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    COMPOSITION FOR LIQUID CRYSTAL DISPLAY
    5.
    发明专利
    COMPOSITION FOR LIQUID CRYSTAL DISPLAY 失效

    公开(公告)号：JPS57198777A

    公开(公告)日：1982-12-06

    申请号：JP8245281

    申请日：1981-06-01

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： YAMADA YASUYUKI ,  TANAKA TADAAKI ,  TSUKAHARA RIYOUICHI ,  NISHIZAWA ISAO

    IPC: C09K19/60 ,  C09B1/54 ,  G02F1/137 ,  G09F9/00 ,  G09F9/35

    Abstract: PURPOSE:To provide a composition for a liquid crystal color display, having excellent light resistance, and exhibiting clear reddish violet color and extremely good dichroism, by dissolving a dichroic dye composed of an anthraquinone compound having a specific structural formula in a liquid crystal. CONSTITUTION:The objective composition is obtained by dissolving (A) a dichroic dye composed of an anthraquinone compound of formula (R1 is amino or OH; R2 and R3 are H, amino, OH, nitro, etc.; Alk is halogen, cyano, phenyl, etc.; R4 is H, halogen, 1-4C alkyl, or Alk; x is halogen or 1-4C alkyl; m is 1 or 2; n is 0, 1 or 2; m+n>=2) (preferably the compound wherein R1 is amino, R2, R3 and R4 are H, and Alk is alkyl) in (B) a liquid crystal (e.g. a nematic liquid crystal composed of a mixture of 43% 4-cyano-4'-n-pentylbipheyl, 17% 4-cyano-4'-n-propoxybiphenyl, etc.). The concentration of the dye in the liquid crystal is preferably 0.01-5%.

    COMPOSITION FOR LIQUID CRYSTAL COLOR DISPLAY
    6.
    发明专利
    COMPOSITION FOR LIQUID CRYSTAL COLOR DISPLAY 失效

    公开(公告)号：JPS57198776A

    公开(公告)日：1982-12-06

    申请号：JP8245181

    申请日：1981-06-01

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： YAMADA YASUYUKI ,  TANAKA TADAAKI ,  TSUKAHARA RIYOUICHI ,  NISHIZAWA ISAO

    IPC: C09K19/60 ,  G02F1/137 ,  G09F9/00 ,  G09F9/35

    Abstract: PURPOSE:To provide a composition for liquid crystal color display, having excellent light resistance, and exhibiting clear orange-blue color and extremely good dichroism, by dissolving a dichroic dye composed of an anthraquinone compound having a specific structural formula in a liquid crystal. CONSTITUTION:The objective composition is obtained by dissolving (A) a dichroic dye composed of an anthraquinone compound of formula (R1-R3 are H, amino, OH, nitro or halogen; AlK is halogen, cyano, OH, phenyl, etc.; R4 is H, halogen, cyano, OH, 1-4C alkyl or Alk; X is halogen or 1-4C alkyl; m is 1 or 2; n is 0, 1 or 2) in (B) a liquid crystal (e.g. a nematic liquid crystal composed of a mixture of 43% 4-cyano-4'-n-pentylbiphenyl, 17% 4-cyano-4'-n- propoxybiphenyl, 13% 4-cyano-4'-n-pentoxybiphenyl, etc.). The concentration of the dye in the liquid crystal is preferably 0.01-5%.

    LIQUID CRYSTAL COMPOSITION FOR COLOR DISPLAY
    7.
    发明专利
    LIQUID CRYSTAL COMPOSITION FOR COLOR DISPLAY 失效

    公开(公告)号：JPS5792079A

    公开(公告)日：1982-06-08

    申请号：JP16680180

    申请日：1980-11-28

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： YAMADA YASUYUKI ,  TSUKAHARA RIYOUICHI ,  NISHIZAWA ISAO ,  TANAKA TADAAKI

    IPC: C09K19/60 ,  G02F1/137 ,  G09F9/00 ,  G09F9/35

    Abstract: PURPOSE:The titled composition that is made by dissolving an anthraquinonecarboxylic ester of a specific structure in a liquid crystal as a dichromatic dye, thus developing bright red to blue color and showing good dichromatic property with high light resistance. CONSTITUTION:The objective composition is prepared by dissolving an anthraquinonecarboxylic ester of the formula[X is H, amino, hydroxyl, halogen; R is cyclohexyl, phnyl, biphenyl substitutable with halogen, alkylalkoxy, -Alk-Y (Al is 1-15C alkylene; Y is 1-15C alkoxy, nitrile, H, phenyl substitutable with 1-14C lower alkyl or nitrile], e.g., obtained by esterification of 1,4-diaminoanthraquinone-4-carboxylic acid with an alcohol of R-OH, in a liquid crystal, preferably by 0.01-5% as a dichromatic dye to produce the objective composition.

    PREPARATION OF 11AMINOO22BROMOO44HYDROXYANTHRAQUINONE
    8.
    发明专利
    PREPARATION OF 11AMINOO22BROMOO44HYDROXYANTHRAQUINONE 失效

    公开(公告)号：JPS56123955A

    公开(公告)日：1981-09-29

    申请号：JP2734280

    申请日：1980-03-06

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： IWAMURA AKIO ,  TANAKA TADAAKI

    IPC: C07C225/36

    Abstract: PURPOSE:To obtain the titled compound useful as an intermediate for a dye in high purity in a short time, by brominating 1-aminoanthraquinone in sulfuric acid in the presence of boric acid, adjusting the amount of the sulfuric acid if necessary, and then hydrolyzing the reaction product. CONSTITUTION:One mole 1-aminoanthraquinone is reacted with bromine in the presence of 0.5-5mol boric acid in sulfuric acid to give 1-amino-2,4-dibromoanthraquinone. The reaction is carried out in the sulfuric acid or fuming sulfuric acid in an amount of 2-10 times that of the 1-aminoanthraquinone at 60-70 deg.C. The amount and/or the concentration of the sulfuric acid are adjusted if necessary, and the reaction mixture is heated while recovering the excess bromine by distillation, and then hydrolyzed at 100-140 deg.C to give the titled compound. The addition of the boric acid to be used for the hydrolysis from the initial period of the reaction permits the reduction of the bromination reaction time and the inhibition of the formation of impurities as a by-product.

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