JPS617373A - Adhesive sheet and production thereof - Google Patents

Abstract

PURPOSE:To obtain the titled sheet suitable for thin wall and ultrathin surfacing without deterioration by heat, by coating an adhesive layer formed on the surface of a peelable base material with a radiation curing resin solution, and irradiating the resultant coat with radiation to give a cured resin film. CONSTITUTION:An adhesive sheet obtained by coating the top surface of a peelable base material 1 with an adhesive coating solution to form an adhesive layer 2, coating the top surface of the layer 2 with a radiation curing resin solution, irradiating the resultant coat with radiation to form a cured resin film 3 as a surface layer. Alternatively, the top surface of the peelable base material 1 is coated with the radiation curing resin solution, and the resultant layer is then irradiated with radiation to form a radiation cured resin film 3. The resultant constituent base material (A) may be opposed to a constituent base material (B) obtained by coating the surface of another peelable base material 1 with an adhesive solution, and drying the resultant coat to form an adhesive layer at the surface of the radiation cured resin film 3 and the adhesive layer surface to each other and superposed.

Description

[Detailed description of the invention] The present invention relates to a novel pressure-sensitive adhesive sheet and a method for manufacturing the same.

In recent years, there has been a demand for thin adhesive sheets for use as decorative adhesive sheets for signboards and automobiles, such that the surface to be decorated looks like a painted surface. In order to meet this requirement, an ultra-thin synthetic resin film alone is coated with an adhesive solution on the top surface of release paper, and then dried and polymerized on the top surface of the adhesive layer to form an adhesive solution, and then the synthetic resin film is applied to the bottom surface of the film. Either the adhesive layer is manufactured by applying an adhesive coating liquid to one side of the synthetic resin film alone and drying, and then a release paper is temporarily pasted on the upper surface of the adhesive layer, rather than directly providing the adhesive layer. However, in either case, the ultra-thin synthetic resin film has stretchability and elasticity and low strength, so it is difficult to obtain a smooth adhesive sheet because of tearing or wrinkles during the manufacturing process. It has disadvantages that cannot be avoided. In addition, an adhesive coating liquid is applied to the upper surface of the release paper to form an adhesive layer, and a synthetic resin powder or a synthetic resin composition powder is powder coated on the adhesive layer bait, and the coating layer is heated and melted to harden to form a cured resin layer. When forming a film, it is difficult to obtain an extremely thin film. It is extremely difficult to apply the powder uniformly without using d or p, which has drawbacks, and it requires heating at 150℃ for several to 10 minutes to melt and harden it, so thermal deterioration of the adhesive can occur. J11 as an adhesive sheet! This is accompanied by disadvantages such as loss of structure and lack of permeability as an adhesive sheet when used.

Considering the above circumstances, this newly developed BA ore has adhesive properties that are the first of its kind, and is especially suitable for thin and ultra-thin surfaces.
1-It is provided and consists of a sequential laminate of a releasable base material, an adhesive layer, and a radiation-curable resin film.

In consideration of the above-mentioned circumstances, the present invention also provides a decorative film that does not require high-temperature heating and can form a thin or extremely thin synthetic resin film on the top surface of the adhesive layer without tearing or wrinkles. This method provides a method for manufacturing adhesive sheets suitable for applications such as coatings, in which a radiation-curable Zm resin liquid is applied to the adhesive layer formed on the surface of a removable base material, and then the liquid film is irradiated with radiation to cure it. It is assumed that the radiation cured resin film is made into a radiation cured resin film.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 1 shows an example of the implementation of the present invention (IJ is a 7'C releasable base made by surface-treating relatively thick paper or film with a release agent such as silicone resin, and (2) is a rubber-based releasable base material. According to the present invention, the adhesive coating layer (3) is obtained by drying a coating liquid of a pressure-sensitive laminating agent such as acrylic on the upper surface of the removable substrate (1). ) formed on the upper surface of the radiation Ii
I indicates a cured resin film, and the thickness of the film (3) is 1 μm or more, considering a certain degree of strength during use.
Am or more is preferable.

