Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1974-10-01
1977-05-17
Milestone, Norma S.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
282 275, 428488, 26032634, 26029358, 2602475H, 260240R, C07D49310
Patent
active
040241572
ABSTRACT:
A fluoran compound represented by the formula, ##STR1## WHEREIN R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each hydrogen, substituted or unsubstituted lower alkyl, lower alkenyl, or lower alkynyl, ##STR2## GROUP (WHEREIN X is hydrogen, halogen, lower alkyl, lower alkoxy, di-lower alkylamino or --COOR.sub.a group in which R.sub.a is lower alkyl, and l is an intger of 1 to 4), or R.sub.1 and R.sub.2, or R.sub.3 and R.sub.4, taken together, may form a heterocyclic ring; Y is the same atom or group as X but independent of X; D is a benzene or naphthalene nucleus; Z is hydrogen or halogen; and m and n are each an integer of 1 to 4, is useful as a coloring material for record material systems such as pressure-sensitive copying paper or heat-sensitive copying paper, wherein colored images are formed by an electron donor-accepter and color-forming reaction between a coloring material and an acidic material.
REFERENCES:
patent: 2031023 (1936-02-01), Wyler
patent: 3864145 (1975-02-01), Seki et al.
patent: 3947471 (1976-03-01), Akamatsu et al.
Chemical Abstracts, vol. 79, (1973), abstracting Ger.Offen. 2,253,161, 43672u.
Hotta Seiji
Ito Yukiaki
Milestone Norma S.
Sumitomo Chemical Company Limited
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