KR0163017B1 - Method for manufacturing reflection type polarized sheet - Google Patents

Method for manufacturing reflection type polarized sheet Download PDF

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Publication number
KR0163017B1
KR0163017B1 KR1019950000959A KR19950000959A KR0163017B1 KR 0163017 B1 KR0163017 B1 KR 0163017B1 KR 1019950000959 A KR1019950000959 A KR 1019950000959A KR 19950000959 A KR19950000959 A KR 19950000959A KR 0163017 B1 KR0163017 B1 KR 0163017B1
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film
adhesive
polyester film
added
polarizing
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KR1019950000959A
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KR960029839A (en
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여운길
임대우
조재은
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한형수
주식회사새한
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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
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/02—Materials and properties organic material
    • G02F2202/022—Materials and properties organic material polymeric

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Polarising Elements (AREA)

Abstract

본 발명은 전자계산기, 전자시계, 측정기기등의 표시장치인 액정표시 장치에 사용되는 반사형 편광판에 관한 것으로, 종래의 편광판에 흔히 나타나는 도포층의 손상이나 필름의 박리현상을 방지하기 위해 안출된 것이다.The present invention relates to a reflective polarizing plate used in a liquid crystal display device that is a display device such as an electronic calculator, an electronic clock, a measuring device, etc., and is designed to prevent damage to the coating layer or peeling phenomenon of the film, which is common in conventional polarizing plates. will be.

즉, 본 발명은 편광소자를 광학플라스틱 필름에 흡착 배향시킨 편광 필름의 한면에 입자를 첨가하지 않는 미연신 또는 일축연신의 투명 폴리에스테르 필름을 접착제로 합치시키고, 다른면에는 진주빛 안료가 첨가된 폴리에스테르 중합체를 미연신 또는 일축연신하여 제조된 투명 폴리에스테르 필름을 접착제로 합치시킨 후, 반사판을 진주빛 안료가 첨가된 폴리에스테르 필름이 합치된 다른면에 점착제로 점합시켜 제조된 반사형 편광판에 관한 것이다.That is, according to the present invention, an unstretched or uniaxially stretched transparent polyester film having no particles added to one side of the polarizing film having the polarizing element adsorbed and oriented on the optical plastic film is combined with an adhesive, and the pearlescent pigment is added to the other side. The transparent polyester film prepared by unstretching or uniaxially stretching the polyester polymer was matched with an adhesive, and then the reflecting plate was bonded to the other side where the polyester film with pearlescent pigment was added with an adhesive to a reflective polarizer prepared by It is about.

Description

반사형 편광판 제조방법Reflective polarizer manufacturing method

본 발명은 액정표시 장치에 사용되는 반사형 편광판에 관한 것으로서, 좀 더 구체적으로는, 입사광을 반사편광할 때 빛을 액정판넬 전체로 확산시키는 광확산능을 갖는 반사형 편광판의 제조방법에 대한 것이다. 근래 들어 전자계산기, 전자시계, 측정기기들은 소형화, 경량화에 따라 그의 표시 장치로서 종래에 사용되던 발광다이오드를 대신하여 얇고, 소비전력이 적은 액정표시 장치로 전환되고 있다. 또한, 전자기기의 장시간 사용을 위해 액정표시 장치의 구동 소비전력을 줄이기 위한 노력이 진행되고 있다. 저소비전력용 액정표시 장치에서 편광판은 후광(Backlight)이 없는 반사형 및 반투광형이 주로 사용되고 있다.The present invention relates to a reflective polarizing plate used in a liquid crystal display device, and more particularly, to a method of manufacturing a reflective polarizing plate having a light diffusing ability to diffuse light into the entire liquid crystal panel when reflecting polarized incident light. . Recently, electronic calculators, electronic clocks, and measuring devices have been converted to thinner, lower power consumption liquid crystal display devices in place of light emitting diodes, which are conventionally used as their display devices, due to their miniaturization and light weight. In addition, efforts have been made to reduce the driving power consumption of the liquid crystal display device for a long time use of the electronic device. In the liquid crystal display device for low power consumption, a reflective type and a semi-transmissive type having no backlight are mainly used.

