KR20170034045A

KR20170034045A - Scattering protecting film

Info

Publication number: KR20170034045A
Application number: KR1020150132215A
Authority: KR
Inventors: 권윤경; 김현철
Original assignee: 주식회사 엘지화학
Priority date: 2015-09-18
Filing date: 2015-09-18
Publication date: 2017-03-28
Also published as: KR102017277B1

Abstract

The present invention relates to a shatterproof film. The shatterproof film of the present invention can have a blue light blocking effect at a wavelength of about 380 to 500 nm by including an indole compound in an adhesive layer thereof. Therefore, even if exposed to a monitor, a smart phone or a TV for a long time, it can prevent eye fatigue and a dry eye syndrome.

Description

SCATTERING PROTECTING FILM [0002]

The present application relates to a light-scattering film.

The glass is applied to a touch panel or a touch screen to constitute various information processing terminals such as a mobile communication terminal (smart phone) or an ATM, and a display device such as a TV and a monitor.

There is a disadvantage that the glass can be damaged by an external impact, which causes additional damage due to scattering of the glass fragments due to such breakage. In order to prevent such scattered glass from scattering, a shatterproof film is attached to the glass surface.

Patent Document 1 discloses the above-mentioned shrinkage prevention film.

On the other hand, blurlight, which is a blue light source of 380 to 495 nm wavelength emitted from a monitor, a smart phone, and a TV, causes eye dryness as well as eye fatigue when exposed for a long time. In severe cases, To damage.

1: Korea Patent Publication No. 2010-0134692

The present application provides a film for preventing scattering.

The present application relates to a light-scattering film.

The anti-scattering film comprises a substrate layer; And

And an adhesive layer formed on at least one surface of the substrate layer,

The following general formula (1) can be satisfied.

[Formula 1]

Represents the blocking rate (%) of the above formula C, shatterproof film, T _G represents the transmittance at 400nm of the glass (soda lime) of 300 μm thickness, T _F is the transmittance at 400nm of the anti-scattering film having a thickness of 390 μm .

Specifically, the blocking ratio of the shrinkage prevention film may be 95% or more. In the present application, excellent blue light blocking effect can be obtained by maintaining the blocking rate at 90% or more.

In addition, the yellowing index (YI) of the shrinkage preventing film may be 15% or less, 12% or less, 10% or less, 8% or less, or 7% or less. The lower limit of the yellow index may be more than 0 or 0.1% or more. The yellowing means the shape in which the color of the transparent coating changes with time. The yellowing index is calculated by the spectral data according to JIS K 7105-1 (ASTM E313), the degree of change of the transparent or white coating to yellow It can mean a number.

In one example, the adhesive layer of the anti-scattering film comprises a tacky polymer; And an indole-based ultraviolet absorber.

In the present application, the pressure-sensitive adhesive polymer may have a weight average molecular weight of 300,000 or more, 300,000 to 2,500,000, 300,000 to 2,000,000 or 300,000 to 150,000. When the weight average molecular weight of the adhesive polymer is within this range, the effect of adding the adhesive polymer can be increased, and thus the storage elastic modulus and / or viscosity of the adhesive layer including the adhesive polymer described below can be adjusted to a specific range or more.

The tacky polymer may be an acrylic polymer, and the acrylic polymer may be a polymer derived from a composition comprising an acrylic monomer.

The acrylic monomer may be a (meth) acrylic acid ester monomer. The kind of such (meth) acrylic acid ester monomer is not particularly limited. In the present application, for example, alkyl (meth) acrylate can be used, and specifically, an alkyl (meth) acrylate having an alkyl group having 1 to 14 carbon atoms, preferably 1 to 8 carbon atoms in view of controlling the adhesive force of the adhesive layer Methacrylate may be used. Examples of such monomers include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, (Meth) acrylate, sec-butyl (meth) acrylate, pentyl (meth) acrylate, 2- ethylhexyl , Isooctyl (meth) acrylate or isononyl (meth) acrylate, and one kind or a mixture of two or more kinds can be used.

In addition, the acrylic monomer may mean a compound containing a copolymerizable functional group such as a carbon-carbon double bond in the molecule and a crosslinkable functional group at the same time. The crosslinkable monomer may provide a crosslinking point by providing a crosslinkable functional group to the acrylic resin, or may control the reliability or adhesiveness of the adhesive layer under high temperature or high humidity conditions.

