WO2019109618A1

WO2019109618A1 - Optical film, ito film, and touch-control screen and method for fabricating optical film

Info

Publication number: WO2019109618A1
Application number: PCT/CN2018/091440
Authority: WO
Inventors: 徐金龙; 尹晓峰; 陈庆松
Original assignee: 张家港康得新光电材料有限公司
Priority date: 2017-12-04
Filing date: 2018-06-15
Publication date: 2019-06-13

Abstract

The present invention provides an optical film, an indium tin oxide (ITO) film, and a touch-control screen and a method for fabricating an optical film; said optical film contains a first hardened layer and a transparent substrate layer; said transparent substrate layer contains a first optical surface and a second optical surface; said first hardened layer is arranged on the first optical surface of the transparent substrate layer; the first hardened layer contains two or more refractive index materials; no apparent delamination is present in the first hardened layer; such a design effectively prevents interference fringes in the first hardened layer as a result of the stratification of different refractive indexes; in combination with the progressively decreasing distributed arrangement of refractive indexes in the technical solution, a particularly good anti-reflective effect is produced, the purpose of which is to eliminate the etch marks that appear after subsequent ITO etching.

Description

Optical film, ITO film, and method for preparing touch screen and optical film

Technical field

The invention relates to the field of optical films, and in particular to an optical film, an ITO film and a structure of a touch screen and a method for preparing the optical film.

Background technique

Prior art TWI527063B is in a conductive transparent laminate. Patterning the transparent conductive layer of the conductive transparent laminate to obtain a patterned conductive transparent laminate, and reflecting color and reflectance of the reflected light emitted from the pattern portion of the patterned conductive transparent laminate and the non-pattern The difference between the reflected color and the reflectance of the reflected light emitted by the portion is small, and when applied to the touch panel, the user can hardly see the trace of the transparent conductive layer patterning during viewing, and the transparent substrate is passed through a transparent substrate; The adjustment layer is disposed on the transparent substrate, the first optical adjustment layer has a refractive index ranging from 1.65 to 1.83, and the physical thickness ranges from 25 nm to 35 nm; and a second optical adjustment layer is disposed on the first optical adjustment layer. The second optical adjustment layer has a refractive index ranging from 1.33 to 1.52 and a physical thickness ranging from 20 nm to 40 nm; a transparent conductive layer disposed on the second optical adjustment layer, the technical substrate layer, the first optical adjustment layer, and The optical adjustment layer has a clear stratification phenomenon and a clear thickness. Therefore, due to the obvious boundary between the layers, the stepwise refractive index difference between the layers is too large to be avoided. Etched disappearance of the interference pattern appears.

Summary of the invention

An object of the present invention is to provide an optical film, an ITO film, and a method for preparing a touch screen and an optical film, which are effectively prevented from being in the first hardened layer by designing the first hardened layer to be free from significant delamination. The interference pattern generated by the layering, on the other hand, provides a touch screen including the above-mentioned optical film.

To achieve the above object, the technical solution of the present invention includes:

An optical film comprising a first hardened layer and a transparent substrate layer, the transparent substrate comprising a first optical surface and a second optical surface, the first hardened layer being disposed on the first optical surface of the transparent substrate layer, There is at least two kinds of refractive indices in a hardened layer, and there is no obvious delamination in the first hardened layer. The non-layering phenomenon means that two layers overlap, but there is actually no interface; There is no interface on the surface; the cross section (the cross section is liquid nitrogen frozen section) does not observe the interface under scanning electron microscopy, or can barely see the unclear interface. Alternatively, the non-layering phenomenon may be a theoretically existing transition layer spontaneously generated by interpenetrating between high and low refractive index materials, or may be a refractive index gradual and continuous distribution, or may be two irregular refractive indices. Doping profile. This design effectively avoids interference fringes caused by different refractive index delamination in the first hardened layer.

Further, the refractive index of the first hardened layer decreases from the end away from the transparent substrate layer toward the end adjacent to the transparent substrate layer, and the word decrement means that the refractive index in the hardened layer may be a gentle stepwise decrease, which may be The slow penetration of mutual penetration, or a continuous change in the depth direction. This technical solution effectively avoids the cliff-like difference in refractive index in the first hardened layer, which is detrimental to the elimination of the etched pattern, and the refractive index decreasing distribution is set to eliminate the visibility of the etched pattern produced by the later ITO etching.

Further, the first hardened layer contains nanoparticles in the range of 10-100 nm, and the role of the nanoparticles is to adjust the refractive index of the hardened layer.

Further, the nanoparticles are selected from one or more of the group consisting of silica indium oxide, tin oxide, zinc oxide, titanium oxide, zirconium oxide, aluminum oxide, and cerium oxide.

Further, the first hardened layer includes a hardened layer M and a hardened layer N.

Further, an anti-blocking hardened layer is disposed on the second optical surface of the transparent substrate layer.

Further, a second hard surface of the transparent substrate layer is provided with a second hardened layer that is mirror-symmetrical to the first optical surface.

Further, there is significant delamination between the first hardened layer and the first optical surface of the transparent substrate layer.

