KR20200038631A - An encapsulation composition - Google Patents

Abstract

The present application relates to a composition for an encapsulant, which can increase the sensitivity to a touch sensor, to an organic film for an encapsulant formed from the composition, to a laminate comprising the organic film for an encapsulant, and to a display device. A photo-curable ink composition for an encapsulant comprises: a compound represented by chemical formula 1; a photo-curable monomer; and an initiator.

Description

Composition for encapsulants {An encapsulation composition}

The present application relates to a composition for an encapsulant. Specifically, the present application relates to a composition for an encapsulant, a film formed from the composition, a laminate comprising the film, and a display device.

In the manufacturing process of organic light emitting devices used in TVs, computers, mobile communication devices, etc., encapsulation using glass materials is performed to protect the organic layer of the organic light emitting devices from physical shock, oxygen, and / or moisture. In addition, recently, a technique for applying the above-described encapsulation treatment to a flexible electronic device has also been developed. For example, an organic / inorganic hybrid encapsulation in which an organic layer having flexible properties and an inorganic layer having excellent mechanical properties are alternately stacked is considered. In this case, in the case of the inorganic layer, it is formed through a vapor deposition method, and the organic layer can be formed using inkjet printing.

Meanwhile, in recent years, a thin-film display device in which a touch element that senses a user's touch is formed on an encapsulation layer has been developed. In such a structure, it is important to increase the sensitivity to user touch by lowering the dielectric constant of the encapsulation layer.

One object of the present application is to provide a composition for an encapsulant that can increase sensitivity to a touch sensor, an organic film for an encapsulant formed from the composition, and a laminate and a device including the same.

The above and other other objects of the present application can be solved by the present application described in detail below.

In an example related to the present application, the present application relates to a composition for an encapsulant. Specifically, the composition relates to an organic composition capable of forming an organic layer of an encapsulant located on an organic light emitting device and / or a touch sensor.

The encapsulant containing the cured product of the composition is positioned on the organic light emitting device, and may be used to suppress or prevent the organic layer of the organic light emitting device from being damaged from physical impact or from externally infiltrating materials (eg, oxygen or moisture).

In addition, as described below, the organic film for the encapsulant prepared from the composition of the present application may be located between the light emitting element and the touch sensor. In view of this, the composition for an organic film of the encapsulant of the present application is configured to increase the touch sensitivity of the touch sensor as well as the function of protecting the light-emitting element of the encapsulant.

In the present application, the composition for the encapsulant may be a solvent-free photocurable composition. That is, the composition used to form the organic film for the encapsulant described below may be a solvent-free type, and may be a composition containing a photocurable component. In the present application, "solvent-free composition" means that the composition does not contain a solvent, for example, an organic solvent or an aqueous solvent. And, in the present application, the "photocurable composition" means a composition that can be cured by radical polymerization according to light irradiation. The photocuring is for example electromagnetic waves such as microwaves, infrared rays (IR), ultraviolet rays (UV), X-rays or gamma rays, as well as alpha-particle beams, proton beams, It can be made by irradiation of a particle beam, such as a neutron beam (neutron beam) and electron beam (electron beam). The specific conditions of photocuring are not particularly limited, but, for example, when photocuring is performed by ultraviolet rays (UV), the wavelength may be in the range of about 290 to 400 nm, including the near ultraviolet region, and irradiated with ultraviolet rays The light intensity during the total time ranges from 500 to 2,500 mW / cm ² , and the light amount is from 300 to 2,500 mJ / cm ² Range.

Compared with the solvent-based composition, when the solvent-free composition is used, the drying process for the solvent may be largely omitted, so the process efficiency can be increased, and the generation of air bubbles caused by the solvent and the resulting deterioration of the sealing material function are avoided. You can. In addition, since the solvent-free composition can lower the moisture content in the ink composition, there is an advantage suitable for an organic light emitting device susceptible to moisture. And, the use of a solvent-free photocurable composition has the advantage of avoiding damage to the organic layer of the organic light emitting device that occurs during thermal curing.

Further, the composition may be a composition applied on an object to be coated by inkjet printing. Inkjet printing means a method of finely spraying a coating composition on a desired part through a nozzle and forming a film. The inkjet printing process is advantageous for mass production and large-scale panel production because it uses multiple heads with multiple nozzles. The composition is adapted to satisfy the viscosity and surface energy (tension) described below so that it can be applied to inkjet printing.

The composition may include a compound having a photocurable functional group so that photocuring is possible. Specifically, the composition may include a compound represented by Formula 1 below, a photocurable monomer, and an initiator.

