JPH06279598A - Heat-resistant transparent film and production thereof - Google Patents
Heat-resistant transparent film and production thereofInfo
- Publication number
- JPH06279598A JPH06279598A JP9539293A JP9539293A JPH06279598A JP H06279598 A JPH06279598 A JP H06279598A JP 9539293 A JP9539293 A JP 9539293A JP 9539293 A JP9539293 A JP 9539293A JP H06279598 A JPH06279598 A JP H06279598A
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- film
- thickness
- heat
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- polymer
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、主鎖に芳香族基を有す
るポリマーからなり、光学用途に適性のある、厚み精度
に優れた耐熱透明フィルム及びその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-resistant transparent film which is made of a polymer having an aromatic group in its main chain and which is suitable for optical use and has excellent thickness accuracy, and a method for producing the same.
【０００２】[0002]
【従来の技術】エレクトロニクス技術の急速な進歩にと
もない、液晶表示素子を中心として、大面積の、いわゆ
るジャイアントマイクロエレクトロニクスと呼ばれる分
野が急速に拡大し、容易に大面積化が可能であるという
特徴を生かして、偏光フィルム、位相差フィルム、透明
導電フィルム等、高分子フィルムの光学的用途の拡大が
めざましい。これら用途に使用される高分子材料は、機
器に組み込まれた場合の耐熱性あるいは、耐湿性等、長
期信頼性の観点から選択され、ポリエステルやポリカー
ボネート、ポリスルフォン、ポリエーテルスルフォン
等、広く一般に知られている耐熱性のある高分子素材が
利用されている。しかし、これら材料からなるフィルム
は溶融押し出し法により成膜されているため、ダイライ
ン等の欠陥が必然的に生じ、また、分子配向による光学
的異方性がでやすい他、フィルム厚みに対する成膜精度
が大きいという欠点を有している。2. Description of the Related Art With the rapid progress of electronics technology, a large area called so-called giant microelectronics has been rapidly expanded centering on liquid crystal display devices, and it is possible to easily increase the area. Taking advantage of this, the expansion of optical applications of polymer films such as polarizing films, retardation films and transparent conductive films is remarkable. Polymer materials used for these purposes are selected from the viewpoint of long-term reliability such as heat resistance or humidity resistance when incorporated in equipment, and are widely known to polyester, polycarbonate, polysulfone, polyether sulfone, etc. The heat-resistant polymer material is used. However, since films made of these materials are formed by the melt extrusion method, defects such as die lines inevitably occur, and optical anisotropy due to molecular orientation is likely to occur, and film formation accuracy with respect to the film thickness. Has the drawback of being large.
【０００３】一方、光学的用途に用いられる場合、フィ
ルムとしての光学的性質は、フィルム自体の性質の他、
その厚みが大きく影響するため、単にフィルムの透明性
のみでなく、厚みの均一さにたいする要求が厳しさを増
している。従って、当初、溶融押し出し法により供給さ
れていたフィルムも、光学的異方性の少ないフィルムを
得易いという特徴の他、厚みのばらつきを低く抑えるこ
とができるという特徴から、溶融キャスティング方法に
より成膜されたフィルムに置き換えられつつある。高耐
熱性を有する高分子素材を用いる場合、素材の熱劣化の
点からも溶剤キャスティング法は好ましく、ポリアリレ
ート等ガラス転移点が１８０℃以上を有するポリマーも
好適に利用可能となる。On the other hand, when used for optical purposes, the optical properties of the film include the properties of the film itself,
Since the thickness has a great influence, the demands for not only the transparency of the film but also the uniformity of the thickness are becoming more severe. Therefore, the film that was initially supplied by the melt extrusion method has the characteristics that it is easy to obtain a film with little optical anisotropy and that the variation in thickness can be suppressed to a low level. Is being replaced by the film When a polymer material having high heat resistance is used, the solvent casting method is preferable also from the viewpoint of heat deterioration of the material, and a polymer having a glass transition point of 180 ° C. or higher such as polyarylate can be suitably used.
