TWI731133B - Set of polarizing plates - Google Patents
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Abstract
Description
本發明係關於偏光板之套組。 The present invention relates to a set of polarizing plates.
液晶顯示裝置，係活用其消耗電力低、以低電壓運作、輕量且薄型等特徵，而被使用在各種顯示用裝置。構成液晶顯示裝置之液晶面板，係具有一對偏光板積層於液晶單元的雙面之構成。 Liquid crystal display devices are used in various display devices by taking advantage of their low power consumption, low voltage operation, light weight, and thin profile. The liquid crystal panel constituting the liquid crystal display device has a structure in which a pair of polarizing plates are laminated on both sides of the liquid crystal cell.
尤其在可攜式用途的液晶面板中，為了在提升畫面的亮度的同時抑制消耗電力，配置在液晶單元的背面側之偏光板，有時會具備亮度提升膜。亮度提升膜，係具有當液晶顯示裝置的背光或其反射光入射時，使既定偏光軸的直線偏光或既定方向的圓偏光反射，並使其他光穿透之性質之膜。 In particular, in portable liquid crystal panels, in order to increase the brightness of the screen while suppressing power consumption, the polarizing plate arranged on the back side of the liquid crystal cell may be provided with a brightness enhancement film. The brightness enhancement film is a film with the property of reflecting the linearly polarized light of the predetermined polarization axis or the circularly polarized light of the predetermined direction and allowing other light to penetrate when the backlight of the liquid crystal display device or its reflected light is incident.
然而，當背面側偏光板具備亮度提升膜時，起因於在液晶單元的上下方所配置之偏光板之構件的不同，即使於常溫環境下，液晶面板亦產生翹曲，在將背光單元或蓋玻璃貼合於液晶面板時會有產生缺失之問題。最近，構成液晶單元之玻璃基板的厚度逐漸薄化之情況，更加速此問題的產生。 However, when the back-side polarizing plate is equipped with a brightness enhancement film, due to the difference in the components of the polarizing plate arranged above and below the liquid crystal cell, the liquid crystal panel will warp even in a normal temperature environment, and the backlight unit or the cover will be warped. When the glass is attached to the LCD panel, there will be a problem of missing. Recently, the gradual thinning of the thickness of the glass substrate constituting the liquid crystal cell has accelerated the occurrence of this problem.
例如，專利文獻1中，係揭示於配置在觀看側之偏光板與配置在背面側之偏光板中，使貼合於各自的偏光片之三乙酸纖維素膜的厚度不同，藉此減少液晶面板在常溫環境下的翹曲之方法。
For example, in
然而，在常溫環境下之翹曲的減少，仍有大幅的改善空間。再者，上述專利文獻1並未探討於實際使用時常常會留意之在高溫環境下的翹曲，專利文獻1所記載之偏光板，仍存在著在嚴苛環境下翹曲大之問題。
However, there is still room for substantial improvement in the reduction of warpage under normal temperature environment. Furthermore, the above-mentioned
[專利文獻1]日本特開2002-207211號公報 [Patent Document 1] JP 2002-207211 A
本發明之目的在於不僅可減少液晶面板在常溫環境下的翹曲，而容易進行液晶顯示裝置的製造，同時亦可減少液晶面板在高溫環境下的翹曲，而降低實際使用時之缺失。 The purpose of the present invention is not only to reduce the warpage of the liquid crystal panel in a normal temperature environment, but also to facilitate the manufacture of the liquid crystal display device, but also to reduce the warpage of the liquid crystal panel in a high temperature environment and reduce the defects in actual use.
[1]一種偏光板之套組，其係由配置在液晶單元的觀看側之觀看側偏光板、以及配置在液晶單元的背面側之背面側偏光板所構成者，其中，前述觀看側偏光板，依序具備第1保護膜、第1偏光 片及第2保護膜；前述背面側偏光板，依序具備第3保護膜、第2偏光片及亮度提升膜；從前述觀看側偏光板的厚度減去前述背面側偏光板的厚度之差為13μm以下；從前述第1偏光片的厚度減去前述第2偏光片的厚度之差超過0μm且為10μm以下。 [1] A polarizing plate set consisting of a viewing side polarizing plate arranged on the viewing side of a liquid crystal cell and a back side polarizing plate arranged on the back side of the liquid crystal cell, wherein the viewing side polarizing plate , With the first protective film and the first polarized light in sequence Sheet and a second protective film; the back side polarizing plate is provided with a third protective film, a second polarizer, and a brightness enhancement film in this order; from the thickness of the viewing side polarizing plate minus the difference of the thickness of the back side polarizing plate is 13 μm or less; the difference of the thickness of the second polarizer subtracted from the thickness of the first polarizer exceeds 0 μm and is 10 μm or less.
[2]如[1]所述之偏光板之套組，其中，前述第1偏光片的厚度為7μm以上15μm以下，前述第2偏光片的厚度為4μm以上12μm以下。 [2] The polarizing plate set according to [1], wherein the thickness of the first polarizer is 7 μm or more and 15 μm or less, and the thickness of the second polarizer is 4 μm or more and 12 μm or less.
[3]如[1]或[2]所述之偏光板之套組，其中，前述觀看側偏光板的厚度及前述背面側偏光板的厚度皆為100μm以下。 [3] The polarizing plate set according to [1] or [2], wherein the thickness of the viewing side polarizing plate and the thickness of the back side polarizing plate are both 100 μm or less.
[4]一種液晶面板，其係具有如[1]至[3]中任一項所述之偏光板之套組。 [4] A liquid crystal panel having the polarizing plate set as described in any one of [1] to [3].
根據本發明之偏光板之套組，不僅可減少液晶面板在常溫環境下的翹曲，同時亦可減少液晶面板在高溫環境下的翹曲。 The polarizing plate set according to the present invention can not only reduce the warpage of the liquid crystal panel in a normal temperature environment, but also reduce the warpage of the liquid crystal panel in a high temperature environment.
1‧‧‧觀看側偏光板 1‧‧‧Viewing side polarizer
2‧‧‧背面側偏光板 2‧‧‧Back side polarizing plate
10‧‧‧第1偏光片 10‧‧‧The first polarizer
11‧‧‧第2偏光片 11‧‧‧Second Polarizer
20‧‧‧第1保護膜 20‧‧‧The first protective film
21‧‧‧第2保護膜 21‧‧‧Second protective film
22‧‧‧第3保護膜 22‧‧‧The third protective film
30‧‧‧亮度提升膜 30‧‧‧Brightness enhancement film
40‧‧‧第1黏著劑層 40‧‧‧The first adhesive layer
41‧‧‧第2黏著劑層 41‧‧‧Second adhesive layer
42‧‧‧第3黏著劑層 42‧‧‧The third adhesive layer
50、51‧‧‧分隔片 50、51‧‧‧Separator
60、61‧‧‧防護膜 60、61‧‧‧Protective film
70‧‧‧測定處 70‧‧‧Determination Office
71‧‧‧偏光板 71‧‧‧Polarizer
72‧‧‧玻璃板 72‧‧‧Glass plate
100‧‧‧觀看側偏光板的厚度 100‧‧‧View the thickness of the side polarizer
200‧‧‧背面側偏光板的厚度 200‧‧‧The thickness of the back side polarizing plate
第1圖係顯示本發明之偏光板之套組的一例之剖面圖。 Fig. 1 is a cross-sectional view showing an example of the polarizing plate set of the present invention.
第2圖係顯示構成本發明之偏光板之套組之觀看側偏光板的一例之剖面圖。 Fig. 2 is a cross-sectional view showing an example of the viewing side polarizing plate constituting the polarizing plate set of the present invention.
第3圖係顯示構成本發明之偏光板之套組之背面側偏光板的一例之剖面圖。 Fig. 3 is a cross-sectional view showing an example of the back side polarizing plate constituting the polarizing plate set of the present invention.
第4圖係顯示本發明之液晶面板的一例之剖面圖。 Fig. 4 is a cross-sectional view showing an example of the liquid crystal panel of the present invention.
第5圖係顯示測定玻璃樣本的翹曲量之位置之平面圖。 Figure 5 is a plan view showing the position where the amount of warpage of the glass sample is measured.
邊參考適當的圖式邊說明本發明之偏光板之套組及液晶面板。本發明之偏光板之套組，具有配置在液晶單元的觀看側之觀看側偏光板以及配置在液晶單元的背面側之背面側偏光板。 The polarizing plate set and liquid crystal panel of the present invention will be described with reference to appropriate drawings. The polarizing plate set of the present invention has a viewing side polarizing plate arranged on the viewing side of the liquid crystal cell and a back side polarizing plate arranged on the back side of the liquid crystal cell.
一實施形態中，本發明之偏光板係具有第1圖所示之構件。第1圖所示之偏光板之套組具有觀看側偏光板1與背面側偏光板2。觀看側偏光板1，依序具備第1保護膜20、第1偏光片10、第2保護膜21、及第1黏著劑層40。背面側偏光板2，依序具備亮度提升膜30、第3黏著劑層42、第2偏光片11、第3保護膜22、及第2黏著劑層41。第1黏著劑層40及第2黏著劑層41，可為用以將各偏光板貼合於液晶單元之黏著劑(pressure-sensitive adhesive)層，由於最終會被組裝於液晶顯示裝置，所以在本發明中，該黏著劑層的厚度係算入偏光板的厚度中。
In one embodiment, the polarizing plate of the present invention has the member shown in Fig. 1. The polarizing plate set shown in FIG. 1 has a viewing
此外，如第2圖及第3圖所示，在直到將本發明之偏光板之套組貼合於液晶單元為止之期間，於第1黏著劑層40及第2黏著劑層41上，較佳係預先分別暫貼合分隔片50及分隔片51，於第1保護膜20及亮度提升膜
30上，較佳係預先分別暫貼合防護膜60及防護膜61。分隔片50、51及防護膜60、61，由於在液晶顯示裝置的製造過程中會被剝離，所以最終不會被組裝於液晶顯示裝置。因此，在本發明中，此等分隔片及防護膜的厚度不被算入偏光板的厚度中。具體而言，構成本發明之偏光板之套組之各偏光板的厚度，關於觀看側偏光板，例如第2圖所示之箭頭標記100為觀看側偏光板的厚度，關於背面側偏光板，例如第3圖所示之箭頭標記200為背面側偏光板的厚度。
In addition, as shown in Figs. 2 and 3, during the period until the polarizing plate set of the present invention is attached to the liquid crystal cell, the first
再者，第1圖中，係省略用以貼合偏光片與保護膜之接著劑層或黏著劑層。亦即，例如於第1保護膜20與第1偏光片之間，存在有圖中未顯示的接著劑層或黏著劑層。觀看側偏光板及背面側偏光板，亦可具備第1圖所示者之外的任意層。
Furthermore, in Figure 1, the adhesive layer or the adhesive layer for bonding the polarizer and the protective film is omitted. That is, for example, between the first
本發明之偏光板之套組中，從觀看側偏光板的厚度減去背面側偏光板的厚度之差為13μm以下，較佳為-2至13μm，尤佳為-2至10μm，更佳為1至10μm。此外，本發明之偏光板之套組中，從觀看側偏光板所具有之第1偏光片的厚度減去背面側偏光板所具有之第2偏光片的厚度之差超過0μm且為10μm以下，較佳係超過0μm且為7μm以下，尤佳係超過0μm且為5μm以下，可為1μm以上。第1偏光片的厚度，較佳係大於第2偏光片的厚度。 In the polarizing plate set of the present invention, the difference between the thickness of the viewing-side polarizing plate minus the thickness of the back-side polarizing plate is 13 μm or less, preferably -2 to 13 μm, particularly preferably -2 to 10 μm, and more preferably 1 to 10μm. In addition, in the set of polarizing plates of the present invention, the difference between the thickness of the first polarizing plate of the viewing-side polarizing plate and the thickness of the second polarizing plate of the back-side polarizing plate is more than 0 μm and 10 μm or less, It is preferably more than 0 μm and 7 μm or less, more preferably more than 0 μm and 5 μm or less, and may be 1 μm or more. The thickness of the first polarizer is preferably greater than the thickness of the second polarizer.
如此，藉由使偏光板及偏光片具有厚度 差，不僅可減少液晶面板在高溫環境下的翹曲，同時亦可抑制液晶面板在常溫環境下的翹曲。其理由雖仍無定論，但如後述般，認為係由於與偏光片設定厚度差互相影響，在常溫環境下可使構成偏光板之各構件之水分的進出達成一致之故。此外，認為在高溫環境下，當亮度提升膜為延伸膜時，在高溫環境下可使背面側偏光板的收縮力與觀看側偏光板的收縮力成為同等程度，所以可減少液晶面板的翹曲。 In this way, by making the polarizer and the polarizer have a thickness Poor, not only can reduce the warpage of the liquid crystal panel in a high temperature environment, but also can suppress the warpage of the liquid crystal panel in a normal temperature environment. Although the reason is still inconclusive, as will be described later, it is believed that the influence of the difference in the thickness of the set polarizer makes it possible to agree on the inflow and outflow of water from each member constituting the polarizer under a normal temperature environment. In addition, it is believed that in a high temperature environment, when the brightness enhancement film is a stretched film, the shrinkage force of the back side polarizing plate and the viewing side polarizing plate can be made to the same degree in a high temperature environment, so the warpage of the liquid crystal panel can be reduced .
本發明之偏光板之套組中，觀看側偏光板的水分率與背面側偏光板的水分率，較佳為5%以下，可為3%以下。本說明書中，偏光板的水分率為藉由乾燥減量法所測定之值。具體而言，測定於溫度23℃、濕度55%的環境下放置3日後之重量(乾燥前的重量)，然後測定於105℃的環境下靜置1小時後之重量(乾燥後的重量)，並根據下述式而計算出之值。觀看側偏光板的水分率，較佳係大於背面側偏光板的水分率，可大0.2%以上。 In the polarizing plate set of the present invention, the moisture content of the viewing side polarizing plate and the moisture content of the back side polarizing plate are preferably 5% or less, and may be 3% or less. In this manual, the moisture content of the polarizing plate is the value measured by the drying loss method. Specifically, the weight (weight before drying) after being left for 3 days in an environment with a temperature of 23°C and a humidity of 55% is measured, and then the weight after being left standing at 105°C for 1 hour (the weight after drying) is measured, And calculate the value according to the following formula. The moisture content of the viewing side polarizing plate is preferably greater than the moisture content of the back side polarizing plate, and may be greater than 0.2%.