The radiation-curable resin film (3) is formed by using, as a raw material, a radiation-curable epoxy resin, a urethane thread resin, an ester resin, or other lIf fat liquid that is cured by irradiation with radiation such as UV or II)B. It is obtained by coating the top surface of the adhesive layer (2) and irradiating this liquid film surface with radiation.
A smooth and uniformly thick to ultra-thin synthetic resin film (1J) can be easily formed around the adhesive layer in one piece without causing any wrinkles during tearing.This film (3
) preferably has a flexible metal and does not cause cracks or distortion even when rolled up after production. In addition, the anchorage on the surface of the adhesive layer (2) of the film (3) was extremely good, and when the adhesive sheet of the present invention produced as described above was used after being peeled off from the entire release paper (17) of the film (3). It is peeled off with the adhesive layer (2) applied to the entire back surface and can be used for pasting purposes such as decoration. A coloring agent is added to both or any one of the agent layers <2) for concealment or decoration in the same way as paint when applied to the surface to which it is applied, to form a colored film. , a colored adhesive layer. Further, if necessary, a mark (4) is suitably applied to the narrow side of the cured resin film <B).

If necessary, if the cured resin film (37) is extremely thin, apply an application sheet (5) on top of it to make it easier to peel off from the release paper (1) and to make it easier to stick. The adhesive layer (2) may be formed using a UV-curable adhesive instead of a pressure-sensitive adhesive.

Figures 2 and 3 show another manufacturing method. As shown in Figure 2, a radiation-curable fat liquid is applied to the upper surface of a releasable base material (υ), and then radiation 11M is applied to the surface of the liquid film. A constituent base material A that has been irradiated and made into a radiation-cured resin film (3), and separately,
As shown in Figure 3, the composition base material B, in which an adhesive coating liquid is applied and dried to form an adhesive layer (2) on the upper surface of the releasable base material (υ), is bonded to the adhesive layer surface and the cured resin film ( 3) The pressure-sensitive adhesive sheet of the present invention is manufactured by mutually polymerizing the two surfaces.

FIG. 4 shows still another manufacturing method of the present invention, in which a transparent releasable substrate (IJ) is coated with a radiation fi! curable resin liquid (3?) to form a liquid M (3'). After polymerizing the W-formed base material B shown in the second diagram above on the liquid film (3') surface of the adhesive layer (2) to the base material A', the transparent release paper (17) is coated with radiation from the outer surface. ?lJ as indicated by the arrow, the transparent releasable base material (1
)' to produce the pressure-sensitive adhesive sheet of the present invention by irradiating the liquid i (3) and curing it with radiation. In comparison, it was found that the anchoring effect of the radiation-cured resin film on the adhesive layer surface was significantly improved.

Next, a more detailed *h example will be explained.

Example 1 Apply acrylic adhesive coating liquid to the top surface of the peeled M paper.

After drying to form an adhesive layer, one side of the so-called non-carrier adhesive sheet was created by pasting all of the release paper on the top surface, and the #I paper on one side was completely removed, and the top surface of the exposed adhesive layer was coated with epoxy adhesive. #Curing type fat liquid (black product name ADX-1702
After being applied to Asahi Denka Kogyo Co., Ltd., the liquid film was irradiated with ultraviolet 11M FC 45 Q110Y+ high pressure mercury lamp for 2 seconds to form a cured resin film with a smooth surface of 5 μm thickness. An adhesive sheet (with a surface layer of aluminum) was manufactured using Jilt.

Example 2 A non-carrier adhesive sheet was prepared by applying a rubber adhesive blood on the top surface of a release paper and drying it to form an adhesive layer, and then removing one of the release papers of a non-carrier adhesive sheet created by laminating a release paper on the top surface of the adhesive layer. Urethane-based radiation curing is applied to the top surface of the exposed adhesive layer! S
! ! Resin liquid (product name EIX810b Dainichiseika Kagyo Co., Ltd.)
After coating #ri, the liquid film is exposed to ultraviolet @ f 45 w/
Irradiated it with an high pressure mercury lamp for 10 seconds and made it to a thickness of 50mm.
A pressure-sensitive adhesive sheet was obtained, which was covered with a cured resin film having a smooth surface of lim.

