TWI477574B - Adhesive tape with functional film and transfer method for functional film - Google Patents

Description

Transfer film with functional film and transfer method of functional film

The present invention relates to a method of transferring an adhesive tape and a functional film having a functional film such as an inorganic sealing film.

In recent years, devices such as solar energy and flat-panel displays are mainly composed of a functional material such as a sealing film, and are made of an organic material, and are made to be flexible, lightweight, thinned, and large-sized. (for example, refer to Patent Documents 1 and 2).

However, the sealing film (organic sealing film) formed of an organic material has a poor gas barrier property as compared with a sealing film (inorganic sealing film) formed of an inorganic material such as glass. Therefore, the device sealed by the organic sealing film is easily deteriorated by the influence of moisture and oxygen in the outside air, and has a problem of short life.

On the other hand, in the case where an inorganic sealing film is used instead of the organic sealing film, it is necessary to thin the inorganic sealing film for the purpose of weight reduction or the like. However, the thinned inorganic sealing film is weak in strength and is easily broken during transportation. Patent Document 3 discloses a transfer sheet for forming a wiring board formed by sequentially depositing a fluorine-containing silicone rubber layer and a metal foil on a resin film. According to the transfer sheet, it is considered that the inorganic sealing film can be used more safely by laminating the thinned inorganic sealing film on the polyoxysulfide rubber layer instead of the metal foil.

However, the transfer sheet described in Patent Document 3 has the following problems because polyfluorene rubber is used in the adhesive layer. That is, the adhesive strength of the polyoxyethylene rubber is usually constant, and the adhesive force when holding the inorganic sealing film is substantially the same as the adhesive force at the time of taking out. Therefore, when the adhesive strength of the polyoxyxene rubber is designed to be weak and the inorganic sealing film is easily taken out, the inorganic sealing film may be peeled off from the polyoxyethylene rubber during transportation or the like. On the other hand, if the adhesive strength of the polyoxyxene rubber is designed to be strong, an excessive force is applied to the inorganic sealing film at the time of removal, and the inorganic sealing film may be deformed or broken. In addition, since the polyoxyxene rubber is expensive and cannot be reused, the recycling property is poor and uneconomical.

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2009-40951

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2009-110873

[Patent Document 3] Japanese Patent Laid-Open Publication No. 2003-60329

An object of the present invention is to provide a transfer method of a functional film-attached adhesive tape and a functional film which can safely take out a functional film and which is excellent in recyclability.

The adhesive film with a functional film of the present invention comprises a base film, an adhesive layer laminated on one side of the base film, and a functional film laminated on the surface of the adhesive layer. The pressure-sensitive adhesive layer contains a pressure-sensitive adhesive and a side chain crystalline polymer, and at the same time, at a temperature equal to or higher than the melting point of the side chain crystalline polymer, the force is lowered.

The transfer method of the functional film of the present invention is a method of transferring the functional film in the adhesive film with the functional film described above to the transfer member, which comprises the following steps (i) and (ii):

(i) a step of attaching the transfer member to the surface of the aforementioned functional film via the adhesive layer.

(ii) Next, the temperature of the adhesive layer is set to a temperature equal to or higher than the melting point of the side chain crystalline polymer to lower the adhesive force, and the functional film is taken out from the adhesive layer to form a functional film self-adhesive agent. The step of transferring the layer to the transfer member.

Further, in the present invention, the above-mentioned "functional film" means a film which has a predetermined function and which is insufficient in strength and difficult to use when used alone. In addition to the sealing function, the above functions include electrical/electronic functions (electrical conductivity, insulating properties, piezoelectricity, dielectric properties, etc.) and optical functions (reflectivity, light blocking property, polarizing property, refractive index control function, etc.). ), magnetic functions (hard magnetic, soft magnetic, non-magnetic, magnetic permeability, etc.), chemical functions (water repellency, sorption, catalytic, water absorption, ion conductivity, redox, etc.), hot Functions (heat transfer, heat insulation, thermal expansion control, etc.), etc., and other functions other than these functions.

