KR20200046644A - Adhesive composition, adhesive film comprising same, backplate film comprising adhesive film and plastic organic light emitting display comprising backplate film - Google Patents

Abstract

The present application relates to a pressure-sensitive adhesive composition, a pressure-sensitive adhesive film containing the same, a backplate film containing the pressure-sensitive adhesive film, and a plastic organic light emitting display comprising the backplate film.

Description

Adhesive composition, adhesive film containing the same, back plate film containing the adhesive film and plastic organic light emitting display including the back plate film {ADHESIVE COMPOSITION, ADHESIVE FILM COMPRISING SAME, BACKPLATE FILM COMPRISING ADHESIVE FILM AND PLASTIC ORGANIC LIGHT EMITTING DISPLAY COMPRISING BACKPLATE FILM}

The present specification relates to a pressure-sensitive adhesive composition, an adhesive film comprising the same, a backplate film containing the adhesive film, and a plastic organic light emitting display including the backplate film.

Plastic organic light-emitting display has the advantage of using a plastic substrate instead of a glass substrate that does not bend well in a conventional organic light-emitting display, it is very flexible, not easily broken, and has excellent durability. Therefore, recently, as the shape of the display has been diversified, research into plastic organic light emitting displays has been actively conducted.

In such a plastic organic light emitting display, a back plate film is attached to the back of the panel to protect a thin organic light emitting device and to support a thin film encapsulation (TFE) layer. At this time, the back plate film should have strong adhesiveness as an adhesive film. In particular, the plastic organic light emitting display panel goes beyond a simple curved form, can be bent (Bendable), folded (Folderable) or rolled (Rollable), etc. As form evolves, high flexibility is required.

Therefore, there is a need to develop an adhesive film for a backplate film of a plastic organic light emitting display having excellent flexibility and high adhesion.

Japanese Patent Publication No. 2011-202161

Accordingly, the present specification includes a pressure-sensitive adhesive composition having high flexibility and high adhesion, an adhesive film comprising the same, a backplate film containing the adhesive film, and an adhesive composition for a backplate film of a plastic organic light emitting display comprising the adhesive film and the same It is intended to provide an adhesive film.

In one embodiment of the present specification, the glass transition temperature (Glass Transition Temperature, T _g ) includes at least two types of monomers (A) having a temperature of -95 ° C or higher and -30 ° C or lower, and the content of the monomer (A) is 100 of total monomers. An adhesive composition having 93 parts by weight or more based on parts by weight is provided.

Another exemplary embodiment of the present specification, the base film; And it provides an adhesive film comprising an adhesive layer comprising the above-described pressure-sensitive adhesive composition or a cured product provided on one surface of the base film.

Another exemplary embodiment of the present specification provides a back plate film including the above-described adhesive film.

Finally, an exemplary embodiment of the present specification, the back plate film described above; A plastic substrate provided on the adhesive film side of the back plate film; And it provides a plastic organic light-emitting display including an organic light-emitting device provided on the opposite surface of the plastic substrate in contact with the adhesive film.

The pressure-sensitive adhesive film comprising the pressure-sensitive adhesive composition according to one embodiment of the present specification improves flexibility due to low glass transition temperature, and has high adhesion, so that it can be attached to various types of panels. In particular, it is advantageous for flexible displays that can be bent or folded.

1 is a view showing an exemplary laminated structure of a back plate film according to an exemplary embodiment of the present specification.
2 is a view showing an exemplary laminated structure of a plastic organic light emitting display according to an exemplary embodiment of the present specification.

Hereinafter, the present specification will be described in more detail.

One embodiment of the present specification relates to an adhesive composition, and includes two or more types of monomers (A) having a glass transition temperature (T _g ) of -95 ° C or higher and -30 ° C or lower, and the monomer (A) Characterized in that the content of 93 parts by weight or more based on 100 parts by weight of the total monomer.

