WO2012144587A1 - 長尺状円偏光板の製造方法 - Google Patents
長尺状円偏光板の製造方法 Download PDFInfo
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- WO2012144587A1 WO2012144587A1 PCT/JP2012/060679 JP2012060679W WO2012144587A1 WO 2012144587 A1 WO2012144587 A1 WO 2012144587A1 JP 2012060679 W JP2012060679 W JP 2012060679W WO 2012144587 A1 WO2012144587 A1 WO 2012144587A1
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- polarizing plate
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3016—Polarising elements involving passive liquid crystal elements
Definitions
- the present invention relates to a method for producing a long circularly polarizing plate comprising a long retardation film and a long polarizing film.
- JP-A-2002-22944 a long retardation film composed of a single polymer film stretched in an oblique direction, and a dichroic substance and a longitudinal direction
- a method of producing a long circularly polarizing plate by laminating a long polarizing film made of a polymer film stretched on a film using an adhesive.
- Such a circularly polarizing plate is excellent in productivity because it can be continuously produced by a roll.
- the present invention has been made to solve the problems of the prior art, and it is possible to continuously laminate a long retardation film and a long polarizing film without using an adhesive. And an object of the present invention is to provide a method for producing a long circularly polarizing plate excellent in continuous productivity.
- a method for producing a long circularly polarizing plate according to claim 1 of the present application includes a long retardation film having a slow axis in one direction in the plane, and a slow phase of the retardation film.
- a method for producing a long circular polarizing plate comprising a long polarizing film having an absorption axis in one direction within a range of 25 ° to 65 ° with respect to the axial direction, wherein the long retardation film is A first guide roll on the back surface of the long retardation film while traveling, and a second guide roll disposed on the downstream side of the first guide roll along the traveling direction of the long retardation film;
- the process A is a process in which a rubbing roll is pressed against the surface of the long retardation film between the first guide roll and the second guide roll, and the rubbing process is performed in the process A.
- Dichroism on the surface of the scale retardation film And a step B of applying a liquid crystalline solution containing the substance and orienting the dichroic substance to form
- the method for producing a long circularly polarizing plate according to claim 2 is the method for producing a long circularly polarizing plate according to claim 1, wherein the thickness of the long retardation film is 10 ⁇ m to 45 ⁇ m.
- the manufacturing method of the elongate circularly-polarizing plate which concerns on Claim 3 is a manufacturing method of the elongate circularly-polarizing plate of Claim 1 or Claim 2,
- the said elongate phase difference film is a polyester-type resin, a cellulose type
- the method for producing a long circularly polarizing plate according to claim 4 is the method for producing a long circularly polarizing plate according to any one of claims 1 to 3, wherein the liquid crystalline solution is a lyotropic liquid crystal compound. It is characterized by.
- the method for producing a long circularly polarizing plate according to claim 5 is the method for producing a long circularly polarizing plate according to any one of claims 1 to 4, wherein the concentration of the dichroic substance in the polarizing film is , And 80 wt% to 100 wt% with respect to the total weight of the polarizing film.
- the method for producing a long circularly polarizing plate according to claim 6 is the method for producing a long circularly polarizing plate according to any one of claims 1 to 5, wherein the thickness of the polarizing film is 0.1 ⁇ m to It is characterized by being 5 ⁇ m.
- the method for producing a long circularly polarizing plate according to claim 7 is the method for producing a long circularly polarizing plate according to any one of claims 1 to 6, wherein the thickness of the circularly polarizing plate is 50 ⁇ m or less. It is characterized by being.
- the method for producing a long circularly polarizing plate according to claim 8 is the method for producing a long circularly polarizing plate according to claim 7, wherein the thickness of the circularly polarizing plate is 20 ⁇ m to 40 ⁇ m. .
- the back surface thereof is a first guide roll and a second guide roll.