水分率=100×[(乾燥前的重量)-(乾燥後的重量)]/乾燥前的重量 Moisture content=100×[(weight before drying)-(weight after drying)]/weight before drying
此外，觀看側偏光板的厚度與背面側偏光板的厚度之和，較佳為200μm以下，尤佳為170μm以下。下限並無特別限定，通常為100μm以上。藉由設為上述範圍，容易控制進出偏光板之水分。 In addition, the sum of the thickness of the viewing-side polarizing plate and the thickness of the back-side polarizing plate is preferably 200 μm or less, and particularly preferably 170 μm or less. The lower limit is not particularly limited, but is usually 100 μm or more. By setting the above range, it is easy to control the moisture entering and exiting the polarizing plate.
說明構成本發明之偏光板之套組的各構件。以下，有時將第1偏光片與第2偏光片總稱為偏光片， 有時將第1保護膜與第2保護膜與第3保護膜總稱為保護膜，有時將第1黏著劑層與第2黏著劑層與第3黏著劑層總稱為黏著劑層，有時將分隔片及防護膜總稱為表面保護膜。 The components constituting the polarizing plate set of the present invention will be described. Hereinafter, sometimes the first polarizer and the second polarizer are collectively referred to as polarizers. Sometimes the first protective film, the second protective film, and the third protective film are collectively referred to as the protective film, and sometimes the first adhesive layer, the second adhesive layer, and the third adhesive layer are collectively referred to as the adhesive layer. Sometimes The separator and the protective film are collectively referred to as the surface protective film.
(偏光片) (Polarizer)
本發明所使用之偏光片，通常係經過下列步驟而製得：將聚乙烯醇系樹脂膜進行單軸延伸之步驟、藉由以雙色性色素將聚乙烯醇系樹脂膜染色而使雙色性色素吸附之步驟、藉由硼酸水溶液來處理吸附有雙色性色素之聚乙烯醇系樹脂膜之步驟、以及於藉由硼酸水溶液所進行的處理後進行水洗之步驟。 The polarizer used in the present invention is usually prepared through the following steps: the step of uniaxially stretching the polyvinyl alcohol-based resin film, and dyeing the polyvinyl alcohol-based resin film with a dichroic dye to make the dichroic dye The step of adsorption, the step of treating the polyvinyl alcohol-based resin film with the dichroic dye adsorbed by the boric acid aqueous solution, and the step of washing with water after the treatment with the boric acid aqueous solution.
聚乙烯醇系樹脂，可使用使聚乙酸乙烯酯系樹脂皂化而成者。聚乙酸乙烯酯系樹脂，除了乙酸乙烯酯的均聚物之聚乙酸乙烯酯之外，亦可為乙酸乙烯酯以及可與此共聚合之其他單體之共聚物。就可與乙酸乙烯酯共聚合之其他單體而言，例如可列舉出不飽和羧酸類、烯烴類、乙烯基醚類、不飽和磺酸類以及具有銨基之丙烯醯胺類等。 As the polyvinyl alcohol-based resin, one obtained by saponifying a polyvinyl acetate-based resin can be used. Polyvinyl acetate-based resins, in addition to polyvinyl acetate, which is a homopolymer of vinyl acetate, can also be copolymers of vinyl acetate and other monomers copolymerizable therewith. Examples of other monomers that can be copolymerized with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.
聚乙烯醇系樹脂的皂化度，通常為85至100mol%左右，較佳為98mol%以上。此聚乙烯醇系樹脂可經改質，例如亦可使用經醛類改質之聚乙烯縮甲醛或聚乙烯縮乙醛等。此外，聚乙烯醇系樹脂的聚合度，通常為1,000至10,000左右，較佳為1,500至5,000左右。 The degree of saponification of the polyvinyl alcohol-based resin is usually about 85 to 100 mol%, preferably 98 mol% or more. This polyvinyl alcohol-based resin may be modified, for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may also be used. In addition, the degree of polymerization of the polyvinyl alcohol-based resin is usually 1,000 to 10,000 or so, preferably 1,500 to 5,000 or so.
將聚乙烯醇系樹脂進行製膜而成者，可用 作為偏光片的胚材膜。將聚乙烯醇系樹脂進行製膜之方法，可採用習知方法來製膜。聚乙烯醇系胚材膜的膜厚，若考量到將所得到之偏光片的厚度設為15μm以下，則較佳為5至35μm左右，尤佳為5至20μm。當胚材膜的膜厚為35μm以上時，於製造偏光片時須提高延伸倍率，此外，所得到之偏光片的尺寸收縮有增大之傾向。另一方面，當胚材膜的膜厚為5μm以下時，施行延伸時的處理性降低，於製造中有變得容易產生切斷等缺失之傾向。 Those made from polyvinyl alcohol-based resins can be used As the blank film of the polarizer. The method of forming a polyvinyl alcohol-based resin into a film can be formed by a conventional method. The thickness of the polyvinyl alcohol-based embryo material film is preferably about 5 to 35 μm, particularly preferably 5 to 20 μm, considering that the thickness of the obtained polarizer is 15 μm or less. When the thickness of the blank film is 35 μm or more, the stretching ratio must be increased when the polarizer is manufactured. In addition, the size shrinkage of the obtained polarizer tends to increase. On the other hand, when the film thickness of the blank material film is 5 μm or less, the handleability during stretching is reduced, and there is a tendency that defects such as cutting are likely to occur during manufacturing.
聚乙烯醇系樹脂膜的單軸延伸，可在雙色性色素的染色前、與染色同時、或是染色後進行。於染色後進行單軸延伸時，此單軸延伸可在硼酸處理前或硼酸處理中進行。此外，亦可於此等複數個階段中進行單軸延伸。 The uniaxial stretching of the polyvinyl alcohol-based resin film can be carried out before the dyeing of the dichroic dye, simultaneously with the dyeing, or after the dyeing. When uniaxial stretching is performed after dyeing, the uniaxial stretching can be performed before or during the boric acid treatment. In addition, uniaxial stretching can also be performed in these plural stages.
單軸延伸時，可在周速不同之輥間於單軸進行延伸之方法，亦可使用熱輥於單軸進行延伸。此外，單軸延伸可為在大氣中進行延伸之乾式延伸，亦可為使用溶劑並在使聚乙烯醇系樹脂膜膨潤之狀態下進行延伸之濕式延伸。延伸倍率通常為3至8倍左右。 In the case of uniaxial stretching, the method can be used for uniaxial stretching between rollers with different peripheral speeds, or by using a hot roller for uniaxial stretching. In addition, the uniaxial stretching may be dry stretching in the atmosphere, or wet stretching in a state where the polyvinyl alcohol-based resin film is swelled using a solvent. The stretching ratio is usually about 3 to 8 times.
藉由雙色性色素將聚乙烯醇系樹脂膜染色之方法，例如可採用將聚乙烯醇系樹脂膜浸漬在含有雙色性色素的水溶液之方法。雙色性色素，具體而言可採用碘或雙色性染料。聚乙烯醇系樹脂膜，於染色處理前，較佳係預先施以浸漬在水之處理。 The method of dyeing a polyvinyl alcohol resin film with a dichroic dye, for example, a method of immersing the polyvinyl alcohol resin film in an aqueous solution containing the dichroic dye can be used. Dichroic dyes, specifically, iodine or dichroic dyes can be used. The polyvinyl alcohol resin film is preferably immersed in water before dyeing.
當使用碘作為雙色性色素時，通常是採用將聚乙烯醇系樹脂膜浸漬在含有碘及碘化鉀之水溶液中而 進行染色之方法。此水溶液中之碘的含量，相對於水每100重量份，通常為0.01至1重量份左右。此外，碘化鉀的含量，相對於水每100重量份，通常為0.5至20重量份左右。染色所使用的水溶液的溫度，通常為20至40℃左右。此外，於水溶液中的浸漬時間(染色時間)，通常為20至1,800秒左右。 When iodine is used as a two-color pigment, it is usually used to immerse a polyvinyl alcohol resin film in an aqueous solution containing iodine and potassium iodide. The method of dyeing. The content of iodine in this aqueous solution is usually about 0.01 to 1 part by weight per 100 parts by weight of water. In addition, the content of potassium iodide is usually about 0.5 to 20 parts by weight per 100 parts by weight of water. The temperature of the aqueous solution used for dyeing is usually about 20 to 40°C. In addition, the immersion time (dyeing time) in the aqueous solution is usually about 20 to 1,800 seconds.
另一方面，當使用雙色性染料作為雙色性色素時，通常是採用將聚乙烯醇系樹脂膜浸漬在含有水溶性雙色性染料之水溶液中而進行染色之方法。此水溶液中之雙色性染料的含量，相對於水每100重量份，通常為1×10-4至10重量份左右，較佳為1×10-3至1重量份左右。此水溶液亦可含有硫酸鈉等無機鹽作為染色輔助劑。染色所使用之雙色性染料水溶液的溫度，通常為20至80℃左右。此外，於水溶液中的浸漬時間(染色時間)，通常為10至1,800秒左右。 On the other hand, when a dichroic dye is used as a dichroic dye, a method of immersing a polyvinyl alcohol-based resin film in an aqueous solution containing a water-soluble dichroic dye is usually adopted for dyeing. The content of the dichroic dye in the aqueous solution is usually about 1×10 -4 to 10 parts by weight per 100 parts by weight of water, preferably about 1×10 -3 to 1 part by weight. This aqueous solution may also contain inorganic salts such as sodium sulfate as a dyeing auxiliary. The temperature of the dichroic dye aqueous solution used for dyeing is usually about 20 to 80°C. In addition, the immersion time (dyeing time) in the aqueous solution is usually about 10 to 1,800 seconds.
藉由雙色性色素所進行的染色後之硼酸處理，通常是藉由將經染色之聚乙烯醇系樹脂膜浸漬在含硼酸之水溶液而進行。 The boric acid treatment after dyeing by a dichroic dye is usually performed by immersing the dyed polyvinyl alcohol-based resin film in an aqueous solution containing boric acid.
含硼酸之水溶液中之硼酸的量，相對於水每100重量份，通常為2至15重量份左右，較佳為5至12重量份。當使用碘作為雙色性色素時，此含硼酸之水溶液較佳係含有碘化鉀。含硼酸之水溶液中之碘化鉀的量，相對於水每100重量份，通常為0.1至15重量份左右，較佳為5至12重量份左右。於含硼酸之水溶液中的浸漬時 間，通常為60至1,200秒左右，較佳為150至600秒左右，尤佳為200至400秒左右。含硼酸之水溶液的溫度，通常為50℃以上，較佳為50至85℃，尤佳為60至80℃。 The amount of boric acid in the boric acid-containing aqueous solution is usually about 2 to 15 parts by weight, preferably 5 to 12 parts by weight per 100 parts by weight of water. When iodine is used as a dichroic pigment, the aqueous solution containing boric acid preferably contains potassium iodide. The amount of potassium iodide in the boric acid-containing aqueous solution is usually about 0.1 to 15 parts by weight, preferably about 5 to 12 parts by weight per 100 parts by weight of water. When immersed in an aqueous solution containing boric acid The time is usually about 60 to 1,200 seconds, preferably about 150 to 600 seconds, and particularly preferably about 200 to 400 seconds. The temperature of the boric acid-containing aqueous solution is usually above 50°C, preferably 50 to 85°C, and particularly preferably 60 to 80°C.
硼酸處理後之聚乙烯醇系樹脂膜，通常會進行水洗處理。水洗處理，例如可藉由將經硼酸處理之聚乙烯醇系樹脂膜浸漬在水中而進行。水洗處理中之水的溫度，通常為5至40℃左右。此外，浸漬時間通常為1至120秒左右。 The polyvinyl alcohol resin film after boric acid treatment is usually washed with water. The water washing treatment can be performed, for example, by immersing a polyvinyl alcohol-based resin film treated with boric acid in water. The temperature of the water in the water washing treatment is usually about 5 to 40°C. In addition, the immersion time is usually about 1 to 120 seconds.
水洗後施以乾燥處理，可得到偏光片。乾燥處理可使用熱風乾燥機或遠紅外線加熱器來進行。乾燥處理的溫度通常為30至100℃左右，較佳為50至80℃，乾燥處理的時間通常為60至600秒左右，較佳為120至600秒。 After washing with water, dry treatment is applied to obtain a polarizer. The drying process can be performed using a hot air dryer or a far infrared heater. The temperature of the drying treatment is usually about 30 to 100°C, preferably 50 to 80°C, and the time of the drying treatment is usually about 60 to 600 seconds, preferably about 120 to 600 seconds.
藉由乾燥處理，將偏光片的水分率降低至實用程度。該水分率通常為5至20重量%，較佳為8至15重量%。當水分率低於5重量%時，會失去偏光片的可撓性，偏光片於乾燥後有時會產生損傷或斷裂。此外，當水分率高於20重量%時，有時偏光片的熱穩定性會劣化。 The drying process reduces the moisture content of the polarizer to a practical level. The moisture content is usually 5 to 20% by weight, preferably 8 to 15% by weight. When the moisture content is less than 5% by weight, the flexibility of the polarizer will be lost, and the polarizer may be damaged or broken after drying. In addition, when the moisture content is higher than 20% by weight, the thermal stability of the polarizer may be deteriorated in some cases.
