KR20030093991A - The method for producing a laminated polarizing film - Google Patents

The method for producing a laminated polarizing film Download PDF

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Publication number
KR20030093991A
KR20030093991A KR10-2003-0034096A KR20030034096A KR20030093991A KR 20030093991 A KR20030093991 A KR 20030093991A KR 20030034096 A KR20030034096 A KR 20030034096A KR 20030093991 A KR20030093991 A KR 20030093991A
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film
polarizing film
laminated
linear
moisture content
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KR10-2003-0034096A
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Korean (ko)
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KR100984660B1 (en
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도미나가도시히꼬
마쯔모또다이스께
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스미또모 가가꾸 고오교오 가부시끼가이샤
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    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528Polarisers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/30Polarising elements

Abstract

실질적인 역 컬을 발생시키지 않는 적층 편광필름의 제조방법을 제공한다.Provided is a method for producing a laminated polarizing film that does not generate substantial reverse curl.

적층 전에 직선 편광분리필름의 수분율을 0.3∼0.8 중량%로 조정하는 수분율 조정공정을 갖는, 직선 편광필름과 직선 편광분리필름이 적층된 적층 편광필름의 제조방법으로 한다.It is set as the manufacturing method of the laminated polarizing film which laminated | stacked the linear polarizing film and the linear polarization separating film which has a moisture content adjusting process of adjusting the moisture content of a linear polarization separating film to 0.3-0.8 weight% before lamination | stacking.

Description

적층 편광필름의 제조방법 {THE METHOD FOR PRODUCING A LAMINATED POLARIZING FILM}Manufacturing method of laminated polarizing film {THE METHOD FOR PRODUCING A LAMINATED POLARIZING FILM}

본 발명은 액정표시패널을 구성하는 액정셀의 광원측 표면에 점착 적층시키는 적층 편광필름의 제조방법에 관한 것이다.The present invention relates to a method of manufacturing a laminated polarizing film that is adhesively laminated on a light source side surface of a liquid crystal cell constituting a liquid crystal display panel.

도 1 에 나타낸 바와 같이, 액정표시패널을 구성하는 액정셀의 광원측 표면에는 직선 편광필름이 점착되어 있다. 즉, 액정셀 (10) 의 광원측 표면에 접착제층 (12) 에 의해 직선 편광필름 (14) 이 점착 적층되어 액정표시패널이 구성된다. 액정표시패널은 해마다 화상이 더욱 선명할 것 또는 광원의 소비전력을 더욱 저감시킬 것이 요구되고 있다. 그래서, 액정표시패널의 광원의 소비전력을 저감시키기 위해서, 광원으로부터의 광을 효율적으로 이용하는 목적에서, 직선 편광필름의 광원측에, 직선 편광필름의 투과축에 평행하지 않은 광을 일단 반사시키고, 별도로 설치된 반사판에 의해 다시 반사된 광을 투과하는 직선 편광분리필름을 점착 적층시킨 적층 편광필름이 사용되고 있다. 현재로는 이 적층 편광필름은 한변이 최대한 150 ㎝ 정도이다.As illustrated in FIG. 1, a linear polarizing film is attached to the light source side surface of the liquid crystal cell constituting the liquid crystal display panel. That is, the linear polarizing film 14 is adhesively laminated by the adhesive bond layer 12 on the light source side surface of the liquid crystal cell 10, and a liquid crystal display panel is comprised. The liquid crystal display panel is required to have a clearer image or to reduce power consumption of the light source every year. Therefore, in order to reduce the power consumption of the light source of the liquid crystal display panel, for the purpose of efficiently utilizing the light from the light source, the light that is not parallel to the transmission axis of the linear polarizing film is reflected on the light source side of the linear polarizing film once, A laminated polarizing film in which a linearly polarized light separating film that transmits light reflected by the reflecting plate separately installed is adhesively laminated is used. At present, this laminated polarizing film has a maximum of about 150 cm on one side.

