JPH05273412A - Manufacture of polarizing film - Google Patents
Manufacture of polarizing filmInfo
- Publication number
- JPH05273412A JPH05273412A JP4070646A JP7064692A JPH05273412A JP H05273412 A JPH05273412 A JP H05273412A JP 4070646 A JP4070646 A JP 4070646A JP 7064692 A JP7064692 A JP 7064692A JP H05273412 A JPH05273412 A JP H05273412A
- Authority
- JP
- Japan
- Prior art keywords
- film
- potassium iodide
- polarizing film
- boric acid
- treating
- 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.)
- Granted
Links
Landscapes
- Polarising Elements (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、偏光フィルムの製造方
法に関する。FIELD OF THE INVENTION The present invention relates to a method for producing a polarizing film.
【０００２】[0002]
【従来の技術および発明が解決しようとする課題】偏光
フィルムは液晶表示装置等に広く用いられ、その光学性
能は、高透明、高偏光度のもので、しかも安定した品質
のものが要求されている。偏光フィルムとしては、ポリ
ビニルアルコール系樹脂を用いたものが繁用され、ポリ
ビニルアルコール系樹脂を用いた偏光フィルムとして
は、ポリビニルアルコール系樹脂に二色性染料を吸着配
向させた染料系フィルム、ポリビニルアルコール系樹脂
を部分的に脱水処理したポリエン系フィルム、ポリビニ
ルアルコール系樹脂にヨウ素を吸着配向させたヨウ素系
フィルム等が知られている。これらのなかではヨウ素系
フィルムが他のものに比べ、偏光性能の点で優れてお
り、その製造方法としては、例えば、特開昭６１−２０
００３号公報や特開平４−４３５０４号公報に記載され
た方法が知られている。しかしながら、高透明で高偏光
度のフィルムを製造するという点ではいまだ満足できる
ものではない。2. Description of the Related Art Polarizing films are widely used in liquid crystal display devices and the like, and their optical performances are required to have high transparency and high polarization degree and stable quality. There is. As the polarizing film, one using a polyvinyl alcohol-based resin is often used, and as the polarizing film using the polyvinyl alcohol-based resin, a dye-based film in which a dichroic dye is adsorbed and oriented on the polyvinyl alcohol-based resin, polyvinyl alcohol. Known are polyene-based films obtained by partially dehydrating a resin-based resin, iodine-based films obtained by adsorbing and orienting iodine on a polyvinyl alcohol-based resin, and the like. Among these, iodine-based films are superior to others in terms of polarization performance, and as a method for producing them, for example, JP-A-61-20
The methods described in Japanese Patent Laid-Open No. 003 and Japanese Patent Laid-Open No. 4-43504 are known. However, it is still unsatisfactory in terms of producing a highly transparent film having a high degree of polarization.
【０００３】本発明者らは、ポリビニルアルコール系樹
脂を用いる偏光フィルムの製造方法に付き、鋭意検討を
重ねた結果、ヨウ素を吸着配向させたポリビニルアルコ
ール系樹脂の一軸延伸フィルムを、ヨウ化カリウムおよ
びホウ酸を含む水溶液で処理し、次いで水洗処理する偏
光フィルムの製造方法において、ヨウ化カリウムおよび
ホウ酸を含む水溶液での処理および水洗処理を特定の範
囲で行うことにより、高透明、高偏光度で、しかも安定
した品質の偏光フィルムが得られることを見出し、本発
明にいたった。The inventors of the present invention have made extensive studies as to a method for producing a polarizing film using a polyvinyl alcohol-based resin, and as a result, have found that a uniaxially stretched film of a polyvinyl alcohol-based resin in which iodine is adsorbed and oriented is treated with potassium iodide and In a method for producing a polarizing film, which is treated with an aqueous solution containing boric acid and then washed with water, by performing treatment with an aqueous solution containing potassium iodide and boric acid and washing treatment in a specific range, high transparency and high polarization degree are obtained. In addition, the inventors have found that a polarizing film having stable quality can be obtained, and have reached the present invention.