The pressure-sensitive adhesive composition has a low glass transition temperature by including the monomer (A) as described above, and provides flexibility and adhesion required for a back plate film of a plastic organic light emitting display. In particular, it is possible to provide excellent flexibility and high adhesion required for flexible displays.

When the glass transition temperature of the monomer (A) is less than -95 ° C, it is difficult to manufacture in a semi-cured state, and thus it is difficult to produce a film form, and when it exceeds -30 ° C, the hardness of the pressure-sensitive adhesive composition increases to decrease flexibility. There is.

In the present specification, when a part “includes” a certain component, it means that the component may further include other components, not exclude other components, unless otherwise stated.

In the present specification, "normal temperature" is a temperature selected from 20 ° C to 26 ° C, for example 23 ° C.

In the present specification, the glass transition temperature means a temperature at which a polymer material is converted from a hard solid state such as glass to an elastic rubber state. The glass transition temperature is determined according to the structural properties of the monomer, and thus the polymer has an inherent glass transition temperature depending on the type of the polymerized monomer. The lower the glass transition temperature, the higher the flexibility of the material, and the higher the glass transition temperature, the stronger the material. Since the monomer itself cannot measure the glass transition temperature, it is generally measured by polymerizing a homopolymer of the monomer.

According to an exemplary embodiment of the present specification, the monomer (A) is a (meth) acrylate-based monomer.

In the present specification, (meth) acrylate is meant to include both acrylate and methacrylate.

In one embodiment of the present specification, examples of the monomer (A) are described below, but are not limited thereto.

According to one embodiment of the present specification, the monomer (A) is n-butyl acrylate (T _g : -54 ° C), isodecyl acrylate (T _g : -55 ° C), isooctyl acrylate (T _g : -70 ℃), n-dodecyl (meth) acrylate (T _g : -55 ℃), 2-ethylhexyl acrylate (T _g : -50 ℃), 2-propylheptyl acrylate (T _g : -68 ℃), 2-methoxyethyl acrylate (T _g : -50 ° C), 2- (2-ethoxyethoxy) ethyl acrylate (T _g : -70 ° C), heptadecyl acrylate (T _g :- 64 ℃), lauryl (meth) acrylate (T _g : -50 ℃), stearyl polyethylene glycol (meth) acrylate (T _g : -58 ℃) or ethyl diglycol acrylate (T _g : -53 ℃) )to be.

According to an exemplary embodiment of the present specification, the pressure-sensitive adhesive composition includes two or more of the monomer (A). The monomer (A) may be divided into a main monomer and a comonomer based on the content. A monomer (A) having a content equal to or larger than the main monomer is a main monomer, and a monomer (A) having a content equal to or smaller than the content is a comonomer. The content ratio of the main monomer and the comonomer can be expressed as 1: 1, 2: 1 or 3: 1.

The content of the main monomer is 49 parts by weight or more based on 100 parts by weight of the total monomer, and the content of the comonomer is 49 parts by weight or less based on 100 parts by weight of the total monomer.

Specifically, the content of the main monomer is 49 parts by weight or more and 97 parts by weight or less based on 100 parts by weight of the total monomer, preferably 55 parts by weight or more and 85 parts by weight or less, more preferably 65 parts by weight or more and 85 parts by weight or less , More preferably, it may be 65 parts by weight or more and 75 parts by weight or less.

The content of the comonomer is 1 part by weight or more and 49 parts by weight or less based on 100 parts by weight of the total monomer, preferably 10 parts by weight or more and 40 parts by weight or less, more preferably 10 parts by weight or more and 30 parts by weight or less, and more preferably It may be 20 parts by weight or more and 30 parts by weight or less.

The comonomer generally has a glass transition temperature lower than that of the main monomer, thereby lowering the glass transition temperature of the pressure-sensitive adhesive composition and improving adhesion.

In one embodiment of the present specification, the glass transition temperature of the main monomer is -60 ° C or higher and -30 ° C or lower, preferably -55 ° C or higher and -40 ° C or lower.

