JP2001139896A - Method of producing pressure-sensitive adhesive sheet, and dust removal apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of producing a pressure-sensitive adhesive sheet having a partially formed pressure-sensitive adhesive layer. SOLUTION: On the surface of a substrate film 11, a friction-treated plane 18 is formed, and heated rods 13 are pushed against the treated plane 18 to partially heat it. Then, a pressure-sensitive adhesive layer 14 is formed on all the treated plane 18. When a release sheet 30 is stuck to the adhesive layer 14 and then peeled therefrom, the adhesive layer 14 on the heated parts 18b of the treated plane 18 is peeled from the substrate film 11 and transferred to the release sheet 30 and the adhesive layer 14 on the other parts 18a is not peeled from the substrate 11, thus giving a pressure-sensitive adhesive sheet 20 having the adhesive layer 14 partially formed on the substrate 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the technical field of pressure-sensitive adhesive sheets, and more particularly to a method for producing a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed partially.

[0002]

2. Description of the Related Art Conventionally, a base film and an adhesive sheet having an adhesive layer formed on its surface have been widely used.
When this pressure-sensitive adhesive sheet is used in a dust removing device, it is known that dust is more likely to adhere to the pressure-sensitive adhesive layer if the pressure-sensitive adhesive layer has irregularities on the surface thereof than the flat surface, and the dust-removing effect is high.

With reference to FIGS. 6 (a) to 6 (c), a conventional method for producing a pressure-sensitive adhesive sheet will be described.
Reference numeral 11 denotes a long-reverse base film (FIG. 4).
(A)). An adhesive is applied on the base film 111 to form an adhesive layer 114, and the comb-like knife blade 1
30 is pressed perpendicularly to the lengthwise direction of the base film 111, and is fixed in such a manner that the leading end 132 is buried in the adhesive layer 114 (FIG. 2B). Next, when the adhesive layer 114 is sent in the longitudinal direction together with the base film 111, the adhesive layer 114 is scraped off at the portion in contact with the tip 132 of the comb-shaped knife blade 130, and a groove-shaped recess 118 b is formed in the longitudinal direction. You. Then, when dried, an adhesive sheet 120 in which the convex portions 118a and the concave portions 118b are formed on the adhesive layer 114 is obtained (FIG. 3C).

As described above, in the prior art, the amount of the adhesive applied is controlled using a knife blade. Since this method is simple, it is used for producing an adhesive sheet.

However, since the pressure-sensitive adhesive layer 114 has fluidity before drying, the pressure-sensitive adhesive flows from the convex portion 118a to the concave portion 118b, and the height difference between them becomes small. In particular, the adhesive layer 11 is
4 is shallowly shaved, the convex portion 118a and the concave portion 11
8b is almost completely eliminated. In order to increase the height difference, if the adhesive layer 114 is to be deeply scraped off with the comb-shaped knife blade 130, the base film 111 may be damaged by the tip 132 of the comb-shaped knife blade 130, or may be torn in extreme cases. is there.

Therefore, in the prior art, it was difficult to form unevenness having a sufficient height difference on the adhesive layer of the adhesive sheet.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned disadvantages of the prior art, and has as its object to manufacture a pressure-sensitive adhesive sheet in which a pressure-sensitive adhesive layer is partially formed.

[0008]

