JPH0952240A - Production of optical transparent film - Google Patents
Production of optical transparent filmInfo
- Publication number
- JPH0952240A JPH0952240A JP20439095A JP20439095A JPH0952240A JP H0952240 A JPH0952240 A JP H0952240A JP 20439095 A JP20439095 A JP 20439095A JP 20439095 A JP20439095 A JP 20439095A JP H0952240 A JPH0952240 A JP H0952240A
- Authority
- JP
- Japan
- Prior art keywords
- film
- coating
- solution
- thickness
- polysulfone resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 238000001035 drying Methods 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 238000005266 casting Methods 0.000 abstract description 19
- 238000000034 method Methods 0.000 abstract description 13
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000010408 film Substances 0.000 description 113
- 239000011248 coating agent Substances 0.000 description 57
- 238000000576 coating method Methods 0.000 description 57
- 229920002492 poly(sulfone) Polymers 0.000 description 40
- 229920005989 resin Polymers 0.000 description 38
- 239000011347 resin Substances 0.000 description 38
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 12
- 229920002799 BoPET Polymers 0.000 description 11
- RDOXTESZEPMUJZ-UHFFFAOYSA-N anisole Chemical compound COC1=CC=CC=C1 RDOXTESZEPMUJZ-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 6
- 239000002985 plastic film Substances 0.000 description 6
- 229920006255 plastic film Polymers 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- UZKWTJUDCOPSNM-UHFFFAOYSA-N methoxybenzene Substances CCCCOC=C UZKWTJUDCOPSNM-UHFFFAOYSA-N 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000007602 hot air drying Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- -1 polyethylene terephthalate Polymers 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 229920001230 polyarylate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 102100033806 Alpha-protein kinase 3 Human genes 0.000 description 1
- 101710082399 Alpha-protein kinase 3 Proteins 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- IDCBOTIENDVCBQ-UHFFFAOYSA-N TEPP Chemical compound CCOP(=O)(OCC)OP(=O)(OCC)OCC IDCBOTIENDVCBQ-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920003223 poly(pyromellitimide-1,4-diphenyl ether) Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920006380 polyphenylene oxide Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Polarising Elements (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光学用透明フィル
ムの製造方法に関する。TECHNICAL FIELD The present invention relates to a method for producing an optical transparent film.
【０００２】[0002]
【従来の技術】近年、液晶ディスプレー等の画像表示装
置に光学用プラスチックフィルムが汎用されるようにな
ってきている。これらの例は枚挙に暇ないが、例えば、
偏光板の保護フィルム等に用いられる低複屈折性の透明
フィルム、防眩材料等に用いられる１／４λの位相差を
有する複屈折性の透明フィルム、ＳＴＮ液晶を用いた液
晶ディスプレー等の複屈折による位相差を補償する位相
差補償フィルム等があげられる。2. Description of the Related Art In recent years, optical plastic films have been widely used in image display devices such as liquid crystal displays. I have no time to enumerate these examples, but for example,
A low-birefringence transparent film used as a protective film for a polarizing plate, a birefringence transparent film having a phase difference of 1 / 4λ used as an antiglare material, a birefringence such as a liquid crystal display using STN liquid crystal. A retardation compensation film for compensating the retardation due to
【０００３】上記光学用プラスチックフィルムは、主と
して、Ｔダイ法等の溶融キャスト製膜法と、溶液キャス
ト製膜法によって製造されている。上記溶融キャスト製
膜法は、例えば、特開昭５２−１４７６６２号公報に記
載されている如く、加熱溶融された熱可塑性樹脂を金型
よりフィルム状に押出して支持体表面にキャスト（流
延）して冷却し、製膜するものである。The above-mentioned optical plastic film is mainly manufactured by a melt cast film forming method such as a T-die method and a solution cast film forming method. In the melt casting film forming method, for example, as described in JP-A-52-147662, a heat-melted thermoplastic resin is extruded in a film form from a mold and cast (cast) on the surface of a support. Then, it is cooled and a film is formed.
【０００４】しかし、上記溶融キャスト製膜法によって
得られるフィルムは、溶融残渣や異物等を核にして形成
されるフィッシュアイによる透明性や平滑性等の外観品
質が低劣であるだけでなく、厚さの精度も充分でなく、
上記製膜装置の機械加工精度から限度があり、良質の光
学用プラスチックフィルムを得ることができない。However, the film obtained by the above-mentioned melt cast film forming method is not only poor in the appearance quality such as transparency and smoothness due to the fish eye formed by using the molten residue and foreign matters as a core, but also has a large thickness. Is not accurate enough,
There is a limit due to the machining accuracy of the film forming apparatus, and a good quality plastic film for optics cannot be obtained.
