JP2019172938A - Manufacturing method of pressure sensitive adhesive sheet - Google Patents

Abstract

To provide a manufacturing method of a pressure sensitive adhesive sheet capable of preventing peeling of a printed layer without going through a complicated process, and without loss of a release liner, when producing a release sheet-attached label, a sticker or the like.SOLUTION: A manufacturing method of a pressure sensitive adhesive sheet has steps of: forming a printed layer 11 by printing on a release liner 10; forming an adhesive layer 21 on a surface where the printed layer 11 is formed, of the release liner 10; and bonding a light-permeable substrate 20 on a surface on the opposite side to the release liner 10 of the adhesive layer 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for producing an adhesive sheet.

  Conventionally, when producing labels or stickers with a release sheet, for example, as shown in FIG. 4, offset printing or gravure printing is performed on the surface of the base material 30 provided with the adhesive layer 32 and the release liner 33 on the back surface. In addition, a method of forming a print layer 31 by performing printing by various methods is used.

  In recent years, with the spread of computer utilization technology, it has become frequent to print out characters and images created by a computer using various printers. Along with this, printed materials that have been subjected to on-demand printing on the substrate surface by an inkjet method or the like have begun to be used in various applications. In this case, the printed substrate is used in various applications, for example, in the display field such as stickers and labels, and public notices.

  However, a label formed by such printing has a problem that the printed layer is scraped or peeled off due to rubbing during use or carrying, and other external forces.

  On the other hand, a label manufacturing method that suppresses peeling or character damage during use has been proposed (see, for example, Patent Document 1).

  For example, first, reverse printing for a label is performed on one surface of a light-transmitting substrate 30 by a predetermined printing method to form a printing layer 31. Then, as shown in FIG. 5B, one release liner 33 of the sheet having release liners 33 provided on both sides of the pressure-sensitive adhesive layer 32 is peeled off, and the pressure-sensitive adhesive layer 32 is printed on the substrate 30. It is bonded to the surface on which the layer 31 is formed.

  For example, as shown in FIG. 6A, first, an adhesive layer 32 is formed on one surface of a light-transmitting substrate 30, and the substrate 30 of the adhesive layer 32 is disposed. The reverse character printing for the label is performed on the surface opposite to the side surface by a predetermined printing method to form the print layer 31. And as shown in FIG.6 (b), the peeling liner 33 is bonded together to the surface by which the printed layer 31 of the base material 30 of the adhesive layer 32 was formed.

  The label produced in this manner is peeled off the release liner 33 and attached to the adherend via the adhesive layer 32. By sticking the label in this way, information printed with reverse characters on the label can be read as a normal character from the outside through the light-transmitting substrate 30 of the label.

  However, these methods require printing with reverse characters in which characters and patterns are reversed, and thus the process is complicated. In particular, the former method requires a sheet provided with a release liner on both sides of the pressure-sensitive adhesive layer, leading to a loss of the release liner. In the latter method, there is a problem of printing defects because printing is performed on the adhesive surface.

JP-A-2005-241818

  The objective of this invention is providing the manufacturing method of the adhesive sheet which prevented peeling of the printing layer, without passing through a complicated process and without the loss of a release liner.

Such an object is achieved by the present invention described in the following (1) to (7).
(1) a step of printing on a release liner to form a printed layer;
Forming a pressure-sensitive adhesive layer on the surface of the release liner on which the printing layer is formed;
Bonding a base material having optical transparency on a surface of the pressure-sensitive adhesive layer opposite to the release liner;
The manufacturing method of the adhesive sheet characterized by having.

(2) a step of printing on a release liner to form a printed layer;
A step of bringing a sheet material having a light-transmitting base material and a pressure-sensitive adhesive layer provided on one surface side of the base material into contact with the print layer of the release liner from the surface of the pressure-sensitive adhesive layer; The manufacturing method of the adhesive sheet characterized by having.

  (3) The said release liner is a manufacturing method of the adhesive sheet as described in said (2) which is joined to the said adhesive layer before the said printing layer is formed.

(4) The printing step is a step of performing printing using ink,
The adhesive sheet manufacturing method according to any one of (1) to (3), wherein the adhesiveness between the release liner and the ink is lower than the adhesiveness between the adhesive layer and the ink.

