KR20210148566A - encapsulation member for rollable organic electronic device and organic electronic device comprising the same - Google Patents

Abstract

The present invention relates to a sealing material for a rollable organic electronic device, and a rollable organic electronic device comprising the same, and more particularly, to a sealing material for a rollable organic electrode device which removes and blocks access of defect causing materials such as moisture and impurities to an organic electronic device, prevents an interlayer delamination phenomenon which may occur when moisture is removed, has an effect of having excellent moisture resistance and heat resistance, and has low change rates of peel strength and elastic modulus according to temperature change, and a rollable organic electronic device comprising the same. The sealing material comprises a sealing resin layer which is formed by comprising a sealing resin with an epoxy resin, and a moisture absorbing agent.

Description

Encapsulation member for rollable organic electronic device and organic electronic device comprising the same

The present invention relates to an encapsulant for a rollable organic electronic device and a rollable organic electronic device including the same, and more particularly, to an organic electronic device that is removed and blocked so that materials that cause defects such as moisture and impurities do not access, and moisture An encapsulant for a rollable organic electronic device, which has excellent moisture resistance and heat resistance, and has a low rate of change of peel strength and elastic modulus according to temperature change, and a rollable product containing the same It relates to organic electronic devices.

An organic light emitting diode (OLED) is a light emitting diode in which a light emitting layer is made of a thin organic compound, and uses an electroluminescence phenomenon in which a current is passed through a fluorescent organic compound to generate light. These organic light emitting diodes generally implement main colors in three colors (Red, Green, Blue) independent pixel method, bioconversion method (CCM), curly filter method, etc. Accordingly, it is divided into a low molecular organic light emitting diode and a polymer organic light emitting diode. In addition, according to the driving method, it may be divided into a passive driving method and an active driving method.

These organic light emitting diodes have characteristics such as high efficiency by self-emission, low voltage driving, and simple driving, and thus have the advantage of being able to express high-definition video. In addition, applications to flexible displays and organic electronic devices using the flexible characteristics of organic materials are also expected.

The organic light emitting diode is manufactured in the form of laminating an organic compound, which is a light emitting layer, in the form of a thin film on a substrate. However, organic compounds used in organic light emitting diodes are very sensitive to impurities, oxygen and moisture, and thus have a problem in that their properties are easily deteriorated by external exposure or penetration of moisture and oxygen. This deterioration of the organic material affects the light emitting characteristics of the organic light emitting diode and shortens the lifespan. In order to prevent this phenomenon, a thin film encapsulation process is required to prevent oxygen, moisture, etc. from flowing into the inside of the organic electronic device.

Conventionally, a metal can or glass is processed into a cap shape to have a groove, and a desiccant for moisture absorption is loaded in the groove in a powder form. It blocks organic electronic devices from accessing materials that cause defects, such as moisture and impurities, does not cause delamination that can occur when moisture is removed, and it is difficult to have excellent effects in moisture resistance and heat resistance at the same time.

On the other hand, in organic electronic devices such as organic light emitting diodes, flexible organic electronic devices manufactured to maintain expressive performance even when bent like paper using flexible materials according to market demands are rapidly emerging as next-generation organic electronic devices. . The flexible organic electronic device includes a curved organic electronic device that is fixed in a state of having a specific curvature, a foldable organic electronic device that can be bent beyond a specific curvature radius or can be bent based on a folding axis, and a rollable organic electronic device that can be rolled with a specific curvature radius includes Among them, the rollable organic electronic device has the advantage of having excellent portability compared to the display area, and thus many studies are being conducted.

As mentioned above, flexible organic electronic devices have a specific curvature to realize the bending performance, and thus, unlike general rigid organic electronic devices, stability against bending stress is required, and furthermore, high resistance to external environmental changes is required. Stability is required. In particular, the rollable organic electronic device has a difficult problem even though it should have higher stability because the entire area is rolled to a specific radius of curvature.

Korean Patent Publication No. 10-2019-0093833 (published on August 12, 2019)

The present invention has been devised to solve the above problems, and the problem to be solved by the present invention is to remove and block materials that cause defects such as moisture and impurities from accessing the organic electronic device, and may occur when the moisture is removed. An encapsulant for rollable organic electronic devices that does not cause delamination, has excellent moisture resistance and heat resistance, has a low rate of change of peel strength and elastic modulus according to environmental changes such as temperature, and has high stability against bending stress And to provide a rollable organic electronic device including the same.

In order to solve the above problems, the present invention provides an encapsulant layer formed including an encapsulant resin containing an epoxy resin and a moisture absorbent; including,

The encapsulation layer may include a first encapsulation layer; and a second encapsulating resin layer formed on one surface of the first encapsulating resin layer.

The encapsulation resin of the first encapsulation resin layer further comprises a polymer resin having a weight average molecular weight of 10,000 to 300,000 g/mol,

The encapsulation resin of the second encapsulation resin layer further comprises a thermoplastic elastomer having a storage modulus of 0.01 to 1.0 MPa and a loss modulus of 0.005 to 0.1 MPa measured by the following measuring method 1,

The encapsulant layer provides an encapsulant for a rollable organic electronic device, characterized in that it satisfies the following relation (1).

[Relational Expression 1]

1.0 ≤ A/B ≤ 15.0

In Relation 1, A is the peel strength (gf/10mm) of the cured encapsulant layer measured using UTM equipment at a temperature of 25°C, and B is measured using UTM equipment at a temperature of 60°C. Peel strength (gf/10mm) of one cured encapsulant layer.

[Measurement method 1]

After the thermoplastic elastomer cured to a thickness of 800 μm was punched to have a circular diameter of 6 mm, a temperature range of 10 to 110° C., a temperature increase rate of 5° C./min, a frequency of 15 rad/s, and an axial force of 0.1 N ( The storage modulus and loss modulus at 25° C. were measured under the axial force) condition, respectively.

In a preferred embodiment of the present invention, A may be 700 gf/10mm or more, and B may be 500 gf/10mm or more.

In a preferred embodiment of the present invention, A may be 1400-2600 gf/10mm, and B may be 1260-2340 gf/10mm.

In a preferred embodiment of the present invention, the polymer resin having a weight average molecular weight of 10,000 to 300,000 g/mol may include at least one selected from a phenoxy resin, an acrylic resin, a nitrile-based rubber resin, and a urethane resin. can

In a preferred embodiment of the present invention, the polymer resin having a weight average molecular weight of 10,000 to 300,000 g/mol may include a compound represented by the following formula (1).

[Formula 1]

In Formula 1, n is an integer of 12 to 330.

In a preferred embodiment of the present invention,

The thermoplastic elastomer may include at least one selected from an isobutylene-based thermoplastic elastomer, an isoprene-based thermoplastic elastomer, a urethane-based thermoplastic elastomer, a styrene-based thermoplastic elastomer, a butadiene-based thermoplastic elastomer, and an ester-based thermoplastic elastomer.

In a preferred embodiment of the present invention, the thermoplastic elastomer may include a SIBS block copolymer (styrene-isobutylene-styrene block copolymer).

In a preferred embodiment of the present invention, the encapsulation resin of the second encapsulation resin layer may include the thermoplastic elastomer and the epoxy resin in a weight ratio of 1:0.7 to 1.3.

In a preferred embodiment of the present invention, the encapsulation resin of the first encapsulation resin layer may include the polymer resin and the epoxy resin having the weight average molecular weight of 10,000 to 300,000 g/mol in a weight ratio of 1:0.7 to 1.3.

In a preferred embodiment of the present invention, the epoxy resin includes a first epoxy resin and a second epoxy resin different from each other in a weight ratio of 1:0.7 to 2.5, and the first epoxy resin is a DCPD-type (dicyclopentadiene) solid epoxy resin. , bisphenol-A-type solid epoxy resin, bisphenol-F-type solid epoxy resin, and at least one selected from novolak-type solid epoxy resin, wherein the second epoxy resin is a silicone-modified liquid epoxy resin, a liquid bisphenol-type epoxy resin, It may include at least one selected from a liquid aminophenol-type epoxy resin and a naphthalene-type epoxy resin.