According to the present invention, since the functional film is held by the base film and the adhesive layer provided on one side of the base film, the rigidity can be imparted to the functional film by the base film, and the adhesive layer is formed by the adhesive layer. Since it functions as a cushioning material, it can absorb the external force received by a functional film at the time of conveyance. Further, since the pressure-sensitive adhesive layer contains a pressure-sensitive adhesive and a side chain crystalline polymer, when the pressure-sensitive adhesive layer is heated to a temperature equal to or higher than the melting point of the side chain crystalline polymer, the side chain crystalline polymer is displayed. The fluidity hinders the adhesion of the pressure-sensitive adhesive, whereby the adhesive force can be lowered. Therefore, when the functional film is taken out, the adhesive force can be sufficiently lowered by heating the temperature of the adhesive layer to a temperature equal to or higher than the melting point of the side chain crystalline polymer, so that the functional film can be used safely.

Further, since the phase change of the side chain crystalline polymer is utilized, it can be reused and exhibits excellent recycling property. Further, since the adhesive layer functions as a cushioning material, it can be wound into a roll depending on the configuration of the functional film, and can also cope with a so-called roll-to-roll process. Continuous production.

<Adhesive tape with functional film>

In the following, an embodiment in which the functional film-attached adhesive tape (hereinafter sometimes referred to as "adhesive tape") of the present invention is used, and the case where the functional film is an inorganic sealing film is exemplified, and reference is made to the first. The figure will be described in detail. As shown in the figure, the functional film-attached adhesive tape 10 of the present embodiment is formed by sequentially laminating the adhesive layer 2, the inorganic sealing film 3, and the release layer 4 on one surface of the base film 1.

Examples of the substrate film 1 include polyethylene, polyethylene terephthalate, polypropylene, polyester, polyamine, polyimine, polycarbonate, ethylene-vinyl acetate copolymer, and ethylene. a synthetic resin film such as an ethyl acrylate copolymer, an ethylene-polypropylene copolymer, or a polyvinyl chloride.

The base film 1 may be composed of a single layer or a laminate, and has a thickness of about 25 to 250 μm. Thereby, rigidity can be imparted to the inorganic sealing film 3. In order to improve the adhesion to the adhesive layer 2, the substrate film 1 may be subjected to surfaces such as corona discharge treatment, plasma treatment, blast treatment, chemical etching treatment, primer treatment, and the like. deal with.

The adhesive layer 2 contains a pressure-sensitive adhesive and a side chain crystalline polymer. The pressure-sensitive adhesive is not particularly limited as long as it is a polymer having adhesiveness, and examples thereof include a natural rubber adhesive, a synthetic rubber adhesive, a styrene/butadiene latex adhesive, and an acrylic adhesive. Agents, etc.

In the case of exemplifying the acrylic adhesive, the monomer constituting the acrylic adhesive may, for example, be a (meth) acrylate having an alkyl group having 1 to 12 carbon atoms; Examples of the acrylate include ethylhexyl (meth)acrylate, methyl (meth)acrylate, ethyl (meth)acrylate, and butyl (meth)acrylate. Further, a (meth) acrylate having a hydroxyalkyl group or the like can also be used. Examples of the (meth) acrylate include hydroxyethyl (meth)acrylate and hydroxypropyl (meth)acrylate. Methyl) hydroxyhexyl acrylate and the like. These exemplified monomers may be used alone or in combination of two or more.

The polymerization method is not particularly limited, and for example, a solution polymerization method, a bulk polymerization method, a suspension polymerization method, an emulsion polymerization method, or the like can be employed. For example, when a solution polymerization method is employed, the above-exemplified monomers may be mixed to a solvent and stirred at about 40 to 90 ° C for about 2 to 10 hours, whereby the aforementioned monomers are polymerized.

The weight average molecular weight of the polymer obtained by polymerizing the above monomers is preferably from 250,000 to 1,000,000. When the weight average molecular weight is too small, when the inorganic sealing film 3 is taken out, the adhesive layer 2 remains on the inorganic sealing film 3, and there is a concern that the amount of the residue is increased. Further, if the weight average molecular weight is too large, the cohesive force of the adhesive layer 2 may become too high to lower the adhesive force. The weight average molecular weight is a value obtained by measuring the polymer by gel permeation chromatography (GPC) and converting the obtained measured value into polystyrene.

