A light-regulating encapsulation composition for OLEDs, an encapsulation film and a method for preparing the same

Abstract

The present application discloses a kind of light adjusting encapsulation composition for OLED, encapsulation film and its preparation method, the light adjusting encapsulation composition includes light curable glue composition and scattering particle;The scattering particle is 1~10wt% of the total weight of light adjusting encapsulation composition, and the refractive index difference between the light curable glue composition and scattering particle is less than 0.2.The present application can form light adjusting encapsulation film with light scattering function by dispersing polysiloxane microsphere with average particle size of 0.1~2 μm in light curable glue composition, and when the refractive index of polysiloxane microsphere is less than the refractive index of light curable glue composition, the encapsulation film prepared by light adjusting encapsulation composition is simple in manufacturing process, mainly applicable to top emitting OLED light emitting device, solves the light deviation of OLED due to different observation angles, and improves light diffusion effect.

Description

Technical Field

[0001] This invention belongs to the field of optical thin film technology, specifically relating to a light-modulating encapsulation composition for OLEDs, an encapsulation film, and a method for preparing the same. Background Technology

[0002] Organic light-emitting diodes (OLEDs) are rapidly gaining popularity as a next-generation display technology due to their advantages such as active light emission, good temperature characteristics, low power consumption, fast response, flexibility, ultra-thinness, and low cost. OLEDs can be classified into three types according to the direction of light emission: bottom-emitting OLEDs, top-emitting OLEDs, and bifacial emitting OLEDs. Top-emitting OLEDs, where light is emitted from the top of the device, can improve device efficiency, narrow the spectrum, and enhance color purity. However, this can cause the electroluminescence spectrum of the OLED to change with the viewing angle, resulting in color deviation due to different viewing angles. Therefore, a light-adjusting film can be introduced into the thin-film encapsulation layer to adjust this color deviation.

[0003] Traditional light-modulating films are made by adding inorganic scattering particles with different refractive indices to a transparent substrate and coating them onto a substrate using methods such as inkjet printing. After photocuring, the light-modulating film is obtained. Common inorganic particles include SiO2, TiO2, Al2O3, CaCO3, and BaSO4. Their disadvantages are high refractive index and high density, which can lead to poor transparency and poor diffusion effect in the light-modulating film.

[0004] The main technical parameters of light-modulating films include transmittance and haze. Transmittance represents the overall utilization rate of incident light by the light-modulating film, while haze represents the degree to which incident light deviates from its original incident direction. Therefore, transmittance and haze characterize the degree of diffusion of incident light introduced by the light-modulating film. However, for light-modulating films based on inorganic or organic particles, an increase in haze will inevitably lead to a decrease in transmittance. In addition, due to the low viscosity of the prepared photocurable composition, the organic / inorganic particle photocurable composition has poor dispersion and agglomeration, thus affecting the light dispersion effect.

[0005] In view of this, the inventors provide a light-modulating encapsulation composition for OLEDs, an encapsulation film, and a method for preparing the same, to overcome the deficiencies of the prior art. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a light-modulating encapsulation composition, encapsulation film and preparation method for OLEDs, so as to solve the problem that light deviation occurs due to different observation angles when OLEDs emit light from the top, affecting light efficiency and light diffusion effect.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] On one hand, the present invention provides a light-modulating encapsulation composition for OLEDs, comprising a photocurable adhesive composition and scattering particles; wherein the scattering particles account for 1 to 10 wt% of the total weight of the light-modulating encapsulation composition, and the refractive index of the scattering particles is less than the refractive index of the photocurable adhesive composition.

[0009] Furthermore, the refractive index difference between the photocurable adhesive composition and the scattering particles is less than 0.2.

[0010] Preferably, the refractive index of the scattering particles is 1.3 to 1.45.

[0011] Preferably, the refractive index of the light-curable adhesive composition is 1.45 to 1.55.

[0012] Furthermore, the scattering particles are polymer particles, preferably polysiloxane microspheres, and the average particle size of the polysiloxane microspheres is 0.1 to 2 μm.