Further, there is no obvious delamination between the first hardened layer and the first optical surface of the transparent substrate layer, which is advantageous for eliminating interference fringes.

Further, the hardened layer M has a refractive index ranging from 1.45 to 1.70, and the hardened layer N has a refractive index ranging from 1.50 to 2.0.

Further, the hardened layer M is used to contain a urethane (meth) acrylate composition.

Further, the hardened layer N is used to contain a urethane (meth) acrylate composition.

Further, the raw material forming the hardened layer contains a solvent having permeability or solubility to the transparent base material layer.

Further, a raw material forming the hardened layer M and the hardened layer N contains a solvent and a resin which can be fused to each other.

Further, the thickness of the first hardened layer ranges from 10 to 10000 nm.

Further, the transparent substrate layer is selected from the group consisting of PI, COP, PET, PVC, PMMA, PC, GFUP, FEP, PVF, SI.

Further, the solvent is selected from one or more of an alcohol, a ketone, an ether, an ester, and an amide, and the alcohol is methanol, ethanol, propanol, butanol, isobutanol, tert-butanol, ethoxyethanol, and butyl. Oxyethanol, benzyl alcohol or phenylethyl alcohol; ketone selected from ketone is ethyl ketone, acetone, methyl ethyl ketone, methyl isobutyl ketone or cyclohexanone; ether selected from ether is dibutyl ether, propylene glycol methyl ether, propylene glycol Ether acetate or propylene glycol diethyl ether acetate; the ester selected from the ester is ethyl acetate, butyl acetate, ethyl lactate, methyl acetoacetate or methyl acetoacetate; the hydrocarbon is toluene or xylene; the amide is N, N-dimethylformamide, N,N-dimethylacetamide or N-methylpyridinone.

Further, the optical film comprises a transparent substrate layer and a first hardened layer, the transparent substrate comprises a first optical surface and a second optical surface, the first hardened layer is disposed on the first optical surface of the transparent substrate layer, the first hardening The refractive index of the layer decreases from the end remote from the transparent substrate layer toward the end adjacent to the transparent substrate layer, the first hardened layer comprises the hardened layer M and the hardened layer N, and there is no significant difference between the hardened layer M and the hardened layer N a layer, a solvent or a resin containing a mutual permeability or solubility between the material forming the hardened layer M and the hardened layer, the solvent being one or more of propylene glycol methyl ether, methyl isobutyl ketone, ethyl acetate The resin is a urethane (meth) acrylate type composition, the hardened layer M contains silica having a particle diameter of 80 to 110 nm, and the hardened layer N contains zirconia having a particle diameter of 5 to 20 nm.

Further, the second optical surface of the transparent substrate layer is provided with a second hardened layer, and preferably the second hardened layer is mirror-symmetrical to the first hardened layer.

Further, there is no significant delamination between the second hardened layer and the transparent substrate layer.

Further, the second hardened layer contains two or more kinds of refractive index materials.

Further, the second hardened layer has a refractive index ranging from 1.45 to 2.0.

Further, the raw material forming the second hardened layer contains a solvent having permeability or solubility to the transparent base material layer.

Further, the above solvent is selected from one or more of an alcohol, a ketone, an ether, an ester, and an amide. Preferably, the alcohol is methanol, ethanol, propanol, butanol, isobutanol, tert-butanol, ethoxylate. Ethanol, butoxyethanol, benzyl alcohol or phenylethyl alcohol; preferably, the ketone is ethyl ketone, acetone, methyl ethyl ketone, methyl isobutyl ketone or cyclohexanone; preferably, the ether is dibutyl ether, propylene glycol methyl ether, propylene glycol Methyl ether acetate or propylene glycol diethyl ether acetate; preferably, the ester is ethyl acetate, butyl acetate, ethyl lactate, methyl acetoacetate or methyl acetoacetate; preferably, the hydrocarbon is toluene or xylene; preferably, The amide is N,N-dimethylformamide, N,N-dimethylacetamide or N-methylpyridinone.

Further, a part of at least two kinds of refractive index materials in the first hardened layer are in contact with each other and penetrate each other on a surface contacting each other.

Further, a part of at least two kinds of refractive index materials in the second hardened layer are in contact with each other and penetrate each other on a surface contacting each other.

Further, the thickness of the second hardened layer is selected from the range of 10 to 150,000 nm.

According to another aspect of the present application, there is also provided an ITO film comprising the above optical film.

According to still another aspect of the present application, there is also provided a method of preparing the optical film comprising the above,

The hard coating liquid is applied to the first optical surface of the transparent substrate layer by a roll-to-roll coating method, and the oven temperature is respectively set in the range of 30-100 ° C, and the UV energy is set at 300-600 mJ/cm 2 . A hardened layer is obtained.

Beneficial effects:

The invention provides an optical film, wherein the first hardened layer has at least two kinds of refractive indexes, and the first hardened layer has no obvious layering phenomenon, and the design effectively avoids interference due to delamination in the first hardened layer. Pattern. The refractive index decreasing distribution setting of this technical solution can obtain an excellent anti-reflection effect, and the purpose thereof is to eliminate the etching pattern which occurs after the late ITO etching.

