JP2006299123A - Pressure-sensitive adhesive sheet with recessed part and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a pressure-sensitive adhesive sheet by which a prescribed recessed part pattern can be formed in a pressure-sensitive adhesive layer according to a simple method without requiring special release paper and air permeability can be ensured by the recessed part pattern and to provide the pressure-sensitive adhesive sheet obtained by the method. <P>SOLUTION: A substrate film 1 having the pressure-sensitive adhesive layer 2 is fed between an emboss roll 13 having protruding parts 13a of a prescribed pattern on the surface and a flat roll and pressed under conditions in which a recessed part-forming auxiliary liquid 16 is interposed in at least the protruding parts 13a. Thereby, recessed parts 3 of the prescribed pattern are formed in the pressure-sensitive adhesive layer 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a pressure-sensitive adhesive sheet with a recess and a method for producing the same, and more specifically, a method for producing a pressure-sensitive adhesive sheet with a recess that can easily form a pattern concave portion in a pressure-sensitive adhesive layer, and a pressure-sensitive adhesive with a recess produced by the method. Regarding the sheet.

  Conventionally, as this type of pressure-sensitive adhesive sheet, a sheet having a base film, a pressure-sensitive adhesive layer laminated on the back surface of the base film, and a release paper covering the pressure-sensitive adhesive layer is known (for example, see Patent Document 1). .

  In this conventional pressure-sensitive adhesive sheet, a plurality of concave portions are formed in advance on one side or both sides of the release paper, and the pressure-sensitive adhesive layer is applied and dried on the concave-side surface of the release paper, and then a base film is laminated on the pressure-sensitive adhesive layer. Alternatively, it is manufactured by applying and drying an adhesive layer on the back surface of the substrate film, and then laminating the adhesive layer with the release paper in pressure contact with the surface on the concave side (see, for example, Patent Document 2). Therefore, when the release paper is peeled from the adhesive layer, convex portions formed by a plurality of concave portions of the release paper are formed on the surface of the adhesive layer, and grooves are formed between the convex portions. The groove serves to release air between the adhesive layer and the adherend when the adhesive sheet is attached to an adherend such as a wall or a column.

JP 2001-302999 A Japanese Patent No. 3377439

However, since the conventional pressure-sensitive adhesive sheet forms a plurality of recesses on one or both sides of the release paper, the material to be the release paper must be able to hold the shape of the formed recesses for a certain period of time. A new material was necessary. Moreover, when forming a recessed part in release paper, a peeling surface might be damaged and the peelability might be impaired by the damage.
In addition, since the pressure-sensitive adhesive sheet has a pressure-sensitive adhesive layer laminated on the entire surface of the base film, for example, when applied to medical supplies that require breathability, such as adhesive bandages and medical tapes that are used by sticking to human skin. In addition, a breathable woven fabric cannot be used as the base film, and it takes time and effort to form vent holes in the base film that does not have breathability.

  Therefore, the present invention does not require a special release paper, and can form a predetermined concave pattern on the adhesive layer by a simple method, and can provide air permeability by the concave pattern. It aims at providing the manufacturing method of a sheet | seat, and the adhesive sheet with a recessed part obtained by it.

Thus, according to the present invention, a base film having an adhesive layer or a release paper having an adhesive layer is supplied between an embossing roll and a flat roll having convex portions of a predetermined pattern on the surface, and at least the convex portions are provided. There is provided a method for producing a pressure-sensitive adhesive sheet with a recess, which is pressed under conditions where a recess-forming auxiliary liquid is interposed to form a predetermined pattern of recesses in the pressure-sensitive adhesive layer.
Moreover, according to another viewpoint of this invention, it is the adhesive sheet with a recessed part manufactured with the manufacturing method of the said laminated sheet with a recessed part, Comprising: The base film and the adhesive layer laminated | stacked on one surface of this base film There is provided a pressure-sensitive adhesive sheet with a recess, wherein the pressure-sensitive adhesive layer has a predetermined pattern of recesses, and one surface of the base film is exposed in at least a part of the bottom region of the recess.

