WO2018111054A9

WO2018111054A9 - Composition for forming optical film, optical film and polarizing plate comprising same

Info

Publication number: WO2018111054A9
Application number: PCT/KR2017/014953
Authority: WO
Inventors: 서정현; 장영래; 박진영; 이한나
Original assignee: 주식회사 엘지화학
Priority date: 2016-12-16
Filing date: 2017-12-18
Publication date: 2018-10-18
Also published as: WO2018111054A2; WO2018111054A3

Abstract

The present invention relates to a composition for forming an optical film, an optical film, and a polarizing plate, in which the composition for forming an optical film improves adhesion between an antiglare layer and a light-transmitting base film and enables the antiglare layer and the optical film to exhibit excellent optical characteristics such as appropriate haze, low glossiness, and excellent antiglare properties. The composition for forming an optical film is a resin composition for forming an optical film for forming an infiltration layer and an antiglare layer having surface irregularities on a light-transmitting base film, and comprises: a binder-forming compound comprising a multifunctional (meth)acrylate-based compound having three or more functional groups, and a permeable compound having a hydrophilic functional group and a photo-curable functional group; two or more light-transmitting fine particles having a sub-micron (sub-㎛) scale; and a permeable solvent capable of dissolving at least a part of the light-transmitting base film, wherein the binder-forming compound and the permeable solvent have a weight ratio of 1:0.04 or more.

Description

[Name of invention]

Composition for forming optical film, optical film and polarizing plate comprising same

Technical Field

Cross citation with related application (s)

This application claims the benefit of priority based on Korean Patent Application No. 10-2016-0173016 dated December 16, 2016 and Korean Patent Application No. 10-2016—0173548 dated December 15, 2017. All content disclosed in the literature is included as part of this specification.

The present invention improves the adhesion between the anti-glare layer and the light-transmissive base film, the composition for forming an optical film, optical to enable the anti-glare layer and the optical film to exhibit excellent optical properties such as appropriate haze, low gloss and excellent anti-glare properties It relates to a film and a polarizing plate.

Background Art

In an image display device such as an organic electroluminescent element (OELD) or a liquid crystal display element (LCD), it is required to prevent a decrease in contrast and a decrease in visibility due to reflection or reflection of external light. To this end, optical laminated films such as antireflection films are formed on the surface of an image display device in order to reduce image reflection, reflection, and the like by scattering light or optical interference.

For example, in a liquid crystal display element etc., the optical laminated film containing an anti-glare layer has been generally formed before. The anti-glare layer mainly includes a binder and fine particles contained in the binder, and the fine particles are usually formed to partially protrude on the surface of the binder. That is, as the antiglare layer has surface irregularities due to the fine particles protruding from the binder surface, the anti-glare layer can control light scattering / reflection and the like to suppress the visibility deterioration of the image display device.

By the way, since the optical film which has an anti-glare layer as mentioned above is normally formed in the outermost surface of an image display apparatus, and controls light scattering / light reflection, etc., the impact is often applied from the exterior, and for this reason, an anti-glare layer and a base film Excellent physical properties such as adhesion and hardness are required.

However, in the case of the previously known optical film, the adhesiveness and hardness were often insufficient depending on the type of the base film and the binder. Also, these

Alternative Site (Article 26) If you wish to ensure the adhesion or hardness by changing the kind of the binder or the like, rather than the optical properties such as anti-glare layer is reduced, light was ^"likelihood not include an anti-glare properties to control the light scattering / reflecting, such as not correctly expressed.

[Detailed Description of the Invention]

[Technical problem]

Accordingly, the present invention provides a composition for forming an optical film, which improves the adhesion between the antiglare layer and the transparent base film, and enables the antiglare layer and the optical film to exhibit excellent optical properties such as appropriate haze, low gloss and excellent antiglare properties. To provide.

This invention also provides the optical film which shows the outstanding optical characteristic with the improved adhesiveness between an anti-glare layer and a base film.

Moreover, this invention provides the polarizing plate containing an optical film.

[Technical solution]

The present invention is a resin composition for forming an optical film for forming an antiglare layer having an erosion layer and surface irregularities on a light-transmissive base film,

Compound for binder formation containing the trifunctional or more than trifunctional (meth) acrylate type compound, and the permeable compound which has a hydrophilic functional group and a photocurable functional group; Two or more light transmitting fine particles having a sub-micron scale; And a permeable solvent capable of dissolving at least a portion of the light transmissive base film,

The binder-forming compound: The permeable solvent has a weight ratio of 1: 0.04 or more, and the resin composition for forming an optical film, wherein the permeable solvent is contained in an amount of 1 to 4.5 parts by weight based on 100 parts by weight of the total resin composition for forming an optical film. to provide,

The present invention also provides a light-transmissive base film;

An erosion layer formed by being eroded in the light transmissive base film so as to overlap at least a portion of the light transmissive base film, and including a first binder including a first (meth) acrylate-based crosslinked polymer; And

A second binder comprising a second (meth) acrylate-based crosslinked polymer, and at least two kinds having a sub-micron scale dispersed on the second binder

2 Alternative paper (Article 26) An antiglare layer comprising translucent fine particles, the antiglare layer having surface irregularities on the light transmissive base film and the erosion layer;

The erosion layer has a thickness of 100 nm or more,

It provides an optical film having a total haze of the antiglare layer of 1 to 5% and a 60 ^° glossiness of 75% to 90%.

In addition, the present invention provides a polarizing plate comprising the optical film. Hereinafter, a composition for forming an optical film, an optical film, and a polarizing plate including the same according to a specific embodiment of the present invention will be described.

As used herein, micro () scale refers to having a particle size or particle size of less than 1 mm, i.e., less than 10Q0, and nano (nm) scale refers to less than 1 βϊΆ, i.e., less than 1000 nm. Refers to having a particle size or particle diameter, and sub-micron scale refers to having a particle size or particle size on the micron scale or the nano scale.

In addition, a photopolymerizable compound is collectively called a compound which causes crosslinking, hardening, or polymerization reaction when light is irradiated, for example, when visible light or ultraviolet light is irradiated. In addition, (meth) acryl [(meth) acryl] is meant to include both acryl and methacryl.

In addition, (co) polymer is meant to include both co-polymers and homo-polymers.

