KR101320300B1 - Pressure-sensitive adhesive sheet with air-eliminable channels - Google Patents

Abstract

PURPOSE: A pressure-sensitive adhesive sheet is provided to enhance adhesive by having excellent air emission property of interface during construction and to obtain exterior uniformity and smoothness. CONSTITUTION: A pressure-sensitive adhesive sheet comprises an adhesive layer (2), a base film (3) which are successively combined on a release paper (1) surface. The pressure-sensitive adhesive sheet forms an embossed grating pattern in a rhomboidal shape on the release paper by using a roll press and forms air drainage channels (W) in a pattern same as the grating pattern on the adhesive surface welded on the release paper. The gap between the air drainage channel and adjacent air drainage channel is 0.5-1.0 mm. The total volume of the air drainage channel includes 1×10^5 - 1×10^6 um^3 of inner space based on 1 mm^2 of the adhesive layer area.

Description

Pressure-sensitive adhesive sheet with air discharge passage {Pressure-sensitive adhesive sheet with air-eliminable channels}

The present invention relates to a pressure-sensitive adhesive sheet having an air discharge passage, and more particularly, in an adhesive sheet formed by combining an adhesive layer and a base film on a surface of a release paper, an embossed lattice pattern is formed on an inner surface of the release paper. The air discharge passage is provided on the adhesive layer, so that the air discharge property of the interface is good when constructing the adhesive sheet, so that the adhesive strength is excellent and the appearance uniformity and smoothness can be guaranteed. It is a self-adhesive sheet that is easy to attach to, and its surface is smooth to prevent the adsorption of pollutants. Therefore, it is not only useful for decorating the exterior of automobiles or the surface of substrates, but also for reflecting sheets, advertising films, architectural finishing films, Pressure-sensitive adhesive sheet that can be applied to many fields such as interior film, protective film, label and tape. It is about.

In general, self-adhesive films used in various applications are mainly adhered to a substrate by pressure-sensitive adhesives, for example, to the surfaces of various substrates including the appearance of automobiles. In such an adhesive film, the interface between the adhesive and the contact surface of the substrate plays an important role in the performance of the film, and the interface between the adhesive and the substrate is determined by the type of adhesive used, the size and type of film used, and the It is influenced by factors such as the surface condition, the application technique used and combinations thereof.

The adhesive adhesive film as described above, that is, the adhesive sheet is attached in contact with the surface of the substrate, but if it is inadvertently attached to the substrate, it is difficult to reattach, so the surface of the adhesive sheet attached to the substrate is not smooth, and then repositioning is attempted after the adhesion. In this case, the adhesive sheet may be damaged or adversely affect the adhesive performance. In order to manufacture such an adhesive sheet, a base film is produced by extrusion, rolling, or casting according to a material such as synthetic resin or aluminum, and then an adhesive is coated on a separate release paper, and an adhesive coated surface and the base film are laminated. To produce.

However, the adhesive sheet having such a smooth surface, especially in the case of a film made of a flexible material such as soft PVC, does not allow air to be discharged between the adhered surface and the adhesive during attachment to the adhered surface, resulting in swelling of the surface of the sheet, resulting in poor appearance. It may occur, and due to the thermal expansion of air that is not discharged even after bonding, the adhesion area between the adhered surfaces is reduced, resulting in a decrease in adhesion force.

In order to solve such a problem, conventionally, a glass, an inorganic material, and a metal component, which are not adhered to a continuous adhesive layer, are placed on the surface of the adhesive to allow the position of the sheet to be adjusted, and at the same time, to provide easy air discharge. Efforts have been made to solve the problem by providing a passageway through which air can be discharged to the surface of the furnace.

As described above, when the discontinuous adhesive layer in the adhesive sheet is formed on the base film, the portion without the adhesive at the time of construction may serve as a passage for allowing air removal. In general, a method of forming a discontinuous adhesive layer is formed by applying an adhesive on a film in a pattern form by printing or spraying. Another method is to adjust the surface shape of the siliconized surface in the release paper or the release film so that the shape is transferred to the adhesive surface so that air is easily removed through the passage formed.

Looking at the prior art with respect to the present invention, Japanese Unexamined Patent Publication No. 6-212131 (published date: 1994. 08. 02) also gives an uneven surface on the surface of the continuous pressure-sensitive adhesive to facilitate air removal and sheet repositioning Improved. In particular, in the present invention, the height of the uneven portion is 10 to 20 µm, the bottom width is 50 to 100 µm, and the upper flat surface width of the uneven portion is formed to 50 to 100 µm to provide a decorative adhesive sheet capable of re-peeling.

