JP2001174634A - Method of producing polarizing film - Google Patents
Method of producing polarizing filmInfo
- Publication number
- JP2001174634A JP2001174634A JP35576099A JP35576099A JP2001174634A JP 2001174634 A JP2001174634 A JP 2001174634A JP 35576099 A JP35576099 A JP 35576099A JP 35576099 A JP35576099 A JP 35576099A JP 2001174634 A JP2001174634 A JP 2001174634A
- Authority
- JP
- Japan
- Prior art keywords
- polyvinyl alcohol
- film
- polarizing film
- alcohol resin
- resin film
- 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
- 238000000034 method Methods 0.000 title claims abstract description 9
- 229920005989 resin Polymers 0.000 claims abstract description 39
- 239000011347 resin Substances 0.000 claims abstract description 39
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 36
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 36
- 238000001035 drying Methods 0.000 claims abstract description 27
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000004327 boric acid Substances 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 238000005406 washing Methods 0.000 claims abstract description 4
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 6
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 239000007864 aqueous solution Substances 0.000 description 13
- 239000011521 glass Substances 0.000 description 12
- 238000010306 acid treatment Methods 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000004043 dyeing Methods 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 229910052740 iodine Inorganic materials 0.000 description 3
- 239000011630 iodine Substances 0.000 description 3
- 229920002689 polyvinyl acetate Polymers 0.000 description 3
- 239000011118 polyvinyl acetate Substances 0.000 description 3
- 229920002284 Cellulose triacetate Polymers 0.000 description 2
- DKNPRRRKHAEUMW-UHFFFAOYSA-N Iodine aqueous Chemical compound [K+].I[I-]I DKNPRRRKHAEUMW-UHFFFAOYSA-N 0.000 description 2
- 241000519995 Stachys sylvatica Species 0.000 description 2
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000007127 saponification reaction Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 102100024522 Bladder cancer-associated protein Human genes 0.000 description 1
- 101150110835 Blcap gene Proteins 0.000 description 1
- 101100493740 Oryza sativa subsp. japonica BC10 gene Proteins 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical class C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 1
- 150000001241 acetals Chemical class 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 229920005994 diacetyl cellulose Polymers 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical group II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000636 poly(norbornene) polymer Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
Landscapes
- Polarising Elements (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
(57)【要約】
【課題】 所謂白ヌケが発生し難い液晶表示装置を可能
とする偏光フィルムを製造し得る方法を提供する。
【解決手段】 ２色性色素により染色され、ホウ酸処理
された一軸延伸ポリビニルアルコール樹脂フィルムを水
洗処理した後、張力を付与しながら乾燥処理して偏光フ
ィルムを製造する方法であり、乾燥処理における単位幅
あたりの張力（Ａ）（単位はＮ／ｍ）と温度（Ｂ）（単
位は℃）とが不等式（１）
Ａ ≦ ０．１２２５Ｂ2 − ９．９４７Ｂ ＋ ３７６．３２ （
１）
を満足することを特徴とする偏光フィルムの製造方法。(57) [Summary] [PROBLEMS] To provide a method capable of manufacturing a polarizing film that enables a liquid crystal display device in which so-called white dropout is unlikely to occur. SOLUTION: This is a method of manufacturing a polarizing film by washing a uniaxially stretched polyvinyl alcohol resin film dyed with a dichroic dye and treated with boric acid, followed by drying while applying a tension to produce a polarizing film. The tension (A) (unit: N / m) and temperature (B) (unit: ° C.) per unit width satisfy the inequality (1): A ≦ 0.1225B 2 −9.947B + 376.32 (1) A method for producing a polarizing film.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、偏光フィルムの製
造方法に関する。[0001] The present invention relates to a method for producing a polarizing film.
【０００２】[0002]
【従来の技術】偏光フィルムは、液晶表示装置を構成す
る光学部品の一として有用である。従来から偏光フィル
ムの製造方法として、２色性色素により染色された一軸
延伸ポリビニルアルコール樹脂フィルムをホウ酸処理
し、水洗処理した後、乾燥処理する方法は広く知られて
いる。かくして得られた偏光フィルムは、その両面また
は片面に保護フィルムが積層された偏光板として液晶表
示装置に組込まれて使用される。2. Description of the Related Art A polarizing film is useful as one of optical parts constituting a liquid crystal display. 2. Description of the Related Art Conventionally, as a method for manufacturing a polarizing film, a method in which a uniaxially stretched polyvinyl alcohol resin film dyed with a dichroic dye is subjected to boric acid treatment, washed with water, and then dried is widely known. The polarizing film thus obtained is used by being incorporated in a liquid crystal display device as a polarizing plate having a protective film laminated on both surfaces or one surface thereof.