도 2 에는 적층 편광필름 (18) 의 구성예를 나타냈다. 직선 편광필름 (20) 과 직선 편광분리필름 (22) 이 접착제층 (24) 을 통해 점착 적층되어 있다.직선 편광필름 (20) 의 타측면에는 적층 편광필름을 액정셀에 점착하기 위한 접착제층 (26) 및 이 접착제층 (26) 을 보호하는 박리필름 (28) 이 형성되어 있다. 또, 직선 편광분리필름의 반대면에는 보호필름 (30) 이 적층되어 있다. 보호필름 (30) 은 최종 공정에서 박리 제거된다.The structural example of the laminated polarizing film 18 was shown in FIG. The linear polarizing film 20 and the linear polarizing film 22 are adhesively laminated through the adhesive layer 24. On the other side of the linear polarizing film 20, an adhesive layer for adhering the laminated polarizing film to the liquid crystal cell ( 26 and the release film 28 which protects this adhesive bond layer 26 are formed. In addition, the protective film 30 is laminated on the opposite surface of the linearly polarized light separating film. The protective film 30 is peeled off in the final process.

상기 구성을 갖는 적층 편광필름은 직선 편광필름과 직선 편광분리필름을 접착제로 적층시키는 공정을 거쳐 제조된다 (예컨대, 일본 공개특허공보 평 11-271534 호 (단락 [0005] ∼ [0007]) 및 특허 2000-275436 호 (단락 [0034]) 참조).The laminated polarizing film having the above structure is manufactured through a process of laminating a linear polarizing film and a linear polarizing separation film with an adhesive (for example, Japanese Patent Laid-Open No. 11-271534 (paragraphs [0005] to [0007]) and a patent 2000-275436 (paragraph [0034]).

그런데, 상기 공정을 거쳐 수득된 적층 편광필름을 방치하면, 액정셀에 점착되는 측인 직선 편광필름측 (도 2 의 A 면측) 이 오목해지듯이 컬 (이하, 「역 컬」이라고 함) 을 발생시키고, 이 역 컬은 적층 편광필름의 한변이 8 ㎝ 이상, 특히 20 ㎝ 인 경우에 현저한 것으로 판명되었다. 이 큰 역 컬은 박리필름 (28) 을 박리하여 액정셀 (10) 에 점착할 때에 접착면에 기포가 남기 쉬워 액정패널에 불량을 발행시키는 원인이 된다.By the way, when the laminated polarizing film obtained through the said process is left to stand, the linear polarizing film side (A surface side of FIG. 2) which is the side adhering to a liquid crystal cell will generate | occur | produce curl (henceforth "inverse curl"), as concave. This reverse curl turned out to be remarkable when one side of the laminated polarizing film was 8 cm or more, particularly 20 cm. This large inverse curl tends to leave bubbles on the adhesive surface when the peeling film 28 is peeled off and adhered to the liquid crystal cell 10, thereby causing defects in the liquid crystal panel.

그래서, 적층 편광필름은 실질적인 역 컬을 발생시키지 않고, 컬하지 않거나 또는 컬해도 직선 편광필름측이 볼록해지는 컬 (이하, 「정 컬」이라고 함) 이 되는 것이 요구된다.Therefore, the laminated polarizing film is required to be a curl (hereinafter, referred to as a "positive curl") in which the linear polarizing film side is convex even if it does not curl or curls without generating substantially reverse curl.

본 발명의 목적은 실질적인 역 컬을 발생시키지 않는 적층 편광필름의 제조방법을 제공하는 것이다.It is an object of the present invention to provide a method for producing a laminated polarizing film which does not generate substantial reverse curl.

도 1 은 액정셀에 편광필름을 적층한 구조를 예시한 단면도이다.1 is a cross-sectional view illustrating a structure in which a polarizing film is laminated on a liquid crystal cell.

도 2 는 적층 편광필름의 구성을 예시한 단면도이다.2 is a cross-sectional view illustrating the configuration of a laminated polarizing film.

도 3 은 직선 편광분리필름에 연속적으로 물 미스트를 분무하여 가습시키는 장치의 개략도이다.3 is a schematic diagram of an apparatus for humidifying by continuously spraying water mist on a linear polarization separating film.