DRAWINGS

The accompanying drawings, which are incorporated in the claims of the claims In the drawing:

1 is a schematic structural view of an optical film provided by an exemplary embodiment 1 of the present invention;

2 is a schematic structural view of an optical film according to an exemplary embodiment 4 of the present invention;

3 is a schematic view showing the structure of an optical film provided in Comparative Example 1;

4 is a cross-sectional view showing a SEM scanning electron microscope liquid nitrogen section of an optical film according to an exemplary embodiment 1 of the present invention;

Figure 5 is a cross-sectional view showing a SEM scanning electron microscope liquid nitrogen section of an optical film section provided in Comparative Example 1.

Wherein, the above figures include the following reference numerals:

1. A transparent substrate layer; 2. a first hardened layer; 3. a second hardened layer.

Detailed ways

In order to make the objects, technical solutions and advantages of the present invention more comprehensible, the invention will be further described in detail below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

As shown in FIG. 1, the present invention provides an optical film 100 comprising a transparent substrate layer 1 and a first hardened layer 2, the transparent substrate layer 1 comprising a first optical surface and a second optical surface, the first hardened layer 2 being disposed On the first optical surface of the transparent substrate layer 1, the first hardened layer 2 contains two or more kinds of refractive index materials, and the first hardened layer 2 does not have a phenomenon of significant delamination.

The first hardened layer 2 of the above optical film has at least two kinds of refractive indexes, and the first hardened layer 2 does not have a phenomenon of significant delamination, and the design effectively avoids interference fringes in the first hardened layer 2 due to delamination. This technical solution and the refractive index decreasing distribution arrangement can obtain an excellent anti-reflection effect, and the purpose is to eliminate the etching pattern which occurs after the late ITO etching.

The above phenomenon in which there is no significant stratification means that the two layers overlap, but there is actually no interface; it is judged that there is no interface on both faces according to the refractive index; the cross section (the cross section is liquid nitrogen frozen slice) No interface was observed under the scanning electron microscope, or the interface was barely visible. Alternatively, the phenomenon that there is no significant stratification may be a theoretically existing transition layer spontaneously generated by interpenetrating between high and low refractive index materials, or may be a refractive index gradual and continuous distribution, or may be two refractive indices. Irregular doping profile.

In an embodiment of the present application, the refractive index of the first hardened layer 2 decreases from an end remote from the transparent substrate layer 1 toward an end near the transparent substrate layer 1. The purpose of the first hardened layer without significant delamination is achieved by the above-described decreasing of the refractive index. The meaning of the above decrement means that the refractive index in the hardened layer may be a gentle stepwise decrease, either a slow decrease in mutual penetration or a continuous change in the depth direction. This technical solution can effectively avoid the defects which are disadvantageous to the etching pattern elimination caused by the cliff-type difference of the refractive index in the first hardened layer.

The refractive index change of the first hardened layer 2 described above is achieved by doping nanoparticles having different refractive indices, and it is preferable that the first hardened layer 2 contains nanoparticles having a particle diameter of 5 to 120 nm. Preferably, the above nanoparticles are selected from one or more of the group consisting of silica, indium oxide, tin oxide, zinc oxide, titanium oxide, zirconium oxide, aluminum oxide, and cerium oxide.

Further, in order to further reduce the generation of interference fringes, it is preferable that there is no significant delamination between the first hardened layer 2 and the first optical surface of the transparent substrate layer 1.

In an embodiment of the present application, the first hardened layer 2 includes a hardened layer M and a hardened layer N, the hardened layer M has a refractive index ranging from 1.45 to 1.70, and the hardened layer N has a refractive index ranging from 1.50 to 2.0. The difference in refractive index between the hardened layer M and the hardened layer N is small, so that the delamination between each other is not obvious, and the object of reducing the interference pattern caused by the delamination is realized by a simple structure. At the time of production, the corresponding refractive index material is coated and then cured, and there is no significant delamination between the hardened layer M and the hardened layer N after curing, and the SEM scanning electron microscope liquid nitrogen section cross-sectional view shows a one-layer structure.

There are a plurality of substances capable of satisfying the above refractive index range, and in order to better satisfy the hardness requirement, the first hardened layer 2 includes a hardened layer M and a hardened layer N, and the hardened layer M contains a urethane (meth) acrylate composition. Preferably, the hardened layer N is a composition containing a urethane (meth) acrylate.

In another embodiment of the present application, the raw material forming the first hardened layer 2 contains a solvent having permeability or solubility to the transparent base material layer 1. By using a solvent having permeability or solubility to the transparent substrate layer 1 during the formation of the first hardened layer 2, there is no significant delamination between the finally formed first hardened layer 2 and the transparent substrate layer 1. phenomenon.

In another embodiment of the present application, the first hardened layer 2 includes a hardened layer M and a hardened layer N, and the raw material forming the hardened layer M and the hardened layer N contains a solvent and/or a resin which can be fused to each other. Similarly, in the process of forming the hardened layer M and the hardened layer N, a solvent and/or a resin which can be fused to each other are used, so that resins or refractive materials having different refractive indexes can be fused to each other, thereby effectively avoiding the hardened layer M and the hardened layer. The stratification between N.