액정표시 장치에 사용되는 편광판들은 편광필름을 보호하기 위해 아세테이트계 및 아크릴계 수지 등으로 만들어진 광학적 투명필름이 편광필름 표면에 설치되는 것이 일반적이다. 그러나 종래의 편광판을 전자계산기 또는 전자시계와 같이 사용환경 조건이 좋은 경우에는 별문제가 발생되지 않지만, 산업기계류등에 사용되는 가혹한 환경조건하에서는 내구성 및 열안정성등에 문제가 발생된다.In order to protect the polarizing film, the polarizing plates used in the liquid crystal display device are generally provided with an optical transparent film made of an acetate-based or acrylic resin on the surface of the polarizing film. However, if the use environment of the conventional polarizing plate is good, such as an electronic calculator or an electronic clock, it does not cause any problem, but under the harsh environmental conditions used for industrial machinery, problems such as durability and thermal stability.

따라서 상기와 같이 가혹한 환경조건에서도 내구성이나 열안정성등을 유지하기 위해 폴리비닐알콜필름으로 되어 있는 편광판의 공기와 접한 부분의 표면보호용으로 사용되고 있는 아세테이트계 및 아크릴 수지계 필름 대신에 기계적 강도나 치수안정성등 물리적 특성이 우수한 폴리에스테르 필름을 사용하는 기술이 제안되고 있는데, 폴리에스테르 필름을 표면보호용 필름으로 사용하는 경우, 연신조건에 따라서 광학특성이 변환되어 광간섭에 의한 편광판 표면의 색상이 변화될 수 있어 미연신 또는 일축연신된 폴리에스테르 필름을 사용하는 방법이 효과적인 것으로 알려지고 있다.Therefore, in order to maintain durability and thermal stability even in the harsh environmental conditions as described above, instead of acetate-based and acrylic resin-based films used for surface protection of air-contacting parts of polyvinyl alcohol film, mechanical strength and dimensional stability, etc. A technique using a polyester film having excellent physical properties has been proposed. When the polyester film is used as a surface protection film, optical properties may be converted according to stretching conditions, and thus the color of the surface of the polarizing plate may be changed by optical interference. Processes using unstretched or uniaxially stretched polyester films are known to be effective.

한편, 반사판과 편광필름 사이의 보호층은 반사광을 액정전체로 확산시키기 위하여 진주빛 안료를 사용하는데, 안료의 사용방법으로 진주빛 안료를 편광판 표면에 그대로 도포하거나, 일본특개소 제 55-046720 호에서와 같이 점착제 또는 접착제층에 혼합하여 편광판을 제조하는 방법 등이 제안되어 있다. 그러나, 이러한 방법들은 외부자극에 의해 도포층이 손상되거나, 점착제 또는 접착제의 접착력 저하 등으로 박리되는 등의 문제점이 발생한다.On the other hand, the protective layer between the reflecting plate and the polarizing film uses a pearlescent pigment in order to diffuse the reflected light to the entire liquid crystal, by using the pigment is applied to the surface of the polarizing plate as it is, or Japanese Patent Laid-Open No. 55-046720 As described above, a method of producing a polarizing plate by mixing with an adhesive or an adhesive layer has been proposed. However, these methods cause problems such as damage to the coating layer due to external stimulation, peeling due to the lowering of the adhesive strength of the adhesive or the adhesive, and the like.

본 발명은 상기와 같은 문제점을 해결하기 위해 안출된 것으로서, 편광판의 표면 보호용으로 미연신 또는 일축연신한 폴리에스테르 필름을 사용하는 한편, 반사판과 편광필름 사이에는 진주빛 안료가 첨가된 폴리에스테르 필름을 접합시켜 외부의 가혹한 조건하에서도 신뢰성이 우수하도록 한 것이다.The present invention has been made to solve the above problems, while using a non-stretched or uniaxially stretched polyester film for the surface protection of the polarizing plate, between the reflecting plate and the polarizing film, a polyester film with a pearlescent pigment is added Bonded to ensure excellent reliability even under harsh external conditions.