【０００３】しかし、かかる液晶表示装置を高温下で使
用すると、表示画面の周囲四辺の中点付近が白く見え
る、所謂「白ヌケ」と呼ばれる現象が発生することがあ
った。かかる白ヌケが発生すると、表示画面の周囲四辺
の中点付近のコントラストは低下し、表示品質が低下す
る。[0003] However, when such a liquid crystal display device is used at a high temperature, a phenomenon called so-called "white loss" may occur in which the vicinity of the center of the four sides of the display screen looks white. When such white drop occurs, the contrast near the midpoint of the four sides of the display screen decreases, and the display quality decreases.
【０００４】[0004]
【発明が解決しようとする課題】そこで、本発明者ら
は、所謂白ヌケが発生し難い液晶表示装置を可能とする
偏光フィルムを製造し得る方法を開発するべく鋭意検討
した結果、２色性色素により染色された一軸延伸ポリビ
ニルアルコール樹脂フィルムの乾燥処理における張力
（Ａ）と温度（Ｂ）とが所定の関係式を満足する場合に
は、白ヌケの発生が少ないことを見出し、本発明に至っ
た。The inventors of the present invention have conducted intensive studies to develop a method for manufacturing a polarizing film capable of producing a liquid crystal display device in which so-called white spotting is unlikely to occur. When the tension (A) and the temperature (B) in the drying treatment of the uniaxially stretched polyvinyl alcohol resin film dyed with a dye satisfy a predetermined relational expression, it has been found that the occurrence of white spots is small, and the present invention Reached.
【０００５】[0005]
【課題を解決する為の手段】すなわち、本発明は、２色
性色素により染色され、ホウ酸処理された一軸延伸ポリ
ビニルアルコール樹脂フィルムを水洗処理した後、張力
を付与しながら乾燥処理して偏光フィルムを製造する方
法であり、乾燥処理における単位幅あたりの張力（Ａ）
（単位はＮ／ｍ）と温度（Ｂ）（単位は℃）とが不等式
（１） Ａ ≦ ０．１２２５Ｂ2 − ９．９４７Ｂ ＋ ３７６．３２ （１） を満足することを特徴とする偏光フィルムの製造方法を
提供するものである。That is, the present invention provides a uniaxially stretched polyvinyl alcohol resin film which has been dyed with a dichroic dye and has been treated with boric acid, washed with water, and dried under tension to obtain polarized light. This is a method for producing a film, and the tension per unit width in the drying treatment (A)
A polarizing film characterized in that (unit: N / m) and temperature (B) (unit: ° C.) satisfy the inequality (1) A ≦ 0.1225B 2 −9.947B + 376.32 (1) Is provided.
【０００６】[0006]
【発明の実施の形態】本発明の製造方法に適用される一
軸延伸ポリビニルアルコール樹脂フィルムは、ポリビニ
ルアルコール樹脂フィルムが一軸延伸されたフィルムで
ある。ポリビニルアルコール樹脂フィルムにおけるポリ
ビニルアルコール樹脂としては、例えばポリ酢酸ビニル
樹脂をケン化することにより得られる樹脂が挙げられ
る。ポリ酢酸ビニル樹脂としては、例えばポリ酢酸ビニ
ル、酢酸ビニルおよびこれと共重合可能な他の単量体の
共重合体などが例示される。他の単量体としては、例え
ば不飽和カルボン酸類、オレフィン類、ビニルエーテル
類、不飽和スルホン酸類などが挙げられる。ケン化度は
通常８５モル％〜１００モル％、好ましくは９８モル％
〜１００モル％の範囲である。ポリビニルアルコール樹
脂はさらに変成されていてもよく、かかる変成されたポ
リビニルアルコール樹脂としては、例えばポリビニルホ
ルマール、ポリビニルアセタールなどが挙げられる。ポ
リビニルアルコール樹脂の重合度は通常１０００〜１０
０００の範囲、好ましくは１５００〜１００００の範囲
である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The uniaxially stretched polyvinyl alcohol resin film applied to the production method of the present invention is a film obtained by uniaxially stretching a polyvinyl alcohol resin film. Examples of the polyvinyl alcohol resin in the polyvinyl alcohol resin film include a resin obtained by saponifying a polyvinyl acetate resin. Examples of the polyvinyl acetate resin include polyvinyl acetate, vinyl acetate, and copolymers of other monomers copolymerizable therewith. Other monomers include, for example, unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and the like. The degree of saponification is usually 85 mol% to 100 mol%, preferably 98 mol%.
