JP7367276B2 - Adhesive sheets and how to use them - Google Patents

Description

The present invention relates to a pressure-sensitive adhesive sheet and a method of using the pressure-sensitive adhesive sheet.

Conventionally, in logistics management systems such as courier services, invoices with delivery information such as the delivery destination, or labels with barcodes or characters representing delivery information printed on them, are used to store shipping containers such as cardboard or plastic containers. Logistics is managed by pasting the information on the documents (for example, see Patent Document 1).

In addition, on a production line in a factory, it is necessary to manage the schedule of a work process that systematically incorporates a wide variety of tasks, such as carrying in materials as well as carrying in various types of equipment that make up the production line. In this kind of process control, labels are affixed to the production target itself or to transportation containers such as trays and containers, and the correspondence between the identification information registered on the label and the check items for each process is checked for each process. They are registered sequentially and the progress of the work is managed (for example, see Patent Document 2).

However, during the logistics and manufacturing processes, there is a possibility that the label may peel off from the container etc. for some reason. When such peeling occurs, there is a problem in that it becomes difficult to read delivery information and process information, making logistics management and process management complicated. In the worst case, the destination of the package may become illegible, and delivery may become impossible.

In this way, for labels used in logistics management, process management, etc., there has been a need for technology that can carry the same information on the adherend even if the label is peeled off. It was difficult to achieve this with general-purpose products that are distributed in Japan.

Japanese Patent Application Publication No. 2005-212959 Japanese Patent Application Publication No. 2006-072601

An object of the present invention is to provide a pressure-sensitive adhesive sheet that has a simple configuration, can easily form corresponding patterns on a plurality of members, and can use the patterns formed on these members as information. Another object of the present invention is to provide a method for using the pressure-sensitive adhesive sheet.

Such objects are achieved by the present invention described in (1) to (6) below.
(1) A pressure-sensitive adhesive sheet comprising a base material and a pressure-sensitive adhesive layer made of a pressure-sensitive adhesive composition containing a pressure-sensitive adhesive,
The adhesive layer has regions where the degree of curing of the adhesive differs from each other,
After the adhesive sheet is attached to an adherend, when it is peeled off from the adherend, a portion of the adhesive composition with a low degree of curing of the adhesive is selectively applied onto the adherend. By causing the information to remain, the first information is carried on the adherend, and the adhesive sheet peeled from the adherend is made to carry second information corresponding to the first information. An adhesive sheet characterized by:

(2) The adhesive sheet according to (1) above, wherein the first information and the second information are one-dimensional codes or two-dimensional codes.

(3) The pressure-sensitive adhesive sheet according to (1) or (2) above, wherein the first information and the second information are used for at least one of process management and logistics management.

(4) A pasting step of pasting onto an adherend a pressure-sensitive adhesive sheet comprising a base material and a pressure-sensitive adhesive layer comprising a pressure-sensitive adhesive composition containing a pressure-sensitive adhesive and having portions where the degree of curing of the pressure-sensitive adhesive differs from each other. and,
By peeling off the adhesive sheet from the adherend and selectively leaving a portion of the adhesive composition with a low degree of curing on the adherend, the adhesive sheet is removed from the adherend. A method of using a pressure-sensitive adhesive sheet, the method comprising: carrying first information and a peeling step of causing the pressure-sensitive adhesive sheet peeled from the adherend to carry second information corresponding to the first information. .

(5) The method of using an adhesive sheet according to (4) above, wherein the first information and the second information are one-dimensional codes or two-dimensional codes.

(6) The method of using a pressure-sensitive adhesive sheet according to (4) or (5) above, wherein the first information and the second information are used for at least one of process management and logistics management.

According to the present invention, there is provided a pressure-sensitive adhesive sheet that has a simple configuration, can easily form corresponding patterns on a plurality of members, and can use the patterns formed on these members as information. In particular, it is possible to provide a method for using the pressure-sensitive adhesive sheet.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic vertical cross-sectional view showing a preferred embodiment of a pressure-sensitive adhesive sheet of the present invention. FIG. 1 is a schematic vertical cross-sectional view showing a preferred embodiment (first method) of a method for manufacturing an adhesive sheet. FIG. 1 is a schematic vertical cross-sectional view showing a preferred embodiment (first method) of a method for manufacturing an adhesive sheet. FIG. 1 is a schematic vertical cross-sectional view showing a preferred embodiment (first method) of a method for manufacturing an adhesive sheet. FIG. 3 is a schematic vertical cross-sectional view showing another preferred embodiment (second method) of the method for producing a pressure-sensitive adhesive sheet. FIG. 3 is a schematic vertical cross-sectional view showing another preferred embodiment (second method) of the method for producing a pressure-sensitive adhesive sheet. FIG. 3 is a schematic vertical cross-sectional view showing another preferred embodiment (second method) of the method for producing a pressure-sensitive adhesive sheet. FIG. 2 is a schematic vertical cross-sectional view showing an example of a state in which an adhesive sheet is attached to an adherend. FIG. 9 is a schematic vertical cross-sectional view showing an example of a state in which the adhesive sheet shown in FIG. 8 is about to be peeled off from an adherend. FIG. 9 is a schematic vertical cross-sectional view showing an example of a state in which the adhesive sheet shown in FIG. 8 is peeled off from an adherend. FIG. 3 is a schematic vertical cross-sectional view showing a state in which the adhesive composition remaining on the adherend is colored. FIG. 3 is a schematic vertical cross-sectional view showing a state in which a pressure-sensitive adhesive sheet peeled from an adherend is colored.

Hereinafter, preferred embodiments of the present invention will be described in detail.
[Adhesive sheet]
First, the adhesive sheet of the present invention will be explained.
FIG. 1 is a schematic longitudinal sectional view showing a preferred embodiment of the adhesive sheet of the present invention.

The adhesive sheet 1 includes a base material 10 and an adhesive layer 20 made of an adhesive composition containing an adhesive. The adhesive layer 20 has regions where the degree of curing of the adhesive is different from each other, and when the adhesive sheet 1 is attached to the adherend 100 and then peeled from the adherend 100, the adhesive composition is removed. It is configured such that a portion of the adhesive with a low degree of curing can selectively remain on the adherend 100.

In this way, a portion of the adhesive composition with a relatively low degree of curing selectively remains on the adherend 100 (in other words, creates adhesive residue 23), so that the adherend 100 A predetermined pattern (first pattern) is formed. On the other hand, the adhesive composition remains on the adherend 100, in other words, a part of the adhesive composition from the adhesive sheet 1 transfers to the adherend 100, so that it is peeled off from the adherend 100. A pattern (second pattern) corresponding to the pattern (first pattern) formed on the adherend 100 is formed on the adhesive sheet 1 . The first pattern and the second pattern can be said to have a mutually complementary relationship, and can also be said to be inverted patterns.

The adherend 100 on which the first pattern is formed carries the first information, and the adhesive sheet 1 on which the second pattern is formed carries the second information. This pattern carries the second information.

As a result, corresponding patterns can be easily formed on a plurality of members (i.e., the adhesive sheet 1 and the adherend 100) with a simple configuration, and the patterns formed on these members can be used as information. It is possible to provide a pressure-sensitive adhesive sheet 1 that can be used.

As a result, for example, the management of the plurality of members, the process management of the adherend 100, the physical distribution management, etc. can be suitably performed using the first information and the second information that are the corresponding information.

In the adhesive sheet 1, the base material 10 may have a base material body 11 and a printed layer 12 as described later, but illustration of these is omitted in FIG. The same applies to 12).

The contents represented as the first information and the second information are not particularly limited, and may include, for example, various characters, symbols, codes, points, lines, figures, or a combination of two or more thereof. Yes, it can have any content.

Preferably, the first information and the second information are one-dimensional codes or two-dimensional codes.

Thereby, the information density per area of the first information and the second information can be increased.

A one-dimensional code is a display type code that has information only in the horizontal direction, and includes barcodes that express numbers and characters depending on the thickness of striped lines.

A two-dimensional code is a display type code that contains information in the horizontal and vertical directions, and there are two types: a matrix type (matrix code) in which small squares are arranged vertically and horizontally, and a stack type in which multiple one-dimensional barcodes are stacked vertically. (Stack code). Examples of matrix-type two-dimensional codes include QR (Quick Response) codes (registered trademark), SP (Super) codes, and CP (Computer Purpose) codes. Further, as a stacked two-dimensional code, for example, a PDF (Portable Data File) 417 can be mentioned.

If the pressure-sensitive adhesive sheet 1 has parts in the pressure-sensitive adhesive layer 20 where the degree of curing of the pressure-sensitive adhesive differs from each other, for example, the material of the pressure-sensitive adhesive layer 20 (adhesive composition) and the pattern formation method (adhesive There are no particular limitations on the method for forming regions with different degrees of curing of the agent.

In the adhesive sheet 1 of this embodiment, in the adhesive layer 20, the cured portion 21 is a portion where the degree of cure of the adhesive is relatively high, and the cured portion 21 is a portion where the degree of cure of the adhesive is different from each other. The uncured portions 22, which are relatively low portions, are arranged in a predetermined pattern, thereby forming a predetermined pattern.

(Base material)
The base material 10 becomes a support that supports the adhesive layer 20.

The constituent material of the base material 10 is not particularly limited, and for example, paper, plastic, metal, etc. can be used.