- the rubbing roll is pressed against the surface of the long retardation film, and the rubbing treatment is performed on the surface of the long retardation film. Since a liquid crystal solution containing a chromatic substance is applied and the dichroic substance is oriented to form a long polarizing film, a long retardation film and a long polarizing film can be used without using an adhesive. It becomes possible to laminate
- FIG. 1 shows a slow axis direction of a retardation film and an orientation direction of a dichroic substance when a circularly polarizing plate is produced by applying a liquid crystalline solution containing a dichroic substance on the retardation film by a conventional production method. It is explanatory drawing which shows typically the relationship.
- FIG. 2 shows the slow axis direction of the retardation film and the dichroic substance when a circularly polarizing plate is produced by applying a liquid crystalline solution containing a dichroic substance on the retardation film by the production method according to the present invention. It is explanatory drawing which shows typically the relationship with an orientation direction.
- a polarizing film by orienting a dichroic material on the film by applying a liquid crystalline solution containing the dichroic material on the film, and therefore using an adhesive.
- a polarizing film can be formed on the film without doing so.
- a liquid crystalline solution containing a dichroic substance 3 is applied to the surface of a long retardation film 2 having a slow axis direction 1 in one direction in the plane, thereby forming a long shape.
- the dichroic material 3 tends to be oriented so that the absorption axis direction 4 (major axis direction of the molecule) and the slow axis direction 1 of the retardation film are parallel to each other.
- the dichroic substance 3 may be oriented so that the long axis direction 4 of the dichroic substance 3 is orthogonal to the slow axis direction 1.
- the absorption axis direction 4 of the dichroic substance 3 is oriented in an arbitrary angle range, for example, a range of 25 ° to 65 ° with respect to the slow axis direction 1 in the plane of the retardation film 2. It was difficult to do.
- the dichroic substance 3 is absorbed in the absorption axis direction 4 (molecular Is aligned so that the rubbing treatment direction 6 is parallel to the rubbing treatment direction 6 (in the example shown in FIG. 2, the slow axis direction 1 and the rubbing treatment direction 6 form about 45 °).
- the absorption axis direction 4 may be oriented so as to be orthogonal to the rubbing treatment direction 6.
- orientation regulating force of the rubbing treatment exerted on the dichroic material 3 is given priority over the orientation regulating force in the slow axis direction 1 of the retardation film 2.
- Polarized light applied to the surface of the long retardation film 2 by setting the angle between the slow axis direction 1 of the retardation film 2 and the rubbing direction 6 to a desired angle in the range of 25 ° to 65 °.
- a long circularly polarizing plate in which the absorption axis direction 4 of the dichroic substance 3 in the film exists in one direction in the range of 25 ° to 65 ° with respect to the slow axis direction 1 of the long retardation film 2 Can be manufactured.
- the elongate circularly-polarizing plate of this embodiment is the elongate phase-difference film which has a slow axis in one direction in a surface, and phase difference And a long polarizing film having an absorption axis in one direction in a range of 25 ° to 65 ° with respect to the slow axis direction of the film. It is manufactured by performing B. In addition, between the process A and the process B, arbitrary processes may be included.
- the process A is performed by moving the long retardation film 2 along the traveling direction 5 while moving the back surface of the long retardation film 2 to the first guide roll. 7 and the second guide roll 8 disposed downstream of the first guide roll 7 in the traveling direction 5, and between the first guide roll 7 and the second guide roll 8,
- the rubbing roll 9 is pressed against the surface of the long retardation film 2 to be rubbed.
- Such a rubbing treatment method is also called a tension web type rubbing treatment in the circularly polarizing plate manufacturing industry, and is characterized in that there is no back roll at a position facing the rubbing roll 9. By using such rubbing treatment, it is possible to obtain a long circularly polarizing plate with excellent quality.
- the guide rolls 7 and 8 are for supporting the long retardation film 2 while rotating while in contact with the back surface of the long retardation film 2.
- the types and sizes of the guide rolls 7 and 8 are not particularly limited, but are usually made of rubber or metal and have a diameter of 10 mm to 500 mm.
