KR20030041459A - Light diffusion film - Google Patents

Light diffusion film Download PDF

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KR20030041459A
KR20030041459A KR1020010072260A KR20010072260A KR20030041459A KR 20030041459 A KR20030041459 A KR 20030041459A KR 1020010072260 A KR1020010072260 A KR 1020010072260A KR 20010072260 A KR20010072260 A KR 20010072260A KR 20030041459 A KR20030041459 A KR 20030041459A
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film
light diffusing
light
parts
weight
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KR1020010072260A
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Korean (ko)
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이정만
김정환
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이정만
김정환
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/02Diffusing elements; Afocal elements
    • G02B5/0205Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04Coating
    • C08J7/042Coating with two or more layers, where at least one layer of a composition contains a polymer binder
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00Compositions of unspecified macromolecular compounds
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D201/00Coating compositions based on unspecified macromolecular compounds
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/02Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of crystals, e.g. rock-salt, semi-conductors
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00Properties
    • C08L2201/10Transparent films; Clear coatings; Transparent materials
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00Applications
    • C08L2203/16Applications used for films

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Organic Chemistry (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Dispersion Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Laminated Bodies (AREA)

Abstract

PURPOSE: Provided is a photodiffusion film which is adhered to a substrate film well with showing excellent light permeability so that it diffuses light source caused from LED in spite of short distance between a display panel and an LED source. CONSTITUTION: The photodiffusion film is characterized by comprising the parts of: a transparent polymer substrate film(1); and a photodiffusion layer(3) which is formed at one side or both sides of the polymer substrate film and consists of not less than 100wt% of one binder resin selected from acryl resins, urethane resins, polyester resins, epoxy resins, acryl resins with more than two acryl groups in one molecule or those compound and 20-50wt% of inorganic particles with 2-4micrometer in average granularity.

Description

광확산필름{Light diffusion film}Light diffusion film

본 발명은 광확산필름에 관한 것으로서, 보다 상세하게는 발광다이오드(light emitting diode ; 이하 LED) 광원에서 유래하는 광을 확산시키는데 사용되는 광확산필름에 관한 것이다.The present invention relates to a light diffusing film, and more particularly, to a light diffusing film used to diffuse light from a light emitting diode (LED) light source.

최근 폴리에스테르 필름에 각각의 용도에 맞는 무기 또는 유기 입자와 바인더 수지를 포함하는 조성물을 도포하여 제조된 복합필름이 포장용 필름, 사진용 필름, 라벨용 필름, 전기자기용 필름, 광학용 필름 등으로 사용되고 있다.Recently, a composite film prepared by applying a composition containing inorganic or organic particles and a binder resin suitable for each purpose to a polyester film is used as a packaging film, a photographic film, a label film, an electromagnetic film, an optical film, and the like. It is used.

정보통신분야의 화상표시소자에서도 이러한 필름이 이용되고 있는데, 화상표시소자의 디스플레이 패널에 부착되어 LED 광원 등에서 유래된 광을 균일하게 확산시키고 휘도를 높여주는 효과를 발휘하는 광확산필름이 개발되어 사용되고 있다.Such films are also used in image display devices in the field of information and communication. A light diffusion film is developed and used to attach to a display panel of an image display device to uniformly diffuse light derived from an LED light source and increase brightness. have.

그러나 최근에는 전자제품의 소형화가 진행됨에 따라 디스플레이 패널과 LED 광원과의 사이가 가까워지면서 종래의 광확산필름으로는 LED에서 유래된 광을 고르게 확산시키는데 어려움에 직면하였다.However, in recent years, as miniaturization of electronic products has progressed, the display panel is closer to the LED light source, and thus, conventional light diffusing films have faced difficulties in evenly spreading the light derived from the LED.

따라서, 본 발명이 이루고자 하는 기술적 과제는 종래의 광확산필름의 문제점을 개선하여 기재 필름과의 밀착력이 우수하고 광투과율도 20 ~ 80%로 우수하여 디스플레이 패널과 LED 광원과의 사이가 가까워도 LED 광원에서 유래된 광원을 고르게 확산시킬 수 있는 광확산필름을 제공하는데 있다.Therefore, the technical problem to be achieved by the present invention is to improve the problem of the conventional light diffusing film, excellent adhesion to the base film and excellent light transmittance of 20 to 80%, even if the display panel and the LED light source close to the LED An object of the present invention is to provide a light diffusion film capable of uniformly diffusing a light source derived from a light source.

도 1은 기재필름의 일면에 광확산층이 적층된 본 발명의 제1 태양에 따른 광확산필름의 단면도이다.1 is a cross-sectional view of a light diffusing film according to a first aspect of the present invention in which a light diffusing layer is stacked on one surface of a base film.