US Patent No. 5,650,215 (Registration Date: July 22, 1997) discloses an adhesive tape and a transition coating comprising a continuous pressure-sensitive adhesive layer having a fine surface structure comprising a series of patterns having a pattern side aspect ratio of about 0.1 to 10. Mention was made regarding the manufacture of such products. Microstructure means that at least two of the height, width and length must be in mesh units, and products including adhesive tapes and transition coatings into which the microstructures have been introduced have been able to achieve initial relocation. In addition, US Pat. No. 6,197,397 (registered date: Mar. 06, 2001) formed a microreplicated adhesive surface with both microchannels for outflow of fluid and pegs for improved adhesion properties. The micro-embossed pattern is composed of a microchannel for the outflow of the fluid and a recess into which the non-sticky material can enter, so that the air can be easily removed and the relocation property is improved.

And US Pat. No. 6,524,675 (registered date: Feb. 25, 2003) limited the volume of the air removing channel formed by the microstructure to 1 × 10 ³ μm ³ or more per circle area of 500 μm in diameter of the adhesive. In addition, in order to satisfy the above conditions, the pitch of the pattern was limited to 400 μm or less so that the uneven shape did not appear on the entire surface of the sheet after attachment. In addition, U.S. Patent No. 6,630,218 (Registration Date: Oct. 7, 2003) coated a pressure-sensitive adhesive on a flat-type release paper and laminating it with a sheet to store the flat shape in the pressure-sensitive adhesive, then removing the release paper and laminating with a release paper having an uneven structure. To give a concave-convex structure to the surface of the pressure-sensitive adhesive. After the release paper is removed, the uneven structure disappears by returning to the flat structure already remembered due to the elasticity of the crosslinked pressure-sensitive adhesive, and the adhesive area is secured at more than 92% after 48 hours at 25 ° C. A method of preventing the glyphs from bleeding into the sheet surface has been proposed.

In Korea prior art, in the patent No. 0253460 (Registration Date: 2000. 01. 24), the adhesive construction of conventional adhesive sheets by embossing a continuous line of embossed in the horizontal and vertical direction on the surface to be coated with the adhesive of the adhesive release paper Disclosed is a technique for a pressure-sensitive release paper and a pressure-sensitive adhesive sheet product using the release paper to solve the inconvenience of the construction due to the swelling of the sheet layer to improve the workability.

In addition, Patent No. 0654256 (registered date: Nov. 29, 2006) discloses a compliant polymer film having an upper surface and a lower surface, and having an inelastic deformation of at least 5% once drawn to 115% of its original length; And permanently bonded to the bottom surface of the compliant polymer film and opposite the film to the substrate and having a volume of 1 × 10 ³ μm ³ to 1 × 10 ⁷ μm ³ per circle area of any 500 μm diameter. A pressure-sensitive adhesive having a microstructured surface having a defined pattern of channels formed thereon, and after the final application to the substrate, the upper surface of the compliant film is substantially periodic and when subjected to surface roughness testing procedures. Surface roughness has an appearance that is substantially below the surface roughness of the film itself, and the channel discloses a technique for adhesive-backed decorative articles that is substantially undetectable at the top surface of the compliant film.

In addition, Patent No. 0709746 (Registration Date: Apr. 13, 2007) includes a base film and an adhesive layer, and a first step having a height of 3 to 10 μm and a width of 10 to 30 μm on the surface of the pressure sensitive adhesive layer. The passage and the second stage passages having a height of 10 to 20 μm and the width of 30 to 60 μm are connected to each other, and the first stage passage is formed between the second stage passages each having a distance of 2 to 4 mm. A pressure-sensitive adhesive sheet having a multi-stage air discharge passage is known, and due to this configuration, the first stage passage is formed in a short period of time by forming a low height first stage passage and a high height second stage passage connected to the adhesive layer. It acts as a short-distance air exhaust passage and disappears to secure a wider contact area, and the second stage passage serves as a longer-term air exhaust passage, resulting in improved constructability. Prevent the passage from the sheet surface at the time of the pattern is baeeona the front sheet to provide a functional effect of improving the appearance.

As described above, in the technical field, various attempts have been made to form a fine passage through which air can be discharged to the surface of the adhesive layer (or the adhesive layer) when the sheet is manufactured, and the use of the adhesive sheet is expanded to various fields. Accordingly, there has been a continuous demand for improvement of a method for forming a new adhesive layer in accordance with the development of related fields such as the type of the base film and the component of the adhesive.