【０００４】[0004]
【課題を解決するための手段】即ち、本発明は、ヨウ素
を吸着配向させたポリビニルアルコール系樹脂の一軸延
伸フィルムを、ヨウ化カリウムおよびホウ酸を含む水溶
液で処理し、次いで水洗処理する偏光フィルムの製造方
法において、 ２〜２０重量部のヨウ化カリウムおよび２〜１５重量
部のホウ酸を含む水溶液で処理し、次いで 水洗処理を、 ・処理温度を１０℃以下で行うか、 ・処理温度が１０℃を越え２０℃以下のときは処理時間
を６０秒以下で行うか、 ・処理温度が２０℃を越えるときは処理時間を３０秒以
下で行う、 ことを特徴とする偏光フィルムの製造方法に関するもの
である。That is, the present invention provides a polarizing film in which a uniaxially stretched film of a polyvinyl alcohol resin in which iodine is adsorbed and oriented is treated with an aqueous solution containing potassium iodide and boric acid, and then washed with water. In the production method of, the treatment is performed with an aqueous solution containing 2 to 20 parts by weight of potassium iodide and 2 to 15 parts by weight of boric acid, and then water washing treatment is carried out at a treatment temperature of 10 ° C. or lower, or A method for producing a polarizing film, characterized in that the treatment time is 60 seconds or less when the temperature exceeds 10 ° C and 20 ° C or less, or the treatment time is 30 seconds or less when the processing temperature exceeds 20 ° C. It is a thing.
【０００５】以下、本発明を詳細に説明する。使用する
ポリビニルアルコール系樹脂フィルムとしては、例え
ば、ポリビニルアルコールフィルム、ポリビニルホルマ
ールフィルム、ポリビニルアセタールフィルム、ポリ
（エチレン−酢酸ビニル）共重合体フィルム、これらの
部分ケン化または完全ケン化フィルム、ポリビニルアル
コールの部分ポリエン化フィルム等を挙げることができ
る。The present invention will be described in detail below. As the polyvinyl alcohol-based resin film used, for example, polyvinyl alcohol film, polyvinyl formal film, polyvinyl acetal film, poly (ethylene-vinyl acetate) copolymer film, partially saponified or fully saponified film thereof, polyvinyl alcohol Partially polyene film and the like can be mentioned.
【０００６】ヨウ素を吸着配向させたポリビニルアルコ
ール系樹脂の一軸延伸フィルムの調製方法としては、通
常の方法が適用でき、例えば、未延伸のポリビニルアル
コール系樹脂フィルムをヨウ素およびヨウ化カリウムの
溶液に浸漬した後、一軸に延伸する方法、一軸に延伸し
たポリビニルアルコール系樹脂フィルムをヨウ素および
ヨウ化カリウムの溶液に浸漬する方法等を挙げることが
できる。As a method for preparing a uniaxially stretched film of a polyvinyl alcohol resin in which iodine is adsorbed and oriented, a usual method can be applied. For example, an unstretched polyvinyl alcohol resin film is dipped in a solution of iodine and potassium iodide. Then, a method of uniaxially stretching, a method of immersing the uniaxially stretched polyvinyl alcohol-based resin film in a solution of iodine and potassium iodide, and the like can be mentioned.
【０００７】ヨウ素を吸着配向させたポリビニルアルコ
ール系樹脂の一軸延伸フィルムを、ヨウ化カリウムおよ
びホウ酸を含む水溶液で処理する方法としては、例え
ば、該フィルムをヨウ化カリウムおよびホウ酸を含む水
溶液に浸漬させる方法を挙げることができる。使用する
水溶液中のほう酸の濃度は、水１００重量部に対し２〜
１５重量部とすることが必要であり、好ましくは７〜１
０重量部である。２重量部未満では満足な偏光フィルム
は得られず、１５重量部を越える場合は結晶の析出等の
問題が発生する。使用する水溶液中のヨウ化カリウムの
濃度は、水１００重量部に対し２〜２０重量部とするこ
とが必要であり、好ましくは５〜１２重量部である。２
重量部未満、２０重量部を越える場合ともに満足な偏光
フィルムは得られない。As a method for treating a uniaxially stretched film of polyvinyl alcohol resin in which iodine is adsorbed and oriented with an aqueous solution containing potassium iodide and boric acid, for example, the film is treated with an aqueous solution containing potassium iodide and boric acid. A method of dipping can be mentioned. The concentration of boric acid in the aqueous solution used is 2 to 100 parts by weight of water.
It is necessary to use 15 parts by weight, preferably 7 to 1
0 parts by weight. If it is less than 2 parts by weight, a satisfactory polarizing film cannot be obtained, and if it exceeds 15 parts by weight, problems such as crystal precipitation occur. The concentration of potassium iodide in the aqueous solution to be used needs to be 2 to 20 parts by weight, preferably 5 to 12 parts by weight, based on 100 parts by weight of water. Two
When the amount is less than 20 parts by weight or more than 20 parts by weight, a satisfactory polarizing film cannot be obtained.