Means for Solving the Problems In order to solve the above problems, the invention according to claim 1 is a method for producing a pressure-sensitive adhesive sheet, wherein the surface of a base film is rubbed by friction means to form a friction-treated surface. Partially heating the base film, forming an adhesive layer on the surface of the base film rubbed by the friction means, applying a peeling means to the surface of the adhesive layer, and then peeling the peeling means. I do. The invention according to claim 2 is the method for producing a pressure-sensitive adhesive sheet according to claim 1, wherein the partial heating is performed by bringing a heating unit having increased temperature into contact with the base film, and It is characterized in that it is performed while relatively moving. The invention according to claim 3 is the method for producing a pressure-sensitive adhesive sheet according to claim 2, wherein the temperature of the heating means is 60 ° C. or higher and 10 ° C.
It is characterized in that the temperature is not more than 0 ° C. The invention according to claim 4 is the method for producing a pressure-sensitive adhesive sheet according to any one of claims 1 to 3, wherein a polylactic acid film is disposed on at least the surface to be rubbed of the base film. Features. The invention according to claim 5 is the method for producing a pressure-sensitive adhesive sheet according to any one of claims 1 to 4, wherein an aliphatic polyester film is disposed on at least the rubbed surface of the base film. It is characterized by putting. The invention according to claim 6 is the method for producing a pressure-sensitive adhesive sheet according to any one of claims 1 to 5, wherein the rubbed surface of the base film has a pressure-sensitive adhesive layer containing polyisoprene rubber as a main component. Is formed. According to a seventh aspect of the present invention, there is provided a dust remover, wherein the pressure-sensitive adhesive sheet produced by the method according to any one of the first to sixth aspects and a base film of the pressure-sensitive adhesive sheet are disposed on the surface thereof. It is characterized by. The invention according to claim 8 is the dust removing device according to claim 7, wherein the base has a hollow cylindrical shape, and the adhesive sheet is wound around the outer periphery of the base with the adhesive layer facing outward. It is characterized by the following.

The present invention is configured as described above. First, the surface of the base film is subjected to a friction treatment by a friction means. For example, when a polylactic acid film is subjected to a friction treatment and then an adhesive layer made of natural rubber is formed on the surface, the polylactic acid film and the adhesive layer are applied with a force of 1000 g / 2 cm (a measurement object is a 2 cm-wide film specimen). Does not peel off. On the other hand, when the polylactic acid film is not subjected to a friction treatment and an adhesive layer is formed, the polylactic acid film and the adhesive layer have a weight of 30 g / 2.
Peel off with a force of cm. Therefore, on the friction-treated surface of the base film, the adhesive strength with the adhesive layer is improved.

However, the inventors of the present invention have found that the effect of improving the adhesive strength disappears when the adhesive layer is formed after heating the base film whose surface has been subjected to friction treatment. For example, on the friction-treated surface of a polylactic acid film,
After pressing the heated soldering iron-like rod, when an adhesive layer made of natural rubber was formed on the surface thereof, the polylactic acid film and the adhesive layer were peeled off with a force of 30 g / 2 cm.

Therefore, a friction-treated surface is formed by rubbing a large area of the surface of the base film, and after partially heating the friction-treated surface, an adhesive layer is formed on the entire friction-treated surface. In the heated portion, the adhesive strength between the adhesive layer and the base film is weakened, and it becomes easy to remove the adhesive layer in that portion.

For example, when the sheet-like peeling means is adhered to the above-mentioned adhesive layer and then peeled off, the adhesive layer is partially removed by utilizing the difference in adhesive force between the adhesive layer and the base film. Can be peeled. In this case, the adhesive force between the peeling means and the adhesive layer is smaller than the adhesive force between the friction-treated substrate film and the adhesive layer, and the heated portion of the friction-treated surface of the substrate film and the adhesive layer. If the adhesive strength is larger than the adhesive strength between the two, it is possible to cleanly peel off only the adhesive layer in the heat-treated portion of the friction-treated surface.

The peeling means that can be used in the present invention includes:
For example, a sheet-like material such as a release sheet or a roll-like material may be used. Further, the peeling means may have a single-layer structure or a laminated structure of a plurality of layers, and an adhesive layer may be formed on a surface to be adhered to the adhesive layer.

The heating means used for partial heating of the base film may be a roll, a gear, or a soldering iron. When the base film is run with these heating means in contact with the base film, heat treatment can be performed continuously.