【０００５】上記溶液キャスト製膜法は、例えば、特開
平２−１１１５１１号公報に記載されている如く、プラ
スチックを適宜溶剤に溶解した溶液や重合性モノマー等
を含む溶液を、コンマコーター、リップコーター、ドク
ターブレードコーター、バーコーター、ロールコーター
等のコーターを用いて、ステンレススチールベルト、ス
テンレススチールドラム、離型性を有するプラスチック
フィルム等の支持体表面にキャストし、加熱して溶剤を
揮散しもしくは重合性モノマーを重合させた後、形成し
たフィルムを上記支持体から剥離して光学用プラスチッ
クフィルムを得るものである。In the solution cast film forming method, as described in, for example, Japanese Patent Application Laid-Open No. 2-111511, a solution in which plastic is appropriately dissolved in a solvent or a solution containing a polymerizable monomer is used as a comma coater or a lip coater. Using a coater such as a doctor blade coater, a bar coater, or a roll coater, cast on a support surface such as a stainless steel belt, a stainless steel drum, a plastic film having releasability, and heat to volatilize or polymerize the solvent. After the polymerizable monomer is polymerized, the formed film is peeled from the support to obtain an optical plastic film.
【０００６】上記溶液キャスト製膜法は、キャストする
溶液の固形分が１００％でないため、前記する各種コー
ターの機械精度に起因する厚さのバラツキに固形分比率
を乗じたものが乾燥後のフィルムの厚さのバラツキとな
り、上記溶融キャスト製膜法に比して厚さのバラツキは
小さくなる。又、キャストする際の溶液の粘度は、溶融
キャスト製膜法に比して低いので保留粒径の小さいフィ
ルターによってゲル化した材料や異物を除去することが
容易となり、透明性や平滑性等の外観品質も溶融キャス
ト製膜法に比して改善される。In the above solution cast film forming method, since the solid content of the solution to be cast is not 100%, the film thickness after drying is obtained by multiplying the variation in thickness due to the mechanical accuracy of the various coaters described above by the solid content ratio. The thickness variation becomes smaller than that of the above-mentioned melt cast film forming method. Further, since the viscosity of the solution during casting is lower than that in the melt casting film forming method, it becomes easy to remove gelated materials and foreign substances with a filter having a small retained particle size, and transparency, smoothness, etc. The appearance quality is also improved as compared with the melt cast film forming method.
【０００７】しかし、上記溶液キャスト製膜法において
使用されるコーターの機械加工精度や使用するキャスト
用溶液にもまして、キャストされた上記溶液の被膜を加
熱乾燥する工程での加熱乾燥条件及びそのバラツキによ
って、得られる光学用プラスチックフィルムの厚さのバ
ラツキやその他の光学的歪みを生じ、反射像や透過像を
歪ませるといった光学用フィルムとしての欠陥を露呈す
るものであった。However, the heating and drying conditions and their variations in the step of heating and drying the cast film of the above-mentioned solution are higher than the machining accuracy of the coater used in the above solution-cast film forming method and the casting solution used. As a result, variations in the thickness of the obtained optical plastic film and other optical distortions are caused, and defects as an optical film, such as distorting a reflected image or a transmitted image, are exposed.
【０００８】[0008]
【発明が解決しようとする課題】本発明は、叙上の事実
に鑑みなされたものであって、その目的とするところ
は、厚さのバラツキが小さく、光学的歪みを抑えた光学
用透明フィルムの製造方法を提供するにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above facts, and an object of the present invention is to provide an optical transparent film having a small variation in thickness and suppressing optical distortion. In order to provide the manufacturing method of.
【０００９】[0009]
【課題を解決するための手段】本発明は、乾燥時の液温
における溶液粘度（η）が１０poise 以上である溶液キ
ャスト製膜において、乾燥工程における溶液キャスト面
の法線方向の風速Ｖ（ｍ／秒）が下式（１）に示される
範囲にあることを特徴とする光学用透明フィルムの製造
方法をその要旨とするものである。Means for Solving the Problems The present invention is directed to a solution cast film formation in which the solution viscosity (η) at the liquid temperature during drying is 10 poise or more, and the wind velocity V (m in the normal direction to the solution cast surface in the drying step. / Sec) is in the range represented by the following formula (1), which is a gist of the method for producing an optical transparent film.
【００１０】[0010]
【化２】 Embedded image
【００１１】本発明において光学用透明フィルムを構成
する造膜材料としては、溶液キャストし得る溶剤があ
り、乾燥後に透明フィルムを形成し得る高分子であれば
特に限定されるものではないが、例えば、ポリカーボネ
ート、ポリスチレン、ポリメタクリル酸メチル、ポリア
リレート、ポリサルホン、ポリエーテルサルホン、ポリ
フェニレンオキサイド等が挙げられる。上記高分子を溶
解する溶剤は、各々の高分子を均一、且つ、好ましい速
度で溶解する溶剤から適宜選択使用されるが、例えば、
ポリカーボネートに対し塩化メチレン、ポリサルホンに
対しアニソール、ポリスチレンに対しメチルエチルケト
ンやトルエン、ポリアリレートに対し塩化メチレン等が
挙げられる。In the present invention, the film-forming material constituting the optical transparent film includes a solvent capable of solution casting and is not particularly limited as long as it is a polymer capable of forming a transparent film after drying. , Polycarbonate, polystyrene, polymethylmethacrylate, polyarylate, polysulfone, polyethersulfone, polyphenylene oxide and the like. The solvent that dissolves the polymer is uniformly used for each polymer, and is appropriately selected and used from the solvent that dissolves at a preferable rate.
