JP3370383B2 - Heat-resistant transparent film and method for producing the same - Google Patents
Heat-resistant transparent film and method for producing the sameInfo
- Publication number
- JP3370383B2 JP3370383B2 JP9539293A JP9539293A JP3370383B2 JP 3370383 B2 JP3370383 B2 JP 3370383B2 JP 9539293 A JP9539293 A JP 9539293A JP 9539293 A JP9539293 A JP 9539293A JP 3370383 B2 JP3370383 B2 JP 3370383B2
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- film
- heat
- group
- transparent film
- thickness
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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
るアモルファスなポリマーからなり、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の製造方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a heat-resistant transparent film which is made of an amorphous polymer having an aromatic group in its main chain and which is suitable for optical use and has excellent thickness accuracy.
【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、溶液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、光学的用途に
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、未だ充分満足し得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の製造方法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 ridges 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. In addition, in particular, at present, there is no retardation film which can sufficiently satisfy the demand for reducing the retardation unevenness due to colorization. The present invention provides a method for producing 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、アモ
ルファスなポリマーからなるキャスティング用のドープ
中にシリコン系化合物からなる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
光学用耐熱透明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
香族基を有するアモルファスな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シリコン系化合物か
らなる表面調整剤を添加することを特徴とする光学用耐
熱透明フィルム(但し、電子写真感光体用フィルムを除
く)の製造方法を、本発明の第2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。尚、本発明
において、「近傍の厚み変化」とは、0.04μm以上
の高低差を有する山谷(凸凹)を対象とし、隣接する山
谷間の平均高さを指す。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, a surface conditioner comprising a silicon compound in a dope for casting comprising an amorphous polymer. It was found that the heat-resistant transparent film for optics having a significantly improved thickness accuracy can be obtained by adding in advance. That is, the first aspect of the present invention is that when a heat-resistant transparent film made of an amorphous polymer having an aromatic group in its main chain is formed by a solution casting method, a surface conditioner made of a silicon compound is added to a dope for casting. A second method of the present invention is to uniaxially stretch the heat-resistant transparent film obtained above, which is characterized by adding a heat-resistant transparent film for optics (excluding the film for electrophotographic photoreceptors). The content of each of the methods of producing the characteristic retardation film is described. In the present invention, the “change in thickness in the vicinity” refers to peaks and valleys (concavities and convexities) having a height difference of 0.04 μm or more, and refers to the average height between adjacent peaks and valleys.
【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2】 [Chemical 2]
【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制限
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。As the solvent used in the present invention, any solvent can be used without limitation as long as it can uniformly dissolve the polymer material and the surface conditioner. 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3】 [Chemical 3]
【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レン基、アリー
レン基、アラアルキレン基から選択され、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は0〜100、Wは1〜100までの整数
である。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 substituted or unsubstituted alkylene groups, arylene groups and araalkylene groups, and Y is selected from hydrogen or polar groups such as hydroxyl groups, carboxyl groups and amino groups. V is an integer of 0 to 100 and W is an integer of 1 to 100. 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, but the surface conditioner may be present on the surface immediately after the casting of the dope and the saturation of the surface conditioner. It is preferably used near the surface adsorption amount. 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、ガラス転移点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 cast and dried until it is self-supporting is peeled off and post-dried in the vicinity of the glass transition point in order to completely dry the residual solvent and finely adjust the optical properties.
【0016】本発明の製造方法で得られる光学用耐熱透
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、該フィル
ムの厚みパターンの、隣接する山谷間の平均高さ(近傍
の厚さ変化)は、該フィルムの平均厚みの0.5%以下
であることが好ましい。また、本発明の製造方法で得ら
れる光学用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、本発明の製
造方法で得られる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。本発明の製造
方法で得られる光学用耐熱透明フィルムは、厚みパター
ンの、隣接する山谷間の平均高さ(近傍の厚み変化)が
特に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 for optics obtained by the production method of the present invention has an average thickness of preferably 20 to 200 μm, more preferably 40 to 120 μm. The optimum thickness is determined by the application used. Further, the average height (change in thickness in the vicinity) between adjacent peaks and valleys of the thickness pattern of the film is preferably 0.5% or less of the average thickness of the film. The heat-resistant transparent film for optics obtained by the production method 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 used as a retardation film having optical anisotropy by heat drawing, the thickness accuracy of the film obtained by the production method of the present invention is extremely useful because it improves birefringence unevenness after drawing. . 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. The heat-resistant transparent film for optics obtained by the production method of the present invention has a particularly improved average height between adjacent ridges and valleys (change in thickness in the vicinity) of the thickness pattern. The improvement effect 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
の厚み変化」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、「近傍の
厚み変化」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山谷(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 the thickness accuracy in the examples, was analyzed by loading a measurement signal of a stylus-type continuous film thickness meter into a computer. In addition, “change in thickness in the vicinity” is 0.04 based on the measured thickness pattern.
The peaks and valleys (unevenness) having a height difference of not less than μm were targeted, and the average height between adjacent peaks and valleys was expressed.
【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%(ポリアリレート:19.998重量%、燐酸系
熱安定剤:0.002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〔BYK(登録商標)−3
10:ビックケミー・ジャパン株式会社製〕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65
μmであった。このフィルムの近傍の厚み変化は0.2
2μmであり、これは平均厚みの0.34%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.