즉, 본 발명은 편광소자를 광학플라스틱 필름에 흡착 배양시킨 편광필름의 한면에 입자를 첨가하지 않은 투명의 미연신 또는 일축연신 폴리에스테르 필름을 접착, 합치시키고, 다른 면에는 진주빛 안료를 첨가한 투명의 미연신 또는 일축연신 폴리에스테르 필름을 접착 합치시킨 후, 합치된 진주빛 안료를 첨가한 폴리에스테르 필름의 다른 면에 반사판을 점착제로 점합하는 것을 특징으로 하는 반사형 편광판의 제조법에 관한 것으로서, 이하에서 상세히 설명한다.That is, in the present invention, a transparent, unstretched or uniaxially stretched polyester film containing no particles is adhered to and adhered to one side of the polarizing film in which the polarizing element is adsorbed and cultured on the optical plastic film, and the pearlescent pigment is added to the other side. A method for producing a reflective polarizing plate, comprising: adhesively bonding a transparent, unstretched or uniaxially stretched polyester film, and then sticking the reflecting plate with an adhesive on the other side of the polyester film to which the pearlescent pigment is added. It will be described in detail below.

본 발명에서 사용되는 폴리에스테르 필름은 테레프탈산을 주성분으로 하는 디카르보닐산 또는 에스테르 유도체와 에틸렌글리콜을 주성분으로 하는 글리콜을 에스테르 교환반응 또는 에스테르화하여 얻어진 저 중합체를 공지의 중합촉매를 사용하여 중축합하여 얻어진 폴리에스테르 중합체를 압출 성형하여 제조되는 것으로, 진주빛 안료를 첨가한 폴리에스테르 필름의 경우는 폴리에스테르 중합체 제조 중에 중합이 완료된 중합체에 상기 안료를 첨가 분산시켜 제조한다.The polyester film used in the present invention is obtained by polycondensing a low polymer obtained by transesterification or esterification of a dicarbonyl acid or ester derivative having terephthalic acid as a main component and a glycol having ethylene glycol as a main component using a known polymerization catalyst. The polyester polymer is produced by extrusion molding, and in the case of a polyester film to which a pearlescent pigment is added, the pigment is added to and dispersed in a polymer having been polymerized during the production of the polyester polymer.

본 발명에서 첨가되는 진주빛 안료는 무색투명한 백운모를 분쇄하여 그 크기가 1-50μ 정도로 만든 다음, 그 표면에 0.03∼0.08μ의 이산화티탄 미립자를 수화물로 만들어 도포하고, 소성시킨 박막상의 이산화티탄 피복 운모입자로서, 폴리에스테르 중합체에 투입되는 양은 0.5∼2.0중량％가 바람직하다. 안료의 함량이 0.5중량％ 이하이면 광학산 능력이 부족하여 액정표시 소자의 선명도가 떨어지며, 그 함량이 2.0중량％ 이상이 되면 폴리에스테르 필름의 헤이즈(Haze)가 높아져 입사광이 차단되므로 반사광량이 적어지는 단점이 있다.The pearlescent pigment added in the present invention is pulverized colorless and transparent white mica to make the size of about 1-50μ, then coated with 0.03 ~ 0.08μ titanium dioxide fine particles as a hydrate on the surface of the thin film coated titanium dioxide As mica particle, 0.5 to 2.0 weight% of the quantity injected into a polyester polymer is preferable. If the content of the pigment is 0.5% by weight or less, the optical acid capacity is insufficient, and the clarity of the liquid crystal display device is lowered. If the content is 2.0% by weight or more, the haze of the polyester film is increased and incident light is blocked, thereby reducing the amount of reflected light. There are disadvantages.

또한 무색투명한 운모의 크기는 작을수록 좋으며, 50μ 이상의 크기가 되면 표면 보호 필름의 흠집이 발생해 그 흠집이 편광판 표면에 전사되는 등의 단점이 있어 바람직하지 않다.In addition, the smaller the size of the colorless transparent mica, the larger the size of 50μ or more, the scratches of the surface protection film occurs, such that the scratches are transferred to the surface of the polarizing plate is not preferable.

또 발명에 사용되는 접착제로는 기존의 접착제로 사용되는 에폭시계 접착제, 폴리우레탄계 접착제, 폴리아크릴계 접착제 등이 사용 가능하며, 점착제로는 고무계 점착제, 아크릴계 점착제, 실리콘계 점착제 등이 모두 사용 가능하다.In addition, as the adhesive used in the invention, an epoxy adhesive, a polyurethane adhesive, a polyacrylic adhesive, or the like, which is used as an existing adhesive, may be used. The adhesive may be a rubber adhesive, an acrylic adhesive, a silicone adhesive, or the like.

