KR100691039B1 - A polarizer, manufacturing method thereof and a liquid crystal display having the same - Google Patents
A polarizer, manufacturing method thereof and a liquid crystal display having the same Download PDFInfo
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- KR100691039B1 KR100691039B1 KR1020050102835A KR20050102835A KR100691039B1 KR 100691039 B1 KR100691039 B1 KR 100691039B1 KR 1020050102835 A KR1020050102835 A KR 1020050102835A KR 20050102835 A KR20050102835 A KR 20050102835A KR 100691039 B1 KR100691039 B1 KR 100691039B1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
- B05D3/065—After-treatment
- B05D3/067—Curing or cross-linking the coating
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
Abstract
Description
본 발명은 보호막을 구비한 편광판, 그 제조방법 및 이를 구비한 액정표시장치에 관한 것이다. The present invention relates to a polarizing plate having a protective film, a method of manufacturing the same, and a liquid crystal display device having the same.
액정표시장치에 대한 편광 공급 소자 및 검출 소자로서 편광판이 널리 사용되고 있다. 편광판으로는 폴리비닐알코올 필름에 요오드나 이색성 염료를 흡착시키고 이를 일정방향으로 연신하여 제조한 편광 필름을 사용하는 것이 통상적인데, 이렇게 제조한 편광 필름은 투과축의 방향에 대한 기계적 강도가 약하고 열이나 수분에 의해 수축하여 편광기능이 현저히 저하되는 단점이 있다. 따라서, 초산 셀룰로오스 필름 등을 접착제로 합착시켜 이러한 단점을 보완하고 있다. BACKGROUND OF THE INVENTION Polarizing plates are widely used as polarization supply elements and detection elements for liquid crystal displays. As a polarizing plate, a polarizing film prepared by adsorbing iodine or dichroic dye on a polyvinyl alcohol film and stretching it in a predetermined direction is commonly used. The polarizing film thus prepared has a weak mechanical strength in the direction of the transmission axis, Shrink by moisture, there is a disadvantage that the polarization function is significantly reduced. Thus, by bonding the cellulose acetate film or the like with an adhesive to compensate for this disadvantage.
그러나, 액정표시장치가 노트북 컴퓨터, 휴대전화, 디지털 카메라 등 모바일 용도로 사용이 확대됨에 따라, 그 내구성과 경박단소의 필요성이 대두되었다. 전술한 종래의 편광판, 즉 편광 필름의 보호용으로서 초산 셀룰로오스 필름을 접착제로 합착시키는 방법으로 제조한 편광판은 시간에 따른 온습 내구성이 떨어지고, 그 보호막의 두께도 20㎛ 이하로 형성하기 곤란하여 경박단소의 목적을 달성하기 어렵 다. 또한 초산 셀룰로오스 필름으로 이루어진 보호막은 표면 경도가 약해서 취급상 주의를 요한다. However, as the use of liquid crystal display devices has been expanded to mobile applications such as notebook computers, cellular phones, and digital cameras, the durability and light and small size of the device have emerged. The above-mentioned conventional polarizing plate, that is, a polarizing plate manufactured by the method of bonding the cellulose acetate film as an adhesive for the protection of the polarizing film, has poor temperature and humidity durability over time, and the thickness of the protective film is also difficult to be formed at 20 μm or less. Difficult to achieve the purpose In addition, a protective film made of a cellulose acetate film has a weak surface hardness and requires attention in handling.
전술한 초산 셀룰로오스 필름 보호막의 결점을 보완하기 위하여, 예컨대 JP2000-199819A에는 친수성 중합체로 이루어진 편광필름의 적어도 한면에 환상 폴리올레핀 용액을 도포 및 건조함으로써, 얇고 양호한 내구성을 가진 보호막을 형성하는 방법이 기술되어 있다. 그러나, 환상 폴리올레핀으로 된 보호막은 폴리비닐알코올 편광 필름과의 접착성이 불량하고 내수성이 약하여 고온 고습 내구성이 저하되는 단점이 있다. In order to compensate for the above-mentioned shortcomings of the cellulose acetate film protective film, for example, JP2000-199819A describes a method of forming a thin and good durability protective film by applying and drying a cyclic polyolefin solution on at least one side of a polarizing film made of a hydrophilic polymer. have. However, a protective film made of a cyclic polyolefin has a disadvantage in that adhesiveness with a polyvinyl alcohol polarizing film is poor and water resistance is weak so that high temperature, high humidity durability is lowered.