Examples of the monomer that can be used in the present application include a hydroxy group-containing monomer or a carboxyl group-containing monomer, which may be used alone or in combination. Examples of the hydroxy group-containing monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (Meth) acrylate, 2-hydroxyethyleneglycol (meth) acrylate or 2-hydroxypropyleneglycol (meth) acrylate; Examples of the carboxyl group-containing monomer include acrylic acid, methacrylic acid, 2- (meth) acryloyloxyacetic acid, 3- (meth) acryloyloxypropyl acid, 4- (meth) acryloyloxybutyric acid, Butyric acid, itaconic acid, maleic acid, and the like.

The pressure-sensitive adhesive polymer may further include a copolymerizable monomer in addition to the acrylic monomer.

The copolymerizable monomer is not particularly limited as long as it is a copolymerizable monomer. For example, the copolymerizable monomer may include a monomeric polymerization unit capable of forming a homopolymer having a glass transition temperature of 0 ° C or higher.

When the glass transition temperature of a monomer is defined in this specification, its glass transition temperature can refer to the glass transition temperature of the homopolymer when the monomer is polymerized to form a homopolymer. Thus, for example, the term "monomer capable of forming a homopolymer having a glass transition temperature of 0 ° C or higher" may mean that the glass transition temperature of a homopolymer formed by polymerizing only monomers is 0 ° C or higher.

The glass transition temperature of the monomer capable of forming a homopolymer having a glass transition temperature of 0 ° C or higher may be 0 ° C or higher or 5 ° C or higher in another example and the upper limit of the glass transition temperature of the monomer is not particularly limited, 250 ° C, 200 ° C, 150 ° C, or 120 ° C.

But may include various types of copolymerizable monomers without particular limitation as long as the glass transition temperature has the above-mentioned range. For example, methacrylate, tertiary butyl acrylate, tert-butyl methacrylate Butyl acrylate, tert-butyl methacrylate, isobutyl methacrylate, normal-butyl methacrylate, 1-hexadecyl (meth) acrylate, (Meth) acrylates having a straight-chain or branched-chain alkyl group such as methyl methacrylate, n-propyl methacrylate or sec-butyl methacrylate, ; N-alkenylformamide having 2 to 20 carbon atoms, 2 to 16 carbon atoms, 2 to 12 carbon atoms, 2 to 8 carbon atoms, or an alkenyl group having 2 to 4 carbon atoms, such as N-vinylformamide; Acrylamide, N, N-diphenyl (meth) acrylamide, N- (n-dodecyl) (meth) acrylamide, N- (meth) acrylamide such as N, N-dimethyl acrylamide or N-hydroxyethyl acrylamide, N-alkyl (meth) acrylamide (Meth) acrylamide, N, N-dialkyl (meth) acrylamide or N, N-diaryl (meth) acrylamide; Alkoxyalkyl (meth) acrylates such as 2-methoxyethyl (meth) acrylate and the like; Dihydrodicyclopentadienyl acrylate, cyclohexyl (meth) acrylate, benzyl (meth) acrylate, cyclopropyl (meth) acrylate, acrylate, N-naphthyl acrylate, 2-phenoxyethyl (meth) acrylate, phenyl (meth) acrylate, 2- (Meth) acrylate, isobornyl (meth) acrylate, dicyclopentanyl (meth) acrylate or cyclohexyl (meth) acrylate. (Meth) acrylate having a saturated or unsaturated cyclic hydrocarbon group or aromatic group such as cyclohexyl (meth) acrylate and the like; Or styrene may be exemplified.

When the tacky polymer is a copolymerizable monomer and contains a monomer capable of forming a homopolymer having a glass transition temperature of 0 ° C or higher, the tacky polymer may include 40 to 99 parts by weight of an acrylic monomer; And 10 parts by weight to 60 parts by weight of a monomer capable of forming a homopolymer having a glass transition temperature of 0 ° C or higher. In the present specification, the unit " weight part " may mean a ratio of the weight between the respective components. The pressure-sensitive adhesive polymer may further contain 50 parts by weight to 90 parts by weight of an acrylic monomer; And 10 to 50 parts by weight of a monomer capable of forming a homopolymer having a glass transition temperature of 0 占 폚 or higher.

