WO2005015275A1 - 染料系偏光板 - Google Patents
染料系偏光板 Download PDFInfo
- Publication number
- WO2005015275A1 WO2005015275A1 PCT/JP2004/011340 JP2004011340W WO2005015275A1 WO 2005015275 A1 WO2005015275 A1 WO 2005015275A1 JP 2004011340 W JP2004011340 W JP 2004011340W WO 2005015275 A1 WO2005015275 A1 WO 2005015275A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- film
- dye
- polarizing
- polarizing film
- formula
- 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.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3016—Polarising elements involving passive liquid crystal elements
Definitions
- the present invention relates to a dye-based polarizing plate comprising a high-purity azo compound-based water-soluble dye or a salt thereof.
- a polarizing plate having a function of transmitting and shielding light is a basic component of a liquid crystal display (LCD) together with a liquid crystal having a function of switching light.
- LCD liquid crystal display
- the field of application of LCDs is wide ranging from small devices such as calculators and watches in the early days, to notebook computers, word processors, liquid crystal projectors, liquid crystal televisions, car navigation systems, and indoor and outdoor measuring instruments.
- a polarizing plate for the ultraviolet region (400 nm or less) is used for a spectrophotometer such as a fluorescence spectrophotometer, an exposure device for irradiating ultraviolet light, and the like.
- a spectrophotometer such as a fluorescence spectrophotometer, an exposure device for irradiating ultraviolet light, and the like.
- a liquid crystal display device having a fluorescent layer that emits light by the action of near-ultraviolet light hereinafter, referred to as a photo display.
- a luminescent liquid crystal display device can be used as a polarizing plate.
- a polarizing film is applied to a polarizing film substrate such as a film of stretch-oriented polybutyl alcohol or a derivative thereof, and iodine or a dichroic dye is used as a polarizing element.
- a polyene-based film in which polyene is generated and oriented by de-acidification of a polychlorinated butyl film or dehydration of a polybutyl alcohol-based film.
- an iodine-based polarizing film using iodine as a polarizing element has excellent initial polarization performance in the visible light region, but has very poor polarization performance in the near-ultraviolet region, and is inferior to water.
- an iodine-based polarizing film using iodine as a polarizing element has excellent initial polarization performance in the visible light region, but has very poor polarization performance in the near-ultraviolet region, and is inferior to water.
- a problem in its durability when used for a long time in a high-temperature, high-humidity state that is weak against heat, there is a problem in its durability. In order to improve the durability, treatment with an aqueous solution containing formalin or boric acid, and a method using a polymer film having low moisture permeability as a protective film have been considered, but this is not sufficient.
- a dichroic dye Although the dye-based polarizing films using these have excellent moisture resistance and heat resistance
- Dyes used in the production of the dye-based polarizing film as described above include water-soluble compounds described in Patent Documents 1 and 2, and the like. There is a demand for an improvement in which one having good durability can be obtained.
- Patent Document 1 JP 2002-357719 A
- Patent Document 2 JP 2003-35819 A
- Patent Document 3 JP-A-54-153648
- Patent Document 4 Japanese Patent No. 1854685
- Patent Document 5 Patent No. 2622748
- Patent Document 6 JP-A-1-252904
- Patent Document 7 JP 2001-27708 A
- Patent Document 8 JP 2001-33627 A
- Non-Patent Document 1 W.A.Crosland and 2 others Journal of the SID 6/2, 1998 ppl 17-124
- Non-patent document 2 W.A.Crosland et al. 1 person SID 97 Digest pp837_840
- Non-patent document 3 S.L.Njo et al. 3 people SID 00 Digest pp343_345
- An object of the present invention is to provide a high-performance polarizing plate having excellent polarization performance and excellent moisture resistance and heat resistance in the visible light region and the ultraviolet region where the influence of by-products contained in the dye is small. It is to be.
- the present inventors have conducted intensive studies to achieve the object, and as a result, have found that a polarizing film and a polarizing plate containing a high-purity dye have excellent polarizing performance, moisture resistance, and heat resistance. Heading, the present invention has been completed.
- Rl and R2 represent a hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxyl group or a carboxy group
- R3 and R4 represent a hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxyl group or a hydroxyl group.
- X represents ⁇ , S, NH or NCH.
- 1, m represents 0, 1 or 2, and l + m> 0.
- a polarizing plate characterized in that a film having a transmittance at 380 nm of 70% or more is bonded to at least one surface of the near-ultraviolet polarizing film according to (1).
- the polarizing film of the present invention shows a remarkable improvement in polarization characteristics as compared with a polarizing film containing an azo compound produced by a conventional production method. Further, the polarizing plate of the present invention has high polarization performance even in the near ultraviolet region and is excellent in durability, so that it is suitable for display applications of photoluminescence liquid crystal display devices and industrial instruments used in various environments. is there.
