KR101374366B1 - Optical film and display filter using the same - Google Patents

Abstract

The present invention relates to an acrylonitrile-butadiene-styrene resin containing a specific range of butadiene monomer, to obtain a near-infrared ray blocking effect and color correction effect, and to an optical film having a high light transmittance and a display filter using the same. .

Description

Optical film and display filter using the same}

The present invention relates to an optical film and a display filter using the same. More specifically, the present invention by introducing an acrylonitrile-butadiene-styrene resin containing a butadiene monomer in a specific content, it is possible to obtain a near-infrared ray blocking effect and color correction effect, and together with an optical film having a good light transmittance and a display using the same It is about a filter.

2. Description of the Related Art In recent years, a plasma display panel has attracted a great deal of attention in realizing a large screen of a flat panel display. The plasma display panel assembly includes barrier ribs formed on a lower plate, a red and green fluorescent layer formed on the ribs of the barrier ribs, an upper plate overlapped with the lower plate electrode so as to be parallel to each other, A discharge gas such as Ne, Ar, or Xe is sealed and a voltage is applied to the electrodes of the positive and negative electrodes to combine the light generated when ultraviolet rays radiated from the plasma generated when the gas is discharged, It is a next generation display that provides images.

On the other hand, the plasma display panel (PDP) filter compensates for the deterioration of the purity of the red spectrum due to the unique orange spectrum emitted from the PDP panel, and shields electromagnetic waves harmful to the human body and near infrared rays causing malfunction of the remote controller. In order to fulfill this role, the PDP filter is made up of layers having respective functions such as an antireflection layer, a color correction layer for correcting color purity, a near infrared absorbing layer, and an electromagnetic wave shielding layer.

In particular, the near-infrared absorbing layer absorbs a large amount of near-infrared rays emitted from the plasma display, thereby preventing the near-infrared from malfunctioning not only in the plasma display itself but also in remote controllers of other household appliances. In addition, the color correction layer serves to improve the contrast and color reproducibility of the PDP image by correcting the purity of the color.

Conventionally, by using the near-infrared absorbing layer and the color correction layer as separate layers, the thickness of the filter has been increased, which may add additional cost and process. However, when the near-infrared absorbing dye used for the near-infrared absorbing layer and the dye used for the color correction layer are mixed to form a single film, the light transmittance may not be good depending on the resin used as the substrate of the film, and thus may not be used as an optical film. have.

Therefore, there is a need to develop an optical film having good light transmittance while having a near infrared absorption effect and a color correction effect.

An object of the present invention is to provide an optical film having both a near infrared absorption effect and a color correction effect.

Another object of the present invention is to provide an optical film having good light transmittance with near infrared absorption effect and color correction effect.

Still another object of the present invention is to provide a display filter including the optical film.

The optical film of the present invention comprises acrylonitrile-butadiene-styrene resin, 380-750nm absorbing dye and 900-1100nm absorbing dye, the content of butadiene in the acrylonitrile-butadiene-styrene resin is 5-50% by weight Can be.

In one embodiment, the content of butadiene can be 20-45% by weight.

In one embodiment, the content of acrylonitrile in the acrylonitrile-butadiene-styrene resin may be 1-9% by weight.

In one embodiment, the 380-750 nm absorbing dye may be included in an amount of 0.05-20 parts by weight based on 100 parts by weight of the acrylonitrile-butadiene-styrene resin.

In one embodiment, the 900-1100nm absorbing dye may be included in an amount of 0.01-30 parts by weight based on 100 parts by weight of the acrylonitrile-butadiene-styrene resin.

In one embodiment, the 380-750 nm absorbing dye: 900-1100 nm absorbing dye may be included in a weight ratio of 1:10 to 1:30.

The present invention provides a display filter comprising the optical film.

The present invention provides an optical film having both a near infrared absorption effect and a color correction effect. In addition, the present invention provides an optical film having a good light transmittance with a near infrared absorption effect and a color correction effect. The present invention also provides a display filter comprising the optical film.