In order to further achieve a good refractive index and structural stability, it is preferred that the first hardened layer 2 has a thickness ranging from 10 to 150,000 nm.

The material of the transparent substrate layer 1 used in the present application may be selected from the transparent substrate materials commonly used in optical films in the prior art. Preferably, the transparent substrate layer 1 is selected from the group consisting of PI, COP, PET, PVC, PMMA, PC. , GFUP, FEP, PVF, SI.

In a preferred embodiment of the present application, the first hardened layer 2 comprises two or more kinds of refractive index materials, and the first hardened layer 2 comprises a hardened layer M and a hardened layer N, a hardened layer M and a hardened layer N. There is no obvious stratification between the hardened layer M and the hardened layer N. The solvent and/or resin are mutually permeable or soluble. The solvent is one of propylene glycol methyl ether, methyl isobutyl ketone and ethyl acetate. The resin is a urethane (meth) acrylate type composition, the hardened layer M contains silica particles having a particle diameter of 80 to 110 nm, and the hardened layer N contains nanoparticles having a particle diameter of 5 to 20 nm.

In order to increase the physical hardness of the optical film, it is preferable that the second optical surface of the transparent base material layer 1 is provided with the second hardened layer 3, and it is preferable that the second hardened layer is mirror-symmetrical to the first hardened layer 2. The mirror symmetry of the present application is mirror symmetrical with respect to the structure of the first hardened layer 2 and the second hardened layer of the transparent substrate layer 1, and the symmetrical structural composition is the same, that is, the refractive index is mirror symmetrical.

Further, in order to further reduce the generation of interference fringes, there is no significant delamination between the second hardened layer 3 and the transparent substrate layer 1.

In order to optimize the optical performance of the second hardened layer 3, it is preferable that the second hardened layer 3 contains two or more kinds of refractive index materials. The delamination of the second hardened layer 3 is reduced by the selection of the refractive index material.

Further, in order to further satisfy the requirements of optical performance, it is preferred that the second hardened layer 3 has a refractive index ranging from 1.45 to 2.0.

In order to avoid delamination between the second hardened layer 3 and the transparent base material layer 1, it is preferred that the raw material forming the second hardened layer 3 contains a solvent having permeability or solubility to the transparent base material layer 1.

The solvent described above has various options. Preferably, the solvent is selected from one or more of an alcohol, a ketone, an ether, an ester, and an amide. Preferably, the alcohol is methanol, ethanol, propanol, butanol, isobutanol. , tert-butanol, ethoxyethanol, butoxyethanol, benzyl alcohol or phenylethyl alcohol; preferably, the ketone is ethyl ketone, acetone, methyl ethyl ketone, methyl isobutyl ketone or cyclohexanone; preferably, the ether is two Butyl ether, propylene glycol methyl ether, propylene glycol methyl ether acetate or propylene glycol diethyl ether acetate; preferably, the ester is ethyl acetate, butyl acetate, ethyl lactate, methyl acetoacetate or methyl acetoacetate; preferably, the hydrocarbon is Toluene or xylene; preferably, the amide is N,N-dimethylformamide, N,N-dimethylacetamide or N-methylpyridinone.

In an embodiment of the present application, a part of at least two kinds of refractive index materials in the first hardened layer 2 are in contact with each other and penetrate each other on a surface contacting each other. It is preferable that a part of at least two kinds of refractive index materials in the second hardened layer 3 are in contact with each other and penetrate each other on a surface in contact with each other.

In order to further achieve a good refractive index and structural stability of the optical film, it is preferred that the thickness of the second hardened layer 3 is selected from the range of 10 to 150,000 nm.

In another exemplary embodiment of the present application, there is provided an ITO film comprising the optical film 100 of any of the above. Since the optical film of the present application effectively avoids interference fringes in the first hardened layer due to delamination, the etched lines appearing after the late ITO etching are eliminated.

In still another exemplary embodiment of the present application, a touch screen is provided, the touch screen comprising an ITO film as described above. Since the ITO film of the present application does not have an etched pattern, the sensitivity and optical effect of the touch panel having the same can be significantly improved.

There are various implementations of the above optical film, and those skilled in the art can adjust the corresponding preparation method according to the refractive index material or solvent used.

In the present application, the hard coating liquid is applied to the first optical surface of the transparent substrate layer by a roll-to-roll coating method, and the oven temperature is set in the range of 30 to 100 ° C, respectively, and the UV energy is set at 300 ～. 600 mJ/cm ² to obtain a hardened layer.

When the hardened layer comprises the hardened layers M, N, the preparation method is adopted: the following steps are included:

S1, the hard coating liquid M is applied to the first optical surface of the transparent substrate by a roll-to-roll coating method, and the oven temperature is respectively set in the range of 30-100 ° C, and the UV energy is set at 300-600 mJ/ Cm ² , obtaining a hardened layer M;

S2, the hard coating liquid N is applied to the hardened layer M of the transparent substrate by a roll-to-roll coating method, and the oven temperature is respectively set in the range of 30-100 ° C, and the UV energy is set at 300-600 mJ/cm. ² , obtaining a hardened layer N.