- the first guide roll 7 and the second guide roll 8 may be the same or different.
- the rubbing treatment is performed to align the dichroic material 3 when a liquid crystalline solution containing the dichroic material 3 is applied to the surface of the long retardation film 2. Is rubbed with a rubbing cloth.
- the rubbing process is performed, for example, by pressing a rubbing roll 9 around a roller of a rubbing cloth having a raised pile against the surface of the traveling long retardation film 2 while rotating it in one direction.
- a rubbing cloth For example, cotton, rayon, etc. are used.
- the arrangement angle of the rubbing roll 9 with respect to the traveling direction 5 of the long retardation film 2 is appropriately set according to the purpose.
- the pushing amount H of the rubbing roll 9 (distance from the surface of the long retardation film 2 before the rubbing roll 9 contacts: see FIG. 3) is such that the dichroic material 3 is oriented in the rubbing treatment direction. Is set as appropriate.
- the indentation amount H is preferably 5 mm to 30 mm. Under such conditions, the orientation regulating force in the rubbing treatment direction 6 becomes larger than the orientation regulating force in the slow axis direction 1 of the long retardation film 2.
- a liquid crystalline solution containing the dichroic material 3 is applied to the surface of the long retardation film 2 subjected to the rubbing process in the above step A, and the dichroic material 3 is oriented.
- the liquid crystalline solution usually contains a dichroic substance 3 and a solvent.
- the dichroic material is preferably a lyotropic liquid crystal compound.
- the lyotropic liquid crystal compound refers to a compound exhibiting liquid crystallinity in a state dissolved in a solvent.
- lyotropic liquid crystal compound for example, an azo compound, an anthraquinone compound, a perylene compound, a quinophthalone compound, a naphthoquinone compound, a merocyanine compound, and the like are preferable. This is because it exhibits absorption dichroism in the visible light region and excellent orientation.
- the concentration of the dichroic substance 3 is preferably 2 to 30% by weight of the dichroic substance 3 with respect to the total weight of the liquid crystal solution.
- the liquid crystal solution may be applied by any method that can uniformly cast the liquid crystal solution. For example, a wire bar, a gap coater, a comma coater, a gravure coater, a slot die, or the like can be used. At this time, the applied liquid crystalline solution may be naturally dried or heat dried.
- the long circularly polarizing plate obtained by the manufacturing method according to the present embodiment has any visible light region (wavelength of 380 nm to 780 nm) when linearly polarized light is incident from a specific direction. At this wavelength, circularly polarized light is generated.
- the long circularly polarizing plate has a long retardation film 2 having a slow axis in one direction in the plane (slow axis direction 1), and 25 ° with respect to the slow axis direction 1 of the retardation film 2. And a long polarizing film having an absorption axis in one direction (absorption axis direction 4) in a range of ⁇ 65 °.
- the long circular polarizing plate is natural light or Linearly polarized light can be converted to circularly polarized light.
- the “long shape” means that the length is sufficiently larger than the width, and preferably the length is 10 times or more the width.
- the length of the long circularly polarizing plate is preferably 300 m or more.
- the total thickness of the long circularly polarizing plate is preferably 50 ⁇ m or less, more preferably 20 ⁇ m to 40 ⁇ m.
- the long retardation film 2 has a slow axis in one direction in the plane (slow axis direction 1).
- the slow axis direction 1 of the long retardation film 2 is preferably 25 ° to 65 ° with respect to the length direction.
- the thickness of the long retardation film 2 is preferably 10 ⁇ m to 45 ⁇ m.
- the material for forming the long retardation film 2 is not particularly limited, and examples thereof include polyester resins, cellulose resins, cycloolefin resins, and acrylic resins.
- the long polarizing film exhibits absorption dichroism at any wavelength in the visible light region, and has an absorption axis in one direction in the plane (absorption axis direction 4). Absorption dichroism is obtained by orienting the dichroic material 3 in the polarizing film.
- the absorption axis direction 4 of the long polarizing film is parallel or orthogonal to the length direction (see FIG. 2).