【０００４】また、近年、超捻れツィストネマチック
（ＳＴＮ）型液晶を用いた大型の表示素子が注目され、
パソコンやワープロの表示素子として広く利用されてい
る。該表示素子の複屈折性に基づく好ましくない着色を
補正するため、位相差板の利用が普及し、特に、高分子
フィルムが広く用いられている。該高分子フィルムは、
溶剤キャスト法により成膜された光学的に等方性の高分
子フィルムを一軸に延伸して得られる、複屈折性を有す
る透明フィルムであり、液晶素子での位相差を補償する
役割を果たす。しかし、要求される表示品位が高くなる
につれ、フィルムの複屈折の微小なムラやフィルムの微
小な厚みムラに起因する位相差の面内ばらつきが原因と
なり、補償性能にムラができ、これが、液晶表示素子の
画像品位を低下させることが指摘され、位相差ムラのよ
り改善された位相差フィルムが要求されている。Further, in recent years, a large-sized display element using a super twisted twisted nematic (STN) type liquid crystal has attracted attention,
Widely used as a display element for personal computers and word processors. In order to correct undesired coloring due to the birefringence of the display element, the use of a retardation plate has spread, and in particular, a polymer film has been widely used. The polymer film is
It is a transparent film having birefringence obtained by uniaxially stretching an optically isotropic polymer film formed by a solvent casting method, and plays a role of compensating for retardation in a liquid crystal element. However, as the required display quality becomes higher, in-plane dispersion of the retardation due to minute unevenness of birefringence of the film and minute unevenness of the thickness of the film causes unevenness in the compensation performance. It has been pointed out that the image quality of the display element is deteriorated, and a retardation film with more improved retardation unevenness is required.
【０００５】[0005]
【発明が解決しようとする課題】しかし、光学的用途の
供される耐熱高分子からなるキャスティングフィルムの
場合、キャスティング方法・条件にも依存するが、隣接
する山谷間の平均高さ（近傍の厚み変化）が、フィルム
平均厚みに対して１％前後が限界である。一方、光学的
特性から要求される厚み精度は更に高度な精度が要求さ
れており、充分なレベルには到っていないのが現状であ
る。また、特に、カラー化に伴う高度な位相差ムラ低減
要求に対し、未だ充分満足される位相差フィルムは提供
されていないのが現状である。本発明は、厚み精度に優
れた耐熱透明フィルム及び位相差ムラを改善した位相差
フィルムの製造方法を提供するものである。However, in the case of a casting film made of a heat-resistant polymer for optical use, the average height between adjacent peaks and valleys (thickness in the vicinity depends on the casting method and conditions). Change) is about 1% of the average film thickness. On the other hand, the thickness accuracy required from the optical characteristics is required to be higher, and it is the current situation that it has not reached a sufficient level. Further, in particular, at present, a retardation film which is sufficiently satisfied with respect to a high demand for reduction of retardation unevenness due to colorization has not been provided. The present invention provides a heat-resistant transparent film having excellent thickness accuracy and a method for producing a retardation film having improved retardation unevenness.
【０００６】[0006]
【課題を解決するための手段】本発明者らは前記実状に
鑑み前記目的を達成すべく鋭意検討を重ねた結果、キャ
スティング用のドープ中に表面調整剤をあらかじめ添加
しておくことにより、厚み精度を大幅に改善されたフィ
ルムを得られることを見いだし、本発明に到達した。す
なわち、本発明の第１は、主鎖に芳香族基を有するポリ
マーからなる厚さ２００μｍ以下のフィルムであって、
その近傍の厚み変化がフィルムの平均厚みの０．５％以
下であることを特徴とする耐熱透明フィルムを、本発明
の第２は、主鎖に芳香族基を有するポリマーからなる耐
熱透明フィルムを溶液キャスティング法により成膜する
に際し、キャスティング用のドープ中に表面調整剤を添
加することを特徴とする耐熱透明フィルムの製造方法
を、本発明の第３は、上記で得られた耐熱透明フィルム
を一軸延伸することを特徴とする位相差フィルムの製造
方法をそれぞれ内容とする。Means for Solving the Problems The inventors of the present invention have conducted extensive studies in order to achieve the above-mentioned object in view of the above-mentioned circumstances, and as a result, by adding a surface conditioner in a dope for casting in advance, The inventors have found that a film with greatly improved accuracy can be obtained, and arrived at the present invention. That is, the first aspect of the present invention is a film having a thickness of 200 μm or less, which is made of a polymer having an aromatic group in the main chain,
A second aspect of the present invention is a heat-resistant transparent film comprising a polymer having an aromatic group in its main chain, wherein the thickness change in the vicinity thereof is 0.5% or less of the average thickness of the film. A method for producing a heat-resistant transparent film, which comprises adding a surface modifier to a dope for casting when forming a film by a solution casting method, and the third of the present invention is to provide the heat-resistant transparent film obtained above. The content of each is a method for producing a retardation film, which is characterized by uniaxially stretching.