１００100 mol%. The polyvinyl alcohol resin may be further modified, and examples of the modified polyvinyl alcohol resin include polyvinyl formal and polyvinyl acetal. The polymerization degree of the polyvinyl alcohol resin is usually 1000 to 10
000, preferably 1500-10000.
【０００７】かかるポリビニルアルコール樹脂フィルム
は一軸延伸されるとともに２色性色素により染色され、
ホウ酸処理される。一軸延伸するには、周速の異なるロ
ール間で一軸に延伸してもよいし、熱ロールを用いて一
軸に延伸してもよい。また、大気中で延伸する乾式延伸
であってもよいし、溶剤で膨潤した状態で延伸を行う湿
式延伸であってもよい。延伸倍率は通常４〜８倍程度で
ある。The polyvinyl alcohol resin film is uniaxially stretched and dyed with a dichroic dye.
Boric acid treated. For uniaxial stretching, the film may be uniaxially stretched between rolls having different peripheral speeds, or may be uniaxially stretched using a hot roll. The stretching may be dry stretching in the air or wet stretching in which the film is swollen with a solvent. The stretching ratio is usually about 4 to 8 times.
【０００８】ポリビニルアルコール樹脂フィルムを２色
性色素で染色するには、例えばポリビニルアルコール樹
脂フィルムを２色性色素を含有する水溶液に浸漬すれば
よい。In order to dye a polyvinyl alcohol resin film with a dichroic dye, for example, the polyvinyl alcohol resin film may be immersed in an aqueous solution containing a dichroic dye.
【０００９】２色性色素としてヨウ素を用いる場合に
は、例えばポリビニルアルコール樹脂フィルムをヨウ素
およびヨウ化カリウムを含有する水溶液に浸漬すればよ
い。かかる水溶液におけるヨウ素の含有量は通常水１０
０重量部あたり０．０１〜０．５重量部程度であり、ヨ
ウ化カリウムの含有量は通常水１００重量部あたり０．
５〜１０重量部程度である。かかる水溶液の温度は通常
２０〜４０℃程度であり、浸漬時間は通常３０〜３００
秒程度である。When iodine is used as the dichroic dye, for example, a polyvinyl alcohol resin film may be immersed in an aqueous solution containing iodine and potassium iodide. The content of iodine in such an aqueous solution is usually 10
It is about 0.01 to 0.5 parts by weight per 0 parts by weight, and the content of potassium iodide is usually 0.1 to 100 parts by weight of water.
It is about 5 to 10 parts by weight. The temperature of such an aqueous solution is usually about 20 to 40 ° C, and the immersion time is usually 30 to 300.
On the order of seconds.
【００１０】２色性色素として２色性染料を用いる場合
には、例えばポリビニルアルコール樹脂フィルムを２色
性染料の水溶液に浸漬すればよい。かかる水溶液におけ
る２色性染料の含有量は通常水１００重量部あたり１×
１０ ー3〜１×１０ ー2重量部程度である。かかる水溶液
は、硫酸ナトリウムなどの無機塩を含有していてもよ
い。かかる水溶液の温度は通常２０〜８０℃程度であ
り、浸漬時間は通常３０〜３００秒程度である。When a dichroic dye is used as the dichroic dye
For example, two colors of polyvinyl alcohol resin film
What is necessary is just to immerse in the aqueous solution of the coloring dye. In such an aqueous solution
The dichroic dye content is usually 1 × per 100 parts by weight of water.
10 ーThree~ 1 × 10 ーTwoIt is on the order of parts by weight. Such an aqueous solution
May contain inorganic salts such as sodium sulfate.
No. The temperature of such an aqueous solution is usually about 20 to 80 ° C.
The immersion time is usually about 30 to 300 seconds.
【００１１】ホウ酸処理は、例えば２色性色素により染
色された一軸延伸ポリビニルアルコール樹脂フィルムを
ホウ酸水溶液に浸漬することにより行われる。ホウ酸水
溶液におけるホウ酸の含有量は、通常、水１００重量部
あたり２〜１５重量部程度、好ましくは５〜１２重量部
程度である。ホウ酸水溶液の温度は通常、５０℃以上で
あり、好ましくは５０℃〜８５℃である。浸漬時間は通
常１００〜１２００秒程度、好ましくは１５０〜６００
秒程度、さらに好ましくは２００〜５００秒程度であ
る。The boric acid treatment is performed, for example, by immersing a uniaxially stretched polyvinyl alcohol resin film dyed with a dichroic dye in an aqueous boric acid solution. The content of boric acid in the boric acid aqueous solution is usually about 2 to 15 parts by weight, preferably about 5 to 12 parts by weight per 100 parts by weight of water. The temperature of the boric acid aqueous solution is usually 50 ° C or higher, and preferably 50 ° C to 85 ° C. The immersion time is usually about 100 to 1200 seconds, preferably 150 to 600 seconds.
