JP5076308B2 - 水溶性色素並びにそれを用いた色素組成物、異方性色素膜及び偏光素子 - Google Patents
水溶性色素並びにそれを用いた色素組成物、異方性色素膜及び偏光素子 Download PDFInfo
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- JP5076308B2 JP5076308B2 JP2005342506A JP2005342506A JP5076308B2 JP 5076308 B2 JP5076308 B2 JP 5076308B2 JP 2005342506 A JP2005342506 A JP 2005342506A JP 2005342506 A JP2005342506 A JP 2005342506A JP 5076308 B2 JP5076308 B2 JP 5076308B2
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- JQRFOMXXFJIGMQ-UHFFFAOYSA-J tetrasodium;3-[[4-[[4-[(4,8-disulfonatonaphthalen-2-yl)diazenyl]-2-methoxy-5-methylphenyl]carbamoylamino]-5-methoxy-2-methylphenyl]diazenyl]naphthalene-1,5-disulfonate Chemical compound [Na+].[Na+].[Na+].[Na+].C1=CC=C(S([O-])(=O)=O)C2=CC(N=NC3=C(C)C=C(C(=C3)OC)NC(=O)NC3=CC(C)=C(N=NC=4C=C5C(=CC=CC5=C(C=4)S([O-])(=O)=O)S([O-])(=O)=O)C=C3OC)=CC(S([O-])(=O)=O)=C21 JQRFOMXXFJIGMQ-UHFFFAOYSA-J 0.000 description 1
- WNQPPENQFWLADQ-UHFFFAOYSA-J tetrasodium;4-hydroxy-5-[[4-[[4-[(8-hydroxy-3,6-disulfonatonaphthalen-1-yl)diazenyl]-2-methoxy-5-methylphenyl]carbamoylamino]-5-methoxy-2-methylphenyl]diazenyl]naphthalene-2,7-disulfonate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]S(=O)(=O)C1=CC(O)=C2C(N=NC3=C(C)C=C(C(=C3)OC)NC(=O)NC3=CC(C)=C(N=NC=4C5=C(O)C=C(C=C5C=C(C=4)S([O-])(=O)=O)S([O-])(=O)=O)C=C3OC)=CC(S([O-])(=O)=O)=CC2=C1 WNQPPENQFWLADQ-UHFFFAOYSA-J 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 125000004306 triazinyl group Chemical group 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 238000001429 visible spectrum Methods 0.000 description 1
Landscapes
- Polarising Elements (AREA)
- Quinoline Compounds (AREA)
Description
しかし、この技術によれば、得られる異方性色素膜の二色比は確かに向上するものの、より一層の二色比の向上を実現できる技術が求められていた。
A1は、カルボキシ基を置換基として有しているフェニル基を表わし、B1は、水酸基を置換基として有しているアルコキシ基と、アルキル基とを置換基として有しているフェニレン基を表わし、nは2を表わし、B1は、互いに同一でも、異なっていてもよい。)
する、偏光素子に存する(請求項2)。
本発明の水溶性色素は、濃度10ppmの水溶液の状態で測定した吸収スペクトルの主ピークの半値幅(以下適宜「10ppmの半値幅」と略称する。)に比して、濃度1000ppmの水溶液の状態で測定した吸収スペクトルの主ピークの半値幅(以下適宜「1000ppmの半値幅」と略称する。)の方が小さくなることを特徴とする。その半値幅の減少度合い{(10ppmの半値幅)−(1000ppmの半値幅)}としては、通常0.5nm以上、好ましくは1nm以上、より好ましくは2nm以上、更に好ましくは4nm以上である。但し、かかる用途に用いられる色素の10ppmといった希薄条件での吸収スペクトルの半値幅は、通常80〜300nm程度であり、かかる半値幅の減少度合いが50nm、とりわけ100nmを超えることは、色素の積層や秩序立った凝集といった本願の意図とは直接関係しない、何らかの電子状態の大きな変化によると思われるので、本願の趣旨と相容れるものではなく、好ましくない。
本発明の異方性色素膜は、上述した本発明の水溶性色素を少なくとも含有することを特徴とする。本発明の異方性色素膜は、本発明の水溶性色素のうち1種のみを単独で含有していてもよく、2種以上を任意の組み合わせ及び比率で含有していてもよい。
本発明の偏光素子は、本発明の異方性色素膜を少なくとも備えたことを特徴とする。本発明の異方性色素膜のみからなる偏光素子であってもよいし、適切な基板上に本発明の異方性色素膜が形成された偏光素子であってもよい。基板上に異方性色素膜を有する偏光素子は、基材も含めて偏光素子と呼ぶものとする。
なお、以下の記載において「部」とは、特に断らない限り「重量部」を示す。
表3のアゾ色素(1)11部及びグリセリン9部を水80部に攪拌溶解させ、色素組成物を得た。得られた色素組成物を、ギャップ30μmのアプリケーター(井元製作所社製)でスライドガラス(松浪硝子工業製「スライドグラス白縁磨フロストNo.1」)上に塗布した後、自然乾燥させることにより、異方性色素膜を得た。得られた異方性色素膜の二色比は74であった。
以下に示す色素(特許文献10に記載の例示色素(II−3))15部を水76部に撹拌溶解させた後、グリセリン9部を加えて色素組成物を得た。
上記表3のアゾ色素(1)10部を、水90部に攪拌溶解することにより、色素組成物を得た。得られた色素組成物を、実施例1と同様の手順によりスライドガラスに塗布し、自然乾燥することにより異方性色素膜を得た。得られた異方性色素膜の二色比は30であった。
比較例1で用いた色素(特許文献10に記載の例示色素(II−3))15部を、水85部に撹拌溶解させることにより、色素組成物を得た。得られた色素組成物を、比較例1と同様の手順により、ポリイミド配向膜が形成されたガラス製基板上に塗布し、自然乾燥することにより異方性色素膜を得た。得られた異方性色素膜の二色比は22.7であった。
実施例1と比較例1との比較、及び、実施例2と比較例2との比較から、本発明に規定する濃度と半値幅との関係を満たす水溶性色素を用いた実施例1及び実施例2では、上記関係を満たさない色素を用いた比較例1及び比較例2に比べ、より二色性に優れた異方性色素膜が得られることが分かる。
Claims (2)
- 請求項1に記載の異方性色素膜を少なくとも備えてなることを特徴とする、偏光素子。
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