JPH03231981A - Adhesive film manufacturing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing an adhesive film, and particularly to a method for producing an adhesive film for decoration.

[Prior Art] In recent years, decorative adhesive films have become widely used in place of painting. , it achieves the effect of displaying the desired decoration by simply pressing it onto the object to be decorated.Therefore, it is easier than painting, and is especially useful when displaying the same pattern, mark, etc. on a large number of objects to be decorated. Effective.However, since adhesive film is used, it is difficult to correct if the crimping position is incorrect, the film tends to wrinkle after crimping, and air remains between the adherend and the adhesive film. It has disadvantages such as being easy to use.

In order to improve these points, an adhesive film in which a non-adhesive substance was distributed on the adhesive surface of the adhesive film was developed
It is disclosed in Japanese Patent Application Laid-open No. 4-3120 and Japanese Patent Application Laid-Open No. 58N13682. When the adhesive film is simply in contact with the adherend, it produces almost no adhesive force, and only when strong pressure is applied, the adhesive film firmly adheres to the adherend, thereby improving adhesive workability. It is something that In the former method, a hollow, easily friable non-adhesive material is dispersed and held electrostatically on a thermoplastic coating layer on kraft paper, and the non-adhesive material is partially dispersed into the coating layer by heating at approximately 130°C and applying pressure. It is manufactured by pressing, then applying adhesive, and then pressing the film. The latter is produced by dispersing a solid, non-stick material on a release paper, applying an adhesive thereon, and pressing a vinyl chloride film onto it.

[Problem to be solved by the invention]

Since the adhesive force when the adhesive film contacts the object to be adhered depends on the degree of dispersion of the non-adhesive substance, the quality of its controllability directly affects the workability of film adhesion. However, in all of the prior art techniques described in B above, a non-adhesive substance is dispersed on a release paper, so it is difficult to control the dispersibility thereof.

Furthermore, in the conventional techniques, non-viscous substances are limited to hollow solids in the former case and non-hollow solids in the latter case, and those that are liquid at the time of dispersion cannot be used. Moreover, in the former case, the release paper is limited to a two-layer structure having a thermoplastic coating layer, and in addition,
This method had the disadvantage of requiring a high-temperature pressurization process at temperatures above ℃.

The present invention solves these conventional drawbacks and provides a method for producing an adhesive film that allows a wide variety of non-adhesive substances to be dispersed on an adhesive with good dispersion control, and that does not require high-temperature processing. purpose.

[Means to solve the problem]

The present invention includes a step of forming a large number of recesses on at least one surface of a release paper, a step of filling the multiplicity of recesses with a non-adhesive substance, and a step of forming a plurality of recesses on at least one surface of a release paper, and a step of filling the plurality of recesses with a non-adhesive substance. It is characterized by comprising the steps of applying an adhesive to the surface, and press-bonding a base material to the adhesive-coated surface of the release paper.

[For Use] In the present invention, a large number of four parts having a predetermined shape and distribution are formed in advance on the surface of a release paper, and after filling the recesses with a non-adhesive substance, an adhesive is applied. Therefore, the distribution of the non-adhesive substance on the adhesive can be controlled in advance. Furthermore, the substance to be filled in the recess may be liquid at the time of filling and can be solidified later (this allows the selection range of non-filling substances to be significantly expanded.

[Example 1 The present invention will be explained in detail below by way of examples.

FIG. 1 is a schematic cross-sectional view of an adhesive film for explaining the present invention.

In the present invention, recesses IA having a predetermined shape and a predetermined distribution are formed in the release paper 1 using an embossing roll or a press machine. As the release paper 1, any material commonly used for adhesive films can be used, such as release-treated glassine paper, clay coated paper, polyethylene laminate paper, etc. The shape and distribution of the recesses are appropriately selected depending on the adhesive strength of the adhesive used and the usage conditions of the adhesive film. Next, the recesses are filled with a non-stick material. Non-adhesive substances include silica, alumina, titane oxide, calcium carbonate, molybdenum disulfide, calcium hydroxide and other inorganic particles, sulfurized rubber, ebonite, styrene resin and other organic particles, glass beads, various microcapsules, etc. In addition to solid microparticles such as hollow microparticles, substances that are liquid at the time of filling, such as ultraviolet curable resins and thermosetting resins, and solidify by processing after filling can be used. When using the solid fine particles described above, the fine particles are dispersed in an appropriate dispersion medium such as water or alcohol to form a slurry, which is applied to the surface of the release paper 1 provided with the concave portions IA, and then the fine particles are applied with a squeezer or spatula. Wipe off the excess slurry by
Make it exist only in A. Then, if necessary, the release paper is heated to 40-50°C to evaporate the dispersion medium.

If the non-adhesive substance is an ultraviolet curable resin or a thermosetting resin, after applying uncured liquid resin to the surface of the release paper provided with the recesses, remove the excess resin and apply ultraviolet rays or heat to the recesses. The resin filled in is cured and solidified. Then, in this way, the fourth part IA is added to the non-stick material 2
An adhesive 3 is applied to the surface of the release paper 1 filled with the adhesive. The adhesive may be selected from among adhesives commonly used for adhesive films, such as acrylic adhesives and styrene-butadiene block copolymers, and applied according to a conventional method. Next, the surface base material 4 and the release paper coated with the adhesive 3 are pressed together in accordance with a conventional method. As the surface base material, polyvinyl chloride (PVC), acrylic acid ester copolymer, polyvinyl fluoride (PVF), polyurethane, etc. are used.