In one aspect, the optical film of the present invention may include acrylonitrile-butadiene-styrene (ABS) resin, 380-750 nm absorbing dye and 900-1100 nm absorbing dye, and the content of butadiene in ABS resin is 10-50% by weight. Can be

Acrylonitrile-butadiene-styrene resin

Acrylonitrile butadiene styrene (ABS) resin is a resin in which butadiene rubber particles are dispersed in a matrix of acrylonitrile and styrene. The rubber particles function to absorb and disperse external impact on the optical film. In addition, it is possible to maintain transparency by controlling the optical properties of the entire resin through the size and structure control of the rubber particles.

The average particle diameter of the rubber particles is preferably 0.5 μm or less for the transparency of the ABS resin. Within this range, the transmittance of the ABS resin can be used as the resin to the optical film by maintaining 90% or more. Preferably 0.1-0.4 micrometers is good.

It is preferable that the transmittance | permeability of ABS resin is 90% or more, and haze is 2% or less.

ABS resin can be prepared by grafting acrylonitrile monomer and styrene monomer on butadiene rubber. The manufacturing method of ABS resin can be manufactured according to a conventional method. The content of butadiene rubber in the ABS resin may be 5-50% by weight. If the content of butadiene rubber is less than 10% by weight, the transmittance can be secured to 90% or more, but the impact resistance may drop. If the content of butadiene rubber is more than 50% by weight, the haze may increase by 2% or more, resulting in a decrease in the light transmittance. Preferably, the content of butadiene rubber may be 20-45% by weight.

The content of acrylonitrile monomer in the ABS resin may be 1-9% by weight. Within this range, the optical film may have a light transmittance of 90% or more and a haze of 2% or less.

The content of styrene monomer in the ABS resin may be 41-94% by weight. Within this range, the optical film may have a light transmittance of 90% or more and a haze of 2% or less.

The weight average molecular weight of the ABS resin may be 10,000 ~ 1,000,000g / mol, the glass transition temperature may be 80-130 ℃.

The ABS resin may be included in 50-99.99 parts by weight of 100 parts by weight of the optical film. Within this range, the durability of the produced film may be good and both the near infrared absorption effect and the color correction effect may come out.

The ABS resin may further include another kind of resin used as a substrate of the optical film. For example, styrene butadiene styrene copolymer resin (SBS resin), styrene butadiene copolymer resin (SBC resin) alone or the copolymer and ethylene vinyl acetate (EVA), ethylene ethyl acrylate (EEA), olefin, polycarbonate, Resin excellent in optical characteristics, such as an acrylic copolymer and poly methacrylate, can be used.

In the optical film of the present invention, 380-750 nm absorbing dye and 900-1100 nm absorbing dye may be included as 0.01-50 parts by weight of 100 parts by weight of the optical film.

380-750 nm  Absorbing dye

380-750 nm absorbing dyes are dyes having a maximum absorption wavelength in the 380-750 nm region. By using such dyes, color correction effects can be produced in plasma displays.

The 380-750 nm absorbing dye may be included in an amount of 0.05-20 parts by weight based on 100 parts by weight of the ABS resin. Within this range, even in the presence of 900-1100 nm absorbing dye can exhibit a color correction effect and light transmittance can be improved. Preferably, it may be included in 0.1-1 parts by weight.

The 380-750 nm absorbing dye may be used without limitation as a dye having an absorption wavelength in the 380-750 nm region, which is commonly used in the art. For example, it may be one or more selected from the group consisting of porphyrin-based compounds, cyanine-based compounds, and arylmethine-based compounds, but is not limited thereto. In the present invention, one or more pigments of the 380-750 nm absorbing dye may be used.

Preferred examples of the 380-750 nm absorbing dye may be a porphyrin-based compound of Formula 1 or a cyanine-based compound of Formula 2 or 3.

