KR20190086429A - METHOD FOR MANUFACTURING BOTTLE SILICON ADHESIVE SHEET - Google Patents

Abstract

A step of forming a first pressure sensitive adhesive layer (21) by applying a first coating liquid containing a silicone pressure sensitive adhesive on a first base surface (11a) of a base material (11) A step of laminating a film (31) to obtain a one-sided silicone adhesive sheet having antistatic properties, a step of winding a one-sided silicone adhesive sheet in a roll form, a step of feeding out a roll- A step of forming a second pressure-sensitive adhesive layer (22) by applying a second coating liquid containing a silicone-based pressure-sensitive adhesive on a second base surface (11b) opposite to the first base surface (11a) Wherein the second release film (32) is laminated on the pressure-sensitive adhesive layer (22) and rolled up into a roll form.

Description

METHOD FOR MANUFACTURING BOTTLE SILICON ADHESIVE SHEET

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a double-sided silicone adhesive sheet and a method for producing the double-sided silicone adhesive sheet.

BACKGROUND ART Heat-resistant pressure-sensitive adhesive sheets using a silicone-based pressure-sensitive adhesive are widely used in the manufacturing process of electronic devices.

For example, in Patent Document 1, a pressure-sensitive adhesive tape for electronic devices is produced by applying an addition reaction-type silicon pressure-sensitive adhesive together with a platinum catalyst to one side of a polyimide film as a heat-resistant substrate.

In Patent Document 2, a pressure sensitive adhesive prepared by adding a two-part curable silicone rubber containing a vinyl group and a hydrosilyl group in a dimethylsiloxane main chain to a silicone pressure sensitive adhesive is applied to a polyimide base layer and dried to obtain a heat resistant And an adhesive tape is produced.

In Patent Document 3, a silicone-based adhesive layer is formed by applying a toluene solution containing an addition reaction type silicone adhesive, a platinum-based catalyst, and dimethyl silicone oil onto one surface of a polyimide film as a base material and heating it. Further, a polyethylene terephthalate film is stuck to the silicone adhesive layer to produce a surface protecting adhesive tape.

In the pressure-sensitive adhesive tapes of Patent Documents 1 to 3, a solvent-based coating solution obtained by diluting a silicone pressure-sensitive adhesive with a solvent is applied to a polyimide film as a heat-resistant substrate and dried to form the silicone- have.

Japanese Patent Application Laid-Open No. 2004-224857 Japanese Laid-Open Patent Publication No. 2012-151360 Japanese Laid-Open Patent Publication No. 2013-147540

In recent years, not only single-sided silicone adhesive sheets but also double-sided silicone adhesive sheets have been required.

The double-sided silicone pressure-sensitive adhesive sheet can be produced by a method in which the pressure-sensitive adhesive composition is directly applied to a substrate using a roll coater or a die coater, and then a release sheet is adhered to the pressure-sensitive adhesive layer obtained through a drying process (hereinafter referred to as a direct coating method) (Hereinafter referred to as transfer method) in which a pressure-sensitive adhesive composition is once coated on a release sheet, and a pressure-sensitive adhesive layer obtained through a drying process is transferred onto a substrate. The double-sided silicone pressure-sensitive adhesive sheet produced by the transfer method tends to have poor adhesion to the pressure-sensitive adhesive layer and the substrate as compared with the double-sided silicone pressure-sensitive adhesive sheet produced by the direct coating method. Therefore, the double-sided silicone adhesive sheet is preferably obtained by using a direct coating method. Specifically, a coating solution of a silicone pressure-sensitive adhesive is applied to one surface (first surface) of a substrate to form a first pressure-sensitive adhesive layer, thereby obtaining a one-sided silicone pressure-sensitive adhesive sheet. Thereafter, for example, a single-sided silicone adhesive sheet wound in a roll form is fed out and a coating solution of a silicone-based pressure-sensitive adhesive is applied to the other surface (second base surface) of the base material to form a second pressure- .

However, when the double-sided silicone adhesive sheet was produced by the above-described method, it was confirmed that the charging amount of the single-sided silicone adhesive sheet was increased in the preparation of the single-sided silicone adhesive sheet. In the step of forming the second pressure-sensitive adhesive layer by applying the coating solution of the silicone-based pressure-sensitive adhesive on the second base material side, the static pressure of the one-side silicone pressure- May be ignited, which may cause a fire.

An object of the present invention is to provide a process for producing a double-sided silicone pressure-sensitive adhesive sheet by a direct coating method, in which the organic solvent of the silicone pressure-sensitive adhesive coating solution is likely to be ignited by the static electricity of the one- There is no need to provide a method for producing a double-sided pressure-sensitive adhesive sheet which can be safely produced. Another object of the present invention is to provide a highly reliable double-sided pressure-sensitive adhesive sheet in which the increase in the amount of charge is suppressed.

According to one aspect of the present invention, there is provided a process for producing a pressure sensitive adhesive sheet, comprising the steps of: applying a first coating liquid containing a silicone-based pressure sensitive adhesive on a first base material side of a substrate to form a first pressure sensitive adhesive layer; Side silicone pressure-sensitive adhesive sheet having antistatic properties; winding the single-sided silicone pressure-sensitive adhesive sheet in a roll; feeding the roll-wound single-sided silicone pressure-sensitive adhesive sheet; A step of forming a second pressure sensitive adhesive layer by applying a second coating liquid containing a silicone based pressure sensitive adhesive on a second substrate side opposite to the substrate surface, a step of laminating a second release film on the second pressure sensitive adhesive layer, There is provided a process for producing a double-sided silicone pressure-sensitive adhesive sheet having a step of winding.