- the polarizing film of the present invention contains a high purity product of 90% or more of the azo compound represented by the formula (1) or a salt thereof.
- Rl and R2 represent a hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxyl group or a carboxy group
- R3 and R4 represent a hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxyl group or X represents a hydroxyl group
- X represents ⁇ , S, NH or NCH.
- 1 and m represent 0, 1 or 2
- the high-purity azo compound represented by the formula (1) or a salt thereof is subjected to oxidative coupling by treating the amino conjugate represented by the general formula (2) with manganese dioxide as an oxidizing agent. Is obtained.
- the salt include an alkali metal salt such as a lithium salt, a sodium salt and a potassium salt, an ammonium salt and an organic amine salt.
- an alkali metal salt such as a lithium salt, a sodium salt and a potassium salt
- an ammonium salt such as sodium salt and an organic amine salt.
- dyeing a polarizing film it is preferable to use a sodium salt or a potassium salt.
- the substrate (polymer film) used for the polarizing film of the present invention may be a polyvinyl alcohol-based substrate, which is preferably a polyvinyl alcohol-based substrate, or polybutyl alcohol or a derivative thereof, or any of these.
- examples thereof include those modified with olefins such as ethylene and propylene, and unsaturated carboxylic acids such as crotonic acid, acrylic acid, methacrylic acid, and maleic acid.
- a film made of polybutyl alcohol or a derivative thereof is suitably used from the viewpoint of dye adsorption and orientation.
- the compound represented by the formula (1) or a salt thereof of the present invention can be used alone or, if necessary, mixed with another organic dye having a polarizing property in the visible light region.
- a polarizing film having high polarization characteristics can be manufactured.
- any dyes having absorption characteristics in a wavelength region different from the absorption wavelength region of the compound of the formula (1) of the present invention and having high dichroism can be used.
- a method of dyeing a polymer film is usually employed. Staining is performed, for example, as follows. First, a water-soluble dye is dissolved in water to prepare a dye bath. The concentration of the dye in the dye bath is not particularly limited, but is usually selected from the range of about 0.001 10% by weight. If necessary, a dyeing aid may be used. For example, it is preferable to use sodium sulfate at a concentration of about 0.110% by weight. The polymer film is immersed in the dyeing bath adjusted in this way to perform dyeing. The dyeing temperature is preferably about 40-80 ° C, more preferably 70 ° C and 80 ° C.
- Orientation of the water-soluble dye is performed by stretching the dyed polymer film.
- a stretching method any known method such as a wet method and a dry method may be used. Stretching of the polymer film may optionally be performed before dyeing. In this case, the water-soluble dye is oriented at the time of dyeing.
- the polymer film containing the water-soluble dye and oriented is subjected to post-treatment such as boric acid treatment by a known method as necessary. Such a post-treatment is performed for the purpose of improving the light transmittance and the degree of polarization of the polarizing film.
- the conditions of the boric acid treatment vary depending on the type of the polymer film used and the type of the dye used, but generally the boric acid concentration of the aqueous boric acid solution is 0.1 to 15% by weight, preferably 1 to 10% by weight.
- the treatment is carried out in a temperature range of 30-80 ° C, preferably 40-75 ° C. Further, if necessary, the aqueous solution containing the cationic polymer compound may be subjected to the phytostat treatment.
- the polarizing film obtained by the present invention is used as a polarizing plate with a protective film and as a polarizing plate for a spectrophotometer such as a fluorescence spectrophotometer and a photoluminescence liquid crystal display device.
- a spectrophotometer such as a fluorescence spectrophotometer and a photoluminescence liquid crystal display device.
- Including a polymer film together with another organic dye having a polarization property in the visible light region in this manner is suitable for inspecting defects such as disorder in the alignment of the LCD.
- the dye-based polarizing film thus obtained is provided with a protective film having excellent optical transparency and mechanical strength on one or both surfaces thereof, such as a polyvinyl alcohol-based or isocyanate-based protective film.
- a polarizing plate can be obtained by laminating with an adhesive.
- the material for forming the protective film may be any of those conventionally used, for example, a fluorine-based material such as a cellulose acetate-based film or an acrylic film, such as a tetrafluoroethylene / propylene hexafluoride copolymer.
- a film made of a film, a polyester resin, a polyolefin resin or a polyamide resin is used.
- the protective film used here needs to have a transmittance at 380 nm of 70% or more, and preferably has a transmittance of 80% or more.
- the surface of the polarizing plate of the present invention may be provided with a layer further subjected to an antireflection treatment, an antiglare treatment, an antistatic treatment, a corona treatment, and a hard coat treatment.
- the dye-based polarizing plate thus configured is excellent in polarization performance, does not undergo discoloration or deterioration in polarization performance even in a high-temperature and high-humidity state, and leaks in the orthogonal position in the visible light and near ultraviolet regions. It has the characteristic of being blue.