도 2는 기재필름의 양면에 광확산층이 적층된 본 발명의 제2 태양에 따른 광확산필름의 단면도이다.2 is a cross-sectional view of a light diffusing film according to a second aspect of the present invention in which a light diffusing layer is laminated on both surfaces of a base film.

<도면의 주요부호에 대한 설명><Description of Major Symbols in Drawing>

1 : 투명한 고분자 기재필름 3, 3' : 광확산층1: transparent polymer base film 3, 3 ': light diffusion layer

5 : 인쇄층 7 : 보호필름층5: printed layer 7: protective film layer

9 : 이형필름층9: release film layer

상기 기술적 과제를 달성하기 위하여 본 발명은 투명한 고분자 기재필름; 및The present invention to achieve the above technical problem is a transparent polymer base film; And

상기 고분자 기재 필름의 일면 또는 양면에 형성된 광확산층으로서, 아크릴계 수지, 우레탄계 수지, 폴리에스테르계 수지, 에폭시계 수지, 하나의 분자중에 2개 이상의 아크릴기를 포함하는 아크릴계 수지 또는 이들의 혼합물에서 선택된 하나 이상의 바인더 수지와 상기 바인더 수지 100 중량부를 기준으로 평균입경은 2 ~ 4㎛의 무기입자 20 ~ 50중량부를 함유하는 광확산층을 포함하는 것을 특징으로 광확산필름을 제공한다.Light diffusion layer formed on one side or both sides of the polymer substrate film, at least one selected from acrylic resin, urethane resin, polyester resin, epoxy resin, acrylic resin containing two or more acrylic groups in one molecule or mixtures thereof The binder resin and the average particle diameter based on 100 parts by weight of the binder resin provide a light diffusion film comprising a light diffusion layer containing 20 to 50 parts by weight of inorganic particles having a thickness of 2 to 4 μm.

본 발명에 따른 광확산필름에 있어서, 상기 광확산층의 두께는 3 ~ 20g/m2인 것이 바람직하다.In the light diffusion film according to the present invention, the thickness of the light diffusion layer is preferably 3 to 20 g / m 2 .

본 발명에 따른 광확산필름에 있어서, 상기 광확산필름의 광투과율은 20 ~ 80%인 것이 바람직하다.In the light diffusing film according to the present invention, the light transmittance of the light diffusing film is preferably 20 to 80%.

본 발명에 따른 광확산필름에 있어서, 상기 무기입자는 이산화티탄, 실리카, 탄산칼슘, 유리, 황산바륨, 삼산화안티몬, 알루미나 또는 이들의 혼합물에서 선택된 하나 이상인 것이 바람직하다.In the light diffusion film according to the present invention, the inorganic particles are preferably at least one selected from titanium dioxide, silica, calcium carbonate, glass, barium sulfate, antimony trioxide, alumina or mixtures thereof.

본 발명에 따른 광확산필름에 있어서, 상기 광확산층은 열경화성 경화제를 상기 바인더수지 100 중량부를 기준으로 20 ~ 50중량부를 더 포함하는 것이 바람직하다.In the light diffusion film according to the present invention, the light diffusion layer preferably further comprises 20 to 50 parts by weight of the thermosetting curing agent based on 100 parts by weight of the binder resin.

본 발명에 따른 광확산필름은 기재 필름과의 밀착력이 우수하고 광투과율도 20 ~ 80%로 우수하여 디스플레이 패널과 LED 광원과의 사이가 가까워도 LED 광원에서 유래된 광원을 고르게 확산시킬 수 있는 특징이 있다.The light diffusing film according to the present invention has excellent adhesion with the base film and excellent light transmittance of 20 to 80%, so that the light source derived from the LED light source can be evenly diffused even when the display panel is close to the LED light source. There is this.

이하 본 발명에 따른 광확산필름에 대하여 상세히 설명한다.Hereinafter, the light diffusing film according to the present invention will be described in detail.

도 1은 기재필름의 일면에 광확산층이 적층된 본 발명의 제1 태양에 따른 광확산필름의 단면도이다.1 is a cross-sectional view of a light diffusing film according to a first aspect of the present invention in which a light diffusing layer is stacked on one surface of a base film.