In the method for producing a double-sided pressure-sensitive adhesive sheet according to an embodiment of the present invention, it is preferable that the first coating liquid contains an antistatic agent.

In the method for producing a double-sided silicone adhesive sheet according to an embodiment of the present invention, it is preferable that the antistatic agent contained in the first coating liquid is an ion-conductive silicone-based compound.

In the method for producing a double-sided silicone adhesive sheet according to an embodiment of the present invention, it is preferable that the antistatic agent contained in the first coating liquid is a silicone oil containing an ionic group-containing silicone oligomer or an alkali metal salt dissolved therein.

In the method for producing a double-sided pressure-sensitive adhesive sheet according to an embodiment of the present invention, it is preferable that the second coating liquid contains an antistatic agent.

In the method for producing a double-sided pressure-sensitive adhesive sheet according to an embodiment of the present invention, it is preferable that the substrate is a long film (strip).

In the method for producing a double-sided pressure-sensitive adhesive sheet according to an embodiment of the present invention, the substrate is preferably a polyimide film.

In the method for producing a double-faced silicone adhesive sheet according to an embodiment of the present invention, a plurality of test pieces of A4 size are prepared from the single-sided silicone adhesive sheet on a roll and a plurality of the test pieces are stacked to produce a laminate, It is preferable that a charging amount of one piece of the test piece after 60 seconds elapse after taking out one piece of the test piece from the outermost layer of the sieve and taking out one piece of the test piece from the laminate is 10 kV or less.

According to an aspect of the present invention, there is provided a pressure-sensitive adhesive sheet comprising a substrate having a first substrate side and a second substrate side opposite to the first substrate side, a first pressure-sensitive adhesive layer formed on the first substrate side, And a second release film laminated on the second pressure sensitive adhesive layer, wherein the first pressure sensitive adhesive layer and the second pressure sensitive adhesive layer are laminated on the first pressure sensitive adhesive layer, Wherein the first pressure sensitive adhesive layer contains a silicone based pressure sensitive adhesive and the first pressure sensitive adhesive layer has antistatic properties.

In the double-sided silicone pressure-sensitive adhesive sheet according to one aspect of the present invention, it is preferable that the base material is a long film (strip).

In the double-sided silicone pressure-sensitive adhesive sheet according to one embodiment of the present invention, the substrate is preferably a polyimide film.

In the double-sided silicone pressure-sensitive adhesive sheet according to an embodiment of the present invention, the first pressure-sensitive adhesive layer preferably contains an antistatic agent.

In the double-sided silicone pressure-sensitive adhesive sheet according to an embodiment of the present invention, the antistatic agent contained in the first pressure-sensitive adhesive layer is preferably an ion-conductive silicone-based compound.

In the double-sided silicone pressure-sensitive adhesive sheet according to an embodiment of the present invention, it is preferable that the antistatic agent contained in the first pressure-sensitive adhesive layer is a silicone oil containing an ionic group-containing silicone oligomer or an alkali metal salt dissolved therein.

In the double-sided silicone pressure-sensitive adhesive sheet according to an embodiment of the present invention, it is preferable that the second pressure-sensitive adhesive layer contains an antistatic agent.

According to the present invention, in the step of producing a double-faced silicone adhesive sheet by a direct coating method, the organic solvent of the silicone-based adhesive coagulant solution is likely to be ignited by the static electricity of the one- There can be provided a method for producing a double-sided pressure-sensitive adhesive sheet which can be safely produced. Further, according to the present invention, it is possible to provide a double-sided pressure-sensitive adhesive sheet with high safety, in which an increase in charge amount is suppressed.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic cross-sectional view of a double-sided silicone adhesive sheet according to an embodiment. FIG.
Fig. 2 is a view for explaining a part of an apparatus for producing a double-sided silicone adhesive sheet according to the embodiment. Fig.
Fig. 3A is a view for explaining a part of a manufacturing process of a double-sided silicone adhesive sheet according to the embodiment. Fig.
Fig. 3B is a view for explaining a part of the manufacturing process of the double-sided silicone adhesive sheet according to the embodiment. Fig.
3C is a view for explaining a part of a manufacturing process of a double-sided silicone adhesive sheet according to the embodiment.
Fig. 3D is a view for explaining a part of the manufacturing process of the double-sided silicone adhesive sheet according to the embodiment.
Fig. 3E is a view for explaining a part of the manufacturing process of the double-sided silicone adhesive sheet according to the embodiment. Fig.
4 is a schematic cross-sectional view of a double-sided silicone adhesive sheet according to a modification of the embodiment.

[Double-faced silicone adhesive sheet]

1 is a schematic cross-sectional view of a double-sided silicone adhesive sheet 1 of the present embodiment.

The double-sided silicone adhesive sheet 1 comprises a base material 11 having a first base surface 11a and a second base surface 11b opposite to the first base surface 11a, A first peeling film 31 laminated on the first pressure sensitive adhesive layer 21, a second pressure sensitive adhesive layer 22 formed on the second base surface 11b, and a second pressure sensitive adhesive layer 22 formed on the second pressure sensitive adhesive layer 21, And a second peeling film (32) laminated on the pressure sensitive adhesive layer (22).