The glass transition temperature of the comonomer is -95 ° C or more and less than -60 ° C, and may preferably be -85 ° C or more and -65 ° C or less.

According to an exemplary embodiment of the present specification, the pressure-sensitive adhesive composition comprises at least 93 parts by weight based on 100 parts by weight of the total monomer (A), preferably at least 93 parts by weight and less than 98 parts by weight, more preferably 94 It may be greater than or equal to 98 parts by weight.

According to an exemplary embodiment of the present specification, the pressure-sensitive adhesive composition further comprises a functional monomer. The functional monomer is a monomer containing a crosslinkable functional group, and serves to crosslink between chains, and is mainly combined with an epoxy or isocyanate composition. The type of the functional monomer is not particularly limited, but may include, for example, one of hydroxy group-containing monomer and carboxyl group-containing monomer.

Examples of the hydroxy group-containing monomer, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylic Rate, 8-hydroxyoctyl (meth) acrylate, 2-hydroxyethylene glycol (meth) acrylate, or 2-hydroxypropylene glycol (meth) acrylate.

Examples of the carboxyl group-containing monomers include (meth) acrylic acid, 2- (meth) acryloyloxyacetic acid, 3- (meth) acryloyloxypropyl acid, 4- (meth) acryloyloxybutyl acid, acrylic acid double Sieve, itaconic acid, maleic acid, or maleic anhydride.

In one embodiment of the present specification, the functional monomer is 2 parts by weight to 7 parts by weight based on 100 parts by weight of the total monomer, and specifically 4 parts by weight to 6 parts by weight.

According to an exemplary embodiment of the present specification, the functional monomer includes a hydroxyl group.

In one embodiment of the present specification, the pressure-sensitive adhesive composition includes an additive for increasing adhesion. The additive for increasing the adhesive strength is added after polymerizing the monomers included in the adhesive composition with each other and polymerizing the monomers to improve the adhesive level. When the additive for increasing the adhesive strength is post-added, the additive having a low molecular weight exists in a floating form on the crosslinked acrylate coating film, so that it can be directly bonded to the adherend. When the additive for increasing the adhesive strength is polymerized together with the monomers, the effect of improving the adhesive strength is halved because it does not float to the surface.

The type of the additive for increasing adhesion is not limited, and for example, a silane coupling agent or a terpene-based material may be used. The content of the additive for increasing the adhesive strength is 0.5 parts by weight to 2.0 parts by weight based on 100 parts by weight of the adhesive composition, and preferably 1 part by weight to 2 parts by weight.

According to an exemplary embodiment of the present specification, the additive for increasing the adhesion is a silane coupling agent. The silane coupling agent is not particularly limited, but preferably contains an epoxy, for example, 3-glycidoxypropyl trimethoxysilane, 3-glycidoxypropyl methyl diethoxysilane, 3-glycidoxypropyl trie Methoxysilane and 2- (3,4-epoxycyclohexyl) -ethyltrimethoxysilane.

In one embodiment of the present specification, the pressure-sensitive adhesive composition includes a curing agent. The curing agent may include one or more selected from the group consisting of an isocyanate-based curing agent and an epoxy-based curing agent.

Examples of the curing agent include toluene diisocyanate, 4,4'-methylene dicyclohexyl diisocyanate, isophorone diisocyanate, methylene diphenyl diisocyanate, xylene diisocyanate, and the like.

The content of the curing agent is 0 parts by weight or more and 50 parts by weight or less, preferably 0.001 parts by weight or more and 30 parts by weight or less, and more preferably 0.001 parts by weight or more and 10 parts by weight or less based on 100 parts by weight of the solid content of the pressure-sensitive adhesive composition.

In one embodiment of the present specification, the pressure-sensitive adhesive composition may further include a solvent.

The solvent may be a ketone solvent such as acetone and methyl ethyl ketone (MEK) or an aromatic solvent such as toluene, but is not limited thereto, and a general organic solvent may be used.