Although the friction-treated surface of the substrate film does not lose its friction-treating effect even when heated to a temperature of less than 60 ° C.,
It disappears when heated above ℃. On the other hand, when a polylactic acid film is used for the friction-treated surface of the base film, it shrinks when heated above 100 ° C. Accordingly, in the present invention, when the heating means is used for partial heating by raising the temperature in a temperature range of 60 ° C. or more and 100 ° C. or less, the friction treatment effect can be eliminated without damaging the base film.

A biodegradable resin film such as a polylactic acid film or an aliphatic polyester film is used for the base film of the present invention, and a polyisoprene such as natural rubber or synthetic polyisoprene is similarly used for the adhesive layer. The use of a biodegradable pressure-sensitive adhesive as a component facilitates disposal of the pressure-sensitive adhesive sheet.

Therefore, when the pressure-sensitive adhesive sheet produced by the production method of the present invention is used, a dust-removing device having a high dust-removing effect and ready for disposal can be produced.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for producing a pressure-sensitive adhesive sheet according to the present invention will be described with reference to the drawings. With reference to FIG. 1, a pay-out roll 3 on which a long polyhedral polylactic acid film (a film obtained by biaxially stretching Lacty (trade name, manufactured by Shimadzu Corporation)) is wound.
And a friction means 7 provided with a flexible friction cloth such as a cotton cloth on the surface of the roll body, pull out the polylactic acid film 9 from the feeding roll 3, wrap it around the friction means 7, and Take up. At this time, when the friction means 7 is rotated in a direction opposite to the traveling direction of the polylactic acid film 9 so that the surface of the polylactic acid film 9 is rubbed in a dry atmosphere (normal temperature, normal pressure, in the atmosphere), the friction is increased. Means 7
Is larger than the tape width of the polylactic acid film 9, so that the entire surface of the polylactic acid film 9 is subjected to friction treatment.

In FIG. 2A, reference numeral 11 denotes a substrate film which has been subjected to friction processing in the above process, and reference numeral 18 denotes a friction-treated surface of the substrate film 11 which is rubbed by friction means.

Next, a plurality of bars 13 made of a metal in the form of a soldering iron are arranged at intervals of 1 cm, heated to 80 ° C., and then pressed against the friction-treated surface 18 of the base film 11.
In the portion 18b heated by being pressed against the rod 13, the effect of improving the adhesive force by the friction treatment disappears, and the other portion 18a
Thus, the effect of improving the adhesive force by the friction treatment is maintained.

The substrate film 11 as described above is moved in a general adhesive layer forming apparatus, and an adhesive layer raw material solution in which a natural rubber-based adhesive containing polyisoprene as a main component is dissolved in an organic solvent is used. 11 is applied and dried on the entire surface of the friction-treated surface 18 to form an adhesive layer 14 having a thickness of 10 μm (FIG. 3C).

Next, a sheet-like peeling means 30 is prepared. The entire surface of the base film 31 made of a polylactic acid film of the peeling means 30 is subjected to friction treatment in the same step as the above-mentioned friction treatment step, and an adhesive layer 34 made of natural rubber is formed on the entire surface subjected to the friction treatment. . The adhesive layer 34 of the peeling means 30 and the adhesive layer 14 face each other,
Next, after these are adhered, the peeling means 30 is peeled off (FIG. 4D), and the adhesive force between the base film 11 and the adhesive layer 14 is reduced at the heated portion 18b of the friction-treated surface 18 by the adhesive layers. Since the adhesive strength of the adhesive layer 14 is smaller than the adhesive strength of the base film 11,
Transferred to 0. In the other portion 18a, the adhesive strength between the base film 11 and the adhesive layer 14 is smaller than that of the adhesive layers 14,
4 is greater than the adhesive strength of the adhesive layer, so that the peeling means is
The adhesive layer 14 is peeled off at the interface between the base film 4 and the base film 1.
1 (FIG. 2D).