In a preferred embodiment of the present invention, the first encapsulating resin layer contains 2.0 to 4.0 parts by weight of a desiccant based on 100 parts by weight of the encapsulating resin, and the second encapsulating resin layer contains a desiccant based on 100 parts by weight of the encapsulating resin. 48 to 90 parts by weight may be included.

In a preferred embodiment of the present invention, the first encapsulating resin layer and the second encapsulating resin layer may each independently further include a curing agent.

In a preferred embodiment of the present invention, the curing agent is an amine-based curing agent including an aliphatic amine, an aromatic amine, a cycloaliphatic amine, a secondary amine, a tertiary or BF ₃ amine, an imidazole-based curing agent, an amide-based curing agent, and a sulfide It may include one or more selected from a curing agent-based curing agent, a phenol-based curing agent, a mercaptan-based curing agent, an isocyanate-based curing agent, and an acid anhydride-based curing agent.

In a preferred embodiment of the present invention, the first encapsulating resin layer contains 0.1 to 2.0 parts by weight of a curing agent based on 100 parts by weight of the encapsulating resin, and the second encapsulating resin layer includes a curing agent based on 100 parts by weight of the encapsulating resin. It may contain 2.5 to 9.0 parts by weight.

In a preferred embodiment of the present invention, the first encapsulation resin layer and the second encapsulation resin layer may have a thickness ratio of 1:1.0 to 8.0.

In a preferred embodiment of the present invention, the first encapsulant layer may have a thickness of 1 to 25 μm, and the second encapsulant layer may have a thickness of 25 to 60 μm.

In addition, the present invention is a substrate; a rollable organic electronic device formed on at least one surface of the substrate; and an encapsulant for a rollable organic electronic device of any one of claims 1 to 13 for packaging the rollable organic electronic device.

Hereinafter, the terms used in the present invention will be described.

The term "hygroscopic agent" used in the present invention can adsorb moisture by physical or chemical bonding such as van der Waals force with the interface of the moisture absorbent, and moisture-absorbing material and chemical Includes all water-absorbing materials that absorb water through a reaction and change into a new material

In addition, the term room temperature used in the present invention refers to a temperature of 10 to 40 ℃, preferably 15 to 35 ℃, preferably 18 to 30 ℃.

The rollable organic electronic device encapsulant of the present invention and the rollable organic electronic device including the same block oxygen, impurities, and moisture, and at the same time effectively remove moisture permeable to significantly prevent moisture from reaching the organic electronic device. This can significantly improve the lifespan and durability of the organic electronic device. In addition, the delamination phenomenon that may occur when moisture is removed does not occur, and at the same time, there is an effect of excellent moisture resistance and heat resistance. In addition to this, the rate of change of peel strength and elastic modulus according to temperature change is low.

1 is a cross-sectional view of an encapsulant for a rollable organic electronic device according to a preferred embodiment of the present invention.
2 is a cross-sectional view of a rollable organic electronic device according to a preferred embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and the same reference numerals are added to the same or similar elements throughout the specification.

Referring to FIG. 1 , the encapsulant for a rollable organic electronic device of the present invention includes an encapsulant layer 10 .

The encapsulant layer 10 of the present invention may include an encapsulant resin containing an epoxy resin, and may further include moisture absorbents 40' and 40".

Specifically, the encapsulation layer 10 of the present invention includes a first encapsulant layer 11 and a second encapsulant layer 12 formed on one surface of the first encapsulant layer 11 .

At this time, the encapsulant layer 10 of the present invention satisfies the following relational expression (1).

[Relational Expression 1]

1.0 ≤ A/B ≤ 15.0

In Relation 1, A is the peel strength (gf/10mm) of the cured encapsulant layer measured using UTM equipment at a temperature of 25°C, and B is measured using UTM equipment at a temperature of 60°C. Peel strength (gf/10mm) of the cured encapsulant layer.

In the above relation 1, A/B is preferably 1.0 ≤ A/B ≤ 10.0, more preferably 1.0 ≤ A/B ≤ 5.0, more preferably 1.0 ≤ A/B ≤ 2.5, still more preferably 1.05 ≤ A/B ≤ 1.25.

In Relation 1, if A/B is less than 1.0, there may be a problem of reliability degradation due to insufficient curing rate, and if it exceeds 15.0, there may be a problem in that the durability of the encapsulant is reduced due to the lack of deformation resistance due to temperature change. can

Further, in Relation 1, A is 700 gf/10mm or more, preferably 1400-2600 gf/10mm, more preferably 1600-2400 gf/10mm, still more preferably 1800-2200 gf/10mm, still more preferably may be 1900 to 2100 gf/10mm, and if A is less than 700 gf/10mm, there may be a problem in that moisture resistance and cementation quality are deteriorated.

Further, in Relation 1, B is 500 gf/10mm or more, preferably 1260-2340 gf/10mm, more preferably 1440-2160 gf/10mm, even more preferably 1620-1980 gf/10mm, even more preferably It may be 1710-1890 gf/10mm, and if B is less than 500 gf/10mm, there may be a problem of moisture resistance and durability degradation.

On the other hand, the encapsulant layer 10 of the present invention may further satisfy the following relational expression 2, and if the following relational expression 2 is not satisfied, moisture resistance and poor panel quality may result.

[Relational Expression 2]

C < D

In Relation 2, C is the content of the desiccant 40" included in the first sealing resin layer 11, and D is the content of the moisture absorbent 40' included in the second sealing resin layer 12.

In addition, the rollable organic electronic device encapsulant of the present invention may further include a release layer 30 formed on the other surface of the first encapsulating resin layer 11, and a metal layer formed on one surface of the second encapsulating resin layer 12 ( 20) may further include

First, the first encapsulating resin layer 11 is a layer in direct contact with the rollable organic electronic device (not shown), and may include an encapsulating resin and a desiccant 40 ″.

The encapsulation resin included in the first encapsulation resin layer 11 may include a pressure-sensitive adhesive composition including an epoxy resin, and preferably may further include a polymer resin having a weight average molecular weight of 10,000 to 300,000 g/mol.

At this time, the encapsulation resin included in the first encapsulation resin layer 11 contains a polymer resin and an epoxy resin in a weight ratio of 1:0.7 to 1.3, preferably 1:0.8 to 1.2 by weight, more preferably 1:0.9 to 1.1 by weight. , more preferably 1:0.95 to 1.05 weight ratio, if the weight ratio is less than 1:0.7, there may be a problem of lowering peel strength, and if it exceeds 1:1.3, there may be problems in moisture resistance and coating quality can

The polymer resin of the encapsulation resin included in the first encapsulation resin layer 11 of the present invention may preferably have a weight average molecular weight of 20,000 to 150,000 g/mol, more preferably 30,000 to 75,000 g/mol.

If the weight average molecular weight is less than 10,000 g/mol, there may be a problem in heat resistance, and if it exceeds 300,000 g/mol, peel strength and cohesion may deteriorate.

In addition, the polymer resin having a weight average molecular weight of 10,000 to 300,000 g/mol of the encapsulating resin included in the first encapsulating resin layer 11 of the present invention is a phenoxy resin, an acrylic resin, a nitrile-based rubber resin, and a urethane resin. It may include one or more selected from among, preferably, a phenoxy resin. Since the phenoxy resin has a functional group that reacts with the epoxy group, it has the advantage of realizing a high modulus of elasticity after curing of the encapsulant layer.

Preferably, the polymer resin may include a compound represented by the following formula (1).

[Formula 1]

In Formula 1, n is an integer of 12 to 330.

Preferably, n may be an integer of 24 to 165, more preferably 36 to 80.

The polymer resin having a weight average molecular weight of 10,000 to 300,000 g/mol may preferably have a glass transition temperature (Tg) of 84° C. or higher.