The method for producing the pressure-sensitive adhesive polymer is not particularly limited and can be produced in a usual manner. The sticky polymer is polymerized by, for example, an LRP (Living Radical Polymerization) method. Examples of the polymer include an organic rare earth metal complex as a polymerization initiator, an organic alkali metal compound as a polymerization initiator, and an alkali metal or alkaline earth metal Anion polymerization which is synthesized in the presence of an inorganic acid salt such as a salt, an anionic polymerization method in which an organic alkali metal compound is used as a polymerization initiator and synthesized in the presence of an organoaluminum compound, an atomic transfer radical polymerization (ATRP), Atomic Transfer Radical Polymerization (ATRP), ICAR (Initiators), which conducts polymerization under an organic or inorganic reducing agent that generates electrons using an atom transfer radical polymerization agent as a polymerization initiator for continuous activator regeneration) Atom Transfer Radical Polymerization (ATRP ), A polymerization method (RAFT) using a reversible addition-cleavage chain transfer agent using an inorganic reducing agent addition-cleavage chain transfer agent, or a method using an organic tellurium compound as an initiator. Among these methods, an appropriate method can be selected and applied .

In the present application, an indole-based ultraviolet absorber may be contained in addition to the above-described sticky polymer. The indol ultraviolet absorber blocks blue light, which is a blue light source, and can prevent eye fatigue and dry eye syndrome even if exposed to a monitor, a smart phone, or a TV for a long time.

In one example, the indole-based ultraviolet absorber may be a compound represented by the following formula (1).

[Chemical Formula 1]

R ₁ to R ₅ each independently represent a hydrogen atom, a halogen atom, a hydroxyl group, a carboxyl group, a cyano group, a phenyl group, an aralkyl group, an alkyl group having 1 to 9 carbon atoms, an alkoxy group having 1 to 9 carbon atoms, 9 < / RTI > alkoxycarbonyl group.

Specifically, R ₁ represents an alkyl group having 1 to 4 carbon atoms, R ₂ represents a phenyl group, R ₃ to R ₅ each independently represent a hydrogen atom, a halogen atom, a hydroxyl group, a carboxyl group, a cyano group, BONASORB UA-3901, BONASORB UA-3902, BONASORB UA-3901, BONASORB UA-3902, BONASORB UA-3902, and BONASORB UV absorbers may be used in the present application. 3911, BONASORB UA-3912 or SOM-2-0008, and more specifically, BONASORB UA-3911, BONASORB UA-3912 can be used.

The indole-based ultraviolet ray absorbent may be included in an amount of 0.1 to 10 parts by weight, 0.3 to 5 parts by weight, or 0.5 to 1 part by weight based on 100 parts by weight of the pressure-sensitive adhesive polymer. Excellent blue light blocking effect can be obtained in the above range.

In the present application, the adhesive layer may further include a crosslinking agent capable of crosslinking the adhesive polymer. The cross-linking agent includes at least one functional group capable of reacting with the crosslinkable functional group contained in the tacky polymer, and having 1 to 10, 1 to 8, 1 to 6, or 1 to 4 functional groups Crosslinking agents may be used. As such a cross-linking agent, an appropriate type may be selected and used from among conventional cross-linking agents such as an isocyanate cross-linking agent, an epoxy cross-linking agent, an aziridine cross-linking agent or a metal chelate cross-linking agent considering the kind of the cross-linkable functional group of the adhesive polymer.

Examples of the isocyanate crosslinking agent include diisocyanate compounds such as tolylene diisocyanate, xylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isoboron diisocyanate, tetramethylxylene diisocyanate, and naphthalene diisocyanate; And a reaction product of a polyol such as trimethylolpropane or an isocyanurate adduct of the above diisocyanate compound. Of these, xylene diisocyanate or hexamethylene diisocyanate can be preferably used. As the epoxy crosslinking agent Is preferably at least one selected from the group consisting of ethylene glycol diglycidyl ether, triglycidyl ether, trimethylolpropane triglycidyl ether, N, N, N ', N'- tetraglycidylethylenediamine and glycerin diglycidyl ether There is at least one selected from the group true can be exemplified.

As the aziridine crosslinking agent, N, N'-toluene-2,4-bis (1-aziridinecarboxamide), N, N'-diphenylmethane-4,4'- (2-methyl aziridine) or tri-1-aziridinyl phosphine oxide, and the like, but not limited thereto, and the metal chelate Examples of the crosslinking agent include compounds in which a polyvalent metal such as aluminum, iron, zinc, tin, titanium, antimony, magnesium, and / or vanadium is coordinated to acetylacetone or ethyl acetoacetate.