- Manganese dioxide (powder, manufactured by Junsei Chemical Co., Ltd.) in an aqueous solution in which 2_ (4-aminophenyl) _6_methylbenzothiazolone 7-sulfonic acid (purity: 78.3%) is dissolved in 260 parts of water. Add 350 parts of calorie, then add 200 parts of a 10% aqueous potassium permanganate solution to complete the oxidation coupling. Sodium thiosulfate was added to remove excess permanganate, and manganese dioxide was filtered off. The obtained filtrate was salted out with sodium salt and filtered to obtain 13.7 parts of a salt of the azo compound represented by the above formula (4).
- the maximum absorption wavelength in water of the azo compound (4) prepared in Synthesis Example 1 was 389 nm.
- the purity of the azo compound of formula (4) was determined by high-performance chromatography using high-performance liquid chromatography. The purity was 97%, and no azine compound represented by the formula (6) was detected. [0034] [Formula 06]
- the maximum absorption wavelength of an aqueous solution of Solophenyl Yellow F FL (manufactured by Ciba-Geigy), which is generally commercially available as C.I. Direct Yellow 28, was 395 nm. Further, the purity of the azo compound of the formula (4) was determined to be 64% by high performance liquid chromatography using high performance liquid chromatography, and there was 27% of an azine compound as a by-product.
- the film was stretched 5 times at 50 ° C in a 3% aqueous solution of boric acid, washed with water while keeping the tension, and dried to obtain a polarizing film.
- the maximum absorption wavelength of the obtained polarizing film was 417 nm, and the polarizing ratio was 97.65% when the single plate transmittance was 43.75%.
- a TAC film (trade name: Fujitac T80SZ, manufactured by Fuji Photo Film Co., Ltd.) is adhered to both sides of this polarizing film using PVA-based adhesive, and the polarizing plate produced can be used for a long time even at high temperature and high humidity. It showed durability.
- the concentration of a mixture mainly composed of the compound represented by the following formula (7) described in Patent Document 2 and Example 1 was set at 0.5% and 0.1% of sodium sulfate.
- Polyvinyl alcohol (trade name: VF-XS # 7500, made of Kuraray clay) having a thickness of 75 ⁇ m was immersed in an aqueous solution of ° C for 4 minutes. This film was stretched 5 times in a 3% aqueous solution of boric acid at 50 ° C., washed with water while keeping the tension, and dried to obtain a polarizing film.
- the orthogonal transmittance of the obtained polarizing film at 365 nm was 1.2%.
- the polarizing film for near-ultraviolet light of the present invention has high polarization performance in the near-ultraviolet region and is also excellent in durability, so that it can be used in photoluminescent liquid crystal display devices and displays of industrial instruments used in various environments. Suitable for use.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Polarising Elements (AREA)
- Paints Or Removers (AREA)
- Liquid Crystal (AREA)
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| HK06113312.8A HK1092877B (en) | 2003-08-07 | 2004-08-06 | Dye-containing polarizer |
| JP2005512967A JPWO2005015275A1 (ja) | 2003-08-07 | 2004-08-06 | 染料系偏光板 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003288832 | 2003-08-07 | ||
| JP2003-288832 | 2003-08-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2005015275A1 true WO2005015275A1 (ja) | 2005-02-17 |
Family
ID=34131531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2004/011340 Ceased WO2005015275A1 (ja) | 2003-08-07 | 2004-08-06 | 染料系偏光板 |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPWO2005015275A1 (ja) |
| KR (1) | KR101013291B1 (ja) |
| CN (1) | CN100380146C (ja) |
| TW (1) | TWI237134B (ja) |
| WO (1) | WO2005015275A1 (ja) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008175565A (ja) * | 2007-01-16 | 2008-07-31 | Fujifilm Corp | 光透過性部材の欠陥検出装置及び方法 |