[부호의 설명][Description of the code]

10 : 액정셀10: liquid crystal cell

12 : 접착제층12: adhesive layer

14 : 직선 편광필름14: linear polarizing film

18 : 적층 편광필름18: laminated polarizing film

20 : 직선 편광필름20: linear polarizing film

22 : 직선 편광분리필름22: linear polarized light separation film

24 : 접착제층24: adhesive layer

26 : 접착제층26: adhesive layer

28 : 박리필름28: release film

30 : 보호필름30: protective film

32 : 필름 송출롤32: film delivery roll

34 : 필름 권취롤34: film winding roll

36 : 미스트 분무장치36: mist sprayer

과제를 해결하기 위한 수단Means to solve the problem

본 발명자들은 상기 목적을 달성하기 위해서 실질적인 역 컬을 발생시키지 않는 적층 편광필름을 수득하기 위해서 예의 연구한 바, 직선 편광분리필름의 수분율을 일정 범위로 조정한 후에 직선 편광필름과 적층시킴으로써, 역 컬을 발생시키지 않는 적층 편광필름이 수득되는 것을 발견하여 본 발명을 완성시켰다.The present inventors earnestly studied in order to obtain a laminated polarizing film that does not generate substantial reverse curl in order to achieve the above object, by adjusting the moisture content of the linear polarized light separation film to a certain range, by laminating with the linear polarizing film, reverse curl The present invention was completed by discovering that a laminated polarizing film which does not generate a film is obtained.

즉, 본 발명은 직선 편광필름과 직선 편광분리필름이 적층된 적층 편광필름의 제조방법으로,That is, the present invention is a method of manufacturing a laminated polarizing film in which a linear polarizing film and a linear polarization separating film are laminated.

적층 전에 직선 편광분리필름의 수분율을 0.3 ∼ 0.8 중량% 로 조정하는 수분율 조정공정을 갖는 것을 특징으로 한다.It is characterized by having a moisture content adjustment process of adjusting the moisture content of a linearly polarized light separation film to 0.3-0.8 weight% before lamination.

본 발명의 방법에 의해, 실질적인 역 컬이 없는 적층 편광필름이 수득된다.By the method of the present invention, a laminated polarizing film free of substantial reverse curl is obtained.

여기서, 실질적인 역 컬이란 액정셀에 점착할 때에 기포가 남는 등의 불량을 발생시킬 정도의 역 컬을 의미하고, 약간의 역 컬은 허용되며 그 정도는 20 인치 크기의 적층 편광필름으로, 하기 컬량으로 약 1 ∼ 2 ㎜ 이다. 역 컬량이 약 3 ㎜ 이상이 되면 불량을 발생시키는 원인이 되어 바람직하지 않다.Here, the substantially reverse curl refers to a reverse curl that is enough to cause a defect such as bubbles remaining when adhering to the liquid crystal cell, and a slight reverse curl is allowed, and the degree is a laminated polarizing film having a size of 20 inches. About 1 to 2 mm. When the amount of reverse curl is about 3 mm or more, it causes a defect, which is not preferable.

발명의 실시형태Embodiment of the invention

본 발명에서는 직선 편광분리필름의 수분율을 0.3 ∼ 0.8 중량%, 보다 바람직하게는 0.4 ∼ 0.6 중량% 로 조정한 후에 직선 편광필름과 적층시킨다. 통상 직선 편광분리필름을 건조상태에서 가습시켜 소정의 수분율로 조정할 수 있으면 되고, 예컨대 필름을 물에 침지시키는 방법, 물을 안개 형상, 미스트 형상, 샤워 형상으로 접촉시키는 방법, 고습도 상태의 챔버 내를 통과시키거나 원반 (wholecloth) 을 고습도 상태의 챔버 내에 보존하는 방법 등으로 수분율을 조정하면 된다.In the present invention, the moisture content of the linear polarized light separating film is adjusted to 0.3 to 0.8% by weight, more preferably 0.4 to 0.6% by weight, and then laminated with the linear polarizing film. Normally, the linear polarization separation film can be humidified in a dry state and adjusted to a predetermined moisture content. For example, a method of immersing the film in water, a method of contacting the water in a fog shape, a mist shape, a shower shape, and a chamber in a high humidity state can be adjusted. The moisture content may be adjusted by passing through or preserving the wholecloth in a chamber of high humidity.