In addition, the permeable compound has a hydrophilic functional group, for example, a hydroxyl group or an alkoxy group, etc. in the structure, or is relatively small in molecular weight, so that it is easy to move in the solution, so that the part penetrates into the name of the transparent substrate film dissolved therein A compound capable of curing / crosslinking with a multifunctional photocurable / photopolymerizable compound (eg, a polyfunctional (meth) acrylate-based compound) in such a penetration state to form a binder, resin, or (co) polymer. Can be referred to collectively. To this end, the permeable compound may have a hydrophilic functional group such as a hydroxyl group or an alkoxy group to penetrate into the base film, the molecular weight is relatively small, and cause a curing / crosslinking reaction with the multifunctional photocurable / photopolymerizable compound To have a photocurable functional group such as a (meth) acrylate group or a tetrahydrofurfuryl group

3 Alternative Paper (Article 26) Can be. In this case, the "relatively small" molecular weight may refer to that the molecular weight of the permeable compound is smaller than the molecular weight average value of the total binder-forming compound included in the composition.

The permeable solvent may also refer to any organic solvent that melts at least a portion of the light transmissive base film to form a name through which the permeable compound can penetrate into the base film.

Also, silica hollow particles are silica particles derived from a silicon compound or an organosilicon compound, and mean particles having a void space on the surface and / or inside of the silica particles. According to one embodiment of the invention, as a resin composition for forming an optical film for forming an antiglare layer having an erosion layer and surface irregularities on the light-transmissive base film,

The binder-forming compound: The permeable solvent has a weight ratio of 1: 0.04 or more, and the resin composition for forming an optical film, wherein the permeable solvent is contained in an amount of 1 to 4.5 parts by weight based on 100 parts by weight of the total of the resin composition for forming an optical film. Is provided.

The resin composition for forming an optical film of one embodiment includes a plurality of light-transmitting fine particles, which are basic components for forming an anti-glare layer, and a trifunctional or higher functional polyfunctional (meth) acrylate-based compound, while a predetermined permeable compound and a permeable solvent are used. It is to include.

As a result of the experiments of the present inventors, when forming an antiglare layer with a composition containing such a permeable compound and a permeable solvent, it was confirmed that the erosion layer and the antiglare layer were respectively formed on the light-transmissive base film due to the following principle.

That is, the resin composition of the embodiment is a cellulose ester-based substrate film (for example, TAC substrate film), polyester-based substrate film (for example, PET

Alternative Site (Article 26) Base films), poly (meth) acrylate base films (e.g., PMMA base films), polycarbonate base films, cycloolefin base (COP) base films, acrylic (Acryl) base films and the like When applied to the base film, the permeable solvent will melt and penetrate at least a portion of the base film. As a result, a permeable compound having a hydrophilic functional group such as the hydroxy group or the alkoxy group and having a relatively small molecular weight can get wet and penetrate into the base film. Subsequently, when the photocuring process for forming the binder of the antiglare layer is carried out, the photocurable functional group of the permeable compound and the (meth) acrylate group of the polyfunctional (meth) acrylate compound are reacted with each other to form the polyfunctional ( The crosslinked co-polymer of the meth) acrylate-based compound and the permeable compound may be formed in a state penetrated into the light transmissive base film, and the crosslinked copolymer becomes a binder of the erosion layer, thereby forming an erosion layer in the light transmissive base film. Can be.

The anti-glare layer may be formed on the erosion layer and the light-transmissive base film while the cross-linked polymer of the multifunctional (meth) acrylate compound is formed by photocuring in a state where the light-transmitting fine particles are included.

Thus, the eroded layer in a light-transmitting substrate film and is in direct contact on the base film and the erosion layer anti-glare layer (in particular, such an anti-glare layer can ^'be formed in a state of forming a cross-linked to each other and the erosion layer.) While being formed, the adhesion between the base film and the antiglare layer can be greatly improved.

Further, the composition of the embodiment provides a permeable compound and a permeable solvent in a predetermined ratio, for example, the binder-forming compound: the permeable solvent in a weight ratio of 1: 0.04 or more, black 1: 1: 0.04 to 1: 0.1 Or 1: 0.04 to 1: 0.07, and the permeable solvent is 1 to 4.5 parts by weight, or 1.2 to 4 parts by weight, black, based on 100 parts by weight of the total composition of the embodiment. May be included in 1-3 parts by weight. It was confirmed that the surface hardness and the optical properties of the antiglare layer and the optical film can also be excellently maintained by the content and the content of the permeable compound and the permeable solvent.

If the ratio or content of the permeable solvent is too small or not included, the erosion layer is not formed properly, and the base film and the antiglare layer

5 Alternative Paper (Article 26) Adhesion can be greatly reduced. On the contrary, when the proportion or content of the permeable solvent is too high, the erosive solvent or the permeable compound may affect the coagulation of the light-transmitting fine particles, for example, the organic fine particles in the anti-glare layer. The surface hardness of the anti-glare layer, the surface irregularities of the anti-glare layer is not properly implemented, so that the glare of the anti-glare layer is high or the haze is out of an appropriate range.

On the contrary, when using the composition of the above-described embodiment, the adhesion between the antiglare layer and the transparent base film is improved, and the antiglare layer and the optical film exhibit excellent optical properties such as proper haze, low glossiness and excellent antiglare properties. It becomes possible.

Hereinafter, the composition of one embodiment will be described in detail for each component. First, the composition of one embodiment may be formed on a light-transmissive base film exhibiting at least light transmittance to visible light to form an erosion layer and an antiglare layer. Representative examples of such a transparent substrate film include a cellulose ester base film, a polyester base film, a poly (meth) acrylate base film, a polycarbonate base film, a cycloolefin-based (C base material film, or An acryl-based base film can be mentioned By forming the composition of one embodiment on these base films, an erosion layer can be formed suitably and the anti-glare layer which shows the outstanding hardness and optical characteristics can be formed. As such a cell-rose base film, a polyester base film, a poly (meth) acrylate base film, a polycarbonate base film, a cycloolefin (COP) base film, or an acrylic (Acryl) base film Any resin film, for example triacetyl cell, previously known to be applicable as a base film of an optical film Lawrence's (TAC) based film or a polyethylene terephthalate (PET) based material film, polymethyl methacrylate (PMMA) based material film, cyclo olefin (C ³⁾ a base film, or an acrylic (Acryl) based material film And so forth without any limitation.