| WO2015083673A1 (ja) * | 2013-12-02 | 2015-06-11 | 日本化薬株式会社 | 各波長で均一な透過率を有する高コントラストな偏光素子および偏光板 |
| WO2017090356A1 (ja) * | 2015-11-27 | 2017-06-01 | 株式会社ポラテクノ | 液晶表示装置 |
| US9964688B2 (en) | 2015-11-13 | 2018-05-08 | Japan Display Inc. | Liquid crystal display device |
| WO2019013144A1 (ja) * | 2017-07-14 | 2019-01-17 | シャープ株式会社 | 偏光紫外線照射装置、光配向膜の製造方法、位相差層の製造方法、及び、液晶表示装置の製造方法 |
| US11802208B2 (en) | 2017-07-28 | 2023-10-31 | Nippon Kayaku Kabushiki Kaisha | Stilbene-based compound or salt thereof, and polarizing film, polarizing plate, and display device |
| WO2024143252A1 (ja) * | 2022-12-27 | 2024-07-04 | 日本化薬株式会社 | 偏光板、それを用いた液晶パネル及び光造形装置 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2983020A4 (en) * | 2013-04-03 | 2016-11-30 | Nippon Kayaku Kk | ACHROMATIC DYE-BASED HIGH-PERM POLARIZATION ELEMENT AND POLARIZATION PLATE |
| WO2014162633A1 (ja) * | 2013-04-03 | 2014-10-09 | 日本化薬株式会社 | 無彩色な偏光素子、及び偏光板 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54153648A (en) * | 1978-05-24 | 1979-12-04 | Citizen Watch Co Ltd | Color polarizing film |
| JPS6470702A (en) * | 1987-09-11 | 1989-03-16 | Nippon Kayaku Kk | Production of polarizing film |
| JP2003313449A (ja) * | 2002-04-18 | 2003-11-06 | Nippon Kayaku Co Ltd | 4,4’−ジ(2−ベンゾチアゾリル)アゾベンゼン誘導体の製造方法 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2023301A (en) * | 1978-05-24 | 1979-12-28 | Citizen Watch Co Ltd | Colour polarizing film containing a dichroic dye, especially for use with liquid crystal display devices |
| US5272259A (en) * | 1988-12-23 | 1993-12-21 | Bayer Aktiengesellschaft | Stilbene dyestuffs and light-polarizing films or sheets containing stilbene |
| NL1020245C2 (nl) * | 2001-03-28 | 2002-10-30 | Sumitomo Chemical Co | Polarisatiefilm die een monoazo verbinding of zout daarvan bevat. |
-
2004
- 2004-08-06 JP JP2005512967A patent/JPWO2005015275A1/ja active Pending
- 2004-08-06 KR KR1020067002462A patent/KR101013291B1/ko not_active Expired - Fee Related
- 2004-08-06 CN CNB2004800226981A patent/CN100380146C/zh not_active Expired - Lifetime
- 2004-08-06 TW TW093123579A patent/TWI237134B/zh not_active IP Right Cessation
- 2004-08-06 WO PCT/JP2004/011340 patent/WO2005015275A1/ja not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54153648A (en) * | 1978-05-24 | 1979-12-04 | Citizen Watch Co Ltd | Color polarizing film |
| JPS6470702A (en) * | 1987-09-11 | 1989-03-16 | Nippon Kayaku Kk | Production of polarizing film |
| JP2003313449A (ja) * | 2002-04-18 | 2003-11-06 | Nippon Kayaku Co Ltd | 4,4’−ジ(2−ベンゾチアゾリル)アゾベンゼン誘導体の製造方法 |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008175565A (ja) * | 2007-01-16 | 2008-07-31 | Fujifilm Corp | 光透過性部材の欠陥検出装置及び方法 |
| WO2015083673A1 (ja) * | 2013-12-02 | 2015-06-11 | 日本化薬株式会社 | 各波長で均一な透過率を有する高コントラストな偏光素子および偏光板 |
| JPWO2015083673A1 (ja) * | 2013-12-02 | 2017-03-16 | 日本化薬株式会社 | 各波長で均一な透過率を有する高コントラストな偏光素子および偏光板 |
| US9964688B2 (en) | 2015-11-13 | 2018-05-08 | Japan Display Inc. | Liquid crystal display device |
| WO2017090356A1 (ja) * | 2015-11-27 | 2017-06-01 | 株式会社ポラテクノ | 液晶表示装置 |
| JP2017097251A (ja) * | 2015-11-27 | 2017-06-01 | 株式会社ポラテクノ | 液晶表示装置 |
| WO2019013144A1 (ja) * | 2017-07-14 | 2019-01-17 | シャープ株式会社 | 偏光紫外線照射装置、光配向膜の製造方法、位相差層の製造方法、及び、液晶表示装置の製造方法 |
| US11802208B2 (en) | 2017-07-28 | 2023-10-31 | Nippon Kayaku Kabushiki Kaisha | Stilbene-based compound or salt thereof, and polarizing film, polarizing plate, and display device |
| WO2024143252A1 (ja) * | 2022-12-27 | 2024-07-04 | 日本化薬株式会社 | 偏光板、それを用いた液晶パネル及び光造形装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| HK1092877A1 (zh) | 2007-02-16 |
| TW200506423A (en) | 2005-02-16 |
| TWI237134B (en) | 2005-08-01 |
| KR101013291B1 (ko) | 2011-02-09 |
| CN1833186A (zh) | 2006-09-13 |
| CN100380146C (zh) | 2008-04-09 |
| JPWO2005015275A1 (ja) | 2007-09-27 |
| KR20060037426A (ko) | 2006-05-03 |
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