한편, JP-P-2003-00033320에도 에폭시 수지를 주성분으로서 형성한 보호막을 갖는 편광판에 관하여 기술하고 있다. 그러나, 에폭시 수지로 된 보호막은 절단 가공시 절단면에 균열이 발생하여 광학 결함을 발생시키기 쉽다는 문제점과 대부분 환상고리에 의한 황변이 발생하기 쉽다는 단점이 있다. On the other hand, JP-P-2003-00033320 also describes a polarizing plate having a protective film formed of an epoxy resin as a main component. However, the protective film made of epoxy resin has the disadvantages that cracks are generated in the cut surface during the cutting process, so that optical defects are easily generated, and yellowing due to an annular ring is most likely to occur.
본 발명이 이루고자 하는 기술적 과제는 상기 문제점을 해결하여, 간단하고 경제적인 공정으로 경량의 박형 편광판 제조가 가능할 뿐만 아니라, 제조된 편광판은 편광 필름과 그 표면에 형성된 보호막과의 접착력이 양호하고 광 투과율과 편광도, 경도 등의 물성도 우수한 보호막 구비 편광판, 그 제조방법 및 이를 구비한 액정표시장치를 제공하는데 있다. The technical problem to be solved by the present invention is to solve the above problems, it is possible to manufacture a lightweight thin polarizing plate in a simple and economical process, the prepared polarizing plate has a good adhesion between the polarizing film and the protective film formed on the surface and the light transmittance The present invention also provides a polarizing plate with a protective film having excellent physical properties such as polarization degree and hardness, a manufacturing method thereof, and a liquid crystal display device having the same.
상기 기술적 과제를 달성하기 위하여 본 발명의 편광판 제조방법은 (S1) 저 분자량의 광경화형 아크릴레이트 수지 및 광개시제를 함유하는 코팅액을 준비하는 단계; (S2) 상기 코팅액을 폴리비닐알코올 편광 필름의 일면 또는 양면에 도포하고 도막을 형성하는 단계; 및 (S3) 상기 형성된 도막에 자외선을 조사하는 단계를 포함한다. In order to achieve the above technical problem, the method of manufacturing a polarizing plate of the present invention includes preparing a coating solution containing (S1) a low molecular weight photocurable acrylate resin and a photoinitiator; (S2) applying the coating solution to one or both sides of the polyvinyl alcohol polarizing film and forming a coating film; And (S3) irradiating ultraviolet rays to the formed coating film.
본 발명의 편광판 제조방법에 있어서, 상기 저분자량의 광경화형 아크릴레이트 수지는 광경화형 아크릴레이트 모노머 및 광경화형 아크릴레이트 올리고머의 혼합물을 사용하는 것이 바람직하고, 이 때 광경화형 아크릴레이트 모노머와 광경화형 아크릴레이트 올리고머의 혼합 중량비는 50:50 ~ 10:90인 것이 더욱 바람직하다. In the method of manufacturing a polarizing plate of the present invention, the low molecular weight photocurable acrylate resin is preferably a mixture of a photocurable acrylate monomer and a photocurable acrylate oligomer, wherein the photocurable acrylate monomer and the photocurable acrylic The mixing weight ratio of the late oligomer is more preferably 50:50 to 10:90.
또한, 본 발명은 (a) 폴리비닐알코올 편광 필름; 및 (b) 상기 편광 필름의 적어도 일면에 형성되며, 광경화된 아크릴레이트 수지로 이루어진 보호막을 구비한 편광판을 제공한다. In addition, the present invention (a) polyvinyl alcohol polarizing film; And (b) a polarizing plate formed on at least one surface of the polarizing film and having a protective film made of a photocured acrylate resin.
이하, 본 발명에 대하여 상세히 설명한다. 이에 앞서, 본 명세서 및 청구범위에 사용된 용어나 단어는 통상적이거나 사전적인 의미로 한정해서 해석되어서는 아니되며, 발명자는 그 자신의 발명을 가장 최선의 방법으로 설명하기 위해 용어의 개념을 적절하게 정의할 수 있다는 원칙에 입각하여 본 발명의 기술적 사상에 부합하는 의미와 개념으로 해석되어야만 한다. EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.