Examples include methylene chloride for polycarbonate, anisole for polysulfone, methyl ethyl ketone or toluene for polystyrene, and methylene chloride for polyarylate.
【００１２】上記溶液キャスト製膜に使用されるキャス
ト用支持体としては、上記キャスト溶液に用いられる溶
剤に侵されず、且つ、表面が平滑性に優れるものであれ
ば特に限定されるものではないが、例えば、銅やステン
レス鋼等の金属、ポリイミド、ポリエチレンテレフタレ
ート、ポリエチレンナフタレート等の熱変形性の低い合
成樹脂、上記金属の表面にガラスやセラミックスを被覆
したもの或いはこれらの支持体の表面をシリコーン樹脂
やフッ素樹脂等で離型処理したものが、ドラム、エンド
レスベルト、板、フィルム等の形態で使用される。The support for casting used in the solution casting film formation is not particularly limited as long as it is not attacked by the solvent used in the casting solution and has a smooth surface. However, for example, a metal such as copper or stainless steel, a polyimide, polyethylene terephthalate, a synthetic resin having low thermal deformability such as polyethylene naphthalate, a glass or ceramics coated on the surface of the metal or the surface of these supports A release agent such as a silicone resin or a fluororesin is used in the form of a drum, an endless belt, a plate, a film or the like.
【００１３】本発明の溶液キャスト製膜における塗膜の
乾燥手段は、熱風乾燥手段を含むものであれば、特に限
定されるものではない。上記熱風乾燥手段としては、例
えば、支持体上の塗膜の法線方向に設置された複数対の
熱風吹出しノズルから前記キャスト溶液の粘度に応じて
与えられる風速の範囲内で熱風を吹き出して乾燥するも
のであってもよく、又、上記塗膜面とその反対側の支持
体面の両面から熱風を吹き出して乾燥するものであって
もよい。更に、塗膜面に対して斜め方向の吹出ノズルか
ら熱風が吹き出されてもよい。又、上記支持体や搬送ロ
ールの加熱による乾燥や赤外線等の輻射熱を補助乾燥手
段として併用してもよい。The means for drying the coating film in the solution cast film formation of the present invention is not particularly limited as long as it includes means for drying with hot air. As the hot air drying means, for example, hot air is blown and dried within a range of a wind speed given according to the viscosity of the cast solution from a plurality of pairs of hot air blowing nozzles installed in the normal direction of the coating film on the support. Alternatively, it may be dried by blowing hot air from both sides of the coating film surface and the support surface opposite thereto. Further, hot air may be blown out from a blowing nozzle that is oblique to the surface of the coating film. Further, drying by heating the above-mentioned support or a transport roll or radiant heat such as infrared rays may be used together as an auxiliary drying means.
【００１４】上記熱風乾燥手段における熱風のキャスト
溶液塗膜面に対する法線方向の成分の風速Ｖ（ｍ／秒）
が、乾燥時の上記キャスト溶液温度における溶液粘度が
１０poise 以上である場合、その粘度η（poise ）に応
じて前記式（１）に示した範囲内とすることによって、
乾燥された塗膜の表面状態や厚さのバラツキを小さく
し、光学的に歪みの小さいフィルムが得られるのであ
る。これは、乾燥時の熱風により、塗布面に生じた塗工
スジの如き膜厚のバラツキが解消し、結果的に塗布面の
レベリングが促進されるためであると推定される。Wind velocity V (m / sec) of the component in the direction normal to the surface of the cast solution coating film of the hot air in the hot air drying means
However, when the solution viscosity at the temperature of the casting solution at the time of drying is 10 poise or more, by setting it within the range shown in the formula (1) according to the viscosity η (poise),
The variation in the surface condition and thickness of the dried coating film can be reduced, and a film with small optical distortion can be obtained. It is presumed that this is because hot air during drying eliminates variations in film thickness such as coating streaks on the coated surface, and consequently promotes leveling of the coated surface.
【００１５】上記熱風による塗膜表面の挙動としては、
次のような関係が認められる。即ち、粘度が大きいと熱
風の影響を受けにくくなり、塗膜表面の乱れが生じにく
いため、大きい風速で乾燥を行わなければレベリング効
果を得にくい。一方、粘度が低くなるに従って、小さい
風速によっても塗膜表面の乱れが生じ、レベリング効果
も大きいが、粘度が１０poise 未満であると、熱風によ
る塗膜表面の乱れが大きくなり、レベリングの範囲を超
えて逆に平滑な表面の塗膜を得ることができなくなる。
又、上記粘度が１０poise 未満の塗膜と同様に、前記式
（１）に示した範囲の上限を超える場合も、熱風による
塗膜表面の乱れがレベリングの範囲を超えて大きくな
り、大きい風速で攪乱された塗膜表面が光学的な歪みと
して視認され、前記式（１）に示した範囲の下限未満に
なる場合には、レベリング効果は得られず、このような
風速Ｖ（ｍ／秒）で乾燥された塗膜から得られるフィル
ムは、塗工スジがそのまま光学的な歪みとして視認さ
れ、これらのフィルムを一軸延伸処理を行っても上記光
学的な歪みは是正されない。以上の事実に基づき、前記
式（１）が案出されたのである。The behavior of the coating film surface due to the hot air is as follows.