The content of the solvent is 30 parts by weight or more and 99 parts by weight or less based on 100 parts by weight of the pressure-sensitive adhesive composition, preferably 40 parts by weight or more and 90 parts by weight or less, and more preferably 50 parts by weight or more and 90 parts by weight or less.

According to an exemplary embodiment of the present specification, the glass transition temperature of the pressure-sensitive adhesive composition is -30 ℃ or more -10 ℃ or less. Specifically, the glass transition temperature of the pressure-sensitive adhesive composition is -30 ℃ or more -10 ℃ or less, preferably -30 ℃ or more -20 ℃ or less. The pressure-sensitive adhesive composition having a low glass transition temperature is excellent in flexibility and adhesive strength is increased.

The glass transition temperature of the pressure-sensitive adhesive composition was measured using ARES-G2 equipment by stacking the pressure-sensitive adhesive composition in the form of a layer having a thickness of 300 μm to 700 μm.

The room temperature adhesion and permanent adhesion were measured using a texture analyzer at a 180 ° angle and a peel rate of 300 mm / min based on ASTM D3330 and D903.

According to an exemplary embodiment of the present specification, the pressure-sensitive adhesive composition is provided for the adhesive film of the back plate film of the plastic organic light emitting display.

In one embodiment of the present specification, the base film; And it provides an adhesive film comprising an adhesive layer comprising the pressure-sensitive adhesive composition or a cured product provided on one surface of the base film. The base film is polyethylene terephthalate (polyethylene terephthalate, PET), polyester (polyester), polycarbonate (Polycarbonate, PC), polyimide (polyimide, PI), polyethylene naphthalate (polyethylene naphthalate, PEN), polyether ether ketone (polyether ether ketone, PEEK), polyarylate (PAR), polycyclic olefin (PCO), polynorbornene, polyethersulphone (PES) and cycloolefin polymer (COP) ).

According to an exemplary embodiment of the present specification, the base film may be polyethylene terephthalate (PET).

In one embodiment of the present specification, the thickness of the base film is 50 μm or more and 100 μm or less, and preferably 60 μm or more and 80 μm or less.

Moreover, it is preferable that the said base film is transparent. The meaning that the base film is transparent here means that the light transmittance of visible light (400 to 700 nm) is 80% or more.

When the base film has the above range, the laminated adhesive film has properties capable of thinning.

In one embodiment of the present specification, the thickness of the adhesive layer may be 10 μm or more and 20 μm or less, preferably 10 μm or more and 15 μm or less.

When the thickness of the adhesive layer has the above range, the rework property is excellent in the case of misadherence, and in particular, it has a property that no foreign matter remains when removing the adhesive sheet.

In one embodiment of the present specification, the adhesive film has a thickness of 60 μm or more and 120 μm or less.

In another exemplary embodiment, the thickness of the adhesive film is 60 μm or more and 120 μm or less, and preferably 60 μm or more and 90 μm or less.

Since the adhesive film has the above range, the thickness as a back plate is suitable when applied to a plastic organic light emitting display in the future, and also has excellent rework properties when attached incorrectly, especially when removing an adhesive sheet. It has a characteristic that does not remain.

The method of applying the adhesive composition on the base film includes a comma coater, a lip coater, a slot die coater, a comma reverse coater, a bar coater, and Gravure Coater (Gravure Coater) and the like, but is not limited thereto.

According to the exemplary embodiment of the present specification, the adhesive film having a normal temperature adhesive strength of 1000gf / inch or more and 2000gf / inch or less measured after lamination such that the adhesive layer of the adhesive film is in contact with one surface of the polyimide (PI) film and allowed to stand for 3 hours. Gives

According to another exemplary embodiment of the present specification, the adhesive layer of the adhesive film is laminated on one surface of a polyimide (PI) film, and the autoclave is maintained at a temperature of 50 ° C. and a pressure of 0.5 MPa for 20 minutes. After that, the adhesive film having a permanent adhesive force of 1100 gf / inch or more and 2100 gf / inch or less after measuring at room temperature for 1 hour is provided.