- the concentration of the dichroic substance 3 in the polarizing film is preferably 80% by weight to 100% by weight with respect to the total weight of the polarizing film.
- the thickness of the polarizing film is preferably 0.1 ⁇ m to 5 ⁇ m.
- the long circularly polarizing plate obtained by this embodiment is used for, for example, a liquid crystal display or an organic EL display, and can realize high contrast even on a large screen. .
- FIG. 3 and FIG. A rubbing treatment was performed in the same manner as shown in 1.
- a liquid crystalline solution containing the dichroic substance 3 an azo compound prepared according to Example 1 of JP-A-2009-173849 is dissolved in water on the rubbing-treated surface of the long retardation film 2 And prepared by natural drying to form a long polarizing film having a thickness of 0.4 ⁇ m.
- the total thickness of the long circularly polarizing plate thus obtained was 33 ⁇ m.
- Measurement Method Used in Examples (1) Measurement of Thickness Measurement was performed using a digital gauge (manufactured by Ozaki Seisakusho, product name “PEACOCK”). (2) Quality evaluation A sample cut out from the long circular polarizing plate of the example was placed on a white light source, the sample was rotated left and right, and the size and amount of scratches caused by the rubbing treatment were visually observed. did.
- the present invention is capable of continuously laminating a long retardation film and a long polarizing film without using an adhesive, and producing a long circular polarizing plate excellent in continuous productivity.
- a method can be provided, and the effect produced in the industry is great.
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Abstract
Description
請求項3に係る長尺状円偏光板の製造方法は、請求項1又は請求項2の長尺状円偏光板の製造方法において、前記長尺状位相差フィルムは、ポリエステル系樹脂、セルロース系樹脂、シクロオレフィン系樹脂又はアクリル系樹脂から形成されていることを特徴とする。
請求項4に係る長尺状円偏光板の製造方法は、請求項1乃至請求項3のいずれかの長尺状円偏光板の製造方法において、前記液晶性溶液は、リオトロピック液晶化合物であることを特徴とする。
請求項5に係る長尺状円偏光板の製造方法は、請求項1乃至請求項4のいずかの長尺状円偏光板の製造方法において、前記偏光膜における二色性物質の濃度は、偏光膜の総重量に対して80重量%~100重量%であることを特徴とする。
請求項6に係る長尺状円偏光板の製造方法は、請求項1乃至請求項5のいずれかの長尺状円偏光板の製造方法において、前記偏光膜の厚さは、0.1μm~5μmであることを特徴とする。
請求項7に係る長尺状円偏光板の製造方法は、請求項1乃至請求項6のいずかの長尺状円偏光板の製造方法において、前記円偏光板の厚さは、50μm以下であることを特徴とする。
請求項8に係る長尺状円偏光板の製造方法は、請求項7の長尺状円偏光板の製造方法において、前記円偏光板の厚さは、20μm~40μmであることを特徴とする。
このため、上記位相差フィルム2の面内で遅相軸方向1に対して、任意の角度範囲、例えば25°~65°の範囲における一方向に二色性物質3の吸収軸方向4を配向させることは困難なものであった。