The following relationships are recognized. That is, when the viscosity is high, the influence of hot air is less likely to occur and the surface of the coating film is less likely to be disturbed. Therefore, it is difficult to obtain the leveling effect unless drying is performed at a high wind speed. On the other hand, as the viscosity decreases, the surface of the coating is disturbed even with a small wind speed, and the leveling effect is large. On the contrary, it becomes impossible to obtain a coating film having a smooth surface.
Further, as in the case of the coating film having a viscosity of less than 10 poise, when the upper limit of the range shown in the above formula (1) is exceeded, the disturbance of the coating film surface due to hot air becomes large beyond the leveling range, and at a high wind speed. When the disturbed coating film surface is visually recognized as an optical distortion and is less than the lower limit of the range shown in the formula (1), the leveling effect is not obtained, and such a wind speed V (m / sec) In the film obtained from the coating film dried in step 1, the coating stripes are visually recognized as optical distortion as they are, and the optical distortion is not corrected even if these films are subjected to uniaxial stretching treatment. Based on the above facts, the above formula (1) was devised.
【００１６】[0016]
【発明の実施の形態】以下、本発明の実施の形態につい
て、実施例を挙げて更に詳細に説明する。 （実施例１）ポリサルホン樹脂（テイジンアモコエンジ
ニアリングプラスチック社製、商品名：ユーデルＰ−３
５００、ペレット状）をアニソール（みどり化学社製）
に溶解し、充分に脱泡して濃度３８重量％の塗工用ポリ
サルホン樹脂溶液を調製した。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in more detail with reference to examples. (Example 1) Polysulfone resin (made by Teijin Amoco Engineering Plastics, trade name: Udel P-3
Anisole (made by Midori Kagaku Co., Ltd.)
And was thoroughly defoamed to prepare a coating polysulfone resin solution having a concentration of 38% by weight.
【００１７】コーターヘッドとしてコンマロールを用
い、厚さ７５μｍのポリイミドフィルム（東レ−デュポ
ン社製、商品名：カプトン）をキャスト用支持体とし、
コンマロールの中央部に厚さ２５μｍ、幅５ｍｍのポリ
エチレンテレフタレート（ＰＥＴ）フィルムのリボンを
巻き付け、故意に塗工スジを発生するようにした塗布部
を準備した。乾燥方式は、ロール搬送による熱風乾燥
で、３つの乾燥ゾーンを有し、各ゾーンともキャスト面
にその上方から熱風を吹き付けて乾燥する方式である。
各ゾーンの熱風温度は、塗布部に近い方から順に、１５
０℃、１８０℃、２１０℃に設定された。A comma roll was used as the coater head, and a polyimide film (manufactured by Toray-Dupont, trade name: Kapton) having a thickness of 75 μm was used as a casting support.
A ribbon of a polyethylene terephthalate (PET) film having a thickness of 25 μm and a width of 5 mm was wound around the center of the comma roll, and a coating portion was prepared in which coating stripes were intentionally generated. The drying method is hot air drying by roll conveyance and has three drying zones, and each zone is a method of blowing hot air from above onto the casting surface to dry.
The hot air temperature in each zone is 15
It was set to 0 ° C, 180 ° C and 210 ° C.
【００１８】上記コンマコーターに上記塗工用ポリサル
ホン樹脂溶液を供給し、乾燥機における熱風のキャスト
面に対する法線方向の風速を５．５ｍ／秒に設定して厚
さ８０μｍのポリサルホン樹脂フィルムを製造した。上
記乾燥機の最初の乾燥ゾーン内におけるキャスト塗膜の
温度は１３０℃であり、この温度におけるキャスト溶液
の粘度は５９poise であった。上記の如く、故意に塗工
スジが発生するようにＰＥＴフィルムのリボンを巻き付
けた部分に相当するポリサルホン樹脂フィルムの部位を
膜厚計によって厚さ測定を行ったが、該部位の膜厚は、
８０±１μｍであり、該部位以外の膜厚のバラツキとほ
ぼ同等であった。The polysulfone resin solution for coating was supplied to the comma coater, and the air velocity in the normal direction to the cast surface of the hot air in the dryer was set to 5.5 m / sec to produce a polysulfone resin film having a thickness of 80 μm. did. The temperature of the cast coating in the first drying zone of the dryer was 130 ° C and the viscosity of the casting solution at this temperature was 59 poise. As described above, the portion of the polysulfone resin film corresponding to the portion where the ribbon of the PET film was wound so that the coating stripes were intentionally formed was subjected to thickness measurement with a film thickness meter.
The thickness was 80 ± 1 μm, which was almost the same as the variation in the film thickness other than that portion.
【００１９】上記ポリサルホン樹脂フィルムを、次い
で、１．４倍に一軸延伸処理を行い、位相差補償フィル
ムを作製した。得られた位相差補償フィルムを、偏光軸
が直交するように設置された２枚の偏光板の間に、２枚
の偏光板の偏光軸と上記位相差補償フィルムの延伸軸が
４５°の角度をなすように挟み、前記故意に塗工スジが
発生するようにした部位を観察したが、光学的なムラは
視認されなかった。The polysulfone resin film was then uniaxially stretched to 1.4 times to prepare a retardation compensation film. In the obtained retardation compensation film, the polarization axes of the two polarizing plates and the stretching axis of the retardation compensation film make an angle of 45 ° between the two polarizing plates installed so that the polarization axes are orthogonal to each other. As a result of observing the portion where the coating stripes were intentionally generated by sandwiching the sheet, the optical unevenness was not visually recognized.