【０００８】ヨウ化カリウムおよびほう酸を含む水溶液
で該フィルムを処理する温度は、通常、５５〜８０℃の
範囲、好ましくは６０〜７０℃の範囲である。ヨウ化カ
リウムおよびほう酸を含む水溶液で該フィルムを処理す
る時間は、通常、１００〜１２００秒であり、好ましく
は１５０〜６００秒である。The temperature for treating the film with an aqueous solution containing potassium iodide and boric acid is usually in the range of 55 to 80 ° C, preferably 60 to 70 ° C. The time for treating the film with an aqueous solution containing potassium iodide and boric acid is usually 100 to 1200 seconds, preferably 150 to 600 seconds.
【０００９】ヨウ化カリウムおよびホウ酸を含む水溶液
で処理した該フィルムの水洗処理は、処理温度あるいは
処理温度と処理時間を制御する必要があり、具体的に
は、該水洗処理を、 ・処理温度を１０℃以下で行うか、 ・処理温度が１０℃を越え２０℃以下のときは処理時間
を６０秒以下で行うか、 ・処理温度が２０℃を越えるときは処理時間を３０秒以
下で行う、 必要がある。通常は、 ・処理温度が０℃以上１０℃以下のときは処理時間を５
秒以上１２０秒以下、 ・処理温度が１０℃を越え２０℃以下のときは処理時間
を５秒以上６０秒以下、 ・処理温度が２０℃を越え３０℃以下のときは処理時間
を５秒以上３０秒以下、 で処理を行う。工業的生産の点からは処理温度が４℃以
上で、且つ上記した通常の処理条件を満たすことが好ま
しい。３０℃より高い温度での処理、５秒未満または１
２０秒を越える時間での処理は得られるフィルムの品質
上好ましくない。水洗処理後、通常の乾燥を行うことに
より高透明で高偏光度の偏光フィルムが得られる。In the water washing treatment of the film treated with an aqueous solution containing potassium iodide and boric acid, it is necessary to control the treatment temperature or the treatment temperature and the treatment time. Is performed at a temperature of 10 ° C or lower, -When the treatment temperature is higher than 10 ° C and lower than 20 ° C, the treatment time is 60 seconds or shorter, -When the treatment temperature is higher than 20 ° C, the treatment time is shorter than 30 seconds. , There is a need. Normally, ・ When the processing temperature is 0 ℃ to 10 ℃, the processing time is 5
Seconds or more and 120 seconds or less, -Treatment time is 5 seconds or more and 60 seconds or less when the treatment temperature is 10 ° C or more and 20 ° C or less, -Treatment time is 5 seconds or more when the treatment temperature is 20 ° C or more and 30 ° C or less Processing is performed for 30 seconds or less. From the viewpoint of industrial production, it is preferable that the treatment temperature is 4 ° C. or higher and the above-mentioned usual treatment conditions are satisfied. Treatment at temperatures above 30 ° C, less than 5 seconds or 1
Processing for more than 20 seconds is not preferable in terms of quality of the obtained film. After washing with water, ordinary drying is performed to obtain a highly transparent polarizing film with a high degree of polarization.
【００１０】[0010]
【発明の効果】本発明によれば、ヨウ素を吸着配向させ
たポリビニルアルコール系樹脂の一軸延伸フィルムを、
ヨウ化カリウムおよびホウ酸を含む水溶液で処理し、次
いで水洗処理する偏光フィルムの製造方法において、ヨ
ウ化カリウムおよびホウ酸を含む水溶液での処理および
水洗処理を特定の範囲で行うことにより、従来より高透
明、高偏光度で、しかも安定した品質の偏光フィルムを
得ることができる。According to the present invention, a uniaxially stretched film of a polyvinyl alcohol resin in which iodine is adsorbed and oriented,
Treated with an aqueous solution containing potassium iodide and boric acid, and then washed with water, in a method for producing a polarizing film, by performing a treatment with an aqueous solution containing potassium iodide and boric acid and a washing process in a specific range, It is possible to obtain a polarizing film having high transparency, high degree of polarization, and stable quality.
【００１１】[0011]
【実施例】以下、実施例により本発明をさらに詳細に説
明するが、本発明は実施例に限定されるものではない。
透過率Ｔは、４００〜７００ｎｍの波長域で１０ｎｍお
きに求めた分光透過率τλから、次式により算出した。
尚、式中、Ｐλは標準光（Ｃ光源）の分光分布、ｙλは
２度視野Ｘ、Ｙ、Ｚ系に基づく等色関数である。分光透
過率τλは分光光度計（東京電色の測色計）を用いて測
定した。 １枚の偏光フィルムの透過率をＴ、２枚の偏光フィルム
をその配向方向が同一になるように重ねた場合の透過率
を平行位透過率ＴP 、２枚の偏光フィルムをその配向が
直交するように重ねた場合の透過率を直交位透過率ＴC
とそれぞれ称する。偏光度Ｖは平行位透過率ＴP および
直交位透過率ＴC から次式で算出した。 EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited to the examples.