It is on the order of seconds, more preferably on the order of 200 to 500 seconds.
【００１２】２色性色素がヨウ素である場合、ホウ酸水
溶液はヨウ化カリウムを含有していてもよい。ヨウ化カ
リウムを含有する場合、その含有量は、通常、水１００
重量部あたり２〜２０重量部程度、好ましくは５〜１５
重量部である。When the dichroic dye is iodine, the aqueous boric acid solution may contain potassium iodide. When potassium iodide is contained, the content is usually 100 parts of water.
About 2 to 20 parts by weight, preferably 5 to 15 parts by weight
Parts by weight.
【００１３】一軸延伸は、染色の前に行ってもよいし、
染色と同時的に行ってもよいし、染色後に行ってよい。
また、一軸延伸を染色後に行う場合には、一軸延伸はホ
ウ酸処理の前に行ってもよいし、ホウ酸処理中に行って
もよい。The uniaxial stretching may be performed before dyeing,
It may be performed simultaneously with the dyeing, or may be performed after the dyeing.
When the uniaxial stretching is performed after the dyeing, the uniaxial stretching may be performed before the boric acid treatment or may be performed during the boric acid treatment.
【００１４】ホウ酸処理後のポリビニルアルコール樹脂
フィルムは、通常、水洗処理される。水洗処理は、例え
ばホウ酸処理されたポリビニルアルコール樹脂フィルム
を水に浸漬することにより行われる。水洗処理における
水の温度は通常５〜４０℃程度であり、浸漬時間は通常
２〜１２０秒である。The polyvinyl alcohol resin film after the boric acid treatment is usually washed with water. The water washing treatment is performed, for example, by immersing a boric acid-treated polyvinyl alcohol resin film in water. The temperature of the water in the water washing treatment is usually about 5 to 40 ° C., and the immersion time is usually 2 to 120 seconds.
【００１５】次いで乾燥処理するが、乾燥処理はポリビ
ニルアルコール樹脂フィルムに張力を付与しながら行わ
れる。乾燥処理においてポリビニルアルコール樹脂フィ
ルムに付与される張力および乾燥温度は、上記不等式
（１）を満足する。張力を付与する方法は特に限定され
ず、通常の乾燥処理においてフィルムが弛まないように
張力を付与すると同様の方法で張力を付与すればよい。Next, a drying treatment is performed while applying tension to the polyvinyl alcohol resin film. The tension and the drying temperature applied to the polyvinyl alcohol resin film in the drying process satisfy the above inequality (1). The method for applying the tension is not particularly limited, and the tension may be applied in the same manner as in the case where the tension is applied so that the film is not loosened in the ordinary drying treatment.
【００１６】張力（Ａ）の値は、上記不等式（１）を満
足するのであれば特に限定されないが、張力（Ａ）が小
さいと得られる偏光フィルムにシワが発生し易い傾向に
あり、また８００Ｎ／ｍを超えるとポリビニルアルコー
ル樹脂フィルムが破断し易くなる傾向にあり、通常は５
０Ｎ／ｍ〜８００Ｎ／ｍ程度の範囲である。張力の方向
は、通常、ポリビニルアルコール樹脂フィルムの延伸方
向である。The value of the tension (A) is not particularly limited as long as the above inequality (1) is satisfied. However, when the tension (A) is small, the polarizing film obtained tends to be wrinkled, and has a value of 800 N. / M, the polyvinyl alcohol resin film tends to be easily broken.
It is in the range of about 0 N / m to 800 N / m. The direction of the tension is usually the stretching direction of the polyvinyl alcohol resin film.
【００１７】なお、乾燥処理によって、ポリビニルアル
コール樹脂フィルムはその幅が減少することもあるが、
本発明における単位幅あたりの張力（Ａ）は、乾燥処理
前のポリビニルアルコール樹脂フィルムの幅に基づく値
である。Although the width of the polyvinyl alcohol resin film may be reduced by the drying treatment,
The tension per unit width (A) in the present invention is a value based on the width of the polyvinyl alcohol resin film before the drying treatment.
【００１８】乾燥処理における温度（Ｂ）は、通常４１
℃以上である。また、高温であると得られる偏光フィル
ムの偏光度が低下する傾向にあるので、通常は１００℃
程度以下である。乾燥処理における処理時間は通常１２
０秒〜６００秒程度である。The temperature (B) in the drying treatment is usually 41
° C or higher. Moreover, since the degree of polarization of the obtained polarizing film tends to decrease when the temperature is high, it is usually 100 ° C.