【００２０】（実施例２）実施例１と同様にして、ポリ
サルホン樹脂をアニソールに溶解し、充分に脱泡して濃
度３５重量％の塗工用ポリサルホン樹脂溶液を調製し
た。(Example 2) In the same manner as in Example 1, a polysulfone resin was dissolved in anisole and sufficiently defoamed to prepare a coating polysulfone resin solution having a concentration of 35% by weight.
【００２１】実施例１と同じコンマコーターに上記塗工
用ポリサルホン樹脂溶液を供給し、乾燥機における熱風
のキャスト面に対する法線方向の風速を４．３ｍ／秒に
設定して厚さ１００μｍのポリサルホン樹脂フィルムを
製造した。上記乾燥機の最初の乾燥ゾーン内におけるキ
ャスト塗膜の温度は１３０℃であり、この温度における
キャスト溶液の粘度は２０poise であった。上記の如
く、故意に塗工スジが発生するようにＰＥＴフィルムの
リボンを巻き付けた部分に相当するポリサルホン樹脂フ
ィルムの部位を膜厚計によって厚さ測定を行ったが、該
部位の膜厚は、１００±１μｍであり、該部位以外の膜
厚のバラツキとほぼ同等であった。The above polysulfone resin solution for coating was supplied to the same comma coater as in Example 1, and the polysulfone having a thickness of 100 μm was set by setting the wind speed in the normal direction to the cast surface of the hot air in the dryer to 4.3 m / sec. A resin film was produced. The temperature of the cast coating in the first drying zone of the dryer was 130 ° C and the viscosity of the casting solution at this temperature was 20 poise. As described above, the portion of the polysulfone resin film corresponding to the portion where the ribbon of the PET film was wound so that the coating stripes were intentionally formed was subjected to thickness measurement with a film thickness meter. The thickness was 100 ± 1 μm, which was almost the same as the variation in the film thickness at other portions.
【００２２】上記ポリサルホン樹脂フィルムを、次い
で、１．３倍に一軸延伸処理を行い、位相差補償フィル
ムを作製した。得られた位相差補償フィルムを、実施例
１と同様に前記故意に塗工スジが発生するようにした部
位を観察したが、光学的なムラは視認されなかった。The polysulfone resin film was then uniaxially stretched 1.3 times to prepare a retardation compensation film. The obtained retardation compensating film was observed at the portion where the coating stripe was intentionally generated as in Example 1, but no optical unevenness was visually recognized.
【００２３】（実施例３）実施例１のアニソールに替え
て、塩化メチレン（和光純薬社製）を用い、充分に脱泡
した濃度２３重量％の塗工用ポリサルホン樹脂溶液を調
製した。Example 3 Using methylene chloride (manufactured by Wako Pure Chemical Industries, Ltd.) in place of the anisole of Example 1, a sufficiently defoamed solution of polysulfone resin for coating having a concentration of 23% by weight was prepared.
【００２４】実施例１のコーターヘッドをドクターブレ
ードコーターに替え、キャスト用支持体をＰＥＴフィル
ム（帝人社製、商品名：テトロンＯＸ）に替え、更に、
乾燥機における乾燥３ゾーンの温度を順に、４０℃、７
０℃、１００℃に設定し、実施例１と同様にして上記塗
工用ポリサルホン樹脂溶液を供給し、乾燥機における熱
風のキャスト面に対する法線方向の風速を６．０ｍ／秒
に設定して厚さ８０μｍのポリサルホン樹脂フィルムを
製造した。上記乾燥機の最初の乾燥ゾーン内におけるキ
ャスト塗膜の温度は３５℃であり、この温度におけるキ
ャスト溶液の粘度は２５poise であった。上記の如く、
故意に塗工スジが発生するようにＰＥＴフィルムのリボ
ンを巻き付けた部分に相当するポリサルホン樹脂フィル
ムの部位を膜厚計によって厚さ測定を行ったが、該部位
の膜厚は、８０±１μｍであり、該部位以外の膜厚のバ
ラツキとほぼ同等であった。The coater head of Example 1 was replaced with a doctor blade coater, the casting support was replaced with a PET film (manufactured by Teijin Ltd., trade name: Tetron OX), and further,
The temperature of the drying 3 zone in the dryer is 40 ° C, 7
The temperature was set to 0 ° C. and 100 ° C., the polysulfone resin solution for coating was supplied in the same manner as in Example 1, and the wind speed in the normal direction to the cast surface of the hot air in the dryer was set to 6.0 m / sec. A polysulfone resin film having a thickness of 80 μm was manufactured. The temperature of the cast coating in the first drying zone of the dryer was 35 ° C and the viscosity of the casting solution at this temperature was 25 poise. As mentioned above
The thickness of the portion of the polysulfone resin film corresponding to the portion around which the ribbon of the PET film was wound was intentionally measured with a film thickness meter, and the thickness of the portion was 80 ± 1 μm. There was almost the same as the variation in the film thickness other than that portion.