도 1을 참조하면, 본원발명의 제1 태양의 광확산필름은 투명한 고분자 기재필름(1)상에 광확산층(3), 인쇄층(5) 및 보호필름층이 차례로 적층된 형태로 제조된다. 고분자 기재필름(1)의 하부면에는 이형필름층(9)이 부착되어 있는데, 본 발명의 광확산필름을 디스플레이 패널상에 부착할 때에는 이형필름층(9)을 제거한 후디스플레이 패널에 적용하게 된다. 고분자 기재필름(1)의 하부면에는 접착제(미도시)가 부착되어 있어서 디스플레이 패널에의 부착을 용이하게 한다.Referring to FIG. 1, the light diffusing film of the first aspect of the present invention is manufactured in a form in which a light diffusing layer 3, a printing layer 5, and a protective film layer are sequentially stacked on a transparent polymer base film 1. The release film layer 9 is attached to the lower surface of the polymer base film 1, and when the light diffusing film of the present invention is attached on the display panel, the release film layer 9 is removed and then applied to the display panel. . An adhesive (not shown) is attached to the lower surface of the polymer base film 1 to facilitate attachment to the display panel.

도 1을 다시 참조하면, 디스플레이 패널상에 광확산필름이 부착되어 사용될 때 LED 광원 등에서 발산된 백 라이트가 투명한 고분자 기재필름(1)을 통과하여 광확산층(3)에 입사된 후, 이 광확산층(3)내에 균일하게 분산되어 존재하는 무기입자에 의해 산란되어 광이 균일하게 분산되어 통과하게 된다. 이에 따라 디스플레이 패널을 바라보는 사람은 빛의 확산 작용 때문에 디스플레이 화면의 화상을 균일한 조도로 느끼게 된다.Referring back to FIG. 1, when a light diffusing film is attached to a display panel and used, a backlight emitted from an LED light source passes through the transparent polymer base film 1 and enters the light diffusing layer 3, and then the light diffusing layer. It is scattered by the inorganic particles which are uniformly dispersed in (3), and light is uniformly dispersed and passes through. Accordingly, a person looking at the display panel feels an image of the display screen with uniform illuminance due to light diffusion.

본 발명에서 사용되는 고분자 기재필름(1)으로는 투명한 유기고분자 필름이라면 특별히 한정되지 않지만 투명성, 치수안정성, 내흡습성, 우수한 기계적 강도를 갖는 2축연신된 폴리에틸렌테레프탈레이트, 폴리트리메틸렌테레프탈레이트, 폴리부틸렌테레프탈레이트, 폴리나프탈렌테레프탈레이트 등의 폴리에스테르 필름이 바람직하다.The polymer base film 1 used in the present invention is not particularly limited as long as it is a transparent organic polymer film. Polyester films, such as butylene terephthalate and a polynaphthalene terephthalate, are preferable.

이밖에 폴리카보네이트 필름, 폴리프로필렌 필름, 폴리에틸렌 필름, 아크릴 필름, 아세틸셀룰로오스 필름, 폴리비닐클로라이드 필름 등도 사용될 수 있다.In addition, polycarbonate film, polypropylene film, polyethylene film, acrylic film, acetyl cellulose film, polyvinyl chloride film and the like can also be used.

상기 고분자 기재필름의 두께는 특별히 한정되지 않으나 통상적으로 15 ~ 600㎛인 것이 바람직하며, 더욱 바람직하게는 30 ~ 300㎛인 것이 바람직하다.Although the thickness of the polymer base film is not particularly limited, it is preferably 15 to 600 μm, and more preferably 30 to 300 μm.

본 발명의 특징을 이루는 광확산층(3)은 용매에 바인더수지, 무기입자가 균일하게 분산된 광확산층 형성용 조성물을 기재필름(1)상에 메이어 바 등을 이용하여 균일한 두께로 도포하여 형성된다.The light diffusing layer 3, which is a feature of the present invention, is formed by coating a light diffusing layer forming composition in which a binder resin and inorganic particles are uniformly dispersed in a solvent on a base film 1 using a mayer bar or the like. do.

본 발명에서 사용되는 바인더 수지로는 1종의 바인더 수지를 단독으로 사용하거나 또는 2종 이상의 바인더 수지를 혼합하여 사용할 수 있으나, 기재필름과의 밀착성, 투명성, 코팅작업성 등을 고려하여 선정되어야 한다. 바람직한 바인더 수지는 아크릴계 수지, 우레탄계 수지, 폴리에스테르계 수지, 또는 에폭시계 수지가 있으며, 하나의 분자중에 2개 이상의 아크릴기를 포함하여 가교경화될 수 있는 아크릴계 바인더 수지, 예를 들면 폴리에스테르계 아크릴레이트, 우레탄계 아크릴레이트, 에폭시계 아크릴레이트 등 열 및/또는 자외선에 의하여 가교경화될 수 있는 것도 사용될 수 있다.As the binder resin used in the present invention, one kind of binder resin may be used alone or two or more kinds of binder resins may be mixed, but should be selected in consideration of adhesion to the base film, transparency, coating workability, and the like. . Preferred binder resins include acrylic resins, urethane resins, polyester resins, or epoxy resins, and acrylic binder resins, such as polyester acrylates, which can be crosslinked and cured by including two or more acrylic groups in one molecule. A urethane acrylate, an epoxy acrylate, or the like, which may be crosslinked by heat and / or ultraviolet rays, may also be used.