≪ Formula 1 >

Wherein R 1 -R 8 are each independently hydrogen, halogen, substituted or unsubstituted C 1 -C 16 alkyl group, substituted or unsubstituted C 6 -C 16 aryl group, substituted or unsubstituted C 1 A pentagonal ring having from 1 to 16 alkoxy groups, substituted or unsubstituted 6 to 16 aryloxy groups, and one or more substituted or unsubstituted nitrogen atoms, and the substituents are halogen, alkyl having 1 to 5 carbon atoms , An alkoxy group having 1 to 5 carbon atoms, an aryloxy group having 6 to 10 carbon atoms, an alkylamino group having 1 to 16 carbon atoms,

M may be a divalent to tetravalent metal atom coordinated with two hydrogen, oxygen, halogen, or hydroxy groups, or an uncoordinated metal atom.)

(2)

(3)

Wherein each R is independently hydrogen, an aliphatic hydrocarbon having 1 to 30 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an aryl group having 6 to 30 carbon atoms,

X and Y are each independently a nitro group, a carboxyl group, an alkoxy group having 2 to 8 carbon atoms, a phenoxycarbonyl group, a carboxylate group, an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms or 6 carbon atoms To 30 aryl groups,

M may be a divalent to tetravalent metal atom coordinated with two hydrogen, oxygen, halogen, or hydroxy groups, or an uncoordinated metal atom.)

900-1100 nm  Absorbing dye

The 900-1100 nm absorbing dye is a dye having the maximum absorption wavelength in the 900-1100 nm region. By using such dyes, the light transmittance in the 900-1100 nm region generated in the plasma display becomes 30% or less, thereby making it possible to more stably block near infrared rays. This also makes it possible to prevent a malfunction of the remote controller.

The 900-1100 nm absorbing dye may be included in an amount of 0.01-30 parts by weight based on 100 parts by weight of the ABS resin. Within this range, near-infrared rays can be stably blocked even in the presence of 380-750 nm absorbing dye, and malfunction of the remote controller can be prevented. Preferably, it may be included in 0.1-1 parts by weight.

The 900-1100 nm absorbing dye is a dye exhibiting an absorption wavelength in the 900-1100 nm range can be used without limitation, those conventionally used in the art. For example, it may be one or more selected from the group consisting of diimmonium compounds, polymethine compounds, anthraquinone compounds, phthalocyanine compounds, naphthalocyanine compounds, thiol nickel complexes, but is not limited thereto. In the present invention, one or more pigments of the 900-1100 nm absorbing dye may be used.

Specific examples of the 900-1100 nm absorbing dye include a diimmonium compound of Formula 4, a thiol nickel complex of Formula 5, a polymethine compound of Formula 6, an anthraquinone compound of Formula 7, phthalocyanine of Formula 8, or Phthalocyanine series etc. are mentioned.

≪ Formula 4 >

Wherein R 1 -R 8 are each independently a linear or branched alkyl group having 1 to 10 carbon atoms; 1 to 10 linear or minute carbon atoms substituted with hydroxy, cyano or 1 to 5 alkoxy groups Topographic alkyl groups; C6-C12 aryl groups; C6-C12 aryl groups substituted by halogen, C1-C5 alkyl groups or dialkylamino groups; C2-C6 alkenyl groups; or Benzyl groups , Aralkyl such as fluorobenzyl group, chlorophenyl group, phenylpropyl group, naphthylethyl group,

R9-R12 are each independently hydrogen, halogen, diethylamino group, dimethylamino group, cyano group, nitro group, alkyl group having 1 to 6 carbon atoms, trifluoromethyl group, alkoxy group having 1 to 5 carbon atoms,

X- is halogen, RCO2-, RSO3-, NO3-, ClO4-, PF6-, SbF6-, BF4-, BR4-,. Tf2N-, wherein R is an alkyl or aryl group having 1 to 10 carbon atoms).