In addition, in consideration of the excellent mechanical properties of the base film, water resistance, low moisture permeability, and the excellent optical properties of the optical film formed of one embodiment composition, the light-transmitting base film is 20 to 500, black 30 to 200; ωη, black is 40 to

6 Substitutes (Article 26) It may be a film having a thickness of 150 i, a polyester base film, a poly (meth) acrylate base film, a cycloolefin (CC) P) base film, or an acrylic (Acryl) base substrate having such a thickness A film can be used suitably.

On the other hand, the composition of one embodiment is a compound for forming a binder of the erosion layer and the antiglare layer, and includes a trifunctional or more than a multifunctional (meth) acrylate-based compound, and a permeable compound having a hydrophilic functional group and a photocurable functional group.

In these compounds, as the polyfunctional (meth) acrylate-based compound having a tri- or higher-functional (meth) acrylate group, a (meth) acrylate-based compound and / or 10 or more functional (3- or 6-functional monomolecular form) Polyurethane-based polymers having a meth) acrylate-based functional group, poly (meth) acrylic-based polymers or polyester-based polymers may be used together.

By the composition of such a binder, the haze characteristic of the said glare-proof layer and an optical film can be maintained in a more preferable range, and it can contribute to improving image sharpness more. If only 3 to 6 functional monomolecular (meth) acrylate-based compounds are used, the haze characteristics may be out of an appropriate range, or the image sharpness may be lowered, and the adhesion between the substrate and the antiglare layer may be reduced. This can be degraded. Specific examples of the (meth) acrylate-based compound of the 3 to 6 functional monomolecular form include a compound of the monomolecular form having 3 to 6 (meth) acrylate-based functional groups per molecule and an aromatic ring (for example , UA-306T and the like used in the following examples), and tri (meth) acrylate or trialkylolpropane tri (meth) acrylate can be mentioned.

And as a polyurethane type polymer, a poly (meth) acrylic-type polymerizer, or a polyester type polymer which has the said (10) functional or more (meth) acrylate type functional group, a polyurethane type polymer, a poly (meth) acrylic type polymer, or a polyester type polymerizer Polymers having an average of 10 to 80 or an average of 10 to 50 (meth) acrylate-based functional groups bonded to the main chain thereof may be used, and such polymers may have a weight average molecular weight of 1000 to 200000.

Furthermore, the (meth) acrylate type of the said 3-6 functional monomolecular form

7 Alternative Sites (Article 26) The compound and the polymerizer which has the said (10) functional or more (meth) acrylate type functional group are the weight ratios of 1: 1: 1: 10: 1, black is 1: 1-5: 1, black is 1: 1, for example. It can be used in the weight ratio of 3: 1.

On the other hand, as the permeable compound, having a hydrophilic functional group such as a hydroxy group or an alkoxy group, and having a relatively small molecular weight, can penetrate into the light-transmissive base film, the above-mentioned multifunctional (meth) acrylate compound and the scene Any compound that can be used to form a binder of the eroding layer can be used. Specific examples of such permeable compounds include monomolecular compounds having hydrophilic functional groups such as hydroxy groups and alkoxy and photocurable functional groups such as (meth) acrylate groups and tetrahydrofurfuryl groups, for example, tetrahydrofurfuryl alcohol (THFA ), A hydroxy (meth) acrylate type compound or 2- (2-ethoxy ethoxy) ethyl acrylate, etc. are mentioned.

Such a penetrating compound may be included in an amount of 1 to 10 parts by weight, black to 1.5 to 5 parts by weight, and black to 1.7 to 4 parts by weight based on 100 parts by weight of the total composition of the embodiment. If the content of the permeable compound is too small or not included, the erosion layer may not be properly formed and adhesion between the base film and the antiglare layer may be greatly reduced. On the contrary, when the ratio of a permeable compound becomes too high, the said permeable compound etc. can affect the puncturing of translucent microparticles | fine-particles, for example, organic microparticles | fine-particles with a permeable solvent in an antiglare layer. As a result, the surface hardness of the anti-glare layer and the optical film is lowered, or the surface irregularities of the anti-glare layer are not properly implemented, so that the anti-glare and optical properties of the anti-glare layer may be greatly reduced. In addition, when the content of the permeable compound and / or the permeable solvent is too high, the stability and productivity of the coating layer may also be reduced.

On the other hand, the composition of one embodiment includes a plurality of light-transmitting fine particles that can form the surface irregularities in the anti-glare layer to control the light scattering / light reflection. In addition, such light-transmitting fine particles can express surface irregularities on the antiglare layer as they have an appropriate particle diameter range, and have a constant refractive index range, thereby allowing the antiglare layer to control external light scattering / light reflection.

In one example, the light-transmitting microparticles include two or more kinds of fine particles having different particle diameters and refractive indices, for example, micron (scale) organic fine particles and nano (nm).

8 Alternative Sites (Article 26) Inorganic fine particles of a scale can be used together.

More specifically, as the organic fine particles, all resin particles previously known to be usable in the antiglare layer and the like can be used without particular limitation, and specific examples thereof include polystyrene resin, poly (meth) acrylate resin or poly ( And resin fine particles containing meth) acrylate-CO-styrene copolymer resin.

In addition, such organic fine particles are, for example, 1 to 5

Black is a spherical particle having a particle size of 1.5 to 4, and has a refractive index of 1.5 to 1.6, or 1.5 to 1.57, or 1.51 to 1.56, or 1.53 to 1.56 Can be. As the inorganic fine particles, metal oxide fine particles including silica, alumina, zirconia, or titania may be used. For example,

10 nm to 300 nm, black is a spherical particle having a particle size of 50 to 200 nm, it is 1.4 to 1.75, black is 1.1.4 to 1.65, black is 1.42 to 1.48, or 1.42 to 1 It may have a refractive index of .45.

By including the above-mentioned organic / inorganic fine particles, the size of the irregularities protruding to the surface of the antiglare layer is uniformly and appropriately controlled so that the haze characteristics or glossiness of the antiglare layer can be adjusted to a desired range. The antiglare layer and the optical film may exhibit better antiglare properties / optical properties.

The light-transmitting fine particles described above are, for example, 1 to 30 parts by weight, black to 2 to 20 parts by weight, and black to 3 to about 100 parts by weight of the total amount of the binder-forming compound and the light-transmitting particles included in the composition of one embodiment. It may be included in an amount of 10 parts by weight, or 3 to 5 parts by weight. The organic fine particles and the inorganic fine particles may be used in a weight ratio of 5: 1 to 1: 5, or 3: 1 to 1: 3, and black is 2: 1 to 1: 2. As a result, the optical properties / antiglare properties of the antiglare layer and the optical film may be further improved. If the total content of the fine particles is too small, the surface irregularities on the antiglare layer may not be properly implemented, so that scattering / reflection of external light may not be properly controlled, and thus antiglare characteristics may be deteriorated. On the contrary, when the total content of the fine particles is too large, the refraction of the transmitted image light may increase, and the image sharpness of the optical film may be greatly reduced.