According to the manufacturing method of the pressure-sensitive adhesive sheet with recesses of the present invention, the pressure-sensitive adhesive layer can be pressed until the pressure-sensitive adhesive layer comes into contact with the base film under the condition that the concave-forming auxiliary liquid adheres to the convex part of the embossing roll. A concave portion in which the base film is exposed can be formed by being pushed out from the convex portion pressing region to the outer region and separating the convex portion from the adhesive layer. At this time, formation of the concave portion in the adhesive layer and retention of the shape of the concave portion are facilitated by the concave portion forming auxiliary liquid adhering to the convex portion. For example, when the concave forming auxiliary liquid is a solvent that is mainly soluble in the adhesive material that forms the adhesive layer, the adhesive force of the adhesive layer (adhesive material) in the convex pressing area is weakened, and the convex part adheres after pressing. It is possible to leave the layer smoothly (adhesive layer does not stick to the convex part), and the adhesive layer becomes soft and the top surface of the convex part comes into contact with the base film, and the bottom part of the concave part after formation is sure The base film can be exposed. Therefore, a special release paper as in the prior art is not required for forming the recess in the adhesive layer, and the recess can be formed by a simple method.
Further, when the base film is stretchable or is a material having a rough surface (for example, elastomer, breathable woven fabric, non-woven fabric, etc.), the base film made of a material having no stretch and a smooth surface is used. Compared to the case, since it is not easy to form the adhesive layer on the base film and to form the recesses on the adhesive layer, in such a case, a laminate of the adhesive layer on the release paper can be used. In this case, after forming the concave portion on the adhesive layer, the base film is laminated on the adhesive layer, thereby forming an adhesive sheet with the base film exposed at the bottom surface of the concave portion of the adhesive layer as described above.
In addition, the pressure-sensitive adhesive sheet of the present invention thus obtained is one in which the base film is exposed in the concave portion of the pressure-sensitive adhesive layer. Therefore, when breathable woven fabric or nonwoven fabric is used as the base film, human skin It can be applied to medical supplies that require air permeability, such as adhesive bandages and medical tapes that are attached to the surface, and it is not necessary to form air holes in a base film that does not have air permeability as in the past. It becomes.

The pressure-sensitive adhesive sheet with a recess according to the present invention (hereinafter sometimes simply referred to as a pressure-sensitive adhesive sheet) is obtained by laminating a pressure-sensitive adhesive layer on one surface of a base film and a release paper on the surface of the pressure-sensitive adhesive layer. And the recessed part is formed in the adhesion layer by the predetermined pattern, and one side or all of the adhesion layer is removed from the bottom face of the recessed part, and one surface of the base film is exposed.
This pressure-sensitive adhesive sheet supplies a substrate film having a pressure-sensitive adhesive layer or a release paper having a pressure-sensitive adhesive layer between an embossing roll and a flat roll having convex portions of a predetermined pattern on the surface, and at least the convex portions are provided with a concave portion formation aid. It can manufacture by pressing on the conditions which a liquid interposes and forming the recessed part of a predetermined pattern in the said adhesion layer.

  In the present invention, the substrate film is not particularly limited, and those generally used in the field can be used. For example, paper, plastic film, and synthetic paper laminated with plastic film Examples thereof include paper, elastomer, breathable woven fabric (mesh of about 20 to 500), and non-woven fabric. In addition, the base film may be a film on which a photograph, a picture, a character, an advertisement content, or the like is printed.

