WO2009066801A1 - Pressure-sensitive adhesive sheet and process for producing the same - Google Patents

Abstract

A pressure-sensitive adhesive sheet which comprises a base sheet (5) and, formed on at least one side thereof, a pressure-sensitive adhesive layer (12) having independent protrudent parts (1). In the pressure-sensitive adhesive layer (12), the protrudent parts, which come into contact with an adherend, each has a hollow (4) inside, the hollow communicating with the outside through an opening (2) formed in an upper area of the protrudent part. Also provided is a process for producing the pressure-sensitive adhesive sheet which comprises preparing a release sheet (11) having on a surface thereof a releasing layer with a rugged transfer surface, forming on the releasing layer a pressure-sensitive adhesive layer (12) having a thickness smaller than the depth of the recessed parts of the ruggedness, and then laminating a base sheet (5) to the pressure-sensitive adhesive layer (12). Features of this pressure-sensitive adhesive sheet reside in that in applying the sheet to an adherend, air exclusion is easy and positioning is easy, and that the application thereof gives a satisfactory appearance having no ruggedness attributable to the shape of the protrudent parts of the pressure-sensitive adhesive layer (12).

Description

 Description Adhesive sheet and ^^ process leakage field

 The present invention relates to an adhesive sheet and its production. More specifically, the present invention has a pressure-sensitive adhesive layer having a plurality of independent convex part forces S having a hollow part inside and communicating with the outside through an opening formed on the upper surface thereof. And when affixing to the adherend, the aerodynamic force S comes off, the ^ i L is easy to place, and sticks with a squeegee. The present invention relates to a pressure-sensitive adhesive sheet in which unevenness due to the convex shape of the pressure-sensitive adhesive layer does not appear and a good appearance force S, and to efficiently produce this pressure-sensitive adhesive sheet. Background sickle

 Conventionally, a pressure-sensitive adhesive sheet is generally composed of a sheet, a pressure-sensitive adhesive layer formed on the surface thereof, and a release sheet usually provided thereon. In this case, the release sheet is peeled off, and the adhesive layer is attached so that the adhesive layer is in contact with the adherend.

 However, this adhesive sheet has a wide area, ^ 8 \ There is no air retention between the adhesive layer and the adherend, and this air accumulation part is As a result, there was a problem that a swelling occurred on the surface side of the adhesive sheet occupied by the shellfish, and it was difficult to stick the adhesive sheet cleanly 1 ". To re-apply shellfish, to attach to an adherend such as glass, it is difficult to wet the adherend with an interface ¾tt ^ Have been taken ^

 Therefore, in order to solve such a problem, for example, as a rice occupying sheet that can be easily shelled without air, a surface sheet and an adhesive layer having a large number of independent small convex portions A pressure-sensitive adhesive sheet (see, for example, Reference 1) composed of a peeling member having an independent small concave portion that closely adheres to the small convex portion has been used. However, in such a pressure-sensitive adhesive sheet, since air escapes from the gap between the adherend and the portion other than the small convex portion to be adhered to the adherend, so-called “blowing” does not occur. There is a defect that unevenness due to the convex part of the pressure-sensitive adhesive layer becomes worse on the surface of the genius.

[TF Reference 1] Japanese Utility Model Publication No. 6-2 0 0 4 3 Disclosure of the invention

 [Invention power S

 Under such circumstances, the present invention has a structure in which the air is easily removed and the force position is easy when the adherend is formed, and the uneven force due to the convex shape of the pressure-sensitive adhesive layer can be exerted. It is an object of the present invention to provide a pressure-sensitive adhesive sheet that can provide good wrinkles and to efficiently produce the pressure-sensitive adhesive sheet.