According to another exemplary embodiment of the present specification, the adhesive layer of the pressure-sensitive adhesive film is laminated on one surface of the glass to provide a pressure-sensitive adhesive film having an adhesive strength of 900 gf / inch or more and 1800 gf / inch or less measured after standing for 3 hours. .

According to another exemplary embodiment of the present specification, lamination is performed so that the adhesive layer of the adhesive film is contacted to one surface of the glass, and maintained for 20 minutes at a temperature of 50 ° C. and a pressure of 0.5 MPa in an autoclave for 1 hour. It provides an adhesive film having a permanent adhesive strength of 900 gf / inch or more and 1900 gf / inch or less measured after standing at room temperature for a while.

The room temperature adhesion and permanent adhesion were measured using a texture analyzer at a 180 ° angle and a peel rate of 300 mm / min based on ASTM D3330 and D903.

In the process of measuring the adhesive force, the autoclave may be further performed to ensure good adhesion. The conditions of the autoclave are 30 ° C to 60 ° C, the pressure is 0.1 MPa to 1.0 MPa, and the time is 1 minute to 30 minutes. After performing the autoclave, the adhesive strength is measured after standing at room temperature for 30 minutes to 1 hour.

According to one embodiment of the present specification, the adhesive film is used for a backplate film of a plastic organic light emitting display.

In one embodiment of the present specification, there is provided an adhesive film further comprising a release film provided on a surface opposite to a surface of the adhesive layer on which the base film is in contact.

The release film may be a hydrophobic film may be used, as a layer for protecting a very thin adhesive layer, refers to a transparent layer attached to one side of the adhesive sheet, a film excellent in mechanical strength, thermal stability, moisture shielding property, isotropy, etc. Can be used. For example, acetate type, polyester type, polyether sulfone type, polycarbonate type, polyamide type, polyimide type, polyolefin type, cycloolefin type, polyurethane type and acrylic type resin film such as triacetyl cellulose (TAC), etc. It can be used, but if the commercially available silicone-treated release film is not limited to this.

In one embodiment of the present specification, a back plate film including the adhesive film is provided. The back plate film may constitute the adhesive film alone, or an additional film may be further included. The additional film is not particularly limited, but may be, for example, a protective film. The protective film serves to protect the adhesive film to prevent foreign matter or scratches from occurring during the transfer or process of the back plate film.

The lamination structure of the back plate film 103 can be confirmed in FIG. 1, and may be provided by additionally laminating the protective film 101 as shown in FIG. 1.

According to an exemplary embodiment of the present specification, the base film; And a pressure-sensitive adhesive layer provided on one surface of the base film, and the pressure-sensitive adhesive layer measured after laminating the pressure-sensitive adhesive layer on a polyimide (PI) film and standing for 3 hours is 1000 gf / inch or more and 2000 gf / inch or less. Gives

According to another exemplary embodiment of the present specification, the base film; And an adhesive layer provided on one surface of the base film, and the adhesive layer is laminated to a polyimide (PI) film and maintained for 20 minutes at a temperature of 50 ° C. and a pressure of 0.5 MPa in an autoclave, Provided is a back plate film having a permanent adhesive strength of 1100 gf / inch or more and 2100 gf / inch or less measured after standing at room temperature for 1 hour.

According to another exemplary embodiment of the present specification, the base film; And an adhesive layer provided on one surface of the base film, the adhesive layer is laminated to a polyimide (PI) film, and the adhesive strength at room temperature measured after standing for 3 hours is 1000 gf / inch or more and 2000 gf / inch or less. The adhesive layer was laminated to a polyimide (PI) film, and maintained at a temperature of 50 ° C. and a pressure of 0.5 MPa in an autoclave for 20 minutes, and then, after standing at room temperature for 1 hour, the permanent adhesive force measured was 1100 gf / inch. It provides a back plate film of more than 2100gf / inch.