  The material for the pressure-sensitive adhesive layer is not particularly limited, and acrylic pressure-sensitive adhesive materials, rubber-based pressure-sensitive adhesive materials and the like that are generally used in this field can be used. In particular, an acrylic pressure-sensitive adhesive material in which the following acrylic resin composition and a curing agent are mixed at a blending ratio of 100: 0.4 to 2.0 is preferable. As the acrylic resin composition, molecular weight: about 150,000, composition: 2-ethylhexyl acrylate, vinyl acetate, methacrylic acid or acrylic acid liquidine AR-2420 (manufactured by Big Technos) is preferably used. Moreover, as said hardening | curing agent which comprises an acrylic adhesive material, composition: Tolylene diisocyanate, Coronate L-55E of a trimethylol propane (Urethane resin: Nippon Polyurethane Co., Ltd.), Liquidine HD107 (Aluminum chelate: Big Technos Co., Ltd.) Liquidane HD5060 (epoxy resin: manufactured by Big Technos) or the like is preferably used.

  Also, the pattern shape of the recess formed in the adhesive layer is not particularly limited, and for example, a continuous pattern such as a lattice shape, a honeycomb shape, a stripe shape, a dotted line shape, a dot shape (scattered dot shape), etc. A discontinuous pattern can be mentioned. In addition, it is desirable that the width and size of the recesses be uniform and evenly arranged in order to prevent partial biasing of the adhesive sheet.

The recessed area occupation ratio relative to the unit area of the pressure-sensitive adhesive sheet is 5 to 90%, preferably 10 to 80%. By setting it as such a recessed area occupation area, peeling of the adhesive sheet affixed on the to-be-adhered body becomes easy. In addition, when applying adhesive sheets to medical supplies that require breathability, such as adhesive bandages and medical tape that are used as breathable fabrics, for example, as a breathable fabric, it is necessary to ensure appropriate breathability. it can.
In addition, when a recessed area occupation area rate is smaller than 5%, while force is required for peeling of an adhesive sheet, it becomes difficult to obtain sufficient air permeability as medical supplies. Moreover, when larger than 90%, the adhesive force as an adhesive sheet is insufficient.

In the pressure-sensitive adhesive sheet of the present invention, a peelable release sheet may be adhered to the surface of the pressure-sensitive adhesive layer.
The release sheet is not particularly limited, and those commonly used in the field can be used. For example, a release surface such as paper, a plastic sheet, and a laminated sheet obtained by laminating paper with a plastic sheet. And a release agent coated with a release agent that improves the releasability from the adhesive layer.

  The recess formation auxiliary liquid supplied to the embossing roll when forming the recesses on the adhesive layer is a liquid containing at least a solvent soluble in the adhesive material that forms the adhesive layer. Or the liquid containing a thermosetting resin is mentioned.

In the concave portion forming auxiliary liquid, the solvent soluble in the adhesive material for forming the adhesive layer is the adhesive layer (adhesive material) in the convex pressing area when the concave portion is formed in the adhesive layer at the convex portion of the embossing roll. The adhesive strength of the concave portion is weakened with the concave portion forming auxiliary liquid, and after pressing, the convex portion smoothly separates from the adhesive layer (the adhesive layer does not adhere to the convex portion), and the adhesive layer is softened and the top surface of the convex portion Has a role of reliably contacting the base film and exposing the base film reliably at the bottom of the recess after formation. Moreover, the solvent insoluble in the adhesive material for forming the adhesive layer has a role of making it difficult for the adhesive material to adhere to the convex portions of the embossing roll and making the concave portions after formation difficult to lose shape. In order to form a desired recess in the adhesive layer, the solvent soluble or insoluble in the adhesive material may be used alone or appropriately depending on the adhesive material used, the thickness of the adhesive layer, the width and shape of the recess, etc. It can be used by mixing at a ratio.
In addition, the plasticizer has a role of softening the pressure-sensitive adhesive layer like the solvent, and the plasticizer reinforces the softening of the pressure-sensitive adhesive layer because the solvent is easily volatilized.
In addition, in the curing agent, the adhesive material of the portion that is in contact with the convex portion and is extruded to the outer region of the convex pressing region constitutes the side wall of the concave portion, and the adhesive material of the concave portion side wall portion reacts with the curing agent and cures. Therefore, there is a role that facilitates maintaining the shape of the recess.
Moreover, although thermosetting resin has the same role as the shape maintenance of the recessed part by the said hardening | curing agent, in this case, it hardens | cures with the heat | fever in the drying process of an adhesion layer.