此外，偏光片的製造步驟中之聚乙烯醇系樹脂膜的延伸、染色、硼酸處理、水洗步驟、乾燥步驟，可依據例如日本特開2012-159778號所記載之方法來進行。此文獻記載的方法中，藉由將聚乙烯醇系樹脂塗佈於基材膜來形成會成為偏光片之聚乙烯醇系樹脂層。 In addition, the stretching, dyeing, boric acid treatment, water washing step, and drying step of the polyvinyl alcohol-based resin film in the manufacturing step of the polarizer can be performed according to, for example, the method described in JP 2012-159778. In the method described in this document, a polyvinyl alcohol-based resin layer that becomes a polarizer is formed by applying a polyvinyl alcohol-based resin to a base film.
降低偏光片本身的收縮力者亦為有效，第1 偏光片的厚度較佳為15μm以下，尤佳為7至15μm，更佳為10至13μm。同樣地，第2偏光片的厚度較佳為15μm以下，尤佳為4至12μm，更佳為5至10μm。 It is also effective to reduce the shrinkage force of the polarizer itself. The first The thickness of the polarizer is preferably 15 μm or less, particularly preferably 7 to 15 μm, and more preferably 10 to 13 μm. Similarly, the thickness of the second polarizer is preferably 15 μm or less, particularly preferably 4 to 12 μm, and more preferably 5 to 10 μm.
(保護膜) (Protective film)
保護膜是由樹脂膜所構成，更可由透明的樹脂膜所構成。特佳是由透明性、機械強度、熱穩定性、水分遮蔽性等優異之材料所構成。本說明書中，所謂透明的樹脂膜，意指於可見光區域中單體穿透率為80%以上之樹脂膜。 The protective film is composed of a resin film, and can be composed of a transparent resin film. Particularly good is made of materials with excellent transparency, mechanical strength, thermal stability, and moisture shielding properties. In this specification, the so-called transparent resin film means a resin film with a monomer transmittance of 80% or more in the visible light region.
形成保護膜之樹脂並無特別限定，例如可列舉出由甲基丙烯酸甲酯系樹脂、聚烯烴系樹脂、環狀烯烴系樹脂、聚氯乙烯系樹脂、纖維素系樹脂、苯乙烯系樹脂、丙烯腈-丁二烯-苯乙烯系樹脂、丙烯腈-苯乙烯系樹脂、聚乙酸乙烯酯系樹脂、聚偏二氯乙烯系樹脂、聚醯胺系樹脂、聚縮醛系樹脂、聚碳酸酯系樹脂、改質聚苯醚系樹脂、聚對苯二甲酸丁二酯系樹脂、聚對苯二甲酸乙二酯系樹脂、聚碸系樹脂、聚醚碸系樹脂、聚芳酯系樹脂、聚醯胺醯亞胺系樹脂、及聚醯亞胺系樹脂等所構成之膜。此等樹脂膜，可為由原料樹脂而製膜之膜，或是於製膜後進行橫向延伸所得到之單軸延伸膜，或是於製膜後進行縱向延伸，然後進行橫向延伸所得到之雙軸延伸膜等。 The resin forming the protective film is not particularly limited, and examples include methyl methacrylate resins, polyolefin resins, cyclic olefin resins, polyvinyl chloride resins, cellulose resins, and styrene resins. Acrylonitrile-butadiene-styrene resin, acrylonitrile-styrene resin, polyvinyl acetate resin, polyvinylidene chloride resin, polyamide resin, polyacetal resin, polycarbonate Based resins, modified polyphenylene ether based resins, polybutylene terephthalate based resins, polyethylene terephthalate based resins, polyether based resins, polyether terephthalate based resins, polyarylate based resins, A film composed of polyimide-based resin, polyimide-based resin, and the like. These resin films can be films made from raw resins, or uniaxially stretched films obtained by lateral stretching after film formation, or by longitudinal stretching and then lateral stretching after film formation. Biaxially stretched film, etc.
此等樹脂，可單獨使用或組合2種以上而使用。此外，此等樹脂亦可進行任意之適當的聚合物改質後使用，此聚合物改質，例如可列舉出共聚合、交聯、分子末端改質、立體規則性控制、以及包含伴隨著相異種聚合 物彼此的反應時之混合等的改質。 These resins can be used alone or in combination of two or more kinds. In addition, these resins can also be used after any appropriate polymer modification. The polymer modification includes, for example, copolymerization, crosslinking, molecular end modification, stereoregularity control, and inclusion of accompanying phases. Heterogeneous aggregation Modifications such as mixing at the time of the reaction between objects.
此等當中，保護膜的材料，較佳係使用甲基丙烯酸甲酯系樹脂、聚對苯二甲酸乙二酯系樹脂、聚烯烴系樹脂、或纖維素系樹脂。在此所謂聚烯烴系樹脂，包含鏈狀聚烯烴系樹脂及環狀聚烯烴系樹脂。 Among these, the material of the protective film is preferably methyl methacrylate resin, polyethylene terephthalate resin, polyolefin resin, or cellulose resin. The term "polyolefin resin" here includes chain polyolefin resin and cyclic polyolefin resin.
所謂甲基丙烯酸甲酯系樹脂，為含有50重量%以上的甲基丙烯酸甲酯單元之聚合物。甲基丙烯酸甲酯單元的含量，較佳為70重量%以上，可為100重量%。甲基丙烯酸甲酯單元為100重量%之聚合物，是使甲基丙烯酸甲酯單獨地聚合所得到之甲基丙烯酸甲酯均聚物。 The so-called methyl methacrylate resin is a polymer containing 50% by weight or more of methyl methacrylate units. The content of the methyl methacrylate unit is preferably 70% by weight or more, and may be 100% by weight. The methyl methacrylate unit is a 100% by weight polymer, and is a methyl methacrylate homopolymer obtained by separately polymerizing methyl methacrylate.
此甲基丙烯酸甲酯系樹脂，通常可藉由將以甲基丙烯酸甲酯為主成分之單官能單體，於自由基聚合起始劑的存在下聚合而得到。聚合時，可視需要使多官能單體或鏈轉移劑共存。 This methyl methacrylate resin is usually obtained by polymerizing a monofunctional monomer whose main component is methyl methacrylate in the presence of a radical polymerization initiator. During the polymerization, a multifunctional monomer or a chain transfer agent may coexist if necessary.
可與甲基丙烯酸甲酯共聚合之單官能單體，並無特別限定，例如可列舉出甲基丙烯酸乙酯、甲基丙烯酸丁酯、甲基丙烯酸環己酯、甲基丙烯酸苯酯、甲基丙烯酸苄酯、甲基丙烯酸2-乙基己酯、以及甲基丙烯酸2-羥乙酯等甲基丙烯酸甲酯以外的甲基丙烯酸酯類；丙烯酸甲酯、丙烯酸乙酯、丙烯酸丁酯、丙烯酸環己酯、丙烯酸苯酯、丙烯酸苄酯、丙烯酸2-乙基己酯、以及丙烯酸2-羥乙酯等丙烯酸酯類；2-(羥甲基)丙烯酸甲酯、3-(羥乙基)丙烯酸甲酯、2-(羥甲基)丙烯酸乙酯、以及2-(羥甲基)丙烯酸丁酯等羥烷基丙烯酸酯類；甲基丙烯酸及丙烯酸酯等不飽 和酸類；氯苯乙烯及溴苯乙烯等鹵化苯乙烯類；乙烯基甲苯及α-甲基苯乙烯等取代苯乙烯類；丙烯腈及甲基丙烯腈等不飽和腈類；順丁烯二酸酐及檸康酸酐等不飽和酸酐類；以及苯基順丁烯二醯亞胺及環己基順丁烯二醯亞胺等不飽和醯亞胺類等。如此單體可分別單獨使用或組合2種以上而使用。 Monofunctional monomers that can be copolymerized with methyl methacrylate are not particularly limited. Examples include ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, and methyl methacrylate. Methacrylates other than methyl methacrylate such as benzyl acrylate, 2-ethylhexyl methacrylate, and 2-hydroxyethyl methacrylate; methyl acrylate, ethyl acrylate, butyl acrylate, Acrylates such as cyclohexyl acrylate, phenyl acrylate, benzyl acrylate, 2-ethylhexyl acrylate, and 2-hydroxyethyl acrylate; 2-(hydroxymethyl)methyl acrylate, 3-(hydroxyethyl) ) Hydroxyalkyl acrylates such as methyl acrylate, 2-(hydroxymethyl) ethyl acrylate, and 2-(hydroxymethyl) butyl acrylate; methacrylic acid and acrylic acid esters are not saturated And acids; halogenated styrenes such as chlorostyrene and bromostyrene; substituted styrenes such as vinyl toluene and α-methylstyrene; unsaturated nitriles such as acrylonitrile and methacrylonitrile; maleic anhydride And unsaturated acid anhydrides such as citraconic acid anhydride; and unsaturated acid imines such as phenyl maleimide and cyclohexyl maleimide. Such a monomer can be used individually or in combination of 2 or more types, respectively.
可與甲基丙烯酸甲酯共聚合之多官能單體，並無特別限定，例如可列舉出二(甲基)丙烯酸乙二醇酯、二(甲基)丙烯酸二乙二醇酯、二(甲基)丙烯酸三乙二醇酯、二(甲基)丙烯酸四乙二醇酯、二(甲基)丙烯酸九乙二醇酯、及二(甲基)丙烯酸十四乙二醇酯等藉由丙烯酸或甲基丙烯酸將乙二醇或其低聚物的兩末端羥基經酯化者；藉由丙烯酸或甲基丙烯酸將丙二醇或其低聚物的兩末端羥基經酯化者；二(甲基)丙烯酸新戊二醇酯、二(甲基)丙烯酸己二醇酯、及二(甲基)丙烯酸丁二醇酯等藉由丙烯酸或甲基丙烯酸將二元醇的羥基經酯化者；藉由丙烯酸或甲基丙烯酸將雙酚A、雙酚A的環氧烷加成物、或是此等之鹵素取代物的兩末端羥基經酯化者；藉由丙烯酸或甲基丙烯酸將三羥甲基丙烷及新戊四醇等多元醇經酯化者；以及使丙烯酸縮水甘油酯或甲基丙烯酸縮水甘油酯的環氧基開環加成於此等多元醇的末端羥基而成者；使丙烯酸縮水甘油酯或甲基丙烯酸縮水甘油酯的環氧基開環加成於琥珀酸、己二酸、對苯二甲酸、鄰苯二甲酸、此等之鹵素取代物等二質子酸以及此等的環氧烷加成物等而成者；(甲基)丙烯酸烯 丙酯；以及二乙烯基苯等芳香族二乙烯基化合物等。當中，可較佳地使用二甲基丙烯酸乙二醇酯、二甲基丙烯酸四乙二醇酯、及二甲基丙烯酸新戊二醇酯。 The polyfunctional monomers copolymerizable with methyl methacrylate are not particularly limited. Examples include ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, and di(meth)acrylate. Base) triethylene glycol acrylate, tetraethylene glycol di(meth)acrylate, nonaethylene glycol di(meth)acrylate, and tetraethylene glycol di(meth)acrylate, etc. Or methacrylic acid esterified the two terminal hydroxyl groups of ethylene glycol or its oligomer; acrylic acid or methacrylic acid esterified the two terminal hydroxyl groups of propylene glycol or its oligomer; di(methyl) Neopentyl glycol acrylate, hexanediol di(meth)acrylate, butanediol di(meth)acrylate, etc., which are those that esterify the hydroxyl group of the diol by acrylic acid or methacrylic acid; by Acrylic acid or methacrylic acid esterified bisphenol A, alkylene oxide adducts of bisphenol A, or both terminal hydroxyl groups of these halogen substitutes; trimethylol Polyols such as propane and neopentylerythritol are esterified; and the epoxy groups of glycidyl acrylate or glycidyl methacrylate are ring-opened and added to the terminal hydroxyl groups of these polyols; and acrylic acid is condensed The epoxy groups of glycerides or glycidyl methacrylate are added to diprotic acids such as succinic acid, adipic acid, terephthalic acid, phthalic acid, and halogen substitutions such as succinic acid, adipic acid, terephthalic acid, etc. Oxyalkylene adducts, etc.; (meth)acrylic alkene Propyl ester; and aromatic divinyl compounds such as divinylbenzene. Among them, ethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, and neopentyl glycol dimethacrylate can be preferably used.
甲基丙烯酸甲酯系樹脂，亦可使用：進一步進行已共聚合於樹脂之官能基間的反應而經改質者。該反應，例如可列舉出丙烯酸甲酯的甲酯基與2-(羥甲基)丙烯酸甲酯的羥基之高分子鏈內脫甲醇縮合反應、或是丙烯酸的羧基與2-(羥甲基)丙烯酸甲酯的羥基之高分子鏈內脫水縮合反應等。 Methyl methacrylate-based resins can also be used: those that have been further modified by the reaction between the functional groups that have been copolymerized in the resin. This reaction includes, for example, the intra-polymer chain demethanol condensation reaction between the methyl acrylate group of methyl acrylate and the hydroxyl group of methyl 2-(hydroxymethyl)acrylate, or the carboxyl group of acrylic acid and 2-(hydroxymethyl) The dehydration condensation reaction in the polymer chain of the hydroxyl group of methyl acrylate, etc.
所謂聚對苯二甲酸乙二酯系樹脂，意指重複單元的80mol%以上由對苯二甲酸乙二酯所構成之樹脂，亦可含有其他二羧酸成分與二醇成分。其他二羧酸成分並無特別限定，例如可列舉出間苯二甲酸、4,4’-二羧基二苯、4,4’-二羧基二苯基酮、雙(4-羧苯基)乙烷、己二酸、癸二酸、及1,4-二羧基環己烷等。 The term "polyethylene terephthalate resin" means a resin in which 80 mol% or more of the repeating unit is composed of ethylene terephthalate, and it may also contain other dicarboxylic acid components and glycol components. Other dicarboxylic acid components are not particularly limited, and examples include isophthalic acid, 4,4'-dicarboxydiphenyl, 4,4'-dicarboxydiphenyl ketone, and bis(4-carboxyphenyl)ethyl Alkanes, adipic acid, sebacic acid, and 1,4-dicarboxycyclohexane, etc.