[Formula 1]

In Chemical Formula 1, R1 is hydrogen or an alkyl group, Rf is a fluorinated alkyl group in which the number of carbon atoms in the alkyl group is in the range of 2 to 7, and all hydrogen of the alkyl group is substituted with fluorine.

Unless otherwise specified, the term "alkyl group" in the present specification is a straight-chain, branched or cyclic alkyl group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 4 carbon atoms. It may mean, and the alkyl group may be optionally substituted by one or more substituents. As the alkyl group in the formula (1), a linear or branched alkyl group having 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 4 carbon atoms may be exemplified.

The compound of Formula 1 may lower the dielectric constant, and as a result, increase the touch sensitivity of the touch sensor adjacent to the organic film for the encapsulant. Specifically, the inventor of the present application should use a monomer having a low polarity in order to lower the dielectric constant, and in order to lower the polarity of a compound having fluorine (F) (preferably to a non-polar level), fluorine has a symmetry within the compound It was confirmed that it is advantageous. Accordingly, the compound of Formula 1 having a photocurable functional group and low polarity is used in the composition for forming an organic film for encapsulants.

If it has the structure of Formula 1, the type of the specific compound is not particularly limited. As a non-limiting example, the compound represented by Chemical Formula 1 may be 1H, 1H, 2H, 2H-tridecafluorooctyl acrylate (1H, 1H, 2H, 2H-Tridecafluorooctyl acrylat) e) or 2,2,2 -Trifluoroethyl acrylate (2,2,2-Trifluoroethyl acrylate) and the like can be used.

The compound having the structure of Formula 1 may include 3 to 13 fluorine in the range. Specifically, the compound having the structure of Formula 1 may have 3, 5, 7, 9, 11 or 13 fluorine substituents. If the number of fluorine is less than 3, the effect of lowering the dielectric constant is not sufficient, and when it exceeds 13, the light transmittance of the encapsulant may be poor or the barrier properties to moisture and oxygen may be deteriorated because it is an obstacle to light curing.

The photocurable monomer may be a monomer containing a photocurable functional group, for example, a (meth) acrylate group or a vinyl group. As a monomer which has a (meth) acrylate group, monofunctional (meth) acrylate of mono alcohol or polyhydric alcohol, or polyfunctional (meth) acrylate of mono alcohol or polyhydric alcohol is mentioned, for example. Further, examples of the monomer having a vinyl group include an aromatic compound containing a vinyl group such as styrene or vinyl toluene. In one example, the composition may include two or more of the compounds listed above.

In one example, a monomer having a (meth) acrylate group may be used as the photocurable monomer.

Specifically, a polyfunctional monomer having two or more photocurable functional groups may be used as the photocurable monomer. Specifically, in the case of forming a film through photocuring using a radical reaction, in the surface layer of the ink composition, radical generation is reduced due to the influence of oxygen in the air and the polymerization rate is slowed, so-called reaction inhibition by oxygen may occur. have. And, as the thickness of the film becomes thinner, the ratio of the surface to the inside of the film increases, so the problem of the decrease in polymerization rate due to the above phenomenon may become more apparent. In view of this, it is possible to use a polyfunctional monomer capable of securing a curing rate faster than a monofunctional monomer. When using a polyfunctional monomer, the time (hardening time) for converting the liquid composition applied on the coated body into a solid film may be shortened, and accordingly, it may be advantageous to secure physical properties required for the organic film for the encapsulant.

The type of the polyfunctional monomer having two or more photocurable functional groups is not particularly limited. For example, polyfunctional (meth) acrylate may be used as the polyfunctional monomer.

In one example, the polyfunctional monomer having two or more photo-curable functional groups is ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di Monoalkylene glycol di (meth) acrylates including at least one of (meth) acrylate, tri (propylene glycol) di (meth) acrylate, and poly (propylene glycol) di (meth) acrylate; Polyalkylene glycol di (meth) acrylate; Or mixtures thereof.

In another example, polyfunctional monomers having two or more photocurable functional groups are 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and octanediol di (meth) acrylic. Rate, nonanediol di (meth) acrylate, decandiol di (meth) acrylate, undecanediol di (meth) acrylate, dodecanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, Di (meth) acryl of diol, triol, tetraol, tetraol, pentaol, or hexaol having 2-20 carbon atoms, including pentaerythritol di (meth) acrylate, dipentaerythritol di (meth) acrylate, and the like. Rate; Or mixtures thereof.