Example 1

As shown in FIG. 1, the optical film 100 includes a transparent substrate layer 1 including a first optical surface and a second optical surface, and a first optical layer 2, and the first hardened layer 2 is disposed on the transparent substrate layer 1. On the first optical surface, the first hardened layer 2 contains two or more kinds of refractive index materials, and the first hardened layer 2 does not have a phenomenon of significant delamination.

Specifically, the first hardened layer 2 has a thickness ranging from 10 to 100,000 nm, preferably from 10 to 40,000 nm.

Specifically, the transparent substrate layer 1 is selected from one of PI, COP, PET, PVC, PMMA, PC, GFUP, FEP, PVF, and SI, and preferably COP.

A method for preparing a specific optical film: applying a hardening liquid M by a roll-to-roll method on a first optical surface of the transparent substrate layer 1 at a temperature of 30-45 ° C, 55-75 ° C, 80- Baking at 95 ° C, 90-70 ° C four-section oven, UV energy is set to 400-600 mJ / cm ² , to obtain a hardened layer M with a thickness of 3000 nm, the hardening liquid N is coated on the hardened layer M by the same process, due to The hardening liquid M and the hardening liquid N contain a solvent and a resin which can be fused to each other, so that the hardened layer M and the hardened layer N of the product 1 do not have significant delamination, and the ITO layer is sputtered on the side of the hardened layer N away from the transparent substrate layer.

The specific hardened layer M has a refractive index ranging from 1.45 to 1.70 urethane (meth) acrylate composition, preferably having a refractive index of 1.49 - 1.50, a hardened layer M containing 10-100 nm of nanoparticles, and a refractive index range of the hardened layer N. The 1.50-2.0 polyurethane (meth) acrylate composition has a refractive index of 1.65, and the hardened layer N contains 10-100 nm of nanoparticles.

The specific nanoparticles are selected from one or more of silicon dioxide, indium oxide, tin oxide, zinc oxide, titanium oxide, zirconium oxide, aluminum oxide, and antimony oxide. Preferably, the hardened layer M is 100 nm. Silicon, hardened layer N is 10 nm zirconia.

Specifically, the hardened layer M and the hardened layer N contain a solvent which can be fused to each other, and the solvent is selected from one or more of an alcohol, a ketone, an ether, an ester, and an amide, and the alcohol is methanol or ethanol. Propyl alcohol, butanol, isobutanol, tert-butanol, ethoxyethanol, butoxyethanol, benzyl alcohol or phenylethyl alcohol; the ketone is ethyl ketone, acetone, methyl ethyl ketone, methyl isobutyl ketone or cyclohexanone; The ether is dibutyl ether, propylene glycol methyl ether, propylene glycol methyl ether acetate or propylene glycol diethyl ether acetate; the ester is ethyl acetate, butyl acetate, ethyl lactate, methyl acetoacetate or methyl acetoacetate; Toluene or xylene; amide is N,N-dimethylformamide, N,N-dimethylacetamide or N-methylpyridinone, preferably: propylene glycol methyl ether, methyl isobutyl ketone, acetic acid One or more of the esters.

In the optical film corresponding to the data in the table, the hardened layer M is a polyurethane (meth) acrylate composition having a refractive index of 1.49, the hardened layer M contains 100 nm of silica nanoparticles, and has a thickness of 3000 nm; the hardened layer N is A urethane (meth) acrylate composition having a refractive index of 1.50, and a hardened layer N containing 10 nm of zirconia nanoparticles having a thickness of 3000 nm. The coating liquid forming the hardened layer M and the hardened layer N contains a solvent propylene glycol methyl ether acetate which can be fused to each other such that there is no significant delamination between the hardened layer M and the hardened layer N, see SEM shown in FIG. Scanning electron microscopy section of liquid nitrogen section.

Example 2

On the basis of Example 1, there is no significant delamination of the first optical surface of the first hardened layer 2 and the transparent substrate layer 1. Wherein, the coating liquid of the first hardened layer 2 contains solvent toluene having permeability or solubility to the transparent substrate layer 1, so that the first optical surface of the first hardened layer 2 and the transparent substrate layer 1 does not have obvious Layered.

Example 3

On the basis of Example 1, there is a significant delamination of the first optical surface of the first hardened layer 2 and the transparent substrate layer 1. Among them, the solvent of the coating liquid of the first hardened layer 2 does not have permeability or solubility to the transparent substrate layer 1, so that the first optical surface of the first hardened layer 2 and the transparent substrate layer 1 has significant delamination.

Example 4

As shown in FIG. 2, in an optical film 100 provided on the basis of Embodiment 2, a second hard surface of the transparent substrate layer 1 is provided with a second hardened layer 3 which is mirror-symmetrical to the first optical surface, There is no significant delamination between the hardened layer 2 and the second hardened layer 3 and the transparent substrate layer 1, respectively.

The specific first hardened layer 2 and second hardened layer 3 respectively contain two or more kinds of refractive index materials.

The thickness of the specific first hardened layer 2 and the second hardened layer 3 is selected from the range of 10 to 150,000 nm, preferably 10 to 40,000 nm.

