41317-14-0Relevant articles and documents
Recording material
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, (2008/06/13)
The present invention discloses novel fluoran compound useful as the lactone electron donative color-forming agents having the general formula: STR1 wherein, R1, R2 and R4 are respectively hydrogen, methyl or ethyl groups; R3 is hydrogen or a methyl group; and R5 is a phenyl group or a phenyl group substituted with from one to five methyl groups. The compound of the invention is soluble in aromatic solvents as well as in aromatic-aliphatic mixed solvents and also has excellent light fastness after developing color.