  (5) The method for producing a pressure-sensitive adhesive sheet according to any one of (1) to (4), wherein the maximum thickness of the printing layer is 0.1 μm or more and 30 μm or less.

  (6) The ratio of the area of the printing layer to the area of the pressure-sensitive adhesive layer in a plan view of the pressure-sensitive adhesive sheet is 0.1% or more and 90% or less, according to any one of the above (1) to (5). A method for producing an adhesive sheet.

  (7) The manufacturing method of the adhesive sheet in any one of said (1) thru | or (6) which further has the process of raising the crosslinking degree of the said adhesive layer.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the adhesive sheet which prevented that the printing layer peeled can be provided.

It is a typical longitudinal section showing an example of 1 composition of an adhesive sheet manufactured by a manufacturing method of an adhesive sheet of the present invention. It is a typical longitudinal cross-sectional view which shows suitable embodiment (1st Embodiment) of the manufacturing method of the adhesive sheet of this invention. It is a typical longitudinal cross-sectional view which shows suitable embodiment (2nd Embodiment) of the manufacturing method of the adhesive sheet of this invention. It is a typical longitudinal cross-sectional view which shows one structural example of the adhesive sheet manufactured by the manufacturing method of the conventional adhesive sheet. It is a typical longitudinal cross-sectional view which shows the manufacturing method of the conventional adhesive sheet. It is a typical longitudinal cross-sectional view which shows the manufacturing method of the conventional adhesive sheet.

Hereinafter, preferred embodiments of the present invention will be described in detail.
<< First Embodiment >>
Drawing 1 is a typical longitudinal section showing an embodiment of an adhesive sheet manufactured by a manufacturing method of an adhesive sheet of the present invention. Moreover, FIG. 2 is a schematic longitudinal cross-sectional view which shows suitable embodiment of the manufacturing method of the adhesive sheet of this invention.

  As shown in FIG. 1, the pressure-sensitive adhesive sheet 1 manufactured by the manufacturing method of the present embodiment includes a release liner 10, a print layer 11 formed on one surface of the release liner 10, and a print layer of the release liner 10. 11 and the adhesive layer 21 formed on the surface on which the adhesive layer 11 is formed, and the light-transmitting base material 20 bonded to the surface of the adhesive layer 21 opposite to the release liner 10.

  As shown in FIG. 2, the method for manufacturing the pressure-sensitive adhesive sheet 1 includes the step of printing on the release liner 10 to form the print layer 11 (FIG. 2A), and the formation of the print layer 11 of the release liner 10. The step of forming the pressure-sensitive adhesive layer 21 on the finished surface (FIG. 2B) and the step of bonding the light-transmitting substrate 20 on the surface of the pressure-sensitive adhesive layer 21 opposite to the release liner 10 (FIG. 2C).

  In the present invention, the print layer 11 is formed on the release liner 10, the pressure-sensitive adhesive layer 21 is formed on the release liner 10 and the print layer 11, and the transparent base material 20 is bonded onto the pressure-sensitive adhesive layer 21. ing. In use, the release liner 10 is peeled off from the pressure-sensitive adhesive layer 21, and the pressure-sensitive adhesive layer 21 is attached to (attached to) the substrate 40 (FIG. 2D). 10 is peeled off from the release liner 10 side by the pressure-sensitive adhesive layer 21 and transferred to the substrate 20 side, and the observer passes through the substrate 20 having transparency to print layer 11. Therefore, the printed layer 11 formed on the release liner 10 is recognized as it is (without being inverted), that is, when printing on the release liner 10, characters, images, etc. are recognized. Since it is not necessary to invert and print, it is possible to cope with front printing.Because the printing layer 11 is not exposed to the outside and is covered with the adhesive layer 21 and the base material 20, the printing layer 11 can be scraped off. Prevent peeling It by observing from. Substrate 20 side, the thickness effect of the substrate 20, the printing layer 11 can be improved the design of giving a stereoscopic effect.

Hereinafter, each step will be described in detail.
(1) Printing is performed on the release liner 10 to form the print layer 11 (see FIG. 2A).
The printing step is a step of performing printing using ink, and is a step of forming the printing layer 11 by performing printing using ink on the surface of the release liner 10 on which the peeling treatment has been performed.