In another example, polyfunctional monomers having two or more photocurable functional groups include trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, and dipentaerythritol tri (meth) acrylate. Tri (meth) acrylate of triol, tetraol, pentaol or hexaol having 3 to 20 carbon atoms; Or mixtures thereof.

In another example, the polyfunctional monomer having two or more photo-curable functional groups is tetraol having 4 to 20 carbon atoms including pentaerythritol tetra (meth) acrylate, dipentaerythritol tetra (meth) acrylate, and the like. , Tetra (meth) acrylate of pentaol or hexaol; Or mixtures thereof.

In another example, the polyfunctional monomer having two or more photo-curable functional groups includes penta (meth) acrylate of pentaol or hexaol having 4-20 carbon atoms including dipentaerythritol penta (meth) acrylate and the like; Or mixtures thereof.

In another example, the polyfunctional monomer having two or more photo-curable functional groups includes hexa (meth) acrylate of hexaol having 4-20 carbon atoms including dipentaerythritol hexa (meth) acrylate and the like; Or mixtures thereof.

In one example, the composition may include two or more photocurable monomers.

In another example, the composition may include two or more polyfunctional monomers.

In one example, the composition is a multifunctional monomer, and may include a difunctional monomer having two photocurable functional groups (eg, a di (meth) acrylate monomer). Specifically, the higher the functional group, the higher the viscosity of the composition. In the case of a bifunctional monomer, it has the advantage of rapidly curing while having a lower viscosity than a monomer having a trifunctional or higher functionality. Therefore, when a bifunctional monomer is used, a fast curing speed can be secured while maintaining an appropriate level of viscosity. For example, as the bifunctional monomer, di (meth) acrylates of diol, triol, tetraol, pentaol, or hexaol having 2 to 20 carbon atoms are exemplified.

In another example, the composition may simultaneously include a bifunctional monomer and a trifunctional or higher functional monomer as a photocurable monomer. Monofunctional or higher functional monomers can prevent excessive deterioration of viscosity and contribute to providing a sufficient degree of curing. For example, as the bifunctional monomer, di (meth) acrylates of diol, triol, tetraol, pentaol, or hexaol having 2 to 20 carbon atoms are exemplified. And, as the trifunctional or higher monomer, for example, tri (meth) acrylate of triol, tetraol, pentaol or hexaol having 3 to 20 carbon atoms may be used.

In one example, in relation to the use of a trifunctional or higher functional monomer, the composition may include the bifunctional monomer in an excess of a trifunctional or higher functional monomer. Specifically, the composition may include 10 parts by weight to 65 parts by weight of a trifunctional or higher monomer, compared to 100 parts by weight of a bifunctional monomer. More specifically, the content ratio of the trifunctional or higher functional monomer is 15 parts by weight or more, 20 parts by weight or more, 25 parts by weight or more, 30 parts by weight or more, 35 parts by weight or more, 40 parts by weight or more, 45 parts by weight or more, 50 parts by weight or more Or more than 55 parts by weight. And the upper limit may be 60 parts by weight or less, 55 parts by weight or less, 50 parts by weight or less, 45 parts by weight or less, 40 parts by weight or less, 35 parts by weight or less, 30 parts by weight or less, 25 parts by weight or less or 20 parts by weight or less . When the content range is satisfied, appropriate inkjet coating properties, curability, and properties of the encapsulant can be secured.

In one example, the composition may include a methacrylate-based monomer as the multifunctional monomer. Specifically, since the viscosity of methacrylate is lower than that of acrylate, it may be preferable to use methacrylate in terms of suppressing an excessive increase in viscosity and maintaining a level of viscosity suitable for performing an inkjet process.

In one example, the composition may include, as the multifunctional monomer, an acrylate-based monomer and a methacrylate-based monomer simultaneously. Specifically, since the curing rate of acrylate is faster than methacrylate, it may be preferable to use acrylate in terms of securing physical properties through rapid curing. In consideration of this point, the composition may simultaneously include an acrylate-based monomer and a methacrylate-based monomer as a multifunctional monomer, thereby simultaneously securing an appropriate level of viscosity and a fast curing rate. For example, as a methacrylate monomer, a dimethacrylate of diol, triol, tetraol, pentaol, or hexaol having 2 to 20 carbon atoms is exemplified. As the acrylate monomer, for example, triol having 3 to 20 carbon atoms, tetraol, pentaol or hexaol may be used.