또한, 반사판의 경우는 알루미늄판, 유리 또는 플라스틱 필름에 은, 알루미늄등을 증착한 증착필름 등이 사용 가능하나, 바람직하게는 알루미늄이 증착된 플라스틱필름을 사용하는 것이 좋다.In the case of the reflecting plate, a deposition film in which silver, aluminum, and the like are deposited on an aluminum plate, glass, or plastic film may be used, but preferably, a plastic film on which aluminum is deposited is used.

이하에서 실시예를 들어 본 발명을 더욱 상세히 설명한다. 하기 실시예 및 비교실시예에 대한 신뢰성 평가는 내습열성 평가로 하였으며, 그 조건은 40℃, 90RH％에서 250시간 방치 후 반사편광판의 기포 및 이물의 정도를 판단한 후, 반사판을 박리하고 점착제로 용제를 깨끗이 제거한 후 투과율 및 편광도를 다음 방법에 의해 측정하였다.Hereinafter, the present invention will be described in more detail with reference to Examples. Reliability evaluation of the following Examples and Comparative Examples was evaluated as the heat-and-moisture resistance evaluation, and the conditions were determined after 250 hours at 40 ℃, 90 RH% after determining the degree of bubbles and foreign matter of the reflective polarizing plate, peeling off the reflecting plate and the solvent as an adhesive After the removal, the transmittance and the polarization degree were measured by the following method.

＊단체투과율 : 400∼700㎚의 파장 영역에서 편광필름 1매의 투과율 측정 후 10㎚간격의 투과율을 합한 것의 평균값＊ Group transmittance: Average value of the sum of transmittances of 10 nm intervals after measuring the transmittance of one polarizing film in the wavelength range of 400 to 700 nm.

＊편광도 : (T0－T1)／(T0＋T1)의 제곱근* Polarization degree: Square root of (T0-T1) / (T0 + T1)

단, T0는 400∼700㎚의 파장영역에서 평균 평행 투과율이고,Provided that T0 is the average parallel transmittance in the wavelength region of 400 to 700 nm,

T1은 400∼700㎚의 파장영역에서 평균 직교 투과율임.T1 is the average orthogonal transmittance in the wavelength region of 400 to 700 nm.

[실시예 1]Example 1

단체투과율 43％, 편광도 94％인 폴리비닐알콜 편광필름을 무입자 일축 연신 폴리에스테르필름과 진주빛 안료를 1.0중량％ 함유한 일축 연신 폴리에스테르 필름으로 접착, 합치시킨 후 알루미늄이 증착된 폴리에스테르 필름으로 된 반사판을 진주빛 안료가 함유된 표면에 점합시켜 반사형 편광판을 제조하였다. 이에 대한 신뢰성 평가결과는 내습열성 평가 후 필름 표면의 결점 및 기포의 발생은 보이지 않았으며, 단체 투과율과 편광도의 측정결과 각각 44％, 94％로 측정되었다.Bonded polyvinyl alcohol polarizing film with a 43% single transmittance and 94% polarization with a uniaxially stretched polyester film containing 1.0 weight% of a particle-free uniaxially stretched polyester film and a pearlescent pigment, and then aluminum-deposited polyester A reflective plate made of a film was bonded to a surface containing a pearlescent pigment to prepare a reflective polarizing plate. Reliability evaluation results did not show defects and bubbles on the surface of the film after the heat and moisture resistance evaluation, it was measured as 44%, 94%, respectively, as a result of measurement of the transmittance and the degree of polarization.