FIG. 2E shows a pressure-sensitive adhesive sheet 20 formed in the above steps. Since the pressure-sensitive adhesive layer 14 of the pressure-sensitive adhesive sheet 20 is partially formed on the base film 11, the height difference h of the unevenness of the pressure-sensitive adhesive layer 14 is equal to the thickness of the pressure-sensitive adhesive layer (in this case, about 10 μm). Accordingly, it is possible to manufacture the pressure-sensitive adhesive sheet 20 having the pressure-sensitive adhesive layer 34 having a concave-convex shape having a large difference in height as compared with the pressure-sensitive adhesive sheet 120 of the related art.

In the above embodiment, the surface of the polylactic acid film was subjected to a friction treatment and used as the base film 11. However, the present invention is not limited to this. The film has biodegradability and has a friction-treated surface. Can be widely used.
Examples of biodegradable films other than polylactic acid film,
An adhesive tape using a bionore film will be described.

Bionore is a high molecular weight aliphatic polyester obtained by a polycondensation reaction of a glycol such as 1,4-butanediol with an aliphatic dicarboxylic acid such as succinic acid or adipic acid. Have.

The molecular structure is represented by the following chemical formula.

[0027]

Embedded image

The bionole film is represented by the above formulas m and n.
Are classified into two types, polybutylene succinate (PBS) and polybutylene succinate adipate (PBSA).

The physical properties of the bionore films (PBS and PBSA) are shown in the following table in comparison with general-purpose resins.

[0030]

[Table 1]

As can be seen from Table 1, the bionole has a large tensile elongation and is tenacious and soft. Therefore,
It is suitable for applications such as films, sheets, and nonwoven fabrics that require flexibility.

As the base film 11, not only a bionole film or a polylactic acid film may be used as a single layer, but also two or more biodegradable films as described above may be laminated.

Since the effect of improving the adhesive force between the base film 11 and the adhesive layer 14 by the friction treatment can be obtained even with a resin film such as a polyester film or a polyimide film, such a synthetic resin film having no biodegradability is used. Although it can be used as a base film, it is preferable to use a biodegradable resin film from the viewpoint of environmental protection.

In order to partially eliminate the frictional treatment effect, in the above embodiment, the heated rod 13 was
However, the rod 13 may be pressed against the surface on the opposite side of the friction processing surface 18.

The pressure-sensitive adhesive that can be used to form the pressure-sensitive adhesive layer 14 includes natural rubber mainly composed of polyisoprene, synthetic isoprene rubber, nitrile rubber, and SBR rubber, as in the above embodiment. Various rubber-based pressure-sensitive adhesives can be used. However, from the viewpoint of biodegradability, it is desirable to use natural rubber or synthetic isoprene rubber as in the case of the base film 11.
When adding a filler or coloring agent for opacity,
A material that does not inhibit the biodegradability of the adhesive layer 14 may be used.

In the above embodiment, the pressure-sensitive adhesive layer 14 is formed directly on the friction-treated surface 18 of the base film 11, but a primer layer may be formed first, and the pressure-sensitive adhesive layer may be laminated thereon. Also in this case, it is preferable to use a biodegradable material for the primer layer.

As described above, the pressure-sensitive adhesive sheet 20 according to the present invention
Is composed entirely of biodegradable substances,
The problem of disposal and the problem of dioxin during incineration are eliminated.

Next, an example of a dust remover using the pressure-sensitive adhesive sheet 20 prepared in the above embodiment will be described. FIG.
Denotes a roller-type dust removing device (adhesive roller). The dust removing device 50 has a support shaft 52, an arm 53, a base 51, and an adhesive sheet 20. The support shaft 52 is made of a cylindrical metal, and the arm 53 is made of a rod-shaped metal. One end of the arm 53 has a grip 54
Are mounted, and the other end is rotatably mounted on the bottom surface of the support shaft 52.