On the other hand, the side chain crystalline polymer is a polymer which crystallizes at a temperature not reaching the melting point and exhibits fluidity at a temperature equal to or higher than the melting point. That is, the side chain crystalline polymer reversibly causes a crystal state and a flow state in response to a change in temperature. In the adhesive layer 2, when the side chain crystalline polymer exhibits fluidity at a temperature equal to or higher than the melting point, the side chain crystalline polymer is contained in a ratio at which the adhesive strength is lowered. Therefore, when the inorganic sealing film 3 is taken out, when the adhesive layer 2 is heated to a temperature equal to or higher than the melting point of the side chain crystalline polymer, the side chain crystalline polymer exhibits fluidity and hinders the aforementioned pressure sensitiveness. The adhesiveness of the adhesive prevents the adhesive force from being lowered, so that the inorganic sealing film 3 can be easily taken out. Further, when the pressure-sensitive adhesive layer 2 is cooled to a temperature which does not reach the melting point of the side chain crystalline polymer, the side chain crystalline polymer is crystallized to restore the adhesiveness, so that it can be reused.

The aforementioned melting point means a temperature at which a specific portion of the polymer which has been originally integrated into an ordered arrangement is changed into an disordered state by a certain equilibrium process, and which is 10 ° C by a differential thermal scanning calorimeter (DSC). The value obtained is determined by the condition of minutes. The aforementioned melting point is 30 ° C or higher, preferably 30 to 70 ° C. If the melting point is to be a predetermined value, it can be arbitrarily carried out by changing the composition of the side chain crystalline polymer or the like.

The composition of the aforementioned side chain crystalline polymer may, for example, be 20 to 100 parts by weight of a (meth) acrylate having a linear alkyl group having 16 or more carbon atoms, and 0 to 70 parts by weight having a carbon number of 1 to A polymer of (meth) acrylate of 6 and a polymer obtained by polymerizing 0 to 10 parts by weight of a polar monomer.

Examples of the (meth)acrylic acid having a linear alkyl group having 16 or more carbon atoms include hexadecyl (meth) acrylate, octadecyl (meth) acrylate, and stearyl (meth) acrylate. And a (meth) acrylate having a linear alkyl group having 16 to 22 carbon atoms, such as behenyl (meth)acrylate. Examples of the (meth) acrylate having an alkyl group having 1 to 6 carbon atoms include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and (methyl). ) hexyl acrylate and the like. Examples of the polar monomer include a carboxyl group-containing ethylenically unsaturated monomer such as acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid or fumaric acid; and (meth)acrylic acid 2-hydroxyl group. An ethylenically unsaturated monomer having a hydroxyl group such as ethyl ester, 2-hydroxypropyl (meth)acrylate or 2-hydroxyhexyl (meth)acrylate. These may be used alone or in combination of two or more.

The polymerization method is not particularly limited, and for example, a solution polymerization method, a bulk polymerization method, a suspension polymerization method, an emulsion polymerization method, or the like can be employed. For example, when a solution polymerization method is employed, the above-exemplified monomers may be mixed to a solvent and stirred at about 40 to 90 ° C for about 2 to 10 hours, whereby the aforementioned monomers are polymerized.

The weight average molecular weight of the side chain crystalline polymer is 2,000 or more, and more preferably 2,000 to 20,000. When the weight average molecular weight is too small, when the inorganic sealing film 3 is taken out, there is a fear that the amount of the residue becomes large. In addition, if the weight average molecular weight is too large, even if the temperature of the side chain crystalline polymer is set to a temperature equal to or higher than the melting point, it is difficult to exhibit fluidity, so that the adhesive strength is hard to be lowered. The weight average molecular weight is a value obtained by measuring a side chain crystalline polymer by GPC and converting the obtained measured value into polystyrene.

In the conversion of the solid content, the side chain crystalline polymer is contained in an amount of from 1 to 20 parts by weight (more preferably from 1 to 10 parts by weight) based on 100 parts by weight of the pressure-sensitive adhesive. Thereby, sufficient adhesion can be ensured at a temperature at which the melting point of the side chain crystalline polymer is not reached, and when the side chain crystalline polymer exhibits fluidity at a temperature equal to or higher than the above melting point, the adhesive force is lowered. On the other hand, when the content of the side chain crystalline polymer is too small, even if the adhesive layer 2 is heated to a temperature equal to or higher than the melting point of the side chain crystalline polymer, the adhesion is hard to be lowered. Further, when the content of the side chain crystalline polymer is too large, the adhesive force of the adhesive layer 2 is lowered to make it difficult to hold the inorganic sealing film 3.