The crosslinking agent may be contained in an amount of, for example, 0.01 to 10 parts by weight, 0.015 to 5 parts by weight, 0.02 to 2.5 parts by weight or 0.025 to 1 part by weight based on 100 parts by weight of the adhesive polymer . The cross-linking agent may be adjusted to be included in the tacky polymer in the above-mentioned range so that the storage elastic modulus and / or viscosity described below are formed within a desired range.

The adhesive layer may further comprise a silane coupling agent. As the silane coupling agent, for example, a silane coupling agent having a beta-cyano group or an acetoacetyl group can be used. Such a silane coupling agent can make the pressure-sensitive adhesive formed by, for example, a polymer having a low molecular weight exhibit excellent adhesion and adhesion stability.

As the silane coupling agent having a beta-cyano group or an acetoacetyl group, for example, a compound represented by the following formula (1) or (2) can be used.

[Chemical Formula 1]

(R ₁ ) _n Si (R ₂ ) _(4-n)

(2)

(R ₃ ) _n Si (R ₂ ) _(4-n)

Wherein R ₁ is a beta-cyanoacetyl group or a beta-cyanoacetylalkyl group, R ₃ is an acetoacetyl group or an acetoacetylalkyl group, R ₂ is an alkoxy group and n is 1 to 3 &Lt; / RTI >

In the general formula (1) or (2), the alkyl group may be an alkyl group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms or 1 to 4 carbon atoms, and the alkyl group may be linear, branched or cyclic have.

In formula (1) or (2), the alkoxy group may be an alkoxy group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms or 1 to 4 carbon atoms, and the alkoxy group may be linear, branched or cyclic have.

In Formula 1 or 2, n may be, for example, 1 to 3, 1 to 2, or 1.

Examples of the compound represented by the general formula (1) or (2) include acetoacetylpropyltrimethoxysilane, acetoacetylpropyltriethoxysilane, beta-cyanoacetylpropyltrimethoxysilane or beta-cyanoacetylpropyltriethoxysilane But is not limited thereto.

In the adhesive layer, the silane coupling agent may be contained in an amount of 0.01 to 5 parts by weight or 0.01 to 1 part by weight based on 100 parts by weight of the adhesive polymer. Within this range, the storage elastic modulus and / Can be effectively implemented.

The adhesive layer may further include a tackifier as necessary. Examples of the tackifier include a hydrocarbon resin or hydrogenated product thereof, a rosin resin or hydrogenated product thereof, a rosin ester resin or hydrogenated product thereof, a terpene resin or hydrogenated product thereof, a terpene phenol resin or hydrogenated product thereof, Polymerized rosin ester resin, and the like, or a mixture of two or more of them may be used, but the present invention is not limited thereto. The tackifier may be included in the adhesive layer in an amount of 100 parts by weight or less based on 100 parts by weight of the tackifier polymer.

The adhesive layer may further include, if necessary, at least one additive selected from the group consisting of a curing agent, a UV stabilizer, an antioxidant, a colorant, a reinforcing agent, a filler, a defoamer, a surfactant and a plasticizer.

In one example, the adhesive layer may have a coating solid content of at least 20% by weight or at least 25% by weight, if necessary, taking into account the storage elastic modulus and / or viscosity to be described later. As used herein, the term " coating solids " may refer to the solids content of the coating solution at the time the pressure-sensitive adhesive composition is applied to the coating process to form the pressure-sensitive adhesive. Such a coating solid content can be measured, for example, by a commonly known measurement method. Usually, at the time of application to the coating process, the pressure-sensitive adhesive composition, that is, the coating liquid contained in the pressure-sensitive adhesive layer contains the pressure-sensitive adhesive polymer, the crosslinking agent, the initiator and other additives, and may also include a solvent. When the solid content of the coating is 20% by weight or more, the productivity of the pressure-sensitive adhesive or the pressure-sensitive adhesive film to which the pressure-sensitive adhesive is applied can be maximized. The upper limit of the solid content of the coating is not particularly limited and can be appropriately controlled within the range of, for example, 50 wt% or less, 40 wt% or less, or 30 wt% or less, taking into account the viscosity for application to the coating process.

In addition, the adhesive layer may have a gel fraction of 80% by weight or more after implementing the crosslinked structure. The gel fraction can be calculated by the following general formula (1).