Less than or equal. The processing time in the drying process is usually 12
It is about 0 to 600 seconds.
【００１９】乾燥処理におけるポリビニルアルコール樹
脂フィルムの延伸方向の収縮率が２％以上であると、白
ヌケをより一層防止できるので、好ましい。ここで、収
縮率（Ｒ）とは、ポリビニルアルコール樹脂フィルムの
乾燥処理前の長さ（Ｌ0）と乾燥後の長さ(Ｌ1）とから
計算式（２） Ｒ ＝ （Ｌ0−Ｌ1）／Ｌ0 （２） により算出される値である。It is preferable that the shrinkage in the stretching direction of the polyvinyl alcohol resin film in the drying treatment is 2% or more, since white spots can be further prevented. Here, the shrinkage ratio (R) is calculated from the length (L0) of the polyvinyl alcohol resin film before the drying treatment and the length (L1) of the polyvinyl alcohol resin film after drying (2) R = (L0−L1) / L0. It is a value calculated by (2).
【００２０】乾燥処理によって偏光フィルムを得るが、
この偏光フィルムは張力を付与しない状態で９０℃に６
時間放置した前後の重量（Ｗ0、Ｗ1）から計算式（３） Ｅ ＝１ −（Ｗ1／Ｗ0） （３） （式中、Ｅは重量変化率を、Ｗ0は放置前の偏光フィル
ムの重量を、Ｗ1は放置後の偏光フィルムの重量をそれ
ぞれ示す。）により算出される重量変化率（Ｅ）が８％
以下となることが好ましい。そのため、上記重量変化率
（Ｅ）が８％以下となるように、乾燥処理における温
度、時間が調整される。A polarizing film is obtained by a drying treatment.
The polarizing film is heated to 90 ° C. without tension.
Equation (3) E = 1− (W1 / W0) (3) where E is the weight change rate, and W0 is the weight of the polarizing film before being left for a while. , W1 indicate the weight of the polarizing film after standing.), And the weight change rate (E) calculated by the method is 8%.
It is preferable to be as follows. Therefore, the temperature and time in the drying process are adjusted so that the weight change rate (E) becomes 8% or less.
【００２１】かくして得られる偏光フィルムは、通常の
偏光フィルムと同様に、その片面または両面に保護フィ
ルムを積層して偏光板として用いることができる。保護
フィルムとしては、例えばトリアセチルセルロース、ジ
アセチルセルロースなどのセルロースアセテート樹脂フ
ィルム、アクリル樹脂フィルム、ポリエステル樹脂フィ
ルム、ポリアリレート樹脂フィルム、ポリエーテルサル
ホン樹脂フィルム、ポリノルボルネンフィルムなどの環
状ポリオレフィン樹脂フィルムなどが挙げられ、その厚
みは通常３０〜２００μｍ程度である。積層には、通
常、透明で光学的に等方性の接着剤が用いられ、かかる
接着剤としては、例えばポリビニルアルコール系接着剤
が用いられる。The polarizing film thus obtained can be used as a polarizing plate by laminating a protective film on one or both sides thereof in the same manner as a normal polarizing film. As the protective film, for example, triacetyl cellulose, cellulose acetate resin film such as diacetyl cellulose, acrylic resin film, polyester resin film, polyarylate resin film, polyether sulfone resin film, cyclic polyolefin resin film such as polynorbornene film and the like. The thickness is usually about 30 to 200 μm. Usually, a transparent and optically isotropic adhesive is used for lamination, and as the adhesive, for example, a polyvinyl alcohol-based adhesive is used.
【００２２】かかる偏光板は、その表面にハードコート
層、反射防止層、防眩層などを有していてもよい。Such a polarizing plate may have a hard coat layer, an antireflection layer, an antiglare layer and the like on the surface.
【００２３】[0023]
【発明の効果】本発明の製造方法によれば、高温下で使
用しても所謂ヌケの少ない液晶表示装置を可能とする偏
光フィルムを製造することができる。According to the manufacturing method of the present invention, it is possible to manufacture a polarizing film which enables a liquid crystal display device with less so-called dropping even when used at a high temperature.
【００２４】[0024]
【実施例】以下、実施例により本発明をより詳細に説明
するが、本発明はかかる実施例に限定されるものではな
い。EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.