이밖에 상기 광확산층용 조성물은 2이상의 이소시아네이트기를 포함하는 폴리이소시아네이트계 화합물, 킬레이트 화합물 등의 경화제를 더 포함할 수 있는데, 이 경우에는 광확산층의 밀착성, 도막강도 등의 특성이 향상되는 효과가 있다.In addition, the light diffusing layer composition may further include a curing agent such as a polyisocyanate compound, a chelate compound, or the like containing two or more isocyanate groups, in which case, there is an effect of improving the properties such as adhesion of the light diffusing layer, coating film strength and the like. .

본 발명의 광확산층에 포함되는 확산제인 무기입자는 바인더 수지내에서의 분산성, 바인더수지와의 밀착력, 투과율, 코팅작업성, 코팅외관의 미려함 등을 고려하여 선정되는데, 이산화티탄, 실리카, 탄산칼슘, 유리, 황산바륨, 삼산화안티몬, 알루미나 등이 사용될 수 있다.Inorganic particles, which are diffusing agents included in the light diffusing layer of the present invention, are selected in consideration of dispersibility in binder resin, adhesion to binder resin, transmittance, coating workability, beauty of coating appearance, and the like, titanium dioxide, silica, and carbonic acid. Calcium, glass, barium sulfate, antimony trioxide, alumina and the like can be used.

본 발명에 따른 광확산필름에 있어서 상기 광확산제인 무기입자의 입경은 1 ~ 30㎛인 것이 바람직하며, 2 ~ 4㎛인 것이 더욱 바람직하다. 입경이 1㎛ 미만인 경우에는 무기입자가 바인더에서 분산되기 어렵고, 재응집에 의하여 광확산성 및 코팅성이 불량해지는 문제점이 있으며, 입경이 30㎛를 초과하는 경우에는 광확산층의 표면이 거칠어져서 광확산도가 감소하는 문제점이 있다.In the light diffusing film according to the present invention, the particle diameter of the inorganic particles as the light diffusing agent is preferably 1 to 30 μm, more preferably 2 to 4 μm. If the particle size is less than 1 μm, inorganic particles are difficult to disperse in the binder, and there is a problem in that light diffusibility and coating property are poor due to reagglomeration. If the particle size exceeds 30 μm, the surface of the light diffusion layer becomes rough and light There is a problem that the degree of diffusion decreases.

본 발명에 따른 광확산필름의 광확산층에 있어서, 무기입자의 양은 바인더 수지 100중량부를 기준으로 20 ~ 50중량부인 것이 바람직하다. 무기입자의 함량이 바인더 수지 100중량부를 기준으로 20중량부 미만이면 광확산성이 불량하고, 광투과율을 20 ~ 80%의 바람직한 광투과율로 조절하기 어렵고, 50중량부를 초과하면 필름의 광투과율이 20% 미만으로 되며 기재필름층과 광확산층과의 밀착력이 불량하게 되어 장시간 사용시 광확산필름의 각층이 분리될 수 있는 문제점이 있다.In the light diffusing layer of the light diffusing film according to the present invention, the amount of the inorganic particles is preferably 20 to 50 parts by weight based on 100 parts by weight of the binder resin. If the content of the inorganic particles is less than 20 parts by weight based on 100 parts by weight of the binder resin, the light diffusivity is poor, it is difficult to control the light transmittance to the desired light transmittance of 20 to 80%, and if it exceeds 50 parts by weight, the light transmittance of the film It becomes less than 20% and the adhesion between the base film layer and the light diffusion layer is poor, there is a problem that each layer of the light diffusion film can be separated when used for a long time.

본 발명에 따른 광확산필름의 광확산층은 폴리이소시아네이트 화합물, 킬레이트 화합물 등의 경화제를 상기 바인더수지 100 중량부를 기준으로 20 ~ 50중량부를 더 포함하는 것이 바람직한데, 상기 바인더 수지와 경화제의 총량을 기준으로 무기입자의 함량이 20 ~ 35 중량부로 조절하는 것이 더욱 바람직하다.The light diffusing layer of the light diffusing film according to the present invention preferably further comprises 20 to 50 parts by weight of a curing agent such as a polyisocyanate compound and a chelate compound based on 100 parts by weight of the binder resin, based on the total amount of the binder resin and the curing agent. As the content of the inorganic particles is more preferably adjusted to 20 to 35 parts by weight.