[Formula 1]

Gel fraction (%) = B / A X 100

In the general formula (1), A represents the mass of the pressure-sensitive adhesive composition which implements the crosslinked structure, and B represents the mass of the pressure-sensitive adhesive composition of mass A in a net of 200 mesh, This indicates the dry weight of the insoluble fraction collected after immersion.

The gel fraction can be maintained at 80% by weight or more, so that workability and reworkability can be kept excellent, and the storage elastic modulus and / or viscosity to be described later can be suitably realized in a specific range or more.

In one example, the thickness of the adhesive layer may be from 5 탆 to 50 탆, from 10 탆 to 40 탆, or from 20 탆 to 30 탆. By controlling the thickness of the adhesive layer to the above-mentioned range, a sufficient blue light blocking effect can be obtained and the cost for coating the adhesive layer can be reduced.

The anti-scattering film according to the present application comprises a substrate layer;

A first adhesive layer formed on one surface of the substrate layer; And

And a second adhesive layer formed on the other surface of the substrate layer.

In one example, the substrate layer may include a substrate such as a transparent film. The transparent film has excellent strength so as to prevent scattering of glass such as tempered glass of a touch screen panel, It is preferable that a film having a visible light transmittance of 85 to 95% or more and excellent in transparency is used so as not to hinder optical characteristics.

Examples of the film include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polycarbonate (PC), and polypropylene (PP) , And preferably a PET film can be used. However, the present invention is not limited thereto.

In one example, the first adhesive layer comprises a tacky polymer; And an indole-based ultraviolet absorber. The above-mentioned kind of the viscous polymer and the indole based ultraviolet ray absorbent can be used.

Further, in one example, the second adhesive layer may include a silicone-based adhesive. The silicone-based pressure-sensitive adhesives may be conventional silicone pressure-sensitive adhesives used in the art.

The anti-scattering film in the present application may further comprise a transparent base layer formed on the first adhesive layer or the second adhesive layer.

Fig. 1 shows the structure of the anti-scattering film as one example of the present application. 1, the anti-scattering film of the present application comprises a transparent substrate layer 10, a first adhesive layer 20 formed on the transparent substrate layer 10, a substrate layer 20 formed on the first adhesive layer 20, (30), and a second adhesive layer (40) formed on the base layer (30).

In one example, the transparent substrate layer 10 can prevent scratches on a liquid crystal screen and breakage of a liquid crystal screen provided in an electronic device such as a monitor, a smart phone, or a TV. The transparent substrate layer may be glass, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polycarbonate (PC) or polypropylene (PP) PC or PP can be hard coated on one or both sides.

In one example, the first adhesive layer 20 comprises a tacky polymer; And an indole-based ultraviolet absorber. The tacky polymer and the indole-based ultraviolet absorber may be of the kind described above.

Further, the base layer 30 may be the base layer described above, and the second adhesive layer 40 may include a silicone adhesive.

In the present application, the anti-scattering film may further include a protective layer formed on the upper portion of the second adhesive layer.

In this application, Fig. 2 shows a structure in which a protective layer 50 is additionally formed in the anti-scattering film of Fig.

The type of the protective layer 50 is not particularly limited and includes, for example, a cellulose-based film such as TAC (triacetyl cellulose); Polycarbonate film or PET (poly (ethylene terephthalate)); Polyethersulfone-based films; Or a polyolefin film produced by using a polyethylene film, a polypropylene film, a resin having a cyclo or norbornene structure, or an ethylene-propylene copolymer, or the like, or a film having a laminate structure of two or more layers.

The present application also relates to a display device including the aforementioned anti-scattering film. The display device of the present application can prevent fatigue of eyes and dry eye syndrome even if exposed for a long time by including a scattering-preventive film.

The anti-scattering film of the present application may have a blue light blocking effect at a wavelength of about 380 to 500 nm, including an indole ultraviolet absorber. Therefore, even if exposed to monitors, smart phones, TVs for a long time, eye fatigue and dry eye syndrome can be prevented.

1 and 2 are views showing the structure of the anti-scattering film according to one example of the present application.
FIGS. 3 to 6 are graphs showing the transmittance of the anti-scattering film prepared in Examples and Comparative Examples in the region of 200 to 600 nm. FIG.

Hereinafter, the present application will be described in more detail by way of examples according to the present application and comparative examples not complying with the present application, but the scope of the present application is not limited by the following embodiments.

The physical properties in the following examples and comparative examples were evaluated in the following manner.