【００２５】実施例１ ポリビニルアルコールフィルム〔厚み７５μｍ、重合度
２４００、ケン化度９９．９％以上〕を乾式で一軸延伸
し〔延伸倍率５倍〕、緊張状態を保ったままヨウ素およ
びヨウ化カリウムを含有する水溶液〔水１００重量部あ
たりヨウ素を０．０５重量部、ヨウ化カリウムを５重量
部それぞれ含有する、２８℃〕に６０秒間浸漬した。次
いで、緊張状態に保ったまま、ホウ酸水溶液〔ホウ酸お
よびヨウ化カリウムを含有する水溶液、水１００重量部
あたりホウ酸を７．５重量部、ヨウ化カリウムを６重量
部それぞれ含有する、温度７３℃〕に３００秒間浸漬し
た。その後、純水（１５℃）で１０秒間水洗した。水洗
したフィルムに張力（単位幅あたりの張力は２０６Ｎ／
ｍ）を付与しながら９０℃で３００秒間乾燥し、偏光フ
ィルムを得た。乾燥処理の前後でのフィルムの延伸方向
の収縮率（Ｒ）は６％であった。Example 1 A polyvinyl alcohol film (thickness: 75 μm, degree of polymerization: 2400, degree of saponification: 99.9% or more) was monoaxially stretched in a dry system [stretching ratio: 5 times], and iodine and potassium iodide were kept in a tensioned state. Was immersed for 60 seconds in an aqueous solution (containing 0.05 parts by weight of iodine and 5 parts by weight of potassium iodide per 100 parts by weight of water, 28 ° C.). Then, while maintaining the tension, an aqueous solution of boric acid (an aqueous solution containing boric acid and potassium iodide, containing 7.5 parts by weight of boric acid and 6 parts by weight of potassium iodide per 100 parts by weight of water, temperature, 73 ° C.] for 300 seconds. Thereafter, the substrate was washed with pure water (15 ° C.) for 10 seconds. Tension on the washed film (tension per unit width is 206N /
Drying was performed at 90 ° C. for 300 seconds while applying m) to obtain a polarizing film. The shrinkage ratio (R) in the stretching direction of the film before and after the drying treatment was 6%.
【００２６】この偏光フィルムの両面にポリビニルアル
コール系接着剤を塗布し、保護フィルム（表面にケン化
処理を施したトリアセチルセルロースフィルム、「フジ
タックＵＶ８０」、富士写真フィルム（株）製）、厚み
８０μｍ〕を両面に貼合し、５０℃で５分乾燥して偏光
板とした。A polyvinyl alcohol-based adhesive is applied to both sides of the polarizing film, and a protective film (a triacetyl cellulose film having a saponified surface, "Fujitack UV80", manufactured by Fuji Photo Film Co., Ltd.), 80 μm thick ] On both sides and dried at 50 ° C. for 5 minutes to obtain a polarizing plate.
【００２７】この偏光板の片面にアクリル系粘着剤を塗
布し、その吸収軸が長辺に対して４５度となるように長
方形（２５０ｍｍ×１８０ｍｍ）に切り取った。この偏
光板２枚を透明なガラス板の両面にそれぞれクロスニコ
ルになるように貼合し、目視で観察した。ガラス板の両
面に偏光板を貼合した部分は均一に黒く見え、光漏れは
観察されなかった。この偏光板が貼合されたガラス板を
８０℃の乾熱条件下で５００時間放置した後、目視で観
察したところ、偏光板の各辺の中心付近の光漏れ（白ヌ
ケ）は比較的小さかった。An acrylic pressure-sensitive adhesive was applied to one surface of the polarizing plate, and cut into a rectangle (250 mm × 180 mm) such that the absorption axis was at 45 ° to the long side. The two polarizing plates were adhered to both sides of a transparent glass plate so as to form a cross Nicol, and observed visually. The portion where the polarizing plates were bonded to both sides of the glass plate appeared uniformly black, and no light leakage was observed. After the glass plate to which the polarizing plate was bonded was allowed to stand for 500 hours under a dry heat condition of 80 ° C., and visually observed, light leakage (white drop) near the center of each side of the polarizing plate was relatively small. Was.
【００２８】実施例２ 乾燥処理における単位幅当たりの張力（Ａ）を３０４Ｎ
／ｍ、温度（Ｂ）を８０℃とした以外は、実施例１と同
様に操作して偏光板を得た。乾燥処理におけるポリビニ
ルアルコール樹脂フィルムの延伸方向の収縮率（Ｒ）は
２．５％であった。Example 2 The tension (A) per unit width in the drying treatment was 304 N.
/ M and the temperature (B) were changed to 80 ° C. to obtain a polarizing plate. The shrinkage ratio (R) in the stretching direction of the polyvinyl alcohol resin film in the drying treatment was 2.5%.