【０００７】本発明に用いられる高分子素材は、ポリカ
ーボネート、ポリアリレート、ポリエステル、ポリスル
フォン、ポリエーテルスルフォン等、主鎖に芳香族基を
有する実質的にアモルファスな耐熱高分子である。ま
た、相溶性の大きい該高分子素材間のブレンド体または
アロイであってもかまわない。The polymer material used in the present invention is a substantially amorphous heat-resistant polymer having an aromatic group in the main chain, such as polycarbonate, polyarylate, polyester, polysulfone, and polyethersulfone. Further, it may be a blend or alloy of the polymer materials having high compatibility.
【０００８】特に下記一般式In particular, the following general formula
【０００９】[0009]
【化１】 [Chemical 1]
【００１０】（式中、Ｘは炭素数１〜１０の置換或いは
無置換の２価炭化水素基、Ｒ1 、Ｒ2は、炭素数１〜２
０のアルキル、アリル、アラルキル、アルコキシル、ア
リロキシル及びアリルアルコキシル基、その置換体、ハ
ロゲン及びそれらの混合物から選ばれる１価の基、ｐ、
ｑはｐ＋ｑ＝１〜８の整数、ｍ、ｎ、ｒ、ｓは０又は
１、但しｍ＝１のときｎ≠０、ｒ＝１のときｓ≠０、且
つ（Ｉ）と（II）のモル比は（Ｉ）／（Ｉ）＋（II）＝
１〜０である）で表されるポリアリレートが好適であ
る。その詳細は、特開昭５０−１３４９１号等に記載さ
れている。(In the formula, X is a substituted or unsubstituted divalent hydrocarbon group having 1 to 10 carbon atoms, and R 1 and R 2 are 1 to 2 carbon atoms.
A monovalent group selected from the group consisting of 0, alkyl, allyl, aralkyl, alkoxyl, aryloxyl and allylalkoxyl groups, substituents thereof, halogen and mixtures thereof, p,
q is an integer of p + q = 1 to 8, m, n, r, and s are 0 or 1, provided that n ≠ 0 when m = 1, s ≠ 0 when r = 1, and (I) and (II) The molar ratio is (I) / (I) + (II) =
Polyarylate represented by 1 to 0) is preferable. The details are described in JP-A No. 50-13491.
【００１１】本発明に用いられる溶剤としては、高分子
素材及び表面調整剤が均一に溶解するものであれば無限
無く用いることができる。一般的には、アセトン等のケ
トン類、エチルアセテート等のエステル類、トリクロロ
メタン、ジクロロメタン等のハロゲン化オレフィン類、
ジメチルアセトアミド、ジメチルフォルムアミド等のア
ミド類が用いられる。また、溶剤は複数の混合溶剤を用
いてもよい。キャスティング用ドープは、乾燥時の熱安
定性を増すため安定剤の添加を必要とする場合があるほ
か、セルロースアセテート等の溶剤キャスティング法で
採用されているように、フタル酸エステル、燐酸エステ
ルやグリコールのエステル等の可塑剤を含んでいてもよ
い。The solvent used in the present invention can be used indefinitely as long as the polymer material and the surface conditioner are uniformly dissolved therein. Generally, ketones such as acetone, esters such as ethyl acetate, halogenated olefins such as trichloromethane and dichloromethane,
Amides such as dimethylacetamide and dimethylformamide are used. Further, a plurality of mixed solvents may be used as the solvent. Casting dope may require the addition of stabilizers to increase the thermal stability during drying, and as used in solvent casting methods such as cellulose acetate, phthalates, phosphates and glycols may be used. It may contain a plasticizer such as ester.