On the other hand, the composition of one embodiment described above is a compound for forming a binder and

9 Alternative Paper (Article 26) In addition to the light transmitting fine particles, it further comprises a permeable solvent. As described above, the permeable solvent is a component that dissolves a part of the light transmissive base film to allow the permeable compound to penetrate and to form the erosion layer.

Such a permeable solvent is included in a ratio such that the binder-forming compound: the permeable solvent is in a weight ratio of 1: 0.04 or more, black is 1: 0.04 to 1: 0.1, and black is 1: 0.04 to 1: 0.07. 1 to 4.5 parts by weight, black to 1.2 to 4 parts by weight, or 1.3 to 3 parts by weight, based on 100 parts by weight of the total composition of the embodiments. By the content and the content of such a permeable solvent, etc., despite the formation of the erosion layer, the surface hardness and the optical properties of the anti-glare layer and the optical film forming the composition of one embodiment can be maintained excellent.

As the permeable solvent, a solvent capable of dissolving the substrate film at an appropriate level may be obviously selected by those skilled in the art according to the kind of the light-transmissive substrate film. However, the base film of the kind already mentioned above, ie, a cellulose ester base film, a polyester base film, a poly (meth) acrylate base film, a cycloolefin (COP) base film, or an acryl (Acryl) In the case of forming an erosion layer / anti-glare layer on a base substrate film, a ketone solvent such as methyl ethyl ketone, methyl isobutyl ketone, or acetone, toluene, xylene or tetrahydrofuran may be appropriately used. Can be. On the other hand, the resin composition of one embodiment may further include an organic solvent in addition to the photoinitiator and a permeable solvent in addition to each component described above.

In such compositions, conventionally known photoinitiators can be used as the photoinitiator without great limitation. Examples of the photoinitiator are selected from 1-hydroxycyclonucleophenylphenyl ketone, benzyl dimethyl ketal, hydroxydimethylacetophenone, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzoin butyl ether. One single or two or more combinations.

In this case, the photoinitiator may be added in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the above-described binder forming compound. When the photoinitiator is included in less than 0.1 part by weight, the photocuring may not occur due to ultraviolet irradiation, and when included in excess of 10 parts by weight, the adhesion of the anti-glare layer and the base film, etc.

10 Alternative Sites (Article 26) Can be degraded. Furthermore, when the photoinitiator is contained in an excessively large content, the antiglare layer and the optical film including the same may be yellowed by a non-reflective initiator over time, thereby decreasing optical properties of the optical film.

In addition, the composition may further comprise, in addition to the permeable solvent, an organic solvent as a medium for dispersing / dissolving the remaining components included in the composition of one embodiment. When such an organic solvent is added, there is no limitation in the constitution, but in consideration of securing the appropriate viscosity of the composition and the film strength of the film to be finally formed, the amount of the binder forming compound 100 is preferably 50 to 50 parts. 700 parts by weight, more preferably 100 to 500 parts by weight, most preferably 150 to 450 parts by weight can be used.

At this time, the type of organic solvent that can be used is not limited in its constitution, but is composed of lower alcohols, acetates, cellosolves, dimethylformamide, and propylene glycol monomethyl ether having 1 to 6 carbon atoms different from the permeable solvent. One or more combinations selected from the group can be used.

In this case, the lower alcohols include methanol, ethanol, isopropyl alcohol, butyl alcohol, isobutyl alcohol, diacetone alcohol, and the like. As the acetates, methyl acetate, ethyl acetate, isopropyl acetate, butyl acetate, or cellosolve acetate may be used.

On the other hand, the composition of one embodiment may further comprise at least one additive selected from the group consisting of dispersants, leveling agents, wetting agents, antifoaming agents and antistatic agents. In this case, the additive may be added in the range of 0.01 to 10 parts by weight relative to 100 parts by weight of the binder-forming compound.

The erosion layer / anti-glare layer may be formed by applying the composition of the above-described embodiment to one surface of the light-transmissive base film and proceeding drying and photocuring. Such drying and photocuring conditions are general process conditions for forming an anti-glare layer. The specific process conditions are also described in the examples below.

On the other hand, according to another embodiment of the invention, there is provided an optical film formed of the composition of one embodiment described above. One example of such an optical film is a light transmissive substrate

11 Alternative Site (Article 26) film; An erosion layer formed by being eroded in the light transmissive base film so as to overlap at least a portion of the light transmissive base film and including a first binder including a first (meth) acrylate-based crosslinked polymer; And a second binder including a second (meth) acrylate-based crosslinked polymer, and two or more light-permeable fine particles having a sub-micron scale dispersed on the second binder, wherein the light-transmitting base film And an antiglare layer formed to have surface irregularities on the erosion layer, wherein the erosion layer has a thickness of 50 nm or more and 2 μ \ η or less, and the total haze of the antiglare layer is 1 to 5 ° / ^° , 60 ^° Glossiness is 75% to 90 ° /.

As the optical film of the other embodiment is formed of the resin composition of one embodiment, the cross-linked co-polymer (that is, the first (meth) acrylate-based crosslinking of a trifunctional or higher functional polyfunctional (meth) acrylate-based compound and the permeable compound) A first binder comprising a polymer) is eroded and formed in the light transmissive base film, thereby including, for example, an erosion layer as shown in FIGS. 1 and 2.

In addition, on this erosion layer and the light-transmissive base film, the crosslinked polymer (ie, the first (meth) acrylate-based crosslinked polymer of the polyfunctional (meth) acrylate-based compound that did not penetrate into the base film in the composition of one embodiment) An antiglare layer comprising a second (meth) acrylate-based crosslinked polymer having a molecular weight) as a first binder is formed, and in the second binder, two or more kinds of light-transmitting fine particles, for example, the organic and inorganic materials described above. Particulates are included to form surface irregularities.

In this case, the first and second binders are formed by a single photocuring process, and at least some of the multifunctional (meth) acrylate-based compounds forming the first and second binders may form crosslinks with each other. The erosion layer and the antiglare layer are chemically bonded to each other. Accordingly, optical films of other embodiments may exhibit good adhesion between the base film / erosion layer and the antiglare layer.

