| 摘要 |
PURPOSE:To provide a fluoran compound having excellent properties required as a color-developing agent for recording material. CONSTITUTION:beta-Crystal transformation of 2-(3-methylanilino)-3-methyl-6- diethylaminofluoran characterized by the X-ray diffraction pattern having characteristic peaks at diffraction angles (2theta + or -0.2 deg.) of 7.6 deg., 12.2 deg., 14.9 deg., 15.9 deg., 17.6 deg. and 22.8 deg. by powder X-ray diffraction with CU-Kalpha ray and having a melting point between 186 deg.C and 191 deg.C, its production process and a recording material containing the crystal transformation as an electron-donative color-developing agent. The fluoran compound has excellent solubility in a solvent for capsule and the recording material produced by using the fluoran compound has excellent highlight whiteness, highlight stability, developed color tone, color-developing sensitivity, image fastness, etc. |