The base 51 is made of a hollow cylindrical cardboard paper, into which a support shaft 52 is inserted from the bottom surface opposite to the bottom surface to which the arm 53 is attached.
Since the outer periphery of the support shaft 52 and the inner periphery of the base 51 are formed substantially equal, when the support shaft 52 is inserted into the base 51, the outer surface of the support shaft 52 has Are adhered to each other so that the support shaft 52 does not easily fall out of the base 51. A plurality of adhesive sheets 20 are wound around the outer periphery of the base 51 with the adhesive layer 14 facing outward. When attaching the adhesive sheet 20 to the base 51,
The groove shape of the adhesive layer 14 may be either perpendicular or horizontal to the central axis of the base 51.

The dust removing device 50 of the present invention is configured as described above. When the dust removing device 50 is used to clean dust on the floor, the adhesive layer 14 of the adhesive sheet 20 is held with the holding portion 54 held. When the adhesive sheet 20 is brought into close contact with the floor surface and moved in a direction perpendicular to the central axis of the support shaft 52 and the base 51, the adhesive sheet 20
1 and the shaft 52, and dust on the floor adheres to the adhesive layer 14 on the surface of the adhesive sheet 20.

The dust removing device 50 of the present invention has the adhesive sheet 2
The part that has lost the zero tackiness can be cut off and discarded. Since the base film 11 and the adhesive layer 14 of the adhesive sheet 20 are made of a biodegradable substance,
Its disposal is easy. When the base 51 is made of a biodegradable material such as cardboard, when the new adhesive sheet 20 is mounted together with the base 51, the old base 51 can be easily discarded.

The dust removing device using the pressure-sensitive adhesive sheet 20 of the present invention is not limited to a roller-type device. For example, a dust removing device (a dust mat) in which the base film 11 of the pressure-sensitive adhesive sheet 20 is disposed on a mat-shaped base. ) Can also be created.

In the above embodiment, the base film 11
However, the present invention is not limited to this. For example, if the width of the friction means 7 is reduced, only the central portion of the base film 11 can be subjected to friction processing, and It is also possible to friction-treat only the part.

In the above embodiment, the case where the rod 13 is used as the heating means has been described. However, the present invention is not limited to this. As shown in FIG. 4, reference numeral 60 and FIG. Any suitable heating means may be used.

The heating means 60 shown in FIG. 4 has a support shaft 62 and a plurality of disks 64 (17 are shown in the drawing). The disks 64 are arranged at intervals, and the support shaft 62 is inserted into the center of the disks 64. Each of the disks 64 is attached so as to be rotatable around the support shaft 62 as a central axis. The support shaft 62 is connected to a heating device (not shown).

A description will be given of the step of heating the base film 71 subjected to friction processing in the same step as that of FIG. 1 of the above embodiment using the heating means 60. First, the heating means 60 is heated to a predetermined temperature, 71 is pressed against the frictional processing surface 78. In this state, the base film 71 is heated by the heating means 60.
Of the disk 64 in the direction perpendicular to the support shaft 62 of the
Is rotated without separating from the base film 78, the portion of the friction processing surface 78 that is in contact with each disk 64 is continuously heated, and as a result, the friction processing surface 78 of the base film 78 The number of the portions 78b heated in parallel with the longitudinal direction is the same as the number of the disks 64.

On the other hand, the heating means 80 shown in FIG. 5 has a gear 84 made of metal and a support shaft 82, and the support shaft 82 is inserted into the center of the gear 84. On the surface of the gear 84, teeth 86 are provided. The gear 84 is mounted so as to be rotatable around a support shaft 82 as a central axis.