[0013] When visible light emitted from an organic light-emitting diode (OLED) is incident on scattering particles, the particle size needs to be between 0.1 and 2 μm. This not only improves the luminous efficacy but also enhances the light diffusion effect. This is because when the particle size is less than 0.1 μm, light generally does not scatter and may be completely internally emitted, thus failing to effectively improve luminous efficacy. However, when the particle size of the scattering material is greater than 2 μm, this particle size is similar to the thickness of the organic layer, making it difficult to disperse the scattering particles. Furthermore, due to the low viscosity of photocurable adhesive compositions, excessively large particle sizes cannot be stably stored due to gravity.

[0014] Furthermore, the refractive index of the scattering material is chosen to be between 1.3 and 1.45. This is because when the refractive index of the scattering material is less than 1.3, the transparency of the cured light-modulating encapsulation composition is poor, while when the refractive index is greater than 1.45, its light diffusion effect is poor. The light emitted from the organic light-emitting diode will pass through the polysiloxane microspheres and be refracted inside them, concentrating the light, thus making the diffusion effect through the particle center poor.

[0015] Furthermore, the refractive index of the photocurable adhesive composition of the present invention is between 1.45 and 1.55, and the difference in refractive index between the photocurable adhesive composition and the scattering particles is less than 0.2. This is because when the difference in refractive index between the photocurable adhesive composition and the scattering particles is less than 0.2, the scattering angle of light incident on the scattering particles is small, and scattering will occur to a greater extent, thereby improving the light diffusion effect. However, when the difference in refractive index between the two is greater than 0.2, that is, the refractive index of the scattering particles is too small, the light transmittance of the photocurable adhesive composition after curing is poor.

[0016] Furthermore, the photocurable adhesive composition comprises, by weight, 10-40 parts of monofunctional photocurable monomer, 20-50 parts of difunctional photocurable monomer, 2-10 parts of polyfunctional photocurable monomer, and 0.5-8 parts of photoinitiator.

[0017] Furthermore, the monofunctional photocurable monomer, difunctional photocurable monomer, and polyfunctional photocurable monomer are all selected from (meth)acrylates.

[0018] Furthermore, the monofunctional photocurable monomer is selected from compounds having an alicyclic or aromatic group and containing a (meth)acrylate in its molecular structure. Specifically, it is at least one of polyethylene glycol o-phenylphenyl ether acrylate, 2-(m-tolyloxy)acrylate, 2-(3-methoxyphenoxy)acrylate, dicyclopentenyl ethoxyacrylate, dicyclopentenyl acrylate, 2-(2-naphthyloxy)ethyl methacrylate, o-phenylphenoxyethyl (meth)acrylate, 2-(p-isopropylphenyl-phenoxy)-ethyl acrylate, or isobornyl (meth)acrylate.

[0019] Furthermore, the bifunctional photocurable monomer is selected from di(meth)acrylates containing C6 to C15 alkylene groups, specifically from at least one of 1,6-hexanediol di(meth)acrylate, 1,8-octanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, 1,10-decanediol di(meth)acrylate, 1,11-undecanediol di(meth)acrylate, or 1,12-dodecanediol di(meth)acrylate.

[0020] Furthermore, the multifunctional photocurable monomer is selected from one or more of trimethylolpropane triacrylate, dimethylolpropane tetraacrylate, pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, or dipentaerythritol hexaacrylate.

[0021] Furthermore, the photoinitiator is a free radical initiator. Specifically, the free radical initiator is at least one of triazine-based, acetophenone-based, benzophenone-based, thioxanone-based, benzoin-based, phosphorus-based, or oxime-based photoinitiators.

[0022] Preferably, the photoinitiator used in this invention is a phosphorus-based photoinitiator, specifically one or more of diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, benzyl(diphenyl)phosphine oxide, or bis(2,6-dimethoxybenzoyl)(2,4,4-trimethylpentyl)phosphine oxide.