In one example, with respect to the use of a photocurable monomer, the composition can include an excess of the methacrylate monomer relative to the acrylate monomer. Specifically, the composition may include 10 parts by weight to 65 parts by weight of acrylate monomer, compared to 100 parts by weight of methacrylate monomer. More specifically, the content ratio of the trifunctional or higher functional monomer is 15 parts by weight or more, 20 parts by weight or more, 25 parts by weight or more, 30 parts by weight or more, 35 parts by weight or more, 40 parts by weight or more, 45 parts by weight or more, 50 parts by weight or more Or more than 55 parts by weight. And the upper limit may be 60 parts by weight or less, 55 parts by weight or less, 50 parts by weight or less, 45 parts by weight or less, 40 parts by weight or less, 35 parts by weight or less, 30 parts by weight or less, 25 parts by weight or less or 20 parts by weight or less . When the content range is satisfied, appropriate inkjet coating properties, curability, and properties of the encapsulant can be secured.

The type of the initiator is not particularly limited as long as it can initiate a photocuring reaction by radicals. For example, triazine-based, acetophenone-based, benzophenone-based, thioxanthone-based, benzoin-based, phosphorus-based or oxime-based may be used as the initiator. More specifically, a phosphorus initiator such as diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide or benzyl (diphenyl) phosphine oxide may be used, but is not limited thereto.

In one example, the composition may include 5 to 40 parts by weight of the compound represented by Formula 1, 55 to 95 parts by weight of the photocurable monomer, and 0.1 to 10 parts by weight of the initiator. When the content range is satisfied, an appropriate inkjet processability and an appropriate curing rate can be secured, and physical properties of the organic film for encapsulant to be secured in the present application can be secured.

More specifically, within the above range, the composition is 6 parts by weight or more, 7 parts by weight or more, 8 parts by weight or more, 9 parts by weight or more, 10 parts by weight or more, 11 parts by weight or more, 12 More than 13 parts by weight, more than 13 parts by weight, more than 14 parts by weight, more than 15 parts by weight, more than 16 parts by weight, more than 17 parts by weight, more than 18 parts by weight, more than 19 parts by weight, more than 20 parts by weight, more than 21 parts by weight, 22 More than weight parts, more than 23 parts weight, more than 24 parts weight, more than 25 parts weight, more than 26 parts weight, more than 27 parts weight, more than 28 parts weight, more than 29 parts weight, more than 30 parts weight, more than 31 parts weight parts, It may include at least 33 parts by weight, at least 33 parts by weight, at least 34 parts by weight, or at least 35 parts by weight. And, the upper limit may be, for example, 39 parts by weight or less, 38 parts by weight or less, 37 parts by weight or less, 36 parts by weight or less, or 35 parts by weight or less. If it is less than the above content range, it is difficult to impart a low dielectric constant to the organic film for encapsulant. In addition, when the content exceeds the above range, since the photo-curing property is not good, it is not possible to sufficiently exhibit the protection function for the light emitting device provided by the organic film for the encapsulant.

In addition, within the above range, the composition is 60 parts by weight or more, 61 parts by weight or more, 62 parts by weight or more, 63 parts by weight or more, 64 parts by weight or more, 65 parts by weight or more, 66 parts by weight or more, 67 Above 70 parts by weight, above 68 parts by weight, above 69 parts by weight, above 70 parts by weight, above 71 parts by weight, above 72 parts by weight, above 73 parts by weight, above 74 parts by weight, above 75 parts by weight, above 76 parts by weight, 77 Weight part or more, 78 weight part or more, 79 weight part or more, 80 weight part or more, 81 weight part or more, 82 weight part or more, 83 weight part or more, 84 weight part or more, 85 weight part or more, 86 weight part or more, 87 It may include at least parts by weight, at least 88 parts by weight, at least 89 parts by weight, or at least 90 parts by weight. And, the upper limit is, for example, 94 parts by weight or less, 93 parts by weight or less, 92 parts by weight or less, 91 parts by weight or less, 90 parts by weight or less, 89 parts by weight or less, 88 parts by weight or less, 87 parts by weight or less, It may be 86 parts by weight or less or 85 parts by weight or less. When the content range is satisfied, the viscosity of the composition suitable for the inkjet process can be secured, and physical properties of the organic film for the encapsulant can be sufficiently secured by securing an appropriate curing speed.

In addition, within the above range, the composition is 0.5 parts by weight or more, 1 part by weight or more, 1.5 parts by weight or more, 2 parts by weight or more, 2.5 parts by weight or more, 3 parts by weight or more, 3.5 parts by weight or more, 4 parts by weight or more Or more, 4.5 parts by weight or more, or 5 parts by weight or more. Appropriate photo-curability can be ensured within the above range. In particular, when the content of the initiator is used in excess, the organic film for the encapsulant may lose transparency and turn yellow.