In addition, the optical film is formed of a composition of one embodiment containing a permeable compound and / or a permeable solvent in an appropriate ratio, the erosion layer is 100nm or more 2 or less-, black 150nm or more 1.5 ^ tn or less, black 300nm It can be formed to an appropriate thickness of not less than 1.3, or more than 500nm 1.0. In addition, the above

12 Alternative Sites (Article 26) Optical films are due to the proper proportions of permeable compounds and / or permeable solvents such that these components do not interfere with the coagulation of the translucent particulates, resulting in the antiglare layer and the optical film having excellent haze and low glossiness with good surface hardness. It can exhibit excellent anti-glare characteristics / optical characteristics.

Accordingly, the optical film of another embodiment can simultaneously exhibit excellent anti-glare properties / optical properties, together with good adhesion to a base film and high surface hardness, and thus can be preferably used in various polarizing plates and / or image display devices. Hereinafter, the above-described optical film will be described in more detail. However, for each component included in the erosion layer / anti-glare layer, as already described in detail with respect to the composition of one embodiment, the following will be described in detail with the exception of this.

In the optical film of the other embodiment, the anti-glare layer may have a thickness of 1 to 10 kPa, or 2 to 8. As a result, the above-mentioned light-transmitting fine particles form an appropriate surface irregularities on the surface of the antiglare layer so that the antiglare layer can exhibit excellent antiglare properties, and the thickness ratio between the antiglare layer and the erosion layer is preferably controlled, thereby further improving the base film and the antiglare layer Adhesion may be expressed.

In the optical film, the second binder may have a refractive index of about 1.50 to about 1.60. Accordingly, the absolute value of the difference in refractive index between the second binder and the light transmitting fine particles of the antiglare layer, for example, the second binder and the light transmitting fine particle, is 0.25 or less, black is 0.01 to 0.25, or 0.02 to 0.25, Or 0.02 to 0.10, and the antiglare layer may exhibit low glossiness, appropriate haze properties, and further improved antiglare properties.

The optical film of another embodiment may have excellent anti-glare properties by appropriately suppressing scattering or reflection of external light, as well as excellent mechanical properties such as hardness and adhesion, according to each component and configuration described above, low glossiness, suitable solution Excellent optical properties such as ease characteristics can be exhibited. Such excellent optical properties can be defined as the low gloss of its surface. For example, the antiglare layer and the optical film may be 60 ^° gloss 75% to 90%, or 80% to 88%, 20 ^° gloss 45% to 68%, black 55% to 67 Can be%.

In addition, the optical film has a total haze of 1 to 5%, or 1 to 4%,

13 Alternative Sites (Article 26) Black is 1 to 3.5% to maintain an appropriate level. When the total haze is too high, it is obvious that the optical properties are deteriorated, and even when the total haze value is too low, the external reflection image is not scattered and viewed, so that the visibility and image sharpness of the screen may be deteriorated.

On the other hand, the above-described optical film of another embodiment may further include a low refractive layer formed on the anti-glare layer. The low refractive index layer may include a binder resin including a (co) polymer of a photopolymerizable compound and hollow silica particles dispersed in the binder resin.

By including such a low refractive layer, the reflection itself in the light transmissive base film can be reduced, and as a result, the occurrence and reflectance of the interference fringe in the optical film of another embodiment can be further reduced. In addition, by using such a low refractive index layer, it is possible to reduce the diffuse reflection on the display surface of the image display device to further improve the resolution and visibility.

Such a low refractive index layer is, for example, in order to effectively suppress reflection in the base film or diffuse reflection round at the display surface of the display device, for example, from 1.3 to

It has a refractive index of 1.5 and may have a thickness of 1 to 300 nm.

The low refractive index layer may be formed from a photocurable coating composition for forming a low refractive index layer including a photopolymerizable compound and vaporized silica particles. Specifically, the low refractive index layer may include a binder resin including a (co) polymer of the photopolymerizable compound and hollow silica particles dispersed in the binder resin.

The photopolymerizable compound included in the low refractive layer may include a monomer or oligomer including a (meth) acrylate or a vinyl group. Specifically, the photopolymerizable compound may include a monomer or oligomer containing (meth) acrylate or vinyl group of one or more, two or more, or three or more.

Specific examples of the monomer or oligomer containing the (meth) acrylate include tri (meth) acrylate for pentaerythrite, tetra (meth) acrylate for pentaerythri, penta (meth) acrylate for dipentaerythr, Dipentaerythri nucleus (meth) acrylate, tripentaerythrib hepta (meth) acrylate, triylene diisocyanate, xylene diisocyanate, nucleated methylene diisocyanate, trimethylolpropane tri (meth) acrylate;

14 Alternative Sites (Article 26) Trimethyl to propane polyethoxy tri (meth) acrylate, trimethyl to propane trimethacrylate, ethylene glycol dimethacrylate, butanediol dimethacrylate, nuxaethyl methacrylate, butyl methacrylate or two or more thereof A mixture, a urethane modified acrylate oligomer, an epoxide acrylate oligomer, an ether acrylate oligomer, a dendritic acrylate oligomer, or these 2 or more types of mixtures are mentioned. At this time, the molecular weight of the oligomer is preferably 1,000 to 10,000.

Specific examples of the monomer or oligomer containing the vinyl group include divinylbenzene, styrene or paramethylstyrene.

Meanwhile, the photocurable coating composition for forming the low refractive index layer may further include a fluorine-based compound including a photoreactive functional group. Accordingly, the binder resin of the low refractive layer may include a crosslinked polymer between the photopolymerizable compound and the fluorine-based compound including the photoreactive functional group.

The fluorine-based compound including the photoreactive functional group may include or replace one or more photoreactive functional groups, and the photoreactive functional group may participate in the polymerization reaction by irradiation of light, for example, by irradiation of visible light or ultraviolet light. It means a functional group. The photo-banung functional group may include various functional groups known to be able to participate in the polymerization reaction by irradiation of light, specific examples thereof include (meth) acrylate group, epoxide group, vinyl group (Vinyl) or thiol group ( Thi).

The fluorine-based compound including the photoreactive functional group may have a fluorine content of 1% by weight to 25% by weight. If the content of fluorine is too small in the fluorine-based compound including the photoreactive functional group, it may be difficult to sufficiently secure physical properties such as contamination resistance or alkali resistance of the low refractive index layer. In addition, when the content of fluorine is too high in the fluorine-based compound including the photoreactive functional group, the scratch-resistant surface properties of the low refractive layer may be degraded.