The specific transparent substrate layer 1 is selected from one of PI, COP, PET, PVC, PMMA, PC, GFUP, FEP, PVF, and SI, and preferably COP.

The specific first hardened layer 2 has a refractive index ranging from 1.45 to 1.70 urethane (meth) acrylate composition, preferably having a refractive index of 1.49 - 1.50, and the first hardened layer 2 contains 10-100 nm of nanoparticles, and the second hardening The refractive index of layer 3 ranges from 1.50 to 2.0 urethane (meth) acrylate composition, preferably has a refractive index of 1.70, and the second hardened layer 3 contains 10 to 100 nm of nanoparticles.

The specific first hardened layer 2 and the second hardened layer 3 contain a solvent which can be fused to each other, and the solvent is selected from one or more of an alcohol, a ketone, an ether, an ester, and an amide, and the alcohol is methanol, ethanol, or propanol. , butanol, isobutanol, tert-butanol, ethoxyethanol, butoxyethanol, benzyl alcohol or phenylethyl alcohol; the ketone is ethyl ketone, acetone, methyl ethyl ketone, methyl isobutyl ketone or cyclohexanone; Dibutyl ether, propylene glycol methyl ether, propylene glycol methyl ether acetate or propylene glycol ethyl ether acetate; the ester is ethyl acetate, butyl acetate, ethyl lactate, methyl acetoacetate or methyl acetoacetate; the hydrocarbon is toluene or xylene; The amide is N,N-dimethylformamide, N,N-dimethylacetamide or N-methylpyridinone, preferably: propylene glycol methyl ether, methyl isobutyl ketone, ethyl acetate One or more.

In the optical film corresponding to the data in the table, the second hardened layer 3 is a urethane (meth) acrylate composition having a refractive index of 1.70, and the second hardened layer 3 contains 10 nm of nanoparticles having a thickness of 3000 nm; The raw materials of the layer 2 and the second hardened layer 3 contain a solvent propylene glycol methyl ether acetate which can be fused to each other.

Example 5

The difference from Embodiment 2 is that the first hardened layer 2 comprises a plurality of (more than two) refractive index hardened layers, and there is no significant delamination between the plurality of refractive index hardened layers, away from the transparent substrate layer. The one end is stepped down toward the end close to the transparent substrate layer, and the refractive indices of the plurality of refractive index layers are respectively 1.70, 1.67, 1.64, 1.50 (the refractive index of each refractive index layer is also irregularly randomized. ).

Example 6

The difference from Embodiment 2 is that the first hardened layer 2 comprises a plurality of (more than two) refractive index hardened layers, and there is no significant delamination between the plurality of refractive index hardened layers, away from the transparent substrate layer. The end of the end is successively decreased toward the end of the transparent substrate layer, and the refractive indices of the plurality of refractive index layers are respectively 1.70, 1.69, 1.68, 1.50 (reduced refractive index is moderated).

Example 7

The difference from Embodiment 2 is that the first hardened layer 2 comprises a plurality of (more than two) refractive index hardened layers, and there is no significant delamination between the plurality of refractive index hardened layers, away from the transparent substrate layer. The one end is reduced toward the end close to the transparent substrate layer, and the refractive indices of the plurality of refractive index layers are respectively 1.70, 1.65, 1.64, 1.63, 1.62, 1.61, 1.60, 1.50 (the refractive index has a large span at both ends, and the middle is moderated).

Example 8

The difference from Embodiment 2 is that the first hardened layer 2 comprises a plurality of (more than two) refractive index hardened layers, and there is no significant delamination between the plurality of refractive index hardened layers, away from the transparent substrate layer. That end is reduced toward the end near the transparent substrate layer, the high refractive index layer 1.70, the refractive index relaxation transition layer 1.70 and 1.50 (the refractive index relaxation transition layer means that the two refractive index layers are doped together), and the low refractive index layer 1.50.

Comparative example 1

As shown in FIG. 3, an optical film 300 includes a transparent substrate layer 1, a first hardened layer 2, and a second hardened layer 3. The transparent substrate layer 1 includes a first optical surface and a second optical surface, and is first hardened. The layer 2 is disposed on the first optical surface, the second hardened layer 3 is disposed on the first hardened layer 2, the transparent substrate layer 1 is COP, the refractive index of the first hardened layer 2 is 1.49, and the refractive index of the second hardened layer 3 The ratio is 1.65, the first hardened layer 2 contains 100 nm of silicon dioxide, the second hardened layer 3 contains 10 nm of zirconia, the first hardened layer 2 has a thickness of 3000 nm, and the second hardened layer 3 has a thickness of 70 nm. The structure of the optical film obtained is different from that of the embodiment 1 in that, according to Fig. 5, it can be seen that there is a distinct delamination between the transparent substrate layer 1, the first hardened layer 2 and the second hardened layer 3, respectively.