The solvent is not particularly limited as long as it is soluble in an adhesive material, and examples thereof include one or more mixed solvents such as ethyl acetate, butyl acetate, methyl ethyl ketone, and methyl isobutyl ketone.
The plasticizer is not particularly limited as long as there is no problem with the compatibility with the adhesive material. For example, as the plasticizer applicable to the adhesive material of the acrylic resin composition, dibutyl phthalate (DBP), dioctyl adipate ( DOA), dioctyl phthalate (DOP), and the like. Specifically, for example, DBP (manufactured by Showa Ether Co., Ltd.), DOA (manufactured by J Plus Co.), DOP (J Plus Co., Ltd.) Can be used. The amount (active ingredient) of the plasticizer in the recess formation auxiliary liquid is 0.01 to 5.0% by weight, preferably 0.05 to 1.0% by weight.

The curing agent is not particularly limited as long as it can cure the adhesive material. For example, the curing agent applicable to the adhesive material of the acrylic resin composition is the same as the curing agent constituting the adhesive material. Can be used. The amount (solid content) of the curing agent in the recess formation auxiliary liquid is 0.01 to 5.0% by weight, preferably 0.05 to 1.0% by weight.
Although it does not specifically limit as a thermosetting resin, For example, an epoxy resin, a polyurethane resin, etc. are mentioned, for example, as an epoxy resin, for example, the main ingredient: Epicoat 828 (made by Shell) and a hardening | curing agent: Ditokural HD-438 are mentioned. (Manufactured by Daito Sangyo Co., Ltd.) can be mixed and used at a weight ratio of 100: 70. As the urethane resin, the main agent: Acridic A-801 (manufactured by Dainippon Ink & Chemicals, Inc.) and the curing agent: Takenate D-140N (manufactured by Mitsui Takeda Chemical Co., Ltd.) can be mixed and used at a weight ratio of 100: 45. The amount (solid content) of the thermosetting resin in the recess formation auxiliary liquid is 0.01 to 5.0% by weight, preferably 0.05 to 1.0% by weight.
Moreover, when the solvent soluble in the adhesive material forming the adhesive layer is aqueous (when the adhesive is soluble in water), adding an appropriate amount of water-soluble casein to the aqueous solvent hardens the side surface of the recess. Therefore, it is preferable from the viewpoint of making it difficult to lose its shape.

Next, the manufacturing method of the adhesive sheet with a recessed part of this invention is demonstrated based on drawing.
FIG. 1 is a schematic diagram illustrating the manufacturing process of the pressure-sensitive adhesive sheet with recesses of the present invention, and FIG. 2 is an explanatory diagram illustrating the process of forming a recess in the pressure-sensitive adhesive layer in manufacturing the pressure-sensitive adhesive sheet with recesses of the present invention. 3 is a partial plan view showing a pattern of recesses formed in the adhesive layer in the present invention.

  The pressure-sensitive adhesive sheet of the present invention can be produced by a production apparatus as shown in FIG. This manufacturing apparatus includes an adhesive material supply unit 12 provided on a first roll 11, an embossing roll 13 having convex portions 13 a arranged in a predetermined pattern on the surface, and a flat surface arranged oppositely under the embossing roll 13. A roll 14, a concave portion forming auxiliary liquid supply unit 15 for attaching a concave portion forming auxiliary liquid to the convex portion 13 a of the embossing roll 13, and a drying furnace 20 are provided.

The adhesive material supply unit 12 is not particularly limited as long as the adhesive material can be applied to the one surface of the base film 1 with a uniform film thickness. For example, a mechanism for flowing the adhesive material on the base film in a curtain shape, or a roll A mechanism for transferring the adhesive material applied to the surface onto the base film is conceivable.
Although the pattern shape of the convex part 13a of the embossing roll 13 is not specifically limited, For example, it can be set as the lattice shape as shown to Fig.3 (a), or the dotted line shape as shown to FIG.3 (b). The dimension from the outer peripheral surface of this embossing roll 13 to the top surface of the convex part 13a is about 0.1-2.0 mm.