其他二醇成分並無特別限定，可列舉出丙二醇、丁二醇、新戊二醇、二乙二醇、環己烷二醇、雙酚A的環氧乙烷加成物、聚乙二醇、聚丙二醇、及聚四亞甲二醇等。 Other glycol components are not particularly limited, and examples include propylene glycol, butylene glycol, neopentyl glycol, diethylene glycol, cyclohexanediol, ethylene oxide adducts of bisphenol A, and polyethylene glycol , Polypropylene glycol, and polytetramethylene glycol, etc.
此等二羧酸成分或二醇成分，可視需要組合2種以上而使用。此外，亦可併用對羥基苯甲酸、對-β-羥基乙氧基苯甲酸等羥基羧酸。此外，就其他共聚合成分而言，亦可使用含有少量的醯胺鍵、胺甲酸酯鍵、醚鍵、或碳酸酯鍵等之二羧酸成分或二醇成分。 These dicarboxylic acid components or diol components can be used in combination of two or more types as necessary. In addition, hydroxycarboxylic acids such as p-hydroxybenzoic acid and p-β-hydroxyethoxybenzoic acid can also be used in combination. In addition, as for other copolymerization components, a dicarboxylic acid component or a diol component containing a small amount of amide bonds, urethane bonds, ether bonds, or carbonate bonds may also be used.
聚對苯二甲酸乙二酯系樹脂的製造方法，可採用：使對苯二甲酸及乙二醇(以及視需要之其他二羧酸或其他二醇)直接聚縮合之方法；使對苯二甲酸的二烷酯及乙二醇(以及視需要之其他二羧酸的二烷酯或其他二醇)進行酯交換反應後進行聚縮合之方法；以及在觸媒的存在下，使對苯二甲酸(以及視需要之其他二羧酸)的乙二醇酯(以及視需要之其他二醇酯)進行聚縮合之方法等。再者，亦可視需要進行固相聚合以提升分子量或減少低分子量成分。 The method of manufacturing polyethylene terephthalate resin can be: direct polycondensation of terephthalic acid and ethylene glycol (and other dicarboxylic acids or other diols if necessary); The dialkyl ester of formic acid and ethylene glycol (and optionally the dialkyl ester of other dicarboxylic acids or other diols) are transesterified and then polycondensed; and in the presence of a catalyst, the terephthalic acid Methods of polycondensation of ethylene glycol esters of formic acid (and other dicarboxylic acids as required) (and other diol esters as required), etc. Furthermore, if necessary, solid-phase polymerization may be carried out to increase the molecular weight or reduce the low molecular weight components.
環狀聚烯烴系樹脂，例如在觸媒的存在下，使降莰烯及其他環戊二烯衍生物等環狀烯烴單體聚合所得到者。使用如此環狀聚烯烴系樹脂，容易得到具有後述既定的阻滯值之保護膜，故較佳。 The cyclic polyolefin-based resin is, for example, one obtained by polymerizing cyclic olefin monomers such as norbornene and other cyclopentadiene derivatives in the presence of a catalyst. The use of such a cyclic polyolefin-based resin makes it easy to obtain a protective film having a predetermined retardation value described later, which is preferable.
環狀聚烯烴系樹脂，例如可列舉出：將藉由狄耳士-阿德爾反應(Diels-Alder Reaction)從環戊二烯與烯烴類或者(甲基)丙烯酸或其酯類而得到之降莰烯或其衍生物，作為單體來進行開環移位聚合，然後藉由氫化而得到之樹脂；將藉由狄耳士-阿德爾反應從二環戊二烯與烯烴類或者(甲基)丙烯酸或其酯類而得到之四環十二烯或其衍生物，作為單體來進行開環移位聚合，然後藉由氫化而得到之樹脂；使選自降莰烯、四環十二烯、此等之衍生物、及其他環狀烯烴單體之至少2種單體，同樣地進行開環移位共聚合，然後藉由氫化而得到之樹脂；將鏈狀烯烴及/或具有乙烯基之芳香族化合物，加成共聚合於如降莰烯、 四環十二烯、或此等之衍生物等環狀烯烴而得到之樹脂等。 Examples of cyclic polyolefin resins include: Diels-Alder Reaction (Diels-Alder Reaction) from cyclopentadiene and olefins or (meth)acrylic acid or its esters. Camphene or its derivatives are used as monomers to undergo ring-opening translocation polymerization, and then hydrogenated to obtain resins; through the Diels-Alder reaction from dicyclopentadiene and olefins or (methyl) ) Tetracyclododecene or its derivatives obtained from acrylic acid or its esters, as a monomer for ring-opening translocation polymerization, and then hydrogenated to obtain a resin; selected from norbornene, tetracyclododecene At least two monomers of olefins, these derivatives, and other cyclic olefin monomers are similarly subjected to ring-opening translocation copolymerization and then hydrogenated to obtain resins; the chain olefins and/or ethylene Base aromatic compounds, addition copolymerization in such as norbornene, Resins etc. obtained from cyclic olefins such as tetracyclododecene or these derivatives.
鏈狀聚烯烴系樹脂的典型例子，為聚乙烯系樹脂及聚丙烯系樹脂。當中，可較佳地使用丙烯的均聚物，或是以丙烯為主體並以1至20重量%、較佳為3至10重量%的比率使可與丙烯共聚合之共單體(例如乙烯)共聚合而成之共聚物。 Typical examples of chain polyolefin resins are polyethylene resins and polypropylene resins. Among them, a homopolymer of propylene can be preferably used, or a propylene-based comonomer (such as ethylene) can be copolymerized with propylene at a ratio of 1 to 20% by weight, preferably 3 to 10% by weight. ) Copolymer formed by copolymerization.
聚丙烯系樹脂，可含有脂環族飽和烴樹脂。藉由含有脂環族飽和烴樹脂，容易控制阻滯值。脂環族飽和烴樹脂的含量，相對於聚丙烯系樹脂，較有利為0.1至30重量%，尤佳的含量為3至20重量%。當脂環族飽和烴樹脂的含量未達0.1重量%時，無法充分得到控制阻滯值之效果，另一方面，該含量超過30重量%時，會有脂環族飽和烴樹脂隨時間經過從第2保護膜滲出之疑慮。 The polypropylene resin may contain alicyclic saturated hydrocarbon resin. By containing alicyclic saturated hydrocarbon resin, it is easy to control the retardation value. The content of the alicyclic saturated hydrocarbon resin is preferably 0.1 to 30% by weight, and particularly preferably 3 to 20% by weight, relative to the polypropylene resin. When the content of the alicyclic saturated hydrocarbon resin is less than 0.1% by weight, the effect of controlling the retardation value cannot be sufficiently obtained. On the other hand, when the content exceeds 30% by weight, the alicyclic saturated hydrocarbon resin may change over time. Doubts about the second protective film oozing out.
纖維素系樹脂，意指從棉絨或木漿(闊葉樹木漿、針葉樹木漿)等原料纖維素所得之纖維素的羥基中之氫原子的一部分或全部經乙醯基、丙醯基及/或丁醯基所取代之纖維素有機酸酯或纖維素混合有機酸酯。例如可列舉出由纖維素的乙酸酯、丙酸酯、丁酸酯、及此等之混合酯等所構成者。當中較佳為三乙酸纖維素膜、二乙酸纖維素膜、乙酸丙酸纖維素膜、以及乙酸丁酸纖維素膜等。 Cellulose resin means that part or all of the hydrogen atoms in the hydroxyl groups of cellulose obtained from raw cellulose such as cotton linter or wood pulp (hardwood pulp, coniferous wood pulp) have been passed through acetyl, propylene, and/ Or cellulose organic acid ester or cellulose mixed organic acid ester substituted by butyryl group. For example, those composed of cellulose acetate, propionate, butyrate, mixed esters of these, and the like can be cited. Among them, cellulose triacetate film, cellulose diacetate film, cellulose acetate propionate film, and cellulose acetate butyrate film are preferred.
將甲基丙烯酸甲酯系樹脂、聚對苯二甲酸乙二酯系樹脂、聚烯烴系樹脂、及纖維素系樹脂形成為用以接著於偏光片之第2保護膜之方法，可適當地選擇因應各樹脂之方法，並無特別限定。例如可採用：將溶解於溶 劑之樹脂澆注於金屬製帶或滾筒，並將溶劑乾燥去除而得到膜之溶劑澆注法；以及將樹脂加熱至其熔融溫度以上並混練，從模具中擠壓出並冷卻而得到膜之熔融擠製法。此熔融擠製法中，可為單層膜的擠製或是多層膜的同時擠製。 The method of forming methyl methacrylate-based resin, polyethylene terephthalate-based resin, polyolefin-based resin, and cellulose-based resin as the second protective film to be attached to the polarizer can be appropriately selected There is no particular limitation on the method of responding to each resin. For example, it can be used: dissolve in the solvent Solvent casting method in which the resin of the agent is poured on a metal belt or roller, and the solvent is dried and removed to obtain a film; and the resin is heated to above its melting temperature and kneaded, extruded from the mold and cooled to obtain the molten extrusion of the film System of law. In this melt extrusion method, it can be the extrusion of a single-layer film or the simultaneous extrusion of a multi-layer film.
用作為保護膜之膜，可容易取得市售品，就甲基丙烯酸甲酯系樹脂膜而言，分別以商品名稱表示，可列舉出：Sumipex(住友化學股份有限公司製)、Acrylite(註冊商標)、Acryplen(註冊商標)(以上為Mitsubishi Rayon股份有限公司製)、Delaglas(註冊商標)(旭化成股份有限公司製)、Paraglas(註冊商標)、Comoglas(註冊商標)(以上為Kuraray股份有限公司製)、以及Acryviewa(註冊商標)(日本觸媒股份有限公司製)等。就聚烯烴系樹脂膜而言，分別以商品名稱表示，可列舉出：Zeonor(註冊商標)(Zeon Japan股份有限公司製)、Arton(註冊商標)(JSR股份有限公司製)等。就聚對苯二甲酸乙二酯系樹脂膜而言，分別以商品名稱表示，可列舉出：Novaclear(註冊商標)(三菱化學股份有限公司製)及Teijin A-PET Sheet(帝人化成股份有限公司製)等。就聚丙烯系樹脂膜而言，分別以商品名稱表示，可列舉出：FILMAX CPP膜(FILMAX公司製)、Sun Tox(註冊商標)(Sun Tox股份有限公司製)、Tohcello(註冊商標)(Tohcello股份有限公司製)、Toyobo Pylen Film(註冊商標)(東洋紡績股份有限公司製)、Torayfan(註冊商標)(Toray Advanced Film股份有限公司製)、Nihon Polyace(註冊商標)、(Nihon Polyace股份有限公司製)、以及太閣FC(註冊 商標)(Futamura Chemical股份有限公司製)等。此外，就纖維素系樹脂膜而言，分別以商品名稱表示，可列舉出：Fujitac(註冊商標)TD(Fuji Film股份有限公司製)、以及KC2UA及Konica Minolta TAC Film KC(Konica Minolta股份有限公司製)等。 The film used as a protective film is easily available on the market. For methyl methacrylate resin films, they are represented by trade names, including: Sumipex (manufactured by Sumitomo Chemical Co., Ltd.), Acrylite (registered trademark) ), Acryplen (registered trademark) (the above are manufactured by Mitsubishi Rayon Co., Ltd.), Delaglas (registered trademark) (made by Asahi Kasei Co., Ltd.), Paraglas (registered trademark), Comoglas (registered trademark) (the above are manufactured by Kuraray Co., Ltd. ), and Acryviewa (registered trademark) (manufactured by Nippon Shokubai Co., Ltd.), etc. Polyolefin-based resin films are represented by trade names, and include Zeonor (registered trademark) (made by Zeon Japan Co., Ltd.), Arton (registered trademark) (made by JSR Co., Ltd.), and the like. Regarding the polyethylene terephthalate-based resin film, it is indicated by the trade name, and examples include: Novaclear (registered trademark) (manufactured by Mitsubishi Chemical Co., Ltd.) and Teijin A-PET Sheet (Teijin Chemical Co., Ltd.)制) etc. Regarding polypropylene resin films, they are represented by trade names, and include: FILMAX CPP film (manufactured by FILMAX), Sun Tox (registered trademark) (manufactured by Sun Tox Co., Ltd.), Tohcello (registered trademark) (Tohcello Co., Ltd.), Toyobo Pylen Film (registered trademark) (manufactured by Toyobo Co., Ltd.), Torayfan (registered trademark) (manufactured by Toray Advanced Film Co., Ltd.), Nihon Polyace (registered trademark), (Nihon Polyace Co., Ltd.) System), and Taige FC (registered Trademark) (manufactured by Futamura Chemical Co., Ltd.), etc. In addition, cellulose-based resin films are represented by trade names, and examples include Fujitac (registered trademark) TD (manufactured by Fuji Film Co., Ltd.), KC2UA and Konica Minolta TAC Film KC (Konica Minolta Co., Ltd.)制) etc.
本發明所使用之保護膜，可被賦予防眩性(霧度)，賦予防眩性之方法並無特別限定，例如可採用：在前述原料樹脂中混合無機微粒或有機微粒並進行膜化之方法；使用前述多層擠製，並由一方混合有微粒之樹脂與另一方未混合微粒之樹脂進行雙層膜化之方法；或是以混合有粒子之樹脂為外側並進行三層膜化之方法；以及將於硬化性黏合劑樹脂中混合有無機微粒或有機微粒而成之塗佈液塗佈於膜的單側，使黏合劑樹脂硬化而設置防眩層之方法等。 The protective film used in the present invention can be imparted with anti-glare properties (haze), and the method of imparting anti-glare properties is not particularly limited. For example, it can be formed by mixing inorganic particles or organic particles with the aforementioned raw material resin and forming a film. Method; using the aforementioned multi-layer extrusion, and a method of forming a two-layer film from one side of the resin mixed with particles and the other side of the resin without mixing particles; or a method of forming a three-layer film with the resin mixed with particles as the outside ; And the method of applying a coating solution made by mixing inorganic particles or organic particles into the curable adhesive resin on one side of the film, and hardening the adhesive resin to provide an anti-glare layer.