The first pressure sensitive adhesive layer (21) and the second pressure sensitive adhesive layer (22) contain a silicone pressure sensitive adhesive.

The first pressure sensitive adhesive layer (21) preferably contains an antistatic agent. Further, the second pressure sensitive adhesive layer (22) can also contain an antistatic agent.

The shape of the double-sided silicone adhesive sheet 1 can be any shape such as a sheet, a tape, or a label.

(materials)

As the base material 11, for example, a sheet material such as a synthetic resin film can be used. Examples of the synthetic resin film include a polyimide film, a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a polymethylpentene film, a polyvinyl chloride film, a vinyl chloride copolymer film, a polyethylene terephthalate film, (Meth) acrylic acid copolymer film, an ethylene / (meth) acrylate copolymer film, a polystyrene film, a polyethylene terephthalate film, a polybutylene terephthalate film, a polyurethane film, an ethylene / vinyl acetate copolymer film, an ionomer resin film, A film, and a polycarbonate film. In addition, examples of the substrate 11 include a crosslinked film and a laminated film of these synthetic resin films. The substrate 11 may have antistatic properties.

From the viewpoint of heat resistance, the base material 11 is preferably a polyimide film.

It is preferable that the substrate 11 is a long film (strip). By using the elongated base material 11, it is possible to produce a double-sided silicone pressure-sensitive adhesive sheet 1 of a long-form, so-called roll-to-roll production, .

The thickness of the base material 11 is preferably 10 mu m or more and 500 mu m or less, more preferably 15 mu m or more and 300 mu m or less, and still more preferably 20 mu m or more and 250 mu m or less.

(Pressure-sensitive adhesive layer)

The pressure-sensitive adhesive composition constituting the first pressure-sensitive adhesive layer (21) and the second pressure-sensitive adhesive layer (22) contains a silicone pressure-sensitive adhesive. The silicone pressure sensitive adhesive contained in the pressure sensitive adhesive composition of the first pressure sensitive adhesive layer 21 and the silicone pressure sensitive adhesive contained in the pressure sensitive adhesive composition of the second pressure sensitive adhesive layer 22 may be the same or different.

The pressure-sensitive adhesive composition constituting the first pressure-sensitive adhesive layer (21) preferably contains a silicone-based pressure-sensitive adhesive and an antistatic agent. Details of the antistatic agent will be described later.

The pressure-sensitive adhesive composition constituting the second pressure-sensitive adhesive layer (22) contains a silicone-based pressure-sensitive adhesive, and may further contain an antistatic agent or may not contain an antistatic agent.

The thicknesses of the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 are preferably independently from 1 탆 to 100 탆, more preferably from 2 탆 to 80 탆, further preferably from 5 탆 to 50 탆 Is more preferable. When the thicknesses of the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 are less than 1 m, there is a possibility that the adhesive force of the obtained pressure-sensitive adhesive tape is not sufficient. On the other hand, when the thickness of the first pressure-sensitive adhesive layer 21 and the thickness of the second pressure-sensitive adhesive layer 22 exceeds 100 m, the adhesion performance is not improved and it is not economical. If the thicknesses of the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 are more than 100 占 퐉, there is a possibility that the pressure-sensitive adhesive may be released during the application of the pressure- May cause cohesive failure of the pressure-sensitive adhesive layer when peeling off the adherend from the adherend.

· Silicone-based adhesive

Examples of the silicone-based pressure-sensitive adhesive include pressure-sensitive adhesives containing organopolysiloxane, and pressure-sensitive adhesives containing dimethylpolysiloxane are preferred. More specifically, examples of the silicone-based pressure-sensitive adhesive include dimethylpolysiloxane having an unsaturated group such as an unsaturated group such as a vinyl group, a crosslinking agent containing a hydrosilyl group (SiH group), and an organopolysiloxane having an unsaturated group such as a vinyl group, Or a peroxide-curing type silicone-based pressure-sensitive adhesive obtained by curing with an organic peroxide such as BPO can be used. BPO is an abbreviation for Benzoylperoxide. From the viewpoint of heat resistance, the addition reaction type silicone based pressure sensitive adhesive is preferable. In this case, it is possible to adjust the crosslinking density according to the density of the unsaturated group in consideration of the obtained adhesive force. In order to form this silicone-based pressure-sensitive adhesive layer, it is necessary to perform heating or the like in order to perform addition polymerization.

· Antistatic agent

The antistatic agent is not particularly limited. As the antistatic agent, a compound capable of being uniformly dispersed in the silicone-based pressure-sensitive adhesive composition by mixing with the silicone-based pressure-sensitive adhesive composition is preferable. Examples of the antistatic agent include an ion conductive antistatic agent and conductive fine particles. As another antistatic agent, an ion-conductive silicone-based compound may be mentioned. The antistatic agent is preferably an ion-conductive antistatic agent or an ion-conductive silicone-based compound, and more preferably an ion-conductive silicone-based compound. The ionic conductive silicone compound is not particularly limited. Examples of the ion-conductive silicone-based compound include an ionic group-containing silicone oligomer, a silicone oil in which an alkali metal salt is dissolved, and an ionic group-containing silicone polymer. Among them, a silicone oligomer containing an ionic group or a silicone oil in which an alkali metal salt is dissolved is preferable from the viewpoint of good dispersibility with the silicone-based pressure-sensitive adhesive composition and excellent heat resistance and antistatic property. Examples of commercially available products include X-40-2750, X-40-2450, X-40-9310 (trade name) manufactured by Shin-Etsu Chemical Industry Co., And the like. The alkali metal salt to be dissolved in the silicone oil is preferably a lithium salt. When the pressure-sensitive adhesive composition of the second pressure-sensitive adhesive layer 22 contains an antistatic agent, an antistatic agent (sometimes referred to as a first antistatic agent) contained in the pressure-sensitive adhesive composition of the first pressure-sensitive adhesive layer 21, The antistatic agent (sometimes referred to as a second antistatic agent) contained in the pressure-sensitive adhesive composition of the pressure-sensitive adhesive layer 22 may be the same or different.