【００１２】本発明において高分子素材を溶剤に溶解し
て得られるドープに表面調整剤を存在させることが必要
である。表面調整剤は、各種塗工剤を塗工する際、塗工
表面の調節用に広く用いられており、アクリル系、フッ
ソ系、シリコン系の表面調整剤の他、オレフィン系界面
活性剤がその目的に応じ用いられている。厚み精度の改
良効果の他、ドープや得られたフィルムに対する分散性
等の観点から、表面調整剤はシリコン系の化合物が好ま
しく、ジメチルポリシロキサン骨格を有する化合物がよ
り好ましく、ポリエステル残基により変性されたポリジ
メチルシロキサン系表面調整剤が特に有効である。ポリ
エステル残基は、ベンゼン環等の芳香族残基や水酸基や
カルボキシル基などの極性基を保有していてもかまわな
い。代表的なポリジメチルシロキサン系表面調整剤の一
般式を下記に示す。In the present invention, it is necessary to allow the surface modifier to be present in the dope obtained by dissolving the polymer material in the solvent. Surface modifiers are widely used for adjusting the coating surface when applying various coating agents.Acrylic, fluorine, and silicon surface modifiers are used as well as olefinic surfactants. It is used according to the purpose. In addition to the effect of improving the thickness accuracy, from the viewpoint of dope and dispersibility in the obtained film, the surface modifier is preferably a silicon compound, more preferably a compound having a dimethylpolysiloxane skeleton, and modified with a polyester residue. The polydimethylsiloxane-based surface conditioner is particularly effective. The polyester residue may have an aromatic residue such as a benzene ring or a polar group such as a hydroxyl group or a carboxyl group. The general formulas of typical polydimethylsiloxane surface conditioners are shown below.
【００１３】[0013]
【化２】 [Chemical 2]
【００１４】但し、Ｒ3 ＝−Ｒ4 −Ｏ−ＣＯ−Ｒ5 −Ｃ
Ｏ−Ｏ−Ｒ6 −Ｏ−Ｒ7 −Ｙであり、Ｒ4 、Ｒ5 、
Ｒ6 、Ｒ7 は置換または非置換のアルキル基、アリル
基、アラルキル基から選択され、Ｙは水素または水酸
基、カルボキシル基、アミノ基等の極性基から選択され
る。Ｖ、Ｗはそれぞれ０〜１００までの整数で、同時に
０となることはない。該表面調整剤を用いた場合、特に
ポリカーボネート及びポリアリレートのフィルムに対し
て顕著な改善効果が得られる。該表面調整剤の過小な使
用は厚み精度を改善せず、一方、過大な使用は用いる溶
剤によりドープの白濁を招くほか、得られるフィルムの
ヘーズを低下させる。一般的には高分子素材１００重量
部に対して０．１〜５重量部の範囲から選択されるが、
表面調整剤はドープ流延直後の表面に存在すればよく、
該表面調整剤の飽和表面吸着量付近で用いるのが好まし
い。ドープへ添加する表面調整剤は単独または複数組み
合わせたものでも、溶剤を含んでいてもかまわない。However, R 3 = -R 4 -O-CO-R 5 -C
O—O—R 6 —O—R 7 —Y, and R 4 , R 5 ,
R 6 and R 7 are selected from a substituted or unsubstituted alkyl group, an allyl group and an aralkyl group, and Y is selected from hydrogen or a polar group such as a hydroxyl group, a carboxyl group and an amino group. V and W are each an integer from 0 to 100 and never become 0 at the same time. When the surface modifier is used, a remarkable improving effect is obtained particularly for a film of polycarbonate and polyarylate. Excessive use of the surface conditioner does not improve the thickness accuracy, while excessive use causes cloudiness of the dope depending on the solvent used and also reduces the haze of the obtained film. Generally, it is selected from the range of 0.1 to 5 parts by weight with respect to 100 parts by weight of the polymer material,
The surface modifier may be present on the surface immediately after the dope casting,
It is preferably used near the saturated surface adsorption amount of the surface modifier. The surface conditioner added to the dope may be used alone or in combination of two or more, or may contain a solvent.