此外，保護膜，可視需要而含有添加劑。添加劑，例如可列舉出潤滑劑、抗結塊劑、熱穩定劑、抗氧化劑、抗靜電劑、耐光劑、耐衝擊改良劑等。 In addition, the protective film may contain additives as needed. Examples of the additives include lubricants, anti-blocking agents, heat stabilizers, antioxidants, antistatic agents, light resistance agents, and impact resistance modifiers.
保護膜的厚度，從強度和處理性等觀點來看，通常為1至50μm左右，較佳為10至40μm。 The thickness of the protective film is usually about 1 to 50 μm, preferably 10 to 40 μm from the viewpoints of strength and handling properties.
保護膜，在與偏光片之貼合前，較佳係預先施以皂化處理、電暈處理、或電漿處理等。 The protective film is preferably subjected to saponification treatment, corona treatment, or plasma treatment before being attached to the polarizer.
於第1保護膜，可更設置導電層、硬塗層、及低反射層等機能層。此外，構成前述防眩層之黏合劑樹脂，亦可選擇具有此等機能之樹脂組成物。 On the first protective film, functional layers such as conductive layer, hard coat layer, and low reflection layer can be further provided. In addition, the binder resin constituting the aforementioned anti-glare layer may also be a resin composition having these functions.
(亮度提升膜) (Brightness enhancement film)
背面側偏光板，於第2偏光片之遠離液晶單元之側配置有亮度提升膜。亮度提升膜的厚度較佳為35μm以下，尤佳為30μm以下。 The back side polarizing plate is provided with a brightness enhancement film on the side away from the liquid crystal cell of the second polarizer. The thickness of the brightness enhancement film is preferably 35 μm or less, particularly preferably 30 μm or less.
亮度提升膜，可使用具有將來自光源(背光)的射出光分離為穿透偏光與反射偏光或散射偏光之機能之偏光轉換元件。該亮度提升膜，可利用反射偏光或散射偏光之來自背光的回歸光，而提升直線偏光的射出效率。 The brightness enhancement film can use a polarization conversion element that has the function of separating the emitted light from the light source (backlight) into penetrating polarized light and reflected polarized light or scattered polarized light. The brightness enhancement film can utilize the reflected polarized light or scattered polarized light returning light from the backlight to improve the emission efficiency of linearly polarized light.
亮度提升膜，例如可列舉出異向性反射偏光片。異向性反射偏光片，可列舉出使一方之振動方向的直線偏光穿透，並使另一方之振動方向的直線偏光反射之異向性多重薄膜。異向性多重薄膜，例如可列舉出3M公司製的商品名稱“APF”、“DBEF”。此外，異向性反射偏光片，可列舉出膽固醇液晶層與λ/4板之複合體。該複合體，可列舉出日東電工股份有限公司製的商品名稱“PCF”。此外，異向性反射偏光片，可列舉出反射光柵偏光片。反射光柵偏光片，可列舉出：對金屬施以細微加工，即使於可見光區域，亦可射出反射偏光之金屬方格反射偏光片。當中，較佳是由異向性多重薄膜所構成之亮度提升膜。 As the brightness enhancement film, for example, an anisotropic reflective polarizer can be cited. The anisotropic reflective polarizer includes an anisotropic multiple film that transmits linearly polarized light in one vibration direction and reflects linearly polarized light in the other vibration direction. Examples of the anisotropic multiple film include "APF" and "DBEF" product names made by 3M. In addition, the anisotropic reflective polarizer includes a composite of a cholesteric liquid crystal layer and a λ/4 plate. As this complex, the product name "PCF" manufactured by Nitto Denko Co., Ltd. can be cited. In addition, the anisotropic reflective polarizer includes a reflective grating polarizer. Reflective grating polarizers can be listed as metal grid reflective polarizers that can be reflected and polarized even in the visible light region by applying fine processing to the metal. Among them, a brightness enhancement film composed of anisotropic multiple films is preferred.
於亮度提升膜之與偏光板之貼合面為相反側的面，可形成機能性層。機能性層，例如可列舉出硬塗層、防眩層、光擴散層、具有1/4波長的相位差值之相位差層等，藉此可提升與背光膠帶之密著性、或是提升顯示 圖像的均一性。 A functional layer can be formed on the surface of the brightness enhancement film on the opposite side to the bonding surface of the polarizing plate. The functional layer includes, for example, a hard coat layer, an anti-glare layer, a light diffusion layer, a retardation layer having a retardation value of 1/4 wavelength, etc., by which the adhesion to the backlight tape can be improved or improved display The uniformity of the image.
(表面保護膜) (Surface protection film)
分隔片，係在直到將觀看側偏光板及背面側偏光板貼合於液晶單元為止之期間，用以保護其表面而暫貼著之膜。分隔片通常由已對單面施以脫模處理之熱塑性樹脂膜所構成，該脫模處理面貼合於第1黏著劑層或第2黏著劑層。構成分隔片之熱塑性樹脂膜，例如可為如聚乙烯等聚乙烯系樹脂、如聚丙烯等聚丙烯系樹脂、如聚對苯二甲酸乙二酯或聚萘二甲酸乙二酯等聚酯系樹脂等。當設置預先設置在亮度提升膜上之第3黏著劑層時，對於第3黏著劑層的表面，為了在直到貼合第2偏光片為止之期間暫保護其表面，可預先貼著與上述相同之分隔片。分隔片的厚度，例如為10至50μm。 The separator is a film that is temporarily attached to protect the surface of the viewing-side polarizing plate and the back-side polarizing plate until the viewing-side polarizing plate and the back-side polarizing plate are attached to the liquid crystal cell. The separator is usually composed of a thermoplastic resin film that has been subjected to a mold release treatment on one side, and the mold release treatment surface is attached to the first adhesive layer or the second adhesive layer. The thermoplastic resin film constituting the separator can be, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, and a polyester resin such as polyethylene terephthalate or polyethylene naphthalate. Resin etc. When the third adhesive layer pre-installed on the brightness enhancement film is provided, the surface of the third adhesive layer can be pasted with the same as above in order to temporarily protect the surface of the third adhesive layer until the second polarizer is attached.之 Separator. The thickness of the separator is, for example, 10 to 50 μm.
防護膜，是由樹脂膜以及積層於該樹脂膜上之黏著劑層所構成。防護膜，係用以保護觀看側偏光板及背面側偏光板的表面之膜，例如可暫貼合於第1保護膜或亮度提升膜上。通常，例如在將附有防護膜之偏光板貼合於液晶單元後，連防護膜所具有之黏著劑層一起剝離去除。因此，防護膜所具有之黏著劑層，於本說明書中，未算入偏光板的厚度中。 The protective film is composed of a resin film and an adhesive layer laminated on the resin film. The protective film is a film used to protect the surfaces of the viewing-side polarizing plate and the back-side polarizing plate. For example, it can be temporarily attached to the first protective film or the brightness enhancement film. Usually, for example, after attaching a polarizing plate with a protective film to a liquid crystal cell, the adhesive layer of the protective film is peeled and removed together. Therefore, the adhesive layer of the protective film is not included in the thickness of the polarizing plate in this specification.
構成樹脂膜之樹脂，例如可為如聚乙烯等聚乙烯系樹脂、如聚丙烯等聚丙烯系樹脂、如聚對苯二甲酸乙二酯或聚萘二甲酸乙二酯等聚酯系樹脂、聚碳酸酯系樹脂等熱塑性樹脂。較佳為聚對苯二甲酸乙二酯等聚酯系 樹脂。樹脂膜，可為單層構造或多層構造，從製造容易性及製造成本等觀點來看，較佳為單層構造。關於防護膜所具有之黏著劑層，援引後述第1黏著劑層或第2黏著劑層中的說明。 The resin constituting the resin film may be, for example, polyethylene resins such as polyethylene, polypropylene resins such as polypropylene, polyester resins such as polyethylene terephthalate or polyethylene naphthalate, Thermoplastic resins such as polycarbonate resins. Preferably it is a polyester series such as polyethylene terephthalate Resin. The resin film may have a single-layer structure or a multilayer structure. From the viewpoints of ease of manufacture and manufacturing cost, a single-layer structure is preferred. Regarding the adhesive layer that the pellicle has, the description of the first adhesive layer or the second adhesive layer described later is cited.
(第1黏著劑層、第2黏著劑層) (1st adhesive layer, 2nd adhesive layer)
於偏光板的表面，可積層黏著劑層。可經由該黏著劑層將偏光板貼合於液晶單元。第1圖中，第1黏著劑層40及第2黏著劑層41相當於此。由黏著劑所形成之黏著劑層的厚度，較佳為5至25μm。更佳為10至25μm。
An adhesive layer can be laminated on the surface of the polarizing plate. The polarizing plate can be attached to the liquid crystal cell through the adhesive layer. In Fig. 1, the first
形成第1黏著劑層及第2黏著劑層之黏著劑，例如可適當地選擇並使用以丙烯酸系聚合物、聚矽氧系聚合物、聚酯、聚胺甲酸酯、聚醯胺、聚乙烯基醚、乙酸乙烯酯/氯乙烯共聚物、改質聚烯烴、環氧系、氟系、天然橡膠、合成橡膠等橡膠系等的聚合物作為基礎聚合物者。黏著劑，特佳為光學透明性優異，顯示出適度的潤濕性與凝聚性與接著性之黏著特性，且耐候性及耐熱性等優異者。 The adhesives forming the first adhesive layer and the second adhesive layer can be appropriately selected and used, for example, acrylic polymers, silicone polymers, polyesters, polyurethanes, polyamides, and polyamides. Vinyl ether, vinyl acetate/vinyl chloride copolymer, modified polyolefin, epoxy-based, fluorine-based, natural rubber, synthetic rubber, and other rubber-based polymers are used as the base polymer. The adhesive is particularly preferably one that has excellent optical transparency, shows moderate wettability, cohesiveness and adhesive properties, and is excellent in weather resistance and heat resistance.
黏著劑中，可調配其他各種添加劑。添加劑，可列舉出矽烷偶合劑、抗靜電劑。 Various other additives can be formulated in the adhesive. Examples of additives include silane coupling agents and antistatic agents.
第1黏著劑層及第2黏著劑層，其儲存彈性模數，於23至80℃時較佳為0.01至0.1MPa，尤佳為0.02至0.06MPa。所謂「於23至80℃時顯示0.01至0.1MPa的儲存彈性模數」，意指在此範圍的任一溫度中，儲存彈性模數皆為上述範圍之值。儲存彈性模數，通常隨著溫度上 升而逐漸減少，故若於23℃及80℃之儲存彈性模數皆位於上述範圍，則可視為在此範圍的溫度中，黏著劑層顯示出上述範圍的儲存彈性模數。黏著劑層的儲存彈性模數，可藉由市售的黏彈性測定裝置，例如REOMETRIC公司製的黏彈性測定裝置“DYNAMIC ANALYZER RDA II”來測定。 The storage elastic modulus of the first adhesive layer and the second adhesive layer is preferably 0.01 to 0.1 MPa, particularly preferably 0.02 to 0.06 MPa at 23 to 80°C. The so-called "showing a storage elastic modulus of 0.01 to 0.1 MPa at 23 to 80°C" means that at any temperature in this range, the storage elastic modulus is a value in the above range. The storage modulus of elasticity usually increases with temperature Therefore, if the storage elastic modulus at 23°C and 80°C are both in the above range, it can be regarded as the temperature in this range, the adhesive layer shows the storage elastic modulus in the above range. The storage elastic modulus of the adhesive layer can be measured by a commercially available viscoelasticity measuring device, for example, a viscoelasticity measuring device "DYNAMIC ANALYZER RDA II" manufactured by REOMETRIC.
(偏光板的製造方法) (Method of manufacturing polarizing plate)
說明構成本發明之偏光板之觀看側偏光板及背面側偏光板的製造方法。上述所說明之構件，例如可經由接著劑層或黏著劑層來積層而相互貼合。 The manufacturing method of the viewing side polarizing plate and the back side polarizing plate constituting the polarizing plate of the present invention will be described. The members described above can be laminated and bonded to each other via an adhesive layer or an adhesive layer, for example.
(偏光片與保護膜之積層) (Layer of polarizer and protective film)
保護膜與偏光片之積層，例如，較佳可藉由使用接著劑使其一體化之方法來進行。由接著劑所形成之接著層的厚度，較佳為0.01至35μm，尤佳為0.01至10μm，更佳為0.01至5μm。若位於此範圍，則於保護膜與偏光片之間不會產生浮起或剝離，可得到實用上無問題之接著力。 The lamination of the protective film and the polarizer, for example, is preferably performed by a method of integrating them with an adhesive. The thickness of the adhesive layer formed by the adhesive is preferably 0.01 to 35 μm, particularly preferably 0.01 to 10 μm, and more preferably 0.01 to 5 μm. If it is in this range, floating or peeling will not occur between the protective film and the polarizer, and practically no problem adhesive force can be obtained.
接著劑，例如有溶劑型接著劑、乳化型接著劑、感壓性接著劑、再濕潤性接著劑、聚縮合型接著劑、無溶劑型接著劑、膜狀接著劑、以及熱熔型接著劑等。此外，可視需要隔著定錨塗佈層來設置接著層。 Adhesives, such as solvent-based adhesives, emulsified adhesives, pressure-sensitive adhesives, re-wetting adhesives, polycondensation-type adhesives, solvent-free adhesives, film-like adhesives, and hot-melt adhesives Wait. In addition, an adhesive layer may be provided via the anchor coating layer as needed.
較佳的接著劑，可列舉出水溶性接著劑。此水溶性接著劑，例如有以聚乙烯醇系樹脂為主成分者。水溶性接著劑可使用市售品，亦可使用將溶劑或添加劑混合於市售的接著劑者。就可成為水溶性接著劑之市售的聚乙烯醇系樹脂而言，例如有Kuraray股份有限公司製的 KL-318等。 Preferred adhesives include water-soluble adhesives. This water-soluble adhesive includes, for example, a polyvinyl alcohol-based resin as a main component. A commercially available product may be used for the water-soluble adhesive, and a solvent or an additive may be mixed with a commercially available adhesive. As for commercially available polyvinyl alcohol resins that can be used as water-soluble adhesives, for example, those made by Kuraray Co., Ltd. KL-318 and so on.
