| 摘要 |
PURPOSE:To obtain a color forming recording material capable of forming a green or dark-green color and highly valuable as a recording material for a pressure-sensitive copying paper, by incorporating a specified fluoran compound as a colorless substance capable of performing a color reaction. CONSTITUTION:A novel fluoran compound of the formula, wherein R1 is a 1-5C alkyl, and R2 is a 6-12C alkyl, is substatially colorless per se, is highly soluble in organic solvents such as diarylethane, alkylnaphthalene, hydrogenated terphenyl and alkylbiphenyl, and forms a developed color image which displays excellent stability to light. At least one such fluoran compound may be used either singly or in combination, and may be used in combination with other recording material for a pressure-sensitive copying paper. |