본 발명의 편광판 제조방법은 먼저, 저분자량의 광경화형 아크릴레이트 수지 및 광개시제를 함유하는 코팅액을 준비한다(S1 단계). In the polarizing plate manufacturing method of the present invention, first, a coating liquid containing a low molecular weight photocurable acrylate resin and a photoinitiator is prepared (step S1).
본 발명에 있어서 저분자량의 광경화형 아크릴레이트 수지란 UV 등 광 조사 에 의해 경화반응을 일으키는 광경화형 아크릴레이트 모노머 또는 광경화형 아크릴레이트 올리고머를 의미한다. 이러한 저분자량의 광경화형 아크릴레이트 수지로는 우레탄 아크릴레이트, 폴리에스테르 아크릴레이트, 에폭시 아크릴레이트 등이 잘 알려져 있다. 코팅액에 사용되는 저분자량의 광경화형 아크릴레이트 수지로는 광경화형 아크릴레이트 모노머와 광경화형 아크릴레이트 올리고머를 각각 단독으로 또는 이들을 1종 이상 혼합하여 사용할 수 있다. In the present invention, the low molecular weight photocurable acrylate resin means a photocurable acrylate monomer or a photocurable acrylate oligomer which causes a curing reaction by light irradiation such as UV. As such a low molecular weight photocurable acrylate resin, urethane acrylate, polyester acrylate, epoxy acrylate and the like are well known. As the low molecular weight photocurable acrylate resin used in the coating solution, a photocurable acrylate monomer and a photocurable acrylate oligomer may be used alone or in combination of one or more thereof.
형성되는 보호막의 표면경도를 높이기 위해서는 저분자량의 광경화형 아크릴레이트 수지로서, 다가의 관능기를 갖는 아크릴레이트 올리고머, 예를 들어 중량평균 분자량이 1000 내지 4000 정도이며, 2 내지 15개(더욱 바람직하게는 6개 이상)의 아크릴기를 말단기로 갖는 올리고머를 사용하는 것이 바람직하다. 다만. 광경화형 아크릴레이트 올리고머를 단독으로 사용하는 경우 점도가 높고 코팅성이 좋지 않으므로, 광경화형 아크릴레이트 모노머로 희석하여 사용하는 것이 더욱 바람직하다. 이 때, 광경화형 아크릴레이트 모노머와 광경화형 아크릴레이트 올리고머의 혼합비는 중량비로 50:50 ~ 10:90 정도가 바람직하다. In order to increase the surface hardness of the protective film to be formed, it is a low molecular weight photocurable acrylate resin, and an acrylate oligomer having a polyvalent functional group, for example, has a weight average molecular weight of about 1000 to 4000, more preferably 2 to 15 (more preferably It is preferable to use an oligomer having 6 or more) acrylic groups as end groups. but. When the photocurable acrylate oligomer is used alone, since the viscosity is high and the coating property is not good, it is more preferable to dilute with the photocurable acrylate monomer. At this time, the mixing ratio of the photocurable acrylate monomer and the photocurable acrylate oligomer is preferably about 50:50 to 10:90 by weight.
코팅액에 함유되는 광개시제로는 예를 들어 200 ~400nm의 자외선 파장영역을 흡수하는 공지의 광개시제들을 사용할 수 있다. 바람직하게는 단파장 영역(250nm 부근)에서 주 피크를 갖는 광개시제를 사용한다. As the photoinitiator contained in the coating liquid, for example, known photoinitiators that absorb an ultraviolet wavelength range of 200 to 400 nm may be used. Preferably, a photoinitiator having a main peak in the short wavelength region (near 250 nm) is used.
코팅액에 용매는 첨가하지 않는 것이 바람직하나, 도막의 두께 및 수축율 조절을 위해 첨가할 수 있는데, 예를 들어 저분자량의 광경화형 아크릴레이트 수지 총 중량 대비 20 내지 100중량%를 첨가할 수 있다. 이 외에, 코팅액에는 본 발명의 목적을 저해하지 않는 한도 내에서 레벨링제, 접착 증진제, 계면활성제, 산화방지제, UV 흡수제 등을 더 첨가할 수 있음은 물론이다. The solvent is not preferably added to the coating solution, but may be added to control the thickness and shrinkage of the coating film. For example, 20 to 100% by weight of the total molecular weight of the low molecular weight photocurable acrylate resin may be added. In addition, the leveling agent, adhesion promoter, surfactant, antioxidant, UV absorber and the like can be further added to the coating liquid without departing from the object of the present invention.