Next, specific examples of the present invention will be shown.

Polyethylene laminated paper was used as a release paper for the fire plate, and a piece of 150 μm thick was placed on one surface of the paper using an embossing roll.
Square pyramidal depressions with a depth of 30 μm at a density of 100 pieces/c
It was formed in m2. Then, an uncured ultraviolet curable resin UV-3700 (manufactured by Toagosei Co., Ltd.) was applied thereon, excess resin was removed using a squeezer, and the resin was cured by irradiation with ultraviolet rays.

Furthermore, an acrylic ester-based two-component curing type adhesive was applied thereon to a thickness of 327 zm, and a PvC film as a base material was pressure-bonded. Immediately before use, the adhesive film thus produced is brought into the state shown in FIG. 2 by peeling off the release paper 1, and the adhesive surface is brought into contact with the adherend. At this time, since UV curable resin, which is a non-adhesive substance, is dispersed on the surface of the adhesive 3, the adhesive film does not stick to the adherend, and therefore can be freely positioned on the adherend. can do.

After the adhesive film is placed in the correct position on the adherend,
If pressure is applied to the adhesive film, the film will firmly adhere to the adherend.

Table 1 shows the adhesion strength of the above-mentioned examples after being pressed onto an adherend and when simply brought into contact, in comparison with a decorative adhesive tape (comparative example) in which no non-adhesive substance is dispersed. In this case, the adherend is a painted iron plate, and the loop tack shown in the table involves contacting the adherend with a tape-shaped adhesive film in a loop shape with the adhesive layer on the outside, for example, over a length of several centimeters. This is the force used to tear it off after creating a state. The initial adhesive force is the force required to peel off the adhesive film from the adherend immediately after the adhesive film is pressed once with a 2 kg roll, and the permanent adhesive force is the force required to peel off the adhesive film from the adherend 24 hours after the adhesive film is pressed.

(The following is a blank space) As shown in Table 1, according to the present invention, when the adhesive film is in contact with the adherend, the adhesive force is Qg725 mm, and the adhesive film can freely move on the adherend. It can be moved and adheres to the adherend with strong adhesive force after being crimped. Therefore, according to the present invention, workability when pressure-bonding an adhesive film to an adherend can be significantly improved.

Cone-shaped recesses with a diameter of 200 μm and a depth of 50 μm were formed on the surface of the release paper at a density of 25 pieces/cm.Then, an adhesive film was prepared in exactly the same manner as in Example 1. The adhesive properties and loop tack of the film were similar to Example 1.

Product 11 A saturated polyester resin was applied to the concave portions of a release paper formed in the same manner as in Example 1, excess resin was removed using a squeezer, and the material was dried at 50° C. for 1 minute to obtain a non-adhesive material. Thereafter, an adhesive film was produced in the same manner as in Example 1. The adhesive properties and loop tack of this adhesive film were the same as in Example 1. Note that even when the concave portion was formed into a conical shape similar to that in Example 2, there was no change in the characteristics.

Even when clay coat paper was used instead of polylaminate paper as the release paper in each of the above Examples, the adhesive properties and loop tack were the same.

In addition, in the explanation so far, an example was shown in which a concave part was processed only on one surface of the paper and filled with a non-adhesive substance.
It is clear that both sides of the release paper can be treated to form a non-adhesive agent dispersed on the adhesive surface on both sides of the release paper.

As mentioned above, the shape and distribution of the recesses formed on the surface of the release paper vary depending on the properties of the adhesive and the purpose of use. Under typical conditions of use, the depth of the recess,
In other words, the height of the non-adhesive material from the surface of the adhesive layer is 3μ.
The range is preferably from m to 50 μm; if the recess is shallower than this, the adhesive force upon contact will be too large, and if the recess is deeper than this, the aesthetic appearance of the film surface after the pressure-sensitive adhesive film is bonded will be spoiled. The distribution of recesses is also related to the depth of the recesses, but generally it is 10 pieces/c.
m" to 200 pieces/cm2 is desirable. If the distribution is sparser than this, the adhesive force during contact will be too strong, and if the distribution is denser than this, the adhesive force during pressure bonding will be weak (but in either case, the adhesive force during crimping will be too strong. It will damage your sexuality.

〔Effect of the invention〕

As explained above, according to the present invention, since recesses are formed in advance in the release paper and filled with a non-adhesive substance, the distribution of the non-adhesive substance can be controlled, and therefore the adhesive film can be adhered to. The adhesion force upon contact with and after pressure bonding can be sufficiently controlled. Furthermore, according to the present invention, not only solid fine particles but also a liquid substance that solidifies through subsequent processing can be used as the non-adhesive substance.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of an adhesive film for explaining the method of the present invention, and FIG. 2 is a schematic cross-sectional view showing a state in which a release paper has been peeled off from the adhesive film according to the present invention. DESCRIPTION OF SYMBOLS 1... Release paper, IA... Recessed part, 2... Non-adhesive substance, 3... Adhesive material, 4... Surface base material.

Claims (1)

[Claims] 1) Forming a large number of recesses on at least one surface of the release paper, filling the large number of recesses with a non-adhesive substance, and forming a plurality of recesses on the surface of the release paper on the side filled with the non-adhesive substance. A method for producing an adhesive film, comprising the steps of applying an adhesive and press-bonding a base material to the adhesive-coated surface of the release paper.