo adhesion measurement.

(Suitable for pasting corners of corrugated cardboard)
First, the release liner was removed from each of the pseudo-adhesive labels of each of the examples and comparative examples, and the pseudo-adhesive labels were attached in a folded state so as to straddle the corners of the corrugated cardboard box. At this time, the protruding length from the corner of the pseudo-adhesive label, that is, the length by which the pseudo-adhesive label is folded from the end was set to 3 mm. Moreover, the corrugated cardboard box has a substantially rectangular parallelepiped shape, and the angles of the corners are approximately 90°.

Twenty-four hours after application, the lift length of the substrate from the pseudo-adhesive layer was measured.
When the base material did not float, it was evaluated as "◯".

Further, the test was conducted and evaluated in the same manner as above, except that the length of protrusion from the corner was set to 5 mm and 10 mm.

(Peelability)
The substrate of the pseudo-adhesive label was manually peeled off from the pseudo-adhesive layer at low speed (0.3 m/min). The state of the substrate after peeling was visually observed and evaluated.

If the substrate did not curl or curled so weakly that it did not become cylindrical, it was rated as "A".
If the substrate curled into a cylindrical shape, it was evaluated as "B".
If the substrate was torn during peeling, it was evaluated as "C".

Furthermore, the test was conducted and evaluated in the same manner as described above, except that the peeling speed was set to a high speed (10 m/min).
These results are collectively shown in Tables 1 and 2 together with the conditions of the pseudo-adhesive layer.

As is clear from Tables 1 and 2, when the comparative examples using polyethylene as the material constituting the pseudo-adhesive layer are compared with the examples using ethylene-vinyl acetate copolymer, the thickness is the same. Even if there was, in the example, the Young's modulus of the pseudo-adhesive layer was lower than in the comparative example. Moreover, in the example, compared with the comparative example, the initial stress was smaller and the stress relaxation rate was higher. Moreover, it was confirmed that the examples had sufficient pseudo-adhesive strength.

In the corrugated cardboard corner sticking test, in each of the comparative examples, as shown in FIG. In each example, as shown in FIG. 3, no lift of the substrate from the pseudo-adhesive layer was observed, and it was confirmed that unintended peeling of the substrate was suitably prevented.

In particular, when the thickness of the pseudo-adhesive layer was 5.0 μm or more and 18.0 μm or less, the pseudo-adhesive force became more suitable, and more preferable results were obtained.

Further, in the ethylene-vinyl acetate copolymer, when the copolymerization ratio of vinyl acetate was 3% by mass or more and 15% by mass or less, the pseudo-adhesive strength became more preferable, and more preferable results were obtained.

In addition, the pseudo-adhesive force at a peeling speed of 10 m/min is 7000 mN/50 mm or less, so that when the substrate is peeled off from the pseudo-adhesive layer, the substrate is preferably peeled without curling into a cylindrical shape. was made.

In addition, when the pseudo-adhesive labels of Examples and Comparative Examples were attached to soft resin bags, respectively, and the pseudo-adhesive labels were folded together with the bags, in the comparative example, the pseudo-adhesive layer of the base material lifted. However, in the examples, the base material was not lifted from the pseudo-adhesive layer, and it was confirmed that unintended peeling of the base material was suitably prevented.

DESCRIPTION OF SYMBOLS 1... Pseudo-adhesive label 10... Base material 20... Pseudo-adhesive layer 30... Adhesive layer 40... Release liner 50... Pseudo-adhesive layer (comparative example)
100: adherend A: interface B: interface C: interface

Claims (9)

a substrate;
A pseudo-adhesive layer provided on one surface side of the base material;
A pressure-sensitive adhesive layer provided adjacent to the side opposite to the base material of the pseudo-adhesive layer,
The pseudo-adhesive layer contains a copolymer of ethylene and other monomers,
A pseudo-adhesive label, wherein the pseudo-adhesive label is configured to be peeled off at an interface between the substrate and the pseudo-adhesive layer. The pseudo-adhesive label according to claim 1, wherein the pseudo-adhesive layer contains an ethylene-vinyl acetate copolymer. 3. The pseudo-adhesive label according to claim 2, wherein the copolymerization ratio of vinyl acetate in the ethylene-vinyl acetate copolymer is 3% by mass or more and 15% by mass or less. The pseudo-adhesive label according to any one of claims 1 to 3, wherein the pseudo-adhesive layer has a thickness of 5.0 µm or more and 18.0 µm or less. The pseudo adhesive layer according to any one of claims 1 to 4, wherein the pseudo adhesive layer has a Young's modulus of 20 MPa or more and 80 MPa or less measured by a method according to JIS K7161-1:2014 and JIS K 7127:1999. adhesive label. The pseudo-adhesive layer is a rectangular sample piece with a width of 15 mm and a length of 200 mm. When the initial stress value measured by performing a tensile test with 5% elongation at a speed of 2 m / min is S1 [MPa], and the residual stress value 5 minutes after the start of measurement is S2 [MPa], the following formula:
Stress relaxation rate (%) = {(S1-S2)/S1} x 100
The pseudo-adhesive label according to any one of claims 1 to 5, wherein the stress relaxation rate represented by is 12% or more. The pseudo-adhesive force between the base material and the pseudo-adhesive layer measured at a peel speed of 10 m/min in a 180° peel test defined in JIS Z 0237:2009 is 4000 mN/50 mm or more and 7000 mN/50 mm or less. The pseudo-adhesive label according to any one of 1 to 6. A pseudo-adhesive label according to any one of claims 1 to 7, wherein said pseudo-adhesive layer and said adhesive layer are substantially transparent. A pseudo-adhesive label according to any one of claims 1 to 8 for use as a shipping label.

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