Moreover, the constituent material of the base material 10 can also be selected according to the manufacturing method of the adhesive sheet 1, for example. More specifically, for example, when manufacturing the adhesive sheet 1 using a method that will be described in detail later, the base material 10 may be Component materials can be selected.

Further, the base material 10 may have a single layer structure or a multilayer structure in which a plurality of layers are laminated. Further, the composition of the base material 10 may be constant in the thickness direction, or may have a gradient structure that gradually changes.

Moreover, the base material 10 may be colorless and transparent, or may be colored, for example.

When the base material 10 is colored, for example, when a printed layer is provided on the base material 10, the visibility and distinguishability of the printed layer can be improved regardless of the conditions of the adherend 100. can.

Moreover, by coloring the base material 10, not only can the visibility and identification of the first pattern be improved, but also the adhesive layer 20 can be The difference in contrast between the cured portion 21 and the non-cured portion 22 can be further increased, and the visibility and distinguishability of the second pattern can also be improved.

In particular, even when the first pattern and the second pattern are fine patterns such as a barcode or a QR code (registered trademark), the reading accuracy can be improved more suitably.

The thickness of the base material 10 is not particularly limited, but is preferably 15 μm or more and 300 μm or less, more preferably 30 μm or more and 200 μm or less.

The base material 10 may be provided with a printing layer (not shown), for example.
The pattern of the printing layer formed on the base material 10 is not particularly limited, and may include, for example, various characters, symbols, codes, dots, lines, figures, or a combination of two or more thereof, and may be any pattern. It can be the content. Further, for example, a plurality of pressure-sensitive adhesive sheets 1 may be provided with printed layers having the same pattern, or may have printed layers with different patterns.

(Adhesive layer)
The adhesive layer 20 is a part that contacts and joins the adherend 100 when the adhesive sheet 1 is attached to the adherend 100.

The adhesive layer 20 is composed of an adhesive composition containing an adhesive.
In the adhesive layer 20, portions having different degrees of curing of the adhesive, specifically, cured portions 21 and uncured portions 22 are arranged in a predetermined pattern. This makes it possible to form the first pattern and the second pattern.

In the adhesive layer 20, the method of arranging the cured portion 21 and the non-cured portion 22 in a predetermined pattern is not particularly limited, but for example, a thermosetting type that can undergo a curing reaction by applying heat. A method of forming an adhesive composition layer using an adhesive composition and heating the adhesive composition layer in a predetermined pattern, using an electromagnetic wave curable adhesive composition that can undergo a curing reaction by irradiation with electromagnetic waves. For example, a method may be used in which a pressure-sensitive adhesive composition layer is formed by applying electromagnetic waves to the pressure-sensitive adhesive composition layer in a predetermined pattern.

The electromagnetic wave is not particularly limited as long as it can cause a curing reaction (for example, a crosslinking reaction) in the pressure-sensitive adhesive composition, and examples thereof include ultraviolet rays, laser, and the like.

Furthermore, the method of irradiating the adhesive composition layer with electromagnetic waves is not particularly limited, and the adhesive composition layer may be irradiated with electromagnetic waves in the form of a beam, and the electromagnetic wave beam may be scanned in a predetermined pattern. However, using a mask in which a shielding layer (printed layer) is formed in a predetermined pattern, the adhesive composition layer may be irradiated with electromagnetic waves through the voids of the mask.

Among these, the adhesive composition used for forming the adhesive layer 20 is preferably an ultraviolet curable adhesive composition that can undergo a curing reaction (crosslinking reaction) when irradiated with ultraviolet C waves (UVC). (Crosslinking reaction) UV C wave curable pressure-sensitive adhesive compositions are more preferred.

The following description will focus on the case where the adhesive layer 20 is formed using an ultraviolet C wave curable adhesive composition that can undergo a curing reaction (crosslinking reaction) upon irradiation with ultraviolet C waves. .

In this specification, ultraviolet C waves are ultraviolet rays in a wavelength range of 200 nm or more and less than 280 nm. Ultraviolet C waves are included in sunlight, but because they are absorbed by the ozone layer, they are substantially not included in sunlight that reaches the earth's surface.

Although specifically described later, in this embodiment, by using ultraviolet C waves to cure the adhesive layer 20, the adhesive layer 20 has a cured portion (crosslinked portion) 21 and a non-cured portion (non-crosslinked portion). 22 can be suitably formed. Further, since the ultraviolet C wave has a short wavelength and high energy, it is possible to cure the adhesive layer 20 (formation of the cured portion 21) more efficiently and in a short time.

Furthermore, since ultraviolet C waves are not substantially included in sunlight on the ground, when storing the laminate 50 or the adhesive sheet 1, or when using the adhesive sheet 1, it is necessary to It is possible to effectively prevent the cured portion 22 (non-crosslinked portion) from unintentionally undergoing a curing (crosslinking) reaction.

As the ultraviolet C wave curable adhesive composition, for example, one containing a polymer having an ultraviolet C wave reactive group that contributes to a crosslinking reaction upon irradiation with ultraviolet C waves can be used.

In addition, the ultraviolet C wave curable adhesive composition includes, for example, in addition to a polymer exhibiting adhesiveness, a low molecular compound having an ultraviolet C wave reactive group that contributes to a crosslinking reaction upon irradiation with ultraviolet C waves. can be used.

The ultraviolet C-wave reactive group is excited by ultraviolet C-wave irradiation and generates radicals that trigger a curing reaction (crosslinking reaction).

Examples of the ultraviolet C wave reactive group include a functional group having a benzophenone structure, a functional group having a benzyl structure, a functional group having an o-benzoylbenzoic acid ester structure, a functional group having a thioxanthone structure, and a 3-ketocoumarin structure. Examples include a functional group, a functional group having a 2-ethylanthraquinone structure, a functional group having a camphorquinone structure, etc., and a functional group having a benzophenone structure is preferable.

Thereby, it is possible to make the reactivity to ultraviolet C waves more excellent, and to make the stability against stimuli other than ultraviolet C waves more excellent.

From the viewpoint of transparency, the ultraviolet C wave-curable adhesive composition preferably contains an acrylic polymer as the adhesive polymer.

Acrylic polymers are polymers or copolymers of acrylic monomers.
Examples of acrylic monomers include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, sec-butyl (meth)acrylate, n-hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, n-nonyl (meth)acrylate, isononyl (meth)acrylate, n-decyl (meth)acrylate Examples include alkyl (meth)acrylates such as acrylate and lauryl (meth)acrylate. In particular, acrylic polymers include alkyl (meth)acrylates in which the number of carbon atoms in the alkyl group is 1 or more and 8 or less as the acrylic monomer. It is preferable. Among the alkyl (meth)acrylates in which the alkyl group has 1 to 8 carbon atoms, 2-ethylhexyl (meth)acrylate, methyl (meth)acrylate and butyl (meth)acrylate are particularly preferred.

When the polymer contained in the ultraviolet C wave curable pressure-sensitive adhesive composition has an ultraviolet C wave reactive group, the ultraviolet C wave reactive group is usually introduced into the side chain of the polymer.

In particular, when the acrylic polymer has an ultraviolet C wave reactive group, the proportion of the ultraviolet C wave reactive group to the entire acrylic polymer is 0.1% by mass or more and 5.0% by mass or less. The content is preferably 0.2% by mass or more and 3.0% by mass or less.

Thereby, the pot life of the ultraviolet C wave curable adhesive composition can be made longer, and the adhesiveness of the adhesive layer 20 can be made more excellent.

An example of an acrylic polymer exhibiting such an ultraviolet C-wave reactive group is commercially available from BASF under the trade name "acResin (registered trademark)." "acResin (registered trademark) UV" includes "acResin (registered trademark) A250 UV," "acResin (registered trademark) A260 UV," "acResin (registered trademark) A204 UV," and "acResin (registered trademark) UV 3532." can be mentioned.

When using an ultraviolet C wave curable adhesive composition that contains a low molecular compound having an ultraviolet C wave reactive group in addition to the adhesive polymer, the low molecular compound is contained as a crosslinking agent. be able to.

Examples of the crosslinking agent include a monomer having a benzophenone structure, a monomer having a benzyl structure, a monomer having an o-benzoylbenzoate structure, a monomer having a thioxanthone structure, a monomer having a 3-ketocoumarin structure, and a 2-ethylanthraquinone structure. Examples include monomers having a camphorquinone structure, and monomers having a camphorquinone structure.

The content of the crosslinking agent in the ultraviolet C wave curable adhesive composition is preferably 5 parts by mass or more and 25 parts by mass or less, and 6 parts by mass or more and 23 parts by mass or less, based on 100 parts by mass of the polymer. It is more preferable that

In addition to the above-mentioned components, the ultraviolet C wave curable adhesive composition may also contain a dispersant, a tackifier, an antioxidant, a polymerization initiator, an ultraviolet absorber, a light stabilizer, a heat stabilizer, and a softener, if necessary. Other components such as a silane coupling agent, a filler, a coloring agent, and an antistatic agent may also be blended. These may be used alone or in combination of two or more.

The ultraviolet C wave curable adhesive composition may be any adhesive composition as long as it has the property of being cured by irradiation with ultraviolet C waves, but is preferably a hot melt adhesive composition.

Thereby, the adhesive layer 20 having excellent adhesion to the base material 10 can be formed more suitably.

Here, the hot melt adhesive composition refers to a type of adhesive composition that melts when heated and becomes spreadable and coatable, and develops adhesiveness and cohesive force when cooled.