【００２５】上記ポリサルホン樹脂フィルムを、次い
で、１．４倍に一軸延伸処理を行い、位相差補償フィル
ムを作製した。得られた位相差補償フィルムを、実施例
１と同様に前記故意に塗工スジが発生するようにした部
位を観察したが、光学的なムラは視認されなかった。The polysulfone resin film was then uniaxially stretched to 1.4 times to prepare a retardation compensation film. The obtained retardation compensating film was observed at the portion where the coating stripe was intentionally generated as in Example 1, but no optical unevenness was visually recognized.
【００２６】（実施例４）実施例３と同様に塩化メチレ
ンを用い、充分に脱泡した濃度３３重量％の塗工用ポリ
サルホン樹脂溶液を調製した。Example 4 Methylene chloride was used in the same manner as in Example 3 to prepare a sufficiently defoamed polysulfone resin solution for coating having a concentration of 33% by weight.
【００２７】実施例３のコーターヘッドをダイコーター
に替え、実施例３と同様にして上記塗工用ポリサルホン
樹脂溶液を供給し、乾燥機における熱風のキャスト面に
対する法線方向の風速を１５．０ｍ／秒に設定して厚さ
７０μｍのポリサルホン樹脂フィルムを製造した。上記
乾燥機の最初の乾燥ゾーン内におけるキャスト塗膜の温
度は３５℃であり、この温度におけるキャスト溶液の粘
度は２５５poise であった。上記の如く、故意に塗工ス
ジが発生するようにＰＥＴフィルムのリボンを巻き付け
た部分に相当するポリサルホン樹脂フィルムの部位を膜
厚計によって厚さ測定を行ったが、該部位の膜厚は、７
０±１μｍであり、該部位以外の膜厚のバラツキとほぼ
同等であった。The coater head of Example 3 was replaced with a die coater, the above polysulfone resin solution for coating was supplied in the same manner as in Example 3, and the wind speed in the normal direction to the cast surface of the hot air in the dryer was 15.0 m. / Sec was set to produce a polysulfone resin film having a thickness of 70 μm. The temperature of the cast coating in the first drying zone of the dryer was 35 ° C and the viscosity of the casting solution at this temperature was 255 poise. As described above, the portion of the polysulfone resin film corresponding to the portion where the ribbon of the PET film was wound so that the coating stripes were intentionally formed was subjected to thickness measurement with a film thickness meter. 7
The thickness was 0 ± 1 μm, which was almost the same as the variation in the film thickness other than the region.
【００２８】上記ポリサルホン樹脂フィルムを、次い
で、１．４倍に一軸延伸処理を行い、位相差補償フィル
ムを作製した。得られた位相差補償フィルムを、実施例
１と同様に前記故意に塗工スジが発生するようにした部
位を観察したが、光学的なムラは視認されなかった。The polysulfone resin film was then uniaxially stretched to 1.4 times to prepare a retardation compensation film. The obtained retardation compensating film was observed at the portion where the coating stripe was intentionally generated as in Example 1, but no optical unevenness was visually recognized.
【００２９】（実施例５）実施例１と同様にアニソール
を用い、充分に脱泡した濃度３０重量％の塗工用ポリサ
ルホン樹脂溶液を調製した。Example 5 Anisole was used in the same manner as in Example 1 to prepare a sufficiently defoamed polysulfone resin solution for coating having a concentration of 30% by weight.
【００３０】実施例１と同様にして上記塗工用ポリサル
ホン樹脂溶液を供給し、乾燥機における熱風のキャスト
面に対する法線方向の風速を１．８ｍ／秒に設定して厚
さ８０μｍのポリサルホン樹脂フィルムを製造した。上
記乾燥機の最初の乾燥ゾーン内におけるキャスト塗膜の
温度は１３０℃であり、この温度におけるキャスト溶液
の粘度は１０poise であった。上記の如く、故意に塗工
スジが発生するようにＰＥＴフィルムのリボンを巻き付
けた部分に相当するポリサルホン樹脂フィルムの部位を
膜厚計によって厚さ測定を行ったが、該部位の膜厚は、
８０±１μｍであり、該部位以外の膜厚のバラツキとほ
ぼ同等であった。The polysulfone resin solution for coating was supplied in the same manner as in Example 1, and the air velocity in the normal direction to the cast surface of the hot air in the dryer was set to 1.8 m / sec to obtain a polysulfone resin having a thickness of 80 μm. A film was produced. The temperature of the cast coating in the first drying zone of the dryer was 130 ° C and the viscosity of the casting solution at this temperature was 10 poise. As described above, the portion of the polysulfone resin film corresponding to the portion where the ribbon of the PET film was wound so that the coating stripes were intentionally formed was subjected to thickness measurement with a film thickness meter.
The thickness was 80 ± 1 μm, which was almost the same as the variation in the film thickness other than that portion.