 [Means to solve]

 As a result of intensive studies to achieve the above object, the present inventor has obtained the following knowledge. A pressure-sensitive adhesive sheet having a plurality of independent convex part forces S provided with an adhesive layer having a hollow part inside and communicating with the outside through an opening formed on the upper surface thereof is attached to an adherend. Air is removed when attached, force is difficult to position due to small repellent fibers with the adherend, and squeegee sticks, the cavity inside the convex part It has been found that since the partial force is 3 m, there is no unevenness due to the convex shape of the surface [occupant layer], and a good surface roughness can be obtained. In addition, such an adhesive sheet uses a release sheet provided with a peeling ail force s having a concave transfer surface on the surface, and the depth of the concave portion in the concave shape on the peeling sheet 1. After opening the ij layer of rice occupancy ij, which is smaller and thicker than that, it was found that this can be done by pasting an aged sheet to the adhesive layer.

 The present invention has been developed based on strong knowledge.

 That is, the present invention

 [1] A pressure-sensitive adhesive sheet in which a pressure-sensitive adhesive layer having a plurality of independent convex portions is provided on at least one surface of a paper sheet,

 In the adhesive layer, the pressure-sensitive adhesive sheet has a convex part that is in contact with the adherend and has a hollow part inside, and is communicated to the outside through an opening formed on the upper surface of the adhesive part.

 [2] 50% or more of all convex portions in contact with the adherend have a hollow portion inside, and an opening ^ on the upper surface of the force.

 [3] The pressure-sensitive adhesive sheet according to the above [1] or [2], wherein the total of the bottom surface of each convex portion in contact with the adherend is 10 to 90% of the pressure-sensitive adhesive layer,

[4] The shape of the convex portion in contact with the adherend is a substantially semi-circular or substantially blue circle having a height of 5 to 25 50 / im, and is substantially hemispherical. ~: 1 5 0 0 / im, abbreviated blue circle The bottom surface has a major axis of 100 to 2000 / χπι, and a minor axis of 50 to 1000 〃 m. The items [1] to [3] above, the miscellaneous adhesive sheet,

 [5] In the convex portion in contact with the adherend, between the adjacent convex portions: ^ «is 1 to 2000 μπι, or the adhesive sheet of the above [1] to [4],

 [6] The pressure-sensitive adhesive sheet according to any one of the above [1] to [5], wherein the age of bonding to the adherend and the pressure-sensitive adhesive layer is 5 to 200 μπι, and

[7] [1] to [6], wherein Les, or to be in S¾t ^ removed by the adhesive sheet Genko displacement, peeling having an uneven shape transfer surface to the surface »3 force ^s provided with a release sheet An adhesive layer having a thickness smaller than the depth of the concave portion in the concave shape is formed on the peeling, and then the adhesive sheet is bonded to the adhesive layer by sticking St octo to the adhesive layer. ,

¾ ^.

 [The invention's effect]

 The pressure-sensitive adhesive sheet of the present invention has a pressure-sensitive adhesive layer provided with a plurality of independent convex part forces S, which has a hollow part inside and communicates with the outside through an opening formed on the upper surface thereof. When affixing to the adherend, the aerodynamic force S comes off, and because the area of the transmissible area with the adherend is small, the position is easy, and it is affixed with a squeegee. Since the cavities of mL are mL, the unevenness caused by the convex shape of the adhesive layer is not reduced, and a projectile is obtained. Brief Description of Drawings

Fig. 1 is a plane of an example of the pressure-sensitive adhesive layer in the pressure-sensitive adhesive sheet of the invention ^: Fig., Fig. 2 is the center of the convex part in the above-mentioned plan schematic diagram »¾ (surface schematic diagram, Fig. 3 ( (a) to (c) are schematic diagrams for explaining the leakage formed when the cavity force S is formed inside the convex portion in the pressure-sensitive adhesive layer and the opening force S is formed on the upper surface of the force convex portion. g.4 is a schematic longitudinal sectional view of the convex part of the adhesive layer formed of ^-«S in F i g.3 (a) to (c) above, and F i g.5 (a) is an example. Approximate half-shaped recess and approximately blue circle used Recess force S Formed shape ^ Electron micrograph of release sheet with copy plane, F g.5 (b), F i g.5 (a) A plan view created by tracing the boundary line of the recess, and F i g.6 (a) i «H An electron micrograph of a pressure-sensitive adhesive sheet having a convex portion with an opening formed on the upper surface, F i g.6 (b) is F i g.6 (a ) Is a plan view created by tracing the boundary line of the convex part in the figure, where 1 is the convex part, 2 is the opening on the top surface of the convex part, 3 is the flat part between the convex parts, 4 is Sky Cave, 5 ¾ St-age sheet, 1 1 is release sheet, 1 2 {occupant layer, 1 3 and 1 3 a are bubbles, 1 is recessed, 2 is approximately hemispherical recess, 2 is approximately semi-elliptical The body-shaped concave portion, 24 is a substantially hemispherical convex portion group, 25 is a substantially ^ f-convex convex portion, and 26 is an opening portion. BEST MODE FOR CARRYING OUT THE INVENTION