The epoxy resin of the encapsulation resin included in the first encapsulation resin layer 11 of the present invention may include a first epoxy resin and a second epoxy resin that are different from each other. At this time, the first epoxy resin and the second epoxy resin are 1:0.7 to 2.5 weight ratio, preferably 1:1.0 to 2.0 weight ratio, more preferably 1:1.2 to 1.8 weight ratio, still more preferably 1:1.35 to 1.65 It may be included in a weight ratio, and if the weight ratio is less than 1:0.7, there may be a problem in adhesion to the substrate of the encapsulant, and if it exceeds 1:2.5, there may be a problem in moisture resistance.

The first epoxy resin of the encapsulation resin included in the first encapsulation resin layer 11 of the present invention is a DCPD-type solid epoxy resin, a bisphenol-A-type solid epoxy resin, a bisphenol-F-type solid epoxy resin, and a novolac-type solid epoxy resin. It may include one or more selected from among, and preferably include a DCPD-type solid-state epoxy resin. When DCPD-type solid-state epoxy resin is used as the first epoxy resin, it has a low softening point, so it is possible to implement an encapsulant having excellent moisture resistance.

More preferably, the first epoxy resin may include a structure represented by the following formula (2).

[Formula 2]

Preferably, the first epoxy resin may have a softening point (s.p., softening point) of 80° C. or less. If the softening point is greater than this, there may be a problem in that cementation performance is deteriorated.

The second epoxy resin of the encapsulation resin included in the first encapsulation resin layer 11 of the present invention is at least one selected from a silicone-modified liquid epoxy resin, a liquid bisphenol-type epoxy resin, a urethane-modified liquid epoxy resin, and a rubber-modified liquid epoxy resin. It may include, and may preferably include a silicone-modified liquid epoxy resin, and more preferably a silicone-modified liquid epoxy resin having an anti-inflammatory content of 500 ppm or less in which a silicone intermediate including a phenyl group is substituted. When the silicone-modified liquid epoxy resin is included, superior peel strength can be realized compared to the case of using other epoxy resins.

More preferably, the second epoxy resin may include a structure represented by the following formula (3).

[Formula 3]

The desiccant 40" included in the first encapsulation resin layer 11 may be used without limitation as long as it is a desiccant typically used for packaging of rollable organic electronic devices, and preferably contains zeolite, titania, zirconia or montmorillonite as a component. It may include at least one of a desiccant, a metal salt, and a metal oxide, and more preferably a metal oxide.

Metal oxides are silica (SiO ₂ ), alumina (Al ₂ O ₃ ), lithium oxide (Li ₂ O), sodium oxide (Na ₂ O), barium oxide (BaO), calcium oxide (CaO) or magnesium oxide (MgO) It may include one or more of metal oxides, such as organic metal oxides, and phosphorus pentoxide (P ₂ O _{5 ).}

Metal salts are lithium sulfate (Li ₂ SO ₄ ), sodium sulfate (Na ₂ SO ₄ ), calcium sulfate (CaSO ₄ ), magnesium sulfate (MgSO ₄ ), cobalt sulfate (CoSO ₄ ), gallium sulfate (Ga ₂ (SO ₄ ) _{3 )} ), sulfates such as titanium sulfate (Ti(SO ₄ ) ₂ ) or nickel sulfate (NiSO ₄ ), calcium chloride (CaCl ₂ ), magnesium chloride (MgCl ₂ ), strontium chloride (SrCl ₂ ), yttrium chloride (YCl ₃ ), Copper chloride (CuCl ₂ ), cesium fluoride (CsF), tantalum fluoride (TaF ₅ ), niobium fluoride _{(NbF 5} ), lithium bromide (LiBr), calcium bromide (CaBr ₂ ), cesium bromide (CeBr ₃ ), selenium bromide ( Metal halides such as SeBr ₄ ), vanadium bromide (VBr ₃ ), magnesium bromide (MgBr ₂ ), barium iodide (BaI ₂ ) or magnesium iodide (MgI ₂ ), and barium perchlorate (Ba(ClO ₄ ) ₂ ) or magnesium perchlorate (Mg(ClO ₄ ) ₂ ) may include at least one of metal chlorates.

It is recommended to use a desiccant with a purity of 95% or more. If the purity is less than 95%, the moisture absorption function is lowered, and the material contained in the desiccant acts as an impurity, which can cause defects in the encapsulant, and rollable organic electronic devices. may also affect, but is not limited to.

In addition, the desiccant 40" included in the first encapsulation resin layer 11 may most preferably include silica (SiO ₂ ), which has excellent moisture removal performance, and encapsulation with rollable organic electronic devices. Separation of the ash can be prevented, and the durability of the rollable organic electronic device can be significantly increased. In addition, the moisture absorbent 40" included in the first encapsulating resin layer 11 is not limited in shape or particle size, but is preferably Preferably, the shape may be amorphous or spherical, and the average particle diameter may be 0.01 to 10 μm, preferably 0.1 to 5 μm, more preferably 0.2 to 1 μm, and if the average particle diameter is less than 0.01 μm, the specific surface area increases Therefore, there is a problem that the peel strength with the adherend can be reduced, and when it exceeds 10 μm, direct physical damage to the organic electronic device can occur.

On the other hand, the first sealing resin layer 11 of the present invention, based on 100 parts by weight of the sealing resin, 2.0 to 4.0 parts by weight of the moisture absorbent (40 "), preferably 2.4 to 3.6 parts by weight, more preferably 2.7 to 3.3 parts by weight. parts, more preferably 2.8 to 3.2 parts by weight, and if less than 2.0 parts by weight, the desired effect of removing moisture from the first encapsulating resin layer 11 cannot be achieved, so rollable organic electronics There may be a problem that the durability of the device is reduced, and when it contains more than 4.0 parts by weight, the reliability of the rollable organic electronic device is lowered due to poor adhesion such as adhesion and adhesion with the rollable organic electronic device due to lack of wettability. there may be

Furthermore, the first sealing resin layer 11 of the present invention may be formed to further include a curing agent in addition to the sealing resin and the moisture absorbent 40 ″.

The curing agent included in the first encapsulation layer 11 may be included without limitation as long as it is a material that can be used as a curing agent in general, and preferably serves as a crosslinking agent to ensure sufficient crosslinking density of the encapsulation layer 11 . may include

Specifically, the curing agent is an amine such as an aliphatic amine, an aromatic amine, an alicyclic amine, a secondary amine, a tertiary amine, or a BF ₃ amine. Curing agent, imidazole curing agent, amide curing agent such as dicyanamide, sulfide curing agent, phenol curing agent, mercaptan curing agent, isocyanate It may include at least one selected from a curing agent and an acid anhydride-based curing agent, and more preferably an imidazole-based curing agent.

In addition, the first encapsulation resin layer 11 of the present invention is 0.1 to 2.0 parts by weight of the curing agent, preferably 0.7 to 1.3 parts by weight, more preferably 0.8 to 1.2 parts by weight, even more preferably based on 100 parts by weight of the encapsulating resin. It may contain 0.9 to 1.1 parts by weight, and if it contains less than 0.1 parts by weight, it is not possible to achieve the desired gelation rate and modulus, and there may be a problem that the elasticity is lowered, and it may contain more than 2.0 parts by weight. In this case, there may be problems of panel adhesion failure due to high modulus and hardness, and a decrease in adhesive strength due to deterioration of wettability.

Next, the second sealing resin layer 12 of the present invention is a layer in direct contact with the metal layer 20, and may be formed by including the sealing resin and the moisture absorbent 40'.

The sealing resin included in the second sealing resin layer 12 may include a pressure-sensitive adhesive composition, and preferably has a storage elastic modulus of 0.01 to 1.0 MPa, preferably 0.05 to 0.5 MPa, measured by the following measuring method 1, More preferably, it is 0.1 to 0.3 MPa, and may include a thermoplastic elastomer having a loss modulus of 0.005 to 0.1 MPa, preferably 0.01 to 0.05 MPa. If the storage elastic modulus and loss elastic modulus of the thermoplastic elastomer are less than the stated numerical ranges, there may be defects such as steaming and omission.