[0023] A second aspect of the present invention provides an encapsulation film that can be used as follows: Figure 1 In the organic light-emitting diode display device shown, the encapsulation film includes a first inorganic layer, an organic layer, and a second inorganic layer. The organic layer is located between the first inorganic layer and the second inorganic layer. The organic layer is obtained by photocuring the above-mentioned light-modulating encapsulation composition. The thickness of the organic layer is 3 to 25 μm. The first and second inorganic layers are any one of metal oxides, metal nitrides, or metal sulfides. The total thickness of the first and second inorganic layers is 100 to 300 nm.

[0024] Furthermore, the encapsulation film may include multiple alternating organic and inorganic layers.

[0025] A third aspect of the present invention also provides a method for preparing an encapsulation film, comprising the following specific steps:

[0026] Step 1: Preparation of the light-modified encapsulation composition: Add the above-mentioned light-curable adhesive composition and scattering particles to a light-proof bottle, mix evenly, and filter to obtain the light-modified encapsulation composition. The viscosity of this composition at 25°C is 15-30 cps, and the surface tension is 15-38 mN / m, thus meeting the requirements of inkjet printing.

[0027] Step 2, Preparation of the inorganic layer: The inorganic layer material is coated onto the surface of the object to be encapsulated using CVD (chemical vapor deposition) technology to form an inorganic layer;

[0028] Step 3: Preparation of the organic layer: The light-modulating encapsulation composition obtained in Step 1 is coated onto the surface of the inorganic layer prepared in Step 2 using inkjet printing, and then coated with 10mW / cm 2 ~70mW / cm 2 It is cured by irradiation with ultraviolet light for 10 to 100 seconds to form an organic layer;

[0029] Step 4: Preparation of the encapsulation film: The surface to be encapsulated is deposited and coated in an alternating manner of inorganic layer-organic layer-inorganic layer, with the outermost layer being an inorganic layer. The final inorganic-organic-inorganic layer deposited and coated on the surface of the object to be encapsulated is the encapsulation film.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The light-modulating encapsulation composition of the present invention uses scattering particles with a particle size of 0.1μm to 2μm and a refractive index of 1.3 to 1.45, which are mixed and compounded with a light-curable adhesive composition with a refractive index lower than that of light. The light efficiency of the cured light-modulating encapsulation composition is improved and the light diffusion effect is enhanced.

[0032] 2. In this invention, polysiloxane microspheres are dispersed in a photocurable adhesive composition. The polysiloxane microspheres can be uniformly dispersed in the system and are integrated without phase separation or the formation of pores or cracks. The cured light-modulated encapsulation composition has high haze and high transparency, and has excellent light diffusion effect.

[0033] 3. The present invention utilizes mono(meth)acrylates with alicyclic or aromatic groups, di(meth)acrylates containing C6 to C15 alkylene groups, and polyfunctional (meth)acrylates to achieve synergistic effects, which can effectively reduce water vapor transmission rate and improve the light transmittance and haze of the encapsulation film. At the same time, the light-modulating encapsulation composition has high stability.

[0034] 4. The polysiloxane microspheres used in this invention are dispersed in a photocurable adhesive composition to form a light-modulating encapsulation film with light scattering function. The manufacturing process of the encapsulation film is simple and it is mainly suitable for top-emitting OLED light-emitting devices. It solves the problem of light deviation caused by different viewing angles in OLEDs and has excellent light diffusion effect. Attached Figure Description

[0035] The accompanying drawings are incorporated in and form part of this specification, and together with the description serve to explain the principles of the invention.

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a cross-sectional view of an organic light-emitting diode (OLED) display device;

[0038] Figure 2 This is a diagram of light reflection from incident light onto scattering particles;

[0039] Figure 3 This is a diagram showing the light diffusion effect in the organic layer.

[0040] Wherein: 10 is the substrate; 20 is the organic light-emitting diode; 31 is the first inorganic layer; 32 is the organic layer; 33 is the second inorganic layer; 30 is the encapsulation film; and 40 is the scattering particles. Detailed Implementation

[0041] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses consistent with some aspects of the invention as detailed in the appended claims.