The haze and the transmittance were measured by the NDH2000N haze meter; the reflectance was measured by a 2084 spectrophotometer; the reflectance difference = the reflectance after the ITO was sputtered by the optical film - the reflectance of the optical film, the above Examples 1-8 and the comparative examples The optical effects of 1 are shown in the table below:

Example 9

The difference from Embodiment 4 is that the first hardened layer 2 comprises a plurality of (more than two) refractive index hardening layers, and there is no significant delamination between the plurality of refractive index hardening layers, and the hardening points in contact The layers are mutually infiltrated, stepwise decreasing from the end remote from the transparent substrate layer toward the end adjacent to the transparent substrate layer, and the refractive indices of the plurality of refractive index layers are respectively 1.70, 1.67, 1.64, 1.50 (each refractive index layer) The equal difference distribution may also be irregularly randomized, and the second hardened layer 3 is mirror-symmetrical to the first hardened layer 2.

Example 10

The difference from Embodiment 4 is that the first hardened layer 2 comprises a plurality of (more than two) refractive index hardened layers, and there is no significant delamination between the plurality of refractive index hardened layers, and the hardened layered layers in contact with each other The permeation decreases continuously from the end away from the transparent substrate layer to the end adjacent to the transparent substrate layer, and the refractive indices of the plurality of refractive index layers are 1.70, 1.69, 1.68, 1.50, respectively (relatively decreasing the refractive index), The second hardened layer 3 is mirror-symmetrical to the first hardened layer 2.

Example 11

The difference from Embodiment 4 is that the first hardened layer 2 comprises a plurality of (more than two) refractive index hardened layers, and there is no significant delamination between the plurality of refractive index hardened layers, and the hardened layered layers in contact with each other The penetration is reduced from the end away from the transparent substrate layer toward the end adjacent to the transparent substrate layer, and the refractive indices of the plurality of refractive index layers are respectively 1.70, 1.65, 1.64, 1.63, 1.62, 1.61, 1.60, 1.50 (refraction) The ratio of the two ends is large, the middle is moderated, and the second hardened layer 3 is mirror-symmetrical to the first hardened layer 2.

Example 12

The difference from Embodiment 2 is that the first hardened layer 2 comprises a plurality of (more than two) refractive index hardened layers, and there is no significant delamination between the plurality of refractive index hardened layers, and the hardened layered layers in contact with each other Permeation decreases from the end remote from the transparent substrate layer toward the end adjacent to the transparent substrate layer, the high refractive index layer 1.70, the refractive index relaxation transition layer 1.70 and 1.50 (the refractive index relaxation transition layer refers to the two refractive index layer doping Mixed with), the low refractive index layer 1.50, the second hardened layer 3 is mirror symmetrical with the first hardened layer 2.

The optical effects of the above Examples 4, 9-12 and Comparative Example 1 are shown in the following table:

	实施例4Example 4	实施例9Example 9	实施例10Example 10	实施例11Example 11	实施例12Example 12	对比例1Comparative example 1
透过率Transmission rate	90.890.8	9090	90.590.5	90.890.8	8989	9090
雾度Haze	0.360.36	0.340.34	0.340.34	0.360.36	0.400.40	0.460.46
反射率Reflectivity	9％9%	7％7%	6％6%	9％9%	9％9%	9％9%
反射率差Poor reflectance	0.6％0.6%	0.5％0.5%	0.5％0.5%	0.6％0.6%	0.7％0.7%	1.2％1.2%

It can be seen from the above table that the refractive index decreasing distribution arrangement gives the optical film an excellent anti-reflection effect.

Example 13

The difference from Example 1 is that the hardened layer M contains silica particles having a particle diameter of 80 nm, and the hardened layer N contains zirconium oxide particles having a particle diameter of 5 nm.

Example 14

The difference from Example 1 is that the hardened layer M contains silica particles having a particle diameter of 110 nm, and the hardened layer N contains zirconium oxide particles having a particle diameter of 20 nm.

Example 15

The difference from Example 1 is that the hardened layer M contains silica particles having a particle diameter of 120 nm, and the hardened layer N contains zirconium oxide particles having a particle diameter of 30 nm.

Example 16

The difference from Example 1 is that the hardened layer M contains silica particles having a particle diameter of 100 nm, and the hardened layer N contains titanium oxide particles having a particle diameter of 10 nm.

Example 17

The difference from Example 1 is that the hardened layer M has a thickness of 100,000 nm and the hardened layer N has a thickness of 50,000 nm.

Example 18

The difference from Example 1 is that the thickness of the hardened layer M is 50,000 nm and the thickness of the hardened layer N is 50,000 nm.

Example 19

The difference from Example 1 is that the thickness of the hardened layer M is 300 nm and the thickness of the hardened layer N is 10 nm.

The optical effects of the above Examples 13-19 and Comparative Example 1 are shown in the following table:

The above description is only the preferred embodiment of the invention, and the invention is not limited thereto, and modifications, equivalent substitutions and improvements made within the spirit and scope of the invention are included in the scope of the invention. It is intended that the present invention be construed as being limited by the scope of the invention.