The thickness of the adhesive layer 2 is 15 to 400 μm, preferably 120 to 150 μm. When the thickness of the adhesive layer 2 is too small, the adhesive layer 2 hardly functions as a cushioning material, and it is difficult to absorb an external force which the inorganic sealing film 3 receives during transportation. Further, when the thickness of the adhesive layer 2 is too thick, it is difficult to prepare an adhesive layer having a uniform thickness, and it becomes difficult to stably maintain the inorganic sealing film 3.

In order to provide the adhesive layer 2 on one surface of the base film 1, a coating liquid obtained by adding a pressure-sensitive adhesive layer and a side chain crystalline polymer to a solvent at a predetermined ratio is applied to the base. One side of the material film 1 can be dried. Various additives such as a crosslinking agent, a tackifier, a plasticizer, an anti-aging agent, and an ultraviolet absorber may be added to the coating liquid. The coating can be generally carried out by a knife coater, a roll coater, a calender coater, a comma coater or the like. Further, depending on the coating thickness and the viscosity of the coating liquid, it may be carried out by a gravure coater, a bar coater or the like.

The inorganic sealing film 3 is made of an inorganic material and has a sealing function. Examples of the material constituting the inorganic sealing film 3 include glass such as quartz glass, alkali glass, soda-lime glass, lead glass, borosilicate glass, aluminosilicate glass, and silica glass; Aluminum, molybdenum, niobium and other metals.

The inorganic sealing film 3 has a thickness of 0.01 to 100 μm, preferably 0.01 to 1 μm. The inorganic sealing film 3 having such a thickness is very weak and easily broken, and has poor usability. According to the present embodiment, the inorganic sealing film 3 is supported by the base film 1 and the adhesive layer 2, and can be used safely.

The release layer 4 is a surface that protects the surface of the inorganic sealing film 3. The release layer 4 may be, for example, a release agent such as polyfluorene oxide coated on the surface of a film made of polyethylene terephthalate or the like. The thickness of the release layer 4 is suitably about 10 to 100 μm.

<Transfer method of functional film>

Next, the transfer method of the inorganic sealing film 3 in the adhesive film 10 with the functional film described above will be described in detail with reference to FIG. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and their description is omitted.

As shown in Fig. 2 (a) and (b), first, the release layer 4 of the adhesive tape 10 is moved in the direction of the arrow A, and the release layer 4 is peeled off from the inorganic sealing film 3. Thereby, the surface 3a of the inorganic sealing film 3 is exposed. Next, the adhesive tape 10a after peeling off the release layer 4 is reversed up and down in the manner shown in Fig. 2(c). Thereby, the surface 3a of the inorganic sealing film 3 is directed downward.

On the other hand, the transfer member 20 is disposed below the inorganic sealing film 3. The transfer member 20 is sealed by the inorganic sealing film 3, and examples thereof include a solar battery cell in a solar cell, a light-emitting element in a flat panel display, and the like.

An adhesive layer 21 is formed on the surface of the transfer member 20. The adhesive agent constituting the adhesive layer 21 is not particularly limited as long as the inorganic sealing film 3 and the transfer member 20 can be attached to each other. Examples thereof include a reaction-curable adhesive, a thermosetting adhesive, and an ultraviolet curing type. A photocurable adhesive such as a solvent.

Next, the layer 21 can be formed by applying the aforementioned adhesive to the surface of the transfer member 20. Further, the adhesive layer 21 can also be formed by applying the above-mentioned adhesive to the surface 3a of the inorganic sealing film 3. The thickness of layer 21 is then preferably from 1 to 100 μm, more preferably from about 10 to 50 μm.

After the adhesive layer 20 is formed on the surface of the transfer member 20, the adhesive tape 10a is moved in the direction of the arrow B. As shown in Fig. 2(d), the transfer member 20 is attached to the inorganic sealing film 3 via the adhesive layer 21. Surface 3a. This can be carried out by hardening the above-mentioned adhesive in a curing method corresponding to each of the above-exemplified adhesives.