The transmittance T was calculated by the following equation from the spectral transmittance τλ obtained every 10 nm in the wavelength range of 400 to 700 nm.
In the formula, Pλ is a spectral distribution of standard light (C light source), and yλ is a color matching function based on the 2-degree visual field X, Y, and Z systems. The spectral transmittance τλ was measured using a spectrophotometer (Tokyo Denshoku colorimeter). The transmittance of one polarizing film is T, and the transmittance when two polarizing films are stacked so that their orientations are the same. The parallel transmittance is T P , and the two polarizing films have their orientations orthogonal to each other. the transmittance orthogonal position transmittance in the case of repeated to T C
Respectively. The polarization degree V was calculated from the parallel transmittance T P and the orthogonal transmittance T C by the following formula.
【００１２】製造例１ ケン化度９９．５％のポリビニルアルコール樹脂からな
る厚さ８０μｍのフィルムに、１００℃以上で５倍の一
軸延伸を施し、偏光基材とする。この偏光基材を緊張状
態に保ったまま６０℃の水で６０秒間処理した後、水１
００重量部に対しヨウ素０．０５重量部、ヨウ化カリウ
ム５重量部からなる水溶液に６０秒間浸漬してヨウ素を
吸着配向させたポリビニルアルコール樹脂の一軸延伸フ
ィルムを得る。Production Example 1 A film having a thickness of 80 μm and made of a polyvinyl alcohol resin having a saponification degree of 99.5% is uniaxially stretched 5 times at 100 ° C. or higher to obtain a polarizing substrate. After treating the polarizing substrate with water at 60 ° C. for 60 seconds while keeping it in a tension state, water 1
A uniaxially stretched film of polyvinyl alcohol resin in which iodine is adsorbed and oriented is obtained by immersing in an aqueous solution of 0.05 parts by weight of iodine and 5 parts by weight of potassium iodide for 60 seconds with respect to 00 parts by weight.
【００１３】実施例１ 製造例１で得られるフィルムを、水１００重量部に対し
ヨウ化カリウム６重量部、ほう酸７．５重量部からなる
６５℃の水溶液に３００秒間浸漬する。その後、２５℃
の純水で２０秒間水洗した後、５０℃で乾燥すると、単
体透過率（Ｔ）４３．７％で偏光度（Ｖ）９９．２％の
光学性能の偏光フィルムを得る。Example 1 The film obtained in Production Example 1 is immersed for 300 seconds in an aqueous solution of 6 parts by weight of potassium iodide and 7.5 parts by weight of boric acid at 65 ° C. with respect to 100 parts by weight of water. After that, 25 ℃
After being washed with pure water for 20 seconds and dried at 50 ° C., a polarizing film having an optical performance with a single transmittance (T) of 43.7% and a polarization degree (V) of 99.2% is obtained.
【００１４】比較例１ 水洗処理を２５℃で６０秒間行う以外は実施例１と同様
の処理を行い、単体透過率（Ｔ）４３．７％で偏光度
（Ｖ）９８．８％の光学性能の偏光フィルムを得る。Comparative Example 1 The same treatment as in Example 1 was carried out except that the washing treatment was carried out at 25 ° C. for 60 seconds, and the optical performance was such that the simple substance transmittance (T) was 43.7% and the polarization degree (V) was 98.8%. To obtain a polarizing film.
【００１５】実施例２ 製造例１で得られるフィルムを、水１００重量部に対し
ヨウ化カリウム６重量部、ほう酸７．５重量部からなる
６７℃の水溶液に１６０秒間浸漬する。その後、１５℃
の純水で３６秒間水洗した後、６０℃で乾燥すると、単
体透過率（Ｔ）４３．０％で偏光度（Ｖ）９９．９％の
光学性能の偏光フィルムを得る。Example 2 The film obtained in Production Example 1 is immersed in an aqueous solution of 6 parts by weight of potassium iodide and 7.5 parts by weight of boric acid at 67 ° C. for 100 seconds with respect to 100 parts by weight of water. After that, 15 ℃
After washing with pure water for 36 seconds and drying at 60 ° C., a polarizing film having optical performance with a single transmittance (T) of 43.0% and a polarization degree (V) of 99.9% is obtained.