[0042] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0043] Example 1

[0044] This embodiment provides a light-modulating encapsulation composition for OLEDs, the raw materials of which include a light-curable adhesive composition and scattering particles, the scattering particles accounting for 7% of the total weight of the light-modulating encapsulation composition.

[0045] Specifically, in this embodiment, the scattering particles are polysiloxane microspheres with a refractive index of 1.430 and an average particle size of 1 μm, purchased from Changxing Chemical Materials (Zhuhai) Co., Ltd.

[0046] In this embodiment, the photocurable adhesive composition includes 20 parts of monofunctional photocurable monomer, 30 parts of difunctional photocurable monomer, 8 parts of multifunctional photocurable monomer, and 3 parts of photoinitiator.

[0047] Specifically, the monofunctional photocurable monomer is dicyclopentenyl ethoxyacrylate (CAS No.: 65983-31-5); the difunctional photocurable monomer is 1,12-dodecanediol di(meth)acrylate (CAS No.: 72829-09-5); the polyfunctional photocurable monomer is pentaerythritol tetraacrylate (CAS No.: 4986-89-4); and the photoinitiator is photoinitiator TPO (CAS No.: 75980-60-8).

[0048] This embodiment also provides a method for preparing a light-modulated encapsulation composition. The specific steps are as follows: add the monofunctional photocurable monomer, difunctional photocurable monomer, multifunctional photocurable monomer, photoinitiator and scattering particles in the above proportions into a light-proof bottle, mix evenly, filter, and obtain the light-modulated encapsulation composition.

[0049] The photocurable adhesive composition prepared in this embodiment has a viscosity of 23.4 cps, a surface tension of 29.1 mN / m, and a refractive index of 1.512.

[0050] UV curing process: 25℃, 30mW / cm 2 The curing time is 60 seconds, and the center wavelength of the curing light intensity is 395 nm.

[0051] Example 2

[0052] This embodiment provides a light-modulating encapsulation composition for OLEDs, the raw materials of which include a light-curable adhesive composition and scattering particles, the scattering particles accounting for 3% of the total weight of the light-modulating encapsulation composition.

[0053] Specifically, in this embodiment, the scattering particles are polysiloxane microspheres with a refractive index of 1.430 and an average particle size of 1 μm, purchased from Changxing Chemical Materials (Zhuhai) Co., Ltd.

[0054] In this embodiment, the photocurable adhesive composition includes 40 parts of monofunctional photocurable monomer, 50 parts of difunctional photocurable monomer, 3 parts of polyfunctional photocurable monomer, and 5 parts of photoinitiator.

[0055] Specifically, the monofunctional photocurable monomer is o-phenylphenoxyethyl acrylate (CAS No.: 91442-24-9); the difunctional photocurable monomer is 1,12-dodecanediol di(meth)acrylate (CAS No.: 72829-09-5); the polyfunctional photocurable monomer is pentaerythritol tetraacrylate (CAS No.: 4986-89-4); and the photoinitiator is photoinitiator TPO (CAS No.: 75980-60-8).

[0056] This embodiment also provides a method for preparing a light-modulated encapsulation composition. The specific steps are as follows: add the monofunctional photocurable monomer, difunctional photocurable monomer, multifunctional photocurable monomer, photoinitiator and scattering particles in the above proportions into a light-proof bottle, mix evenly, filter, and obtain the light-modulated encapsulation composition.

[0057] The photocurable adhesive composition prepared in this embodiment has a viscosity of 20.1 cps, a surface tension of 27.4 mN / m, and a refractive index of 1.503.

[0058] UV curing process: 25℃, 30mW / cm 2 The curing time is 60 seconds, and the center wavelength of the curing light intensity is 395 nm.

[0059] Example 3

[0060] This embodiment provides a light-modulating encapsulation composition for OLEDs, the raw materials of which include a light-curable adhesive composition and scattering particles, the scattering particles accounting for 10% of the total weight of the light-modulating encapsulation composition.

[0061] Specifically, in this embodiment, the scattering particles are polysiloxane microspheres with a refractive index of 1.430 and an average particle size of 2 μm, purchased from Changxing Chemical Materials (Zhuhai) Co., Ltd.