As the ultraviolet C wave curable hot melt adhesive composition, for example, a benzophenone group-containing acrylic hot melt adhesive composition is commercially available from BASF under the trade name "acResin (registered trademark)". Further, an acrylic hot melt adhesive composition is commercially available from Henkel under the trade name "LOCTITE DURO-TAK (registered trademark) UV 4606".

The thickness of the adhesive layer 20 is preferably 5 μm or more and 100 μm or less, more preferably 10 μm or more and 50 μm or less.

As a result, workability when adhering the adhesive sheet 1 to the adherend 100 is improved, and when the adhesive sheet 1 stuck to the adherend 100 is peeled off from the adherend 100, In addition, traces of peeling can be better identified.

(Release liner)
A release liner 30 may be attached to the adhesive layer 20.

The release liner 30 has a function of protecting the adhesive layer 20 at least during the production of the adhesive sheet 1. Further, the release liner 30 may have a function of protecting the adhesive layer 20 at least when the adhesive sheet 1 is stored.

The constituent material of the release liner 30 can also be selected depending on the manufacturing method of the adhesive sheet 1, for example. More specifically, for example, when manufacturing the adhesive sheet 1 using a method described in detail later, the release liner 30 may be modified depending on the ultraviolet C wave (UVC) transmittance required for the release liner 30. Component materials can be selected.

The release liner 30 has releasability with respect to the adhesive layer 20. When the adhesive sheet 1 is attached to the adherend 100, the release liner 30 is peeled off from the adhesive layer 20.

The release liner 30 may be subjected to a release treatment. Examples of the release agent used in the release treatment include silicone, olefin resin, isoprene resin, butadiene resin, long chain alkyl resin, alkyd resin, and the like.

The thickness of the release liner 30 is not particularly limited, but is preferably 10 μm or more and 150 μm or less, more preferably 20 μm or more and 130 μm or less.

As will be detailed later, the adhesive sheet 1 contains the adhesive composition remaining on the adherend 100 (in other words, the adhesive residue 23) after the adhesive sheet 1 is peeled from the adherend 100, and the adhesive composition remaining on the adherend 100. A coloring material is selectively attached to at least one of the parts of the adhesive layer 20 of the adhesive sheet 1 peeled from the body 100 from which the adhesive composition has not been removed in the in-plane direction of the adhesive sheet 1. It is preferable to use

Thereby, the visibility and identifiability of the first information carried on the adherend 100 and the second information carried on the adhesive sheet 1 can be further improved.

In such a case, the colored material is a colored sheet 60 having a colored layer 62 made of a material containing a coloring agent, and the adhesive composition (adhesive residue 23) remaining on the adherend 100 and the adhesive composition (adhesive residue 23) remaining on the adherend 100. After contacting at least one of the parts of the adhesive layer 20 of the adhesive sheet 1 peeled from the adherent 100 from which the adhesive composition has not been removed in the in-plane direction of the adhesive sheet 1, the adhesive sheet 1 is peeled off. Therefore, it is preferable that the material adheres to and remains at the site.

As a result, the adhesive composition (adhesive residue 23) remaining on the adherend 100 and the adhesive layer 20 of the adhesive sheet 1 peeled from the adherend 100 are removed in the in-plane direction of the adhesive sheet 1. A coloring material can be selectively attached to at least one of the areas from which the adhesive composition has not been removed by a simple method.

[Method for manufacturing adhesive sheet]
Next, a method for manufacturing an adhesive sheet will be explained.

The pressure-sensitive adhesive sheet of the present invention may be manufactured by any method, but, for example, it can be suitably manufactured by the following methods (first method, second method).

《First method》
2 to 4 are schematic vertical cross-sectional views showing a preferred embodiment (first method) of a method for manufacturing a pressure-sensitive adhesive sheet.

The first method includes a base material 10 that does not substantially transmit ultraviolet C waves, an adhesive composition layer 20' that is cured by ultraviolet C waves, a liner body 31 that transmits ultraviolet C waves, and a liner body 31 that substantially transmits ultraviolet C waves. a laminate preparation step in which a laminate 50 is prepared in which a release liner 30 having a printed layer 32 that does not transmit the light is laminated in this order; and a laminate 50 is irradiated with a light beam containing ultraviolet C waves from the release liner 30 side. The method includes a curing step of partially curing the adhesive composition layer 20'.

In the first method, ultraviolet light, particularly ultraviolet C light, is used for the curing reaction (crosslinking reaction) of the adhesive composition layer 20'.

In particular, in this embodiment, the printed layer 32 of the adhesive composition layer 20' is formed by irradiating the adhesive composition layer 20' with a light beam containing ultraviolet C waves from the release liner 30 side. The UV C waves are selectively incident on areas where there is no printed layer 32, and the adhesive composition layer 20' has cured areas (crosslinked areas) in a pattern corresponding to the area where the printed layer 32 is not provided (inverted pattern of the printed layer 32). ) 21 is formed, and the other portion becomes a non-cured portion (non-crosslinked portion) 22. As a result, the adhesive composition layer 20' becomes an adhesive layer 20 having a cured portion (crosslinked portion) 21 and an uncured portion (non-crosslinked portion) 22 (see FIG. 4).

As used herein, "not substantially transmitting ultraviolet C waves" means that the transmittance of ultraviolet C waves having a wavelength of 200 nm or more and less than 280 nm is 3% or less, and particularly The transmittance is preferably 1% or less, more preferably 0.5% or less.

In this specification, "transmits ultraviolet C waves" or "has ultraviolet C wave transmittance" refers to a transmittance of ultraviolet C waves of 30% or more.

Each step will be explained below.
<Laminated body preparation process>
In the laminate preparation step, as shown in FIG. 2, a base material 10 that does not substantially transmit ultraviolet C waves, and an adhesive composition layer that is provided on one side of the base material 10 and is cured by ultraviolet C waves. 20' and a release liner 30 in contact with the adhesive composition layer 20'. The release liner 30 has a liner body 31 that transmits ultraviolet C waves and a printed layer 32 that substantially does not transmit ultraviolet C waves.

In the laminate preparation step, the laminate 50 as described above may be prepared, but for example, an ultraviolet C wave curable adhesive composition that is cured by ultraviolet C waves is coated on one side of the base material 10. a pressure-sensitive adhesive composition layer forming step of forming a pressure-sensitive adhesive composition layer 20'; and a release liner 30 (liner main body 31 on which the printed layer 32 is not provided) is bonded onto the pressure-sensitive adhesive composition layer 20'. It may include a bonding step and a printing step of forming a printed layer 32 on the surface of the release liner 30 opposite to the surface facing the adhesive composition layer 20'.

Thereby, the laminate 50 can be obtained more efficiently, and the productivity of the pressure-sensitive adhesive sheet 1 can be improved. In particular, by storing the laminate without the printed layer 32, the productivity of the pressure-sensitive adhesive sheet 1 can be improved. Furthermore, by storing the laminate without the printed layer 32, it is possible to suitably form the printed layer 32 in a pattern that meets the customer's needs, for example. Further, it is possible to suitably correspond to the formation of the printed layer 32 with different patterns.

Note that the printed layer 32 may be formed on the liner body 31 before being bonded to the adhesive composition layer 20'. Alternatively, the adhesive composition layer 20' may be formed on the release liner 30 and then bonded to the substrate 10. In addition, in the illustrated configuration, the printed layer 32 is provided on the outer surface of the release liner 30 (the surface opposite to the surface facing the adhesive composition layer 20') in the laminate 50; A portion may be provided inside the liner body 31 (for example, something impregnated inside the liner body 31, etc.), or a part of the adhesive composition layer 20' of the release liner 30 may be provided in the laminate 50. It may be provided on opposing surfaces.

The base material 10 as a whole only needs to be a material that does not substantially transmit ultraviolet C waves in its thickness direction. Any material may be used as long as the light is reflected or absorbed by a part or all of 10 and does not pass through to the other surface. Note that a portion of the base material 10 in its thickness direction may be made of a material that is transparent to ultraviolet C waves.

Examples of the constituent material of the base material 10 include paper, plastic, metal, etc., and one type or a combination of two or more types selected from these can be used.

In particular, the base material 10 is preferably made of a material containing polyethylene terephthalate (PET).

Thereby, the transparency of the base material 10 can be improved. Therefore, the aesthetics of the pressure-sensitive adhesive sheet 1 when the printed layer is provided on the base material 10 can be improved. Further, the adhesion between the base material 10 and the printed layer provided on the base material 10 (particularly the printed layer formed using ultraviolet curable ink) can be improved. Moreover, pressure-sensitive adhesive sheets 1 having various appearances can be suitably manufactured. Furthermore, the adhesion between the base material 10 and the adhesive composition layer 20' (adhesive layer 20) can be improved.

When the base material 10 is made of a material containing polyethylene terephthalate, the content of polyethylene terephthalate in the base material is preferably 50% by mass or more, more preferably 80% by mass or more, More preferably, it is 90% by mass or more.
Thereby, the above-mentioned effects are more prominently exhibited.

When the base material 10 has a multilayer structure, for example, at least one layer can be made of a material that does not substantially transmit ultraviolet C waves. More specifically, for example, even if the base material body is made of a material that transmits ultraviolet C waves, the base material 10 may be made impermeable to ultraviolet C waves by vapor-depositing metal on at least one surface thereof. (reflectivity). Examples of the metal material include aluminum.