본 발명에 따른 광확산필름에 있어서 광확산층의 두께는 3 ~ 20g/m2으로 조절되는 것이 바람직하다. 광확산층의 두께가 3g/m2미만이면 광확산성이 불량하며, 20g/m2을 초과하면 광확산층의 표면이 너무 딱딱하게 되어 광확산층이 부러지는 문제점이 발생한다.In the light diffusion film according to the present invention, the thickness of the light diffusion layer is preferably adjusted to 3 to 20 g / m 2 . If the thickness of the light diffusion layer is less than 3g / m 2, the light diffusion property is poor, and if the thickness of the light diffusion layer is more than 20g / m 2 , the surface of the light diffusion layer becomes too hard, causing the light diffusion layer to be broken.

도 2는 기재필름의 양면에 광확산층이 적층된 본 발명의 제2 태양에 따른 광확산필름의 단면도이다.2 is a cross-sectional view of a light diffusing film according to a second aspect of the present invention in which a light diffusing layer is laminated on both surfaces of a base film.

도 2를 참조하면, 도 1과 비교할 때 고분자 기재필름(1)의 상부면의 광확산층(3) 뿐만 아니라 하부면에도 광확산층(3')이 더 적층되어 있는 점에서 도 1에 도시된 제1 태양에 따른 광확산필름과 다르다.Referring to FIG. 2, the light diffusing layer 3 ′ is further laminated on the lower surface as well as the light diffusing layer 3 of the upper surface of the polymer base film 1. 1 It is different from the light diffusion film according to the sun.

이하, 실시예 및 비교예를 참조하여 본 발명을 더욱 상세하게 설명하는데, 이는 본 발명의 구현예를 예시하기 위한 목적이며, 이에 의하여 본 발명의 범위가 이에 한정되지 않는 것은 물론이다.Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, which are for the purpose of illustrating embodiments of the present invention, whereby the scope of the present invention is not limited thereto.

한편 아래의 실시예 및 비교예에서 제조한 광확산 필름에 대하여 다음과 같은 방법으로 광투과율과 기재필름과의 밀착성을 평가하였다.On the other hand, for the light diffusing film prepared in the following Examples and Comparative Examples was evaluated the light transmittance and the adhesion between the base film.

광투과율Light transmittance

ASTM-D1003에 기재된 방법에 따라 아래의 실시예 및 비교예에서 얻은 광확산필름에 대하여 광투과율을 측정하였다.According to the method described in ASTM-D1003, light transmittance was measured for the light diffusing films obtained in the following Examples and Comparative Examples.

기재필름과의 밀착성Adhesion with Base Film

면도날을 이용하여 아래의 실시예 및 비교예에서 얻은 광확산필름의 광확산층만이 절단되도록 2mm 간격으로 가로방향으로 10개의 라인을 긋고, 또한 세로방향으로도 2mm 간격으로 10개의 라인을 그었다. 이렇게 하여 형성된 정사각형 모양으로 절단된 총 100개의 광확산층 절단편상에 OPP 테이프를 붙였다가 떼어낸 후 상기 기재필름으로부터 떨어져 나간 정사각형 절단편의 개수를 측정하여 아래와 같이 광확산층의 기재필름층과의 밀착성을 평가하였다.Using the razor blade, 10 lines were drawn in the horizontal direction at 2 mm intervals and 10 lines were also spaced at the 2 mm interval so that only the light diffusing layer of the light diffusing film obtained in the following Examples and Comparative Examples was cut. The number of square cut pieces separated from the base film after sticking and detaching OPP tape on a total of 100 light diffusing layer cut pieces cut in a square shape thus formed was evaluated to evaluate the adhesion between the light diffusing layer and the base film layer as follows. It was.

떨어져 나간 정사각형 절단편의 개수가 0개인 경우 : 양호If the number of square cutouts dropped is 0: Good

떨어져 나간 정사각형 절단편의 개수가 1개 이상인 경우 : 불량If there are more than one square cut-out pieces: bad