According to another exemplary embodiment of the present specification, the base film; And a pressure-sensitive adhesive layer provided on one surface of the base film, laminating the pressure-sensitive adhesive layer on glass, and providing a backplate film having a room temperature adhesion of 900 gf / inch or more and 1800 gf / inch or less measured after standing for 3 hours.

According to another exemplary embodiment of the present specification, the base film; And a pressure-sensitive adhesive layer provided on one surface of the base film, laminating the pressure-sensitive adhesive layer to glass, maintaining the temperature at 50 ° C. and a pressure of 0.5 MPa in an autoclave for 20 minutes, and then at room temperature for 1 hour. Provided is a back plate film having a permanent adhesive strength of 900 gf / inch or more and 1900 gf / inch or less measured after standing.

The room temperature adhesion and permanent adhesion were measured using a texture analyzer at a 180 ° angle and a peel rate of 300 mm / min based on ASTM D3330 and D903.

According to another exemplary embodiment of the present specification, a back plate film according to the present specification; A plastic substrate provided on the adhesive film side of the back plate film; And it provides a plastic organic light-emitting display including an organic light-emitting device provided on the opposite surface of the plastic substrate in contact with the adhesive film.

For example, the laminated structure of the plastic organic light emitting display 106 can be seen in FIG. 2. Specifically, the back plate film 103; Plastic substrate 104; And an organic light emitting element 105 sequentially stacked.

The stacked structure of the plastic organic light emitting display is not limited thereto, and may be provided as a stacked structure known in the art.

The pressure-sensitive adhesive composition will be described in detail in the Examples below. However, the following examples are intended to illustrate the present specification, and the scope of the present specification is not limited by them.

<Production Example> Preparation of adhesive composition

An adhesive composition having the composition of Table 1 below was prepared. First, one or more monomers (A) and functional monomers were polymerized together with a curing agent (xylene diisocyanate), and then an additive for increasing adhesion (3-glycidoxypropyl trimethoxysilane) was added.

The content ratio of the monomer (A) and the functional monomer is based on 100 parts by weight of the total monomer, and the content of the additive for increasing adhesion is based on 100 parts by weight of the adhesive composition.

In Table 1, EHA (ethylhexyl acrylate) was used as a product of NIPPON Shoukubai as a main monomer having a glass transition temperature of -50 ° C.

In Table 1, IOA (isooctyl acrylate) was a product of NIPPON Shoukubai as a comonomer having a glass transition temperature of -70 ° C.

In Table 1, HEA (2-hydroxyethyl (meth) acrylate) was used as a functional monomer of NIPPON Shoukubai.

<Experimental Example>

After applying the adhesive composition of 10% to 50% (for example, 15%) of the solid content of Examples 1 to 10 prepared in the above Production Example on a base film (PET), and then dried at 80 ° C to 140 ° C using a dry oven To prepare a back plate film.

The adhesive strength at room temperature was measured by laminating the prepared back plate film on the adherend and leaving it for 3 hours, and the permanent adhesive strength was applied to the adherend and after being laminated on the adherend, the autoclave was subjected to a temperature of 50 ° C and a pressure of 0.5 MPa for 20 minutes. After holding, the adhesive force was measured after standing at room temperature for 1 hour. Table 2 below shows the measurement results.

From the above results, it can be seen that the adhesive strength of the pressure-sensitive adhesive film containing the pressure-sensitive adhesive composition composed of two or more monomers (A) is higher than the comparative example consisting of only one type of monomer (A). In addition, a higher adhesive strength was measured when the PI film was used than when the glass was used as the adherend, and the adhesive strength of the examples in which the silane coupling agent was added as an additive for increasing the adhesive strength was measured higher.

Accordingly, the adhesive strength of the pressure-sensitive adhesive composition containing two or more monomers (A) having a glass transition temperature of -95 ° C to -30 ° C is 93 parts by weight or more based on 100 parts by weight of the total monomer (A) is excellent. Could confirm.