수분율의 조정방법으로, 직선 편광분리필름을 주행시키면서 필름 상에 수분을 미스트 형상으로 분무하여 행하는 방법이 바람직하게 사용된다. 수분을 부착시킨 필름은 감아서 정치시킨다. 필름은 일정 속도로 연속적으로 주행시키는 것이 바람직하다. 수분량을 변경하는 경우에는, 필름의 주행속도를 바꾸면 된다.As a method of adjusting the moisture content, a method of spraying water into a mist shape on the film while running the linear polarized light separating film is preferably used. The film to which moisture was affixed is wound up and left to stand. It is preferable to run the film continuously at a constant speed. What is necessary is just to change the running speed of a film, when changing moisture content.

직선 편광분리필름은 통상 보호필름이 점착된 상태에서 취급되고, 그 경우에는 수분을 보호필름 상에 분무하는 것이 바람직하다.The linear polarization separating film is usually handled in a state where the protective film is adhered, and in that case, it is preferable to spray moisture onto the protective film.

수분율은 일반적으로 수지나 무기분체의 수분율 측정에 사용되는 측정방법으로 측정한다. 구체적으로는 측정 대상물을 가열시켜 수분을 제거하고, 가열 전과 가열 후의 중량 차이에서 수분율을 구한다.Moisture content is generally measured by the measuring method used for measuring the moisture content of resin or inorganic powder. Specifically, the measurement object is heated to remove moisture, and the moisture content is determined from the difference in weight before heating and after heating.

상기 기술한 발명에서는 상기 직선 편광분리필름이 폴리에스테르 필름인 것이 바람직하다.In the above-described invention, it is preferable that the linear polarization separating film is a polyester film.

직선 편광분리필름은 폴리에스테르를 주성분으로 하는 필름이 바람직하고, 특히 폴리에틸렌나프탈레이트나 폴리에틸렌나프탈레이트 단위를 주성분으로 하는 공중합체를 원료로 하는 필름이 그 성능 관점에서 바람직하고, 예컨대 상품명 「DBEF」(스미토모 3M 사 제조) 로서 시판되고 있는 것을 예시할 수 있다. 이와 같은 폴리에스테르로 이루어진 직선 편광분리필름은, 제조 후 그대로 원반으로서 감겨져 공급되기 때문에, 원반 필름의 수분율은 실측하면 0.1 ∼ 0.2 중량% 이고, 그 필름의 포화 수분율 (약 0.8 중량%) 보다 낮아 수분율이 높은 직선 편광분리필름과 적층시켰을 때에 수분의 이행에 의해 역 컬이 더욱 발생하기 쉬운 것으로 생각된다.The linear polarization splitting film is preferably a film containing polyester as a main component, and a film based on polyethylene naphthalate or a copolymer containing polyethylene naphthalate unit as a main component is preferable from the viewpoint of its performance, and for example, the trade name "DBEF" ( What is marketed as Sumitomo 3M company) can be illustrated. Since the linear polarized light separating film made of such polyester is wound and supplied as a raw material after manufacture, the moisture content of the raw film is 0.1 to 0.2% by weight when measured, and is lower than the saturated moisture content (about 0.8% by weight) of the film. When laminated | stacked with this high linearly polarizing separation film, it is thought that reverse curl is more likely to arise by transfer of moisture.

또, 직선 편광분리필름은, 상기 기술한 바와 같이 투과축 방향에 평행한 광을 투과시키고, 투과축과 직교하는 반사축 방향에 평행한 광을 반사시키는 기능을 갖는 필름으로, 반사형 편광필름, 비흡수형 편광필름 또는 반사된 광이 재이용되어 휘도가 향상되므로 휘도 상승 필름이라고도 한다.In addition, the linearly polarized light separating film is a film having a function of transmitting light parallel to the transmission axis direction as described above and reflecting light parallel to the reflection axis direction orthogonal to the transmission axis. Since the non-absorptive polarizing film or the reflected light is reused to improve the brightness, it is also referred to as a brightness rising film.