1. Transmittance measurement

The transmittance of the anti-scattering films prepared in Examples and Comparative Examples was measured using a Shimadzu UV-VIS-NIR spectrophotometer.

The blocking rate was calculated as shown in the following formula 1.

[Formula 2]

Wherein C _λ denotes a blocking rate (%) of a scattering prevention film at λ wavelength (nm), T _G represents the transmittance at λ wavelength (nm) of the glass of 300 μm thickness, T _F is the scattering of the thickness 390 μm (Nm) of the anti-fouling film.

2. Tt measurement

The total light transmittance (Tt) of the anti-scattering film prepared in Examples and Comparative Examples was measured using a Shimadzu UV-VIS-NIR spectrophotometer to a total light transmittance (Tt) spectrum from 700 nm to 200 nm.

3. Haze measurement

The haze of the anti-scattering films prepared in Examples and Comparative Examples was measured according to JIS K 7105-1 standard using a haze meter (COH-400, Nippon Denshoku).

4. Measurement of chromaticity (b)

The chromaticity diagrams (b) of the anti-scattering films prepared in Examples and Comparative Examples were measured according to JIS K 7105 standard using a haze meter (COH-400, Nippon Denshoku).

5. Measurement of yellowing index (YI)

The yellowing index (YI) of the anti-scattering film produced in Examples and Comparative Examples was measured according to JIS K 7105 standard using a haze meter (COH-400, Nippon Denshoku).

Example 1

Production of sticky polymer

50 parts by weight of 2-ethylhexyl acrylate, 40 parts by weight of (meth) acrylate and 2 parts by weight of 2-hydroxyethyl acrylate (HEA) were added to a 1 L reactor equipped with a cooling device, 10 parts by weight. Subsequently, 100 parts by weight of ethyl acetate (EAc) was added with a solvent. Nitrogen gas was purged for oxygen removal for 60 minutes. While maintaining the temperature at 60 占 폚, azobisisobutyronitrile AIBN) was added thereto to initiate the reaction. The reaction product was reacted for about 5 hours and diluted with ethyl acetate (EAc) to prepare a sticky polymer.

Preparation of pressure-sensitive adhesive composition

To 100 parts by weight of the pressure-sensitive adhesive polymer prepared above, 1 part by weight of an indole-based ultraviolet absorber, Bonasorb UA3911, and 0.5 part by weight of "Takenate D110N" (xylene diisocyanate, manufactured by Mitsui Chemicals) as a crosslinking agent were uniformly mixed to obtain a pressure- .

Preparation of shatterproof film

Silicone adhesive was coated on polyethylene terephthalate (PET) treated with double-side primer to a thickness of 20 탆, and then untreated PET was applied. The pressure-sensitive adhesive composition thus prepared was coated and dried on the opposite side coated with the silicone pressure-sensitive adhesive to a thickness of about 20 占 퐉, and then coated with silicon release PET (light release) to produce an adhesive film.

The PET film was peeled off from the produced adhesive film, and the PET film was laminated with a 0.3 T sodalime glass to prepare a shatterproof film.

Example 2

A pressure-sensitive adhesive composition and a light-scattering film were prepared in the same manner as in Example 1 except that the content of Bonasorb UA3911 as an indole ultraviolet absorber was changed to 0.5 parts by weight.

Example 3

A pressure-sensitive adhesive composition and a light-scattering film were prepared in the same manner as in Example 1, except that Bonasorb UA3912 was used as an indole-based ultraviolet absorber.

Comparative Example 1

The pressure-sensitive adhesive composition and the anti-scattering film were prepared in the same manner as in Example 1, except that the indole-based ultraviolet absorber was not used.

Comparative Example 2

A pressure-sensitive adhesive composition and a light-scattering film were prepared in the same manner as in Example 1, except that Tinuvin P, which is a benzotriazole-based blocking agent, was used in place of the indole ultraviolet absorber.

Comparative Example 3

A pressure-sensitive adhesive composition and a light-scattering film were prepared in the same manner as in Example 1, except that Panax Yellow 500, a dye, was used in place of the indole ultraviolet absorber.

Comparative Example 4

A pressure-sensitive adhesive composition and a light-scattering film were prepared in the same manner as in Example 1, except that Panax Y 9, which is a dye, was used instead of the indole ultraviolet absorber.