The content of the antistatic agent is preferably 0.1% by mass or more and 50% by mass or less with respect to the pressure-sensitive adhesive composition (when the pressure-sensitive adhesive composition is 100% by mass) constituting the first pressure-sensitive adhesive layer 21 and the second pressure- , And more preferably 1.0 mass% or more and 40 mass% or less. The content of the first antistatic agent contained in the pressure sensitive adhesive composition of the first pressure sensitive adhesive layer 21 and the content of the second antistatic agent contained in the pressure sensitive adhesive composition of the second pressure sensitive adhesive layer 22 may be the same or different .

· Other ingredients

The pressure-sensitive adhesive composition constituting the first pressure-sensitive adhesive layer (21) and the second pressure-sensitive adhesive layer (22) may contain other components as long as the effect of the present invention is not impaired. Examples of other components that can be contained in the pressure-sensitive adhesive composition include a flame retardant, a tackifier, an ultraviolet absorber, an antioxidant, an antiseptic, an antiseptic, a plasticizer, a defoamer, and a wettability adjuster.

(Peeling film)

The first release film 31 and the second release film 32 are not particularly limited. For example, in terms of ease of handling, the release film preferably has a release substrate and a release agent layer formed by applying a release agent on at least one side of the release substrate.

When the first release film 31 and the second release film 32 are provided with a release substrate, the release substrate of the first release film 31 and the release substrate of the second release film 32 may be the same Or may be different.

When the first release film 31 and the second release film 32 are provided with the release agent layer, the release agent layer of the first release film 31 and the release agent layer of the second release film 32 are formed of the same release agent Or may be formed of a different exfoliating agent.

The release substrate includes, for example, a paper substrate, a laminate paper obtained by laminating a thermoplastic resin such as polyethylene on the paper substrate, and a plastic film.

Examples of the paper substrate include a gloss paper, a coated paper, and a cast coated paper. Examples of the plastic film include polyester films such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, and polyolefin films such as polypropylene and polyethylene.

Examples of the releasing agent include olefin resins, rubber elastomers (e.g., butadiene resins and isoprene resins), long chain alkyl resins, alkyd resins, fluororesins, and silicone resins. Among them, the exfoliating agent is preferably a releasing agent selected from the group consisting of an olefin resin, a rubber elastomer (e.g., butadiene resin, isoprene resin, etc.), a long chain alkyl resin, an alkyd resin, and a fluorine resin More preferably a fluorine-based resin. There is a problem that the release film using a general silicone-based resin tends to be heavy to the pressure-sensitive adhesive layer containing the silicone-based pressure-sensitive adhesive. Therefore, if the peeling agent layer of the first peeling film 31 and the second peeling film 32 is a fluorine-based resin, the peeling of the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 containing the silicone- Side double-sided silicone pressure-sensitive adhesive sheet 1 having good releasability can be obtained. The release agent layer may further contain an antistatic agent and may not contain an antistatic agent.

The thickness of the first release film 31 and the second release film 32 is not particularly limited. The thickness of the first release film 31 and the second release film 32 is preferably 20 mu m or more and 200 mu m or less, more preferably 25 mu m or more and 150 mu m or less.

The thickness of the release agent layer is not particularly limited. When the release agent layer is formed by applying the solution containing the release agent on the release agent, the thickness of the release agent layer is preferably 0.01 m or more and 2.0 m or less, more preferably 0.03 m or more and 1.0 m or less.

When a plastic film is used as the release substrate, the thickness of the plastic film is preferably 3 mu m or more and 50 mu m or less, more preferably 5 mu m or more and 40 mu m or less.

Other layers

The double-sided silicone pressure-sensitive adhesive sheet 1 can be produced by a method in which other than the substrate 11, the first pressure-sensitive adhesive layer 21, the first release film 31, the second pressure-sensitive adhesive layer 22 and the second release film 32, Layer may be additionally provided.

[Method of producing double-sided silicone adhesive sheet]

A method of manufacturing the double-sided silicone adhesive sheet 1 according to the present embodiment will be described.

The method for producing a double-sided pressure sensitive adhesive sheet 1 according to the present embodiment is a method for producing a double-sided pressure sensitive adhesive sheet 1 by applying a first coating liquid containing a silicone- based tackifier and an antistatic agent to a first base surface 11a of a base material 11, A step of laminating the first release film 31 on the first pressure sensitive adhesive layer 21 and a step of laminating the second release film 31 on the side of the base material 11 opposite to the first base surface 11a, The second pressure sensitive adhesive liquid is applied to the first pressure sensitive adhesive layer 11b to form the second pressure sensitive adhesive layer 22 and the second pressure sensitive adhesive layer 22 is laminated on the second pressure sensitive adhesive layer 22, As shown in Fig.