한편, 이에 대하여 직선 편광필름은, 투과축 방향에 평행한 광을 투과시키고, 투과축과 직교하는 흡수축 방향에 평행한 광을 흡수시키는 기능을 갖는 필름으로, 흡수형 편광필름이라고도 한다.On the other hand, a linear polarizing film is a film which has a function which permeate | transmits light parallel to a transmission axis direction, and absorbs light parallel to the absorption axis direction orthogonal to a transmission axis, and is also called an absorption type polarizing film.

직선 편광필름은 공지된 직선 편광필름을 사용한다. 직선 편광필름은 통상 트리아세틸셀룰로오스 (TAC) 필름을 주재료로 하여 구성되고, 바람직한 구성으로는 TAC 필름과 폴리비닐알코올계 필름의 적층 필름, 구체적으로는 TAC 필름/폴리비닐알코올계 필름/TAC 필름의 3 층 이상의 구성을 갖는 것이 예시된다. 이들 직선 편광필름을 구성하는 수지 재료는 모두 극성이 높으며 포화 수분율이 높은 재료이다. 일반적으로 사용되는 상기와 같은 다층 구조의 직선 편광필름은 그 자체의 컬을 억제하기 위해서 수분율은 비교적 높게, 예컨대 2.5 중량% 정도로 조정된다. 이 때문에, 예컨대 건조상태의 폴리에스테르계 직선 편광분리필름과의 적층에 의해 수분이 직선 편광필름에서 직선 편광분리필름측으로 이행되어 컬이 발생하는 것으로 생각된다.The linear polarizing film uses a known linear polarizing film. A linear polarizing film is usually composed of a triacetyl cellulose (TAC) film as a main material, and a preferred configuration is a laminated film of a TAC film and a polyvinyl alcohol-based film, specifically, a TAC film / polyvinyl alcohol-based film / TAC film. It is illustrated having a configuration of three or more layers. The resin materials constituting these linear polarizing films are all materials having high polarity and high saturated moisture content. In general, a linear polarizing film having a multilayer structure as described above is adjusted to a relatively high moisture content, for example, about 2.5% by weight in order to suppress its own curl. For this reason, it is thought that moisture transfers from a linear polarizing film to a linear polarization separating film side, for example, by lamination | stacking with a polyester-type linear polarization separating film in a dry state, and curling arises.

직선 편광분리필름의 수분율을 조정하는 수분율 조정공정을 설정함으로써, 수득되는 적층 편광필름이 역 컬을 잘 발생시키지 않게 되는 이유는 명확하지 않지만, 수분율이 높은 직선 편광필름에서 수분율이 낮은 직선 편광분리필름으로 수분이 이행되는 것에 의한 각 필름의 치수 변화가 억제되는 것이 하나의 큰 원인으로 추정된다.It is not clear why the laminated polarizing film obtained does not easily generate inverse curl by setting the moisture content adjusting process for adjusting the moisture content of the linear polarization separating film, but the linear polarization separating film having a low moisture content in the linear polarization film having a high moisture content is not clear. It is presumed that one large cause is that the dimensional change of each film due to the transfer of moisture is suppressed.

통상 직선 편광분리필름의 한쪽면에 폴리에틸렌테레프탈레이트 등으로 이루어진 보호필름이 적층되어 있다. 직선 편광필름은 이 보호필름이 적층되어 있는 면과 반대인 면에 적층된다. 보호필름은 액정셀에 점착한 후에 박리 제거된다.Usually, a protective film made of polyethylene terephthalate or the like is laminated on one side of the linear polarized light separating film. The linear polarizing film is laminated on the surface opposite to the surface on which the protective film is laminated. The protective film is peeled off after sticking to the liquid crystal cell.

실시예Example

다음에, 본 발명의 구성과 효과를 구체적으로 나타내는 실시예 등에 대해 설명한다.Next, Examples, etc. which show the structure and effect of this invention concretely are demonstrated.

또, 컬량은 직선 편광필름측을 아래로 하여 평판 상에 놓았을 때에, 적층 편광필름의 4 정상점의, 평판으로부터의 높이의 평균값으로 구하였다. 플러스는 정 컬, 마이너스는 역 컬임을 나타낸다.Moreover, the curl amount was calculated | required as the average value of the height from the flat plate of 4 normal points of a laminated polarizing film, when the linear polarizing film side was put down on the flat plate. Plus indicates positive curl and minus reverse curl.