실시예 1Example 1

먼저 메틸 에틸 케톤(MEK)과 톨루엔(TOL)이 1:1의 중량비로 혼합된 혼합용매 45.0 중량부에 아크릴 공중합체 바인더 수지(대일본잉크화학공업사제, 아크릴텍 A-807) 30.0중량부, 평균입경 1.5㎛의 탄산칼슘 입자(동호칼슘사, TL-1000) 8.0 중량부, 평균입경 3.0㎛의 실리카 무기입자(동양화학공업주식회사, ML-836) 2.0 중량부, 평균입경 3.0㎛의 이산화티타늄 입자(석원산업, R-820) 0.5 중량부, 및 폴리이소시아네이트 프리폴리머 경화제(다케다 약품주식회사, D-110N) 15.0중량부를 균일하게 분산시켜 광확산층 형성용 조성물을 조제하였다.First, 30.0 parts by weight of an acrylic copolymer binder resin (acrytec A-807, manufactured by Nippon Ink Chemical Co., Ltd.) in 45.0 parts by weight of a mixed solvent in which methyl ethyl ketone (MEK) and toluene (TOL) were mixed at a weight ratio of 1: 1, 8.0 parts by weight of calcium carbonate particles (Dongho Calcium Co., Ltd., TL-1000) having an average particle diameter of 1.5 μm, 2.0 parts by weight of silica inorganic particles (ML-836) having an average particle diameter of 3.0 μm, titanium dioxide having an average particle diameter of 3.0 μm 0.5 parts by weight of particles (Sukwon Industry, R-820) and 15.0 parts by weight of a polyisocyanate prepolymer curing agent (Takeda Pharmaceutical Co., Ltd., D-110N) were uniformly dispersed to prepare a composition for forming a light diffusion layer.

이어서 상기 조성물을 두께 100㎛의 투명한 폴리에스테르 기재필름상에 1.9mm 메이어바를 사용하여 7g/m2의 두께로 도포한 후, 100℃에서 5분간 건조함으로써 광확산필름을 제조하였다.Subsequently, the composition was applied to a thickness of 7 g / m 2 using a 1.9 mm Mayer bar on a transparent polyester substrate film having a thickness of 100 μm, and then dried at 100 ° C. for 5 minutes to prepare a light diffusion film.

이와 같이 하여 제조된 상기 광확산필름은 기재필름과 광확산층과의 밀착성이 양호하였으며 광투과율이 80%이었다. 이 결과를 다른 실시예 및 비교예의 결과와 함께 표 1에 종합하였다.The light diffusing film thus produced had good adhesion between the base film and the light diffusing layer and had a light transmittance of 80%. This result was summarized in Table 1 with the result of another Example and a comparative example.

실시예 2Example 2

메틸 에틸 케톤(MEK)과 톨루엔(TOL)이 1:1의 중량비로 혼합된 혼합용매 45.0 중량부에 아크릴 공중합체 바인더 수지(대일본잉크화학공업사제, 아크릴텍 A-807) 30.0중량부, 평균입경 1.5㎛의 탄산칼슘 입자(동호칼슘사, TL-1000) 3.0 중량부, 평균입경 3.0㎛의 실리카 입자(동양화학공업주식회사, ML-836) 2.0 중량부, 평균입경 3.0㎛의 이산화티타늄 입자(석원산업, R-820) 7.5 중량부, 및 폴리이소시아네이트 프리폴리머 경화제(다케다 약품주식회사, D-110N) 15.0중량부를 균일하게 분산시켜 광확산층 형성용 조성물을 조제한 것을 제외하고는 실시예 1과 동일한 방법으로 광확산필름을 제조하였다.30.0 parts by weight of an acrylic copolymer binder resin (Acrylic Tech A-807, manufactured by Nippon Ink Chemical Co., Ltd.) in 45.0 parts by weight of a mixed solvent in which methyl ethyl ketone (MEK) and toluene (TOL) were mixed at a weight ratio of 1: 1. 3.0 parts by weight of calcium carbonate particles (Dongho Calcium Co., TL-1000) having a particle size of 1.5 μm, 2.0 parts by weight of silica particles (ML-836) having an average particle diameter of 3.0 μm, and titanium dioxide particles having an average particle size of 3.0 μm ( Seokwon Industrial Co., Ltd., R-820) 7.5 parts by weight, and 15.0 parts by weight of a polyisocyanate prepolymer curing agent (Takeda Pharmaceutical Co., Ltd., D-110N) were uniformly dispersed in the same manner as in Example 1 except that the composition for forming a light diffusion layer was prepared. A light diffusion film was prepared.

이와 같이 하여 제조된 상기 광확산필름은 기재필름과 광확산층과의 밀착성이 양호하였으며 광투과율이 25%이었다. 이 결과를 다른 실시예 및 비교예의 결과와 함께 표 1에 종합하였다.The light diffusing film thus produced had good adhesion between the base film and the light diffusing layer and had a light transmittance of 25%. This result was summarized in Table 1 with the result of another Example and a comparative example.

