Fluoran compounds

Details Fluoran compounds Fluoran compounds

1979-11-09

1981-11-24

Hess, Bruce H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

282 275, 427151, 428307, 428913, 428914, C07D31186, B41M 516, B41M 518, B41M 522

Patent

active

043023932

ABSTRACT:
Fluoran compounds of the formula ##STR1## wherein one of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represents n-alkyl having 6 to 12 carbon atoms and the other R's, independently of each other, represent hydrogen, alkyl having 1 to 12 carbon atoms, alkoxyalkyl having 2 to 8 carbon atoms or benzyl optionally substituted in the ring by nitro, halogen or alkyl having 1 to 6 carbon atoms.
The fluoran compounds are particularly useful as color formers which give intense dark green color when they are brought into contact with an electron-accepting co-reactant.

REFERENCES:
patent: 3501331 (1970-03-01), Kimura et al.
patent: 3669711 (1972-06-01), Kimura et al.
patent: 3825432 (1974-07-01), Futaki et al.

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