[0062] In this embodiment, the photocurable adhesive composition includes 10 parts of monofunctional photocurable monomer, 25 parts of difunctional photocurable monomer, 2 parts of polyfunctional photocurable monomer, and 1 part of photoinitiator.

[0063] Specifically, the monofunctional photocurable monomer is o-phenylphenoxyethyl acrylate (CAS No.: 91442-24-9); the difunctional photocurable monomer is 1,12-dodecanediol di(meth)acrylate (CAS No.: 72829-09-5); the polyfunctional photocurable monomer is pentaerythritol tetraacrylate (CAS No.: 4986-89-4); and the photoinitiator is photoinitiator TPO (CAS No.: 75980-60-8).

[0064] This embodiment also provides a method for preparing a light-modulated encapsulation composition. The specific steps are as follows: add the monofunctional photocurable monomer, difunctional photocurable monomer, multifunctional photocurable monomer, photoinitiator and scattering particles in the above proportions into a light-proof bottle, mix evenly, filter, and obtain the light-modulated encapsulation composition.

[0065] The photocurable adhesive composition prepared in this embodiment has a viscosity of 24.8 cps, a surface tension of 28.1 mN / m, and a refractive index of 1.514.

[0066] UV curing process: 25℃, 30mW / cm 2 The curing time is 60 seconds, and the center wavelength of the curing light intensity is 395 nm.

[0067] Comparative Example 1

[0068] The specific implementation of Comparative Example 1 is the same as that of Example 1, except that the scattering particles in Comparative Example 1 are titanium dioxide with a refractive index of 2.6 and an average particle size of 1 μm, which were purchased from Ningbo Jiwei Nano New Materials Technology Co., Ltd.

[0069] Comparative Example 2

[0070] The specific implementation of Comparative Example 2 is the same as that of Example 1, except that no monofunctional photocurable monomer was added in Comparative Example 2.

[0071] Comparative Example 3

[0072] The specific implementation of Comparative Example 3 is the same as that of Example 1, except that no bifunctional photocurable monomer was added in Comparative Example 3.

[0073] Comparative Example 4

[0074] The specific implementation of Comparative Example 4 is the same as that of Example 1, except that no multifunctional photocurable monomer was added in Comparative Example 4.

[0075] Performance testing:

[0076] (1) Water vapor transmission rate: The water vapor transmission rate was measured using a water vapor transmission rate tester (PERMATRAN-W3 / 33, manufactured by MOCON) at 85°C and 85% relative humidity for 24 hours.

[0077] (2) Stability: The light-modulating encapsulation compositions prepared in Examples 1-3 and Comparative Examples 1-2 were placed into colorimetric tubes of the same specifications. 3 mL of liquid was taken from a position 5 mm below the liquid surface on days 0 and 3, respectively, and the weight ratio of 3 mL of liquid placed for 3 days to that placed for 0 days was calculated to characterize the stability of the system.

[0078] (3) Transmittance: The transmittance of the cured light-modulated encapsulation composition in the 600nm visible light range was measured by ultraviolet spectrophotometer.

[0079] (4) Haze: The haze of the cured light-modulating encapsulation composition at a wavelength of 600 nm was measured by a haze meter, wherein the thickness of the cured light-modulating encapsulation composition was 18 μm.

[0080] The performance test results are shown in Table 1 below.

[0081] Table 1

[0082]

[0083] As shown in Table 1, in Examples 1-3, the light-modulated encapsulation composition is a mixture of a photocurable adhesive composition and scattering particles. The scattering particles are polysiloxane microspheres with a designed refractive index, and the refractive index difference between the scattering particles and the photocurable adhesive composition is less than 0.2. Simultaneously, when the photocurable adhesive composition is a mixture of monofunctional, difunctional, and multifunctional photocurable monomers and a photoinitiator in a predetermined proportion, the water vapor transmission rate of the final encapsulation film is less than 4.5 g / m². 2• After 24 hours, the stability was greater than 0.9, the transmittance was greater than 90%, and the haze was greater than 10. Conversely, in Comparative Example 1, when the scattering particles were titanium dioxide with a refractive index of 2.6, or in Comparative Examples 2 to 4, when no monofunctional, difunctional, or multifunctional photocurable monomers were added to the photocurable adhesive composition, the water vapor transmittance, stability, transmittance, and haze data were all poor, making it difficult to use in OLEDs.