The first coating liquid and the second coating liquid can be prepared by diluting the silicone-based pressure-sensitive adhesive composition with an organic solvent.

Examples of the organic solvent include toluene, ethyl acetate, methyl ethyl ketone, and the like. The method of applying the coating liquid is not particularly limited. Examples of the application method include spray coating, bar coating, knife coating, roll knife coating, roll coating, blade coating, die coating, and gravure coating.

In order to prevent the organic solvent and the low boiling point component from remaining in the first pressure sensitive adhesive layer 21 and the second pressure sensitive adhesive layer 22, the coating liquid is applied to the substrate 11, and then the coated film is heated and dried. When a crosslinking agent is blended in the pressure-sensitive adhesive composition, it is preferable to heat the coating film to improve the cohesive force by progressing the crosslinking reaction.

Fig. 2 shows a schematic view for explaining the adhesive sheet production apparatus 100A of the double-sided silicone adhesive sheet 1 according to the present embodiment.

The adhesive sheet production apparatus 100A includes a first roll feed portion 100, a coating portion 200, a drying portion 300, a second roll feed portion 400, an engaging portion 500, And a roll winding portion 600.

The first roll feeding portion 100 feeds the rolled-up base material 11 and the one-sided silicone adhesive sheet 10 (see Fig. 3C).

The application unit 200 forms a pressure-sensitive adhesive layer by applying a coating liquid to the base material 11 and the one-sided silicone pressure-sensitive adhesive sheet 10 delivered from the first roll-feeding unit 100.

The drying unit 300 dries the pressure-sensitive adhesive layer to remove organic solvents and the like contained in the coating liquid.

The second roll feeding portion 400 feeds the peeling film rolled up in a roll form.

The joining part 500 laminates the peeling film fed from the second roll feeding part 400 to the pressure sensitive adhesive layer dried in the drying part 300.

The roll winding portion 600 winds the release sheet (the one-sided silicone pressure-sensitive adhesive sheet 10 and the double-sided silicone pressure-sensitive adhesive sheet 1) in a rolled form after the laminated film is laminated.

3A to 3E are schematic diagrams for explaining a method of manufacturing the double-sided silicone adhesive sheet 1 according to the present embodiment. In the present embodiment, a method of manufacturing using the adhesive sheet production apparatus 100A will be described as an example. The double-sided silicone adhesive sheet 1 according to the present embodiment is specifically manufactured through the following steps.

Fig. 3A shows a schematic cross-sectional view of a substrate 11 having a first substrate surface 11a and a second substrate surface 11b. In this embodiment, first, the elongated base material 11 rolled up in a roll is installed in the first roll feeder 100.

Next, the base material 11 is fed out from the first roll feed portion 100 so that the first base material surface 11a is the upper surface, and is conveyed to the application portion 200. [ A first coating liquid containing a silicone-based tackifier and an antistatic agent is applied to the first base surface 11a of the base material 11 in the application portion 200 to form the first pressure-sensitive adhesive layer 21 (see Fig. 3B) . Thereafter, the first laminate having the base material 11 and the first pressure-sensitive adhesive layer 21 is conveyed from the application portion 200 to the drying portion 300, and the first pressure-sensitive adhesive layer 21 is dried.

The first laminate is transported from the drying section 300 to the attaching section 500 to laminate the first peeling film 31 on the first pressure sensitive adhesive layer 21 (see Fig. 3C). The first peeling film 31 is a long film wound in the form of a roll and is fed out from the second roll feeding portion 400 and conveyed to the joining portion 500. In the joining portion 500, Lt; / RTI >

Thus, a second laminate (single-sided silicone adhesive sheet 10) having a first pressure-sensitive adhesive layer 21 between the base material 11 and the first release film 31 is obtained (see Fig. 3C).

The manufacturing method according to the present embodiment has a step of winding the one-sided silicone adhesive sheet 10 into a roll form before forming the second pressure sensitive adhesive layer 22.

The manufacturing method according to the present embodiment is further characterized in that the roll-wound single-sided silicone adhesive sheet 10 is further provided on the first roll feed portion 100 of Fig. 2 and the second base surface 11b is the upper surface And has a step of feeding. The discharged single-sided silicone adhesive sheet 10 is conveyed to the application unit 200.

A second pressure-sensitive adhesive solution containing a silicone-based pressure-sensitive adhesive is applied to the second base surface 11b of the one-side silicone pressure-sensitive adhesive sheet 10 conveyed to the application portion 200 to form a second pressure-sensitive adhesive layer 22 Reference). Thereafter, the third layered product (laminate having the base material 11, the first pressure-sensitive adhesive layer 21, the first release film 31 and the second pressure-sensitive adhesive layer 22) (300), and the second pressure sensitive adhesive layer (22) is dried.

The third layered product is transported from the drying unit 300 to the attaching unit 500 and the second peeling film 32 is laminated on the second pressure sensitive adhesive layer 22 (see FIG. 3E). The second peeling film 32 is a long film wound in a roll shape and is fed out from the second roll feeding portion 400 and conveyed to the joining portion 500. In the joining portion 500, Lt; / RTI >

In this way, the first pressure sensitive adhesive layer 21 is provided between the base material 11 and the first release film 31 and the second pressure sensitive adhesive layer 22 is provided between the base material 11 and the second release film 32. [ (See Fig. 3E). The double-sided silicone adhesive sheet 1 shown in Fig.