Then, the ambient temperature is heated to a temperature equal to or higher than the melting point of the side chain crystalline polymer by a heating means such as a gas to lower the adhesion of the adhesive layer 2. In the case of using a side chain crystalline polymer having a melting point of 50 ° C, the adhesion of the pressure-sensitive adhesive layer 2 is usually sufficiently lowered by heating to about 60 ° C.

Thereafter, as shown in Fig. 2(e), the adhesive layer 2 and the base film 1 are moved in the direction of the arrow C. Thereby, the inorganic sealing film 3 is taken out from the adhesive layer 2, and the inorganic sealing film 3 is transferred from the adhesive layer 2 to the transfer member 20. At this time, since the adhesive force of the adhesive layer 2 is sufficiently lowered for the above reasons, the load applied to the inorganic sealing film 3 at the time of taking out is small.

In the adhesive tape 10b from which the inorganic sealing film 3 has been taken out, when the adhesive layer 2 is cooled to a temperature that does not reach the melting point of the side chain crystalline polymer, the side chain crystalline polymer is crystallized. Resist the adhesion. Therefore, as long as the additional inorganic sealing film 3 and the release layer 4 are sequentially laminated on the adhesive layer 2 whose adhesive force has recovered, it can be reused as a new functional film-attached adhesive tape 10.

The above is a description of the embodiments of the present invention, and the present invention is not limited to the above embodiments, and various modifications and changes can be made within the scope of the claims. For example, in the embodiment related to the adhesive tape with the functional film described above, the inorganic sealing film is exemplified as a functional film. However, the functional film according to the present invention is not limited thereto, and the inorganic functional film is not limited thereto. A functional film other than the functional film, that is, a film having a function other than the sealing function and which is insufficient in strength when used alone, is suitable for use.

Further, in the above embodiment, the case where the inorganic sealing film is directly laminated on the adhesive layer will be described. However, for example, a non-adhesive layer may be interposed between the adhesive layer and the inorganic sealing film. Thereby, the inorganic sealing film can be taken out more easily.

The aforementioned non-adhesive layer means a layer having substantially no adhesion. The non-adhesive layer is not a uniform layer covering the entire surface of the adhesive layer, but an uneven layer partially exposing the surface of the adhesive layer. That is, the non-adhesive layer is a non-adhesive layer having a shape such as a dot or a spot.

The contact area of the adhesive layer with the functional film can be adjusted by adjusting the surface area of the adhesive layer exposed from the non-adhesive layer. When the contact area is increased, the adhesive force is increased. Conversely, when the contact area is made small, the adhesive force is weak. Therefore, if the non-adhesive layer is interposed between the adhesive layer and the functional film, the adhesive force of the adhesive layer can be easily controlled, so that the functional film can be taken out more easily. Further, the ratio of the surface area of the adhesive layer exposed from the non-adhesive layer can be arbitrarily set in accordance with the adhesive force of the adhesive layer and the functional film, and is not particularly limited.

The non-adhesive layer can be formed by, for example, evaporation, spray drying, sputtering, or the like. In particular, vapor deposition is preferred from the viewpoint of efficiently forming a non-adhesive layer. When the non-adhesive layer is formed by vapor deposition, the vapor deposition may be stopped before the surface of the adhesive layer is covered with the non-adhesive layer. The same applies to the above-described spray drying and sputtering.

The composition of the non-adhesive layer may be any one that does not substantially have adhesion. Specific examples thereof include polyfluorene oxide, fluororesin, cerium oxide (SiO ₂ ), and the like, and a fluororesin is particularly preferable. Examples of the fluororesin include a tetrafluoroethylene/hexafluoropropylene copolymer (FEP), a polytetrafluoroethylene (PTFE), a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer (PFA), and the like.

The thickness of the non-adhesive layer is preferably 1 μm or less, more preferably 600 nm or less. If the thickness of the non-adhesive layer is too large, it is difficult to uniformly contact the adhesive layer with the functional film, which is not preferable. In addition, the peeling in the case where a non-adhesive layer is interposed is usually between the non-adhesive layer and the functional film.