Accordingly, the applicant of the present invention by applying the adhesive in a pattern shape to the base film by the screen printing method to form an air discharge passage to smoothly discharge the air from between the adhered surface and the adhesive layer during the adhesive sheet construction of the adhesive sheet Pressure-sensitive property that improves workability and prevents bending of the sheet surface, and maximizes adhesion by increasing the effective adhesion area of the adhesive layer to the adhered surface, as well as improves the surface appearance and smoothness and adhesion of the film after construction. The adhesive sheet has been developed, and the technology has been registered as Patent No. 10-1108596 (Registration Date: 2012. 01. 16.) has come to be useful.

Meanwhile, in the present invention, as a result of intensive analysis of the microstructure of the air discharge passage formed in the adhesive layer in the conventional pressure-sensitive adhesive sheet, the height, width, spacing of the air discharge passage is best By deriving a unique pattern shape by limiting to an appropriate numerical range, it is possible to ensure not only good air discharge to the interface when working with the adhesive sheet on the surface of the substrate, but also excellent workability and adhesion, as well as uniformity and smoothness of appearance. The present invention has been completed by focusing on the fact that it can be used.

Japanese Patent Laid-Open No. 6-212131 (published date: 1994. 08. 02) U.S. Patent Publication No. 5,650,215 (Registration Date: July 22, 1997) U.S. Patent No. 6,197,397 (Registration Date: 2001. 03. 06) U.S. Patent Publication No. 6,524,675 (Registration Date: Feb. 25, 2003) U.S. Patent Publication No. 6,630,218 (Registration Date: 2003. 10. 07) Republic of Korea Patent Publication No. 10-0253460 (Registration Date: 2000. 01. 24) Republic of Korea Patent Publication No. 10-0654256 (Registration Date: November 29, 2006) Republic of Korea Patent Publication No. 10-0709746 (Registration Date: April 13, 2007)

An object of the present invention is to form a regular embossed lattice pattern on the inner surface of the release paper and apply the adhesive thereon to an appropriate thickness, and then to bond the back surface of the base film to the adhesive coating surface of the release paper is limited to the bonding surface of the adhesive layer By forming an air discharge passage having an internal space, when the release paper is removed and the adhesive sheet is bonded to the adhered surface, air is smoothly discharged between the adhered surface and the adhesive layer, so that the workability and construction quality are excellent. It is to provide an adhesive sheet.

Another object of the present invention is the air discharge passage formed in the groove portion formed in the adhesive layer attached to the back surface of the base film is connected in a lattice shape, the air discharge to the interface is good to ensure excellent adhesion and uniformity of appearance In addition, the adhesive sheet is easy to attach on a flat surface as well as curved surfaces without a separate adhesive auxiliary material, and improves durability of the adhesive sheet, and prevents the effective adhesive area of the adhesive layer from being reduced by the air discharge passage during the construction of the adhesive sheet. Thus, a pressure-sensitive adhesive sheet having improved adhesive strength and surface smoothness is provided.

In the pressure-sensitive adhesive sheet having an air discharge passage of the present invention for solving the above problems, the pressure-sensitive adhesive sheet formed by sequentially bonding the adhesive layer (2), the base film (3) to the surface of the release paper (1) In the present invention, the inner surface treated with the release agent of the release paper 1 is formed using a roll press to form a grid pattern embossed with a height of 5 to 8 μm and a width of 40 to 70 μm in a rhombus shape to bond with the release paper 1. On the surface of the adhesive layer 2 to form an air discharge passage (W) having the same pattern as the grid pattern, the air discharge passage (W) is 0.5 to 1.0 distance from the adjacent air discharge passage (W) Mm, the total volume of the air discharge passage (W) is characterized in that the internal space is limited to 1 × 10 ⁵ ~ 1 × 10 ⁶ ㎛ ³ based on the area 1 mm 2 of the adhesive layer (2).

In addition, the air discharge passage (W) formed in the adhesive layer (2) is any one selected from the shape of the cross-section of the cross-section, triangular, rectangular, trapezoidal, round shape, the thickness of the adhesive layer 2 is 10 ~ 50㎛. . The base film 3 is selected from synthetic resin, paper or metal thin film, and has an unevenness having roughness (roughness) of 1 to 10 μm on the entire inner surface thereof. In one embodiment, the release paper 1 is treated with a release agent on both sides thereof to form the same embossed lattice pattern, and then the adhesive layer 2 and the base film 3 are sequentially bonded to both sides of the release paper 1. It may be configured.