이어서, 상기 준비한 코팅액을 폴리비닐알코올 편광 필름의 일면 또는 양면에 도포하고 도막을 형성한다(S2 단계). Subsequently, the prepared coating solution is applied to one or both surfaces of the polyvinyl alcohol polarizing film to form a coating film (step S2).
폴리비닐알코올 편광 필름으로는 공지의 방법에 따라 요오드 또는 이색성 염료를 흡착시킨 것을 사용할 수 있다. 코팅액을 도포하는 방식으로는 그라비아 방식, 메이어바 방식 등과 같은 롤 코팅방식을 사용하는 것이 바람직하며, 그 외 콤마 방식, 슬롯 다이방식과 같은 타입의 코팅방식도 사용할 수 있다. 코팅액에 용매를 첨가한 경우에는 도포 후 열풍 등을 가하여 용매를 증발시켜 도막을 형성한다.형성된 도막의 두께는 2 내지 20㎛ 정도가 바람직하다. As a polyvinyl alcohol polarizing film, what adsorbed iodine or a dichroic dye can be used according to a well-known method. As a method of applying the coating solution, it is preferable to use a roll coating method such as a gravure method, a Meyer bar method, and other types of coating methods such as a comma method and a slot die method. When a solvent is added to the coating solution, hot air or the like is applied to the coating solution to evaporate the solvent to form a coating film. The thickness of the formed coating film is preferably about 2 to 20 µm.
그런 다음, 상기 형성된 도막에 자외선을 조사한다(S3 단계). Then, the formed coating film is irradiated with ultraviolet rays (S3 step).
자외선 조사장치로는 고압 수은등, 또는 메탈 할라이드 등을 사용하는 것이 경제적이다. 자외선 조사에 따라, 코팅액의 저분자량 광경화형 아크릴레이트 수지의 경화반응이 진행된다. 이렇게 얻어진 편광판은 폴리비닐알코올 편광 필름(a)의 적어도 일면에, 광경화된 아크릴레이트 수지로 이루어진 보호막(b)이 형성된다. It is economical to use a high pressure mercury lamp or a metal halide as an ultraviolet irradiation device. In accordance with ultraviolet irradiation, the curing reaction of the low molecular weight photocurable acrylate resin of the coating liquid proceeds. In the polarizing plate thus obtained, a protective film (b) made of a photocured acrylate resin is formed on at least one surface of the polyvinyl alcohol polarizing film (a).
전술한 본 발명의 제조방법은 간단하고 경제적인 공정으로서, 경량의 박형 편광판 제조가 가능하다. 또한, 제조된 편광판은 폴리비닐알코올 편광 필름과 그 표면에 형성된 보호막 사이의 접착력이 양호하고 보호막의 표면경도 또한 우수하다. 더불어, 제조된 편광판의 광 투과율과 편광도도 우수하여 액정표시장치의 편광판으로서 충분한 기능을 발휘하게 된다. The manufacturing method of the present invention described above is a simple and economical process, it is possible to manufacture a lightweight thin polarizing plate. In addition, the produced polarizing plate has good adhesion between the polyvinyl alcohol polarizing film and the protective film formed on the surface thereof, and the surface hardness of the protective film is also excellent. In addition, the light transmittance and polarization degree of the manufactured polarizing plate are also excellent, thereby exhibiting sufficient functions as a polarizing plate of the liquid crystal display device.
본 발명의 편광판 및 그 제조방법에 있어서, 필요에 따라 편광 필름 또는 보호막 표면에 반사 방지층, 눈부심 방지층(Anti-glare),지문 방지층 등 공지의 다양한 기능을 부여하기 위한 코팅층 또는 필름을 더 형성할 수 있음은 물론이다. In the polarizing plate of the present invention and a method for manufacturing the same, a coating layer or film for imparting various known functions such as an anti-reflection layer, an anti-glare layer, an anti-fingerprint layer, and the like may be further formed on the surface of the polarizing film or the protective film as necessary. Of course.