<Release liner>
The release liner 10 is not particularly limited, and a known release liner used as a release liner for pressure-sensitive adhesive sheets can be appropriately selected and used. In general, the release liner 10 includes a release substrate that has been subjected to a release treatment on one side.

(Peeling substrate)
Examples of the release substrate that can be used for the release liner 10 include polyester films such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, polyolefin films such as polyethylene, polypropylene, and polymethylpentene, fine paper, glassine paper, Examples thereof include paper base materials such as kraft paper, and sheets such as laminated paper obtained by laminating a thermoplastic resin such as polyethylene on these paper base materials.

(Release treatment agent)
In addition, as the release treatment agent for performing the release treatment, a known release treatment agent can be used without particular limitation as long as the printing layer 11 can be appropriately formed on the surface thereof, From the viewpoint that the printed layer 11 does not repel, olefin resins, isoprene resins, butadiene resins, long chain alkyl resins, and alkyd resins are preferable, and butadiene resins and alkyd resins are more preferable.

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

<Printing method>
Further, the printing method employed in the present embodiment is not particularly limited as long as the printing layer 11 can be appropriately formed on the release liner 10 and then the printing layer 11 can be appropriately peeled off. Specifically, for example, letter press printing (letter printing), flexographic printing, offset printing, gravure printing, screen printing, ink jet printing, and the like can be suitably employed.

  The adhesion N1 between the release liner 10 and the ink (printing layer 11) may be lower than the adhesion N2 between the pressure-sensitive adhesive layer 21 formed on the printing layer 11 in a later step and the ink (printing layer 11). preferable. That is, N2> N1.

  Thus, when the release liner 10 is peeled from the pressure-sensitive adhesive layer 21 in the subsequent step (5), the ink (printing layer 11) formed on the release liner 10 is peeled off from the release liner 10 and the pressure-sensitive adhesive layer. 21 can be appropriately transferred.

  The maximum thickness of the printing layer 11 is preferably 0.1 μm or more and 30 μm or less, and more preferably 0.5 μm or more and 5 or less.

  If the thickness of the printing layer 11 is less than 0.1 μm, the printed portion may be thin and visibility may not be sufficient. On the other hand, when the thickness of the printing layer 11 exceeds 30 μm, it is not completely transferred when transferred from the release liner 10 to the pressure-sensitive adhesive layer 21 in a later step, and a part of the printing layer 11 remains on the release liner 10. There is a risk. By setting the maximum thickness of the printing layer 11 within the above range, both sufficient visibility of the printing layer 11 and good transferability can be achieved.

  (2) The pressure-sensitive adhesive layer 21 is formed on the surface of the release liner 10 on which the printing layer 11 is formed (see FIG. 2B).

  The pressure-sensitive adhesive layer 21 is formed by applying a coating liquid containing a pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer 21 on the surface of the release liner 10 on which the printing layer 11 is formed.

  A method for applying the coating liquid is not particularly limited, and a normal method can be used. For example, the coating liquid can be formed by a knife method, a die method, a curtain method, a gravure method, or the like.

<Adhesive>
The pressure-sensitive adhesive layer 21 is a layer for transferring the printing layer 11 formed on the release liner 10 to the substrate 20. Moreover, when using the adhesive sheet 1, it becomes a layer for sticking this adhesive sheet 1 to the to-be-adhered body 40. FIG. When using the adhesive sheet 1 as a transparent label, it is preferable that the adhesive layer 21 is also transparent.

  The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 21 can peel the printed layer 11 formed on the release liner 10 and can leave the printed layer 11 on the glue surface (the surface of the pressure-sensitive adhesive layer 21). There is no particular limitation. Examples of the pressure-sensitive adhesive include acrylic pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, polyester-based, silicone-based pressure-sensitive adhesives, and polyvinyl ether-based pressure-sensitive adhesives. Among these, the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 21 is preferably at least one selected from the group consisting of an acrylic pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, and a rubber-based pressure-sensitive adhesive. Therefore, it is more preferable that the pressure-sensitive adhesive layer 21 contains an acrylic pressure-sensitive adhesive. The pressure-sensitive adhesive may be any of an emulsion type, a solvent type, and a solventless type.

  As an acrylic adhesive, as a main component, for example, an acrylic ester homopolymer, a copolymer containing two or more types of acrylic ester units, and a copolymer of an acrylic ester and another functional monomer Those containing at least one selected from the above (hereinafter also simply referred to as “acrylic polymer”) are used.