 In the pressure-sensitive adhesive sheet of the present invention, a pressure-sensitive adhesive layer strength S having a plurality of independent convex portions having specific properties is formed on at least one surface of the paper sheet.

 [Adhesive layer 3 The adhesive layer j is provided with a plurality of independent convex portions, and these convex portions are substantially formed when the present occupying sheet is put on the adherend. There may be only convex portions that are in contact with the adherend, and a convex portion group that is in contact with the adherend and a small convex portion group that is lower in height force s and does not contact the adherend. You can mix them.

 The small convex portion group that is not in contact with the adherend is usually formed in a flat portion between the convex portion and the convex portion that are in contact with the adherend.

 In the present invention, from the viewpoint of wrinkles on the surface of the St-old surface, the wrinkle-shaped portion contacting the adherend is preferably 50% or more, more preferably 60% or more, and still more preferably 80% or more. It has a hollow portion and communicates with the outside through an opening formed on the upper surface of the force.

 Note that the convex portion that contacts the adherend has a hollow portion inside, and has a structure that communicates with the outside by an opening formed on the upper surface of the force; This will be described in 3t¾¾ of the pressure-sensitive adhesive sheet.

 Further, in the present invention, the total of the bottom surface of each convex portion in contact with the adherend is 10 to 90% of the pressure-sensitive adhesive layer because of the ease of positioning m ^. Preferably, 15 to 85% more preferred.

 Next, the shape of the convex portion in contact with the adherend in the pressure-sensitive adhesive layer will be described with reference to the drawings.

 1 shows a schematic plan view of one example of the pressure-sensitive adhesive layer, and Fig. 2 shows a schematic diagram of the center line of the convex portion in the plane.

In Fig. 1 and Fig. 2, 1 indicates a convex portion having a hollow portion 4 inside and communicating with the outside through an opening 2 formed on the upper surface. 3 is a flat part between adjacent convex parts 1 5 represents a base sheet.

In the present invention, in particular restrictions leave the shape of the convex portion in contact with the adherend, but it forces ^s preferably substantially a hemispherical shape or a substantially雜円positions. From the viewpoint of cavity formation, the height h is about 5 to 250 μm, preferably 20 to 200 μm, and in the case of a substantially hemispherical shape, the bottom diameter is 50 to 1500 μπι 禾 M, Preferably, it is 100 to 1000 zm, and it is a rough blue circle ίφ ^^ ", where the major axis of the bottom is 100 to 2000; / mSS, preferably 200 to 1500 m, the minor axis is 50 to: l OOO / z mg¾ Preferably, it is 100 to 700 μm.

 In the present invention, a substantially blue circle ^^ refers to a shape obtained by cutting a substantially ellipsoid into a plane that includes the maximum major axis and the maximum minor axis and approximately half in a TO plane. Includes solids with similar shapes such as molds, m. Sausage molds, rugby Bonore molds, etc.

 The average thickness b of the outer shell at the convex portion in contact with the adherend is about 5 to 2 μμπι, preferably 10 to 10 μμπι from the viewpoint of cavity formation.