水溶性接著劑，可含有交聯劑。交聯劑的種類，較佳為胺化合物、醛化合物、羥甲基化合物、環氧化合物、異氰酸酯化合物、及多價金屬鹽等，特佳為環氧化合物。交聯劑的市售品，例如有乙二醛(Glyoxal)、田岡化學工業股份有限公司製的Sumirez Resin 650(30)等。 The water-soluble adhesive may contain a crosslinking agent. The type of crosslinking agent is preferably an amine compound, an aldehyde compound, a methylol compound, an epoxy compound, an isocyanate compound, a polyvalent metal salt, etc., and an epoxy compound is particularly preferable. Commercial products of the crosslinking agent include, for example, glyoxal (Glyoxal), Sumirez Resin 650 (30) manufactured by Taoka Chemical Industry Co., Ltd., and the like.
此外，另一種較佳的接著劑，可列舉出由藉由活性能量射線的照射而硬化之樹脂組成物所構成之活性能量射線硬化型接著劑。活性能量射線硬化型接著劑層，可列舉出：含有聚合性化合物及光聚合起始劑者、含有光反應性樹脂者、含有黏合劑樹脂及光反應***聯劑者等。聚合性化合物，可列舉出：光硬化性環氧系單體、光硬化性丙烯酸系單體、光硬化性胺甲酸酯系單體等光聚合性單體，或是來自光聚合性單體之低聚物。光聚合起始劑，可列舉出：含有藉由如紫外線等活性能量射線的照射而產生自由基、陽離子、或陰離子等活性物種之物質者。含有聚合性化合物及光聚合起始劑之活性能量射線硬化型接著劑，可較佳地使用含有光硬化性環氧系單體及光陽離子聚合起始劑者。 In addition, another preferable adhesive includes an active energy ray-curable adhesive composed of a resin composition that is cured by irradiation of active energy rays. Examples of the active energy ray-curable adhesive layer include those containing a polymerizable compound and a photopolymerization initiator, those containing a photoreactive resin, and those containing a binder resin and a photoreactive crosslinking agent. The polymerizable compound may include photopolymerizable monomers such as photocurable epoxy monomers, photocurable acrylic monomers, and photocurable urethane monomers, or are derived from photopolymerizable monomers The oligomer. Examples of the photopolymerization initiator include those containing substances that generate active species such as radicals, cations, or anions by irradiation with active energy rays such as ultraviolet rays. For the active energy ray-curable adhesive containing a polymerizable compound and a photopolymerization initiator, those containing a photocurable epoxy-based monomer and a photocationic polymerization initiator can be preferably used.
使用活性能量射線硬化型接著劑時，於貼合偏光片與保護膜後，可視需要進行乾燥步驟，然後進行照射活性能量射線而使活性能量射線硬化型接著劑硬化之硬化步驟。活性能量射線的光源並無特別限定，較佳為在波長400nm以下具有發光分布之紫外線，具體而言，可使 用低壓汞燈、中壓汞燈、高壓汞燈、超高壓汞燈、捕蟲器用螢光燈、黑光燈、微波激發汞燈、金屬鹵化物燈等。 When using an active energy ray-curable adhesive, after bonding the polarizer and the protective film, a drying step may be performed as necessary, and then a curing step of irradiating the active energy ray to harden the active energy ray-curing adhesive is performed. The light source of the active energy ray is not particularly limited. It is preferably ultraviolet light having a luminescence distribution at a wavelength of 400 nm or less. Specifically, it can be used Use low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, fluorescent lamps for insect traps, black light lamps, microwave-excited mercury lamps, metal halide lamps, etc.
上述接著劑，可含有添加劑。添加劑，可列舉出離子捕集劑、抗氧化劑、鏈轉移劑、增感劑、黏著賦予劑、熱塑性樹脂、填充劑、流動調整劑、塑化劑、消泡劑等。 The above-mentioned adhesive may contain additives. Examples of additives include ion trapping agents, antioxidants, chain transfer agents, sensitizers, tackifiers, thermoplastic resins, fillers, flow regulators, plasticizers, defoamers, and the like.
(偏光片與亮度提升膜之積層) (Layer of polarizer and brightness enhancement film)
於偏光片與亮度提升膜之貼合時，較佳係使用黏著劑層。第1圖中，第3黏著劑層相當於此。由黏著劑所形成之黏著劑層的厚度，較佳為3至20μm。更佳為3至10μm。 When bonding the polarizer and the brightness enhancement film, it is preferable to use an adhesive layer. In Figure 1, the third adhesive layer corresponds to this. The thickness of the adhesive layer formed by the adhesive is preferably 3 to 20 μm. More preferably, it is 3 to 10 μm.
貼合偏光片與亮度提升膜之黏著劑層，例如可適當地選擇並使用以丙烯酸系聚合物、聚矽氧系聚合物、聚酯、聚胺甲酸酯、聚醯胺、聚乙烯基醚、乙酸乙烯酯/氯乙烯共聚物、改質聚烯烴、環氧系、氟系、天然橡膠、合成橡膠等橡膠系等的聚合物作為基礎聚合物者。黏著劑，特佳為光學透明性優異，顯示出適度的潤濕性與凝聚性與接著性之黏著特性，且耐候性及耐熱性等優異者。 The adhesive layer for bonding the polarizer and the brightness enhancement film, for example, acrylic polymer, silicone polymer, polyester, polyurethane, polyamide, polyvinyl ether can be appropriately selected and used , Vinyl acetate/vinyl chloride copolymer, modified polyolefin, epoxy-based, fluorine-based, natural rubber, synthetic rubber and other rubber-based polymers as the base polymer. The adhesive is particularly preferably one that has excellent optical transparency, shows moderate wettability, cohesiveness and adhesive properties, and is excellent in weather resistance and heat resistance.
黏著劑中，可調配其他各種添加劑。添加劑，可列舉出矽烷偶合劑、抗靜電劑。 Various other additives can be formulated in the adhesive. Examples of additives include silane coupling agents and antistatic agents.
第3黏著劑層，其儲存彈性模數，於23至80℃時較佳為0.10至1.0MPa，尤佳為0.15至0.8MPa。於23至80℃之儲存彈性模數為0.10至1.0MPa時，可緩和濕熱環境下之偏光片的收縮力，可更有效地減少液晶面板的 翹曲。就將第3黏著劑層的儲存彈性模數設為0.10至1.0MPa之方法而言，將胺甲酸酯丙烯酸酯系低聚物調配於通常的黏著劑組成物者為有效。較佳係在調配如此的胺甲酸酯丙烯酸酯系低聚物，並且照射能量射線使其硬化者，會顯示高儲存彈性模數。 The storage elastic modulus of the third adhesive layer is preferably 0.10 to 1.0 MPa, particularly preferably 0.15 to 0.8 MPa at 23 to 80°C. When the storage elastic modulus at 23 to 80℃ is 0.10 to 1.0MPa, it can alleviate the shrinkage force of the polarizer in a humid and hot environment, and can more effectively reduce the liquid crystal panel Warped. Regarding the method of setting the storage elastic modulus of the third adhesive layer to 0.10 to 1.0 MPa, it is effective to mix the urethane acrylate-based oligomer with a normal adhesive composition. It is preferable to prepare such a urethane acrylate oligomer and irradiate it with energy rays to harden it, and it will show a high storage elastic modulus.
本發明之偏光板的形狀並無特別限定，可為矩形。當以卷至卷方式來製造偏光板時，可裁切為既定形狀。本發明之偏光板，可為對角線15吋以下之矩形形狀，可為對角線3吋以上之矩形形狀，亦可為對角線7吋以上之矩形形狀。 The shape of the polarizing plate of the present invention is not particularly limited, and may be rectangular. When the polarizing plate is manufactured in a roll-to-roll method, it can be cut into a predetermined shape. The polarizing plate of the present invention can be a rectangular shape with a diagonal of 15 inches or less, a rectangular shape with a diagonal of 3 inches or more, or a rectangular shape with a diagonal of 7 inches or more.
(液晶面板的製造方法) (Method of manufacturing liquid crystal panel)
藉由將本發明之偏光板之套組分別貼合於液晶單元的雙面，可得到液晶面板。貼合，較佳係經由觀看側偏光板的第1黏著劑層，以及經由背面側偏光板的第2黏著劑層而分別進行。本發明之液晶面板，可較佳地應用在液晶顯示裝置。觀看側偏光板，較佳係以其吸收軸與液晶單元的短邊方向大致平行之方式來貼合，背面側偏光板，較佳係以其吸收軸與液晶單元的長邊方向大致平行之方式來貼合。本說明書中，所謂大致平行，係表示例如所形成之角度為0±5°，較佳為0±1°。 By attaching the polarizing plate set of the present invention to both sides of the liquid crystal cell respectively, a liquid crystal panel can be obtained. The bonding is preferably performed separately through the first adhesive layer of the viewing side polarizing plate and the second adhesive layer of the back side polarizing plate. The liquid crystal panel of the present invention can be preferably applied to liquid crystal display devices. The viewing side polarizing plate is preferably attached so that its absorption axis is approximately parallel to the short side direction of the liquid crystal cell, and the back side polarizing plate is preferably attached so that its absorption axis is approximately parallel to the long side direction of the liquid crystal cell. To fit. In this specification, the term “substantially parallel” means that, for example, the angle formed is 0±5°, preferably 0±1°.
從可控制水分於觀看側偏光板及背面側偏光板之進出，且更提高本發明之效果來看，液晶面板的製造，較佳例如在溫度18至28℃、相對濕度40至70%的環境下進行。 From the perspective of controlling the entry and exit of moisture on the viewing side polarizing plate and the back side polarizing plate, and further improving the effect of the present invention, the manufacturing of liquid crystal panels is preferably in an environment with a temperature of 18 to 28°C and a relative humidity of 40 to 70%. Proceed under.
液晶單元，係具有2片單元基板與被夾持於此等基板間之液晶層。單元基板，一般大多是由玻璃所構成，亦可為塑膠基板。其他，本發明之液晶面板所使用之液晶單元本身，可由該領域所採用之各種者來構成。根據本發明之偏光板之套組，即使該液晶單元的厚度為0.4mm以下，亦可顯著地減少翹曲。本發明中，液晶單元的厚度，包含液晶層、與夾持液晶層之一對基板之厚度。 The liquid crystal cell has two cell substrates and a liquid crystal layer sandwiched between these substrates. The unit substrate is generally composed of glass, but it can also be a plastic substrate. In addition, the liquid crystal cell itself used in the liquid crystal panel of the present invention can be constituted by various ones used in this field. According to the polarizing plate set of the present invention, even if the thickness of the liquid crystal cell is 0.4 mm or less, the warpage can be significantly reduced. In the present invention, the thickness of the liquid crystal cell includes the thickness of the liquid crystal layer and a pair of substrates sandwiching the liquid crystal layer.
以下係藉由實施例來更詳細說明本發明，但本發明並不限定於此等例。例中，表示含量及使用量之%及份，在無特別記載時為重量基準。再者，實施例中所使用之評估方法如下所述。 The following examples illustrate the present invention in more detail, but the present invention is not limited to these examples. In the examples, the content and usage amount are expressed in% and parts, and unless otherwise stated, they are based on weight. Furthermore, the evaluation methods used in the examples are as follows.
(1)厚度：使用Nikon股份有限公司製的Digital Micrometer MH-15M來測定。 (1) Thickness: Measured using Digital Micrometer MH-15M manufactured by Nikon Co., Ltd.
(2)面內阻滯值Re及厚度方向阻滯值Rth：使用以平行偏光旋轉法為原理之相位差計，王子計測機器股份有限公司製的KOBRA-WPR，以於23℃中波長590nm的光進行測定。 (2) In-plane retardation value Re and thickness direction retardation value Rth: using a phase difference meter based on the principle of the parallel polarization rotation method, KOBRA-WPR manufactured by Oji Measuring Instruments Co., Ltd., with a wavelength of 590nm at 23°C Light is measured.
(3)儲存彈性模數：黏著劑的儲存彈性模數(G’)，係製作由測定對象的黏著劑所構成之直徑8mm×厚度1mm的圓柱狀試驗片，使用動態黏彈性測定裝置(Dynamic Analyzer RDA II：REOMETRIC股份有限公司製)，藉由頻率1Hz的扭轉剪切 法，將初期應變設為1N，並在溫度23℃或溫度80℃的條件下進行測定。 (3) Storage modulus of elasticity: The storage modulus of elasticity (G') of the adhesive is to make a cylindrical test piece with a diameter of 8 mm × a thickness of 1 mm composed of the adhesive of the measuring object, and use a dynamic viscoelasticity measuring device (Dynamic Analyzer RDA II: manufactured by REOMETRIC Co., Ltd.), with torsional shear at a frequency of 1 Hz Method, the initial strain is set to 1N, and the measurement is performed under the conditions of a temperature of 23°C or a temperature of 80°C.
如以下所述般地製備各構件。 Each member was prepared as described below.
(偏光片A) (Polarizer A)
藉由乾式延伸，將厚度30μm的聚乙烯醇膜(平均聚合度約2400、皂化度99.9莫耳%以上)單軸延伸至約5倍，然後保持緊繃狀態，於60℃的純水浸漬1分鐘後，於28℃浸漬在碘/碘化鉀/水的重量比為0.05/5/100的水溶液中60秒。然後，於72℃浸漬在碘化鉀/硼酸/水的重量比為8.5/8.5/100的水溶液中300秒。繼而，以26℃的純水洗淨20秒後，於65℃進行乾燥，而得到於聚乙烯醇膜吸附配向有碘之厚度12μm的偏光片。 By dry stretching, a polyvinyl alcohol film with a thickness of 30μm (average degree of polymerization of about 2400, saponification degree of 99.9 mol% or more) is uniaxially stretched to about 5 times, and then kept tight, immersed in pure water at 60°C1 Minutes later, it was immersed in an aqueous solution with a weight ratio of iodine/potassium iodide/water of 0.05/5/100 at 28°C for 60 seconds. Then, it was immersed in an aqueous solution having a weight ratio of potassium iodide/boric acid/water of 8.5/8.5/100 at 72°C for 300 seconds. Then, after washing with pure water at 26° C. for 20 seconds, it was dried at 65° C. to obtain a 12 μm-thick polarizer with iodine adsorbed and aligned on the polyvinyl alcohol film.