【００１５】厚み精度を良好に保つためには、用いる機
器に応じたキャスティング条件の最適化も重要であり、
ドープの濃度や粘度、ラインスピード等は、素材の種類
及び分子量に応じ最適な値が決定される。工業的溶剤キ
ャスティング法としては、エンドレスベルトやドラム式
成膜装置への流延等、公知の方法が適用できる。流延さ
れ、自己支持性ができる迄乾燥されたフィルムは剥離さ
れ、残存溶剤の完全な乾燥と光学的特性の微調整を目的
として、ガラス転移近傍にて後乾燥される。In order to maintain good thickness accuracy, it is important to optimize the casting conditions according to the equipment used.
Optimum values for the dope concentration, viscosity, line speed, etc. are determined according to the type and molecular weight of the material. As the industrial solvent casting method, a known method such as casting on an endless belt or a drum type film forming apparatus can be applied. The film that has been cast and dried until it is self-supporting is peeled off and post-dried in the vicinity of the glass transition for the purpose of completely drying the residual solvent and finely adjusting the optical properties.
【００１６】本発明の耐熱透明フィルムは、その平均厚
みは２０〜２００μｍが好ましく、より好ましくは４０
〜１２０μｍである。最適厚みは用いられる用途により
決定される。また、本発明の耐熱透明フィルムは、必要
に応じ粘着加工やハードコート加工等、一般的なフィル
ム二次加工を行うことが可能である。特に、熱延伸によ
り光学的異方性をもたせ位相差フィルムとして用いる場
合に、本発明フィルムの有する厚み精度は延伸後の複屈
折ムラを改善することになり極めて有用である。すなわ
ち、複屈折のムラは、位相差フィルムとして用いた場合
の色ムラとなって現れるが、特に隣接部分での急激な複
屈折ムラが視認性が高く問題となる。本発明の耐熱透明
フィルムは、特に近傍での厚みムラが改善されているた
め、位相差フィルムとした場合の色ムラ改善効果は極め
て大である。The heat-resistant transparent film of the present invention preferably has an average thickness of 20 to 200 μm, more preferably 40.
Is about 120 μm. The optimum thickness is determined by the application used. Further, the heat-resistant transparent film of the present invention can be subjected to general film secondary processing such as adhesion processing and hard coating processing, if necessary. In particular, when the film of the present invention is used as a retardation film having optical anisotropy by thermal stretching, the thickness accuracy of the film of the present invention improves birefringence unevenness after stretching and is extremely useful. That is, the birefringence unevenness appears as color unevenness when it is used as a retardation film, but a sharp birefringence unevenness particularly in an adjacent portion has a high visibility and becomes a problem. Since the heat-resistant transparent film of the present invention has improved thickness unevenness particularly in the vicinity thereof, the effect of improving color unevenness when used as a retardation film is extremely large.
【００１７】[0017]
【実施例】以下、本発明を実施例を挙げて更に詳細に説
明するが、本発明はこれらに限定されるものではない。
なお、実施例中のフィルム厚みと厚み精度を表す「近傍
厚みの変化」は、触針式連続フィルム厚み計の測定信号
をコンピューターに取り込み解析した。また、「近傍厚
みの変化」は、測定した厚みパターンを基に、０．０４
μｍ以上の高低差を有する凸凹を対象とし、隣接する山
谷間の平均高さで表した。The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto.
The “change in thickness in the vicinity”, which represents the film thickness and thickness accuracy in the examples, was analyzed by loading a measurement signal of a stylus-type continuous film thickness meter into a computer. The “change in thickness in the vicinity” is 0.04 based on the measured thickness pattern.
Targeted at irregularities having a height difference of not less than μm, the average height between adjacent peaks and valleys was used.
【００１８】実施例１ ビスフェノールＡとテレフタル酸及びイソフタル酸の共
縮合物からなるポリアリレート（分子量約５万）１００
重量部と燐酸系熱安定剤を０．０１重量部溶解した２０
重量％のジクロロメタン溶液からなるドープに、表面調
整剤としてポリエステル変性ジメチルポリシロキサン溶
液を２重量部添加し、溶剤キャスティング法にて、幅
１．５ｍの透明フィルムを得た。得られた透明フィルム
の平均厚みは６５μｍであった。このフィルムの近傍厚
みの変化は０．２２μｍであり、これは平均厚みの０．
３０％に相当するものであった。Example 1 Polyarylate (molecular weight of about 50,000) 100 consisting of a cocondensation product of bisphenol A with terephthalic acid and isophthalic acid
20 parts by weight and 0.01 parts by weight of a phosphoric acid heat stabilizer were dissolved.