The fluorine-based compound including the photoreactive functional group may further include silicon or a silicon compound. That is, the fluorine-based compound including the photoreactive functional group may optionally contain a silicon or silicon compound therein.

15 Alternative Paper (Article 26) The fluorine-based compound including the photoreactive functional group may have a weight average molecular weight (weight average molecular weight in terms of polystyrene measured by GPC method) of 2,000 to 200,000. If the weight average molecular weight of the fluorine-based compound including the photo-banung functional group is too small, the low refractive layer obtained from the photocurable coating composition of the embodiment may not have sufficient alkali resistance. In addition, when the weight average molecular weight of the fluorine-based compound including the photoreactive functional group is too large, the low refractive layer obtained from the photocurable coating composition of the embodiment may not have sufficient durability or scratch resistance.

The photocurable coating composition may include 0.1 to 10 parts by weight of a fluorine-based compound including the photoreactive functional group based on 100 parts by weight of the photopolymerizable compound of the monomer or oligomer including the (meth) acrylate or vinyl group. When an excess amount of the fluorine-based compound including the photoreactive functional group is added to the photopolymerizable compound, the coating property of the photocurable coating composition may be lowered or the low refractive layer obtained from the photocurable coating composition may not have sufficient durability or scratch resistance. Can be. In addition, when the amount of the fluorine-based compound including the light semi-functional group compared to the photopolymerizable compound is too small, the low refractive layer obtained from the photocurable coating composition may not have sufficient alkali resistance.

Meanwhile, the vaporized silica particles refer to silica particles having a maximum diameter of less than 200 nm and having empty spaces on the surface and / or inside thereof. The hollow silica particles may have a diameter of 1 to 200 nm, or 10 to 100 nm.

As the hollow silica particles, those whose surfaces are coated with a fluorine compound may be used alone, or may be used in combination with vaporized silica particles whose surface is not coated with a fluorine compound. Coating the surface of the hollow silica particles with a fluorine-based compound can lower the surface energy, and thus the hollow silica particles can be more uniformly distributed in the photocurable coating composition, the film obtained from the photocurable coating composition Durability and scratch resistance can be further improved.

And, the hollow silica particles are dispersed in a predetermined dispersion medium

16 Alternative Paper (Article 26) It may be included in the composition in the colloidal form. The colloidal phase including the hollow silica particles may include an organic solvent as a dispersion medium.

Here, as the organic solvent in the dispersion medium, alcohols such as methanol, isopropyl alcohol, ethylene glycol, butanol; Ketones such as methyl ethyl ketone and methyl isobutyl ketone; Aromatic hydrocarbons such as toluene and xylene; Dimethylformamide. Amides such as dimethylacetamide and N-methylpyridone; Esters such as ethyl acetate, butyl acetate and gamma butyrolactone; Ethers such as tetrahydrofuran and 1,4-dioxane; Or combinations thereof.

The photocurable coating composition may include 10 to 500 parts by weight of the hollow silica particles, or 50 to 400 parts by weight, based on 100 parts by weight of the photopolymerizable compound. When the hollow silica particles are added in an excessive amount, scratch resistance or abrasion resistance of the coating film may decrease due to a decrease in the content of the binder. In addition, when the hollow silica particles are added in a small amount, uniform film formation of the silica silica particles may not be achieved, and a desired effect may not be properly exhibited due to high reflectance and refractive index.

The photopolymerization initiator may be used without limitation as long as it is a compound known to be used in the photocurable coating composition. Specifically, a benzophenone compound, acetophenone compound, biimidazole compound, triazine compound, oxime compound or Two or more kinds thereof can be used.

For 100 parts by weight of the photopolymerizable compound, the photopolymerization initiator may be used in an amount of 1 to 100 parts by weight.

Meanwhile, the photocurable coating composition may further include an organic solvent. Non-limiting examples of the organic solvent include ketones, alcohols, acetates and ethers, or a combination of two or more thereof.

Specific examples of such organic solvents include ketones of methyl ethyl kenone, methyl isobutyl ketone, acetylacetone or isobutyl ketone; Alcohols such as methanol, ethanol, n-propanol, i-propanol, n-butanol, ί-butanol, or t-butanol; Acetates such as ethyl acetate, i-propyl acetate, or polyethylene glycol monomethyl ether acetate; Ethers such as tetrahydrofuran or propylene glycol monomethyl ether; Or two or more kinds thereof.

17 Alternative Sites (Article 26) The organic solvent may be included in the photocurable coating composition while being added at the time of mixing each component included in the photocurable coating composition or in the state in which each component is dispersed or mixed in the organic solvent.

Meanwhile, the low refractive layer included in the optical film of another embodiment may be obtained by applying the above-described photocurable coating composition on the antiglare layer and drying and photocuring the applied resultant. Specific process conditions of such a low refractive index layer may be in accordance with conditions apparent to those skilled in the art.

According to another embodiment of the invention, there is provided a polarizing plate and an image display device including the above-described optical film.

An example of such a polarizing plate and an image display device may be made as follows.

The image display device includes a pair of polarizing plates facing each other; A thin film transistor, a color filter, and a liquid crystal cell sequentially stacked between the pair of polarizing plates; And a liquid crystal display device including a backlight unit, wherein the polarizing plate at least on the image display surface side may include a polarizing element and an optical film of the above-described embodiment formed on the polarizing element.

Such an optical film can, for example, act as a polarizer protective film and / or an antireflection film to exhibit the excellent properties already described above. On the other hand, the polarizing plate and / or the image display element may be in accordance with a conventional configuration except that including the optical film of the embodiment, further description thereof will be omitted.

【Effects of the Invention】

According to the present invention, the composition for forming an optical film, which improves the adhesion between the antiglare layer and the transparent base film and enables the antiglare layer and the optical film to exhibit excellent optical properties such as appropriate haze, low glossiness and excellent antiglare properties This may be provided.

Using such a composition, an optical film that simultaneously satisfies excellent mechanical properties and optical properties can be provided, which can be preferably used in various image display devices to greatly improve its visibility and the like.

[Brief Description of Drawings]

18 Alternative Sites (Article 26) 1 is an electron micrograph showing a cross-sectional shape (particularly, formation of a base film / erosion layer / antiglare layer) of an optical film formed in Example 2. FIG.