The double-sided silicone adhesive sheet 1 thus produced is wound in a roll form, for example, in the roll winding portion 600 shown in Fig.

The double-sided silicone adhesive sheet 1 according to the present embodiment can be manufactured using the adhesive sheet production apparatus 100A. The present invention is not limited to the method for producing the double-sided silicone adhesive sheet 1 which is carried out by using the double-sided silicone adhesive sheet 1 and the adhesive sheet producing apparatus 100A manufactured by using the adhesive sheet producing apparatus 100A .

The first and second coating liquids and the second coating liquid are applied directly to the substrate 11 to form the first pressure sensitive adhesive layer 21 and the second pressure sensitive adhesive layer 22 in order to obtain the adhesion between the silicone pressure sensitive adhesive and the substrate 11. [ .

The charge amount of the one-sided silicone adhesive sheet 10 is preferably 10 kV or less. The charge amount of the one-sided silicone adhesive sheet 10 is a value measured by the method of the later-described embodiment. If the amount of charge of the single-sided silicone adhesive sheet 10 is 10 kV or less, there is no fear of ignition, and the second pressure-sensitive adhesive composition can be applied by a direct coating method.

[Effect of Embodiment]

According to the method for producing a double-faced silicone pressure-sensitive adhesive sheet according to the present embodiment, in the step of producing a double-faced silicone pressure-sensitive adhesive sheet by a direct coating method, the silicone pressure- The organic solvent of the liquid is not liable to ignite, and the double-sided silicone adhesive sheet can be safely produced.

The double-sided silicone pressure-sensitive adhesive sheet according to the present embodiment can be used as a double-sided pressure-sensitive adhesive sheet with high safety, in which an increase in charge amount is suppressed.

The double-sided silicone adhesive sheet according to the present embodiment can be used as a double-sided silicone adhesive sheet containing a heat-resistant silicone adhesive. The double-sided silicone adhesive sheet according to the present embodiment can be suitably used in a manufacturing process of an electronic device requiring high-temperature conditions, for example. Further, in the double-faced silicone pressure-sensitive adhesive sheet according to the present embodiment, by using a heat-resistant polyimide film as the substrate, it can be more preferably used in the manufacturing process of the electronic device.

[Modification of Embodiment]

The present invention is not limited to the above embodiments at all. The present invention includes aspects and the like in which the above-described embodiments are modified, within the scope of achieving the object of the present invention.

Another aspect of the double-sided silicone pressure-sensitive adhesive sheet includes a base 11, a first pressure-sensitive adhesive layer 21 formed on the first base surface 11a, and a first pressure- And a second pressure sensitive adhesive layer 22 formed on the second substrate surface 11b and the second pressure sensitive adhesive layer 22 is provided with a second release film 32 , And a double-sided silicone adhesive sheet 1A. The both-side peeling film 33 has peelability on both sides. The double-sided release film 33 preferably includes a release substrate and a release agent layer formed on both sides of the release substrate. The release base material and the release agent layer of the double-sided release film 33 may be the same release substrate and release agent layer as the first release film 31 and the second release film 32.

When the double-sided silicone adhesive sheet 1A is a sheet piece, a plurality of double-sided silicone adhesive sheets 1A may be laminated to form a laminate. In this laminate, the second pressure-sensitive adhesive layer 22 of the other double-sided silicone pressure-sensitive adhesive sheet 1A can be laminated on the outer surface side of the double-side peeling film 33 of the double-sided silicone pressure-sensitive adhesive sheet 1A. With such a laminated state, the double-sided silicone adhesive sheet 1A on the sheet piece can be peeled from the laminate one by one while protecting the second pressure-sensitive adhesive layer 22.

In the case where the double-sided silicone adhesive sheet 1A is a long sheet, it can be rolled into a core and stored.

In the above embodiment, a method of forming the first pressure-sensitive adhesive layer by applying the first coating liquid containing the silicone-based pressure-sensitive adhesive and the antistatic agent is described as an example of a method of obtaining the one-side silicone pressure- The invention is not limited to such an embodiment. As a one-sided silicone adhesive sheet having antistatic properties, the following aspects can be cited.

In the first aspect, a one-sided silicone adhesive sheet in which the base material is a base material having antistatic properties (antistatic base material) is exemplified. As a modification of the first embodiment, the first pressure sensitive adhesive layer may be a one-sided silicone pressure sensitive adhesive sheet containing no antistatic agent, or a one-sided silicone pressure sensitive adhesive sheet in which the first pressure sensitive adhesive layer further contains an antistatic agent. In the first embodiment and the modification of the first embodiment, the first release film may have antistatic property and may not have antistatic property.

As a method of forming a pressure-sensitive adhesive layer not containing an antistatic agent, for example, there can be mentioned a method of preparing a coating solution containing no antistatic agent, applying the coating solution to a substrate and drying.

In a second aspect, a one-side silicone adhesive sheet having an antistatic layer on at least one of the first base surface of the base material and the second base material surface on the opposite side may be mentioned. When the antistatic layer is formed on the first substrate side, the first pressure sensitive adhesive layer is formed on the antistatic layer. When the antistatic layer is formed on the second substrate side, the first pressure-sensitive adhesive layer is formed on the first substrate surface, and the second pressure-sensitive adhesive layer is formed on the antistatic layer. As a modification of the second embodiment, the first pressure sensitive adhesive layer may be a one side silicone pressure sensitive adhesive sheet containing no antistatic agent or a one side silicone pressure sensitive adhesive sheet in which the first pressure sensitive adhesive layer further contains an antistatic agent.