[0084] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention.

[0085] It should be understood that the present invention is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A light-modulating encapsulation composition for OLEDs, characterized in that, It includes a photocurable adhesive composition and scattering particles; the scattering particles account for 1 to 10 wt% of the total weight of the photo-modulated encapsulation composition, and the refractive index of the scattering particles is less than that of the photocurable adhesive composition; The refractive index of the scattering particles is 1.3 to 1.45, the refractive index of the photocurable adhesive composition is 1.45 to 1.55, and the refractive index difference between the photocurable adhesive composition and the scattering particles is less than 0.2; the scattering particles are polysiloxane microspheres with an average particle size of 0.1 to 2 μm. The photocurable adhesive composition comprises, by weight, 10-40 parts of monofunctional photocurable monomer, 20-50 parts of difunctional photocurable monomer, 2-10 parts of polyfunctional photocurable monomer, and 0.5-8 parts of photoinitiator, wherein the monofunctional, difunctional, and polyfunctional photocurable monomers are all selected from (meth)acrylates. The monofunctional photocurable monomer is selected from compounds having an alicyclic or aromatic group and having a (meth)acrylate in its molecular structure; The bifunctional photocurable monomer is selected from di(meth)acrylates containing C6 to C15 alkylene groups.

2. The light-modulating encapsulation composition for OLED according to claim 1, characterized in that, The monofunctional photocurable monomer is at least one of polyethylene glycol o-phenylphenyl ether acrylate, 2-(m-tolyloxy) ethyl acrylate, 2-(3-methoxyphenoxy) ethyl acrylate, dicyclopentenyl ethoxyacrylate, dicyclopentenyl acrylate, 2-(2-naphthyloxy)ethyl methacrylate, o-phenylphenoxy ethyl (meth) acrylate, 2-(p-isopropylphenyl-phenoxy)-ethyl acrylate, or isobornyl (meth) acrylate.

3. An encapsulation film, characterized in that, It includes a first inorganic layer (31), an organic layer (32), and a second inorganic layer (33). The organic layer (32) is located between the first inorganic layer (31) and the second inorganic layer (33). The organic layer (32) is obtained by photocuring the light-modulated encapsulation composition according to claim 1 or 2. The thickness of the organic layer (32) is 3 to 25 μm, and the total thickness of the first inorganic layer (31) and the second inorganic layer (33) is 100 to 300 nm.

4. A method for preparing the encapsulation film according to claim 3, characterized in that, The specific steps include the following: Step 1: Preparation of the light-modulating encapsulation composition: Add the light-curable adhesive composition according to claim 1 or 2 and the scattering particles into a light-proof bottle, mix evenly, and filter to obtain the light-modulating encapsulation composition. Step 2, Preparation of the inorganic layer: The inorganic layer material is coated onto the surface of the object to be encapsulated using chemical vapor deposition technology to form an inorganic layer; Step 3: Preparation of the organic layer: The light-modulating encapsulation composition obtained in Step 1 is coated onto the surface of the inorganic layer prepared in Step 2 using inkjet printing, and then coated with 10mW / cm 2 ~70mW / cm 2 It is cured by irradiation with ultraviolet light for 10 to 100 seconds to form an organic layer; Step 4: Preparation of the encapsulation film: The surface to be encapsulated is deposited and coated in an alternating manner of inorganic layer-organic layer-inorganic layer, with the outermost layer being an inorganic layer. The final inorganic layer-organic layer-inorganic layer deposited and coated on the surface of the object to be encapsulated is the encapsulation film. The water vapor transmission rate of the encapsulation film is less than 4.5 g / m. 2 • After 24 hours, the stability is greater than 0.9, the light transmittance is greater than 90%, and the haze is greater than 10.

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