[Measurement method 1]

의 온도구간, 5℃/min의 승온 속도, 15rad/s의 주파수 및 0.1N의 축방향력(axial force) 조건에서 25℃일 때의 저장 탄성률(Storage Modulus) 및 손실 탄성률(Loss Modulus)을 각각 측정한다. 이 때, 측정장비로는 Rheometer 장비(ARES-G2, Ta Instruments)가 사용될 수 있다.After punching out the cured thermoplastic elastomer to a thickness of 800 μm to have a circular diameter of 6 mm, 10-110

The storage modulus and loss modulus at 25°C under the temperature range of measure In this case, a Rheometer device (ARES-G2, Ta Instruments) may be used as the measuring device.

In addition, the thermoplastic elastomer of the present invention may include at least one selected from an isobutylene-based thermoplastic elastomer, an isoprene-based thermoplastic elastomer, a urethane-based thermoplastic elastomer, a styrene-based thermoplastic elastomer, and an ester-based thermoplastic elastomer, preferably isobutyl It may include a styrene-based thermoplastic elastomer, and more preferably, a SIBS block copolymer (styrene-isobutylene-styrene block copolymer).

Meanwhile, the encapsulation resin included in the second encapsulation resin layer 12 may further include an epoxy resin in addition to the thermoplastic elastomer. At this time, the epoxy resin of the encapsulation resin included in the second encapsulation resin layer 12 is selected from a DCPD-type solid epoxy resin, a bisphenol-A-type solid epoxy resin, a bisphenol-F-type solid epoxy resin, and a novolac-type solid epoxy resin. It may include one or more types, and may preferably include a DCPD-type solid-state epoxy resin. The effect in the case of using the DCPD-type solid epoxy resin is the same as described in the first encapsulation resin layer.

In addition, the encapsulation resin included in the second encapsulation resin layer 12 contains the thermoplastic elastomer and the epoxy resin in a weight ratio of 1:0.7 to 1.3, preferably 1:0.8 to 1.2 by weight, more preferably 1:0.9 to 1.1 by weight, Even more preferably, it may be included in a weight ratio of 1:0.95 to 1.05, if the weight ratio is less than 1:0.7, there may be a problem of lowering peel strength, and if it exceeds 1:1.3, there may be problems in moisture resistance and coating quality have.

The desiccant 40' included in the second encapsulation resin layer 12 can be used without limitation as long as it is a desiccant used for packaging of rollable organic electronic devices, and preferably includes zeolite, titania, zirconia or montmorillonite. It may include at least one of a desiccant, a metal salt, and a metal oxide, and more preferably a metal oxide.

Metal oxides are silica (SiO ₂ ), alumina (Al ₂ O ₃ ), lithium oxide (Li ₂ O), sodium oxide (Na ₂ O), barium oxide (BaO), calcium oxide (CaO) or magnesium oxide (MgO) It may include one or more of metal oxides, such as organic metal oxides, and phosphorus pentoxide (P ₂ O _{5 ).}

Metal salts are lithium sulfate (Li ₂ SO ₄ ), sodium sulfate (Na ₂ SO ₄ ), calcium sulfate (CaSO ₄ ), magnesium sulfate (MgSO ₄ ), cobalt sulfate (CoSO ₄ ), gallium sulfate (Ga ₂ (SO ₄ ) _{3 )} ), sulfates such as titanium sulfate (Ti(SO ₄ ) ₂ ) or nickel sulfate (NiSO ₄ ), calcium chloride (CaCl ₂ ), magnesium chloride (MgCl ₂ ), strontium chloride (SrCl ₂ ), yttrium chloride (YCl ₃ ), Copper chloride (CuCl ₂ ), cesium fluoride (CsF), tantalum fluoride (TaF ₅ ), niobium fluoride _{(NbF 5} ), lithium bromide (LiBr), calcium bromide (CaBr ₂ ), cesium bromide (CeBr ₃ ), selenium bromide ( Metal halides such as SeBr ₄ ), vanadium bromide (VBr ₃ ), magnesium bromide (MgBr ₂ ), barium iodide (BaI ₂ ) or magnesium iodide (MgI ₂ ), and barium perchlorate (Ba(ClO ₄ ) ₂ ) or magnesium perchlorate (Mg(ClO ₄ ) ₂ ) may include at least one of metal chlorates.

It is recommended to use a desiccant with a purity of 95% or more. If the purity is less than 95%, the moisture absorption function is lowered, and the material contained in the desiccant acts as an impurity, which can cause defects in the encapsulant, and rollable organic electronic devices. may also affect, but is not limited to.

In addition, the moisture absorbent 40 ′ included in the second encapsulation resin layer 12 may most preferably include calcium oxide (CaO), which has an advantage in that moisture resistance is improved. In addition, the moisture absorbent 40' included in the second encapsulation resin layer 12 is not limited in shape or particle size, but preferably may have an amorphous or spherical shape, and an average particle diameter of 0.1 to 20 μm, preferably 0.5 to 10 μm, more preferably 1.5 to 4 μm.

If the average particle diameter is less than 0.1 μm, there may be a problem in that the specific surface area increases to decrease the peel strength from the adherend, and if it exceeds 20 μm, there may be a problem in that the coating process is defective.

On the other hand, the second sealing resin layer 12 of the present invention, based on 100 parts by weight of the sealing resin, 48 to 90 parts by weight of the moisture absorbent 40', preferably 54 to 83 parts by weight, more preferably 61 to 76 parts by weight. parts, more preferably 65 to 73 parts by weight, and if less than 48 parts by weight, the desired effect of removing moisture from the second encapsulation resin layer 12 cannot be achieved, so rollable organic electronics There may be a problem that the durability of the device is deteriorated, and when it contains more than 90 parts by weight, the adhesive performance is significantly reduced, and due to excessive volume expansion when moisture is absorbed, the interlayer and/or encapsulation layer 10 and the rollable organic electronic There may be a problem of shortening the lifespan of the rollable organic electronic device because the devices are excited and moisture rapidly penetrates between them.

Furthermore, the second sealing resin layer 12 of the present invention may be formed to further include a curing agent in addition to the sealing resin and the moisture absorbent 40'.

The curing agent included in the second sealing resin layer 12 may be included without limitation as long as it is a material that can be used as a curing agent in general. may include

Specifically, amine-based curing agents such as aliphatic amines, aromatic amines, alicyclic amines, secondary amines, tertiary or BF ₃ amines, imidazole-based curing agents, amide-based curing agents such as dicyanamide, sulfide-based curing agents, and phenol-based curing agents , may include at least one selected from a mercaptan-based curing agent, an isocyanate-based curing agent, and an acid anhydride-based curing agent, and preferably may include an imidazole-based curing agent. The effect according to this is the same as described for the curing agent of the first encapsulation resin layer.

In addition, the second sealing resin layer 12 of the present invention is based on 100 parts by weight of the sealing resin, 2.5 to 9.0 parts by weight of the curing agent, preferably 3.5 to 6.5 parts by weight, more preferably 4.0 to 6.0 parts by weight, even more preferably It may contain 4.5 to 5.5 parts by weight, and if it contains less than 2.5 parts by weight, it is not possible to achieve the desired gelation rate and modulus, and there may be a problem of lowering elasticity, and it may contain more than 9.0 parts by weight. In this case, there may be problems of panel adhesion failure due to high modulus and hardness, and deterioration of peel strength due to deterioration of wettability.

Meanwhile, the first encapsulation resin layer 11 and the second encapsulation resin layer 12 have a thickness ratio of 1:1.0 to 8.0, preferably a thickness ratio of 1:1.5 to 3.1, and more preferably a thickness ratio of 1:1.8 to 2.8. , more preferably a thickness ratio of 1:2.1 to 2.6, more preferably a thickness ratio of 1:2.2 to 2.5. If the thickness ratio is less than 1:1.0, there may be a problem of deterioration of moisture resistance due to insufficient absolute amount of the desiccant. have.

In addition, the thickness of the first encapsulant layer 11 of the present invention may be 1 to 20 μm, preferably 7 to 18 μm, more preferably 10 to 18 μm, still more preferably 13 to 17 μm, The thickness of the second encapsulation resin layer 12 of the present invention may be 25 to 60 µm, preferably 25 to 50 µm, more preferably 30 to 40 µm, even more preferably 32 to 38 µm.