【００２９】この偏光板を実施例１と同様にしてガラス
板の両面に貼合し、目視観察したところ、ガラス板の両
面に偏光板を貼合した部分は均一に黒く見え、光漏れは
観察されなかった。この偏光板が貼合されたガラス板を
８０℃の乾熱条件下で５００時間放置した後、目視で観
察したところ、偏光板の各辺の中心付近の光漏れ（白ヌ
ケ）は比較的小さかった。When this polarizing plate was bonded to both surfaces of the glass plate in the same manner as in Example 1, and visually observed, the portion where the polarizing plate was bonded to both surfaces of the glass plate appeared uniformly black, and light leakage was observed. Was not done. After the glass plate to which the polarizing plate was bonded was allowed to stand for 500 hours under a dry heat condition of 80 ° C., and visually observed, light leakage (white drop) near the center of each side of the polarizing plate was relatively small. Was.
【００３０】実施例３ 乾燥処理における単位幅当たりの張力（Ａ）を１０８Ｎ
／ｍ、温度（Ｂ）を７０℃とした以外は、実施例１と同
様に操作して偏光板を得た。乾燥処理におけるポリビニ
ルアルコール樹脂フィルムの延伸方向の収縮率（Ｒ）は
５％であった。Example 3 The tension (A) per unit width in the drying treatment was 108 N
/ M and the temperature (B) were changed to 70 ° C., and a polarizing plate was obtained in the same manner as in Example 1. The shrinkage ratio (R) in the stretching direction of the polyvinyl alcohol resin film in the drying treatment was 5%.
【００３１】この偏光板を実施例１と同様にしてガラス
板の両面に貼合し、目視観察したところ、ガラス板の両
面に偏光板を貼合した部分は均一に黒く見え、光漏れは
観察されなかった。この偏光板が貼合されたガラス板を
８０℃の乾熱条件下で５００時間放置した後、目視で観
察したところ、偏光板の各辺の中心付近の光漏れ（白ヌ
ケ）は比較的小さかった。When this polarizing plate was bonded to both surfaces of the glass plate in the same manner as in Example 1, and visually observed, the portion where the polarizing plate was bonded to both surfaces of the glass plate appeared uniformly black, and light leakage was observed. Was not done. After the glass plate to which the polarizing plate was bonded was allowed to stand for 500 hours under a dry heat condition of 80 ° C., and visually observed, light leakage (white drop) near the center of each side of the polarizing plate was relatively small. Was.
【００３２】比較例１ 乾燥処理における単位幅当たりの張力（Ａ）を３０４Ｎ
／ｍ、温度（Ｂ）を５０℃とした以外は、実施例１と同
様に操作して偏光板を得た。乾燥処理におけるポリビニ
ルアルコール樹脂フィルムの延伸方向の収縮率（Ｒ）は
１％であった。Comparative Example 1 The tension per unit width (A) in the drying treatment was 304 N.
/ M and the temperature (B) were changed to 50 ° C., and a polarizing plate was obtained in the same manner as in Example 1. The shrinkage (R) in the stretching direction of the polyvinyl alcohol resin film in the drying treatment was 1%.
【００３３】この偏光板を実施例１と同様にしてガラス
板の両面に貼合し、目視観察したところ、ガラス板の両
面に偏光板を貼合した部分は均一に黒く見え、光漏れは
観察されなかった。この偏光板が貼合されたガラス板を
８０℃の乾熱条件下で５００時間放置した後、目視で観
察したところ、偏光板の各辺の中心付近の光漏れ（白ヌ
ケ）は比較的大きかった。When this polarizing plate was bonded to both surfaces of the glass plate in the same manner as in Example 1, and visually observed, the portion where the polarizing plate was bonded to both surfaces of the glass plate appeared uniformly black, and light leakage was observed. Was not done. The glass plate to which the polarizing plate was bonded was left for 500 hours under a dry heat condition of 80 ° C., and was visually observed. As a result, light leakage (white drop) near the center of each side of the polarizing plate was relatively large. Was.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2H049 BA02 BA25 BA26 BB43 BC03 BC10 4F071 AA28 AA29 AA30 AA78 AB27 AE09 AF15 AG34 AH19 BB07 BB13 BC01 BC09 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H049 BA02 BA25 BA26 BB43 BC03 BC10 4F071 AA28 AA29 AA30 AA78 AB27 AE09 AF15 AG34 AH19 BB07 BB13 BC01 BC09
Claims (3)
れた一軸延伸ポリビニルアルコール樹脂フィルムを水洗
処理した後、張力を付与しながら乾燥処理して偏光フィ
ルムを製造する方法であり、乾燥処理における単位幅あ
たりの張力（Ａ）（単位はＮ／ｍ）と温度（Ｂ）（単位
は℃）とが不等式（１） Ａ ≦ ０．１２２５Ｂ2 − ９．９４７Ｂ ＋ ３７６．３２ （１） を満足する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, comprising washing a uniaxially stretched polyvinyl alcohol resin film dyed with a dichroic dye and treated with boric acid, followed by drying while applying tension to produce a polarizing film. The tension (A) (unit: N / m) and temperature (B) (unit: ° C.) per unit width in Equation (1) are given by the following inequality (1): A ≦ 0.1225B 2 −9.947B + 376.32 (1) A method for producing a polarizing film, characterized by satisfying.