For example, even if the main component of the base material 10 is one that transmits ultraviolet C waves, by adding an ultraviolet absorber that absorbs ultraviolet C waves, the base material 10 can be made opaque to ultraviolet C waves. can do.

When the adhesive sheet 1 is stored or used, the base material 10 side is usually exposed to the surface. Although ultraviolet C waves are hardly included in sunlight on the ground, the base material 10 substantially does not transmit ultraviolet C waves, so that they do not pass through the base material 10 during storage or use. It is possible to effectively prevent unintentional curing (crosslinking), particularly of the uncured portion 22 (non-crosslinked portion) of the adhesive layer 20, due to the light reaching the adhesive layer 20.

Furthermore, in the case where a printed layer is formed on the base material 10 using an ultraviolet curable ink, the printed layer (base material 10) may be formed after the adhesive layer 20 (adhesive composition layer 20') is formed. Since the ultraviolet C waves contained in the ultraviolet rays used for curing the ultraviolet curable ink are preferably prevented from being transmitted through the base material 10, the adhesive layer 20 (adhesive composition layer 20') This can effectively prevent unintentional curing (crosslinking).

When forming a printing layer on the substrate 10 using an ultraviolet curable ink in a state where the adhesive composition layer 20' (adhesive layer 20) is laminated on the substrate 10, the ultraviolet curable ink is usually used. is used to print on the base material 10, and the ink is cured by irradiating ultraviolet rays from the side of the base material 10 to which the ink has been applied. Here, if the ultraviolet C waves included in the ultraviolet rays reach the adhesive composition layer 20' (adhesive layer 20), the adhesive composition layer 20' (adhesive layer 20) will be unintentionally cured. However, since the base material 10 does not substantially transmit ultraviolet C waves, the occurrence of the above-mentioned problems can be effectively prevented.

In addition, when providing a printing layer on the base material 10, the formation timing is not specifically limited, For example, it may be before the hardening process mentioned later, and may be after the hardening process. Furthermore, a printing layer may be formed on the base material 10 before forming the adhesive composition layer 20' on the base material 10.

(Adhesive composition layer forming step)
In the adhesive composition layer forming step, an ultraviolet C wave curable adhesive composition is applied to one side of the base material 10 to form an adhesive composition layer 20'.

The method for forming the adhesive composition layer 20' is not particularly limited, but when the ultraviolet C wave curable adhesive composition is an ultraviolet C wave curable hot melt adhesive composition, a melt extrusion method is preferably employed. be able to. More specifically, the adhesive composition layer 20' is suitably formed by supplying a molten ultraviolet C wave-curable adhesive composition onto the base material 10 from a T-die or the like using an extruder. be able to.

When the ultraviolet C wave curable adhesive composition is an ultraviolet C wave curable hot melt adhesive composition, when forming the adhesive composition layer 20' (the ultraviolet C wave curable adhesive composition is placed on the base material). The UV C wave curable adhesive composition may be heated so as to be melted (when supplied to The temperature is preferably 210°C or higher, and more preferably 130°C or higher and 190°C or lower.

When the ultraviolet C wave curable adhesive composition is an ultraviolet C wave curable hot melt adhesive composition, the softening point of the ultraviolet C wave curable adhesive composition is preferably 90°C or more and 150°C or less. , more preferably 100°C or more and 150°C or less.

Further, when the ultraviolet C wave curable adhesive composition is an ultraviolet C wave curable hot melt adhesive composition, the melt viscosity of the ultraviolet C wave curable adhesive composition at 160°C is 2000 mPa·s or more and 13000 mPa·s. s or less, more preferably 4000 mPa·s or more and 12000 mPa·s or less.

Note that the melt viscosity of the ultraviolet C wave curable adhesive composition can be determined by measurement according to JIS K6862:1984.

(Lamination process)
In the bonding step, a liner body 31 that transmits ultraviolet C waves is bonded onto the adhesive composition layer 20' formed on the base material 10.

By using the liner main body 31 having ultraviolet C wave transmittance, the adhesive composition layer 20' is irradiated with ultraviolet C waves through the release liner 30 having the liner main body 31 to cure the adhesive composition layer 20'. can be done. At this time, since oxygen is blocked, there is an advantage that the curing speed of the adhesive becomes faster.

The transmittance of ultraviolet C waves for the liner body 31 may be 30% or more, preferably 50% or more, and more preferably 70% or more.

Thereby, the curing reaction (crosslinking reaction) of the adhesive composition layer 20' can proceed more suitably.

Examples of the constituent material of the liner body 31 include polyethylene, polypropylene, and the like.

(Printing process)
In the printing process, a printing layer 32 that does not substantially transmit ultraviolet C waves is formed on the side of the liner body 31 opposite to the surface facing the adhesive composition layer 20'.

The ink is not particularly limited as long as it can form the printed layer 32 that does not substantially transmit ultraviolet C waves, but usually the ink itself does not substantially transmit ultraviolet C waves.

As the ink, for example, oil-based ink, water-based ink, latex ink, ultraviolet curable ink, etc. can be used. For example, when using an ultraviolet curable ink, the printed layer 32 may be in an uncured state before the curing step of partially curing the adhesive composition layer 20'.

The method for forming the printing layer 32 (printing method) is not particularly limited, but includes, for example, flexo printing, offset printing, gravure printing, screen printing, inkjet printing, laser beam dry electrophotographic printing, melting type or sublimation type thermal transfer printing, etc. Various printing methods can be mentioned.

The printed content (print pattern) of the printed layer 32 is not particularly limited, and includes, for example, various characters, symbols, codes, dots, lines, figures, etc., and two or more types selected from these may be combined. . Furthermore, for example, the printed layers 32 of the same pattern may be provided for the portions that are to become a plurality of adhesive sheets 1, or the printed layers 32 of different patterns may be provided. Further, the printed content (print pattern) of the print layer 32 may be, for example, a one-dimensional barcode, a two-dimensional code such as a QR code (registered trademark), or the like.

The thickness of the printing layer 32 is not particularly limited as long as it does not substantially transmit ultraviolet C waves, but it is preferably 0.5 μm or more and 50 μm or less, more preferably 1.0 μm or more and 30 μm or less, and 1.0 μm or more and 30 μm or less. More preferably, the thickness is .0 μm or more and 20 μm or less.

<Curing process>
In the curing step, as shown in FIG. 3, the adhesive composition layer 20' is partially cured by irradiating the adhesive composition layer 20' with a light beam containing ultraviolet C waves from the release liner 30 side.

Thereby, the adhesive composition layer 20' is made into an adhesive layer 20 having a cured portion (crosslinked portion) 21 and an uncured portion (non-crosslinked portion) 22.

Curing of the adhesive composition layer 20' is performed by irradiating a light beam containing ultraviolet C waves from an ultraviolet C wave light source (ultraviolet C wave irradiation device) 200.

Examples of the ultraviolet C-wave light source 200 include a high-pressure mercury UV lamp, a low-pressure mercury UV lamp, a metal halide UV lamp, an excimer lamp, and a light emitting diode (LED). Among these, high-pressure mercury UV lamps and metal halide UV lamps are preferred.

When the adhesive composition layer 20' is irradiated with a light beam containing ultraviolet C waves from the release liner 30 side, the print layer 32 masks the ultraviolet C waves that are irradiated onto the patterned portion of the printed layer 32. That is, it is reflected or absorbed by the ink and does not reach the adhesive composition layer 20'. On the other hand, the ultraviolet C waves irradiated to the portions of the printed layer 32 where no pattern is formed (gap portions) pass through the liner body 31 that is transparent to ultraviolet C waves, and reach the adhesive composition layer 20'. .

In the areas of the adhesive composition layer 20' that are irradiated with ultraviolet C waves, a crosslinking reaction is caused and the adhesive composition is cured, but in the areas that are not irradiated with ultraviolet C waves, no crosslinking reaction is caused and the adhesive composition is cured. remains uncured and soft. In this way, the adhesive layer 20 having the cured portion 21 (crosslinked portion) and the uncured portion 22 (non-crosslinked portion) is formed corresponding to the pattern of the printed layer 32 (see FIG. 4).

By using ultraviolet C waves for curing the adhesive composition layer 20', a pattern consisting of a cured portion (crosslinked portion) 21 and a non-cured portion (non-crosslinked portion) 22 can be suitably formed. Further, since the ultraviolet C wave has a short wavelength and high energy, the adhesive composition layer 20' can be cured (formation of the cured portion 21) more efficiently and in a shorter time.

In addition, since ultraviolet C waves are hardly included in sunlight on the ground, when storing the laminate 50 or the adhesive sheet 1, or when using the adhesive sheet 1, it is necessary to 22 (non-crosslinked portion) can be effectively prevented from unintentionally undergoing a curing (crosslinking) reaction.

《Second method》
Next, as a method for manufacturing a pressure-sensitive adhesive sheet, a second method different from the first method described above will be described.

5 to 7 are schematic vertical cross-sectional views showing another preferred embodiment (second method) of the method for producing an adhesive sheet. In the following explanation, differences from the first method described above will be mainly explained, and explanations of similar matters will be omitted.