本実施形態の長尺状円偏光板は、面内の一方向に遅相軸を有する長尺状位相差フィルムと、位相差フィルムの遅相軸方向に対して25°~65°の範囲における一方向に吸収軸を有する長尺状偏光膜とを備えており、かかる長尺状円偏光板は、後述する工程A及び工程Bを行うことにより製造される。尚、工程Aと工程Bとの間には、任意の工程を含んでいてもよい。
工程Aは、例えば、図3、図4に示すように、長尺状位相差フィルム2を走行方向5に沿って走行させながら、長尺状位相差フィルム2の裏面を、第1のガイドロール7と、第1のガイドロール7よりも走行方向5の下流側に配置された第2のガイドロール8とにより支持し、第1のガイドロール7と第2のガイドロール8との間で、長尺状位相差フィルム2の表面にラビングロール9を押し付けてラビング処理する工程である。
このようなラビング処理方法は、円偏光板製造業界においてはテンションウェブ方式のラビング処理ともいい、ラビングロール9に対向する位置において、バックロールが無いことが特徴である。このようなラビング処理を用いることによって、品質に優れた長尺状円偏光板を得ることができる。
上記押しこみ量Hは、好ましくは5mm~30mmである。このような条件であれば、長尺状位相差フィルム2の遅相軸方向1の配向規制力よりもラビング処理方向6の配向規制力が大きくなる。
工程Bは、上記工程Aにてラビング処理が行われた長尺状位相差フィルム2の表面に、二色性物質3を含む液晶性溶液を塗布して、二色性物質3を配向させて長尺状偏光膜を形成する工程である。
液晶性溶液は、通常、二色性物質3と溶媒とを含む。二色性物質は、好ましくはリオトロピック液晶化合物である。本実施形態において、リオトロピック液晶化合物とは、溶媒に溶解した状態で液晶性を示す化合物をいう。リオトロピック液晶化合物としては、例えば、アソ系化合物、アントラキノン系化合物、ペリレン系化合物、キノフタロン系化合物、ナフトキノン系化合物、メロシアニン系化合物等が好ましい。可視光領域に吸収二色性を示し配向性に優れるからである。
液晶性溶液の塗布方法は、液晶性溶液を均一に流延できるものであればよく、例えばワイヤーバー、ギャップコーター、コンマコーター、グラビアコーター、スロットダイなどを使用することができる。この際、塗布された液晶性溶液は、自然乾燥させてもよいし、加熱乾燥させてもよい。
本実施形態に係る製造方法により得られる長尺状円偏光板は、特定方向から直線偏光を入射させたときに、可視光領域(波長380nm~780nm)のいずれかの波長で、円偏光を生成するものである。
本実施形態において、「長尺状」とは、長さが幅よりも十分に大きいものをいい、好ましくは長さが幅の10倍以上であるものをいう。長尺状円偏光板の長さは、好ましくは300m以上である。長尺状円偏光板の総厚さは、好ましくは50μm以下であり、さらに好ましくは20μm~40μmである。
本実施形態により得られた長尺状円偏光板は、例えば、液晶ディスプレイや有機ELディスプレイに使用され、大画面においても高いコントラストを実現することができる。
(1)厚さの測定
デジタルゲージ((株)尾崎製作所製、製品名「PEACOCK」)を用いて測定した。
(2)品質の評価
白色光源の上に実施例の長尺状円偏光板から切り出したサンプルを載せ、当該サンプルを左右に回転させて、ラビング処理により生じたキズの大きさ、量を目視観察した。
2 長尺状位相差フィルム
3 二色性物質
4 吸収軸方向(分子の長軸方向)
5 走行方向
6 ラビング処理方向
7 第1のガイドロール
8 第2のガイドロール
9 ラビングロール
Claims (8)
- 面内の一方向に遅相軸を有する長尺状位相差フィルムと、
前記位相差フィルムの遅相軸方向に対して25°~65°の範囲における一方向に吸収軸を有する長尺状偏光膜とを備えた長尺状円偏光板の製造方法であって、
前記長尺状位相差フィルムを走行させながら長尺状位相差フィルムの裏面を第1のガイドロールと、長尺状位相差フィルムの走行方向に沿って第1のガイドロールよりも下流側に配置された第2のガイドロールとにより支持し、第1のガイドロールと第2のガイドロールとの間で長尺状位相差フィルムの表面にラビングロールを押し付けてラビング処理する工程Aと、
前記工程Aでラビング処理された前記長尺状位相差フィルムの表面に、二色性物質を含む液晶性溶液を塗布するとともに二色性物質を配向させて長尺状偏光膜を形成する工程Bとを含む長尺状円偏光板の製造方法。 - 前記長尺状位相差フィルムの厚さは、10μm~45μmであることを特徴とする請求項1に記載の長尺状円偏光板の製造方法。
- 前記長尺状位相差フィルムは、ポリエステル系樹脂、セルロース系樹脂、シクロオレフィン系樹脂又はアクリル系樹脂から形成されていることを特徴とする請求項1又は請求項2に記載の長尺状円偏光板の製造方法。
- 前記液晶性溶液は、リオトロピック液晶化合物であることを特徴とする請求項1乃至請求項3のいずれかに記載の長尺状円偏光板の製造方法。
- 前記偏光膜における二色性物質の濃度は、偏光膜の総重量に対して80重量%~100重量%であることを特徴とする請求項1乃至請求項4のいずれかに記載の長尺状円偏光板の製造方法。
- 前記偏光膜の厚さは、0.1μm~5μmであることを特徴とする請求項1乃至請求項5のいずれかに記載の長尺状円偏光板の製造方法。