101: protective film
102: adhesive film
103: back plate film
104: plastic substrate
105: organic light emitting device
106: plastic organic light emitting display

Claims (20)

Glass transition temperature (Glass Transition Temperature, T _g ) -95 ℃ or more and contains at least two monomers (A) -30 ℃ or less,
The pressure-sensitive adhesive composition that the content of the monomer (A) is 93 parts by weight or more based on 100 parts by weight of the total monomer. The method according to claim 1,
The monomer (A) is a (meth) acrylate-based pressure-sensitive adhesive composition. The method according to claim 1,
The monomer (A) is the main monomer of 49 parts by weight or more and 97 parts by weight or less based on 100 parts by weight of the total monomers; And
An adhesive composition comprising 1 part by weight to 49 parts by weight of comonomer based on 100 parts by weight of the total monomer. The method according to claim 3,
The glass transition temperature of the main monomer is -60 ℃ or more -30 ℃ or less,
The adhesive composition of the comonomer having a glass transition temperature of -95 ° C or higher and less than -60 ° C. The method according to claim 1,
The pressure-sensitive adhesive composition further comprises a functional monomer comprising a hydroxy group or a carboxyl group. The method according to claim 1,
The pressure-sensitive adhesive composition is a pressure-sensitive adhesive composition further comprises an additive for increasing the adhesion. The method according to claim 6,
The adhesive strength increasing additive is a silane coupling agent adhesive composition. The method according to claim 1,
The glass transition temperature of the pressure-sensitive adhesive composition is -30 ℃ or more -10 ℃ or less pressure-sensitive adhesive composition. The method according to claim 1,
The pressure-sensitive adhesive composition is for the pressure-sensitive adhesive film of the back plate film of a plastic organic light emitting display. Base film; And
An adhesive layer comprising the adhesive composition according to any one of claims 1 to 9 provided on one surface of the base film or a cured product thereof;
Adhesive film comprising a. The method according to claim 10,
The adhesive film has a thickness of 60 μm or more and 120 μm or less. The method according to claim 10,
An adhesive film having a normal temperature adhesive force of 1000 gf / inch or more and 2000 gf / inch or less measured after lamination such that the adhesive layer of the adhesive film is in contact with one surface of the polyimide (PI) film and allowed to stand for 3 hours. The method according to claim 10,
After lamination such that the adhesive layer of the adhesive film is in contact with one surface of the polyimide (PI) film, and maintained for 20 minutes at a temperature of 50 ° C. and a pressure of 0.5 MPa in an autoclave, and then left at room temperature for 1 hour. An adhesive film having a measured permanent adhesive strength of 1100 gf / inch or more and 2100 gf / inch or less. The method according to claim 10,
The adhesive film is for a back plate film of a plastic organic light emitting display. The method according to claim 10,
The adhesive film further comprises a release film provided on the opposite surface of the contact surface of the base film of the adhesive layer. Back plate film comprising the adhesive film according to claim 10. Base film; And
It includes an adhesive layer provided on one surface of the base film,
The adhesive layer was laminated on one surface of a polyimide (PI) film, and after standing for 3 hours, the room temperature adhesive strength measured was 1000 gf / inch or more and 2000 gf / inch or less. Base film; And
It includes an adhesive layer provided on one surface of the base film,
The adhesive layer was laminated on one surface of a polyimide (PI) film, and maintained at a temperature of 50 ° C. and a pressure of 0.5 MPa for 20 minutes in an autoclave, and then left at room temperature for 1 hour to measure the permanent adhesive strength. 1100gf / inch or more and 2100gf / inch or less. The method according to claim 18,
The adhesive layer was laminated on one surface of a polyimide (PI) film, and after standing for 3 hours, the room temperature adhesive strength measured was 1000 gf / inch or more and 2000 gf / inch or less. A back plate film according to claim 16;
A plastic substrate provided on the adhesive film side of the back plate film; And
An organic light emitting device provided on a surface opposite to the surface of the plastic substrate in contact with the adhesive film;
Plastic organic light emitting display comprising a.

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