【００３１】上記ポリサルホン樹脂フィルムを、次い
で、１．３倍に一軸延伸処理を行い、位相差補償フィル
ムを作製した。得られた位相差補償フィルムを、実施例
１と同様に前記故意に塗工スジが発生するようにした部
位を観察したが、光学的なムラは視認されなかった。The polysulfone resin film was then uniaxially stretched to 1.3 times to prepare a retardation compensation film. The obtained retardation compensating film was observed at the portion where the coating stripe was intentionally generated as in Example 1, but no optical unevenness was visually recognized.
【００３２】（比較例１）実施例１の乾燥機における熱
風のキャスト面に対する法線方向の風速を５．５ｍ／秒
から２．８ｍ／秒に変更したこと以外、実施例１と同様
にして厚さ８０μｍのポリサルホン樹脂フィルムを作製
した。得られた未延伸のポリサルホン樹脂フィルムの、
故意に塗工スジが発生するようにＰＥＴフィルムのリボ
ンを巻き付けた部分に相当する部位の膜厚は、７５μｍ
に低下しており、塗工スジが認められ、更に、１．４倍
に一軸延伸処理された位相差補償フィルムを作製を実施
例１と同様に前記故意に塗工スジが発生するようにした
部位を観察したところ、光学的なムラとして明確に視認
された。(Comparative Example 1) In the same manner as in Example 1 except that the air velocity in the normal direction to the cast surface of the hot air in the dryer of Example 1 was changed from 5.5 m / sec to 2.8 m / sec. A polysulfone resin film having a thickness of 80 μm was produced. Of the unstretched polysulfone resin film obtained,
The film thickness of the part corresponding to the part around which the ribbon of the PET film is wound so that a coating stripe is intentionally generated is 75 μm.
The coating streak was observed, and a retardation compensation film uniaxially stretched to 1.4 times was produced to make the coating streak intentionally the same as in Example 1. When the site was observed, it was clearly visible as optical unevenness.
【００３３】（比較例２）実施例１の乾燥機における熱
風のキャスト面に対する法線方向の風速を５．５ｍ／秒
から１３．０ｍ／秒に変更したこと以外、実施例１と同
様にして厚さ８０μｍのポリサルホン樹脂フィルムを作
製した。得られた未延伸のポリサルホン樹脂フィルム
の、故意に塗工スジが発生するようにＰＥＴフィルムの
リボンを巻き付けた部分に相当する部位の膜厚は、８０
±２μｍであり、外観的には左程目立った塗工スジには
なっていないが、数字が示す如くバラツキは大きくなっ
ていた。更に、１．４倍に一軸延伸処理された位相差補
償フィルムは、実施例１と同様に前記故意に塗工スジが
発生するようにした部位を観察したところ、位相差補償
フィルム全体に光学的なムラが明確に視認された。(Comparative Example 2) In the same manner as in Example 1 except that the air velocity in the direction normal to the cast surface of the hot air in the dryer of Example 1 was changed from 5.5 m / sec to 13.0 m / sec. A polysulfone resin film having a thickness of 80 μm was produced. The unstretched polysulfone resin film thus obtained had a thickness of 80 at a portion corresponding to the portion of the PET film around which the ribbon was wound so that coating stripes were intentionally generated.
The coating streak was ± 2 μm, and the appearance was not as noticeable as the left, but the variation was large as indicated by the numbers. Further, in the retardation compensation film which was uniaxially stretched to 1.4 times, the portion where the coating stripe was intentionally generated was observed in the same manner as in Example 1, and it was found that the retardation compensation film was found to have an optical property. The unevenness was clearly visible.
【００３４】（比較例３）実施例２の乾燥機における熱
風のキャスト面に対する法線方向の風速を４．３ｍ／秒
から１．８ｍ／秒に変更したこと以外、実施例２と同様
にして厚さ８０μｍのポリサルホン樹脂フィルムを作製
した。得られた未延伸のポリサルホン樹脂フィルムの、
故意に塗工スジが発生するようにＰＥＴフィルムのリボ
ンを巻き付けた部分に相当する部位の膜厚は、８０±２
μｍであり、外観的には左程目立った塗工スジにはなっ
ていないが、数字が示す如くバラツキは大きくなってい
た。更に、１．４倍に一軸延伸処理された位相差補償フ
ィルムは、実施例１と同様に前記故意に塗工スジが発生
するようにした部位を観察したところ、位相差補償フィ
ルム全体に光学的なムラが明確に視認された。(Comparative Example 3) In the same manner as in Example 2 except that the wind velocity in the normal direction to the cast surface of the hot air in the dryer of Example 2 was changed from 4.3 m / sec to 1.8 m / sec. A polysulfone resin film having a thickness of 80 μm was produced. Of the unstretched polysulfone resin film obtained,
The film thickness of the portion corresponding to the portion of the PET film around which the ribbon is wound is 80 ± 2 so that a coating stripe is intentionally generated.
Although the coating streak was not as noticeable on the left as it looks, the variation was large as indicated by the numbers. Further, in the retardation compensation film which was uniaxially stretched to 1.4 times, the portion where the coating stripe was intentionally generated was observed in the same manner as in Example 1, and it was found that the retardation compensation film was found to have an optical property. The unevenness was clearly visible.