비교예 1Comparative Example 1

메틸 에틸 케톤(MEK)과 톨루엔(TOL)이 1:1의 중량비로 혼합된 혼합용매 45.0 중량부에 아크릴 공중합체 바인더 수지(대일본잉크화학공업사제, 아크릴텍 A-807) 30.0중량부, 평균입경 1.5㎛의 탄산칼슘 입자(동호칼슘사, TL-1000) 8.0 중량부, 평균입경 10.0㎛의 실리카 입자(동양화학공업주식회사, ML-362) 2.0 중량부, 평균입경 3.0㎛의 이산화티타늄 입자(석원산업, R-820) 0.5 중량부, 및 폴리이소시아네이트 프리폴리머 경화제(다케다 약품주식회사, D-110N) 15.0중량부를 균일하게 분산시켜 광확산층 형성용 조성물을 조제한 것을 제외하고는 실시예 1과 동일한 방법으로 광확산필름을 제조하였다30.0 parts by weight of an acrylic copolymer binder resin (Acrylic Tech A-807, manufactured by Nippon Ink Chemical Co., Ltd.) in 45.0 parts by weight of a mixed solvent in which methyl ethyl ketone (MEK) and toluene (TOL) were mixed at a weight ratio of 1: 1. 8.0 parts by weight of calcium carbonate particles (Dongho Calcium Co., Ltd., TL-1000) having a particle diameter of 1.5 μm, 2.0 parts by weight of silica particles (ML-362) having an average particle diameter of 10.0 μm, and titanium dioxide particles having an average particle diameter of 3.0 μm ( Seokwon Industries, R-820) 0.5 parts by weight, and 15.0 parts by weight of a polyisocyanate prepolymer curing agent (Takeda Pharmaceutical Co., Ltd., D-110N) was uniformly dispersed in the same manner as in Example 1 except that a composition for forming a light diffusion layer was prepared. A light diffusion film was prepared

이와 같이 하여 제조된 상기 광확산필름은 광투과율이 75%로서 양호하였으나 기재필름과 광확산층과의 밀착성이 불량하였다. 이 결과를 다른 실시예 및 비교예의 결과와 함께 표 1에 종합하였다.The light diffusing film thus produced had a good light transmittance of 75% but poor adhesion between the base film and the light diffusing layer. This result was summarized in Table 1 with the result of another Example and a comparative example.

비교예 2Comparative Example 2

메틸 에틸 케톤(MEK)과 톨루엔(TOL)이 1:1의 중량비로 혼합된 혼합용매 45.0 중량부에 아크릴 공중합체 바인더 수지(대일본잉크화학공업사제, 아크릴텍 A-807) 30.0중량부, 평균입경 1.5㎛의 탄산칼슘 입자(동호칼슘사, TL-1000) 7.0 중량부, 평균입경 3.0㎛의 실리카 입자(동양화학공업주식회사, ML-836) 5.0 중량부, 평균입경 3.0㎛의 이산화티타늄 입자(석원산업, R-820) 7.0 중량부, 및 폴리이소시아네이트 프리폴리머 경화제(다케다 약품주식회사, D-110N) 15.0중량부를 균일하게 분산시켜 광확산층 형성용 조성물을 조제한 것을 제외하고는 실시예 1과 동일한 방법으로 광확산필름을 제조하였다.30.0 parts by weight of an acrylic copolymer binder resin (Acrylic Tech A-807, manufactured by Nippon Ink Chemical Co., Ltd.) in 45.0 parts by weight of a mixed solvent in which methyl ethyl ketone (MEK) and toluene (TOL) were mixed at a weight ratio of 1: 1. 7.0 parts by weight of calcium carbonate particles (Dongho Calcium Co., Ltd., TL-1000) having a particle diameter of 1.5 μm, 5.0 parts by weight of silica particles (ML-836) having an average particle diameter of 3.0 μm, and titanium dioxide particles having an average particle diameter of 3.0 μm ( Seokwon Industries, R-820) 7.0 parts by weight, and 15.0 parts by weight of a polyisocyanate prepolymer curing agent (Takeda Pharmaceutical Co., Ltd., D-110N) by uniformly dispersing to prepare a composition for forming a light diffusion layer in the same manner as in Example 1 A light diffusion film was prepared.

이와 같이 하여 제조된 상기 광확산필름은 기재필름과 광확산층과의 밀착성은 양호하였으나 광투과율이 15%로서 불량하였다. 이 결과를 다른 실시예 및 비교예의 결과와 함께 표 1에 종합하였다.The light diffusing film prepared as described above had good adhesion between the base film and the light diffusing layer, but had a poor light transmittance of 15%. This result was summarized in Table 1 with the result of another Example and a comparative example.