In addition, the first encapsulant layer 11 and the second encapsulant layer 12 may be a dried encapsulant layer or a cured encapsulant layer.

The metal layer 20 of the present invention includes iron (Fe), bismuth (Bi), tin (Sn), indium (In), silver (Ag), copper (Cu), zinc (Zn), antimony (Sb), nickel (Ni), chromium (Cr), and may include at least one selected from alloys thereof.

Preferred examples include bismuth (Bi), tin (Sn), indium (In), silver (Ag), copper (Cu), zinc (Zn), antimony (Sb), nickel (Ni), chromium (Cr), etc. It includes a metal sheet of stainless steel material containing can

In addition, the thickness of the metal layer 20 may be 60㎛ ~ 150㎛, preferably 70㎛ ~ 120㎛, more preferably 75㎛ ~ 105㎛.

The release layer 30 of the present invention may be a release sheet material generally used in the art as a release sheet material, and for example, PET (polyethylene terephthalate), paper (Paper), PI ( Poly imide) and PE (Poly Ester) may include one or two or more selected from.

In addition, the thickness of the release layer 30 may be 15㎛ ~ 75㎛, preferably 25㎛ ~ 60㎛, more preferably 35㎛ ~ 55㎛.

Furthermore, referring to FIG. 2 , the rollable organic electronic device of the present invention includes a substrate 1 , a rollable organic electronic device 2 and a rollable organic electronic device 2 formed on at least one surface of the substrate 1 . It may include the encapsulant 10 for a rollable organic electronic device of the present invention for packaging.

The substrate 1 is preferably any one of a glass substrate, a quartz substrate, a sapphire substrate, a plastic substrate, and a flexible polymer film that can be bent.

The rollable organic electronic device 2 formed on at least one surface of the substrate 1 includes a thin film of a lower electrode on the substrate 1 and sequentially stacking an n-type semiconductor layer, an active layer, a p-type semiconductor layer, and an upper electrode thereon. It may be formed by post-etching, or may be formed by disposing it on the substrate 1 after being prepared through a separate substrate. A specific method of forming the rollable organic electronic device 2 on the substrate 1 can be based on a known and customary method in the art, and the present invention is not particularly limited, and the rollable organic electronic device 2 ) may be an organic light emitting diode.

Next, the rollable organic electronic device encapsulant 10 of the present invention packages the rollable organic electronic device 2 , and the specific method of packaging may be a known conventional method, and in the present invention, do not limit As a non-limiting example, the first encapsulation resin layer 11 of the rollable organic electronic device encapsulant 10 on the rollable organic electronic device 2 formed on the substrate 1 is formed on the rollable organic electronic device. (2) It can be carried out by applying heat and/or pressure using a vacuum press or a vacuum laminator in a state in which it is in direct contact. In addition, heat may be applied to harden the encapsulant 10 for rollable organic electronic devices, and in the case of the encapsulant including a photocurable encapsulant resin, the encapsulant may be moved to a chamber irradiated with light to further undergo a curing process.

Hereinafter, the present invention will be described with reference to the following examples. At this time, the following examples are only presented to illustrate the invention, and the scope of the present invention is not limited by the following examples.

Example 1: Preparation of an encapsulant for a rollable organic electronic device

(1) Preparation of the first encapsulation resin layer

A first mixture was prepared by mixing a phenoxy resin (PKHB, Inchem) having a weight average molecular weight of 32,000 g/mol and an epoxy resin in a weight ratio of 1:1.

The epoxy resin is a DCPD-type (dicyclopentadiene) solid epoxy resin containing the structure of Formula 2 as the first epoxy resin, and a silicone-modified liquid epoxy resin (KSR-177, Kukdo Chemical) as the second epoxy resin in a ratio of 1:1.5 Resins mixed in a weight ratio were used.

[Formula 2]

With respect to 100 parts by weight of the first mixture, 3 parts by weight of silica having an average particle diameter of 0.5 μm as a moisture absorbent was added, and the mixture was mixed at a temperature of 25° C. for 2 hours to prepare a second mixture.

1 part by weight of an imidazole-based curing agent (2PZCNS-PW, Shikokuwaseong) was mixed with the second mixture with respect to 100 parts by weight of the first mixture, and mixed at a temperature of 25° C. for 1 hour to prepare a third mixture.

The prepared third mixture was adjusted to a viscosity of 400cps at a temperature of 20℃, passed through a capsule filter to remove foreign substances, and then applied using a slot die coater to a 75℃ thick release anti-distortion release PET (RES751, Toray) After removing the solvent by drying at a temperature of 120° C., a first encapsulation resin layer having a final thickness of 15 μm was prepared.

(2) Manufacturing of the second encapsulation resin layer

A SIBS (Styten-isoButylene-Styrene) block copolymer having a storage modulus of 0.15 MPa and a loss modulus of 0.02 MPa measured by the following measuring method 1 as a thermoplastic elastomer, a DCPD-type solid epoxy resin comprising the structure of Formula 2 A first mixture was prepared by mixing a thermoplastic elastomer and an epoxy resin as an epoxy resin in a weight ratio of 1:1.

[Measurement method 1]

After the thermoplastic elastomer cured to a thickness of 800 μm was punched to have a circular diameter of 6 mm, a temperature range of 10 to 110° C., a temperature increase rate of 5° C./min, a frequency of 15 rad/s, and an axial force of 0.1 N ( The storage modulus and loss modulus at 25° C. were measured under the axial force) condition, respectively.

Specifically, a thermoplastic elastomer cured to a thickness of 800 μm was punched out to have a circular diameter of 6 mm, and then using a rheometer device (ARES-G2, TA Instruments) at a temperature of 25° C., a frequency of 15 rad/s, and 0.1 The storage modulus and loss modulus are measured under the axial force condition of N.

69 parts by weight of calcium oxide (CaO) having an average particle diameter of 3 μm was added as a moisture absorbent to 100 parts by weight of the first mixture, and then mixed at a temperature of 25° C. for 2 hours to prepare a second mixture.

With respect to 100 parts by weight of the first mixture, 5 parts by weight of an imidazole-based curing agent (2PZCNS-PW, Shikoku Chemical) was further mixed with the second mixture, and mixed at a temperature of 25° C. for 1 hour to prepare a third mixture.

The third mixture was adjusted to a viscosity of 600 cps at a temperature of 20 ° C., passed through a capsule filter to remove foreign substances, and then applied to 36 μm thick antistatic release PET (TG65R, SKC) using a slot die coater, After removing the solvent by drying at a temperature of 160° C., a second encapsulation resin layer having a final thickness of 35 μm was prepared.

(3) Manufacture of encapsulant

An encapsulant was prepared by laminating the prepared first encapsulating resin layer to face the second encapsulating resin layer and passing it through a 70° C. lamirol.

Example 2: Preparation of an encapsulant for rollable organic electronic devices

An encapsulant was prepared in the same manner as in Example 1. However, unlike Example 1, an encapsulant was prepared using NBR (nitrile butadiene rubber) having a storage elastic modulus of 0.11 MPa and a loss elastic modulus of 0.01 MPa as the thermoplastic elastomer of the encapsulation resin of the second encapsulation resin layer.

Example 3: Preparation of an encapsulant for a rollable organic electronic device

An encapsulant was prepared in the same manner as in Example 1. However, unlike Example 1, an encapsulant was prepared by mixing a thermoplastic elastomer and an epoxy resin in a weight ratio of 1:0.6 as the encapsulating resin of the second encapsulating resin layer, and an encapsulant was prepared using this.

Example 4: Preparation of an encapsulant for rollable organic electronic devices

An encapsulant was prepared in the same manner as in Example 1. However, unlike Example 1, an encapsulant was prepared by mixing a thermoplastic elastomer and an epoxy resin in a weight ratio of 1:1.4 as the encapsulation resin of the second encapsulation resin layer, and an encapsulant was prepared using this.