In one example, the composition may not include silicone-derived units. This is because when a silicon-derived unit is included, siloxane-based out-gas is generated under a high temperature condition, thereby damaging the light emitting device.

In addition to the above-mentioned composition, the composition may contain 1 part by weight or less of a separate additive. For example, it may further include a sensitizer for increasing the curing sensitivity, a polymerization inhibitor for increasing storage stability, or a surfactant for securing a stable coating property after inkjet printing.

In one example, the composition may be a composition that satisfies the moisture content of 20 ppm or less before curing. In general, since the light emitting device is susceptible to moisture, it is possible to adjust the moisture content before curing of the composition to 20 ppm or less through a moisture removal process for the composition of the composition, if necessary. The lower the water content in the composition, the better the tendency, so the lower limit is not particularly limited.

With regard to the inkjet process, the composition may have a viscosity suitable for the inkjet process, for example, a viscosity in the range of 1 to 50 cP at 25 ° C. Specifically, the lower limit of the viscosity of the composition may be 2 cP or more, 3 cP or more, 4 cP or more, 5 cP or more, 6 cP or more, 7 cP or more, 8 cP or more, 9 cP or more, or 10 cP or more, and The upper limit may be 20 cP or less, 19 cP or less, 18 cP or less, 17 cP or less, 16 cP or less, 15 cP or less, 14 cP or less, 13 cP or less, or 12 cP or less. When the above range is satisfied, appropriate coating properties and curing sensitivity can be secured. Measurement of viscosity can be made according to the method described in the experimental examples.

In one example, the composition may have a surface energy in the range of 20 to 40 mN / m, so that ejection from the inkjet head in the inkjet process is easy. For example, the upper limit is 39 mN / m or less, 38 mN / m or less, 37 mN / m or less, 36 mN / m or less, 35 mN / m or less, 34 mN / m or less, 33 mN / m or less, 32 mN / m or less, 31 mN / m or less, 30 mN / m or less, 29 mN / m or less, 28 mN / m or less, 27 mN / m or less, 26 mN / m or less or 25 mN / m or less, and The lower limit is 20.1 mN / m or more, 20.2 mN / m or more, 20.3 mN / m or more, 20.4 mN / m or more, 20.5 mN / m or more, 20.6 mN / m or more, 20.7 mN / m or more, 20.8 mN / m or more, 20.9 mN / m or more or 21.0 mN / m or more. Measurement of the surface energy can be made according to the method described in the experimental examples.

In another example related to the present application, the present application relates to an organic film for encapsulant. The organic film for the encapsulant may include a cured product of the composition described above.

In one example, the organic film for the encapsulant may have a dielectric constant of 3.3 or less. Specifically, when the organic film is formed on the metal layer on both sides, the dielectric constant measured according to the following experimental example may be 3.3 or less. At this time, the component forming the metal layer is not particularly limited, and may be, for example, Al or Ag. In addition, the thickness of the metal layer at the time of measuring the dielectric constant is not particularly limited, and may be, for example, within a range of 100 MPa or more to 5,000 MPa.

The dielectric constant of the mass produced in the prior art is in the range of about 3.4 or more and 4.5, and due to the parasitic capacitance between the electrodes, there is an unsuitable aspect to be used in a large display. However, the organic film for the encapsulant formed from the composition of the above-described composition may have a dielectric constant of 3.3 or less, 3.2 or less, 3.1 or less, 3.0 or less, 2.9 or less, or 2.8 or less. Accordingly, it is possible to improve the touch sensitivity of the touch sensor in the laminate or device described below. Since lowering the dielectric constant is advantageous for improving the sensitivity of the touch sensor, the lower limit of the dielectric constant is not particularly limited.

In one example, the organic film for the encapsulant may have a transmittance of 95% or more to visible light. Specifically, the visible light transmittance of the film may be 96% or more, 97% or more, 98% or more, or 99% or more, and an upper limit thereof may be less than 100% as about 100%. With respect to transmittance, visible light may mean light having a wavelength in the range of 380 nm to 780 nm, and more specifically light having a wavelength of 550 nm. As described below, the organic film for the encapsulant is located close to the organic light emitting element in the screen display device, and when the transmittance is satisfied, a clear visual sense can be provided to the user.