(偏光片B) (Polarizer B)
藉由乾式延伸，將厚度20μm的聚乙烯醇膜(平均聚合度約2400、皂化度99.9莫耳%以上)單軸延伸至約5倍，然後保持緊繃狀態，於60℃的純水浸漬1分鐘後，於28℃浸漬在碘/碘化鉀/水的重量比為0.05/5/100的水溶液中60秒。然後，於72℃浸漬在碘化鉀/硼酸/水的重量比為8.5/8.5/100的水溶液中300秒。繼而，以26℃的純水洗淨20秒後，於65℃進行乾燥，而得到於聚乙烯醇膜吸附配向有碘之厚度7μm的偏光片。 By dry stretching, a polyvinyl alcohol film with a thickness of 20 μm (average degree of polymerization of about 2400, saponification degree of 99.9 mol% or more) is uniaxially stretched to about 5 times, and then kept tight, immersed in pure water at 60°C1 Minutes later, it was immersed in an aqueous solution with a weight ratio of iodine/potassium iodide/water of 0.05/5/100 at 28°C for 60 seconds. Then, it was immersed in an aqueous solution having a weight ratio of potassium iodide/boric acid/water of 8.5/8.5/100 at 72°C for 300 seconds. Then, after washing with pure water at 26° C. for 20 seconds, it was dried at 65° C. to obtain a 7 μm-thick polarizer with iodine adsorbed and aligned on the polyvinyl alcohol film.
(偏光片C) (Polarizer C)
藉由乾式延伸，將厚度20μm的聚乙烯醇膜(平均聚合度約2400、皂化度99.9莫耳%以上)單軸延伸至約4.9倍， 然後保持緊繃狀態，於60℃的純水浸漬1分鐘後，於28℃浸漬在碘/碘化鉀/水的重量比為0.05/5/100的水溶液中60秒。然後，於72℃浸漬在碘化鉀/硼酸/水的重量比為8.5/8.5/100的水溶液中300秒。繼而，以26℃的純水洗淨20秒後，於65℃進行乾燥，而得到於聚乙烯醇膜吸附配向有碘之厚度8μm的偏光片。 By dry stretching, a polyvinyl alcohol film with a thickness of 20 μm (average degree of polymerization of about 2400, saponification degree of 99.9 mol% or more) is uniaxially stretched to about 4.9 times. Then, maintaining a tight state, immersed in pure water at 60°C for 1 minute, and then immersed in an aqueous solution with a weight ratio of iodine/potassium iodide/water of 0.05/5/100 at 28°C for 60 seconds. Then, it was immersed in an aqueous solution having a weight ratio of potassium iodide/boric acid/water of 8.5/8.5/100 at 72°C for 300 seconds. Then, after washing with pure water at 26°C for 20 seconds, it was dried at 65°C to obtain a polarizer with a thickness of 8 μm in which iodine was adsorbed and aligned on a polyvinyl alcohol film.
(黏著劑層A) (Adhesive layer A)
使用：於已施以脫模處理之厚度38μm的聚對苯二甲酸乙二酯膜(分隔片)的脫模處理面積層有厚度20μm的丙烯酸系黏著劑層之市售的黏著劑薄片。丙烯酸系黏著劑中，並未調配胺甲酸酯丙烯酸酯低聚物。從黏著劑薄片移除剝離膜後之黏著劑層的儲存彈性模數，於23℃時為0.05MPa，於80℃時為0.04MPa。 Use: A commercially available adhesive sheet having an acrylic adhesive layer with a thickness of 20 μm in the release treatment area layer of a 38 μm thick polyethylene terephthalate film (separator) that has been subjected to a release treatment. In the acrylic adhesive, urethane acrylate oligomer is not formulated. The storage elastic modulus of the adhesive layer after the release film is removed from the adhesive sheet is 0.05 MPa at 23°C and 0.04 MPa at 80°C.
(黏著劑層B) (Adhesive layer B)
使用：於已施以脫模處理之厚度38μm的聚對苯二甲酸乙二酯膜(分隔片)的脫模處理面積層有厚度15μm的丙烯酸系黏著劑層之市售的黏著劑薄片。丙烯酸系黏著劑中，並未調配胺甲酸酯丙烯酸酯低聚物。從黏著劑薄片移除剝離膜後之黏著劑層的儲存彈性模數，於23℃時為0.05MPa，於80℃時為0.04MPa。 Use: A commercially available adhesive sheet having an acrylic adhesive layer with a thickness of 15 μm in the release treatment area layer of a 38 μm thick polyethylene terephthalate film (separator) that has been subjected to a release treatment. In the acrylic adhesive, urethane acrylate oligomer is not formulated. The storage elastic modulus of the adhesive layer after the release film is removed from the adhesive sheet is 0.05 MPa at 23°C and 0.04 MPa at 80°C.
(黏著劑層C) (Adhesive layer C)
將於丙烯酸丁酯與丙烯酸之共聚物中添加有胺甲酸酯丙烯酸酯低聚物及異氰酸酯系交聯劑之有機溶劑溶液，藉由模具塗佈機，以使乾燥後的厚度成為5μm之方式塗佈 於已施以脫模處理之厚度38μm的聚對苯二甲酸乙二酯膜(分隔片)的脫模處理面並進行乾燥，而得到積層有黏著劑層之黏著劑薄片。從黏著劑薄片移除剝離膜後之黏著劑層的儲存彈性模數，於23℃時為0.40MPa，於80℃時為0.18MPa。 Add an organic solvent solution of urethane acrylate oligomer and isocyanate-based crosslinking agent to the copolymer of butyl acrylate and acrylic acid, and use a die coater to make the thickness after drying 5μm Coating The release process was applied to the release process surface of a 38 μm thick polyethylene terephthalate film (separator sheet) and dried to obtain an adhesive sheet laminated with an adhesive layer. The storage elastic modulus of the adhesive layer after the release film was removed from the adhesive sheet was 0.40 MPa at 23°C and 0.18 MPa at 80°C.
(保護膜) (Protective film)
製備以下的保護膜。 Prepare the following protective film.
保護膜A：厚度20μm的三乙酸纖維素膜(Konica Minolta股份有限公司製)。在波長590nm之面內相位差值=1.2nm、在波長590nm之厚度方向相位差值=1.3nm。 Protective film A: A cellulose triacetate film (manufactured by Konica Minolta Co., Ltd.) with a thickness of 20 μm. The in-plane retardation value at a wavelength of 590 nm = 1.2 nm, and the thickness direction retardation value at a wavelength of 590 nm = 1.3 nm.
保護膜B：厚度13μm的環烯烴系樹脂膜(Zeon Japan股份有限公司製)。在波長590nm之面內相位差值=0.8nm、在波長590nm之厚度方向相位差值=3.4nm、在波長483nm之厚度方向相位差值=3.5nm、在波長755nm之厚度方向相位差值=2.8nm。 Protective film B: Cycloolefin resin film (manufactured by Zeon Japan Co., Ltd.) with a thickness of 13 μm. In-plane retardation value at a wavelength of 590nm=0.8nm, retardation value in the thickness direction at a wavelength of 590nm=3.4nm, retardation value in the thickness direction at a wavelength of 483nm=3.5nm, retardation value in the thickness direction at a wavelength of 755nm=2.8 nm.
保護膜C：厚度23μm的環烯烴系樹脂膜(Zeon Japan股份有限公司製)。 Protective film C: Cycloolefin resin film (manufactured by Zeon Japan Co., Ltd.) with a thickness of 23 μm.
保護膜D：厚度32μm之表面經硬塗處理的三乙酸纖維素膜(Toppan TOMOEGAWA Optical Film股份有限公司製、25KCHC-TC)。透濕度為400g/(m2‧24hr)。 Protective film D: A cellulose triacetate film (manufactured by Toppan TOMOEGAWA Optical Film Co., Ltd., 25KCHC-TC) whose surface is hard-coated with a thickness of 32 μm. The moisture permeability is 400g/(m 2 ‧24hr).
(亮度提升膜) (Brightness enhancement film)
使用厚度26μm的亮度提升膜(3M公司製、商品名稱ADvanceD PolarizeD Film,Version 3)。 A brightness enhancement film with a thickness of 26 μm (manufactured by 3M, brand name ADvanceD PolarizeD Film, Version 3) was used.
(水系接著劑) (Water-based adhesive)
將3份之羧基改質聚乙烯醇(Kuraray股份有限公司製的KL-318)溶解於水100份，於其水溶液中添加1.5份之屬於水溶性環氧化合物的聚醯胺環氧系添加劑(Sumika Chemtex股份有限公司製的Sumirez Resin(註冊商標)650(30)、固體成分濃度30%的水溶液)，作為水系接著劑。 Dissolve 3 parts of carboxyl modified polyvinyl alcohol (KL-318 manufactured by Kuraray Co., Ltd.) in 100 parts of water, and add 1.5 parts of polyamide epoxy additives which are water-soluble epoxy compounds to the aqueous solution ( Sumirez Resin (registered trademark) 650 (30), an aqueous solution with a solid content concentration of 30%) manufactured by Sumika Chemtex Co., Ltd. was used as an aqueous adhesive.
(製造例1：觀看側偏光板A) (Manufacturing example 1: Viewing side polarizing plate A)
經由水系接著劑將保護膜B貼合於偏光片A的單面。經由水系接著劑將保護膜D貼合於前述偏光片A之另一面。將積層於剝離膜上之黏著劑層A，貼合於前述保護膜B之與偏光片A之貼合面為相反側的面。觀看側偏光板A的厚度為77μm。 The protective film B is bonded to one side of the polarizer A via an aqueous adhesive. The protective film D is attached to the other side of the aforementioned polarizer A via an aqueous adhesive. The adhesive layer A laminated on the release film is bonded to the surface of the protective film B on the opposite side to the bonding surface of the polarizer A. The thickness of the viewing side polarizing plate A is 77 μm.
(製造例2：觀看側偏光板B) (Manufacturing example 2: Viewing side polarizing plate B)
經由水系接著劑將保護膜C貼合於偏光片A的單面。經由水系接著劑將保護膜D貼合於前述偏光片A之另一面。將積層於剝離膜上之黏著劑層A，貼合於前述保護膜C之與偏光片A之貼合面為相反側的面。觀看側偏光板B的厚度為87μm。 The protective film C is bonded to one side of the polarizer A via an aqueous adhesive. The protective film D is attached to the other side of the aforementioned polarizer A via an aqueous adhesive. The adhesive layer A laminated on the release film is bonded to the surface of the protective film C on the opposite side to the bonding surface of the polarizer A. The thickness of the viewing side polarizing plate B is 87 μm.
(製造例3：觀看側偏光板C) (Manufacturing example 3: Viewing side polarizing plate C)
經由水系接著劑將保護膜A貼合於偏光片B的單面。經由水系接著劑將保護膜D貼合於前述偏光片B之另一面。將積層於剝離膜上之黏著劑層A，貼合於前述保護膜A之與偏光片B之貼合面為相反側的面。觀看側偏光板C的厚度為79μm。 The protective film A was bonded to one side of the polarizer B via an aqueous adhesive. The protective film D is attached to the other side of the aforementioned polarizer B via an aqueous adhesive. The adhesive layer A laminated on the release film is bonded to the surface of the protective film A on the opposite side to the bonding surface of the polarizer B. The thickness of the viewing side polarizing plate C is 79 μm.
(製造例4：背面側偏光板A) (Manufacturing example 4: Back side polarizing plate A)
經由水系接著劑將保護膜B貼合於偏光片B的單面。將積層於剝離膜上之黏著劑層C，貼合於前述偏光片B之與保護膜B之貼合面為相反側的面。將積層於剝離膜上之黏著劑層B，貼合於前述保護膜B之與偏光片B之貼合面為相反側的面。將前述黏著劑層C上的剝離膜剝離，並於此貼合亮度提升膜。背面側偏光板A的厚度為66μm。 The protective film B is bonded to one side of the polarizer B via an aqueous adhesive. The adhesive layer C laminated on the release film is bonded to the surface of the polarizer B on the opposite side to the bonding surface of the protective film B. The adhesive layer B laminated on the release film is bonded to the surface of the protective film B on the opposite side to the bonding surface of the polarizer B. The peeling film on the aforementioned adhesive layer C was peeled off, and the brightness enhancement film was attached thereto. The thickness of the back side polarizing plate A was 66 μm.
(製造例5：背面側偏光板B) (Manufacturing Example 5: Back side polarizing plate B)
經由水系接著劑將保護膜A貼合於偏光片B的單面。將積層於剝離膜上之黏著劑層C，貼合於前述偏光片B之與保護膜A之貼合面為相反側的面。將積層於剝離膜上之黏著劑層A，貼合於前述保護膜A之與偏光片B之貼合面為相反側的面。將前述黏著劑層C上的剝離膜剝離，並於此貼合亮度提升膜。背面側偏光板B的厚度為78μm。 The protective film A was bonded to one side of the polarizer B via an aqueous adhesive. The adhesive layer C laminated on the release film is bonded to the surface of the polarizer B on the opposite side to the bonding surface of the protective film A. The adhesive layer A laminated on the release film is bonded to the surface of the protective film A on the opposite side to the bonding surface of the polarizer B. The peeling film on the aforementioned adhesive layer C was peeled off, and the brightness enhancement film was attached thereto. The thickness of the back-side polarizing plate B is 78 μm.