The second method includes a base material 10 having a base material body 11 that transmits ultraviolet C waves and a printed layer 12 that does not substantially transmit ultraviolet C waves, and an adhesive composition layer 20' that is cured by ultraviolet C waves. a laminate preparation step of preparing a laminate 50 comprising: a curing step of partially curing the adhesive composition layer 20' by irradiating the laminate 50 with a light beam containing ultraviolet C waves from the base material 10 side; (See FIG. 6).

In particular, in the second method, the printed layer 12 of the adhesive composition layer 20' is provided by irradiating the adhesive composition layer 20' with a light beam containing ultraviolet C waves from the base material 10 side. The ultraviolet C waves are selectively incident on the areas where the printed layer 12 is not provided, and the cured portions (cross-linked) are formed in the adhesive composition layer 20' in a pattern (inverted pattern of the printed layer 12) corresponding to the areas where the printed layer 12 is not provided. A non-cured portion (non-crosslinked portion) 22 is formed. As a result, the adhesive composition layer 20' becomes an adhesive layer 20 having a cured portion (crosslinked portion) 21 and an uncured portion (non-crosslinked portion) 22 (see FIG. 7).

Each step will be explained below.
<Laminated body preparation process>
In the laminate preparation step, as shown in FIG. 5, a laminate 50 having a base material 10 and an adhesive composition layer 20' provided on one side of the base material 10 and cured by ultraviolet C waves is prepared. prepare. The base material 10 has a base material body 11 that transmits ultraviolet C waves and a printed layer 12 that does not substantially transmit ultraviolet C waves.

The laminate 50 prepared in the laminate preparation step may have the base material 10 and the adhesive composition layer 20', but in the illustrated configuration, the base material 10 and the adhesive composition layer 20' In addition, a release liner 30 is provided that contacts the adhesive composition layer 20'. In other words, the laminate 50 used in this embodiment has a structure in which the base material 10, the adhesive composition layer 20', and the release liner 30 are laminated in this order.

This makes it possible to improve the ease of handling the laminate 50 in the subsequent process and the workability in the subsequent process, which is advantageous in improving the productivity of the pressure-sensitive adhesive sheet 1. Further, during the manufacturing process of the adhesive sheet 1, it is possible to more effectively prevent dirt such as dust from adhering to the adhesive composition layer 20', and the reliability of the adhesive sheet 1 can be improved.

In the laminate preparation step, the laminate 50 as described above may be prepared. A pressure-sensitive adhesive composition layer forming step of forming a pressure-sensitive adhesive composition layer 20' by coating an ultraviolet C-wave curable pressure-sensitive adhesive composition that is cured by C-waves, and a release liner is applied on the pressure-sensitive adhesive composition layer 20'. 30 and a printing step of forming the printed layer 12 on the side of the substrate body 11 opposite to the surface facing the adhesive composition layer 20'.

Thereby, the laminate 50 can be obtained more efficiently, and the productivity of the pressure-sensitive adhesive sheet 1 can be improved. In particular, by storing the laminate without the printed layer 12, the productivity of the pressure-sensitive adhesive sheet 1 can be improved. Furthermore, by storing the laminate without the printed layer 12, it is possible to suitably form the printed layer 12 in a pattern that meets the customer's needs, for example. Further, it is possible to suitably correspond to the formation of the printed layer 12 with different patterns.

Note that the printed layer 12 may be formed on the base material main body 11 before being bonded to the adhesive composition layer 20'. Alternatively, the adhesive composition layer 20' may be formed on the release liner 30 and then bonded to the base material body 11. In addition, in the illustrated configuration, the printed layer 12 is provided on the outer surface (the surface opposite to the surface facing the adhesive composition layer 20') of the base material main body 11 in the laminate 50; At least a portion thereof may be provided inside the base material main body 11 (for example, a material impregnated inside the base material main body 11, etc.), or the adhesive composition of the base material main body 11 in the laminate 50 may be It may be provided on the side facing the layer 20'.

(Adhesive composition layer forming step)
In the adhesive composition layer forming step, an ultraviolet C wave curable adhesive composition is applied to one side of the base material body 11 to form an adhesive composition layer 20'.

The base material main body 11 constitutes the majority of the base material 10 and serves as a support for supporting the adhesive layer 20 (adhesive composition layer 20') and the printing layer 12.

The base material main body 11 is transparent to ultraviolet C waves.
By using the base material body 11 having ultraviolet C wave transmittance, the adhesive composition layer 20' is irradiated with ultraviolet C waves through the base material 10 having the base material body 11 to form the adhesive composition layer 20'. can be cured. At this time, if the surface of the adhesive composition layer 20', that is, the surface of the adhesive composition layer 20' opposite to the surface facing the base material body 11, is covered with the release liner 30, oxygen This has the advantage of increasing the curing speed of the adhesive.

The transmittance of ultraviolet C waves for the base material body 11 may be 30% or more, preferably 50% or more, and more preferably 70% or more.

Thereby, the curing reaction (crosslinking reaction) of the adhesive composition layer 20' can proceed more suitably.

As a constituent material of the base material main body 11, polyolefins such as polyethylene and polypropylene can be suitably used, for example.

Thereby, the strength of the base material body 11 and the adhesive sheet 1 can be made sufficiently excellent, and the ultraviolet C wave transmittance of the base material body 11 can be made more suitable. As a result, in the curing process described in detail later, the adhesive layer 20 having the cured portion (crosslinked portion) 21 and the uncured portion (non-crosslinked portion) 22 can be suitably formed, resulting in a more reliable adhesive. Sheet 1 can be provided.

The content of the material in the base material body 11 is preferably 90% by mass or more, more preferably 95% by mass or more, and even more preferably 99% by mass or more.
Thereby, the above-mentioned effects are more prominently exhibited.

When the adhesive sheet 1 is stored or used, the base material 10 side is usually exposed to the surface, but since normal environmental light such as sunlight contains almost no ultraviolet C waves, the adhesive sheet 1, during storage or use, light that passes through the base material 10 and reaches the adhesive composition layer 20' may cause unintentionally hardening (particularly the uncured portion 22 (non-crosslinked portion)) of the adhesive layer 20. crosslinking) is effectively prevented.

(Lamination process)
In the bonding step, a release liner 30 is bonded onto the adhesive composition layer 20' formed on the base material body 11.

Examples of the constituent material of the release liner 30 include paper, various plastics such as polyesters such as polyethylene terephthalate (PET), polyolefins such as polyethylene and polypropylene, and metals, and one or more types selected from these. Can be used in combination.

In particular, it is preferable that the release liner 30 is substantially opaque to ultraviolet C waves.

This prevents unwanted curing reactions from progressing in the adhesive composition layer 20' due to UV C waves being irradiated from the side where the release liner 30 is provided during the manufacturing process of the adhesive sheet 1, etc. can be more reliably prevented.

Examples of the constituent material of the release liner 30 that does not substantially transmit ultraviolet C waves include paper, polyester such as polyethylene terephthalate (PET), and metal.

(Printing process)
In the printing process, a printing layer 12 that does not substantially transmit ultraviolet C waves is formed on the surface of the base material body 11 opposite to the surface facing the adhesive composition layer 20'.

The ink is not particularly limited as long as it can form the printed layer 12 that does not substantially transmit ultraviolet C waves, but usually the ink itself does not substantially transmit ultraviolet C waves.

As the ink, the same ink as in the case of the printing layer 32 described above can be used, and an ultraviolet curing ink is particularly preferable.

When using an ultraviolet curable ink, the printed layer 12 may be in an uncured state, for example, before a curing step in which the adhesive composition layer 20' is partially cured.

The method for forming the printed layer 12 (printing method) is not particularly limited, and it can be formed in the same manner as in the case of the printed layer 32 described above.

The printed content (print pattern) of the printed layer 12 is not particularly limited, and can be the same as that of the printed layer 32 described above.

<Curing process>
In the curing step, as shown in FIG. 6, the adhesive composition layer 20' is partially cured by irradiating the adhesive composition layer 20' with a light beam containing ultraviolet C waves from the base material 10 side.

Thereby, the adhesive composition layer 20' is made into an adhesive layer 20 having a cured portion (crosslinked portion) 21 and an uncured portion (non-crosslinked portion) 22.

When the pressure-sensitive adhesive composition layer 20' is irradiated with a light beam containing ultraviolet C waves from the base material 10 side, the print layer 12 masks the ultraviolet C waves irradiated onto the patterned portion of the printed layer 12. That is, it is reflected or absorbed by the ink and does not reach the adhesive composition layer 20'. On the other hand, the ultraviolet C waves irradiated to the portions of the printed layer 12 where no pattern is formed (gap areas) pass through the base material body 11 having ultraviolet C wave transmittance and reach the adhesive composition layer 20'. do.

In the adhesive composition layer 20', a crosslinking reaction is caused in the portions that are irradiated with ultraviolet C waves and the adhesive composition is cured, but a crosslinking reaction is not caused in the portions that are not irradiated with ultraviolet C waves and the adhesive composition is cured. remains uncured and soft. In this way, an adhesive layer 20 having a cured portion 21 (crosslinked portion) and a non-cured portion 22 (non-crosslinked portion) is formed corresponding to the pattern of the printed layer 12 (see FIG. 7).

The adhesive sheet 1 manufactured as described above includes a base material 10 and an adhesive layer 20 made of an adhesive composition containing an adhesive, and the adhesive layer 20 has a hardening degree of the adhesive. They have different parts.