이하, 본 발명의 이해를 돕기 위하여 실시예를 들어 상세하게 설명하기로 한다. 그러나, 본 발명에 따른 실시예들은 여러 가지 다른 형태로 변형될 수 있으며, 본 발명의 범위가 하기 실시예에 한정되는 것으로 해석되어져서는 안 된다. 본 발명의 실시예들은 당업계에서 평균적인 지식을 가진 자에게 본 발명을 보다 완전하게 설명하기 위해 제공되어 지는 것이다. Hereinafter, examples will be described in detail to help understand the present invention. However, embodiments according to the present invention can be modified in many different forms, the scope of the invention should not be construed as limited to the following examples. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art.
실시예 1Example 1
먼저, 광경화형 코팅액을 준비하였다. 광경화형 우레탄 아크릴레이트 올리고머(ucb社) EB1290 30wt%와 트리메틸올프로판 트리아크릴레이트 모노머 10wt%(ucb社)와, 5wt%의 광개시제(IG184,Ciba-Geigy), 0.2wt%의 leveling 첨가제(BYK361,BYK사)를 이소프로필알코올(IPA) 55%에 희석하여 45wt%의 농도를 갖도록 코팅용액을 제조하였다. First, a photocurable coating liquid was prepared. Photocurable urethane acrylate oligomer (ucb) EB1290 30wt%, trimethylolpropane triacrylate monomer 10wt% (ucb), 5wt% photoinitiator (IG184, Ciba-Geigy), 0.2wt% leveling additive (BYK361, BYK) was diluted with 55% isopropyl alcohol (IPA) to prepare a coating solution to have a concentration of 45wt%.
상기 코팅액을 폴리비닐알콜(PVA) 편광 필름 위에 롤코팅(roll coating)방법을 이용하여 도포하였다. 도포 후 80℃의 건조기에서 용제를 건조시켰고, 건조도막의 두께는 10㎛였다. The coating solution was applied on a polyvinyl alcohol (PVA) polarizing film using a roll coating method. After coating, the solvent was dried in a dryer at 80 ° C., and the thickness of the dried coating film was 10 μm.
이어서, 도막에 UV를 조사하여 도막을 경화시켜 편광판을 완성하였다. UV 조사는 300W(중심파장 254nm)램프를 사용하였고, 조사 광량은 1J/m2을 적용하였다. Subsequently, the coating film was irradiated with UV to cure the coating film to complete the polarizing plate. UV irradiation was performed using a 300W (center wavelength 254nm) lamp, the irradiation light amount was applied to 1J / m 2 .
<편광판의 물성 평가> <Evaluation of Physical Properties of Polarizing Plate>
필름과 보호막의 접착력은 JIS K 5400의 방식으로 그리드법을 사용하여 측정하였다. 형성된 그리드 개수에 대한 비박리 그리드 개수는 100/100이었고, 이는 필름과 보호막 사이의 접착성이 매우 양호함을 증명한다. The adhesion between the film and the protective film was measured using the grid method in the manner of JIS K 5400. The number of non-peeled grids with respect to the number of grids formed was 100/100, which proves that the adhesion between the film and the protective film is very good.
또한, 표면 경도는 ASTM D 3363 방식에 의한 연필경도로 측정하였으며, H에서 2H의 양호한 수준을 얻었다. In addition, the surface hardness was measured by the pencil hardness according to the ASTM D 3363 method, obtaining a good level of 2H in H.
편광성능은 분광광도계(상품명"UV2200" 시미쥬사 제품)를 사용하여 평가하였고, 단순 투과율은 42%, 편광도는 99.98%로서, 경화반응 후에도 우수한 편광성능을 유지하였다. The polarization performance was evaluated using a spectrophotometer (trade name "UV2200" manufactured by Shimiju Co., Ltd.). The simple transmittance was 42% and the polarization degree was 99.98%, maintaining excellent polarization performance even after the curing reaction.
실시예 2Example 2
광경화형 에폭시 아크릴레이트 올리고머(ucb社) EB600 30wt%와 펜타에리스리톨 트리아크릴레이트 모노머 10wt%(ucb社)와, 5wt%의 광개시제(IG184,Ciba-Geigy), 0.2wt%의 leveling 첨가제(BYK361,BYK사)를 이소프로필알코올(IPA) 55%에 희석하여 45wt%의 농도를 갖도록 코팅액을 제조하였다. Photocurable epoxy acrylate oligomer (ucb) EB600 30wt%, pentaerythritol triacrylate monomer 10wt% (ucb), 5wt% photoinitiator (IG184, Ciba-Geigy), 0.2wt% leveling additive (BYK361, BYK G) was diluted in 55% of isopropyl alcohol (IPA) to prepare a coating solution to have a concentration of 45wt%.