광투과율Light transmittance 기재필름과의 밀착성Adhesion with Base Film 실시예 1Example 1 80%80% 양호Good 실시예 2Example 2 25%25% 양호Good 비교예 1Comparative Example 1 75%75% 불량Bad 비교예 2Comparative Example 2 15%15% 양호Good

상기한 바와 같이, 본 발명에 따른 광확산필름은 본 발명에 따른 광확산필름은 기재 필름과의 밀착력이 우수하고 광투과율도 20 ~ 80%로 우수하여 디스플레이 패널과 LED 광원과의 사이가 가까워도 LED 광원에서 유래된 광원을 고르게 확산시킬 수 있는 장점이 있다.As described above, the light diffusing film according to the present invention has excellent adhesion with the base film and excellent light transmittance of 20 to 80%, even if the display panel is close to the LED light source. There is an advantage that can evenly spread the light source derived from the LED light source.

Claims (5)

투명한 고분자 기재필름; 및Transparent polymer base film; And 상기 고분자 기재 필름의 일면 또는 양면에 형성된 광확산층으로서, 아크릴계 수지, 우레탄계 수지, 폴리에스테르계 수지, 에폭시계 수지, 하나의 분자중에 2개 이상의 아크릴기를 포함하는 아크릴계 수지 또는 이들의 혼합물에서 선택된 하나 이상의 바인더 수지와 상기 바인더 수지 100 중량부를 기준으로 평균입경은 2 ~ 4㎛의 무기입자 20 ~ 50중량부를 함유하는 광확산층을 포함하는 것을 특징으로 광확산필름.Light diffusion layer formed on one side or both sides of the polymer substrate film, at least one selected from acrylic resin, urethane resin, polyester resin, epoxy resin, acrylic resin containing two or more acrylic groups in one molecule or mixtures thereof The light diffusing film, characterized in that it comprises a light diffusion layer containing 20 to 50 parts by weight of the inorganic particles of 2 to 4 ㎛ average particle diameter based on the binder resin and 100 parts by weight of the binder resin. 제1항에 있어서, 상기 광확산층의 두께는 3 ~ 20g/m2인 것을 특징으로 하는 광확산필름.The light diffusing film of claim 1, wherein the light diffusing layer has a thickness of 3 to 20 g / m 2 . 제1항에 있어서, 상기 광확산필름의 광투과율은 20 ~ 80%인 것을 특징으로 하는 광확산필름.The light diffusing film of claim 1, wherein the light transmittance of the light diffusing film is 20 to 80%. 제1항에 있어서, 상기 무기입자는 이산화티타늄, 실리카, 탄산칼슘, 유리, 황산바륨, 삼산화안티몬, 알루미나 또는 이들의 혼합물에서 선택된 하나 이상인 것을 특징으로 하는 광확산필름.The light diffusing film of claim 1, wherein the inorganic particles are at least one selected from titanium dioxide, silica, calcium carbonate, glass, barium sulfate, antimony trioxide, alumina, or a mixture thereof. 제1항에 있어서, 상기 광확산층은 열경화성 경화제를 상기 바인더수지 100 중량부를 기준으로 20 ~ 50중량부를 더 포함하는 것을 특징으로 하는 광확산필름.The light diffusing film of claim 1, wherein the light diffusing layer further comprises 20 to 50 parts by weight of a thermosetting curing agent based on 100 parts by weight of the binder resin.
KR1020010072260A 2001-11-20 2001-11-20 Light diffusion film KR20030041459A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0659108A (en) * 1991-07-25 1994-03-04 Tsujimoto Denki Seisakusho:Kk Highly light diffusive film
JPH06155674A (en) * 1992-11-20 1994-06-03 Mitsui Toatsu Chem Inc Light diffusion film
KR970010102A (en) * 1995-08-31 1997-03-27 박홍기 Light diffusion film
KR19980016613A (en) * 1996-08-29 1998-06-05 한형수 Manufacturing method of light diffusion film for LED
KR20000027861A (en) * 1998-10-29 2000-05-15 한형수 Light-diffusion type semipermeable film

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0659108A (en) * 1991-07-25 1994-03-04 Tsujimoto Denki Seisakusho:Kk Highly light diffusive film
JPH06155674A (en) * 1992-11-20 1994-06-03 Mitsui Toatsu Chem Inc Light diffusion film
KR970010102A (en) * 1995-08-31 1997-03-27 박홍기 Light diffusion film
KR19980016613A (en) * 1996-08-29 1998-06-05 한형수 Manufacturing method of light diffusion film for LED
KR20000027861A (en) * 1998-10-29 2000-05-15 한형수 Light-diffusion type semipermeable film

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