(실시예 1)(Example 1)

두께 132 ㎛ 의 폴리에틸렌테레프탈레이트제의 직선 편광분리필름 「DBEF」(스미토모 3M 사 제조, 한쪽면에 폴리에틸렌테레프탈레이트의 보호필름이 적층, 수분율 : 약 0.2 중량%) 를 308 ㎜ ×235 ㎜ 로 절단한 것을 5 개 준비하고, 각각을 상대습도 80%, 온도 20℃ 의 환경 하에서 24 시간 동안 방치하였다. 방치 후의수분율은 0.62 중량% 였다 (수분율은 보호필름을 박리하여 측정함). 이 직선 편광분리필름을 바로 방습포대에 넣어 밀봉하고, 2 시간 후에 꺼내어 보호필름이 적층되어 있지 않는 면에 직선 편광필름을 적층시켜 적층 편광필름을 수득하였다. 적층에는 점착 롤러를 사용하였다.The linear polarized light separating film "DBEF" made of polyethylene terephthalate (thickness 132 micrometers in thickness) (made by Sumitomo 3M, the protective film of polyethylene terephthalate laminated | stacked on one side, moisture content: about 0.2 weight%) was cut | disconnected to 308 mm x 235 mm. Five were prepared, and each was left to stand for 24 hours in an environment with a relative humidity of 80% and a temperature of 20 ° C. The moisture content after standing was 0.62 weight% (the moisture content is measured by peeling a protective film). The linear polarization separating film was immediately placed in a moisture-proof bag and sealed, taken out after 2 hours, and the linear polarizing film was laminated on the surface where the protective film was not laminated to obtain a laminated polarizing film. An adhesive roller was used for lamination.

사용된 직선 편광필름은 수분율이 2.5 중량% 이고, TAC/폴리비닐알코올계 필름/TAC (80 ㎛/25 ㎛/80 ㎛)의 3 층 구조를 가지며, 25 ㎛ 의 아크릴계 감압형 접착제층을 갖는 것이었다.The linear polarizing film used had a water content of 2.5% by weight, had a three-layer structure of TAC / polyvinyl alcohol-based film / TAC (80 μm / 25 μm / 80 μm), and had an acrylic pressure-sensitive adhesive layer of 25 μm. .

수득된 적층 편광필름을 방습포대에 넣어 밀봉하고, 20℃ 에서 표 1 에 나타낸 시간이 경과한 후에 꺼내어 컬량을 측정하였다. 컬량의 측정 결과는 표 1 에 나타냈다.The obtained laminated polarizing film was put into the moisture proof bag, and it sealed, and after the time shown in Table 1 passed at 20 degreeC, it took out and measured the curl amount. The measurement result of the curl amount was shown in Table 1.

(실시예 2)(Example 2)

직선 편광분리필름 「DBEF」를 상대습도 64%, 온도 22℃ 의 환경 하에서 24 시간 동안 방치시켰다. 방치 후의 수분율은 0.50 중량% 였다(수분율은 보호필름을 박리하여 측정함). 이 직선 편광분리필름을 사용한 것 이외에는, 실시예 1 과 완전히 동일한 방법으로 적층 편광필름을 제작하였다.The linear polarization separating film "DBEF" was left to stand for 24 hours in an environment with a relative humidity of 64% and a temperature of 22 ° C. The moisture content after standing was 0.50 weight% (moisture content is measured by peeling a protective film). A laminated polarizing film was produced in the same manner as in Example 1 except that this linearly polarized light separating film was used.

수득된 적층 편광필름을 방습포대에 넣어 밀봉하고, 20℃ 에서 표 1 에 나타낸 시간이 경과한 후에 꺼내어 컬량을 측정하였다. 측정 결과는 표 1 에 나타냈다.The obtained laminated polarizing film was put into the moisture proof bag, and it sealed, and after the time shown in Table 1 passed at 20 degreeC, it took out and measured the curl amount. The measurement results are shown in Table 1.