 Also, in the convex portion in contact with the adherend, between adjacent convex portions; a is from 1 to 2000 im¾g, preferably from 2 to 150 μμπι, because of the vacancy.

As described above, the convex portion in contact with the adherend may be formed on the flat portion 3 between the adjacent convex portions with a small convex portion force ^s that does not contact the adherend. The small convex portion may have a hollow portion or may not have a hollow portion. The thickness c of the flat portion 3 is usually 5 to 20 μμπι¾¾, preferably 10 to 10 Ojum.

 Furthermore, the thickness of the pressure-sensitive adhesive layer obtained by bonding the pressure-sensitive adhesive sheet of the present invention to the adherend is usually 5 to 200 μm from the viewpoint of the adhesion with the adherend and the balance of the formation of the cavity of the convex portion. m, preferably 10 to 100 im. .

 The semi-occupying sheet of the present invention having such a shape of the occupant layer has the following effects.

(1) The position is easy because the air escapes when sticking to the adherend and the area of the insect repellent with the adherend is small.

 (2) The pressure-sensitive adhesive sheet was affixed to the adherend with a squeegee. There will be nothing and it will be excellent.

 (m

The pressure-sensitive adhesive used for forming the pressure-sensitive adhesive layer is not particularly limited, and any of those commonly used for the pressure-sensitive adhesive layer of the conventional adhesive sheet can be used appropriately. For example, acrylic pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, polyurethane-based pressure-sensitive adhesives, and polyester-based pressure-sensitive adhesives can be used. Also, it may be an emulsion, cat or IJ type deviation, and it may be a lifetime or non-regular deviation.

 [Xie sheet]

 The sheet used for the pressure-sensitive adhesive sheet of the present invention is not particularly limited, and various types of plastic sheets commonly used as a pressure-sensitive sheet such as a pressure-sensitive adhesive sheet having a occupant layer are used. be able to. On the surface of the talent, printing, printing, vapor deposition, sputtering, etc.

Machine cranes such as «ί layers, dust coats, antifouling coats, and light coats may be formed.

 Examples of the plastic sheet include polyethylene resins such as polyethylene, polypropylene, and various polyolefin copolymers, polyester resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate, polystyrene resins, polyvinyl chloride resins, Acrylic resin, polycarbonate resin, polyamide resin, polyurethane resin, fluorine resin such as polytetrafluoroethylene, polybutene, polybutadiene, polymethylpentene, ethylene vinyl acetate copolymer, ethylene (meth) acrylo Polymer, Ethylene (meth) Atari A Ester Copolymer, ABS resin, Ionoma Kazuki, Polyolefin, Polyurethane, Polystyrene, Polyvinyl chloride, Polyester And a sheet comprising a plastic elastomer containing these components and a mixture of these resins or an iia layer.

 In addition, these plastic sheets may be subjected to a surface treatment such as oxidation or unevenness, if desired, in order to improve adhesion to adhesive layers, printing layers, ink receiving layers, etc. Can be applied. Examples of the oxidation method include corona ¾w processing, plasma processing, chromium processing (humidity, flame processing, sm, ozone 'ultraviolet irradiation, it processing, etc., and examples of the roughening method include sand blasting, processing, etc. These surface treatment methods are appropriately selected according to the thickness of the film, but generally, the edge release method is preferably used from the standpoint of effectiveness and workability, etc. In addition, the primer layer Primer treatment can be applied.

For textiles, top-view, art paper, coated paper, craft paper, etc. are used. The basis weight is usually selected in the range of 40 to: I 20 g Zm ² .

In addition, a plastic sheet is used for the old sheet, but its thickness is not particularly limited, Usually, it is selected in the range of 20 to 500 μm, preferably 30 to 300 μm.

 [Production of adhesive sheet]

 The pressure-sensitive adhesive sheet according to the present invention is manufactured on the peeling sheet having a concave transfer surface on the surface S® force S on the peeling base layer 1 provided with a thickness smaller than the depth of the concave portion in the concave shape. The adhesive sheet of the present invention described above is manufactured by pasting the old rice occupant layer and then bonding the old sheet to the octopus occupant layer.