  Acrylic pressure-sensitive adhesives are generally roughly classified into solvent types and emulsion types. Solvent types are usually the above-mentioned acrylic polymers, solvents, cross-linking agents, and tackifiers, plasticizers, antistatic agents, and the like used as desired. It is composed of an ultraviolet absorber and the like, and methylol group condensation, ionic crosslinking, urethane crosslinking, epoxy crosslinking and the like are used as a crosslinking system. On the other hand, the emulsion type is usually composed of the acrylic polymer, an emulsifier, an aqueous solvent, a tackifier used as desired, and the like.

  The pressure-sensitive adhesive composition for forming such a pressure-sensitive adhesive layer 21 may be either a crosslinked type that undergoes a crosslinking treatment or a non-crosslinked type that does not undergo a crosslinking treatment. More preferred. When the cross-linked type is used, the pressure-sensitive adhesive layer 21 having a better cohesive force can be formed.

  Examples of the crosslinking agent used in the crosslinking adhesive composition include an epoxy compound, an isocyanate compound, a metal chelate compound, a metal alkoxide, a metal salt, an amine compound, a hydrazine compound, and an aldehyde compound.

The thickness of the pressure-sensitive adhesive layer 21 needs to be at least thicker than the maximum thickness of the printing layer 11, is preferably 1 μm or more and 200 μm or less, more preferably 5 μm or more and 100 μm or less, and more preferably 10 μm or more and 30 μm or less. It is particularly preferred that
By setting the thickness of the pressure-sensitive adhesive layer 21 within the above range, the printing layer 11 can be appropriately transferred from the release liner 10 side to the base material 20 side, and handling properties at the time of sticking can be improved.

  (3) The base material 20 which has a light transmittance is joined on the surface on the opposite side to the peeling liner 10 of the adhesive layer 21 (refer FIG.2 (c)).

<Base material>
The base material 20 becomes a support body which supports the printing layer 11 and the adhesive layer 21 in the adhesive sheet 1 finally obtained.

  The material constituting the substrate 20 is not particularly limited as long as it has optical transparency. For example, polyester such as polyethylene terephthalate, polyolefin such as polyethylene and polypropylene, polyvinyl chloride, polycarbonate, (meth) Examples thereof include resins such as acrylic resin, polystyrene, and cellulose acetate. From the viewpoint of excellent light transmittance, polyester, polyolefin, polyvinyl chloride, and the like are preferable, and polyethylene terephthalate (PET) is more preferable.

  In this specification, (meth) acrylic resin means acrylic resin and methacrylic resin.

  The thickness of the base material 20 is preferably 10 μm or more and 300 μm or less, and more preferably 20 μm or more and 80 μm or less.

  When observing the printing layer 11 through the base material 20, the three-dimensional effect can be given to the printing layer 11 and the designability can be improved by the thickness effect.

  In the case of using the substrate 20 made of a resin, surface treatment can be performed by an oxidation method, a concavo-convex method or the like for the purpose of improving the adhesion with the pressure-sensitive adhesive layer 21 to be bonded. Examples of the oxidation method include corona discharge treatment, chromic acid treatment (wet), flame treatment, hot air treatment, ozone / ultraviolet irradiation treatment, and the like. Is mentioned. These surface treatment methods are appropriately selected according to the material constituting the base material 20, but in general, the corona discharge treatment method is preferably used from the viewpoints of effects and operability. Moreover, primer treatment can also be performed.

(4) The degree of crosslinking of the pressure-sensitive adhesive layer 21 is increased.
Then, you may have further the process of raising the crosslinking degree of the adhesive layer 21. FIG.

  Thereby, the adhesiveness N2 between the pressure-sensitive adhesive layer 21 and the ink (printing layer 11) can be further increased, and when the release liner 10 is peeled from the pressure-sensitive adhesive layer 21 in the subsequent step (5), the release liner 10 The ink (printing layer 11) formed thereon can be peeled off from the release liner 10 and reliably transferred by the pressure-sensitive adhesive layer 21 (base material 20 side).