2 parts by weight of a polyester-modified dimethylpolysiloxane solution as a surface conditioner was added to a dope composed of a wt% dichloromethane solution, and a transparent film having a width of 1.5 m was obtained by a solvent casting method. The average thickness of the obtained transparent film was 65 μm. The change in thickness in the vicinity of this film was 0.22 μm, which is an average thickness of 0.
It was equivalent to 30%.
【００１９】比較例１ 表面調整剤を添加しない他は実施例１と同様にして透明
フィルムを得た。この透明フィルムの平均厚みは６７μ
ｍで、近傍厚み変化は０．６０μｍであり、平均厚みの
０．９０％に相当した。Comparative Example 1 A transparent film was obtained in the same manner as in Example 1 except that the surface modifier was not added. The average thickness of this transparent film is 67μ
In m, the change in thickness in the vicinity was 0.60 μm, which corresponds to 0.90% of the average thickness.
【００２０】実施例２ 実施例１と同様にして、平均厚み７７μｍの透明フィル
ムを得た。このフィルムの近傍厚み変化は０．３６μｍ
であり、平均厚みの０．４７％であった。Example 2 A transparent film having an average thickness of 77 μm was obtained in the same manner as in Example 1. The thickness change in the vicinity of this film is 0.36 μm
And was 0.47% of the average thickness.
【００２１】比較例２ 表面調整剤を添加しない他は実施例２と同様にして透明
フィルムを得た。この透明フィルムの平均厚みは７５μ
ｍで、近傍厚み変化は０．８２μｍであり、平均厚みの
１．１０％であった。Comparative Example 2 A transparent film was obtained in the same manner as in Example 2 except that the surface modifier was not added. The average thickness of this transparent film is 75μ
In m, the change in thickness in the vicinity was 0.82 μm, which was 1.10% of the average thickness.
【００２２】実施例３ ビスフェノールＡとテレフタル酸クロライドの縮合物か
らなるポリカーボネート（分子量約５万）１００重量部
を溶解した２０重量％のジクロロメタン溶液からなるド
ープに、表面調整剤としてポリエステル変性ジメチルポ
リシロキサン溶液を２重量部添加し、溶剤キャスティン
グ法にて、幅１．５ｍの透明フィルムを得た。得られた
透明フィルムの平均厚みは７０μｍであった。このフィ
ルムの近傍厚みの変化は０．１６μｍであり、これは、
平均厚みの０．２０％に相当するものであった。Example 3 A dope made of a 20% by weight dichloromethane solution in which 100 parts by weight of a polycarbonate (molecular weight of about 50,000) made of a condensate of bisphenol A and terephthalic acid chloride was dissolved, and a polyester-modified dimethylpolysiloxane was used as a surface conditioner. 2 parts by weight of the solution was added and a transparent film having a width of 1.5 m was obtained by a solvent casting method. The average thickness of the obtained transparent film was 70 μm. The change in thickness in the vicinity of this film is 0.16 μm, which is
It was equivalent to 0.20% of the average thickness.
【００２３】比較例３ 表面調整剤を添加しない他は実施例３と同様にして透明
フィルムを得た。この透明フィルムの平均厚みは６８μ
ｍで、近傍厚み変化は０．２７μｍであり、平均厚みの
０．５３％に相当した。Comparative Example 3 A transparent film was obtained in the same manner as in Example 3 except that the surface modifier was not added. The average thickness of this transparent film is 68μ
In m, the change in thickness in the vicinity was 0.27 μm, which corresponds to 0.53% of the average thickness.
【００２４】実施例４ 実施例２で得られたフィルムを熱延伸により、５７０nm
の複屈折を有する位相差フィルムを得た。これを偏光フ
ィルムではさみ色ムラを観察したが、色ムラを観察する
ことができなかった。Example 4 The film obtained in Example 2 was heat-stretched to 570 nm.
A retardation film having a birefringence of was obtained. This was observed with a polarizing film for scissors color unevenness, but color unevenness could not be observed.
【００２５】比較例４ 比較例２で得られたフィルムを用いた他は実施例４と同
様にして位相差フィルムを得、色ムラを観察したが、延
伸方向に色ムラが認められた。Comparative Example 4 A retardation film was obtained in the same manner as in Example 4 except that the film obtained in Comparative Example 2 was used, and color unevenness was observed, but color unevenness was observed in the stretching direction.