In one example, the thickness of the organic film for the encapsulant may be in the range of about 0.5 to 100 μm. Specifically, the upper limit may be 90 µm or less, 80 µm or less, 70 µm or less, 60 µm or less, 50 µm or less, 40 µm or less, 30 µm or less, or 20 µm or less, and the lower limit thereof, for example, 1 µm or more , 2 μm or more, 3 μm or more, 4 μm or more, or 5 μm or more.

The organic film for the encapsulant has excellent moisture / oxygen barrier properties as in the example described below, and has a low dielectric constant to increase the sensitivity of the touch sensor.

In another example of the present application, the present application relates to an encapsulant. Specifically, the encapsulant includes the organic film for the encapsulant and the inorganic layer described below, and may be located on one surface of the organic layer and / or the touch sensor of the organic light emitting device.

The encapsulant may have a structure in which the organic film for the encapsulant described above and the inorganic layer are stacked. The inorganic layer may include a metal component. For example, the inorganic layer may be a metal thin film.

In one example, the inorganic layer may include one or more metal oxides or nitrides selected from the group consisting of Al, Zr, Ti, Hf, Ta, In, Sn, Zn, Ce and Si. The inorganic layer may be formed by vapor deposition. At this time, the specific deposition process is not particularly limited. For example, when the inorganic layer includes a Si component, the inorganic layer may have a SiNx thin film or SiO ₂ thin film form.

In one example, the encapsulant may have a structure in which the organic film for the encapsulant and the inorganic layer are alternately stacked. For example, the encapsulant may include a laminated structure of an organic film / inorganic layer for encapsulant or may include a structure in which the laminated structure is repeated two or more times. Alternatively, the encapsulant may include a laminated structure of an organic film for sealing material / inorganic layer / organic film for encapsulant, or may include a laminated structure of an inorganic layer / organic film for sealing material / inorganic layer. When the inorganic layer and the organic layer are alternately stacked in the encapsulation, the number of these is not particularly limited, and the number of the inorganic layer and the organic layer included in the encapsulant may be the same or different.

In another example of the present application, the present application is a touch sensor; And an encapsulant located on one surface of the touch sensor. The encapsulant includes an organic film formed from the composition. Such a stacked structure may be referred to as a TOE (Touch On Encapsulation) structure. In the TOE structure, an encapsulant may be located on one surface of the touch sensor. In this structure, an organic film for an encapsulant having a low dielectric constant is required to increase touch sensitivity. Unless specifically described, in this application, the term "phase" or "phase" used in connection with the lamination position between structures is the third term between these configurations, as well as when one configuration is formed directly on top of another configuration. It may mean to include until the configuration is interposed.

The order in which the respective components of the laminate including the touch sensor and the encapsulant are stacked is not particularly limited. For example, the laminate may sequentially include a touch sensor, an organic film, and an inorganic layer, or may sequentially include a touch sensor, an inorganic layer, and an organic film. As mentioned above, the inorganic layer and the organic film may be alternately stacked when the encapsulant is constructed, and the number of these is not particularly limited, and the number of the inorganic layer and the organic layer included in the encapsulant is the same or different. You can.

The touch sensor refers to a device capable of recognizing input information obtained through contact with a user, and may be a sensor known in the related art. For example, the touch sensor may include a capacitive sensor that recognizes a touch based on static electricity generated in a user's body contact area (eg, a hand) and the resulting current change; Or it may be a pressure-sensitive sensor that recognizes a touch based on a change in capacitance generated when the conductive layer of the upper and lower plates of the touch sensor is contacted by the pressure applied by the user. The configuration of the sensor to recognize the user contact in each method may be known in the related art.

In one example, the touch sensor may include a conductive layer on one side or both sides. The material of the conductive layer is not particularly limited, and for example, a transparent conductive film such as ITO, a metal nanowire, or the like can be used.

The conductive layer may have a channel through which electricity flows and a non-channel region through which electricity does not flow. These regions may be formed through a method such as etching or photolithography.

In one example, the laminate may further include a cover substrate. Specifically, the laminate may sequentially include a cover substrate, a touch sensor, and the encapsulant. At this time, the cover substrate and the touch sensor may be collectively called a touch panel. The encapsulant is located on the touch panel to implement the TOE structure.

An adhesive layer or an adhesive layer having separate transparency may be positioned between the stacked structures. The type of the adhesive layer or the adhesive layer is not particularly limited, and for example, acrylic, silicone, urethane, or epoxy adhesives or adhesives may be used.

The cover substrate may have light transmittance, for example, when transmittance to visible light is 80% or more. In the case of having light transmittance, the kind of material included in the cover substrate is not particularly limited. For example, the cover substrate may include a polymer resin or a glass component.