상기 코팅액을 폴리비닐알콜(PVA) 편광 필름 위에 롤코팅(roll coating)방법을 이용하여 도포하였다. 도포 후 80℃의 건조기에서 용제를 건조시켰고, 건조도막의 두께는 15㎛였다. The coating solution was applied on a polyvinyl alcohol (PVA) polarizing film using a roll coating method. After coating, the solvent was dried in a dryer at 80 ° C., and the thickness of the dried coating film was 15 μm.
이어서, 도막에 UV를 조사하여 도막을 경화시켜 편광판을 완성하였다. UV 조사는 300W(중심파장 254nm)램프를 사용하였고, 조사 광량은 1J/m2을 적용하였다. Subsequently, the coating film was irradiated with UV to cure the coating film to complete the polarizing plate. UV irradiation was performed using a 300W (center wavelength 254nm) lamp, the irradiation light amount was applied to 1J / m 2 .
<편광판의 물성 평가> <Evaluation of Physical Properties of Polarizing Plate>
전술한 방법과 동일한 방법으로 편광판의 물성을 평가하였다. The physical properties of the polarizing plate were evaluated in the same manner as described above.
성된 그리드 개수에 대한 비박리 그리드 개수는 100/100이었고, 이는 필름과 보호막 사이의 접착성이 매우 양호함을 증명한다. The number of non-peeled grids to the number of grids formed was 100/100, which proves that the adhesion between the film and the protective film is very good.
또한, 표면 경도는 H에서 2H의 양호한 수준을 얻었다. In addition, the surface hardness obtained a good level of 2H in H.
단순 투과율은 40%로서 보호필름으로서 초산 셀룰로오스 필름을 접착제로 접착한 편광판보다 약 8% 정도 투과율이 향상되었다. 편광도는 99.98%로서, 경화반응 후에도 우수한 편광성능을 유지하였다. The simple transmittance was 40%, and the transmittance was improved by about 8% compared to the polarizing plate to which the cellulose acetate film was bonded with an adhesive as a protective film. The degree of polarization was 99.98% and maintained excellent polarization performance even after the curing reaction.
비교예 1Comparative Example 1
환상 폴리올레핀수지인 상품명 "Atton"(JSA사 제품)의 40중량% 톨루엔 용액을 제조하였다. 이 용액을 100m의 공극을 갖는 바코터를 사용하여 폴리비닐알콜-요오드계 편광필름의 표면에 도포하였다. A 40 wt% toluene solution of the trade name “Atton” (manufactured by JSA), which is a cyclic polyolefin resin, was prepared. This solution was applied to the surface of the polyvinyl alcohol-iodine polarizing film using a bar coater having a pore of 100 m.
도포 후 이 편광판을 100℃에서 가열된 열풍오븐속에서 10분 동안 건조하였다. After coating, the polarizing plate was dried in a hot air oven heated at 100 ° C. for 10 minutes.
제조된 편광판의 편광필름과 보호막 사이의 접착력을 JIS K 5400에 기재된 그리드법에 의해 평가하였다. 형성된 그리드 수에 대한 비박리 그리드의 수가 0/100이었고, 이는 편광필름과의 접착성이 없음을 증명한다. The adhesive force between the polarizing film and the protective film of the produced polarizing plate was evaluated by the grid method described in JISK5400. The number of non-peeled grids with respect to the number of grids formed was 0/100, which proves lack of adhesion with the polarizing film.
이상에서 살펴 본 바와 같이, 본 발명의 제조방법은 코팅방법을 이용한 간단하고 경제적인 공정으로서, 경량의 박형 편광판 제조가 가능하다. As described above, the manufacturing method of the present invention is a simple and economic process using a coating method, it is possible to manufacture a lightweight thin polarizing plate.