(製造例6：背面側偏光板C) (Manufacturing Example 6: Back side polarizing plate C)
經由水系接著劑將保護膜A貼合於偏光片B的單面。將積層於剝離膜上之黏著劑層C，貼合於前述偏光片B之與保護膜A之貼合面為相反側的面。將積層於剝離膜上之黏著劑層B，貼合於前述保護膜A之與偏光片B之貼合面為相反側的面。將前述黏著劑層C上的剝離膜剝離，並於此貼合亮度提升膜。背面側偏光板C的厚度為73μm。 The protective film A was bonded to one side of the polarizer B via an aqueous adhesive. The adhesive layer C laminated on the release film is bonded to the surface of the polarizer B on the opposite side to the bonding surface of the protective film A. The adhesive layer B laminated on the release film is bonded to the surface of the protective film A on the opposite side to the bonding surface of the polarizer B. The peeling film on the aforementioned adhesive layer C was peeled off, and the brightness enhancement film was attached thereto. The thickness of the back-side polarizing plate C is 73 μm.
(製造例7：觀看側偏光板D) (Manufacturing example 7: viewing side polarizing plate D)
使用偏光片C來取代偏光片A，除此之外，其他與製造例1相同方式而製作觀看側偏光板D。觀看側偏光板D的厚度為73μm。 The polarizer C was used instead of the polarizer A, and otherwise the viewing-side polarizer D was produced in the same manner as in Production Example 1. The thickness of the viewing side polarizing plate D is 73 μm.
(製造例8：觀看側偏光板E) (Manufacturing example 8: viewing side polarizing plate E)
使用偏光片C來取代偏光片A，除此之外，其他與製造例2相同方式而製作觀看側偏光板E。觀看側偏光板E的厚度為83μm。 Except that the polarizer C was used instead of the polarizer A, the viewing-side polarizer E was produced in the same manner as in Production Example 2 except that the polarizer C was used. The thickness of the viewing side polarizing plate E is 83 μm.
(製造例9：背面側偏光板D) (Manufacturing Example 9: Back side polarizing plate D)
使用偏光片C來取代偏光片B，除此之外，其他與製造例4相同方式而製作背面側偏光板D。背面側偏光板D的厚度為67μm。 Except that the polarizer C was used instead of the polarizer B, the back side polarizing plate D was produced in the same manner as in Production Example 4 in other respects. The thickness of the back-side polarizing plate D is 67 μm.
(製造例10：背面側偏光板E) (Manufacturing Example 10: Back side polarizing plate E)
使用偏光片C來取代偏光片B，除此之外，其他與製造例5相同方式而製作背面側偏光板E。背面側偏光板E的厚度為79μm。 The polarizer C was used instead of the polarizer B, and otherwise, the back side polarizer E was produced in the same manner as in Production Example 5. The thickness of the back-side polarizing plate E was 79 μm.
(製造例11：背面側偏光板F) (Production Example 11: Back side polarizing plate F)
使用偏光片C來取代偏光片B，除此之外，其他與製造例6相同方式而製作背面側偏光板F。背面側偏光板F的厚度為74μm。 The polarizer C was used instead of the polarizer B, and otherwise the back side polarizing plate F was produced in the same manner as in Production Example 6. The thickness of the back-side polarizing plate F is 74 μm.
(實施例1) (Example 1)
將觀看側偏光板A及背面側偏光板A裁切為長邊方向155.25mm、短邊方向95.9mm之矩形形狀。再者，關於觀看側偏光板，係以使其吸收軸與短邊方向平行之方式來裁切，關於背面側偏光板，係以使其吸收軸與長邊方向平行之方式來裁切。 The viewing side polarizing plate A and the back side polarizing plate A are cut into a rectangular shape of 155.25 mm in the long side direction and 95.9 mm in the short side direction. In addition, the viewing-side polarizing plate is cut so that its absorption axis is parallel to the short-side direction, and the back-side polarizing plate is cut so that its absorption axis is parallel to the long-side direction.
(在常溫環境下之面板的翹曲) (Warpage of the panel under normal temperature environment)
從經裁切之觀看側偏光板A，將黏著劑層A上的剝離 膜剝離，並經由該黏著劑層A貼合於厚度0.2mm的無鹼玻璃(相當於液晶單元基板，為長邊方向160mm、短邊方向102mm之矩形)之一面。從經裁切之背面側偏光板A，將黏著劑層B上的剝離膜剝離，並經由該黏著劑層B貼合於前述無鹼玻璃之另一面。如此，得到由觀看側偏光板A/玻璃板/背面側偏光板A所構成之積層體。然後對此積層體進行高壓釜處理。各偏光板的吸收軸呈正交。再者，於任一實施例中，觀看側偏光板的水分率皆為1.13%，背面側偏光板的水分率皆為0.6%，兩者的差為0.53%。 View the side polarizer A from the cut and peel off the adhesive layer A The film was peeled off, and was bonded to one surface of an alkali-free glass (corresponding to a liquid crystal cell substrate, 160 mm in the long-side direction and 102 mm in the short-side direction) with a thickness of 0.2 mm via the adhesive layer A. From the cut back side polarizing plate A, the release film on the adhesive layer B is peeled, and the adhesive layer B is bonded to the other side of the aforementioned alkali-free glass. In this way, a laminate composed of viewing side polarizing plate A/glass plate/back side polarizing plate A was obtained. Then the laminate is subjected to autoclave treatment. The absorption axis of each polarizer is orthogonal. Furthermore, in any embodiment, the moisture content of the viewing side polarizing plate is 1.13%, and the moisture content of the back side polarizing plate is 0.6%, and the difference between the two is 0.53%.
將上述積層體，於溫度23℃、濕度55%RH的環境下靜置24小時。然後以觀看側偏光板A為上側之方式，將積層體放置在二維測定器(Nikon股份有限公司製、NEXIV(註冊商標)VMZ-R4540)的測定台上。 The above-mentioned laminate was allowed to stand for 24 hours in an environment with a temperature of 23° C. and a humidity of 55% RH. Then, with the viewing side polarizing plate A on the upper side, the laminated body was placed on the measurement table of a two-dimensional measuring device (manufactured by Nikon Co., Ltd., NEXIV (registered trademark) VMZ-R4540).
繼而，將焦點對焦於測定台的表面，以此為基準，將焦點分別對焦於積層體之面上的25點，並測定自作為基準的焦點起之高度。將25點的測定點之高度的最大值與最小值之差設為翹曲量。結果如下述第1表所示。第5圖係顯示翹曲量的測定點之示意圖。70為「測定點」，71為偏光板，72為玻璃板。25個「測定點」，為在距離偏光板的端部起大約為7mm內側的區域中之點，短邊方向以約20mm的間隔，長邊方向以約35mm的間隔來配置。 Then, the focal point is focused on the surface of the measuring table, using this as a reference, the focal points are respectively focused on 25 points on the surface of the laminated body, and the height from the focal point as the reference is measured. The difference between the maximum value and the minimum value of the height of the 25-point measurement point was made into the amount of warpage. The results are shown in Table 1 below. Fig. 5 is a schematic diagram showing the measuring points of the warpage amount. 70 is the "measurement point", 71 is the polarizing plate, and 72 is the glass plate. The 25 "measuring points" are points in an area approximately 7 mm inside from the end of the polarizing plate. They are arranged at intervals of approximately 20 mm in the short-side direction and approximately 35 mm in the long-side direction.
(在高溫環境下之面板的翹曲) (Warpage of the panel in a high temperature environment)
於上述積層體的製作時，除了使用厚度0.4mm的無鹼玻璃之外，其他皆相同，而得到由觀看側偏光板A/玻璃板 /背面側偏光板A所構成之積層體。再者，於任一實施例中，觀看側偏光板的水分率皆為1.13%，背面側偏光板的水分率皆為0.6%，兩者的差為0.53%。 In the production of the above laminated body, except for the use of alkali-free glass with a thickness of 0.4mm, the others are the same, and the viewing side polarizing plate A/glass plate is obtained. /Layered body composed of polarizing plate A on the back side. Furthermore, in any embodiment, the moisture content of the viewing side polarizing plate is 1.13%, and the moisture content of the back side polarizing plate is 0.6%, and the difference between the two is 0.53%.
將上述積層體，於溫度85℃、濕度5%RH的環境下靜置250小時。然後以觀看側偏光板A為上側之方式，將積層體放置在二維測定器(Nikon股份有限公司製、NEXIV(註冊商標)VMZ-R4540)的測定台上。 The above-mentioned laminate was allowed to stand for 250 hours in an environment with a temperature of 85° C. and a humidity of 5% RH. Then, with the viewing side polarizing plate A on the upper side, the laminated body was placed on the measurement table of a two-dimensional measuring device (manufactured by Nikon Co., Ltd., NEXIV (registered trademark) VMZ-R4540).
繼而，與上述在常溫環境下之面板的翹曲之測定相同方式，將焦點對焦於測定台的表面，以此為基準，將焦點分別對焦於積層體之面上的25點，並測定自作為基準的焦點起之高度。將25點的測定點之高度的最大值與最小值之差設為翹曲量。結果如下述第1表所示。 Then, in the same way as the above-mentioned measurement of the warpage of the panel under the normal temperature environment, focus the focus on the surface of the measurement table, use this as a reference, focus the focus on each of the 25 points on the surface of the laminate, and measure it as The height from the focus of the datum. The difference between the maximum value and the minimum value of the height of the 25-point measurement point was made into the amount of warpage. The results are shown in Table 1 below.
(實施例2至4、比較例1至3) (Examples 2 to 4, Comparative Examples 1 to 3)
將觀看側偏光板及背面側偏光板之組合設為如下述第1表所示，並測定各積層體之在常溫環境下之面板的翹曲及在高溫環境下之面板的翹曲。該結果彙總於下述第1表。實施例1至4中，於常溫環境下及高溫環境下，液晶面板之翹曲的大小皆為0.4mm以下。比較例1至3中，不論於常溫環境下或高溫環境下之任一環境下，液晶面板之翹曲的大小皆超過0.4mm。 The combination of the viewing side polarizing plate and the back side polarizing plate was set as shown in Table 1 below, and the warpage of the panel under the normal temperature environment and the panel warpage under the high temperature environment of each laminate was measured. The results are summarized in Table 1 below. In Examples 1 to 4, the warpage of the liquid crystal panel is 0.4 mm or less under normal temperature environment and high temperature environment. In Comparative Examples 1 to 3, the warpage of the liquid crystal panel exceeds 0.4 mm regardless of the normal temperature environment or the high temperature environment.
(實施例5至13) (Examples 5 to 13)
將觀看側偏光板及背面側偏光板之組合設為如下述第2表所示，並測定各積層體之在常溫環境下之面板的翹曲及在高溫環境下之面板的翹曲時，於常溫環境下及高溫環 境下，液晶面板之翹曲的大小皆為0.4mm以下。 Set the combination of the viewing side polarizing plate and the back side polarizing plate as shown in Table 2 below, and measure the warpage of the panel under the normal temperature environment and the panel warpage under the high temperature environment of each laminate. Normal temperature environment and high temperature ring Under the circumstances, the warpage of the liquid crystal panel is less than 0.4mm.
根據本發明之偏光板之套組，不僅可減少液晶面板在高溫環境下的翹曲，同時亦可減少液晶面板在常溫環境下的翹曲。 The polarizing plate set according to the present invention can not only reduce the warpage of the liquid crystal panel in a high temperature environment, but also reduce the warpage of the liquid crystal panel in a normal temperature environment.
1‧‧‧觀看側偏光板 1‧‧‧Viewing side polarizer
2‧‧‧背面側偏光板 2‧‧‧Back side polarizing plate
10‧‧‧第1偏光片 10‧‧‧The first polarizer
11‧‧‧第2偏光片 11‧‧‧Second Polarizer
20‧‧‧第1保護膜 20‧‧‧The first protective film
21‧‧‧第2保護膜 21‧‧‧Second protective film
22‧‧‧第3保護膜 22‧‧‧The third protective film
30‧‧‧亮度提升膜 30‧‧‧Brightness enhancement film
40‧‧‧第1黏著劑層 40‧‧‧The first adhesive layer
41‧‧‧第2黏著劑層 41‧‧‧Second adhesive layer
42‧‧‧第3黏著劑層 42‧‧‧The third adhesive layer
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| CN101271217A (en) * | 2007-02-28 | 2008-09-24 | 住友化学株式会社 | Liquid crystal display apparatus and polarizing panel group |
| TW201333554A (en) * | 2011-12-29 | 2013-08-16 | Woongjin Chemical Co Ltd | Multilayer reflective polarizer |
| TW201616157A (en) * | 2014-09-30 | 2016-05-01 | 住友化學股份有限公司 | Polarizing plate and method for producing the same |
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|---|---|---|---|---|
| JP6664866B2 (en) * | 2013-04-05 | 2020-03-13 | 住友化学株式会社 | Set of polarizing plate and front panel integrated liquid crystal display panel |
| WO2015166833A1 (en) * | 2014-04-28 | 2015-11-05 | シャープ株式会社 | Mirror display |
| KR102369639B1 (en) * | 2015-02-09 | 2022-03-03 | 삼성디스플레이 주식회사 | Display Device |
-
2017
- 2017-05-17 JP JP2017097963A patent/JP6455545B2/en active Active
- 2017-08-03 TW TW106126237A patent/TWI731133B/en active
-
2018
- 2018-12-17 JP JP2018235192A patent/JP2019079058A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101271217A (en) * | 2007-02-28 | 2008-09-24 | 住友化学株式会社 | Liquid crystal display apparatus and polarizing panel group |
| TW201333554A (en) * | 2011-12-29 | 2013-08-16 | Woongjin Chemical Co Ltd | Multilayer reflective polarizer |
| TW201616157A (en) * | 2014-09-30 | 2016-05-01 | 住友化學股份有限公司 | Polarizing plate and method for producing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2018032011A (en) | 2018-03-01 |
| JP6455545B2 (en) | 2019-01-23 |
| TW201809757A (en) | 2018-03-16 |
| JP2019079058A (en) | 2019-05-23 |
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