(비교예 1)(Comparative Example 1)

두께 132 ㎛ 의 직선 편광분리필름 「DBEF」(수분율 0.17 중량%) 를 308 ㎜×235 ㎜ 로 절단한 것을 5 개 준비하고, 상대습도 24%, 온도 22℃ 의 환경 하에서 24 시간 동안 방치한 결과, 수분율은 0.17 중량% 그대로였다 (수분율은 보호필름을 박리하여 측정함).As a result of preparing five pieces of the linearly polarized light separation film "DBEF" (water content 0.17% by weight) having a thickness of 132 µm in 308 mm x 235 mm, and leaving them for 24 hours in an environment with a relative humidity of 24% and a temperature of 22 ° C, The moisture content was 0.17 weight% as it was (the moisture content is measured by peeling a protective film).

직선 편광분리필름으로 상기 수분율 0.17 중량% 의 필름을 사용한 것 이외에는, 실시예 1 과 완전히 동일한 방법으로 적층 편광필름을 제작하였다.A laminated polarizing film was produced in exactly the same manner as in Example 1 except that the film having a moisture content of 0.17% by weight was used as the linear polarization separating film.

수득된 적층 편광필름을 방습포대에 넣어 밀봉하고, 20℃ 에서 표 1 에 나타낸 시간이 경과한 후에 꺼내어 컬량을 측정하였다. 컬량의 측정 결과는 표 1 에 나타냈다.The obtained laminated polarizing film was put into the moisture proof bag, and it sealed, and after the time shown in Table 1 passed at 20 degreeC, it took out and measured the curl amount. The measurement result of the curl amount was shown in Table 1.

실시예 1Example 1 실시예 2Example 2 비교예 3Comparative Example 3 수분율 (중량%)Moisture content (wt%) 0.620.62 0.500.50 0.170.17 경과시간 (시간)Elapsed time (hours) 00 0.50.5 0.30.3 0.00.0 1313 9.19.1 3.83.8 -4.7-4.7 2323 9.69.6 4.54.5 -5.0-5.0 8585 9.79.7 4.94.9 -4.3-4.3 253253 8.98.9 4.04.0 -3.6-3.6

표 1 의 결과에서, 직선 편광분리필름을 가습시켜 수분율을 조정한 후에, 직선 편광필름과 적층된 본 발명의 적층 편광필름은 모두 정 컬을 하고, 액정셀과 점착할 때에 기포가 들어가지 않는 양호한 제품이었지만, 수분율 조정공정을 설정하지 않은 비교예의 적층 편광필름은 역 컬을 발생시켰다.From the results in Table 1, after the moisture was adjusted by humidifying the linear polarized light separating film, the laminated polarizing film of the present invention laminated with the linear polarizing film was all curled and satisfies no bubbles when adhering with the liquid crystal cell. Although it was a product, the laminated polarizing film of the comparative example which did not set the moisture content adjustment process produced the reverse curl.

(실시예 3)(Example 3)

도 3 에 나타낸 가습장치를 사용하여 직선 편광분리필름의 수분율을 조정하였다. 직선 편광분리필름을, 보호필름이 부착된 상태에서 일정 속도로 연속적으로 주행시키면서 수분을 보호필름 상에 스프레이하여 부착시키고, 그대로 다른코어에 감았다. 필름의 주행속도를 바꿔 수분의 부착량을 바꿨다. 감은 필름 롤을 2 일간 정치시켜 수분율을 조정한 직선 편광분리필름을 수득하였다.The moisture content of the linear polarizing separation film was adjusted using the humidifier shown in FIG. The linear polarized light separating film was sprayed onto the protective film while continuously running at a constant speed while the protective film was attached, and was then wound on another core. The running speed of the film was changed to change the amount of moisture attached. The rolled film roll was allowed to stand for 2 days to obtain a linear polarized light separating film in which the moisture content was adjusted.

직선 편광분리필름의 보호필름을 박리하여 수분율을 측정하였다.The moisture content was measured by peeling the protective film of the linear polarized light separation film.

수득된, 수분율 조정이 끝난 직선 편광분리필름을 바로 방습포대에 넣어 밀봉하고, 2 시간 후에 꺼내어 보호필름이 적층되어 있지 않는 면에 실시예 1 과 동일한 방법으로 직선 편광필름을 적층시켜 20 인치 크기 (420 ㎜ ×318 ㎜) 의 적층 편광필름을 수득하였다.The obtained moisture-adjusted linear polarization separating film was immediately placed in a moisture-proof bag and sealed, taken out after 2 hours, and the linear polarizing film was laminated in the same manner as in Example 1 on the surface where the protective film was not laminated. A laminated polarizing film of 420 mm x 318 mm) was obtained.