In addition, according to a preferred feature of the present invention, the air discharge passage (W) formed in the adhesive layer (2) is the first air discharge passage (W1) and the second air discharge passage (W2) are alternately arranged to have a rhombus shape Form a grid pattern, wherein the first air discharge passage (W1) is made of 5 ~ 8㎛ height, 40 ~ 50㎛ in width, the second air discharge passage (W2) is 5 ~ 8㎛ height, 60 ~ width It consists of 70 micrometers.

The pressure-sensitive adhesive sheet having the air discharge passage of the present invention forms a regular embossed lattice pattern on the inner surface of the release paper by a roll press, and then, the adhesive is applied to an appropriate thickness thereon, and then the base film is applied to the adhesive application surface of the release paper. By bonding the back surface to form an air discharge passage having an internal space limited to the adhesive layer, when the release paper is removed and the adhesive sheet is bonded to the adhered surface, air is smoothly discharged between the adhered surface and the adhesive layer, so that workability is improved. It is good and there is an effect of improving the adhesive strength of the film to improve the durability of the adhesive sheet.

In addition, in the adhesive sheet of the present invention, the air discharge passages formed on the adhesive layer attached to the rear surface of the base film are connected to each other in a lattice shape, so that the air discharge property to the interface is good and the adhesive force is excellent, and the area ratio of the air discharge passage is It is designed to be 10 ~ 15% based on the total area of the adhesive layer, which is as low as possible compared to the prior art, and improves the smoothness of the adhesive layer by the air discharge passage during the construction of the adhesive sheet, thereby ensuring the uniform appearance of the adhesive sheet surface. have.

1 is a perspective view showing the shape of the air discharge passage formed in the adhesive layer of the adhesive sheet according to the present invention
Figure 2a is a plan view of an embodiment showing the shape of the air discharge passage formed in the adhesive layer of the adhesive sheet according to the present invention
Figure 2b is a plan view of another embodiment showing the shape of the air discharge passage formed in the adhesive layer of the adhesive sheet according to the present invention
Figure 3a to Figure 3d is a cross-sectional view showing the shape of the air discharge passage formed in the adhesive sheet according to the present invention
Figure 4a is a cross-sectional view of an embodiment showing the structure of the adhesive sheet according to the present invention
Figure 4b is a cross-sectional view of another embodiment showing the structure of the adhesive sheet according to the present invention
5 is a cross-sectional view showing a state of use of the adhesive sheet according to the present invention.

Hereinafter will be described with respect to the pressure-sensitive adhesive sheet according to the present invention with reference to the drawings, which is intended to illustrate to the extent that it can be easily carried out self-invention having ordinary skill in the art to which the present invention belongs, This does not mean that the technical spirit and scope of the present invention is limited.

In the pressure-sensitive adhesive sheet having an air discharge passage according to the present invention, in the pressure-sensitive adhesive sheet configured by sequentially bonding the adhesive layer 2 and the base film 3 to the surface of the release paper 1, the release paper 1 The adhesive layer (2) bonded to the release paper (1) by forming a lattice pattern embossed lattice pattern having a height of 5 ~ 8㎛, 40 ~ 70㎛ width using a roll press on the inner surface treated with a release agent The air discharge passage (W) is formed on the surface of the same pattern as the grid pattern, wherein the air discharge passage (W) is 0.5 to 1.0mm apart from the adjacent air discharge passage (W), the air discharge passage ( The total volume of W) is provided with an internal space defined as 1 × 10 ⁵ to 1 × 10 ⁶ μm ³ based on 1 mm 2 of the adhesive layer 2.

In order to manufacture the adhesive sheet of the present invention, after the base film 3 is manufactured, the adhesive 2 is coated on the release paper 1, and the surface coated with the adhesive and the base film 3 are laminated.

The release paper 1 used in the pressure-sensitive adhesive sheet of the present invention is used by treating a release agent so that peeling from an adhesive is easy during construction. The releasing agent is mainly a siloxane skeleton in which silicon atoms and carbon atoms are bonded, and polysiloxanes having a structure in which a methyl group and an organic group of phenol groups are bonded to silicon atoms dominate the majority. The release agent is coated with a silicone diluent on the surface of the substrate, and dried and cured. The substrate used for the release paper 1 is preferably made of a small amount of silicon to reduce the penetration of silicon into the substrate and smooth the surface in order to obtain excellent peeling performance. Generally, the substrate used for the release paper 1 varies depending on the application, but is mainly polylaminate paper, glass paper, kraft paper, clay coat paper, synthetic paper, aluminum foil, various plastic films, and the like. In particular, recently, a transparent plastic film having a smooth and strong strength without getting wet has been used a lot. Release paper for kraft adhesive tape is designed by extruded and coated an olefin resin such as polyethylene and polypropylene on one side using kraft paper weighing 70 g / cm 2 as a base material, and then a release treatment layer was applied to the resin based on silicone resin. It is. The release paper for double-sided adhesive tape can be variously used, such as a conventional waste paper as an adhesive support, a product using an adhesive alone without a support, or using various films as an adhesive support.