In the modifications of the second embodiment and the second embodiment, the base material may have antistatic properties and may not have antistatic properties. In the modifications of the second embodiment and the second embodiment, the first release film may have antistatic property and may not have antistatic property.

In a third aspect, a one-sided silicone adhesive sheet in which a first peelable film having antistatic properties is laminated on the first pressure sensitive adhesive layer may be mentioned. As the first release film having antistatic property, a release film comprising a release substrate and a release agent layer as in the release film described in the above embodiment, wherein at least one of the release substrate and the release agent layer is a release film having antistatic properties . The case where the release agent layer has antistatic property includes, for example, a case where an antistatic agent is added to the release agent layer. As a modification of the third embodiment, there may be mentioned a one-sided silicone adhesive sheet in which the first pressure sensitive adhesive layer contains no antistatic agent, or a one-sided silicone pressure sensitive adhesive sheet in which the first pressure sensitive adhesive layer further contains an antistatic agent. In the modifications of the third aspect and the third aspect, the base material may have antistatic properties and may not have antistatic properties.

In a fourth aspect, a one-sided silicone adhesive sheet in the case where the silicone-based pressure-sensitive adhesive contained in the first pressure-sensitive adhesive layer has antistatic properties can be mentioned. In the case of the fourth aspect, even if the first pressure sensitive adhesive layer does not contain an antistatic agent, the first pressure sensitive adhesive layer has antistatic performance. Examples of the silicone pressure sensitive adhesive having antistatic properties include an addition reaction type silicone pressure sensitive adhesive having an ionic group. In the fourth aspect, the base material may have antistatic properties and may not have antistatic properties. In the fourth aspect, the first release film may have antistatic property and may not have antistatic property.

Example

[Preparation of pressure-sensitive adhesive composition]

(1) Pressure-sensitive adhesive composition A

100 parts by mass of an addition reaction type silicone adhesive (product name: SD4570PSA, solid content 60% by mass, silicone resin content 60% by mass, addition reaction type silicone containing a crosslinking agent) manufactured by Toray Dow Corning Co., (Product name: SRX-212, solid content: 100 mass%) and 0.9 parts by mass of silicone oil (PC-3462 manufactured by Marubishi Yuka Kogyo K.K.) dissolved in a lithium salt as an antistatic agent, (Solid content: 62% by mass) was added to prepare a pressure-sensitive adhesive composition A, and the pressure-sensitive adhesive composition A was diluted with toluene to prepare a coating solution AL having a solid content concentration of 25 mass%.

(2) Pressure-sensitive adhesive composition B

Except that the antistatic agent contained in the pressure-sensitive adhesive composition A was changed to an ionic group-containing silicone oligomer (X-40-2750, manufactured by Shin-Etsu Chemical Co., Ltd., solids content 100% by mass), and the addition amount was adjusted to 6 parts by mass. A, a pressure-sensitive adhesive composition B was prepared. This pressure-sensitive adhesive composition B was diluted with toluene to prepare a coating solution BL having a solid content concentration of 25 mass%.

(3) Pressure-sensitive adhesive composition C

A pressure-sensitive adhesive composition C was prepared in the same manner as the pressure-sensitive adhesive composition A, except that the antistatic agent contained in the pressure-sensitive adhesive composition A was not contained. This pressure-sensitive adhesive composition C was diluted with toluene to prepare a coating solution CL having a solid content concentration of 25 mass%.

[Production of double-sided silicone adhesive sheet]

(Example 1)

The prepared coating solution AL was applied to a first base surface of a polyimide film (CATON 100H, thickness 25 mu m, manufactured by Toray DuPont Co., Ltd.) as a base material, and the prepared coating solution AL was applied on a comma coater (registered trademark) , Passed through a drying furnace, dried at an air speed of 5 m / sec, at a drying temperature of 120 캜 for a drying time of 60 seconds, and further, a release film made of a 38 탆 polyethylene terephthalate film having a fluorine release layer formed thereon (Manufactured by Lintec Corporation; SP-PET38YSD] was laminated to prepare a one-side silicone adhesive sheet having a substrate / first pressure-sensitive adhesive layer / first release film structure. This single-sided silicone adhesive sheet was wound in a roll shape. Further, the antireflection performance described later was evaluated using this single-sided silicone adhesive sheet.

Then, the single-sided silicone adhesive sheet was taken out from the obtained single-sided silicone adhesive sheet, and the prepared coating solution CL was applied to the second substrate surface of the substrate using a comma coater (registered trademark) so as to have a thickness of 20 mu m after drying And dried in a drying furnace at an air speed of 5 m / sec, a drying temperature of 120 캜 and a drying time of 60 seconds. Further, a release film made of a 38 탆 polyethylene terephthalate film having a fluorine release layer formed thereon Manufacture; SP-PET38YSD] was laminated and rolled up to prepare a double-sided silicone adhesive sheet having a second release film / second pressure-sensitive adhesive layer / substrate / first pressure-sensitive adhesive layer / first release film structure.

(Example 2)

The single-faced silicone adhesive sheet and double-faced silicone adhesive sheet of Example 2 were produced in the same manner as in Example 1, except that the coating solution AL in Example 1 was changed to the coating solution BL. The antireflection performance described later was evaluated using this single-sided silicone adhesive sheet.