  Examples of a method for increasing the degree of crosslinking of the pressure-sensitive adhesive layer 21 include heating and irradiation with ultraviolet rays according to the types of the resin and the cross-linking agent constituting the pressure-sensitive adhesive layer 21. When a resin that cures and cures by ultraviolet rays (ultraviolet curable resin) is used, the degree of crosslinking can be easily adjusted by changing the irradiation amount of ultraviolet rays, and a crosslinked resin having a high crosslinking density can be formed. it can.

The degree of crosslinking of the pressure-sensitive adhesive layer 21 varies depending on various conditions such as the type and composition of the pressure-sensitive adhesive (adhesive composition), and is not particularly limited, but is usually 20% by weight to 80% by weight in terms of sol-gel fraction. It is preferable to be 30% by weight or more and 60% by weight or less. If the degree of crosslinking is too high, gelation may occur, which is not preferable for forming the pressure-sensitive adhesive layer 21. On the other hand, when the degree of crosslinking is too low, the pressure-sensitive adhesive layer 21 becomes soft and sufficient adhesive force cannot be imparted.
The degree of crosslinking of the pressure-sensitive adhesive layer 21 can be adjusted, for example, by selecting the composition and molecular weight of the base polymer, whether or not the crosslinking agent is used, its type, and the amount used.

  The pressure-sensitive adhesive sheet 1 is manufactured through the steps (1) to (4). And since the observer of the adhesive sheet 1 will visually recognize the printing layer 11 through the base material 20 which has transparency, the printing layer 11 formed on the peeling liner 10 is in a state as it is (it is not reversed). You will recognize. That is, when printing on the release liner 10, it is not necessary to reverse characters and images. Moreover, since the printing layer 11 is not exposed to the outside and is covered with the pressure-sensitive adhesive layer 21 and the base material 20, it is possible to prevent the printing layer 11 from being scraped off or peeled off.

  In plan view of the pressure-sensitive adhesive sheet 1 obtained by the method of the present embodiment, the ratio of the area of the printing layer 11 to the area of the pressure-sensitive adhesive layer 21 is preferably 0.1% or more and 90% or less, and preferably 1% or more and 50%. % Or less is more preferable.

  If the area ratio of the print layer 11 is less than 0.1%, the ratio of the print layer 11 is too small, and there is a possibility that the printed content cannot be fully recognized. On the other hand, when the area ratio of the print layer 11 exceeds 90%, the ratio of the print layer 11 increases, and there is a possibility that the transfer of the print layer 11 from the release liner 10 side to the substrate 20 side may not be performed well. Moreover, since the ratio of the adhesive layer 21 becomes low, there is a possibility that sufficient adhesiveness as an adhesive sheet cannot be realized when adhering to the adherend 40. By setting the ratio of the area of the printing layer 11 to the area of the pressure-sensitive adhesive layer 21 in a plan view of the pressure-sensitive adhesive sheet 1 within the above range, sufficient visibility of the printed content, the release liner 10 side of the printing layer 11 to the substrate 20 side It is possible to achieve good transfer to the adhesive and sufficient adhesiveness as an adhesive sheet.

(5) The release liner 10 is peeled from the pressure-sensitive adhesive layer 21 (see FIG. 2D).
At the time of use of the pressure-sensitive adhesive sheet 1, the release liner 10 is peeled off from the pressure-sensitive adhesive layer 21, and the pressure-sensitive adhesive layer 21 is pasted (attached) to face the adherend 40. At this time, the printing layer 11 formed on the release liner 10 is peeled off from the release liner 10 side by the pressure-sensitive adhesive layer 21 and transferred to the substrate 20 side.

  At this time, the adhesion N1 between the release liner 10 and the ink (printing layer 11) is lower than the adhesion N2 between the pressure-sensitive adhesive layer 21 and the ink (printing layer 11) (N2> N1). When the release liner 10 is peeled from the adhesive layer 21, the ink (printing layer 11) formed on the release liner 10 is peeled off from the release liner 10 and reliably transferred to the pressure-sensitive adhesive layer 21 (base material 20 side). can do.

<< Second Embodiment >>
Below, 2nd Embodiment of the manufacturing method of the adhesive sheet 1 of this invention is described.

  FIG. 3 is a schematic longitudinal sectional view showing a preferred embodiment (second embodiment) of the method for producing the pressure-sensitive adhesive sheet 1 of the present invention.