≪ Formula 5 >

(6)

Wherein each R is independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylalkoxy group having 1 to 10 carbon atoms, an alkylsulfonate group having 1 to 10 carbon atoms, and X- is a halogen anion as an anion, R 1 CO 2- , R1SO3-, NO3-, ClO4-, PF6-, SbF6-, BF4-, BR4-, Tf2N-, wherein R1 is an alkyl or aryl group having 1 to 10 carbon atoms.)

≪ Formula 7 >

(Wherein R1 to R8 are hydrogen atoms or alkyl groups having 1 to 10 carbon atoms)

(8)

≪ Formula 9 >

Wherein R 1 to R 3 are hydrogen, a hydroxy group, an amino group, a hydroxysulfonyl group, an aminosulfonyl group, or an alkyl group having 1 to 20 carbon atoms,

M is two hydrogen atoms, divalent metal atoms, trivalent or tetravalent substituted metal atoms, tin dope indium oxide or antimonium dope tin oxide)

The content of the 900-1100 nm absorbing dye and the 380-750 nm absorbing dye in the optical film may be properly adjusted for the near infrared ray blocking effect, the color correction effect and the light transmittance improvement effect.

For example, the 380-750 nm absorbing dye: 900-1100 nm absorbing dye may be included in a weight ratio of 1:10 to 1:30. Within this range, all of the near infrared ray blocking effect, the color correction effect, and the light transmittance improvement effect may appear. Preferably, the 380-750 nm absorbing dye: 900-1100 nm absorbing dye may be included in a weight ratio of 1:15 to 1:25.

In addition to the above-mentioned dyes, the optical film of the present invention may include a metal oxide and the like, and examples of the metal oxide include tin-doped indium oxide, antimonium-doped tin oxide, and the like.

The optical film of the present invention may be prepared by coating a base film with a composition comprising an acrylonitrile-butadiene-styrene (ABS) resin, a 380-750 nm absorbing dye, a 900-1100 nm absorbing dye, and a residual organic solvent.

The organic solvent may include one or more selected from the group consisting of methyl ethyl ketone, methyl isobutyl ketone, acetone, cyclohexanone, cyclopentanone, dioxolane, dioxin, dimethoxyethane, toluene, and xylene. Can be, but is not limited to these.

Although it does not restrict | limit especially as a base film, It has transparency and consists of polyester type, acryl type, cellulose type, polyethylene type, polypropylene type, polyolefin type, polyvinyl chloride type, polycarbonate type, phenol type, urethane type resin, etc. Films can be used. The coating method may use one or more methods selected from the group consisting of a die coater, gravure coater, micro gravure coater, reverse coater, knife coater and comma coater.

The optical film of the present invention may have a light transmittance of 70% or more and a haze of 2% or less.

The display filter of the present invention may include the optical film. The display filter may be, but not limited to, a plasma display. The optical film may block electromagnetic waves in the near infrared region to prevent malfunction of the remote controller and may have a color correction effect as well as a light transmittance effect, thereby increasing the utility of the display filter.

Hereinafter, the configuration and operation of the present invention through the preferred embodiment of the present invention will be described in more detail. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

Details that are not described herein will be omitted since those skilled in the art can sufficiently infer technically.

Specific specifications of the components used in the following examples and comparative examples are as follows.

1) ABS resin

A: Cheil Industries' UT-0350 having a butadiene content of 10% by weight was used.

B: Cheil Industries' UT-0350 with a butadiene content of 30% by weight was used.

C: Cheil Industries' UT-0350 having a butadiene content of 50% by weight was used.

D: Cheil Industries' UT-0350 having a butadiene content of 5% by weight was used.

E: Cheil Industries HF-5661HB SAN resin was used.

F: Cheil Industries' UT-0350 having a butadiene content of 70% by weight was used.

2) 380-750 nm absorbing dye: SK-d593 from SK-Chemical, a porphyrin pigment, was used.

3) 900-1100 nm absorbing dye: CIR-1085 manufactured by Nippon Shokubai, which is a diimmonium dye, was used.

