| abstract |
PURPOSE: To color an organic material such as synthetic resin in excellent heat-resistance, clarity and transparency by using a specific dye. n CONSTITUTION: An organic material is colored with a dye expressed by formula I (ring A is benzene ring or naphthalene ring; R 1 -R 3 are H, halogen, lower alkyl, lower alkoxy, phenyl, benzoyl, acyl, nitro or amino). The dye of formula I can be produced by reacting a quinophthalone dye of formula II with N- hydroxy-methylphthalimide or its derivative. n COPYRIGHT: (C)1990,JPO&Japio |