[비교실시예 1]Comparative Example 1

단체투과율 43％, 편광도 94％인 폴리비닐알콜 편광필름을 보호필름으로 TAC필름을 양면에 접착시키고, 그 한쪽 면에 진주빛 안료를 1.0중량％ 함유한 점착제로 알루미늄 증착 폴리에스테르 필름을 점합시켜 반사형 편광판을 제조하였다. 이에 대한 내습열성 평가 결과, 작은 기포의 발생을 관찰할 수 있었으며, 점착부위가 가장 자리에서 박리현상이 나타났다. 또한 단체투과율과 편광도는 45％, 89％로 측정되어, 본발명에 따른 실시예 1보다 내구성이 약한 것으로 평가되었다.A polyvinyl alcohol polarizing film having a unit transmittance of 43% and a polarization degree of 94% was bonded to both surfaces of the TAC film with a protective film, and the aluminum-deposited polyester film was bonded with an adhesive containing 1.0 wt% of pearlescent pigment on one side thereof. A reflective polarizing plate was prepared. As a result of evaluating the moisture and heat resistance, small bubbles were observed, and peeling phenomenon was observed at the edge of the adhesive site. In addition, single transmittance and polarization degree were measured at 45% and 89%, and the durability was evaluated as weaker than Example 1 according to the present invention.

Claims (1)

편광소자를 광학플라스틱 필름에 흡착 배향시킨 편광필름의 한면에 입자를 첨가하지 않는 폴리에스테르 중합체를 압출 성형 후 미연신 또는 일축 연신하여 제조된 투명의 폴리에스테르 필름을 접착제로 합치시키고, 다른 면에서 진주빛 안료가 0.5∼2.0 중량％ 첨가된 폴리에스테르 중합체를 압출 성형 후 미연신 또는 일축 연신하여 제조된 투명의 폴리에스테르 필름을 접착제로 합치시킨 후, 반사판을 진주빛 안료가 첨가된 폴리에스테르 필름이 합치된 다른 면에 점착제로 점합하여 제조되는 공지의 반사형 편광판 제조공정에서, 폴리에스테르 중합체로 테레프탈산을 주성분으로하는 디카르보닐산 또는 그 유도체와 에틸렌글리콜을 주성분으로 하는 글리콜을 중합시켜 제조한 것을 사용하고, 진주빛 안료로 무색투명한 백운모를 1-50μ 크기로 분쇄하고 그 표면에 0.03∼0.08μ 크기의 이산화티탄 미립자를 수화물로 만들어 도포하고 소성시킨 이산화티탄 피복 운모입자를 사용하는 것을 특징으로 하는 반사형 편광판 제조방법.A transparent polyester film prepared by extruding an unpolymerized or uniaxially stretched polyester polymer that does not add particles to one side of the polarizing film by adsorbing and orienting the polarizing element on an optical plastic film is bonded with an adhesive, and the pearl on the other side. After the polyester polymer containing 0.5 to 2.0% by weight of the light pigment is added, the untranslated or uniaxially stretched polyester film is prepared by adhesive, and then the reflecting plate is matched with the pearlescent pigment-added polyester film. In the known reflective polarizer manufacturing process, which is prepared by gluing to the other side with a pressure-sensitive adhesive, a polymer produced by polymerizing dicarbonyl acid or a derivative thereof having terephthalic acid as a main component and a glycol having ethylene glycol as a main component is used as a polyester polymer. Crush colorless and transparent mica to 1-50μ size with pearlescent pigment A reflection type polarization plate manufacturing method to a surface characterized by using titanium dioxide coated mica particles which make the coating, and firing the titanium dioxide fine particles of 0.03~0.08μ size of a hydrate.
KR1019950000959A 1995-01-20 1995-01-20 Method for manufacturing reflection type polarized sheet KR0163017B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100618469B1 (en) * 1998-10-29 2007-04-25 주식회사 새 한 A light diffusive reflection and transmission type polarized sheet
KR100939947B1 (en) * 2004-08-02 2010-02-04 닛토덴코 가부시키가이샤 Phase-contrast adhesive layer, its manufacturing method, adhesive type optical film, its manufacturing method and image displaying device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100618468B1 (en) * 1999-08-02 2006-08-31 주식회사 새 한 Producing method of polarized light plate of light reflection and transmission type
KR100765145B1 (en) * 2001-09-17 2007-10-15 삼성전자주식회사 Liquid crystal display device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100618469B1 (en) * 1998-10-29 2007-04-25 주식회사 새 한 A light diffusive reflection and transmission type polarized sheet
KR100939947B1 (en) * 2004-08-02 2010-02-04 닛토덴코 가부시키가이샤 Phase-contrast adhesive layer, its manufacturing method, adhesive type optical film, its manufacturing method and image displaying device

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