수득된 적층 편광필름을 방습포대에 넣어 밀봉하고, 20℃ 에서 65 시간 동안 경과시킨 후에 꺼내어 컬량을 측정하였다. 컬량의 측정 결과는 표 2 에 나타냈다.The obtained laminated polarizing film was put into the moisture proof bag, sealed, and after passing at 20 degreeC for 65 hours, it took out and measured the curl amount. The measurement result of the curl amount was shown in Table 2.

수분율 (중량%)Moisture content (wt%) 컬 값 (㎜) (점착후 65 시간)Curl value (mm) (65 hours after adhesion) 외관Exterior 사용 여부Whether or not to use 실시예 3Example 3 1One 0.300.30 -1.4-1.4 양호Good 가능possible 22 0.420.42 +0.4+0.4 양호Good 가능possible 33 0.610.61 +5.8+5.8 양호Good 가능possible 44 1.731.73 +13.9+13.9 양호Good 가능possible

수분율이 0.30 중량% 인 경우, 컬량이 -1.4 ㎜ 이고, 약간 역 컬되어 있지만, 허용 범위에 들어 있어 수득된 적층 편광필름은 문제없이 사용할 수 있었다.When the moisture content was 0.30% by weight, the curl amount was -1.4 mm and slightly reverse curled, but the laminated polarizing film obtained because it was in an acceptable range could be used without a problem.

본 발명의 방법에 따라 액정셀에 점착할 때에, 점착면에 기포가 남아 있어 액정패널에 불량을 발생시키는 원인인 실질적인 역 컬을 발생시키지 않는 직선 편광필름과 직선 편광분리필름으로 이루어진 적층 편광필름이 수득된다.When the adhesive is adhered to the liquid crystal cell according to the method of the present invention, a laminated polarizing film composed of a linear polarizing film and a linear polarizing separating film which does not generate substantial inverse curl, which causes bubbles to remain on the adhesive surface and causes defects in the liquid crystal panel. Obtained.

Claims (3)

직선 편광필름과 직선 편광분리필름이 적층된 적층 편광필름의 제조방법에 있어서,In the method of manufacturing a laminated polarizing film in which a linear polarizing film and a linear polarization separating film are laminated, 직선 편광필름과 직선 편광분리필름의 적층공정 전에, 상기 직선 편광분리필름의 수분율을 0.3 ∼ 0.8 중량% 로 조정하는 수분율 조정공정을 갖는 것을 특징으로 하는 적층 편광필름의 제조방법.A method for producing a laminated polarizing film, comprising a moisture content adjusting step of adjusting the moisture content of the linear polarizing film to 0.3 to 0.8% by weight before the step of laminating the linearly polarizing film and the linearly polarizing film. 제 1 항에 있어서, 상기 직선 편광분리필름이 폴리에스테르필름이고, 상기 직선 편광필름이 폴리비닐알코올계 필름과 트리아세틸셀룰로오스 필름의 적층 필름인, 적층 편광필름의 제조방법.The method of claim 1, wherein the linearly polarized light separating film is a polyester film, and the linearly polarized light film is a laminated film of a polyvinyl alcohol-based film and a triacetyl cellulose film. 제 1 항에 있어서, 수분율 조정을 직선 편광분리필름을 주행시키면서 필름 상에 수분을 미스트 형상으로 분무하여 행하는, 적층 편광필름의 제조방법.The method for producing a laminated polarizing film according to claim 1, wherein the moisture content is adjusted by spraying moisture on the film in a mist shape while running the linear polarization separating film.
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US10365420B2 (en) 2013-08-01 2019-07-30 Lg Chem, Ltd. Method for manufacturing polarizing film using ultrasonic vibrator for atomizing coating solution

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KR20160007389A (en) * 2014-07-11 2016-01-20 스미또모 가가꾸 가부시키가이샤 Polarizing plate and liquid crystal display device

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