The release paper 1 as described above is excellent in the smoothness of the surface on which the adhesive is coated, because the uniform coating of the adhesive when the adhesive is coated on the release paper (1) to uniform the adhesive strength during construction give. The base material used in the construction of the adhesive sheet according to the present invention is made of a material such as metals, fibers, plastics, stones, glass, wood, such adhesive sheet is made of a desired letter or shape, and then bonded to the release paper (1) After peeling from a sheet, it adheres to a base material. At this time, fine bubbles are generated at the interface between the adhesive layer 2 and the substrate so that air does not completely escape, resulting in swelling of the base film 3, resulting in poor construction, such as smoothness of the appearance and deterioration of adhesive strength. .

Accordingly, in the present invention, by forming the air discharge passage (W) in the adhesive layer (2) by embossing the release paper (1) treated with the release agent in a lattice form with a roll press to be connected to each other at the time of sheet work The air of the adhesive interface can be smoothly discharged to the outside.

That is, the release paper 1 forms a lattice pattern embossed with a height of 5 to 8 μm and a width of 40 to 70 μm using a roll press on both surfaces of the release paper 1, and then on both sides of the release paper 1. The air discharge passage (W) was formed in the adhesive layer (2), which lowers the height and slightly expands the width to strengthen the adhesive force, and the air discharge passage (W) is adjacent to the air discharge passage. The spacing with (W) of 0.5 to 1.0 mm allows for more precise design of the uniformity of appearance. Because of this, the total volume of the air discharge passage (W) formed in the adhesive sheet of the present invention is provided with an internal space limited to 1 × 10 ⁵ ~ 1 × 10 ⁶ ㎛ ³ based on the area 1 mm 2 of the adhesive layer (2) Is done.

According to the present inventors study, the release paper 1 forms an air discharge passage W in the adhesive layer 2 according to the concavo-convex pattern on the inner surface thereof, and the height of the relief formed on the release paper 1 is 5 Formation of about-8 μm ensures uniformity of appearance of the adhesive sheet. If it is formed at a height smaller than 5 μm, the air discharge path may not be sufficiently exerted, resulting in poor air release properties. If the thickness is larger than 8 μm, the intaglio between the adhesive layers that form the pattern may be difficult to adhere to the adhered surface. Since the state occurs, fine bends may be formed on the surface of the adhesive sheet to not uniformly maintain the appearance of the product, and the durability of the adhesive sheet may be weakened due to the weakening of the adhesive force, and the pattern may be reflected on the outer surface of the adhesive sheet. In addition, the matters relating to the width of the reliefs formed on the release paper 1 were also formed in the range of 40 to 70 μm in consideration of air discharge, adhesive force, and appearance uniformity in the same manner as the reason for limiting the height.

In addition, the embossed lattice pattern formed on the plane of the release paper 1 has a rhombus shape as a whole, so that the air discharge passage W formed on the plane of the adhesive layer 2 also has the same rhombus as the release paper 1. Of course, it is formed in the shape of the shape is good air discharge during construction of the adhesive sheet is of course. The shape of the air discharge passage (W) is made of any one selected from the shape of the cross section of the general triangular, square, trapezoidal, round shape, which is directly the precision and workability of the roll press embossing the release paper (1) There is no particular limitation on the shape as it is related.

And the air discharge passage (W) is formed at regular intervals with a distance between the adjacent air discharge passage (W) is 0.5 ~ 1.0mm, which is designed more densely than the conventional products, the adhered surface and the adhesive during the construction of the adhesive sheet The microbubbles present between the layers 2 are easily removed, so that the air release property is not only good, and the effective adhesion area is prevented from being reduced, thereby increasing the area of the base film 3 adhering to the adherend 4. Let's go. As a result, the adhesive force of the adhesive sheet becomes more excellent, and uniformity of appearance can be improved.