FIG. 2 is an electron micrograph showing the cross-sectional shape (particularly, formation of a base film / erosion layer / antiglare layer) of the optical film formed in Example 3. FIG.

[Form for implementation of invention]

Specific embodiments of the invention are described in more detail in the following examples. However, the following examples are merely to illustrate specific embodiments of the invention, the content of the specific embodiments of the invention is not limited by the following examples.

Preparation Example: Preparation of Antiglare / Erosion Layer Formation Composition>

(1) Preparation of antiglare forming composition

The components of Tables 1 and 2 were mixed uniformly to prepare a composition for forming an optical film (antiglare layer). The contents of all components used in Tables 1 and 2 are expressed in parts by weight.

TABLE 1

19 Alternative Sites (Article 26) Leveling agent T100 0.5 0.13 0.13 0.4 0.13 0.13 Permeable solvent Methylethylkerone 1.1 1.48 1.48 1.1 1.34 1.34

IPA 34.4 34.91 34.91 22.9 34.98 34.98 Other Solvents

BOH 34.4 34.91 34.91 45.8 34.98 34.98 Total 100 100 100 100 100 100 Permeable Solvent / Binder Formation

0.041 0.06 0.06 0.04 0.05 0.05 Compound (weight ratio)

TABLE 2

20

Alternative Site (Article 26) 1) THFA: tetrahydrofurfuryl alcohol

2) HEA: 2-hydroxyethyl acrylate

3) UA-306T: (Kyoeisha): Hexafunctional acrylate compound formed by reacting two pentaerythriritriacrylates with toluene diisocyanate.

4) Beamset 371 (ARAKAWA CHEMICAL):

Polyurethane / ester backbones with polymers of about 50 functional epoxy acrylate functional groups

5) 8BR-500 (TAISEI FINE CHEMICAL):

A polymer in which a polyacryl main chain is bound to around 40 functional urethane acrylate functional groups.

6) TMPTA: trimethylolpropane triacrylate

7) PETA: Pentaerythritol triacrylate

8) I184 (lrgacure 184): photoinitiator, manufactured by Ciba.

9) T-100 (Tego glide 100): Leveling agent, manufactured by Evonik.

10) 103BQ (XX-103BQ, manufactured by Sekisui Plastic): PMMA-PS crosslinked copolymer fine particles having a refractive index of 1.515 (about 1.52) and an average particle diameter of 2

1 1) 1 13BQ (XX-1 13BQ, manufactured by Sekisui Plastic): PMMA-PS crosslinked copolymer fine particles having a refractive index of 1.555 (about 1.56) and an average particle diameter of 2 μs

12) MA-ST: spherical silica fine particles having a volume average particle diameter of 12 nm and a refractive index of 1.43 (manufactured by Nissan Chemical)

As shown in Tables 3 and 4. below, the above-mentioned preparations were made on PET substrate films having a thickness of 80 βΐ and a refractive index of 1.6 to 1.7 (or acrylic base films having a thickness of 60 μm and refractive indexes of 1.4 to 1.6). After applying the compositions prepared in each of Examples 1 to 6 or Comparative Preparation Examples 1 to 7 and dried for 1 minute at 90 ^° C., an anti-glare layer was prepared by irradiating 150 mJ / crf of ultraviolet rays.

After forming an anti-glare layer and manufacturing an optical film, respectively, the optical film cross section of Examples 2 and 3 was observed with the electron microscope, and the formation of the erosion layer was confirmed. remind

21 Alternative Paper (Article 26) Electron micrographs of Examples 2 and 3 are shown in Figs. 1 and 2, respectively (in Fig. 1, no translucent particulates were observed due to the viewing direction). In the same manner, it was confirmed whether the erosion layer was formed in the remaining examples and comparative examples. Experimental Example: Measurement of Physical Properties of Optical Film

The physical properties of the prepared optical film were measured according to the following methods, which are shown in Tables 3 and 4 below.

1. Refractive Index Measurement

Refractive index of the binder, anti-glare layer, etc. included in the optical film was measured in the state of being coated on the wafer using an ellipsometer. More specifically, the refractive index of the binder, the anti-glare layer and the low refractive index layer is applied to a 3 cm X 3 cm wafer each composition, and after the coating by using a spin coater (coating conditions: 1500rpm, 30 seconds), 90 ^° C It was dried for 2 minutes at and irradiated with ultraviolet light under the condition of 180 mJ / cm ² under nitrogen purging. This formed each coating layer having a thickness of 100nm.

For this coating layer, using a lam Co. refractive index measuring equipment (model name: M-2000), the angle of incidence of 70 ^° was applied, and linearly polarized light was measured in the wavelength range of 380 nm to 1000 nm. The measured linear light measurement data (ellipsometry data (Ψ, Δ)) was optimized to a MSE of 3 or less with a Cauchy model of the following general formula 1 using Complete EASE software.

In the above formula, η (λ) is the refractive index at the λ wavelength (300nm ~ 1800nm), A, B, C, is a Kosh parameter.

In addition, the refractive index of the base film and each microparticle used the information provided about a commercial item.

2. Erosion Layer / Antiglare Thickness Evaluation

The average thickness of the erosion layer / anti-glare layer was measured through electron micrographs as shown in FIGS. 1 and 2.

22 Alternative Paper (Article 26) 3. Overall / Internal / External Haze Evaluation

An optical film specimen of 4 cm × 4 cm was prepared and measured three times with a haze meter (HM-150, A light source, Murakamisa) to calculate an average value, which was calculated as the total haze value. In the measurement, the transmittance was measured by JIS K 7361 standard and haze by JIS K 7105 standard. At the time of internal haze measurement, after making the surface unevenness | corrugation of the surface of the optical film of measurement object affixing the adhesive film of total haze to 0, the internal haze was measured by the same method as the above whole haze. 4. 20 ^° / 60 ^° gloss rating

The glossiness of 20 ^° / 60 ^° was measured using micro-TRI-gloss manufactured by BYK Gardner. When measuring, attach black tape (3M) to prevent light from passing through the surface where the coating layer of the base film is not formed.

Were measured 20 ^{^°} / 60 ^° gloss by varying a 20 ^{^°} / 60 ^°, the average value was calculated by measuring at least 5 times each glossiness value.

