| abstract |
PURPOSE:The titled composition, containing a spirooxazine based compound and a phenolic compound as active ingredients, capable of giving a colored state stable even at high temperatures, having good contrast and providing a high coloring density and useful for recording memorizing material, etc. CONSTITUTION:A composition containing a spirooxazine based compound expressed by formula I (R<1> and R<2> are alkyl, allyl, aryl or aralkyl; ring A and ring B are benzene ring, naphthalene ring or heterocyclic ring which may be substituted; X is O or S), preferably a compound expressed by formula II (n is 1-4; R<2> and R<3> are alkyl; R<4>, R<5>, R<6> and R<7> are H, halogen, alkyl, etc.; Y is CH or N) and a phenolic compound, preferably a compound expressed by formula III or IV (Z is O, S, etc.; m is 0 or 1; X<1>-X<8> are H, halogen, etc.; Y<1>-Y<5> are hydrocarbon group, halogen, etc.) as active ingredients. The amount of the phenolic compound to be added is preferably within the range of 3-50wt% based on the dyestuff. |