Example 5: Preparation of encapsulant for rollable organic electronic device

An encapsulant was prepared in the same manner as in Example 1. However, unlike Example 1, an encapsulant was prepared by mixing a phenoxy resin and an epoxy resin in a weight ratio of 1:0.6 as an encapsulation resin of the first encapsulation resin layer, and an encapsulant was prepared using this.

Example 6: Preparation of encapsulant for rollable organic electronic device

An encapsulant was prepared in the same manner as in Example 1. However, unlike Example 1, an encapsulation resin was prepared by mixing a phenoxy resin and an epoxy resin in a weight ratio of 1:1.4 as an encapsulation resin of the first encapsulation resin layer, and an encapsulant was prepared using this.

Example 7: Preparation of encapsulant for rollable organic electronic device

An encapsulant was prepared in the same manner as in Example 1. However, unlike Example 1, an encapsulant was prepared using a mixture of the first epoxy resin and the second epoxy resin in a weight ratio of 1:4 as the epoxy resin of the encapsulation resin of the first encapsulation resin layer.

Example 8: Preparation of encapsulant for rollable organic electronic device

An encapsulant was prepared in the same manner as in Example 1. However, unlike Example 1, an encapsulant was prepared using a mixture of the first epoxy resin and the second epoxy resin in a weight ratio of 1:0.67 as the epoxy resin of the encapsulation resin of the first encapsulation resin layer.

Comparative Example 1: Preparation of an encapsulant for rollable organic electronic devices

An encapsulant was prepared in the same manner as in Example 1, but the physical properties of the specimen were different under different curing conditions in the evaluation step below.

Comparative Example 2: Preparation of an encapsulant for a rollable organic electronic device

A first encapsulation resin layer was prepared in the same manner as in Example 1. Unlike Example 1, the second encapsulation resin layer was prepared by adding 25 parts by weight of a tackifier (R1010, Eastman) to 100 parts by weight of the thermoplastic elastomer and using a different curing agent (M200, Miwon Special Chemical) to 6 parts by weight, UV A mixture was prepared by mixing 1 part by weight of an initiator (irgacure TPO, Ciba) and 88 parts by weight of calcium oxide having an average particle diameter of 3 μm as a moisture absorbent. In this case, the same resin as in Example 1 was used as the thermoplastic elastomer.

The prepared mixture was adjusted to a viscosity of 600 cps at a temperature of 20 ° C, passed through a capsule filter to remove foreign substances, and then applied to 36 μm thick antistatic release PET (TG65R, SKC) using a slot die coater, and then After removing the solvent by drying at a temperature of 120° C., a second encapsulation resin layer having a final thickness of 35 μm was prepared.

Comparative Example 3: Preparation of an encapsulant for a rollable organic electronic device

An encapsulant was prepared in the same manner as in Example 1. However, unlike Example 1, an encapsulant was prepared using only a phenoxy resin, without using an epoxy resin as an encapsulating resin for the first encapsulating resin layer.

Comparative Example 4: Preparation of an encapsulant for rollable organic electronic devices

An encapsulant was prepared in the same manner as in Example 1. However, unlike Example 1, an encapsulant was manufactured using only a thermoplastic elastomer without using an epoxy resin as an encapsulant of the second encapsulation resin layer.

The composition of each layer of the encapsulant according to the Examples and Comparative Examples is shown in Tables 1 to 3 below.

Example 1 Example 2 Example 3 Example 4 1st bag
resin layer plastic bag
(parts by weight) PKHB
(50.0)
DCPD Epoxy ^†
(20.0)
KSR-177
(30.0) PKHB
(50.0)
DCPD Epoxy ^†
(20.0)
KSR-177
(30.0) PKHB
(50.0)
DCPD Epoxy ^†
(20.0)
KSR-177
(30.0) PKHB
(50.0)
DCPD Epoxy ^†
(20.0)
KSR-177
(30.0) hardener
(parts by weight) 2PZCNS-PW
(1.0) 2PZCNS-PW
(1.0) 2PZCNS-PW
(1.0) 2PZCNS-PW
(1.0) desiccant
(Particle size, parts by weight) Silica
(0.5㎛, 3.0) Silica
(0.5㎛, 3.0) Silica
(0.5㎛, 3.0) Silica
(0.5㎛, 3.0) thickness 15㎛ 15㎛ 15㎛ 15㎛ 2nd bag
resin layer
plastic bag
(parts by weight) SIBS block copolymer
(50.0)
DCPD Epoxy ^†
(50.0) NBR
(50.0)
DCPD Epoxy ^†
(50.0) SIBS block copolymer
(62.5)
DCPD Epoxy ^†
(37.5) SIBS block copolymer
(41.7)
DCPD Epoxy ^†
(58.3) hardener
(parts by weight) 2PZCNS-PW
(5.0) 2PZCNS-PW
(5.0) 2PZCNS-PW
(5.0) 2PZCNS-PW
(5.0) desiccant
(Particle size, parts by weight) CaO
(3㎛, 69.0) CaO
(3㎛, 69.0) CaO
(3㎛, 69.0) CaO
(3㎛, 69.0) thickness 35㎛ 35㎛ 35㎛ 35㎛ Etc

^† A solid epoxy resin comprising a structure represented by Formula 2 above.

Example 5 Example 6 Example 7 Example 8 1st bag
resin layer plastic bag
(parts by weight) PKHB
(62.5)
DCPD Epoxy ^†
(15.0)
KSR-177
(22.5) PKHB
(41.7)
DCPD Epoxy ^†
(23.3)
KSR-177
(35) PKHB
(50)
DCPD Epoxy ^†
(10.0)
KSR-177
(40.0) PKHB
(50)
DCPD Epoxy ^†
(30.0)
KSR-177
(20.0) hardener
(parts by weight) 2PZCNS-PW
(1.0) 2PZCNS-PW
(1.0) 2PZCNS-PW
(1.0) 2PZCNS-PW
(1.0) desiccant
(Particle size, parts by weight) Silica
(0.5㎛, 3.0) Silica
(0.5㎛, 3.0) Silica
(0.5㎛, 3.0) Silica
(0.5㎛, 3.0) thickness 15㎛ 15㎛ 15㎛ 15㎛ 2nd bag
resin layer plastic bag
(parts by weight) SIBS block copolymer
(50.0)
DCPD Epoxy ^†
(50.0) SIBS block copolymer
(50.0)
DCPD Epoxy ^†
(50.0) SIBS block copolymer
(50.0)
DCPD Epoxy ^†
(50.0) SIBS block copolymer
(50.0)
DCPD Epoxy ^†
(50.0) hardener
(parts by weight) 2PZCNS-PW
(5.0) 2PZCNS-PW
(5.0) 2PZCNS-PW
(5.0) 2PZCNS-PW
(5.0) desiccant
(Type, part by weight) CaO
(3㎛, 69.0) CaO
(3㎛, 69.0) CaO
(3㎛, 69.0) CaO
(3㎛, 69.0) thickness 35㎛ 35㎛ 35㎛ 35㎛ Etc

^† A solid epoxy resin comprising a structure represented by Formula 2 above.

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 1st bag
resin layer plastic bag
(parts by weight) PKHB
(50.0)
DCPD Epoxy ^†
(20.0)
KSR-177
(30.0) PKHB
(50.0)
DCPD Epoxy ^†
(20.0)
KSR-177
(30.0) PKHB
(100.0) PKHB
(50.0)
DCPD Epoxy ^†
(20.0)
KSR-177
(30.0) hardener
(parts by weight) 2PZCNS-PW
(1.0) 2PZCNS-PW
(1.0) 2PZCNS-PW
(1.0) 2PZCNS-PW
(1.0) desiccant
(Particle size, parts by weight) Silica
(0.5㎛, 3.0) Silica
(0.5㎛, 3.0) Silica
(0.5㎛, 3.0) Silica
(0.5㎛, 3.0) thickness 15㎛ 15㎛ 15㎛ 15㎛ 2nd bag
resin layer plastic bag
(parts by weight) SIBS block copolymer
(50.0)
DCPD Epoxy ^†
(50.0) SIBS block copolymer
(100.0) SIBS block copolymer
(50.0)
DCPD Epoxy ^†
(50.0) SIBS block copolymer
(100.0) hardener
(parts by weight) 2PZCNS-PW
(5.0) M200 ^‡
(6.0) 2PZCNS-PW
(5.0) 2PZCNS-PW
(5.0) desiccant
(Type, part by weight) CaO
(3 μm, 69) CaO
(3㎛, 88) CaO
(3 μm, 69) CaO
(3㎛, 69) thickness 35㎛ 35㎛ 35㎛ 35㎛ Etc Curing at 100℃ for 0.5hr 1) The second encapsulation resin layer contains the following for 100 parts by weight of the encapsulation resin: tackifier ^*
(25.0)
UV Initiator ^**
(1.0)
2) The curing condition is UV curing

^† A solid epoxy resin comprising a structure represented by Formula 2 above. ^‡ Miwon Specialty Chemicals

^* Tackifier: R1010, Eastman

^** UV initiator: irgacure TPO, Ciba

Experimental Example 1

The following physical properties were measured for the encapsulants prepared in Examples and Comparative Examples, and are shown in Tables 4 to 6 below.