 According to the present method, first, a concave portion having a predetermined shape is formed on a tree-like layer such as a polyethylene layer provided on the surface of the release sheet Sit by a conventional method using an emboss slew or the like. Form a decorative surface by forming and then peeling off. Next, a pressure-sensitive adhesive layer is formed on the release sheet provided with the concave transfer surface force S by removing the follower * ^ to obtain a pressure-sensitive adhesive layer with a release sheet.

 In the present invention, when forming the above-mentioned Sj¾adhesive layer, an adhesive layer smaller than the depth of the concave portion on the concave surface is formed. This is to form a desired cavity inside the convex portion of the pressure-sensitive adhesive layer to be formed. The leakage of opening formation will be described later. Next, the sincerity-adsorbing agent layer is transferred to the sheet by adhering a gratitude sheet to the pressure-sensitive adhesive layer with release sheet. Thus, the pressure-sensitive adhesive sheet of the present invention having a pressure-sensitive adhesive layer having a hollow portion inside and having a convex portion communicating with the outside by an opening formed on the upper surface thereof. Can be manufactured. When separating, the release sheet is peeled off, the pressure-sensitive adhesive layer is brought into contact with the adherend, and affixed while applying pressure with a squeegee or the like. It can be attached to the cavity force in the strong convex part ¾¾τ, close contact 14 well. In addition, the shell-shaped adhesive sheet does not damage the wrinkles due to dents on the surface of the flocculated surface, or raised and recessed structures.

(Opening shape on top of convex part

 In the present invention, when the shelf is formed with an opening force S on the upper surface of the convex portion in the pressure-sensitive adhesive layer, it is not necessarily clear, but is estimated as shown below.

Fig. 3 (a) to (c) is a foolery diagram for explaining the formation of the opening force S on the upper surface of the convex portion in the layer. First, a release sheet 1 having an uneven shape transfer surface 1 When the pressure-sensitive adhesive layer 12 is applied with the concavo-convex shape on the top 1, bubbles 13 are swollen into the concave portions 14 of the release sheet 11 [Fig. 3 (a)]. As the pressure-sensitive adhesive layer 12 follows the surface of the recess due to its own weight, the thickness of the upper surface portion of the bubble 13 a decreases (Fig. 3 (b)). Eventually, the top surface of the bubble The opening part 2 is formed by opening the adhesive layer.

 When the sheet 5 is bonded to the pressure-sensitive adhesive layer with release sheet [Fig.3 (c)] thus obtained and the release sheet is peeled off, the schematic diagram of FIG. As shown in the figure, the pressure-sensitive adhesive layer has a cavity 4 inside, and a convex portion 1 is formed which communicates with the outside by an opening 2 formed on the upper surface of the cavity. Example

 Next, the present invention will be described in detail with reference to difficult examples, but the present invention is not limited to these examples.

Example 1

Laminated on 80 g of polyethylene on fine paper of 110 g Zm ² and using an embossing roll on the polyethylene side, the opening diameter shown in Fig. 5 (3) and i g.5 (b) is 30 Ομπι, A pattern consisting of a semi-f-shaped concave part with a depth of 5◦ μm, a major axis of 600 μm, a minor diameter of 240 μm, and a semi-elliptical concave part with a depth of 120 m is formed. A release sheet having a shape transfer surface was formed by applying a thickness of 0.1 μm. F i g.5 (a) is an electron micrograph of 醉 50 of a release sheet having a shape transfer surface formed with a substantially hemispherical concave portion and a substantially blue circular concave concave force S. 5 (b) is a plan view created by tracing the ^^ line of the recess based on F i g.5 (a). Reference numeral 22 is a substantially semi-concave recess, and 23 is a substantially semi-elliptical recess.