Example  1-4

17 g of an ABS resin (average particle diameter: 0.5 µm) was dissolved in methyl ethyl ketone, which was a solvent, was prepared as a resin solution having a solid content of 40%, and then mixed with 8 g of methyl ethyl ketone, and stirred sufficiently to prepare 25 g of a coating solution (ABS resin in the coating liquid). Content of 6.8g). 0.01 g of 380-750 nm absorbent dye and 0.2 g of 900-1100 nm absorbent dye were added to the coating solution, and the mixture was sufficiently stirred until dissolved. The prepared coating solution was coated on a polyethylene terephthalate film (A4300, Toyobo Co., Ltd.) having a thickness of 20 μm and dried at 80 ° C. for 1 minute to obtain an optical film.

Comparative Example  1-2

The same method was followed except that the kind of ABS resin and 380-750 nm absorbing dye alone or 900-1100 nm absorbing dye alone were used, and the optical film was obtained.

Table 1 shows the specifications of the optical film produced above.

<Table 1>

Experimental Example : Evaluation of Physical Properties of Optical Film

The following physical properties of the optical films prepared in Examples and Comparative Examples were evaluated, and the results are shown in Table 2 below.

&Lt; Property evaluation method &

1) Maximum Absorption Wavelength: The optical film prepared in comparison with the above Example was measured by light transmittance with a spectrometer (Perkin-Elmer, Lamda 950 spectrometer) to obtain the maximum absorption wavelength.

2) Light transmittance: The optical transmittances of the optical films prepared in Examples and Comparative Examples were measured with a spectrometer (Lakin 950 spectrometer, Perkin-Elmer).

3) Haze: Haze was measured by the Haze measuring device (NIPPON DENCHI Co., NDH-2000) of the optical films prepared in Examples and Comparative Examples.

<Table 2>

As shown in Table 2, it can be seen that the optical film of the present invention has a light transmittance of 70% or more and a haze of 2% or less. On the other hand, Comparative Example 1-2 using SAN resin in the optical film or ABS resin containing 70% by weight of butadiene content in excess of 50% by weight has a haze of 3.8, 4.5, although the light transmittance is 90% or more. As a%, it is not good.

Claims (12)

Acrylonitrile-butadiene-styrene resin, 380-750 nm absorbing dye and 900-1100 nm absorbing dye,
The butadiene content of the acrylonitrile-butadiene-styrene resin is 5-50% by weight, the content of acrylonitrile is 1-9% by weight, and the content of styrene is 41-94% by weight.
The optical film of claim 1, wherein the butadiene content is 20-45 wt%.
delete The optical film according to claim 1, wherein the average particle diameter of butadiene rubber particles in the acrylonitrile-butadiene-styrene resin is 0.5 µm or less.
The optical film of claim 1, wherein the acrylonitrile-butadiene-styrene resin has a transmittance of 70% or more.
The optical film according to claim 1, wherein the haze of the acrylonitrile-butadiene-styrene resin is 2% or less.
The optical film of claim 1, wherein the 380-750 nm absorbing dye is included in an amount of 0.05-20 parts by weight based on 100 parts by weight of the acrylonitrile-butadiene-styrene resin.
The optical film of claim 1, wherein the 900-1100 nm absorbing dye is included in an amount of 0.01-30 parts by weight based on 100 parts by weight of the acrylonitrile-butadiene-styrene resin.
The optical film of claim 1, wherein the 380-750 nm absorbing dye: the 900-1100 nm absorbing dye is included in a weight ratio of 1:10 to 1:30.
The optical film according to claim 1, wherein the 380-750 nm absorbing dye is at least one selected from the group consisting of porphyrin-based compounds, cyanine-based compounds and arylmethine-based compounds.
The method of claim 1, wherein the 900-1100 nm absorbing dye is at least one selected from the group consisting of diimmonium compounds, polymethine compounds, anthraquinone compounds, phthalocyanine compounds, naphthalocyanine compounds and thiol nickel complexes. An optical film characterized by the above-mentioned.
12. A display filter comprising the optical film of any one of claims 1, 2 and 4-11.