For example, in the adhesive sheet manufactured by the first method, the release liner 30 is peeled off, and the adhesive layer 20 is separated from the other release liner (cured portion 21 (crosslinked portion) and uncured portion 22 (non-crosslinked portion)). It may be protected by a release liner (without a printed layer corresponding to the pattern).

Further, for example, when the adhesive sheet 1 has a long shape, after the release liner 30 is peeled off from the adhesive layer 20, the adhesive sheet 1 is, for example, spirally shaped with the exposed adhesive layer 20 side inside. It may be rolled up and stored and transported as a tape. In this case, the surface of the base material 10 opposite to the surface facing the adhesive layer 20 has releasability.

[How to use adhesive sheet 1]
Next, a method of using the adhesive sheet of the present invention will be explained.

FIG. 8 is a schematic vertical cross-sectional view showing an example of a state in which the adhesive sheet is attached to an adherend. FIG. 9 is a schematic longitudinal sectional view showing an example of a state in which the adhesive sheet shown in FIG. 8 is about to be peeled off from an adherend. FIG. 10 is a schematic vertical cross-sectional view showing an example of a state in which the adhesive sheet shown in FIG. 8 is peeled off from an adherend.

A method of using the pressure-sensitive adhesive sheet 1 of the present invention includes a pressure-sensitive adhesive sheet 1 comprising a base material 10 and a pressure-sensitive adhesive layer 20 that is composed of a pressure-sensitive adhesive composition containing a pressure-sensitive adhesive and has regions where the degree of curing of the pressure-sensitive adhesive is different from each other. An adhesion step of adhering to the adherend 100, and peeling off the adhesive sheet 1 from the adherend 100, selectively leaving a portion of the adhesive composition with a low degree of curing on the adherend 100. In other words, by producing adhesive residue 23, the first information is carried on the adherend 100, and the second information corresponding to the first information is carried on the adhesive sheet 1 peeled from the adherend 100. It is characterized by having a peeling step in which information of the following information is carried.

In this way, a portion of the adhesive composition with a relatively low degree of curing selectively remains on the adherend 100 (in other words, creates adhesive residue 23), so that the adherend 100 A predetermined pattern (first pattern) is formed. On the other hand, the adhesive composition remains on the adherend 100, in other words, a part of the adhesive composition from the adhesive sheet 1 transfers to the adherend 100, so that it is peeled off from the adherend 100. A pattern (second pattern) corresponding to the pattern (first pattern) formed on the adherend 100 is formed on the adhesive sheet 1 .

The adherend 100 on which the first pattern is formed carries the first information, and the adhesive sheet 1 on which the second pattern is formed carries the second information. This pattern carries the second information.

As a result, corresponding patterns can be easily formed on a plurality of members (i.e., the adhesive sheet 1 and the adherend 100) with a simple configuration, and the patterns formed on these members can be used as information. It is possible to provide a method of using a pressure-sensitive adhesive sheet that can be used.

As a result, for example, the management of the plurality of members, the process management of the adherend 100, the physical distribution management, etc. can be suitably performed using the first information and the second information that are the corresponding information.
Each step will be explained below.

<Application process>
In the adhesion process, the adhesive sheet 1 is adhered to the adherend 100. At this time, as shown in FIG. 8, the adhesive sheet 1 is used by being attached to the adherend 100 with the adhesive layer 20 facing each other.

In this step, the adhesive sheet 1 described above can be suitably used. Further, in this step, for example, a tape-shaped adhesive sheet may be used as the adhesive sheet 1. The tape-shaped adhesive sheet 1 can be used by cutting it into a desired length, for example.

At this time, cured portions 21 (crosslinked portions) and non-cured portions 22 (non-crosslinked portions) are arranged in a predetermined pattern in the adhesive layer 20, thereby forming a predetermined pattern.

When the adhesive sheet 1 is stored or when the adhesive sheet 1 is attached to the adherend 100, it is usually difficult to distinguish between the cured portion 21 and the uncured portion 22.

<Peeling process>
In the peeling process, the adhesive sheet 1 is peeled from the adherend 100. At this time, by selectively leaving a portion of the adhesive composition with a low degree of curing on the adherend 100, the first information is carried on the adherend 100, and the adherend The adhesive sheet 1 peeled from the adhesive sheet 100 is made to carry second information corresponding to the first information.

More specifically, as shown in FIGS. 9 and 10, once the adhesive sheet 1 affixed to the adherend 100 is peeled off, the cured portion 21 (crosslinked portion) of the adhesive layer 20 is removed. It peels off cleanly from the adherent 100, and its surface is almost flat. Moreover, there is substantially no residue (glue residue) on the adherend 100 side.

On the other hand, the uncured portion 22 (non-crosslinked portion) is soft, and the stress during peeling causes stringing and cohesive failure within the adhesive layer 20, and a portion of the adhesive is attached to the adherend 100 side. A so-called adhesive residue 23 remains (see FIGS. 9 and 10). In such a case, usually not only a portion of the uncured portion 22 (non-crosslinked portion) remains on the adherend 100 side, but also the adhesive residue 23 (non-crosslinked portion) remaining on the adherend 100 side. The surface is rough.

Therefore, a comparison is made to ensure that a portion of the adhesive layer 20 remains on the adherend 100 (in particular, that the adhesive composition remains in a pattern corresponding to the uncured portion 22 (non-crosslinked portion)). The target can be easily recognized visually.

As described above, the adhesive composition (adhesive residue 23) remaining on the adherend 100 carries the first information.

In addition, by observing not only the side of the adherend 100 but also the side of the adhesive sheet 1 that has been peeled off from the adherend 100, traces of peeling from the adherend 100 can be easily confirmed. More specifically, in the adhesive sheet 1 peeled from the adherend 100, the cured portion 21 (crosslinked portion) maintains a smooth surface, whereas the uncured portion 22 (non-crosslinked portion) ), a portion of the adhesive composition has been removed and at least the surface has become rough. Therefore, after peeling the adhesive sheet 1 from the adherend 100, by observing the adhesive sheet 1 peeled from the adherend 100, it is possible to determine the cured portion 21 (crosslinked portion) and the uncured portion 22 (non-crosslinked portion). patterns can be easily recognized.

As a result, the second information corresponding to the first information is carried on the adhesive sheet 1 peeled from the adherend 100. The first information and the second information are mutually inverted patterns (mirror image patterns) when viewed from the pressure-sensitive adhesive composition side.

<Coloring material adhesion process>
In this embodiment, after the peeling process, the adhesive composition (adhesive residue 23) remaining on the adherend 100 and the adhesive layer 20 of the adhesive sheet 1 peeled from the adherend 100 are further removed. A coloring material adhesion step is included in which a coloring material is selectively adhered to at least one of the areas from which the adhesive composition has not been removed in the in-plane direction of the adhesive sheet 1 .

Thereby, the visibility and identifiability of the first information carried on the adherend 100 and the second information carried on the adhesive sheet 1 can be further improved.

Here, FIG. 11 is a schematic vertical cross-sectional view showing the state in which the adhesive composition remaining on the adherend is colored, and FIG. 12 is the state in which the adhesive sheet peeled from the adherend is colored. FIG.

The coloring material adhesion step may be performed using any method, for example, on at least one of the adherend 100 from which the adhesive sheet 1 has been peeled, and the adhesive sheet 1 which has been peeled from the adherend 100. The adhesive composition remaining on the adherend 100 can be carried out by applying a colored sheet 60 having a colored layer 62 made of a material containing a coloring agent. (adhesive residue 23), and at least a portion of the adhesive layer 20 of the adhesive sheet 1 peeled from the adherend 100 from which the adhesive composition has not been removed in the in-plane direction of the adhesive sheet 1. It is preferable to carry out this by bringing it into contact with one side and then peeling it off.

As a result, the adhesive composition (adhesive residue 23) remaining on the adherend 100 and the adhesive layer 20 of the adhesive sheet 1 peeled from the adherend 100 are removed in the in-plane direction of the adhesive sheet 1. A coloring material can be selectively attached to at least one of the areas from which the adhesive composition has not been removed by a simple method.

Note that the portion of the adhesive layer 20 of the adhesive sheet 1 peeled from the adherend 100 from which the adhesive composition has not been removed in the in-plane direction of the adhesive sheet 1 corresponds to the cured portion 21 .

The colored sheet 60 only needs to have at least a colored layer 62, but usually also includes a colored sheet base material 61 that supports the colored layer 62.

Conditions for the colored sheet base material 61 and the colored layer 62 are appropriately selected depending on the type of the colored sheet 60 and the like.

The colored sheet 60 having the colored layer 62 made of a material containing a coloring agent is not particularly limited as long as the coloring agent can be attached (transferred) to the pressure-sensitive adhesive composition or the surface of the pressure-sensitive adhesive layer 20. Not done. Further, the method of transferring the colorant is not particularly limited, and examples thereof include methods using pressure and heat.

Examples of such a colored sheet 60 include carbon paper and a thermal transfer type ink ribbon.

(carbon paper)
Carbon paper is a thin paper for pressure-sensitive copying that is manufactured by mixing pigments, dyes, and other colored materials (coloring agents) with wax, oil, etc. and coating it on carbon base paper. , used for copying by applying pressure such as pen pressure.

As the colored substance (coloring agent), in the case of black, dyes are used in addition to carbon black and various organic pigments.

The carbon base paper is required to be thin, uniform, pinhole-free, and strong, so for example, paper manufactured by using chemical wood pulp as the main raw material and blending a large amount of cotton or hemp pulp is used.