A polyester modified dimethylpolysiloxane solution as a surface modifier [BYK (registered trademark)- Three
10: manufactured by Big Chemie Japan Co., Ltd.] 2 parts by weight were 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 is 65.
was μm. The thickness change in the vicinity of this film is 0.2
2 μm, which corresponds to 0.34% of the average thickness.
【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の厚み変化は0.36μ
m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 0.36μ
m 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、近傍の厚み変化は0.82μmであり、平均厚み
の1.09%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
At m, the change in thickness in the vicinity was 0.82 μm, which was 1.09% 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
ルムの近傍の厚み変化は0.16μmであり、これは、
平均厚みの0.23%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 thickness change near this film is 0.16 μm, which is
It was equivalent to 0.23% 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、近傍の厚み変化は0.36μm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
At m, the change in thickness in the vicinity was 0.36 μm, corresponding 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】本発明の製造方法によれば、得られる光
学用耐熱透明フィルムの、0.04μm以上の高低差を
有する凹凸を対象とした隣接する山谷間の平均高さ、す
なわち近傍の厚み変化を平均膜厚の0.5%以下、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。According to the production method of the present invention, the average height between adjacent peaks and valleys, that is, the thickness in the vicinity, of the resulting heat-resistant transparent optical film for unevenness having a height difference of 0.04 μm or more is targeted. It is also possible to make the change 0.5% or less, more preferably 0.4% or less of the average film thickness. 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.7 識別記号 FI G02B 5/30 G02B 5/30 // B29K 67:00 B29K 67:00 105:32 105:32 B29L 11:00 B29L 11:00 C08L 67:00 C08L 67:00 (56)参考文献 特開 昭57−40556(JP,A) 特開 昭60−71004(JP,A) 特開 平6−89038(JP,A) 特開 平5−86295(JP,A) 特開 平1−270004(JP,A) 特開 平3−115324(JP,A) (58)調査した分野(Int.Cl.7,DB名) C08J 5/18 B29C 55/02 C08L 67/00 G02B 5/30 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI G02B 5/30 G02B 5/30 // B29K 67:00 B29K 67:00 105: 32 105: 32 B29L 11:00 B29L 11:00 C08L 67:00 C08L 67:00 (56) Reference JP-A-57-40556 (JP, A) JP-A-60-71004 (JP, A) JP-A-6-89038 (JP, A) JP-A-5 -86295 (JP, A) JP-A 1-270004 (JP, A) JP-A 3-115324 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) C08J 5/18 B29C 55/02 C08L 67/00 G02B 5/30
Claims (5)
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
中にシリコン系化合物からなる表面調整剤を添加するこ
とを特徴とする光学用耐熱透明フィルム(但し、電子写
真感光体用フィルムを除く)の製造方法。1. When a heat-resistant transparent film made of an amorphous polymer having an aromatic group in its main chain is formed by a solution casting method, a surface conditioner made of a silicon compound is added to a dope for casting. A method for producing a heat resistant transparent film for optics (however, excluding a film for an electrophotographic photoreceptor).
格を有するシリコン系化合物である請求項1記載の製造
方法。2. The method according to claim 1, wherein the surface modifier is a silicon compound having a dimethylpolysiloxane skeleton.
リエステル変性したポリシロキサン系化合物である請求
項1記載の製造方法。 【化1】 (但し、R3 =−R4 −O−CO−R5 −CO−O−R
6 −O−R7 −Yであり、R4 、R5 、R6 、R7 はア
ルキレン基、アリーレン基、アラアルキレン基から選択
され、Yは水素または水酸基、カルボキシル基、アミノ
基の極性基から選択される。Vは0〜100、Wは1〜
100までの整数。)3. The method according to claim 1, wherein the surface treatment agent is a polyester-modified polysiloxane compound represented by the following general formula. [Chemical 1] (Wherein, R 3 = -R 4 -O- CO-R 5 -CO-O-R
6 is -O-R 7 -Y, R 4 , R 5, R 6, R 7 is selected alkylene group, an arylene group, from aralkylene group, Y is hydrogen or a hydroxyl group, a carboxyl group, the polar group of the amino group Selected from. V is 0 to 100, W is 1
An integer up to 100. )
主鎖に芳香族基を有するアモルファスなポリマー100
重量部に対して0.1〜5重量部添加する請求項1記載
の製造方法。4. An amorphous polymer 100 having a surface modifier made of a silicon compound and having an aromatic group in its main chain.
The manufacturing method according to claim 1, wherein 0.1 to 5 parts by weight is added to parts by weight.
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。5. A method for producing a retardation film, which comprises uniaxially stretching the heat-resistant transparent film obtained in any one of claims 1 to 4.
Priority Applications (1)
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JP9539293A JP3370383B2 (en) | 1993-03-29 | 1993-03-29 | Heat-resistant transparent film and method for producing the same |
Applications Claiming Priority (1)
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JP9539293A JP3370383B2 (en) | 1993-03-29 | 1993-03-29 | Heat-resistant transparent film and method for producing the same |
Related Child Applications (1)
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JP2002061943A Division JP2002275290A (en) | 2002-03-07 | 2002-03-07 | Heat-resistant transparent film |
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Publication Number | Publication Date |
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JPH06279598A JPH06279598A (en) | 1994-10-04 |
JP3370383B2 true JP3370383B2 (en) | 2003-01-27 |
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ID=14136381
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JP5680426B2 (en) * | 2011-01-17 | 2015-03-04 | 住友化学株式会社 | Liquid crystal polyester-containing liquid composition |
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