The present invention will be described in detail below with reference to Synthesis Examples and Examples, but the present invention is not limited to the following Synthesis Examples and Examples. In addition, in the following description, "part" means the weight part.

(Synthesis Example 1)

52 parts of ethyl hexyl acrylate, 40 parts of methyl acrylate, 8 parts of hydroxyethyl acrylate, and 0.2 parts of PERBUTYL ND (manufactured by Nippon Oil Co., Ltd.) as a starter were added to 200 parts of toluene, respectively. The monomers were polymerized by stirring at 60 ° C for 5 hours. The obtained copolymer had a weight average molecular weight of 460,000.

(Synthesis Example 2)

92 parts of ethyl hexyl acrylate, 8 parts of hydroxyethyl acrylate, and 0.2 parts of PERBUTYL ND (manufactured by Nippon Oil Co., Ltd.) as a starter were added to 200 parts of toluene, respectively, and stirred at 60 ° C for 5 hours. The monomers are polymerized. The obtained copolymer had a weight average molecular weight of 470,000.

(Synthesis Example 3)

40 parts of behenyl acrylate, 35 parts of octadecyl acrylate, 20 parts of methyl acrylate, 5 parts of acrylic acid, dodecyl mercaptan as a chain transfer agent, and as A ratio of 1.0 part of PERHEXYL PV (manufactured by NOF Corporation) of the initiator was added to 100 parts of toluene, and the mixture was stirred at 80 ° C for 5 hours to polymerize the monomers. The obtained copolymer had a weight average molecular weight of 8,000 and a melting point of 52 °C.

(Synthesis Example 4)

95 parts of octadecyl acrylate, 5 parts of acrylic acid, 5 parts of dodecyl thiol as a chain transfer agent, and 1.0 part of PERHEXYL PV (manufactured by NOF Corporation) as a starter were added to 100 parts, respectively. Toluene was stirred at 80 ° C for 5 hours to polymerize the monomers. The obtained copolymer had a weight average molecular weight of 8,500 and a melting point of 51 °C.

Each of the copolymers of the above Synthesis Examples 1 to 4 is shown in Table 1. Here, the weight average molecular weight is a value obtained by measuring the copolymer by GPC and converting the obtained measured value into polystyrene. The above melting point is a value measured by DSC using a measurement condition of 10 ° C /min.

(Example 1)

To 100 parts of the copolymer solution of Synthesis Example 1 obtained above, 5 parts of the copolymer solution of Synthesis Example 3 and 0.5 part of an isocyanate crosslinking agent in terms of solid content were added to obtain an adhesive solution, and the adhesive solution was adhered thereto. The solution solution was applied to one side of a polyethylene terephthalate film having a thickness of 100 μm and dried to prepare an adhesive tape having an adhesive layer having a thickness of 30 μm.

(Example 2)

A polyethylene terephthalate having a thickness of 100 μm was produced in the same manner as in Example 1 except that the copolymer solution of Synthesis Example 2 was used instead of Synthesis Example 1 and the copolymer solution of Synthesis Example 4 was used instead of Synthesis Example 3. An adhesive tape having an adhesive layer having a thickness of 30 μm was formed on one side of the diester film.

(Example 3)

The non-adhesive layer was formed on the surface of the adhesive layer in the adhesive tape of the foregoing Example 1. The formation conditions are as follows.

(non-adhesive layer)

Composition: fluororesin (PTFE)

Shape: dot

Thickness: 500nm

Forming method: evaporation

The conditions of the vapor deposition described below are as follows.

(evaporation)

Ambient temperature: 200 ° C

Vacuum degree: 10 ^-2 Torr (torr)

[Comparative Example 1]

Adhesive was obtained by adding 2.4 parts of a crosslinking agent ("M-5A" manufactured by Soken Chemical Co., Ltd.) in a solid content to 100 parts of an acrylic adhesive ("SK-1340" manufactured by Soken Chemical Co., Ltd.). In the solution solution, the adhesive solution was applied to one side of a polyethylene terephthalate film having a thickness of 100 μm and dried to prepare an adhesive tape having an adhesive layer having a thickness of 30 μm.