According to one embodiment of the present invention, the adhesive sheet is treated with a release agent on both sides of the release paper 1, and then formed the same embossed lattice pattern by the embossing operation by a roll press on both sides of the release paper (1) By bonding the adhesive layer 2 and the base film 3 sequentially on both sides, it can also be comprised by the adhesive sheet of the form laminated | stacked in two stages.

As described above, the total volume of the air discharge passage W in the adhesive sheet of the present invention is set to be very precisely limited to about 1 × 10 ⁵ to 1 × 10 ⁶ μm ³ based on the area of 1 mm 2 of the adhesive layer 2. By doing so, it is possible to meet complete air discharge, appearance, and best adhesion and durability at the same time.

From this, the adhesive sheet of the present invention, when the release paper 1 is removed and bonded to the adhered surface, air is smoothly discharged between the adhered surface and the adhesive layer 2, so that the workability is good and the adhesive strength of the film is improved. It has the effect of improving the durability of the sheet, and the area ratio of the air discharge passage (W) is about 10 to 15% based on the total area of the adhesive layer (2). The smoothness of the adhesive layer 2 by the discharge passage W is improved to make the external appearance of the adhesive sheet surface uniform.

In the present invention, the numerical range represents an optimal result obtained through numerous experiments, but various modifications and changes can be made without departing from the spirit and scope of the present invention. In the air discharge passage W formed in the adhesive layer 2, the first air discharge passage W1 and the second air discharge passage W2 having different widths are arranged in alternating manner. 1 The air discharge passage (W1) is made of 5 ~ 8㎛ height, 40 ~ 50㎛ in height and the second air discharge passage (W2) is made of 5 ~ 8㎛ height, 60 ~ 70㎛ width, the adhesive sheet construction The parallax at which the first air discharge passage W1 and the second air discharge passage W2 are extinguished is adjusted to improve air discharge at the interface, thereby enhancing the bonding force to the adherend 4 and at the same time the sheet surface. That the pattern is oozing out Not to guarantee the uniformity and smoothness of appearance, and this adhesive sheet is plane without a separate adhesive, as well as the auxiliary material is good in adhesion to the surface.

In addition, the pressure-sensitive adhesive used in the adhesive layer (2) of the present invention is selected based on the type and state of the substrate to be bonded, such as acrylic, rubber, ethylene vinyl acetate and silicone is used a lot have. The thickness of the adhesive layer 2 depends on several factors including the components of the adhesive, the type of substrate to be bonded and the thickness of the base film. It is possible for a person skilled in the art to adjust the thickness according to a specific use and the said factor, and it is preferable to apply the adhesive bond layer 2 to the thickness of about 10-50 micrometers normally.

The base film 3 may use any one selected from synthetic resin, paper, or metal thin film according to a specific use. Generally, a film used by a person skilled in the art may be polyvinyl chloride or plasticized. Synthetic resin films such as polyvinyl chloride, polyurethane, polyethylene, polypropylene, and the like, and various metal films or metal deposition films. The thickness of the film can vary greatly depending on the desired application but is generally in the range of about 300 μm or less, preferably 25 μm to 100 μm. In addition, the base film 3 is preferably molded so that irregularities are formed uniformly with roughness (roughness) of 1 to 10 μm over the entire back surface of the film in order to strengthen bonding with the adhesive. As the filling property of the adhesive bonded to the back surface base film 3 decreases, the adhesive strength and surface smoothness of the adhesive sheet become poor after construction, and if the size of the unevenness is too fine, the adhesive layer 2 to the base film 3 ), The bonding strength of the c) is weakened, and therefore, it is preferable that irregularities having roughness (roughness) of 1 to 10 µm are formed evenly on the back surface of the base film 3.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention.

After preparing the base film (3) formed uniformly with irregularities having a roughness of 1 ~ 10㎛ on the entire back surface of the film, using a roll press to form an air discharge passage (W) in the adhesive layer (2) 1) The embossed pattern was formed so that height, width, and space | interval might be 6 micrometer / 60 micrometer / 0.5 mm, respectively. Thereafter, an acrylic adhesive was applied on the release paper 1 to a thickness of about 30 to 40 μm and dried to form an adhesive layer 2, and then the back surface of the base film 3 was bonded to prepare an adhesive sheet.

The embossed pattern formed on the release paper 1 using a roll press was prepared in the same manner as in Example 1 except that the height, width, and spacing were set to 7 μm / 50 μm / 0.8 mm, respectively. .