【００１６】比較例１ 水洗処理を２５℃で３６秒間行う以外は実施例２と同様
の処理を行い、単体透過率（Ｔ）４２．９％で偏光度
（Ｖ）９９．４％の光学性能の偏光フィルムを得る。COMPARATIVE EXAMPLE 1 The optical performance was the same as in Example 2 except that the washing treatment was carried out at 25 ° C. for 36 seconds, and the single layer transmittance (T) was 42.9% and the polarization degree (V) was 99.4%. To obtain a polarizing film.
Claims (2)
ール系樹脂の一軸延伸フィルムを、ヨウ化カリウムおよ
びホウ酸を含む水溶液で処理し、次いで水洗処理する偏
光フィルムの製造方法において、 ２〜２０重量部のヨウ化カリウムおよび２〜１５重量
部のホウ酸を含む水溶液で処理し、次いで 水洗処理を、 ・処理温度を１０℃以下で行うか、 ・処理温度が１０℃を越え２０℃以下のときは処理時間
を６０秒以下で行うか、 ・処理温度が２０℃を越えるときは処理時間を３０秒以
下で行う、 ことを特徴とする偏光フィルムの製造方法。1. A method for producing a polarizing film, which comprises treating a uniaxially stretched film of a polyvinyl alcohol-based resin in which iodine is adsorbed and oriented with an aqueous solution containing potassium iodide and boric acid, and then washing with water. Is treated with an aqueous solution containing potassium iodide and 2 to 15 parts by weight of boric acid, and then washed with water at a treatment temperature of 10 ° C. or lower, or when the treatment temperature is higher than 10 ° C. and lower than 20 ° C. The method for producing a polarizing film is characterized in that the treatment time is 60 seconds or less, or when the treatment temperature exceeds 20 ° C., the treatment time is 30 seconds or less.
で処理する温度が５５〜８０℃である請求項１に記載の
方法。2. The method according to claim 1, wherein the temperature of the treatment with the aqueous solution containing potassium iodide and boric acid is 55 to 80 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07064692A JP3331615B2 (en) | 1992-03-27 | 1992-03-27 | Manufacturing method of polarizing film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07064692A JP3331615B2 (en) | 1992-03-27 | 1992-03-27 | Manufacturing method of polarizing film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05273412A true JPH05273412A (en) | 1993-10-22 |
| JP3331615B2 JP3331615B2 (en) | 2002-10-07 |
Family
ID=13437628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07064692A Expired - Lifetime JP3331615B2 (en) | 1992-03-27 | 1992-03-27 | Manufacturing method of polarizing film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3331615B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1090517A (en) * | 1996-09-17 | 1998-04-10 | Sumitomo Chem Co Ltd | Iodine base polarizing plate |
| EP2426522A1 (en) * | 2009-05-01 | 2012-03-07 | Nitto Denko Corporation | Method for producing polarizer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5365426U (en) * | 1976-11-05 | 1978-06-01 | ||
| JPS5762520U (en) * | 1980-10-01 | 1982-04-14 |
-
1992
- 1992-03-27 JP JP07064692A patent/JP3331615B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5365426U (en) * | 1976-11-05 | 1978-06-01 | ||
| JPS5762520U (en) * | 1980-10-01 | 1982-04-14 |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1090517A (en) * | 1996-09-17 | 1998-04-10 | Sumitomo Chem Co Ltd | Iodine base polarizing plate |
| EP2426522A1 (en) * | 2009-05-01 | 2012-03-07 | Nitto Denko Corporation | Method for producing polarizer |
| EP2426522A4 (en) * | 2009-05-01 | 2013-08-28 | Nitto Denko Corp | Method for producing polarizer |
| EP2634611A1 (en) * | 2009-05-01 | 2013-09-04 | Nitto Denko Corporation | Poly-Vinyl-Alcohol polarizer based on adsorbed iodine |
| EP2637048A1 (en) * | 2009-05-01 | 2013-09-11 | Nitto Denko Corporation | Poly-Vinyl-Alcohol polarizer based on adsorbed iodine |
| CN103336327A (en) * | 2009-05-01 | 2013-10-02 | 日东电工株式会社 | Polarizing film and laminating body with the polarizing film |
| US9291744B2 (en) | 2009-05-01 | 2016-03-22 | Nitto Denko Corporation | Method for producing polarizer |
| US9329307B2 (en) | 2009-05-01 | 2016-05-03 | Nitto Denko Corporation | Method for producing polarizer |
| US9575214B2 (en) | 2009-05-01 | 2017-02-21 | Nitto Denko Corporation | Method for producing polarizer |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3331615B2 (en) | 2002-10-07 |
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