(ink ribbon)
The ink ribbon is, for example, a thermal transfer type ink ribbon that has a strip-shaped base film and a thermal transfer ink layer provided on one side (single side) of the base film.

Examples of the material for the base film include various plastics and various papers. The thickness of the base film is not particularly limited, but from the viewpoint of improving heat conduction, it is preferably 1 μm or more and 10 μm or less, and more preferably 2 μm or more and 7 μm or less.

The thermal transfer ink layer is generally composed of waxes, resins, colorants, and the like.
As the wax, for example, polyethylene wax (polyethylene wax, oxidized polyethylene wax, etc.) can be suitably used.

As the resin constituting the thermal transfer ink layer, for example, a thermofusible resin is suitably used.

Examples of the hot-melt resin include olefin copolymers such as ethylene-vinyl acetate copolymer and ethylene-acrylic acid ester copolymer, polyamide resin, polyester resin, epoxy resin, polyurethane resin, Acrylic resin, vinyl chloride resin, cellulose resin, vinyl alcohol resin, petroleum resin, phenol resin, styrene resin, vinyl acetate resin, natural rubber, styrene-butadiene rubber, isoprene rubber, chloroprene rubber, etc. Examples include elastomers, polyisobutylene, polybutene, and the like.

Further, as the colorant constituting the thermal transfer ink layer, for example, various pigments and various dyes can be used.

When the colored sheet 60 is a pressure-sensitive type, as shown in FIG. The colored sheet 60 is laminated on the adherend 100.

As a result, the adhesive composition (adhesive residue 23) remaining on the adherend 100 comes into contact with the colored layer 62 of the colored sheet 60.

By applying pressure from the colored sheet 60 side, the pressure is higher in the convex portions, that is, the portions of the adhesive composition (adhesive residue 23) remaining on the adherend 100 than in other portions. Pressure is added. At that location, the colorant contained in the colored layer 62 of the colored sheet 60 is transferred to the pressure-sensitive adhesive composition side.

Thereafter, as shown in FIG. 11(b), by peeling the colored sheet 60 from the adherend 100, the colored sheet 60 is selectively applied to the adhesive composition (adhesive residue 23) remaining on the adherend 100. is attached. Since the target site to which the colored material is transferred is the adhesive composition, the colored material can be more efficiently attached.

Similarly, when coloring the adhesive layer 20 of the adhesive sheet 1 peeled from the adherend 100, first, as shown in FIG. A colored sheet 60 is laminated on the adhesive sheet 1.

By applying pressure from the colored sheet 60 side, in the convex portions, that is, the portions of the adhesive layer 20 of the adhesive sheet 1 in which the adhesive composition is not removed in the in-plane direction of the adhesive sheet 1. , higher pressure is applied compared to other parts. At that location, the colorant contained in the colored layer 62 of the colored sheet 60 is transferred to the pressure-sensitive adhesive composition side.

Thereafter, as shown in FIG. 12(b), by peeling the colored sheet 60 from the adhesive sheet 1, the adhesive composition is removed from the adhesive layer 20 of the adhesive sheet 1 in the in-plane direction of the adhesive sheet 1. The coloring material is selectively attached to areas that are not covered. Since the target site to which the colored material is transferred is the adhesive composition, the colored material can be more efficiently attached.

Similarly, when the colored sheet 60 is of a thermal transfer type, the colored layer 62 is an adhesive composition that remains on the adherend 100 (see FIG. 11(a)) or the adhesive layer 20 of the adhesive sheet 1. The colored sheet 60 is laminated on the adherend 100 or the adhesive sheet 1 so as to face each other (see FIG. 12(a)).

By pressing the colored sheet 60 from the base material side, the convex portion, that is, the adhesive composition (adhesive residue 23) remaining on the adherend 100 or the adhesive layer that the adhesive sheet 1 has In portions of the adhesive sheet 20 from which the adhesive composition has not been removed in the in-plane direction, the colorant contained in the colored layer 62 of the colored sheet 60 is transferred to the adhesive composition side.

Thereafter, by peeling the colored sheet 60 from the adherend 100 or the adhesive sheet 1, the adhesive residue 23 (see FIG. 11(b)) or the adhesive included in the adhesive sheet 1 peeled from the adherend 100 is removed. The coloring material is selectively attached to the portions of the layer 20 in the in-plane direction of the adhesive sheet 1 from which the adhesive composition has not been removed (see FIG. 12(b)). Since the target site to which the colored material is transferred is the adhesive composition, the colored material can be more efficiently attached.

Note that the colored layer 62 of the colored sheet 60 may contain a fluorescent agent. By attaching a coloring material containing a fluorescent agent, the area to which the coloring material has been transferred will emit light when irradiated with black light (ultraviolet A rays with a wavelength of 315 nm or more and 400 nm or less), even if it does not appear to be colored at first glance. , easily visible.

In this way, the visibility and identifiability of the first information and the second information can be further improved.

Preferably, the first information and the second information are one-dimensional codes or two-dimensional codes.

Thereby, the information density per area of the first information and the second information can be increased.

The first information and the second information are used for various types of management, such as (a) parts management and process management at the production site, (b) logistics management, and (c) management at the distribution stage (inspection, inventory, etc.) , (d) Management at the sales stage (register payment, bulk payment for multiple products, etc.), (e) Management at the disposal/recycling stage, (f) Payment/loan management (automatic payment at the cafeteria, payment at the library, etc.) (book management, etc.), (g) Provision of product/product information (provision of traceability information, provision of work information, digitization of posters, etc.), (h) Safety management/crime prevention (best-before date management, theft prevention/shoplifting prevention) etc.), (i) authenticity determination/brand identification, (j) medical accident prevention, (k) animal management, etc.

In particular, it is preferable that the first information and the second information be used for at least one of process management and logistics management.

This allows process management and logistics management to be performed more efficiently. In particular, in process management and logistics management, it is necessary to ensure that attached information is retained, and it is also necessary to ensure that the attached information does not make the object larger or more difficult to handle. Although there is a strong demand for this, the present invention can satisfy such a demand at a high level. That is, when the first information and the second information are used for at least one of process management and distribution management, the effects of the present invention are more significantly exhibited.

"Process control" is the management of producing a given product in a given quantity, at a given quality, at a given cost, and delivered on a given delivery date. It is a management activity to efficiently utilize the labor force of employees. Proper process management can improve work efficiency, reduce costs, and prevent delivery delays. Additionally, by keeping quality and productivity constant, customer satisfaction can be expected to increase.

In process control, the adhesive sheet 1 can be used, for example, as a label for checking that each process has been completed in a factory production line that goes through a plurality of processes. For example, an information pattern indicating the end of a process is formed on a label (adhesive sheet 1), and the label is affixed to the manufactured product (adherent 100). By peeling off the label after a predetermined process is completed, the manufactured product carries information on the completion of the process as first information, and the label also carries second information corresponding to the first information. carried. The peeled label is stored as a control slip.

In addition, "logistics" refers to a series of activities (physical movement) from the time a product is produced until it is delivered to a customer, including transportation, storage, packaging, cargo handling, distribution processing, information support, etc. It is configured. "Logistics management" is the management activity to deliver the products requested by customers in the right quality, in the right quantity, at the right time (delivery date), to the right place, and at the right price. .

In logistics management, the adhesive sheet 1 can be used, for example, as a label for recording import/export and transaction management in intermediate processors, intermediate wholesalers, etc., and as a label for delivery management in delivery companies.

As an example of the above physical distribution management, a case where the adhesive sheet 1 is used as a shipping label will be described.

For example, when delivering an item, the delivery company will package the item (product) in packaging materials such as cardboard, paper boxes, or plastic boxes, and will include information such as the address, name, or name of the source and destination of the item. A shipping label with information printed on it is attached to the surface of the packaging material, and based on this information, the item is delivered to the purchaser.

Such a shipping label, for example, has a delivery slip and a pasting tag, each of which has the above-mentioned delivery information printed on it, and is pasted onto the delivery item using an adhesive applied to the back side. and used. After the delivery item is delivered to the delivery destination, the delivery slip among the delivery labels attached to the delivery item is separated from the delivery label. The separated delivery slip will be kept by the delivery company as proof of completion of the take-home delivery.

For example, a pattern representing a code (numbers, barcode, QR code (registered trademark), etc.) for delivery management (delivery status tracking, etc.) is formed on the shipping label (adhesive sheet 1), and the packaging material (adhesive sheet 1) After pasting the shipping label (adhesive sheet 1) on the body 100), by peeling the shipping label from the packaging material, the packaging material side carries the above-mentioned code as the first information, and the shipping label side also carries the first information. Second information corresponding to the first information will be carried.

Even if the delivery person separates the delivery label and takes it home after the delivery is complete, or if the shipping label is peeled off from the packaging material for some reason during delivery, the packaging material and delivery label should correspond to each other. Since it carries information, it is possible to manage and track it based on this information.
This makes it possible to further reduce risks such as misdelivery and delivery delays.

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

For example, the adhesive sheet according to the present invention may further include configurations other than those described above. For example, the pressure-sensitive adhesive sheet according to the present invention may include a coat layer (for example, a printing coat layer, etc.) or an intermediate layer.

Hereinafter, the present invention will be explained in detail based on specific examples, but the present invention is not limited thereto. In the following examples, treatments and measurements that do not indicate temperature conditions were performed at room temperature (23° C.).

