| 摘要 |
NEW MATERIAL:A compound shown by the formula I [at least one of R1-R4 is alkyl, or cyclohexyl, and the rest is H, 1-4C alkyl, (halogen, etc.-substituted) aralkyl, (halogen, etc.-substituted) aryl, or R1, R2, and neighboring N are linked to form pyrrolidino, piperidino, or hexamethyleneimino]. EXAMPLE:3-i-Propyl-8-N-ethyl-N-n-hexylamino-benzo[a]fluoran. USE:Having improved light resistance of blue black - black coloring substance of pressure-sensitive, heat-sensitive, or electricity-sensitive recording paper. Having low fog on the surface of paper. PREPARATION:An m-substituted aminophenol derivative shown by the formula III is reacted with phthalic anhydride shown by the formula IV to give a 2-(2-hydroxy-4-substituted amino)benzoylbenzoic acid derivative shown by the formula V. This compound is condensed with a 2-amino-6-naphthol derivative shown by the formula VI. |