1. Glass adhesion evaluation

For the encapsulants prepared according to Examples and Comparative Examples, the adhesive force measuring tape (7475, TESA) was laminated on the upper surface of the second encapsulant resin from which the release PET was removed through a 2 kg hand roller, and the sample (= After cutting the encapsulant) to a width of 25 mm and a length of 120 mm, the first encapsulant resin layer from which the release PET was removed at 50 ° C. was roll-laminated on alkali-free glass, and then heat-treated at 100 ° C. for 2.5 hours to harden the encapsulant. At this time, in the case of Comparative Example 1, heat curing was performed only at 100° C. for 30 minutes, and Comparative Example 2 was replaced with photocuring by exposing the encapsulant to UV light instead of heat. After the heat treatment was completed, the sample was left at room temperature (=25° C.) for 30 minutes, peeled off at a rate of 300 mm/min through a universal material testing machine (UTM), and glass adhesion was measured.

2. Evaluation of water penetration of encapsulants

After cutting the encapsulant prepared according to Examples and Comparative Examples to a size of 95 mm × 95 mm, and after removing the protective film on 100 mm × 100 mm alkali-free glass, the specimen is placed 2.5 mm inside from the edge of the four sides of the alkali-free glass. After fitting well, it was attached using a roll laminator heated to 65°C. After removing the release film remaining on the attached specimen, another 100mmХ100mm alkali-free glass was covered and lamination was performed at 50°C for 1 minute with a vacuum laminator to bond without air bubbles, and then heat treatment was performed at a temperature of 100°C for 2 hours and 30 minutes. The heat-treated sample was observed under a microscope for the length of moisture permeation every 100 hours in a reliability chamber set at 85° C. and 85% relative humidity.

3. Heat resistance evaluation of encapsulants

The encapsulant prepared according to the Examples and Comparative Examples was cut to a size of 50 mm × 80 mm, and the second encapsulant layer from which the release PET was removed was attached to a 60 mm × 150 mm 0.08T Ni alloy at 80° C. using a roll laminator. did The first encapsulation resin layer, from which the release PET remaining on the attached specimen was removed, was attached to 30 mm × 150 mm 5T alkali-free glass using a roll laminator at 50° C., and then heat-treated at 100° C. for 2 hours and 30 minutes. After the specimen attached to the glass was vertically fixed in a chamber at 100°C, a 1 kg weight was hung to determine the flow. At this time, when there is no abnormality in the evaluation result, it is indicated by ○, and when it flows even a little, it is indicated by ×.

4. Rolling appearance evaluation

The encapsulant prepared according to the Examples and Comparative Examples was cut to a size of 280 mm × 500 mm, and the second encapsulation resin layer from which the release PET was removed was attached to a 300 mm × 550 mm 0.08T Ni alloy at 80° C. using a roll laminator. Then, the release PET of the first encapsulation resin layer was removed, and PET that had not been subjected to release treatment of the same size was attached using a roll laminator at 80 ° C., and then heat treatment was performed at 100 ° C. for 2 hours and 30 minutes. . After the heat treatment was completed, the sample was wound around the circle (50R) jig) so that the PET side was in contact with the tape, and it was left for 240 hours in a reliability chamber set at 60°C and 90% relative humidity, and then the side of the sample was observed under a microscope. .

At this time, when there is no abnormality in the evaluation result, it is indicated by ○, when any abnormality such as interfacial separation, cracks, and separation between the first and second sealing resin layers occurs is indicated by ×.

Experimental Example 2

An organic light emitting device (hole transport layer NPD/thickness 800A, light emitting layer Alq3/thickness 300A, electron injection layer LiF/thickness 10A, cathode Al + Liq/thickness 1,000 A) on a substrate with an ITO pattern is deposited and laminated on the fabricated device. After laminating the encapsulant according to Examples and Comparative Examples at room temperature, an OLED unit specimen emitting green light was prepared. Thereafter, the following physical properties were evaluated for the specimens and are shown in Tables 4 to 6.

1. Durability evaluation of organic light emitting device according to moisture penetration of encapsulant

In the environment of 85 ℃, 85% relative humidity of each specimen, pixel shrinkage and dark spot generation and/or growth in the light emitting part for each time period were measured with a digital microscope of ×100 in units of 100 hours. By observing, the time taken until the pixel reduction occurred by 50% or more and/or the dark spot was generated was measured and shown in Tables 4 to 6.

At this time, when 50% or more of pixel reduction occurs and the time required to create a dark spot is 1,000 hours or more ◎, When 50% or more of pixel reduction occurs and the time required to create a dark spot is less than 1000 to 800 hours or more ○, 50% or more of pixel reduction When the time required for occurrence and dark spot generation was less than 800 hours to 600 hours or more, △, and when the pixel reduction occurred by 50% or more and the time required for dark spot generation was less than 600 hours, ×.

2. Durability evaluation of encapsulants

Specimens were observed for 1,000 hours at 100 hour intervals in a reliability chamber set at 85°C and 85% relative humidity to examine the interface separation between the organic electronic device and the encapsulant, cracks or bubbles in the adhesive film, and separation between the adhesive layers using an optical microscope. Tables 4 to 6 were shown to evaluate whether physical damage was observed through observation. In the case of no abnormality as a result of the evaluation, it is indicated by ○, when any abnormality occurs, such as interfacial separation, cracks or bubbles in the encapsulant, and separation between the first and second encapsulant layers.

Experimental Example 3: Elastic Modulus Evaluation

Each of the 16 encapsulants having a thickness of 50 μm prepared in the Examples and Comparative Examples with the release PET removed was laminated (roll lamination at 50° C., gap 2 mm, speed 1) to obtain an encapsulant having a thickness of 800 μm. prepared, and heat treatment was performed at 100° C. for 2.5 hours. The heat-treated samples were shown in Tables 4 to 6 by measuring the storage modulus at 25° C. and 60° C. under the following measurement conditions through DMA equipment (Q850, TA Instruments).

- Ramp Up

- Initial temperature is -40℃

- Final temperature 110℃

- Temperature increase rate 5℃/min

- Frequency 1Hz

- Initial force 0.01N

Experimental Example 4: Peel strength evaluation

The encapsulant prepared according to Examples and Comparative Examples was cut to a width of 40 mm and a length of 60 mm, and the release PET of the second encapsulant layer of the encapsulant was removed, and then laminated on a nickel alloy sheet having a width of 50 mm, a length of 150 mm, and a thickness of 0.08 mm. (80 degreeC, gap 2 mm, speed 1) was carried out by roll lamination. After that, it is cut to a width of 10 mm and a length of 150 mm, and the release PET of the first encapsulation resin layer of the encapsulant is removed and laminated on glass (roll lamination at 50° C., gap 2 mm, speed 1), and then at 100° C. for 2 hours 30 Minute heat treatment was performed. Using UTM equipment (OTT-0006, OrentalTM) for the heat-treated encapsulant, the peel strength of the encapsulant was measured under the following measurement conditions at 25 ° C and 60 ° C (measured after 10 minutes of stabilization). 4 to 6 are shown.