The step of heating the base film 91 subjected to the friction treatment in the same step as in FIG. 1 of the above embodiment using the heating means 80 will be described. First, the heating means 80 is formed by using a heating means (not shown). To a predetermined temperature, and is pressed against the friction-treated surface 98 of the base film 91. In this state, when the base film 91 is run in the direction perpendicular to the central axis of the heating means 80 and the gear 84 is rotated at a constant speed without separating the base film 91 from the base film 91, the gear 84 contacts the teeth 86 of the gear 84 on the friction processing surface 98. The heated part is continuously heated.
As a result, the same number of heated portions 98 b as the teeth 86 are formed on the frictionally treated surface 98 of the base film 91.

Therefore, the heating means 60, 80 as described above
An adhesive layer is formed on the friction-treated surfaces 78 and 98 of the base films 71 and 91 that have been subjected to the heat treatment, and as shown in FIG. 2D, the adhesive layer is partially peeled off using a release sheet. A groove-shaped adhesive layer parallel to the longitudinal direction of the pressure-sensitive adhesive sheet is formed on the base film 71 heated by the heating means 60 in FIG. 4, and the adhesive sheet is formed on the base film 91 heated by the heating means 80 in FIG. The adhesive layer is formed in a groove shape perpendicular to the longitudinal direction. Since any heating means can continuously heat-treat the base film, it can be used for mass production.

[0050]

According to the present invention, a pressure-sensitive adhesive sheet in which a pressure-sensitive adhesive layer is partially formed on a base film can be produced. Further, since this pressure-sensitive adhesive sheet is composed of a substance having biodegradability, using this pressure-sensitive adhesive sheet makes it possible to obtain a dust-removing device that has a high dust-removing effect and is easy to dispose.

[Brief description of the drawings]

FIG. 1 is a view for explaining a method for producing an adhesive tape of the present invention.

FIGS. 2A to 2E are diagrams for explaining the method for producing an adhesive tape of the present invention.

FIG. 3 is a perspective view of an adhesive roller which is an example of the dust removing device of the present invention.

FIG. 4 is a view for explaining a heating means used in the present invention.

FIG. 5 is a view for explaining a heating means different from the above-mentioned heating means.

FIGS. 6A to 6C are diagrams for explaining a conventional method for producing an adhesive tape.

[Explanation of symbols]

 11: Base film 13: Rod 14, 34: Adhesive layer 18: Friction treated surface 18a: Heated portion 18b: Other portion 20: Adhesive sheet 30: Peeling means 50: Dust removal device 51 ... Base

Claims (8)

[Claims] 1. A surface of a substrate film is rubbed by a friction means to form a friction-treated surface, and then the substrate film is partially heated to form an adhesive layer on the friction-treated surface, and a peeling means is provided on the surface of the adhesive layer. And then peeling off the peeling means. 2. The method according to claim 1, wherein the partial heating is performed by bringing a heating unit having a raised temperature into contact with the base film and relatively moving the base film and the heating unit. The method for producing a pressure-sensitive adhesive sheet according to the above. 3. The temperature of said heating means is 60 ° C. or higher and 100 ° C.
The method for producing a pressure-sensitive adhesive sheet according to claim 2, wherein: 4. The pressure-sensitive adhesive sheet according to claim 1, wherein a polylactic acid film is disposed on at least a surface of the base film on which the friction-treated surface is formed. Production method. 5. An aliphatic polyester film is disposed on at least a surface of the base film on which the friction-treated surface is to be formed.
The method for producing a pressure-sensitive adhesive sheet according to any one of the preceding claims. 6. The friction-treated surface of the base film,
The method for producing a pressure-sensitive adhesive sheet according to any one of claims 1 to 5, wherein a pressure-sensitive adhesive layer containing polyisoprene rubber as a main component is formed. 7. A dust remover comprising: a pressure-sensitive adhesive sheet produced by the method for producing a pressure-sensitive adhesive sheet according to claim 1; and a base on which a base film of the pressure-sensitive adhesive sheet is disposed. . 8. The dust removing apparatus according to claim 7, wherein the base is cylindrical, and the adhesive sheet is wound around the base with the adhesive layer facing outward.