Moreover, the recessed part formation auxiliary liquid supply part 15 will not be specifically limited if it is a mechanism which can make a recessed part formation auxiliary liquid adhere to at least the convex part 13a of the embossing roll 13, For example, in this Embodiment, the embossing roll 13 A contact roll 15a that comes into contact with the surface of the top of the convex portion 13a and a supply tank 15b that contains the recess formation auxiliary liquid and uniformly applies a predetermined amount of the depression formation auxiliary liquid to the contact roll 15a. be able to. In this case, a rubber layer or an elastic resin layer is provided on the surface of the abutting roll 15a, and the top surface of the convex portion 13a of the embossing roll 13 is in close contact with the abutting roll 15a so that the concave forming auxiliary liquid is supplied to the top surface of the convex portion 13a. It is preferable that it can be reliably and easily attached to the side surface.
Although not shown in the drawing, a means for removing surplus portions of the concave forming auxiliary liquid adhering to the convex portion of the embossing roll 13 on the upstream side in the transport direction of the embossing roll 13 and an embossing on the downstream side in the transporting direction of the embossing roll 13. A means for cleaning the roll 13 may be provided.

  In the production of the pressure-sensitive adhesive sheet, first, the pressure-sensitive adhesive material supply unit 12 applies a pressure-sensitive adhesive material to the surface of the base film 1 with a film thickness of, for example, 5 to 100 μm to form the pressure-sensitive adhesive layer 2. Under the present circumstances, the conveyance speed of the base film 1 can be 3.0-30.0 m / min, for example.

  Thereafter, the base film 1 having the adhesive layer 2 is supplied between the embossing roll 13 and the flat roll 14, and the recess 3 is formed in the adhesive layer 2. At this time, as shown in FIG. 2A, the concave portion forming auxiliary liquid 16 supplied from the adhesive material supply unit 12 adheres to the convex portion 13a of the embossing roll 13, as shown in FIG. When the pressure-sensitive adhesive layer 2 is pressed by the convex portion 13a, the portion of the pressure-sensitive adhesive layer 2 to which the concave portion forming auxiliary liquid 16 is attached is pushed out to the outer region of the convex portion pressing region. At this time, the top surface of the convex portion 13 a comes into contact with the base film 1, but the outer peripheral surface of the embossing roll 13 does not contact the adhesive layer 2. Then, as shown in FIG. 2 (c), the concave portion 3 is formed by separating the convex portion 13 from the adhesive layer 2, and the adhesive material portion 17 to which the concave portion forming auxiliary liquid adheres forms the side wall of the concave portion 3. . Thus, when the recessed part 3 is formed in the adhesion layer 2 with the embossing roll 13, the recessed part formation auxiliary | assistant liquid is acting as mentioned above.

Thus, after the recessed part 3 was formed in the adhesion layer 2, it is dried in the drying furnace 20, for example at 80-110 degreeC for 1-3 minutes, and the peeling sheet 4 is laminated | stacked on the surface of the adhesion layer 2 after that. (See FIG. 2D).
1 and 2 exemplify the manufacturing steps in the order of laminating the adhesive layer on the base film, forming the recesses in the adhesive layer, and laminating the release paper on the adhesive layer, but laminating the adhesive layer on the release paper Then, the pressure-sensitive adhesive sheet may be produced in the order of forming a recess in the pressure-sensitive adhesive layer and laminating the base film on the pressure-sensitive adhesive layer.