  In the following description, portions that are different from the first embodiment described above will be mainly described, and descriptions of portions that are common to the first embodiment will be omitted.

  The manufacturing method of the adhesive sheet 1 of this embodiment is provided on the one surface side of the base material 20 which has the process of printing on the peeling liner 10, and forming the printing layer 11, the base material 20 which has light transmittance. And a step of bringing the sheet material 2 having the adhesive layer 21 into contact with the printed layer 11 of the release liner 10 from the surface of the adhesive layer 21.

  In 1st Embodiment mentioned above, although the adhesive layer 21 was formed on the release liner 10 in which the printing layer 11 was formed, in this embodiment, the adhesive layer 21 is formed on the base material 20, It is bonded onto the release liner 10 on which the printing layer 11 is formed.

Hereinafter, each step will be described in detail.
(1) The pressure-sensitive adhesive layer 21 is formed on one surface side of the light-transmitting base material 20 to form the sheet material 2 (see FIG. 3A).

  The pressure-sensitive adhesive layer 21 is formed by applying a coating liquid containing a pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer 21 on one surface side of the substrate 20.

  As the method for applying the pressure-sensitive adhesive composition and the coating liquid onto the substrate 20, the same materials and methods as those in the first embodiment described above can be used.

  In the production of the sheet material 2 of (1), the release liner 10 may be disposed on the surface of the pressure-sensitive adhesive layer 21 opposite to the side on which the base material 20 is disposed.

(2) Printing is performed on the release liner 10 to form the print layer 11 (see FIG. 3C).
On the surface of the release liner 10 that has been subjected to the release treatment, printing is performed using ink to form the print layer 11.

  The release liner 10, the ink, and the printing method can all use the same material and method as in the first embodiment.

  Here, as shown in FIG. 3B, the release liner 10 on which the printing layer 11 is formed in (2) was joined to the adhesive layer 21 of the sheet material before the printing layer 11 was formed. It is preferable. That is, the release liner 10 is peeled from the pressure-sensitive adhesive layer 21 in the sheet material 2 (see FIG. 3B), and printing is performed on the peeled release liner 10 (see FIG. 3C).

  At this time, the adhesion N1 between the release liner 10 and the ink (printing layer 11) is lower than the adhesion N2 between the pressure-sensitive adhesive layer 21 that is in contact with the printing layer 11 and the ink (printing layer 11). preferable. That is, N2> N1.

  Thus, when the release liner 10 is peeled from the pressure-sensitive adhesive layer 21 in the subsequent step (4), the ink (printing layer 11) formed on the release liner 10 is peeled off from the release liner 10 and the pressure-sensitive adhesive layer. 21 (base material 20 side) can be appropriately transferred.

(3) The sheet material 2 is brought into contact with the printed layer 11 of the release liner 10 from the surface of the pressure-sensitive adhesive layer 21 (see FIG. 3D).

  The sheet material 2 is bonded to the surface of the release liner 10 on which the printing layer 11 is formed, with the surface on the side where the pressure-sensitive adhesive layer 21 is formed facing each other.

  When the release liner 10 is bonded to the adhesive layer 21 of the sheet material 2 before the printing layer 11 is formed, the release liner 10 on which the printing layer 11 is formed is bonded before. The sheet material 2 is again brought into contact with the pressure-sensitive adhesive layer 21. By printing on the release liner 10 that has been bonded to the pressure-sensitive adhesive layer 21 of the sheet material 2 and bonding it to the pressure-sensitive adhesive layer 21 again, the loss of the release liner 10 can be reduced.

(4) The degree of crosslinking of the pressure-sensitive adhesive layer 21 is increased.
Then, you may have further the process of raising the crosslinking degree of the adhesive layer 21. FIG.

  Thereby, the adhesiveness N2 between the pressure-sensitive adhesive layer 21 and the ink (printing layer 11) can be further increased, and when the release liner 10 is peeled from the pressure-sensitive adhesive layer 21 in the subsequent step (5), the release liner 10 The ink (printing layer 11) formed thereon can be peeled off from the release liner 10 and reliably transferred by the pressure-sensitive adhesive layer 21 (base material 20 side).

  As a method for increasing the degree of crosslinking of the pressure-sensitive adhesive layer 21, the same method as in the first embodiment described above can be used.

