Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1974-07-23
1976-07-20
Milestone, Norma S.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
282 275, 428488, C07D49310
Patent
active
039706710
ABSTRACT:
Chromogenic compounds for use in pressure sensitive recording sheets represented by the formula: ##SPC1##
Are disclosed, wherein R.sub.1 and R.sub.2 are independently, hydrogen substituted or unsubstituted lower alkyl, aliphatic acyl, phenyl substituted aliphatic acyl, benzoyl, aralky, phenyl (the benzene nuclei of those substituents may be further substituted by chlorine, bromine, lower alkyl, lower alkoxy or nitro), allyl, allyl substituted by lower alkyl or phenyl, propargyl, or propargyl substituted by lower alkyl or a phenyl; R.sub.3 and R.sub.4 are independently lower alkyl, benzyl and phenyl (the benzene nuclei or those substiutents may be further substituted by chlorine, bromine, lower alkyl or lower alkoxy), either R.sub.1 or R.sub.2 being other than hydrogen when R.sub.3 and R.sub.4 are both ethyl groups.
REFERENCES:
patent: 3244549 (1966-04-01), Farnham et al.
patent: 3627787 (1971-12-01), Lin
patent: 3654314 (1972-04-01), Farber et al.
patent: 3691203 (1972-09-01), Koga et al.
patent: 3694461 (1972-09-01), Farber et al.
patent: 3787325 (1974-01-01), Hoover
patent: 3839361 (1974-10-01), Terayama et al.
Iwasaki Hiroshi
Kondo Mitsuru
Miyake Makoto
Kanzaki Paper Manufacturing Co. Ltd.
Milestone Norma S.
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