【００２６】[0026]
【発明の効果】本発明の耐熱透明フィルムは、０．０４
μｍ以上の高低差を有する凹凸を対照とした隣接する山
谷間の平均高さ、すなわち近傍厚み変化が平均膜厚の
０．５％以下であり、更には０．４％以下とすることも
可能である。以上のように本発明によれば、厚み精度の
優れた光学用耐熱透明フィルムが得られ、例えば位相差
ムラの改善された位相差フィルムが提供される。The heat-resistant transparent film of the present invention is 0.04
The average height between adjacent ridges and valleys, that is, the change in the thickness in the vicinity is 0.5% or less of the average film thickness, and can be 0.4% or less. Is. As described above, according to the present invention, a heat-resistant transparent film for optics having excellent thickness accuracy can be obtained, and for example, a retardation film with improved unevenness of retardation is provided.
フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｌ 7:00 4Ｆ Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI Technical display area B29L 7:00 4F
Claims (6)
る厚さ２００μｍ以下のフィルムであって、その近傍の
厚み変化がフィルムの平均厚みの０．５％以下であるこ
とを特徴とする耐熱透明フィルム。1. A heat-resistant film comprising a polymer having an aromatic group in the main chain and having a thickness of 200 μm or less, wherein the thickness change in the vicinity thereof is 0.5% or less of the average thickness of the film. Transparent film.
アリレートである請求項１記載の耐熱透明フィルム。2. The heat-resistant transparent film according to claim 1, wherein the polymer having an aromatic group in its main chain is polyarylate.
る耐熱透明フィルムを溶液キャスティング法により成膜
するに際し、キャスティング用のドープ中に表面調整剤
を添加することを特徴とする耐熱透明フィルムの製造方
法。3. A heat-resistant transparent film, characterized in that, when a heat-resistant transparent film made of a polymer having an aromatic group in its main chain is formed by a solution casting method, a surface modifier is added to a dope for casting. Production method.
求項３記載の製造方法。4. The method according to claim 3, wherein the surface modifier is a silicon compound.
たポリシロキサン系化合物である請求項４記載の製造方
法。5. The method according to claim 4, wherein the silicon compound is a polyester-modified polysiloxane compound.
ムを一軸延伸することを特徴とする位相差フィルムの製
造方法。6. A method for producing a retardation film, which comprises uniaxially stretching the heat-resistant transparent film obtained in any one of claims 3 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9539293A JP3370383B2 (en) | 1993-03-29 | 1993-03-29 | Heat-resistant transparent film and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9539293A JP3370383B2 (en) | 1993-03-29 | 1993-03-29 | Heat-resistant transparent film and method for producing the same |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002061943A Division JP2002275290A (en) | 2002-03-07 | 2002-03-07 | Heat-resistant transparent film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06279598A true JPH06279598A (en) | 1994-10-04 |
| JP3370383B2 JP3370383B2 (en) | 2003-01-27 |
Family
ID=14136381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9539293A Expired - Fee Related JP3370383B2 (en) | 1993-03-29 | 1993-03-29 | Heat-resistant transparent film and method for producing the same |
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| Country | Link |
|---|---|
| JP (1) | JP3370383B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120183697A1 (en) * | 2011-01-17 | 2012-07-19 | Sumitomo Chemical Company, Limited | Liquid crystal polyester-containing liquid composition |
-
1993
- 1993-03-29 JP JP9539293A patent/JP3370383B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120183697A1 (en) * | 2011-01-17 | 2012-07-19 | Sumitomo Chemical Company, Limited | Liquid crystal polyester-containing liquid composition |
| JP2012149127A (en) * | 2011-01-17 | 2012-08-09 | Sumitomo Chemical Co Ltd | Liquid crystal polyester-containing liquid composition |
| US9469761B2 (en) | 2011-01-17 | 2016-10-18 | Sumitomo Chemical Company, Limited | Liquid crystal polyester-containing liquid composition |
| TWI567132B (en) * | 2011-01-17 | 2017-01-21 | 住友化學股份有限公司 | Liquid crystal polyester-containing liquid composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3370383B2 (en) | 2003-01-27 |
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