  The pressure-sensitive adhesive sheet 1 is manufactured through the steps (1) to (4). And since the observer of the adhesive sheet 1 will visually recognize the printing layer 11 through the base material 20 which has transparency, the printing layer 11 formed on the peeling liner 10 is in a state as it is (it is not reversed). You will recognize. That is, when printing on the release liner 10, it is not necessary to reverse characters and images. Moreover, since the printing layer 11 is not exposed to the outside and is covered with the pressure-sensitive adhesive layer 21 and the base material 20, it is possible to prevent the printing layer 11 from being scraped off or peeled off.

(5) Release the release liner 10 from the pressure-sensitive adhesive layer 21 When the pressure-sensitive adhesive sheet 1 is used, the release liner 10 is peeled off from the pressure-sensitive adhesive layer 21, and the pressure-sensitive adhesive layer 21 is attached to the adherend (paste). ) At this time, the printing layer 11 formed on the release liner 10 is peeled off from the release liner 10 side by the pressure-sensitive adhesive layer 21 and transferred to the substrate 20 side.

  At this time, the adhesion N1 between the release liner 10 and the ink (printing layer 11) is lower than the adhesion N2 between the pressure-sensitive adhesive layer 21 and the ink (printing layer 11) (N2> N1). When the release liner 10 is peeled from the adhesive layer 21, the ink (printing layer 11) formed on the release liner 10 is peeled off from the release liner 10 and reliably transferred to the pressure-sensitive adhesive layer 21 (base material 20 side). can do.

  Since the manufacturing method of the above-described embodiment does not go through a complicated process, it can be used for various types, and the pressure-sensitive adhesive sheet manufactured by this method can be used as various labels provided with a printing layer. And the adhesive label provided with the adhesion part is affixed on goods, for example, and displays the information with respect to a consumer and a purchaser.

  The display content of the printed layer and the form of the label are not particularly limited. For example, even if the label is printed in large quantities, the ID number, serial number, etc. are used for individual identification. It may be a label on which different contents are printed and used.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this, and can be appropriately changed without departing from the spirit of the invention.

  By using the method for producing a pressure-sensitive adhesive sheet according to the present invention, a pressure-sensitive adhesive sheet that can be used for various types without passing through complicated steps, has no loss of a release liner, and prevents peeling of a printed layer is produced. And can be widely used as a method for producing various adhesive labels.

DESCRIPTION OF SYMBOLS 1 Adhesive sheet 2 Sheet material 10 Release liner 11 Print layer 20 Base material 21 Adhesive layer 30 Base material 31 Print layer 32 Adhesive layer 33 Release liner 40 Substrate N1 Adhesiveness N2 Adhesiveness

Claims (7)

Forming a print layer by printing on a release liner;
Forming a pressure-sensitive adhesive layer on the surface of the release liner on which the printing layer is formed;
Bonding a base material having optical transparency on a surface of the pressure-sensitive adhesive layer opposite to the release liner;
The manufacturing method of the adhesive sheet characterized by having. Forming a print layer by printing on a release liner;
A step of bringing a sheet material having a light-transmitting base material and a pressure-sensitive adhesive layer provided on one surface side of the base material into contact with the print layer of the release liner from the surface of the pressure-sensitive adhesive layer; The manufacturing method of the adhesive sheet characterized by having.   The method for producing a pressure-sensitive adhesive sheet according to claim 2, wherein the release liner is bonded to the pressure-sensitive adhesive layer before the printing layer is formed. The printing step is a step of performing printing using ink,
The method for producing a pressure-sensitive adhesive sheet according to any one of claims 1 to 3, wherein the adhesion between the release liner and the ink is lower than the adhesion between the pressure-sensitive adhesive layer and the ink.   The method for producing a pressure-sensitive adhesive sheet according to any one of claims 1 to 4, wherein the maximum thickness of the print layer is 0.1 µm or more and 30 µm or less.   The ratio of the area of the said printing layer with respect to the area of the said adhesive layer in planar view of the said adhesive sheet is 0.1% or more and 90% or less, The manufacture of the adhesive sheet of any one of Claim 1 thru | or 5 Method.   The manufacturing method of the adhesive sheet of any one of Claim 1 thru | or 6 which further has the process of raising the crosslinking degree of the said adhesive layer.

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