Claims

An optical film (100) comprising a transparent substrate layer (1) and a first hardened layer (2), the transparent substrate layer (1) comprising a first optical surface and a second optical The first hardened layer (2) is disposed on the first optical surface of the transparent substrate layer (1), wherein the first hardened layer (2) comprises two or more types. The refractive index material, the first hardened layer (2) does not have a phenomenon of significant delamination.
The optical film (100) according to claim 1, wherein a refractive index of the first hardened layer (2) is from an end far from the transparent substrate layer (1) toward the transparent substrate layer One end of (1) is decremented.
The optical film (100) according to claim 1, wherein the first hardened layer (2) comprises nanoparticles having a particle diameter of 5 to 120 nm.
The optical film (100) according to claim 3, wherein the nanoparticles are selected from the group consisting of silica, indium oxide, tin oxide, zinc oxide, titanium oxide, zirconium oxide, aluminum oxide, and cerium oxide. One or more.
The optical film according to claim 1, characterized in that there is no significant delamination between the first hardened layer (2) and the first optical surface of the transparent substrate layer (1).
The optical film according to claim 1, wherein the first hardened layer (2) comprises a hardened layer M and a hardened layer N, and the hardened layer M has a refractive index ranging from 1.45 to 1.70, the hardened layer The refractive index of N ranges from 1.50 to 2.0.
The optical film according to claim 1, wherein the first hardened layer (2) comprises a hardened layer M and a hardened layer N, and the hardened layer M is used to contain a urethane (meth) acrylate composition.
The optical film according to claim 1, wherein the first hardened layer (2) comprises a hardened layer M and a hardened layer N, and the hardened layer N is a composition containing a urethane (meth)acrylate.
The optical film according to claim 1, wherein the raw material forming the first hardened layer (2) contains a solvent having permeability or solubility to the transparent base material layer.
The optical film according to claim 1, wherein the first hardened layer (2) comprises a hardened layer M and a hardened layer N, and the raw materials forming the hardened layer M and the hardened layer N contain each other A solvent and/or resin that fuses with each other.
The optical film according to claim 1, wherein the first hardened layer (2) has a thickness in the range of 10 to 150,000 nm.
The optical film according to claim 1, wherein the transparent substrate layer (1) is selected from the group consisting of PI, COP, PET, PVC, PMMA, PC, GFUP, FEP, PVF, SI.
The optical film according to claim 1, wherein the first hardened layer (2) comprises two or more kinds of refractive index materials, and the first hardened layer (2) comprises a hardened layer M and hardened The layer N, the hardened layer M and the hardened layer N do not have significant delamination, and the solvent forming the hardened layer M and the hardened layer N contains mutually impregnable or soluble solvents and/or Or a resin, wherein the solvent is one or more of propylene glycol methyl ether, methyl isobutyl ketone, and ethyl acetate, and the resin is a urethane (meth) acrylate type composition, and the hardened layer M contains Silica particles having a particle diameter of 80 to 110 nm, and the hardened layer N contains nanoparticles having a particle diameter of 5 to 20 nm.
The optical film according to claim 1, wherein a second hard surface (3) is disposed on the second optical surface of the transparent substrate layer (1), preferably the second hardened layer and the first A hardened layer (2) is mirror symmetrical.
Optical film according to claim 14, characterized in that there is no significant delamination between the second hardened layer (3) and the transparent substrate layer (1).
The optical film according to claim 14, wherein the second hardened layer (3) has a refractive index ranging from 1.45 to 2.0.
The optical film according to claim 14, wherein the raw material forming the second hardened layer (3) contains a solvent having permeability or solubility to the transparent base material layer.
The optical film according to claim 9, 10 or 17, wherein the solvent is one or more selected from the group consisting of an alcohol, a ketone, an ether, an ester, and an amide. Preferably, the alcohol is methanol or ethanol. , propanol, butanol, isobutanol, tert-butanol, ethoxyethanol, butoxyethanol, benzyl alcohol or phenylethyl alcohol; preferably, the ketone is ethyl ketone, acetone, methyl ethyl ketone, methyl butyl ketone a ketone or cyclohexanone; preferably, the ether is dibutyl ether, propylene glycol methyl ether, propylene glycol methyl ether acetate or propylene glycol diethyl ether acetate; preferably, the ester is ethyl acetate, butyl acetate, ethyl lactate Methyl acetoacetate or methyl acetoacetate; preferably, the hydrocarbon is toluene or xylene; preferably, the amide is N,N-dimethylformamide, N,N-dimethylacetamide or N-methylpyridinone.
The optical film according to claim 1, characterized in that a part of at least two kinds of refractive index materials in the first hardened layer (2) are in contact with each other and penetrate each other on a face contacting each other.
The optical film according to claim 14, wherein a part of at least two kinds of refractive index materials in the second hardened layer (3) are in contact with each other and penetrate each other on a face contacting each other.
The optical film according to claim 14, wherein the second hardened layer (3) has a thickness ranging from 10 to 150,000 nm.
An ITO film comprising the optical film (100) according to any one of claims 1 to 21.
A touch screen comprising the ITO film according to claim 22.
A method of preparing an optical film according to any one of claims 1 to 21, characterized in that the preparation method comprises:

The hardened layer coating liquid is applied to the first optical surface of the transparent substrate layer by a roll-to-roll coating method, and the oven temperature is set in the range of 30 to 100 ° C, respectively, and the UV energy is set at 300 to 600 mJ/cm. 2 to obtain a hardened layer.