- 前記円偏光板の厚さは、50μm以下であることを特徴とする請求項1乃至請求項6のいずれかに記載の長尺状円偏光板の製造方法。
- 前記円偏光板の厚さは、20μm~40μmであることを特徴とする請求項7に記載の長尺状円偏光板の製造方法。
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US13/811,845 US20140044870A1 (en) | 2011-04-22 | 2012-04-20 | Manufacturing method of long-sized circularly polarizing plate |
CN201280015763.2A CN103534624A (zh) | 2011-04-22 | 2012-04-20 | 长尺寸圆偏光板的制造方法 |
KR1020137024153A KR20130130045A (ko) | 2011-04-22 | 2012-04-20 | 장척상 원편광판의 제조 방법 |
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JP2011095674A JP2012226231A (ja) | 2011-04-22 | 2011-04-22 | 長尺状円偏光板の製造方法 |
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Cited By (1)
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US9507068B2 (en) | 2014-02-07 | 2016-11-29 | Sumitomo Chemical Company, Limited | Method for producing elongate polarizer plate |
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JP2014170221A (ja) | 2013-02-07 | 2014-09-18 | Nitto Denko Corp | 円偏光板および屈曲可能な表示装置 |
KR102329698B1 (ko) * | 2013-08-09 | 2021-11-23 | 스미또모 가가꾸 가부시키가이샤 | 장척 원편광판의 제조 방법 및 장척 원편광판 |
WO2016047465A1 (ja) * | 2014-09-26 | 2016-03-31 | 日本ゼオン株式会社 | 長尺の円偏光板、長尺の広帯域λ/4板、有機エレクトロルミネッセンス表示装置、及び、液晶表示装置 |
KR101915923B1 (ko) * | 2015-01-19 | 2018-11-06 | 가부시키가이샤 오루투스 테크놀로지 | 액정 표시 장치 및 헤드업 디스플레이 장치 |
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- 2012-04-20 KR KR1020137024153A patent/KR20130130045A/ko not_active Application Discontinuation
- 2012-04-20 US US13/811,845 patent/US20140044870A1/en not_active Abandoned
- 2012-04-20 WO PCT/JP2012/060679 patent/WO2012144587A1/ja active Application Filing
- 2012-04-20 TW TW101114323A patent/TWI465760B/zh not_active IP Right Cessation
- 2012-04-20 CN CN201280015763.2A patent/CN103534624A/zh active Pending
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WO2008007782A1 (en) * | 2006-07-13 | 2008-01-17 | Zeon Corporation | Method for producing circularly polarized light isolation sheet, and apparatus for coating film formation |
JP2009251288A (ja) * | 2008-04-07 | 2009-10-29 | Nitto Denko Corp | 楕円偏光板並びにその製造方法 |
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TWI465760B (zh) | 2014-12-21 |
CN103534624A (zh) | 2014-01-22 |
US20140044870A1 (en) | 2014-02-13 |
JP2012226231A (ja) | 2012-11-15 |
TW201300822A (zh) | 2013-01-01 |
KR20130130045A (ko) | 2013-11-29 |
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