[Measuring conditions]

- Peel mode: 180˚ peel

- Measuring speed: 10mm/sec

- Peeling length: 50mm (10sec)

division Example 1 Example 2 Example 3 Example 4 adhesion
film storage modulus
(MPa) 25℃ 1,510 1,655 1,228 1,685 60℃ 1,322 1,212 904 1,517 peel strength
(gf/10mm) 25℃ 2,058 1,952 1,514 2,275 60℃ 1,859 1,689 1,025 2,158 glass adhesion
(gf/25mm) 2,847 2,759 2,458 2,852 Water penetration length (㎛) 3.2 4.7 3.1 3.4 Heat resistance evaluation ○ ○ ○ ○ Rolling appearance evaluation ○ ○ ○ ○ OLED
Psalter organic light emitting device
Durability evaluation ◎ ◎ ◎ ◎ of encapsulant
Durability evaluation ○ ○ ○ ○

division Example 5 Example 6 Example 7 Example 8 adhesion
film storage modulus
(MPa) 25℃ 1,248 1,598 1,262 1,621 60℃ 953 1,387 1,022 1,422 peel strength
(gf/10mm) 25℃ 1985 1,924 2010 1985 60℃ 1,715 1,695 1,726 1,710 glass adhesion
(gf/25mm) 2,652 2,662 2,915 2,120 Water penetration length (㎛) 3.2 3.3 3.3 3.2 Heat resistance evaluation ○ ○ ○ ○ Rolling appearance evaluation ○ ○ ○ ○ OLED
Psalter organic light emitting device
Durability evaluation ◎ ◎ ◎ ◎ of encapsulant
Durability evaluation ○ ○ ○ ○

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 adhesion
film storage modulus
(MPa) 25℃ 849 514 821 421 60℃ 914 254 110 28 peel strength
(gf/10mm) 25℃ 957 925 458 350 60℃ 1,088 60 30 21 glass adhesion
(gf/25mm) 2,426 1,248 2,137 2,122 Water penetration length (㎛) 5.0 4.8 4.2 4.8 Heat resistance evaluation ○ × × × Rolling appearance evaluation ○ × × × OLED
Psalter organic light emitting device
Durability evaluation ◎ × ○ × of encapsulant
Durability evaluation ○ × × ×

Simple modifications or changes of the present invention can be easily carried out by those of ordinary skill in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

Claims (17)

An encapsulant layer formed including an encapsulation resin containing an epoxy resin and a moisture absorbent; including,
The encapsulation layer may include a first encapsulation layer; and a second encapsulating resin layer formed on one surface of the first encapsulating resin layer.
The encapsulation resin of the first encapsulation resin layer further comprises a polymer resin having a weight average molecular weight of 10,000 to 300,000 g/mol,
The encapsulation resin of the second encapsulation resin layer includes a thermoplastic elastomer having a storage elastic modulus of 0.01 to 1.0 MPa and a loss elastic modulus of 0.005 to 0.1 MPa measured by the following measuring method 1,
The encapsulant layer is an encapsulant for a rollable organic electronic device, characterized in that it satisfies the following relation:
[Relational Expression 1]
1.0 ≤ A/B ≤ 15.0
In Relation 1, A is the peel strength (gf/10mm) of the cured encapsulant layer measured using UTM equipment at a temperature of 25° C., and B is measured using UTM equipment at a temperature of 60° C. Peel strength (gf/10mm) of one cured encapsulant layer,
[Measurement method 1]
After the thermoplastic elastomer cured to a thickness of 800 μm was punched to have a circular diameter of 6 mm, a temperature range of 10 to 110, a temperature increase rate of 5° C./min, a frequency of 15 rad/s, and an axial force of 0.1 N force), the storage modulus and loss modulus at 25° C. are measured, respectively.
According to claim 1,
Wherein A is 700 gf / 10mm or more, and B is 500 gf / 10mm or more.
3. The method of claim 2,
Wherein A is 1400 to 2600 gf / 10mm, and B is 1260 to 2340 gf / 10mm.
According to claim 1,
The polymer resin having a weight average molecular weight of 10,000 to 300,000 g/mol is a rollable organic electronic device comprising at least one selected from a phenoxy resin, an acrylic resin, a nitrile-based rubber resin, and a urethane resin. encapsulant.
5. The method of claim 4,
The polymer resin having a weight average molecular weight of 10,000 to 300,000 g/mol is an encapsulant for a rollable organic electronic device, characterized in that it comprises a compound represented by the following Chemical Formula 1:
[Formula 1]

In Formula 1, n is an integer of 12 to 330.
According to claim 1,
The thermoplastic elastomer is rollable, comprising at least one selected from an isobutylene-based thermoplastic elastomer, an isoprene-based thermoplastic elastomer, a urethane-based thermoplastic elastomer, a styrene-based thermoplastic elastomer, a butadiene-based thermoplastic elastomer, and an ester-based thermoplastic elastomer Encapsulant for organic electronic devices.
7. The method of claim 6,
The thermoplastic elastomer is a rollable organic electronic device encapsulant, characterized in that it comprises a SIBS block copolymer (styrene-isobutylene-styrene block copolymer).
According to claim 1,
The encapsulant of the second encapsulant layer includes the thermoplastic elastomer and the epoxy resin in a weight ratio of 1:0.7 to 1.3.
According to claim 1,
The encapsulant of the first encapsulant layer is an encapsulant for a rollable organic electronic device, characterized in that it comprises a polymer resin having a weight average molecular weight of 10,000 to 300,000 g/mol and an epoxy resin in a weight ratio of 1:0.7 to 1.3.
According to claim 1,
The epoxy resin includes a first epoxy resin and a second epoxy resin different from each other in a weight ratio of 1:0.7 to 2.5,
The first epoxy resin comprises at least one selected from a DCPD-type (dicyclopentadiene) solid epoxy resin, a bisphenol-A-type solid epoxy resin, a bisphenol-F-type solid epoxy resin, and a novolak-type solid epoxy resin,
The second epoxy resin is a rollable organic electronic device encapsulant comprising at least one selected from a silicone-modified liquid epoxy resin, a urethane-modified liquid epoxy resin, and a rubber-modified liquid epoxy resin.
According to claim 1,
The first encapsulating resin layer contains 2.0 to 4.0 parts by weight of a desiccant with respect to 100 parts by weight of the encapsulating resin,
The second encapsulant layer is an encapsulant for a rollable organic electronic device, characterized in that it contains 48 to 90 parts by weight of a moisture absorbent based on 100 parts by weight of the encapsulation resin.
According to claim 1,
The first encapsulating resin layer and the second encapsulating resin layer each independently further include a curing agent.
13. The method of claim 12,
The curing agent is an amine-based curing agent including an aliphatic amine, an aromatic amine, a cycloaliphatic amine, a secondary amine, a tertiary or BF ₃ amine, an imidazole-based curing agent, an amide-based curing agent, a sulfide-based curing agent, a phenol-based curing agent, mercaptan ( mecaptan)-based curing agent, an isocyanate-based curing agent, and an acid anhydride-based curing agent.
According to claim 1,
The first encapsulating resin layer contains 0.1 to 2.0 parts by weight of a curing agent based on 100 parts by weight of the encapsulating resin,
The second encapsulant layer is an encapsulant for a rollable organic electronic device, characterized in that it contains 2.5 to 9.0 parts by weight of a curing agent based on 100 parts by weight of the encapsulation resin.
According to claim 1,
The rollable organic electronic device encapsulant, characterized in that the first encapsulation resin layer and the second encapsulation resin layer have a thickness ratio of 1:1.0 to 8.0.
16. The method of claim 15,
The first encapsulation resin layer has a thickness of 1 to 25 μm,
The second encapsulant encapsulant layer is an encapsulant for a rollable organic electronic device, characterized in that it has a thickness of 25 to 60㎛.
Board;
a rollable organic electronic device formed on at least one surface of the substrate; and
An encapsulant for a rollable organic electronic device of any one of claims 1 to 16 for packaging the rollable organic electronic device;
A rollable organic electronic device comprising a.

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