Next, on the release treatment layer of this release sheet, Atalinole-based rice occupant [Nippon Synthetic Chemical Industry Co., Ltd., “Coponil N-2147” 100 parts by mass, Nippon Polytane Ring “Colonet L” 1 mass After adding toluene to a solid content of 26% by mass with a knife coater at a gap of 230 μm and forming the rice occupant layer at 90 ° C for 30 hours, To this pressure-sensitive adhesive layer, 80 μπι thick polypropylene synthetic resin [Yupo Corporation tt, product name “Yupo SGS80”] was bonded. As a result, a convex portion having a hollow portion inside the shapes shown in F i g.6 (a) and F i g.6 (b) and communicating with the outside through the opening formed on the upper surface thereof. A pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer provided with a group of groups was added. F i g.6 (a) is an electron microscope with a magnification of 70, which is a pressure-sensitive adhesive sheet having a convex portion with an opening force S formed on the upper surface with a hollow portion inside the approximately blue circle TO convex portion. ^ Photo is a plan view created by tracing the orchid line of the convex portion based on F i g.6 (b) «F i g.6 (a). In Fig. 6, the substantially hemispherical convex portion group 24 has a collapsed internal cavity, but 9 9% of the substantially convex blue circular convex portion group 25 has It has a hollow part inside, communicates with the outside through an opening 26 formed on the upper surface, and forms a convex part in contact with the adherend. Roughly !! Shoe Convex Shape Group 2 Since the height is lower than 5, the contact with the adherend is not possible. The total area of the bottom surface of the approximately semi-ellipsoidal convex part is approximately 60%, the major axis of the bottom surface is approximately 60.000 μm, the minor axis is approximately 240.mu.m, and between adjacent convex parts. Of: about 50 μm, average thickness of outer shell was about 24 m, height ¾ 勺 10 μm, and diameter of opening was about 140 μm.

 The above ^ ¾ was measured using a running mystery electron microscope.

 Next, this adhesive sheet is lOOmmXlOOmm, peeled off the release sheet and pasted to the melamine plate with a squeegee. In addition, it was possible to stick well without sticking. Also, on the S ^ surface, an uneven shape that could damage the wrinkles was not observed. Industrial applicability

 The pressure-sensitive adhesive sheet according to the present invention allows air to escape when it is attached to an adherend, force f is easy to stand, and unevenness due to the convex shape of the pressure-sensitive adhesive layer is obtained. And there is a child ^ II.

Claims

The scope of the claims 1. a rice occupying sheet in which an adhesive layer force s having a plurality of independent convex portions is provided on at least one surface of a kinshi sheet,  (3) A pressure-sensitive adhesive sheet in which a convex portion in contact with an adherend has a hollow portion inside, and it is difficult to communicate with the outside by an opening formed on the upper surface thereof.  2. The pressure-sensitive adhesive sheet according to claim 1, wherein 50% or more of the hook-shaped portion in contact with the adherend has a hollow portion inside and an opening on the upper surface.  3. The pressure-sensitive adhesive sheet according to claim 1 or 2, wherein the total of the bottom surfaces of the convex portions in contact with the adherend is 10 to 90% of the pressure-sensitive adhesive layer.  4. The shape of the convex part in contact with the adherend is a substantially semi-circular or nearly blue circle with a height of 5 to 250 μπι, and is substantially hemispherical. The diameter of the bottom is 50 to 1500 μηι. Yes, which is a rough blue circle, the bottom of the major axis is 100-2000μπι, the minor axis is 50-: L OOO / im. 5. The pressure-sensitive adhesive sheet according to claim 1, wherein: between the convex portions in contact with the adherend, between adjacent convex portions is:! To 2000 μπι.  6. The adhesive sheet according to any one of claims 5 to 5, wherein the age and the thickness of the pressure-sensitive adhesive layer bonded to the adherend are 5 to 200 μηι.  7. Claims 1-6, or f froze-free adhesive sheet: a surface having a concave copy surface on the surface ¾1 force S In addition, after forming a J »adhesive layer that is smaller than the depth of the concave portion in the above-mentioned concave shape, a rice-occupied sheet is used to paste a £ t-old sheet on the octopus occupant layer. of