In one example, when it is necessary to impart flexible properties, the cover substrate may include a polymer resin. Although not particularly limited, for example, the cover substrate may include, for example, a polyester film such as polycarbonate (PC), poly (ethylene naphthalate) (PEN) or poly (ethylene terephthalate) (PET); Acrylic film such as PMMA (poly (methyl methacrylate)), or polyolefin film such as PE (polyethylene) or PP (polypropylene); Polyimide film; Or a polyamide film.

In another example of the present application, the present application relates to a display device. The display device includes a touch sensor; And an encapsulant located on one side of the touch sensor. And it may include a light emitting device. Specifically, a touch sensor, an encapsulant, and a light emitting device may be sequentially included. At this time, the touch sensor side becomes the user's view side. The configuration of the touch sensor and the encapsulant may be the same as described above, and the light emitting device may be an organic light emitting device.

In one example, the touch sensor, the encapsulant, and the light emitting elements can be stacked in direct contact with each other.

In one example, the display device may sequentially include a touch sensor, an organic film for an encapsulant, an inorganic layer, and an organic light emitting device. In another example, the display device may sequentially include a touch sensor, an inorganic layer, an organic film for an encapsulant, and an organic light emitting device. In another example, the display device may include a structure in which an inorganic layer and an organic film for an encapsulant are alternately stacked two or more times between a touch sensor and an organic light emitting element. In this case, the number of the inorganic layer and the organic film is not particularly limited, and the number of the inorganic layer and the organic layer included in the encapsulant may be the same or different.

Organic light-emitting diodes (organic light-emiiting diode) is a self-emission device that emits light when a voltage is applied to an organic material. The time during which an electrical signal is converted into light is short and the light is non-directional and spreads uniformly. Have In addition, when an organic light emitting device is used, a backlight is not required, a viewing angle is excellent, and a high-speed response is possible, so that a display suitable for realizing a video can be manufactured. In addition, since a display thinner than an LCD or a PDP can be produced, and an organic material used for light emission has a flexible property, there is an advantage applicable to a flexible display.

The configuration of the organic light emitting device is not particularly limited, and may have a configuration known to those of ordinary skill in the related art. For example, a first electrode; A second electrode provided to face the first electrode; And one or more organic material layers provided between the first electrode and the second electrode. The organic material layer may be a light emitting layer. The organic material layer may have one or more layers. For example, it may include a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, and the like. The specific material (material) used in the above configurations is also not particularly limited, and materials known to those skilled in the related art may be used.

The organic light emitting device may further include a thin film transistor (TFT), a wiring, and the like on the opposite side to the user's view side of the display device.

In the display device, the position between the above-described light emitting element and the touch sensor, the organic film for the encapsulant of the above configuration or the encapsulant comprising the same can prevent damage to the adjacent configuration from external impact or moisture / oxygen. In addition, since the organic film for the encapsulant has a low dielectric constant, it is possible to improve the sensitivity of the touch sensor.

According to an example of the present application, an encapsulant that improves touch sensitivity of an adjacent touch sensor and provides excellent protection against an external environment may be provided.

1 schematically shows the use of an organic film for encapsulant according to an example of the present application. Specifically, Figure 1 schematically shows a cross-section of a laminate and a device comprising an organic film for the encapsulant of the present application. In Fig. 1, Encap. Ink means an organic film for the encapsulant, and SiN is an example of an inorganic layer configuration.
2 is a view for explaining the dielectric constant measurement process.

Hereinafter, the present application will be described in detail through examples. However, the protection scope of the present application is not limited by the examples described below.

Evaluation items and evaluation methods

* Dielectric constant (@ 100kHz): Dielectric constant was measured in the following order.

1. Deposition of Al onto the cleaned bare glass to 1500Å thickness as shown in Fig. 2 (using E-beam evaporator)

2. Formation of an organic film with a photocurable composition as in the Examples and Comparative Examples on the Al-deposited surface (after applying by inkjet method (Unijet UJ-200 inkjet printer), UV photocuring using a UV LED light source)

3. On the opposite side of the formed organic film, Al is deposited to a thickness of 1500Å

4.Measurement of capacitance value using impedance meter Agilent 4194A (10 ~ 1MHz)

5. Extract the capacitance value in the 100 kHz region and calculate the dielectric constant using the following equation

[formula]

The meaning of the characters in the above formula is as follows.