<evaluation>

The take-out property of the inorganic sealing film was evaluated for each of the adhesive tapes obtained above. The evaluation methods are as follows, and the results are shown in Table 2.

(Extraction of inorganic sealing film)

As the inorganic sealing film, an aluminum film having a thickness of 50 μm and a quartz glass film were used. These inorganic sealing films were laminated on the surface of the above-mentioned adhesive layer at an ambient temperature of 23 °C. Next, an acrylic pressure-sensitive adhesive tape ("No-535A" manufactured by Nitto Denko Corporation) was attached to the surface of each inorganic sealing film. Then, after raising the ambient temperature from 23 ° C to 60 ° C, the acrylic adhesive tape was gently picked up with a finger, thereby evaluating the take-out property of the inorganic sealing film. The evaluation criteria are set in the following manner.

○: The inorganic sealing film can be easily taken out from the adhesive layer without damage.

△: Although a certain load was applied, the inorganic sealing film was taken out from the adhesive layer without damage in the range of no problem in practical use.

╳: A large load is applied to deform or break the inorganic sealing film.

As can be seen from Table 2, in Comparative Examples 1, Examples 1 to 3 were excellent in the extractability of the inorganic sealing film. In particular, Example 3 provided with a non-adhesive layer showed superior take-up property than Example 1. Further, in Example 3, the peeling occurred between the non-adhesive layer and the inorganic sealing film.

1. . . Substrate film

2. . . Adhesive layer

3. . . Inorganic sealing film

3a. . . Surface of inorganic sealing film

4. . . Release layer

10, 10a. . . Adhesive tape

20. . . Transfer member

twenty one. . . Next layer

Fig. 1 is a cross-sectional view showing an adhesive tape with a functional film according to an embodiment of the present invention.

Fig. 2(a) to (e) are schematic explanatory views showing a transfer method of a functional film in an adhesive tape with a functional film shown in Fig. 1.

1. . . Substrate film

2. . . Adhesive layer

3. . . Inorganic sealing film

4. . . Release layer

10. . . Adhesive tape

Claims (7)

An adhesive tape with a functional film, comprising: a base film; an adhesive layer laminated on one side of the base film; a functional film laminated on a surface of the adhesive layer; and a non-adhesive layer Interposed between the adhesive layer and the functional film, and partially exposing the surface of the adhesive layer; wherein the adhesive layer contains a pressure-sensitive adhesive and a side chain crystalline polymer, and At a temperature higher than the melting point of the side chain crystalline polymer, the force is lowered; the functional film is an inorganic sealing film, and the material constituting the inorganic sealing film is made of quartz glass, alkali glass, soda lime glass, lead glass, boron A glass selected from the group consisting of phthalic acid glass, aluminosilicate glass, and bismuth oxide glass; the non-adhesive layer is composed of a fluororesin and formed by vapor deposition. The adhesive film with a functional film according to the first aspect of the invention, wherein the side chain crystalline polymer is crystallized at a temperature not exceeding the melting point, and exhibits fluidity at a temperature equal to or higher than the melting point. The functional film-attached adhesive tape according to the first aspect of the invention, wherein the side chain crystalline polymer is obtained by using 20 to 100 parts by weight of a linear alkyl group having a carbon number of 16 or more. An acrylate, a polymer obtained by polymerizing 0 to 70 parts by weight of a (meth) acrylate having an alkyl group having 1 to 6 carbon atoms, and 0 to 10 parts by weight of a polar monomer. An adhesive tape with a functional film according to claim 1, wherein the non-adhesive layer has a thickness of 1 μm or less. An adhesive tape with a functional film as claimed in claim 1, wherein the functional film has a thickness of 0.01 to 100 μm. An adhesive tape with a functional film according to the first aspect of the invention, wherein a release layer is provided on a surface of the functional film. A method for transferring a functional film, which is a method for transferring a functional film in a functional film-attached adhesive tape of the first application of the patent application to a transfer member, comprising the steps of: transferring a layer via an adhesive layer a step of bringing the member to the surface of the functional film; and then, setting the temperature of the adhesive layer to a temperature higher than a melting point of the side chain crystalline polymer to lower the adhesive force, and applying a functional film from the adhesive layer The step of transferring the functional film from the adhesive layer to the transfer member is taken out.