The pressure-sensitive adhesive sheet of the present invention thus formed has a pattern shape of the concave portion 3 of the pressure-sensitive adhesive layer 2 that is the same pattern as the convex portion of the embossing roll. In the present embodiment, for example, as shown in FIG. A grid or a scattered dot as shown in FIG.
Since the recess 3 is continuous in the lattice pattern, air is released to the outside through the recess when the adhesive sheet is attached to the adherend, and the sheet surface is prevented from being swollen between the adhesive sheet and the adherend. can do. Therefore, this pressure-sensitive adhesive sheet is suitable for a poster in which a photograph, an advertisement or the like is printed on the surface of the base film.
Moreover, although the recessed part 3 is discontinuous in a dotted pattern, the air between an adhesive sheet and a to-be-adhered body is absorbed in each recessed part 3, and the swelling of the sheet | seat surface by an air pocket is suppressed.
In addition, the pressure-sensitive adhesive sheet of the present invention having such a continuous and discontinuous recess pattern allows the base film to be exposed at the bottom of the recess. It can also be applied to medical supplies that require breathability, such as adhesive bandages and medical tapes that are used by sticking to the skin.

Example 1
The pressure-sensitive adhesive sheet of Example 1 was produced under the following conditions using the manufacturing apparatus of FIG.
-Base film: Breathable fabric-Adhesive layer: Acrylic adhesive material, film thickness 35 µm, drying condition 90 ° C, 2 minutes-Recess: Occupied area ratio 30%, discontinuous pattern shown in Fig. 3 (b) Example 1 As a result of conducting the air permeability test of the adhesive sheet according to JIS P 8117, it was 0.1 second or less.

(Example 2)
The pressure-sensitive adhesive sheet of Example 2 was produced under the following conditions using the manufacturing apparatus of FIG.
・ Base film: synthetic paper ・ Adhesive layer: acrylic adhesive material, film thickness 35 μm, drying condition 90 ° C., 2 minutes ・ Recess: Occupied area ratio 20%, continuous pattern shown in FIG. The sheet was affixed to a polystyrene foam plate and allowed to stand at 40 ° C. for 24 hours. As a result of observing swelling on the sheet surface side, no swelling was observed.

  The pressure-sensitive adhesive sheet of the present invention can be applied to advertising media and medical supplies that require breathability (such as adhesive bandages and medical tapes).

It is a schematic diagram explaining the manufacturing process of the adhesive sheet with a recessed part of this invention. It is explanatory drawing which shows the recessed part formation process to the adhesion layer in manufacture of the adhesive sheet with a recessed part of this invention. It is a fragmentary top view which shows the pattern of the recessed part formed in the adhesion layer in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base film 2 Adhesive layer 3 Concave part 4 Release sheet 13 Embossing roll 13a Convex part 16 Concave formation auxiliary liquid 17 Adhesive layer part to which the concave part formation auxiliary liquid adhered

Claims (5)

  A condition in which a base film having an adhesive layer or a release paper having an adhesive layer is supplied between an embossing roll and a flat roll having convex portions of a predetermined pattern on the surface, and at least the concave portion forming auxiliary liquid is interposed in the convex portions A method of manufacturing a pressure-sensitive adhesive sheet with a recess, wherein the pressure-sensitive adhesive layer is pressed down to form a recess having a predetermined pattern in the pressure-sensitive adhesive layer.   The manufacturing method of the adhesive sheet with a recessed part of Claim 1 which a recessed part formation auxiliary liquid consists of a solvent soluble in the adhesive material which forms an adhesion layer, and / or an insoluble solvent.   The manufacturing method of the adhesive sheet with a recessed part of Claim 2 in which a recessed part formation auxiliary liquid contains a plasticizer, a hardening | curing agent, or a thermosetting resin.   The base film having an adhesive layer or the release paper having an adhesive layer is formed in situ by supplying an adhesive material to the base film or release paper. A method for producing an adhesive sheet.   It is an adhesive sheet with a recessed part manufactured with the manufacturing method of the laminated sheet with a recessed part as described in any one of Claims 1-4, Comprising: The base film and the adhesive layer laminated | stacked on one surface of this base film The pressure-sensitive adhesive sheet has a concave portion in which the pressure-sensitive adhesive layer has concave portions of a predetermined pattern, and one surface of the base film is exposed in at least part of the bottom surface region of the concave portion.

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