[Manufacture of adhesive sheet]
(Example 1)
First, a 50 μm thick film made of polyethylene terephthalate (manufactured by Toyobo Co., Ltd., trade name “Cosmoshine (registered trademark) A4300”) was prepared as a base material. The transmittance of ultraviolet C waves for the base material was 0.5% or less.

An ultraviolet C wave curable hot melt adhesive composition was applied to one side of this base material using a hot melt coating machine to form an adhesive composition layer with a thickness of 25 μm. A base material was obtained. Further, as the ultraviolet C wave curable hot melt adhesive composition, a benzophenone group-containing acrylic hot melt adhesive composition manufactured by BASF, trade name "acResin (registered trademark)" was used.

Next, the liner body was laminated onto the pressure-sensitive adhesive composition layer of the base material with the pressure-sensitive adhesive composition layer. As the liner body, a polypropylene film (thickness: 38 μm) whose surface in contact with the adhesive composition layer was subjected to a release treatment was used. The ultraviolet C wave transmittance of the liner body was 70% or more.

Next, a printed layer is formed in a predetermined pattern on the outer surface (the surface opposite to the surface facing the adhesive layer) of the liner body, and a release liner in which the printed layer is provided on the liner body is obtained. A laminate was obtained in which a release liner, an adhesive composition layer, and a base material were laminated in this order. The printing layer was formed using Flexiproof 100 manufactured by RK Print Coat Instruments, and UV161 ink manufactured by T&K TOKA as the ink.

Next, using a high-pressure mercury lamp (manufactured by Eye Graphics, Eye Grantage ECS-4011GX) as an ultraviolet irradiation device, the irradiation intensity was 48 mW/cm ² and the cumulative light amount was 60 mJ/cm ² from the release liner side of the laminate. A pressure-sensitive adhesive sheet was obtained by curing the printed layer and partially curing the pressure-sensitive adhesive composition layer by irradiating it with a light beam containing ultraviolet C waves under the following conditions. At this time, non-cured portions were formed in the adhesive layer corresponding to the pattern of the printed layer, and other portions became cured portions. In addition, the transmittance of ultraviolet C waves for the printed layer was 0.5% or less. Further, the thickness of the printed layer was 2 μm.

(Example 2)
First, a 50 μm thick film made of polypropylene was prepared as a base material body. The transmittance of ultraviolet C waves for the base material body was 70% or more.

An ultraviolet C wave curable hot melt adhesive composition is coated on one side of the base material body using a hot melt coating machine to form a 25 μm thick adhesive composition layer, and the adhesive A release liner was attached to the surface of the agent composition layer. As the ultraviolet C wave curable hot melt adhesive composition, a benzophenone group-containing acrylic hot melt adhesive composition manufactured by BASF under the trade name "acResin (registered trademark)" was used. Further, as a release liner, a polyethylene terephthalate film (thickness: 38 μm) whose surface in contact with the adhesive composition layer was subjected to a release treatment was used.

Next, a printed layer is formed in a predetermined pattern on the outer surface (the surface opposite to the surface facing the adhesive composition layer) of the base material body, and the base material with the printed layer provided on the base material body is A laminate was obtained in which the base material, the adhesive composition layer, and the release liner were laminated in this order. The printing layer was formed using Flexiproof 100 manufactured by RK Print Coat Instruments, and UV161 ink manufactured by T&K TOKA as the ink.

Next, using a high-pressure mercury lamp (manufactured by Eye Graphics, Eye Grantage ECS-4011GX) as an ultraviolet irradiation device, the irradiation intensity was 48 mW/cm ² and the cumulative light amount was 60 mJ/cm ² from the base material side of the laminate. A pressure-sensitive adhesive sheet was obtained by curing the printed layer and partially curing the pressure-sensitive adhesive composition layer by irradiating it with a light beam containing ultraviolet C waves under the following conditions. At this time, non-cured portions were formed in the adhesive layer corresponding to the pattern of the printed layer, and other portions became cured portions. In addition, the transmittance of ultraviolet C waves for the printed layer was 0.5% or less. Further, the thickness of the printed layer was 2 μm.

[evaluation]
First, the release liner was peeled off from the pressure-sensitive adhesive sheets produced in each of the Examples. Both the cured and uncured parts of the adhesive layer were substantially transparent and could not be visually distinguished.

Next, the exposed adhesive layer was placed facing a glass plate serving as an adherend, and was attached to the adherend by applying a load by making one reciprocation with a 2 kg roll, and left in an environment of 23°C for 1 hour. I left it still.
Thereafter, the adhesive sheet was carefully peeled off from the adherend.

When the adherend was observed after the adhesive sheet was peeled off, the adhesive composition remained in a pattern corresponding to the uncured portion of the adhesive layer, resulting in adhesive residue. In other words, the first information was attached to the adherend from which the adhesive sheet was peeled off.

Furthermore, when we observed the adhesive layer of the adhesive sheet that had been peeled off, we found that the cured part of the adhesive layer could be peeled off cleanly from the adherend without any adhesive residue, and the surface of the cured part was almost flat. On the other hand, in the non-cured portion, adhesive remained on the adherend, and the surface of the non-cured portion was greatly roughened. The cured portion maintained its transparency, but the uncured portion appeared opaque (cloudy) due to diffuse reflection of light on the surface. In other words, the second information was given to the adhesive sheet after it was peeled off from the adherend.

[Coloring evaluation]
Furthermore, the adhesive composition (adhesive residue) remaining on the adherend was colored in the following manner.

A melt-type thermal transfer ink ribbon (manufactured by Dai Nippon Printing Co., Ltd., R300) as a colored sheet material was laminated on the adherend with adhesive residue, with the colored layer side facing the adhesive composition, and the layer was laminated with a 2 kg roll. A load was applied to the entire body by moving it back and forth.

When the melt-type thermal transfer ink ribbon was peeled off from the adherend, the coloring agent was transferred to the surface of the adhesive composition remaining on the adherend, and the ribbon was colored black. Thereby, the pattern (first information) of the adhesive composition remaining on the adherend could be more easily recognized.

Further, the adhesive layer of the adhesive sheet peeled from the adherend was also colored in the same manner. As a result, the coloring agent was transferred to the surface of the adhesive layer where the adhesive composition had not been removed in the in-plane direction of the adhesive sheet, and the area was colored black. This made it possible to more easily recognize the pattern (second information) in which part of the adhesive composition was removed from the adhesive layer.

In addition, as a laminate, after coating an ultraviolet C wave-curable hot melt adhesive composition on one side of the liner body to form an adhesive composition layer, a base material is applied on the adhesive composition layer. A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 above, except that a pressure-sensitive adhesive sheet was produced by laminating the liner and then forming a printed layer on the outer surface of the liner body, and evaluation was carried out in the same manner as above. When this was done, the same results as above were obtained.

In addition, as a laminate, after coating an ultraviolet C wave-curable hot melt adhesive composition on one side of a release liner to form an adhesive composition layer, a base material is coated on the adhesive composition layer. A pressure-sensitive adhesive sheet was produced in the same manner as in Example 2 above, except that a pressure-sensitive adhesive sheet was produced by bonding the main bodies together and then forming a printing layer on the outer surface of the base material main body. When the evaluation was performed, the same results as above were obtained.

1... Adhesive sheet 10... Base material 11... Base material body 12... Print layer 20... Adhesive layer 20'... Adhesive composition layer 21... Cured portion (crosslinked portion)
22...Uncured portion (non-crosslinked portion)
23... Adhesive residue 30... Release liner 31... Liner body 32... Print layer 50... Laminate 60... Colored sheet 61... Colored sheet base material 62... Colored layer 100... Adherent 200... Light source

Claims (6)

A pressure-sensitive adhesive sheet comprising a base material and a pressure-sensitive adhesive layer made of a pressure-sensitive adhesive composition containing a pressure-sensitive adhesive,
The adhesive layer has regions where the degree of curing of the adhesive differs from each other,
After the adhesive sheet is attached to an adherend, when it is peeled off from the adherend, a portion of the adhesive composition with a low degree of curing of the adhesive is selectively applied onto the adherend. By causing the information to remain, the first information is carried on the adherend, and the adhesive sheet peeled from the adherend is made to carry second information corresponding to the first information. An adhesive sheet characterized by: The adhesive sheet according to claim 1, wherein the first information and the second information are one-dimensional codes or two-dimensional codes. The pressure-sensitive adhesive sheet according to claim 1 or 2, wherein the first information and the second information are used for at least one of process management and logistics management. an adhesion step of adhering to an adherend a pressure-sensitive adhesive sheet comprising a base material and a pressure-sensitive adhesive layer comprising a pressure-sensitive adhesive composition containing a pressure-sensitive adhesive and having portions where the degree of curing of the pressure-sensitive adhesive differs from each other;
By peeling off the adhesive sheet from the adherend and selectively leaving a portion of the adhesive composition with a low degree of curing on the adherend, the adhesive sheet is removed from the adherend. A method of using a pressure-sensitive adhesive sheet, the method comprising: carrying first information and a peeling step of causing the pressure-sensitive adhesive sheet peeled from the adherend to carry second information corresponding to the first information. . 5. The method of using an adhesive sheet according to claim 4, wherein the first information and the second information are one-dimensional codes or two-dimensional codes. 6. The method of using a pressure-sensitive adhesive sheet according to claim 4, wherein the first information and the second information are used for at least one of process control and logistics control.

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