The physical properties and evaluation results of the above-mentioned Examples and Comparative Examples are shown in Table 1 below.

division Example Comparative Example Glass One 2 3 One 2 3 4 Transmittance (400 nm) 0.6 7.4 2.4 89.3 89.9 3.0 50.6 91.9 Blocking rate (%) (400 nm) 99.3 91.9 97.4 2.8 2.2 96.7 44.9 Tt 91.59 91.66 91.66 91.53 85.78 90.05 88.93 91.23 Hayes 0.51 0.55 0.56 0.47 1.98 0.81 0.46 0.08 b * 6.93 3.90 5.87 0.15 0.50 47.50 42.25 0.19 The modulus of attack (YI) 11.22 6.53 9.59 0.46 0.66 61.62 58.44 0.48

3 to 6 in the present application are graphs showing the transmittance in the region of 200 to 600 nm of the anti-scattering film prepared in Examples and Comparative Examples.

As shown in FIG. 3 to FIG. 6, the shatterproof film of the Example exhibited a low transmittance of 10% or less at around 400 nm, but the glass and the shatterproof films of Comparative Examples 1 and 2 exhibited a high transmittance of 90% , It can be confirmed that the blue light blocking effect of the comparative example is small compared to the examples.

In the case of Comparative Example 3 (FIG. 5), the shrinkage-preventing film of Comparative Example 3 has a high yellowing index of 58%, although it shows a transmittance similar to that of the Example.

In addition, in Comparative Example 4, the transmittance is as high as about 50%.

That is, in the case of the anti-scattering film of the present application, it exhibits excellent blocking properties against 400 nm blue light, thereby preventing eye fatigue or induction of dry eye syndrome.

10: transparent substrate
20: first adhesive layer
30: substrate
40: Second adhesive layer
50: Protective layer

Claims

A base layer; And
And an adhesive layer formed on at least one surface of the substrate layer,
A light-scattering film satisfying the following general formula (1):
[Formula 1]

The anti-scattering film according to claim 1, wherein the blocking ratio is 95% or more.

The anti-scattering film according to claim 1, wherein the yellowing index (YI) is 15% or less.

The adhesive sheet according to claim 1, wherein the adhesive layer
Tacky polymer; And
An anti-scattering film comprising an adhesive layer comprising an indole-based ultraviolet absorber.

The anti-scattering film according to claim 4, wherein the tacky polymer has a weight average molecular weight of 300,000 or more.

The anti-scattering film according to claim 4, wherein the tacky polymer is an acrylic polymer.

The anti-scattering film according to claim 4, wherein the tacky polymer is a polymer derived from a composition containing an acrylic monomer.

The anti-scattering film according to claim 4, wherein the indole-based ultraviolet absorber is a compound represented by the following formula (1):
[Chemical Formula 1]

R ₁ to R ₅ each independently represent a hydrogen atom, a halogen atom, a hydroxyl group, a carboxyl group, a cyano group, a phenyl group, an aralkyl group, an alkyl group having 1 to 9 carbon atoms, an alkoxy group having 1 to 9 carbon atoms, Alkoxycarbonyl group having 1 to 9 carbon atoms.

10. The method of claim 8 wherein, R ₁ represents an alkyl group having 1 to 4, R ₂ represents a phenyl group, R ₃ to R ₅ each independently represent a hydrogen atom, a halogen atom, a hydroxyl group, a carboxyl group, a cyano group, a phenyl group, an aralkyl An alkyl group, an alkyl group having 1 to 9 carbon atoms, an alkoxy group having 1 to 9 carbon atoms, or an alkoxycarbonyl group having 1 to 9 carbon atoms.

The anti-scattering film according to claim 4, wherein the indole-based ultraviolet absorber is contained in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the adhesive polymer.

The method of claim 1, further comprising: providing a substrate layer;
A first adhesive layer formed on one surface of the substrate layer; And
And a second adhesive layer formed on the other surface of the substrate layer,
The first adhesive layer comprises a tacky polymer; And an indole-based ultraviolet absorber.

The anti-scattering film according to claim 11, wherein the second adhesive layer comprises a silicone-based adhesive.

The anti-scattering film according to claim 11, further comprising a transparent base layer formed on the first adhesive layer or the second adhesive layer.

The anti-scattering film according to claim 13, wherein the transparent substrate layer is glass, polyethylene terephthalate, polyethylene naphthalate, polyethersulfone, polycarbonate or polypropylene.

A display device comprising the anti-scattering film according to claim 1.