コール樹脂フィルムを延伸方向に２％以上収縮させる請
求項１に記載の製造方法。2. The method according to claim 1, wherein the uniaxially stretched polyvinyl alcohol resin film is shrunk in the stretching direction by 2% or more in the drying treatment.
である請求項１に記載の製造方法。3. The method according to claim 1, wherein the temperature (B) in the drying treatment is 41 ° C. or higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35576099A JP2001174634A (en) | 1999-12-15 | 1999-12-15 | Method of producing polarizing film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35576099A JP2001174634A (en) | 1999-12-15 | 1999-12-15 | Method of producing polarizing film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001174634A true JP2001174634A (en) | 2001-06-29 |
Family
ID=18445621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35576099A Pending JP2001174634A (en) | 1999-12-15 | 1999-12-15 | Method of producing polarizing film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001174634A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003227927A (en) * | 2001-11-30 | 2003-08-15 | Fuji Photo Film Co Ltd | Polarizing film, polarizing plate, method for manufacturing polarizing film and liquid crystal display device |
| JP2005084506A (en) * | 2003-09-10 | 2005-03-31 | Sumitomo Chemical Co Ltd | Polarizing film and method for producing the same, polarizing plate and optical laminate |
| JP2006189560A (en) * | 2005-01-05 | 2006-07-20 | Sumitomo Chemical Co Ltd | Manufacturing method of polarizing film, polarizing plate and optical laminate |
| JP2006313205A (en) * | 2005-05-06 | 2006-11-16 | Nitto Denko Corp | Manufacturing method of polarizing plate, the polarizing plate obtained thereby, optical film and image display apparatus using the same |
| CN100388023C (en) * | 2003-09-10 | 2008-05-14 | 住友化学工业株式会社 | Polarizing film, manufacturing method thereof, polarizing plate, and optical laminate |
| KR100889717B1 (en) * | 2005-10-21 | 2009-03-23 | 닛토덴코 가부시키가이샤 | Polarizing plate attached with adhension type phase difference layer, method for producing the same, optical film and image display |
-
1999
- 1999-12-15 JP JP35576099A patent/JP2001174634A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003227927A (en) * | 2001-11-30 | 2003-08-15 | Fuji Photo Film Co Ltd | Polarizing film, polarizing plate, method for manufacturing polarizing film and liquid crystal display device |
| JP2005084506A (en) * | 2003-09-10 | 2005-03-31 | Sumitomo Chemical Co Ltd | Polarizing film and method for producing the same, polarizing plate and optical laminate |
| CN100388023C (en) * | 2003-09-10 | 2008-05-14 | 住友化学工业株式会社 | Polarizing film, manufacturing method thereof, polarizing plate, and optical laminate |
| CN100397110C (en) * | 2003-09-10 | 2008-06-25 | 住友化学工业株式会社 | Polarizing film, manufacturing method thereof, polarizer, and optical laminate |
| JP2006189560A (en) * | 2005-01-05 | 2006-07-20 | Sumitomo Chemical Co Ltd | Manufacturing method of polarizing film, polarizing plate and optical laminate |
| JP4581690B2 (en) * | 2005-01-05 | 2010-11-17 | 住友化学株式会社 | Manufacturing method of polarizing film |
| KR101226364B1 (en) * | 2005-01-05 | 2013-01-24 | 스미또모 가가꾸 가부시키가이샤 | Method for the production of polarized film, polarizing plate and optical laminate |
| TWI402157B (en) * | 2005-01-05 | 2013-07-21 | Sumitomo Chemical Co | A method for producing a polarizing film, a polarizing plate, and an optical laminate |
| JP2006313205A (en) * | 2005-05-06 | 2006-11-16 | Nitto Denko Corp | Manufacturing method of polarizing plate, the polarizing plate obtained thereby, optical film and image display apparatus using the same |
| WO2006120971A1 (en) * | 2005-05-06 | 2006-11-16 | Nitto Denko Corporation | Process for producing polarizing plate, polarizing plate produced by said process, and optical film and image display device using said polarizing plate |
| KR100889717B1 (en) * | 2005-10-21 | 2009-03-23 | 닛토덴코 가부시키가이샤 | Polarizing plate attached with adhension type phase difference layer, method for producing the same, optical film and image display |
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