The embossed pattern formed on the release paper 1 using a roll press was arranged such that the first air discharge passage W1 and the second air discharge passage W2 were alternately arranged. An adhesive sheet was prepared in the same manner as in Example 1, except that the thickness was set to μm / 50 μm / 0.5 mm and 7 μm / 60 μm / 0.5 mm.

The embossed pattern formed on the release paper 1 by using a roll press was arranged such that the first air discharge passage W1 and the second air discharge passage W2 were alternately arranged. An adhesive sheet was produced in the same manner as in Example 1 except that the thickness was set to 탆 / 40 탆 /0.8 mm and 8 탆 / 70 탆 /0.8 mm.

≪ Comparative Example 1 &

An adhesive sheet was prepared in the same manner as in Example 1, except that the adhesive layer 2 was formed without forming an embossed pattern on the release paper 1.

Comparative Example 2

The embossed pattern formed on the release paper 1 using a roll press was prepared in the same manner as in Example 1 except that the height, width, and spacing were set to 6 µm / 60 µm / 2.0 mm, respectively. It was.

≪ Comparative Example 3 &

The embossed pattern formed on the release paper 1 using a roll press was prepared in the same manner as in Example 1 except that the height, width, and spacing were each 10 μm / 80 μm / 4.0 mm. It was.

<Experimental Example>

The adhesive sheets prepared according to Examples 1 to 4 and the adhesive sheets prepared according to Comparative Examples 1 to 3 were removed under the same conditions, and the release paper 1 was detached and attached to an acrylic plate, for each adhesive sheet. Adhesion, air discharge and appearance uniformity were measured several times, and the average value of the results is shown in Table 2 below.

[Evaluation of film appearance after construction]

A test sample was prepared at 20 × 20 cm and attached to a transparent acrylic plate using squeeze. Emission characteristics of the air mixed at the time of adhesion and the surface state of the film after the deposition for 24 hours were evaluated by dividing as shown in [Table 1] below.

division Air exhaust Surface Condition of Adhesive Sheet Prize Complete removal of mixed bubbles The pattern by the glue pattern cannot be discriminated with the naked eye. medium Fine bubbles are removable but large bubbles are not removed Pattern occurrence due to adhesive pattern Ha Many bubbles are incorporated and cannot be removed Visually distinguish patterns by adhesive patterns

[Adhesion evaluation]

Adhesion evaluation was used for the tensile adhesion test method. The test sample preparation and the attachment method to the adherend (4) were in accordance with the test method of KS A1107, the adhesion evaluation was carried out to test the results after 24 hours after attachment.

After fixing the base film 3 on the flat glass plate, Mitutoyo's SURFTEST 301 roughness meter was used. The pattern of the intaglio was determined from the graph read as the needle of the illuminometer moved on the film, and the width and the interval of the air discharge passage W were respectively determined.

[Test result]

division Of air exhaust passage (W)
Height (μm) / Width (μm) / Spacing (mm)
Adhesion
(Kgf / in ² )
Air exhaust
Appearance uniformity Air discharge passage (W1) Air discharge passage (W2) Example 1 6/60 / 0.5 6/60 / 0.5 2.8 2.0 Prize Example 2 7/50 / 0.8 7/50 / 0.8 3.0 2.3 Prize Example 3 6/50 / 0.5 7/60 / 0.5 3.2 2.5 Prize Example 4 5/40 / 0.8 8/70 / 0.8 3.1 2.4 Prize Comparative Example 1 - - 2.2 1.2 Ha Comparative Example 2 6/60 / 2.0 6/60 / 2.0 2.5 1.9 medium Comparative Example 3 10/80 / 4.0 10/80 / 4.0 2.4 1.7 Ha

In the results of Table 2, the adhesive sheet according to Comparative Example 1 in which the embossed pattern (air discharge passage) was not formed on the release paper 1 was bubbled due to air mixed in the adhesive layer 2. The appearance and adhesion after the attachment were the worst. In addition, compared with Comparative Example 1, the adhesive sheet according to Comparative Example 2 was more easily prevented from entering the air, but the pattern of the adhesive layer 2 was slightly exposed to the outside of the sheet due to the slightly wider space of the air discharge passage (W). , The adhesive force with the substrate after 24 hours was superior to about 10% compared to Comparative Example 1. In Comparative Example 3, although the adhesive force is relatively high and the air dischargeability is superior to Comparative Example 1, the height and spacing of the air discharge passage W are too large as 10 μm and 4.0 mm, respectively, so that the pattern of the adhesive layer 2 is outside the sheet. The appearance uniformity was somewhat poor. In addition, when the width of the air discharge passage (W) is less than 40㎛ or more than 80㎛ it was found that the air discharge of the adhesive layer (2) is not effective, which means that even if the worker has difficulty in construction, the adhesive force is reduced if the air bubbles are reduced. It could be confirmed that it is maintained to some extent.