(Comparative Example 1)

In Comparative Example 1, a single-sided silicone adhesive sheet was produced in the same manner as in Example 1, except that the coating solution AL in Example 1 was changed to the coating solution CL. It was determined that there was a fear of ignition because static electricity was generated in the step of feeding out the roll of the one-sided silicone adhesive sheet, and the subsequent steps were stopped. The antistatic performance to be described later was evaluated on a one-sided silicone adhesive sheet.

[Evaluation of antistatic performance]

The charge amount of the one-sided silicone adhesive sheet was measured by the following method.

In each of the Examples and Comparative Examples, a plurality of test pieces of A4 size were prepared from the single-sided silicone adhesive sheets on the rolls thus obtained. A plurality of test pieces were superimposed to produce a laminate. The laminate was allowed to stand. Thereafter, one test piece was taken out from the outermost layer of the laminate, and the charge amount of one test piece after 60 seconds passed from the laminate was measured. The charge amount was measured by a digital electrostatic potential meter (KSD-0108, manufactured by Kasuga Electric Co., Ltd.). The A4 size refers to a size of 210 mm in length and 297 mm in width.

Table 1 shows the evaluation results of the antistatic performance of the test pieces related to Examples 1, 2 and Comparative Example 1 described above. The content of the antistatic agent in Table 1 is the content in the total solid content of the pressure-sensitive adhesive composition.

The one-sided silicone pressure-sensitive adhesive sheet according to the embodiment containing the antistatic agent in the first pressure-sensitive adhesive layer has a small electrification amount and can be used in a process of producing a double-sided silicone pressure-sensitive adhesive sheet by a direct application method, The organic solvent of the silicone-based pressure-sensitive adhesive coating liquid is not likely to be ignited by the static electricity of the pressure-sensitive adhesive sheet, and the double-sided silicone pressure-sensitive adhesive sheet can be safely produced.

1: Double-sided silicone adhesive sheet
11: substrate
11a: first base surface
11b: a second substrate surface
21: first pressure-sensitive adhesive layer
22: second pressure-sensitive adhesive layer
31: First release film
32: Second release film
33: Double-sided release film

Claims (15)

A step of forming a first pressure-sensitive adhesive layer by applying a first coating liquid containing a silicone-based pressure-sensitive adhesive on a first base material side of a substrate,
A step of laminating a first release film on the first pressure sensitive adhesive layer to obtain a one side silicone pressure sensitive adhesive sheet having antistatic properties,
A step of winding the single-sided silicone adhesive sheet in a roll form,
A step of feeding out the single-sided silicone adhesive sheet wound in a roll form,
A step of forming a second pressure-sensitive adhesive layer by applying a second coating liquid containing a silicone-based pressure-sensitive adhesive on a second base material side of the substrate opposite to the first base material side,
A step of laminating a second release film on the second pressure-sensitive adhesive layer, and winding up the second release film in a roll form. The method according to claim 1,
Wherein the first coating liquid contains an antistatic agent. 3. The method of claim 2,
Wherein the antistatic agent contained in the first coating liquid is an ion-conductive silicone-based compound. 3. The method of claim 2,
Wherein the antistatic agent contained in the first coating liquid is a silicone oil in which an ionic group-containing silicone oligomer or an alkali metal salt is dissolved. 5. The method according to any one of claims 1 to 4,
Wherein the second coating liquid contains an antistatic agent. 6. The method according to any one of claims 1 to 5,
Wherein the substrate is a long-length, double-sided silicone adhesive sheet. 7. The method according to any one of claims 1 to 6,
Wherein the base material is a polyimide film. 8. The method according to any one of claims 1 to 7,
A plurality of test pieces of A4 size are prepared from the single-sided one-side silicone adhesive sheet on a roll, a plurality of test pieces are stacked to prepare a laminate, a piece of the test piece is taken out from the outermost layer of the laminate, Wherein the charging amount of one piece of the test piece after 60 seconds elapsing after taking out one piece of the test piece is 10 kV or less. A substrate having a first substrate side and a second substrate side opposite to the first substrate side;
A first pressure-sensitive adhesive layer formed on the first base surface,
A first peeling film laminated on the first pressure-sensitive adhesive layer,
A second pressure-sensitive adhesive layer formed on the second base surface,
And a second peeling film laminated on the second pressure sensitive adhesive layer,
Wherein the first pressure sensitive adhesive layer and the second pressure sensitive adhesive layer contain a silicone pressure sensitive adhesive,
Wherein the first pressure-sensitive adhesive layer has an antistatic property. 10. The method of claim 9,
The substrate is a long sheet, double-faced silicone adhesive sheet. 11. The method according to claim 9 or 10,
Wherein the substrate is a polyimide film. 12. The method according to any one of claims 9 to 11,
Wherein the first pressure sensitive adhesive layer contains an antistatic agent. 13. The method of claim 12,
Wherein the antistatic agent contained in the first pressure-sensitive adhesive layer is an ion-conductive silicone-based compound. 13. The method of claim 12,
Wherein the antistatic agent contained in the first pressure-sensitive adhesive layer is a silicone oil in which an ionic group-containing silicone oligomer or an alkali metal salt is dissolved. 15. The method according to any one of claims 9 to 14,
Wherein the second pressure sensitive adhesive layer contains an antistatic agent.

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