또한, 제조된 편광판은 폴리비닐알코올 편광 필름과 그 표면에 형성된 보호막 사이의 접착력이 양호하고 보호막의 표면경도 또한 우수하다. 더불어, 제조된 편광판의 광 투과율과 편광도도 우수하여 액정표시장치의 편광판으로서 개선된 기능을 발휘하게 된다. In addition, the produced polarizing plate has good adhesion between the polyvinyl alcohol polarizing film and the protective film formed on the surface thereof, and the surface hardness of the protective film is also excellent. In addition, the light transmittance and polarization degree of the manufactured polarizing plate are also excellent, thereby exhibiting an improved function as a polarizing plate of a liquid crystal display device.
Claims (11)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
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| KR1020050102835A KR100691039B1 (en) | 2005-10-31 | 2005-10-31 | A polarizer, manufacturing method thereof and a liquid crystal display having the same |
| CNA200680040487XA CN101317124A (en) | 2005-10-31 | 2006-10-24 | Polarization plate, method of manufacturing the same, and liquid crystal display including the same |
| PCT/KR2006/004349 WO2007052912A1 (en) | 2005-10-31 | 2006-10-24 | Polarization plate, method of manufacturing the same, and liquid crystal display including the same |
| JP2008537590A JP2009514009A (en) | 2005-10-31 | 2006-10-24 | Polarizing plate, manufacturing method thereof, and liquid crystal display device including the same |
| TW095139966A TWI315415B (en) | 2005-10-31 | 2006-10-30 | Polarization plate, method of manufacturing the same, and liquid crystal display including the same |
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| KR1020050102835A KR100691039B1 (en) | 2005-10-31 | 2005-10-31 | A polarizer, manufacturing method thereof and a liquid crystal display having the same |
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| WO2015046999A1 (en) * | 2013-09-30 | 2015-04-02 | 주식회사 엘지화학 | Polarizing plate and image display apparatus comprising same |
| US9651716B2 (en) | 2013-09-30 | 2017-05-16 | Lg Chem, Ltd. | Polarizing plate and image display device comprising same |
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| CN104936708B (en) * | 2013-01-17 | 2017-08-11 | 阿姆斯特郎世界工业公司 | Curing and its product of preparation |
| KR20160001513A (en) * | 2014-06-27 | 2016-01-06 | 삼성전자주식회사 | Polarizing film and antireflection film and display device |
| TWI526505B (en) | 2014-09-11 | 2016-03-21 | 財團法人工業技術研究院 | Hardcoat composition and polarizer and display device applying the same |
| CN108490680B (en) * | 2018-03-29 | 2021-03-23 | 武汉华星光电技术有限公司 | Liquid crystal panel and manufacturing method thereof |
| JP7412972B2 (en) * | 2019-11-19 | 2024-01-15 | 日東電工株式会社 | Polarizing plate and polarizing plate roll |
| JP7412973B2 (en) * | 2019-11-19 | 2024-01-15 | 日東電工株式会社 | Polarizing plate and polarizing plate roll |
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| JP2003185841A (en) * | 2001-12-19 | 2003-07-03 | Fuji Photo Film Co Ltd | Polarizing plate with cured coating film, device for manufacturing the same, and liquid crystal display |
| KR20040071213A (en) * | 2001-12-21 | 2004-08-11 | 소니 케미카루 가부시키가이샤 | Polarizing plate |
| KR20040073323A (en) * | 2003-02-12 | 2004-08-19 | 스미또모 가가꾸 고교 가부시끼가이샤 | Polarizer, process for preparing the same, optical member and liquid crystal displaying apparatus |
| JP2005010329A (en) * | 2003-06-18 | 2005-01-13 | Sony Chem Corp | Polarizing plate and liquid crystal display element |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015046999A1 (en) * | 2013-09-30 | 2015-04-02 | 주식회사 엘지화학 | Polarizing plate and image display apparatus comprising same |
| US9651716B2 (en) | 2013-09-30 | 2017-05-16 | Lg Chem, Ltd. | Polarizing plate and image display device comprising same |
| US10012772B2 (en) | 2013-09-30 | 2018-07-03 | Lg Chem, Ltd. | Polarizing plate and image display apparatus comprising same |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2007052912A1 (en) | 2007-05-10 |
| CN101317124A (en) | 2008-12-03 |
| TW200717048A (en) | 2007-05-01 |
| JP2009514009A (en) | 2009-04-02 |
| TWI315415B (en) | 2009-10-01 |
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