Recording material

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1980-11-26

1982-05-18

Milestone, Norma S.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D49310

Patent

active

043304737

ABSTRACT:
The present invention discloses novel fluoran compound useful as the lactone electron donative color-forming agents having the general formula: ##STR1## wherein, R.sub.1, R.sub.2 and R.sub.4 are respectively hydrogen, methyl or ethyl groups; R.sub.3 is hydrogen or a methyl group; and R.sub.5 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.

REFERENCES:
patent: 3669711 (1972-06-01), Kimura et al.
patent: 3721576 (1973-03-01), Farber et al.
patent: 3746562 (1973-07-01), Lin
patent: 3873573 (1975-03-01), Farber et al.

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