【００３５】（比較例４）実施例３の乾燥機における熱
風のキャスト面に対する法線方向の風速を６．０ｍ／秒
から２．２ｍ／秒に変更したこと以外、実施例３と同様
にして厚さ８０μｍのポリサルホン樹脂フィルムを作製
した。得られた未延伸のポリサルホン樹脂フィルムの、
故意に塗工スジが発生するようにＰＥＴフィルムのリボ
ンを巻き付けた部分に相当する部位の膜厚は、７３μｍ
と薄く、塗工スジが認められ、更に、１．４倍に一軸延
伸処理された位相差補償フィルムは、実施例１と同様に
前記故意に塗工スジが発生するようにした部位を観察し
たところ、位相差補償フィルムの塗工スジが光学的なム
ラとして明確に視認された。(Comparative Example 4) In the same manner as in Example 3 except that the wind speed in the normal direction to the cast surface of the hot air in the dryer of Example 3 was changed from 6.0 m / sec to 2.2 m / sec. A polysulfone resin film having a thickness of 80 μm was produced. Of the unstretched polysulfone resin film obtained,
The film thickness of the portion corresponding to the portion of the PET film around which the ribbon is wound so that coating stripes are intentionally generated is 73 μm.
In the same manner as in Example 1, the retardation compensation film that was uniaxially stretched by 1.4 times was observed to have the coating stripes intentionally generated as described above. However, coating streaks on the retardation compensation film were clearly visible as optical unevenness.
【００３６】（比較例５）実施例３の乾燥機における熱
風のキャスト面に対する法線方向の風速を６．０ｍ／秒
から７．０ｍ／秒に変更したこと以外、実施例３と同様
にして厚さ８０μｍのポリサルホン樹脂フィルムを作製
した。得られた未延伸のポリサルホン樹脂フィルムの、
故意に塗工スジが発生するようにＰＥＴフィルムのリボ
ンを巻き付けた部分に相当する部位の膜厚は、８０±２
μｍであり、外観的には左程目立った塗工スジにはなっ
ていないが、数字が示す如くバラツキは大きくなってい
た。更に、１．４倍に一軸延伸処理された位相差補償フ
ィルムは、実施例１と同様に前記故意に塗工スジが発生
するようにした部位を観察したところ、位相差補償フィ
ルム全体に光学的なムラが明確に視認された。(Comparative Example 5) In the same manner as in Example 3 except that the wind speed in the normal direction to the cast surface of the hot air in the dryer of Example 3 was changed from 6.0 m / sec to 7.0 m / sec. A polysulfone resin film having a thickness of 80 μm was produced. Of the unstretched polysulfone resin film obtained,
The film thickness of the portion corresponding to the portion of the PET film around which the ribbon is wound is 80 ± 2 so that a coating stripe is intentionally generated.
Although the coating streak was not as noticeable on the left as it looks, the variation was large as indicated by the numbers. Further, in the retardation compensation film which was uniaxially stretched to 1.4 times, the portion where the coating stripe was intentionally generated was observed in the same manner as in Example 1, and it was found that the retardation compensation film was found to have an optical property. The unevenness was clearly visible.
【００３７】上記実施例及び比較例の光学用透明フィル
ムの製造方法の各要因及び得られたポリサルホン樹脂フ
ィルム及び位相差補償フィルムの上記性能を取り纏め、
表１に示した。The factors of the method for producing the optical transparent film of the above Examples and Comparative Examples and the above performances of the obtained polysulfone resin film and retardation compensation film are summarized.
The results are shown in Table 1.
【００３８】[0038]
【表１】 [Table 1]
【００３９】[0039]
【発明の効果】本発明の光学用透明フィルムの製造方法
は、叙上の如く構成されているので、厚さの均一性が高
く、光学的に歪みの極めて少ない透明フィルムを製造す
ることが可能となり、液晶表示素子等の視覚装置に使用
される高品質の光学用透明フィルムを提供することがで
きる。EFFECT OF THE INVENTION Since the method for producing an optical transparent film of the present invention is constructed as described above, it is possible to produce a transparent film having a high thickness uniformity and an extremely small optical distortion. Therefore, it is possible to provide a high-quality optical transparent film used for a visual device such as a liquid crystal display device.
Claims (1)
１０poise 以上である溶液キャスト製膜において、乾燥
工程における溶液キャスト面の法線方向の風速Ｖ（ｍ／
秒）が下式に示される範囲にあることを特徴とする光学
用透明フィルムの製造方法。 【化１】 1. A solution cast film having a solution viscosity (η) at the liquid temperature during drying of 10 poise or more, in the drying step, the wind velocity V (m / m) in the direction normal to the solution cast surface.
Sec) is in the range represented by the following formula: A method for producing an optical transparent film. Embedded image
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20439095A JPH0952240A (en) | 1995-08-10 | 1995-08-10 | Production of optical transparent film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20439095A JPH0952240A (en) | 1995-08-10 | 1995-08-10 | Production of optical transparent film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0952240A true JPH0952240A (en) | 1997-02-25 |
Family
ID=16489752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20439095A Pending JPH0952240A (en) | 1995-08-10 | 1995-08-10 | Production of optical transparent film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0952240A (en) |
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