On the other hand, according to Examples 1 to 4 manufactured by the present invention, the height of the air discharge passage (W) in order to prevent the pattern by the adhesive pattern is visually confirmed from the outside of the adhesive sheet after attaching the adhesive sheet It is preferable to form within 8 μm and the width within 70 μm, and more preferably, the second air discharge passage W2 having a different height and width between the first air discharge passage W1 as in the third embodiment and the fourth embodiment. By alternately forming), the parallax of dissipation of the second air discharge passage W2 from the first air discharge passage W1 at the time of the adhesive sheet construction is momentarily delayed, resulting in better air discharge at the interface and Bond strength is enhanced. In addition, the distance between the adjacent air discharge passages (W) is less than 1.0mm, that is to form the length of one side of the lattice pattern in the shape of a rhombus in the adhesive layer 2 to approximately 0.5 ~ 1.0mm to construct the adhesive sheet It was also confirmed that air mixing was prevented at the time, so that the appearance and adhesion of the sheet were improved.

Therefore, the pressure-sensitive adhesive sheet having the air discharge passage of the present invention is a self-adhesive sheet which has a smooth surface to prevent adsorption of contaminants, and is particularly useful for decorating the exterior of a vehicle or the surface of a substrate, as well as a reflective sheet. In the field of advertising, film for building finishing, interior film, protective film, label and tape exhibits a significantly different quality compared to existing products, by those skilled in the art without departing from the spirit of the present invention It can be substituted, modified and changed in various ways and can be used in various uses and forms.

1: release paper 2: adhesive layer
3: base film 4: adherend
W: Air exhaust passage W1: First air exhaust passage
W2: second air discharge passage

Claims (8)

In the pressure-sensitive adhesive sheet formed by sequentially bonding the adhesive layer 2 and the base film 3 on the surface of the release paper 1,
The adhesive is bonded to the release paper 1 by forming a grid pattern embossed at a height of 5 to 8 μm and a width of 40 to 70 μm using a roll press to a rhombus shape on the inner surface treated with the release agent of the release paper 1. On the surface of the layer 2 to form an air discharge passage (W) having the same pattern as the grid pattern,
The air discharge passage (W) is 0.5 to 1.0 mm apart from an adjacent air discharge passage (W), and the total volume of the air discharge passage (W) is 1 × 10 based on an area of 1 mm 2 of the adhesive layer (2). A pressure-sensitive adhesive sheet having an air discharge passage, characterized in that the inner space is provided limited to ⁵ ~ 1 × 10 ⁶ ㎛ ³ . delete The method of claim 1,
The air discharge passage (W) formed in the adhesive layer (2) is a pressure-sensitive adhesive sheet having an air discharge passage, characterized in that the cross-sectional shape is any one selected from triangular, square, trapezoidal, round. The method of claim 1,
Pressure-sensitive adhesive sheet with an air discharge passage, characterized in that the thickness of the adhesive layer (2) is 10 ~ 50㎛. The method of claim 1,
The base film (3) is a pressure-sensitive adhesive sheet having an air discharge passage, characterized in that any one selected from synthetic resin, paper or metal thin film. The method of claim 1,
The base film (3) is a pressure-sensitive adhesive sheet having an air discharge passage, characterized in that irregularities having roughness (roughness) of 1 ~ 10㎛ on the entire inner surface. 7. The method according to any one of claims 1 to 6,
The release paper 1 forms an embossed lattice pattern having a height of 5 to 8 μm and a width of 40 to 70 μm using a roll press on both surfaces of the release paper 1, and then an adhesive layer on both sides of the release paper 1. A pressure-sensitive adhesive sheet having an air discharge passage, characterized in that (2) and the base film (3) is configured by sequentially combining. 7. The method according to any one of claims 1 to 6,
The air discharge passage (W) formed in the adhesive layer (2) is the first air discharge passage (W1) and the second air discharge passage (W2) are alternately arranged to form a rhombus grid pattern, the first Air discharge passage (W1) is made of a height of 5 ~ 8㎛, width 40 ~ 50㎛, the second air discharge passage (W2) is characterized in that the air consisting of 5 ~ 8㎛ height, 60 ~ 70㎛ width Pressure-sensitive adhesive sheet having a discharge passage.

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