ε ₀ (= 8.854 x 10 ^-12 C / Vm, 8.854 x 10 ^-14 C / Vcm = 8.854 x 10 ^-12 F / m) dielectric constant

C = Cp Capacitance (F)

A (area mm ² ): π ²

d (thickness, um)

* Curing Sensitivity: Curing the compositions of Examples and Comparative Examples for the same time under the same conditions as described below, and confirming the tack free time for the cured product after the curing time has elapsed, that is, the time it takes until there is no sticky feeling Did. Long tack free time means poor curing sensitivity.

O: less than 1 second (substantially no tack time)

△: less than 1 minute

X: 5 minutes or more

* Transmittance after curing of the organic composition : Nippon denshoku COH-400 transmittance meter was used.

* Surface energy of organic composition (mN / m, 25 ° C ): Surface energy was measured according to the Ring method.

* Viscosity of organic composition (cP, 25 ° C ): The viscosity was measured using a Brookfield con & plate method.

Examples and comparative examples

Compositions of Examples and Comparative Examples were prepared with different contents as shown in Table 1 below. And, irradiated with 395 nm short wavelength UV light at room temperature (about 25 ℃) (UV LED light source was used, the light intensity during the total irradiation time is 1,400 mW / cm ² , the light amount is 1,000 mJ / cm ² ), The composition was cured to a thickness of 8 μm. Table 2 records the measured physical properties of the cured product.

[Table 1]

[Table 2]

From Table 1 and Table 2, it can be seen that the embodiment having the configuration according to the present application has excellent properties related to inkjet coating processability, curing sensitivity, transmittance after curing, dielectric constant, and black spot generation. However, in the case of Comparative Example 1, which does not contain the compound corresponding to Formula 1, the sensitivity of the touch sensor cannot be improved due to the high dielectric constant, and in the case of Comparative Example 2, which contains an excessive amount of the compound corresponding to Formula 1, sufficient curing is obtained. It can be seen that it does not happen. If sufficient hardening does not occur, it is impossible to provide the function of protecting the light emitting device in the original encapsulant. For reference, the dielectric constant of Comparative Example 2 was not measured because Al was not completely deposited on the organic film of Comparative Example 2 that was not sufficiently cured.

Claims (15)

A photocurable ink composition for encapsulants comprising a compound represented by Formula 1, a photocurable monomer, and an initiator:
[Formula 1]

In Chemical Formula 1, R1 is hydrogen or an alkyl group, Rf is a fluorinated alkyl group in which the number of carbon atoms of the alkyl group is in the range of 2 to 7, and all hydrogen of the alkyl group is substituted with fluorine. The photocurable ink composition for an encapsulant according to claim 1, wherein the photocurable monomer has a (meth) acrylate group or a vinyl group as a photocurable functional group. The photocurable ink composition for an encapsulant according to claim 2, comprising two or more types of photocurable monomers. The photocurable ink composition for encapsulants according to claim 1, wherein the photocurable monomer is a polyfunctional (meth) acrylate of mono alcohol or polyhydric alcohol. The photocurable ink composition for encapsulants according to claim 1, wherein the initiator is a triazine-based, acetophenone-based, benzophenone-based, thioxanthone-based, benzoin-based, phosphorus-based or oxime-based initiator. The photocurable ink composition for an encapsulant according to claim 1, comprising 5 to 40 parts by weight of the compound represented by Formula 1, 55 to 95 parts by weight of the photocurable monomer, and 0.1 to 10 parts by weight of the initiator. The photocurable ink composition for encapsulants according to claim 1, having a viscosity in the range of 1 to 50 cP at 25 ° C. The photocurable ink composition for encapsulants according to claim 1, wherein the surface energy is in the range of 20 to 40 mN / m. The photocurable ink composition for a sealing material according to claim 1, which does not contain a solvent. An organic film for an encapsulant containing a cured product of the composition according to claim 1 and having a dielectric constant of 3.3 or less when metal layers are formed on both sides. The organic film for encapsulants according to claim 10, wherein the transmittance to visible light is 95% or more. The organic film for sealing materials according to claim 10; And an inorganic layer comprising a metal. 13. The encapsulant of claim 12, wherein the inorganic layer comprises one or more oxides or nitrides selected from the group consisting of Al, Zr, Ti, Hf, Ta, In, Sn, Zn, Ce and Si. Touch sensor; And a sealing material positioned on one surface of the touch sensor and comprising the encapsulant according to claim 12. Touch sensor; An encapsulant located on one side of the touch sensor and having the organic film for encapsulant according to claim 10; And a light emitting element.

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