Example 3 UV curable adhesive (UV curable adhesive for screen printing manufactured by International Coating Co., Ltd. 0G-
39873) Coating solution' was cured to form an adhesive layer, and a release paper was attached to the top surface of the non-carrier adhesive sheet.Remove one of the release papers and remove the exposed adhesive layer. Ester-based radiation-curing resin liquid (product name K) is applied to the top surface.
After coating A-YARAD D and POA-120 (manufactured by Nippon Kayaku Co., Ltd.) to form a liquid film, the product was coated with Curetron ji1. B,'ft
The adhesive sheet was irradiated with 4 Mrad at 200 KV and 10 mA to obtain a pressure-sensitive adhesive sheet covered with a cured resin film having a smooth surface t and having a thickness of 2 μm.

Example 4 A base material in which an acrylic adhesive coating liquid was applied to the upper surface of a release paper and dried to form an adhesive layer (202~).

Apply a urethane radiation 1M curable resin liquid to the top surface of the peeled surface, and apply the above B and B to the liquid film at 200 KV and 10 mm.
A cured resin film (thickness 30μ) was irradiated with 4 Mrad at
A pressure-sensitive adhesive sheet was obtained by laminating the cured resin film surface of the other base material onto the upper surface of the pressure-sensitive adhesive layer of one of the base materials. The film surface was smooth and flat, and could be bonded without any tears or wrinkles. .

Example 4 An acrylic adhesive coating liquid was applied to the top surface of a release paper and dried to form an adhesive layer.A urethane radiation-curable resin liquid was applied to the top surface of a transparent release film and the liquid film was formed. Each of the formed base materials is created separately, and the adhesive layer of the base material for forming the adhesive layer is polymerized on the liquid film of the base material for forming the liquid film,
In this state, from below the aBA peeled 1m film, g, B
was applied to the liquid film to obtain a cured resin film.

A pressure-sensitive adhesive sheet was obtained in which the anchoring effect of the cured resin film on the surface of the pressure-sensitive adhesive layer was extremely excellent.

In this way, according to the present invention, since the radiation-cured phosphorus layer film is provided on the upper surface of the adhesive layer, it is possible to provide an adhesive sheet that is not only thin but also extremely thin and has a uniform thickness and is suitable for decorative purposes. During the manufacturing process, radiation is applied to the 1M curing resin liquid.
Because it is irradiated to form a cured resin film, unlike conventional powdered heavy industry resins that are thermally cured to form a cured resin film, there is no change in the quality of the adhesive due to heat or the production of a cured resin film with uneven thickness. It has the advantage of being able to eliminate the drawbacks such as these and provide a high-quality pressure-sensitive adhesive sheet.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an example of the pressure-sensitive adhesive sheet of the present invention, and FIGS. 2 and 3 are cross-sectional views showing the manufacturing process of an example of the method of manufacturing the pressure-sensitive adhesive sheet of the present invention. A cross-sectional view of one example of a manufacturing method step is shown. (l)...Peeling #lj~[1 (2)...Adhesive layer (3)...Radiation curing resin film (3')...Radiation curing iJ fat liquid A...Radiation curing resin Film A'...radiation curing! ! ! ! Coconut fat liquid B...Adhesive layer patent applicant: 2 people outside of Fuji Paper Co., Ltd. I 1m! Figure 2 350 Figure 4

Claims (1)

[Claims] 1. An adhesive sheet comprising a sequential laminate of a releasable base material, an adhesive layer, and a radiation-cured resin film. 2. A pressure-sensitive adhesive sheet characterized in that a radiation-curable resin liquid is applied to the surface of the pressure-sensitive adhesive layer formed on the surface of a releasable base material, and then the liquid film is irradiated with radiation to cure it to form a radiation-curable resin film. Manufacturing method. 3 After applying a radiation-curable resin liquid to the upper surface of a releasable base material, the liquid film is irradiated with radiation to form a radiation-curable resin film.A constituent base material is formed, and an adhesive coating liquid is applied to the surface of another releasable base material. and a constituent base material formed by coating and drying to form an adhesive layer, the radiation-cured resin film side and the adhesive layer side of the sheet are made to face each other, and the adhesive sheet is polymerized. Law. 4 After applying a radiation-curable resin liquid to the upper surface of a transparent releasable base material, the liquid film surface is faced to the adhesive layer surface formed by applying and drying an adhesive coating liquid to a separately prepared releasable base material surface. A method for producing a pressure-sensitive adhesive sheet, which comprises polymerizing and irradiating radiation from the outer surface of a transparent releasable base material in this state to cure the resin liquid to form a radiation-cured resin film.