| 摘要 |
PURPOSE:To obtain a near infrared absorber which comprises a naphthalocyanine coloring material with a specific structure and has a low tendency to associate, a high molar extinction coefficient, a high solubility in a resin or in a liq. crystal, and high absorption and display characteristics. CONSTITUTION:A near infrared absorber of the formula [wherein A<1>-A<8> are each H, halogen, (substd.) alkyl, aryl, alkoxy, aryloxy, alkylthio, or arylthio, and in each group consisting of A<1> and A<2>, A<3> and A<4>, A<5> and A<6>, or A<7> and A<8>, both are not simultaneously H or halogen; Y<1>-Y<16> are each H, halogen, (substd.) alkyl, aryl, alkoxy, aryloxy, alkylthio, arylthio, alkylamino, OH, SH, NO2, alkoxycarbonyl, aminocarbonyl, etc., and Met represent two hydrogen atoms, a divalent metal atom, or a tri- or tetravalent substd. metal atom]. Having a low tendency to associate, a high molar extinction coefficient, a high solubility in a resin or in a liq. crystal and high light absorption and display characteristics, the absorber can give an optical recording medium, filter, and liq. crystal display element with a high reflectance and sensitivity. |