5. Pencil Hardness (500gf)

Measured according to ASTM D3363 standard, the measuring instrument was used JS pencil pencil hardness tester. In the measurement, the film specimen was cut into 7 cm x 7 cm, fabricated, and fixed on a glass plate. Then, the hardness under 500 g load was measured using a Mitsubishi pencil. When five times per pencil was measured and 4 or more were good, it evaluated as having no scratch in the said hardness. The measurement length was 5 cm, and the scratch at 0.5 cm at the beginning of the hardness measurement was determined. 6. Evaluation of adhesion

The adhesion of the antiglare layer and the base film was measured on the antiglare side surface.

23 Alternative Sites (Article 26) TABLE 3

TABLE 4

24 Alternative Sites (Article 26) Erosion Layer Formation XX 0 X

X 0 O

Whether

Erosion layer thickness 0 -500nm ~ 1.5 rn 0 0 -1 100nm 0 Total haze 1.2 0.7 2.2 3.2 3.1 1.9 2.9 Internal haze 0.7. 0.6 2.0 2.3 2.1 1.7 1.8 Glossiness (20 degrees) 66.6 70.7 70.0 65 64 70 64 Glossiness (60 degrees) 87.1 92.6 91.7 86 85 91.5 86 Pencil hardness 3H 3H H 3H 3H 3H 3H Adhesion 2B> 4B 3B <3B <3B 5B <3B

Referring to Table 3, it was confirmed that the optical film of the example exhibits excellent optical properties such as low glossiness and appropriate level of haze properties, and excellent mechanical properties such as high surface hardness and adhesion.

On the other hand, Comparative Examples 1 to 7 formed of a composition containing no permeable compound and / or a permeable solvent, or deviating from the proper ratio / content thereof, have no erosion layer to form, resulting in poor adhesion (Comparative Examples 1, 4, 5, 7) The formation of erosion layers is not properly controlled, and the surface hardness is poor (Comparative Example 3), or the optical characteristics (low haze or high glossiness) are poor (Comparative Example 2, 3 ，

6) was confirmed. For reference, if the glossiness is too high, the reflection of external light cannot be suppressed properly. If the haze value is too low, the external reflection image is not scattered and visually recognized, so that the visibility and image sharpness of the screen are poor.

25 Alternative Sites (Article 26)

Claims

[Claim]

[Claim 1]

As a resin composition for optical film formation for forming the anti-glare layer which has an erosion layer and surface unevenness on a transparent base film,

The binder compound: The permeable solvent has a weight ratio of 1: 0.04 or more, and the permeable solvent is contained in an amount of 1 to 4.5 parts by weight based on 100 parts by weight of the total of the resin composition for forming an optical film.

[Claim 2]

The method of claim 1, wherein the light-transmitting substrate film has a thickness of 20 to 500 Sallo ester-based substrate film, polyester-based substrate film, poly (meth) acrylate-based substrate film, polycarbonate-based substrate film, cyclo The resin composition for optical film formation which is an olefin type (COP) base film or an acrylic (Acryl) base film.

[Claim 3]

According to claim 1, wherein the tri- or more polyfunctional (meth) acrylate-based compound has a (meth) acrylate-based compound of the 3-6 functional monomolecular form, having a (meth) acrylate-based functional group of 10 or more functional Resin composition for optical film formation containing a polyurethane polymer, a poly (meth) acrylic polymer, or a polyester polymer.

[Claim 4]

The method of claim 1, wherein the permeable compound is tetrahydrofurfuryl alcohol (THFA), hydroxy (meth) acrylate compound or 2- (2-specific)

26 Alternative Sites (Article 26) Resin composition for optical film formation containing ethyl acrylate.

[Claim 5]

The resin composition for forming an optical film according to claim 1, wherein the permeable compound is contained in an amount of 1 to 10 parts by weight based on 100 parts by weight of the total resin composition for forming the optical film.

[Claim 6]

The resin composition for forming an optical film according to claim 1, wherein the light transmissive fine particles comprise organic fine particles of micron scale and inorganic fine particles of nanoscale.

[Claim 7]

The resin composition for forming an optical film according to claim 6, wherein the organic fine particles are resin fine particles containing a polystyrene resin, a poly (meth) acrylate resin, or a poly (meth) acrylate-co-styrene copolymer resin.

[Claim 8]

The resin composition for forming an optical film according to claim 6, wherein the organic fine particles are spherical particles having a particle diameter of 1 to 5, and have a refractive index of 1.5 to 1.6.

[Claim 9]

The resin composition for forming an optical film according to claim 6, wherein the inorganic fine particles are metal oxide fine particles containing silica, alumina, zirconia, or titania.

[Claim 10]

The resin composition for forming an optical film according to claim 6, wherein the inorganic fine particles are spherical particles having a particle diameter of 10 nm to 300 nm, and have a refractive index of 1.4 to 1.75.

27 Alternative Sites (Article 26) [Claim 1 1 1

The resin composition for forming an optical film of claim 1, wherein the permeable solvent comprises a ketone solvent, toluene, xylene, or tetrahydrofuran.

[Claim 12]

Light-transmissive base film;

An erosion layer formed by being eroded in the light transmissive base film so as to overlap at least a portion of the light transmissive base film and comprising a first binder including a first (meth) acrylate-based crosslinked polymer; and

A second binder including a second (meth) acrylate-based crosslinked polymer and a book dispersed on the second binder

An anti-glare layer comprising two or more light-transmitting fine particles having a scale, the anti-glare layer formed to have surface irregularities on the light-transmissive base film and the eroding layer;

The erosion layer has a thickness of more than 100nm 2 / less,

The total haze of the anti-glare layer is 1 to 5%, 60 ^° glossiness 75% to 90 ° /.

[Claim 13]

The optical film of claim 12, wherein the 20 ^° glossiness is between 45% and 68%.

[Claim 14]

The optical film of claim 12, wherein the second binder has a refractive index of 1.50 to 1.60.

[Claim 15]

The optical film of claim 12, wherein the anti-glare layer has a thickness of 1 to 10. [Claim 16]

28 Alternative Sites (Article 26) The optical film according to claim 12, further comprising a binder resin formed on the antiglare layer and comprising a (co) polymer of a photopolymerizable compound and a low refractive layer containing hollow silica particles dispersed in the binder resin. .

[Claim 17]

The optical film of claim 16, wherein the low refractive index layer has a refractive index of about 1.3 to about 1.5 and a thickness of about 1 to about 300 nm.

[Claim 18]

A polarizing plate comprising the optical film of claim 12.

29 Alternative Sites (Article 26)