| 摘要 |
PURPOSE: To improve the preservability of recording sensitivity and a recording image with the elapse of time and to reduce background fog by constituting a colorless or light-colored basic dye of 3-(N-ethyl-p-toluidino)-6-methyl-7- anilinofluorane and constituting a sensitizer of specific oxalic ester. CONSTITUTION: A colorless or light-colored basic dye is 3-(N-ethyl-p-toluidino)-6- methyl-7-anilinofluorane and a sensitizer is oxalic ester represented by R1 - OOC-COO-R2 (wherein R1 and R2 are a phenol or benzyl group which may have a halogen atom, a 1-4C alkyl group or a 1-4C alkyl group as a substituent or a cyclohexyl group which may have a 1-4C alkyl group as a substituent and may be same or differnet). By this constitution, recording sensitivity and the preservability of a recording image are improved and background fog can be reduced. |
