Abstract A chromogenic material of normally colorless form is disclosed, having a structural formula: WHEREIN R1 represents a radical having the structural formula NH-CO-Y or a radical having the structural formula -NH-SO2-Y wherein Y comprises phenyl, methoxyphenyl, naphthyl, quinolyl, benzyl, alkyl radicals having less than five carbon atoms, and amino-, nitro-, and alkyl-substituted phenyl radicals wherein the alkyl groups have less than five carbon atoms; R comprises hydrogen and alkyl radicals having less than five carbon atoms; and R2 comprises alkyl radicals having less than five carbon atoms. Example include 2''-acetamido-6''-diethylaminofluoran; 6''diethylamino-2''-(phenylacetamido)-fluoran; 6''-diethylamino-2''-(ptoluenesulfonamido)fluoran; 2''-acetamido-6''-diethylamino-3''methylfluoran; 6''-diethylamino-3''-methyl-2''-(ptoluenesulfonamido)fluoran; 6''-diethylamino-2''-(pnitrobenzenesulfonamido)fluoran; 6''-diethylamino-3''-methyl-2''-(pnitrobenzenesulfonamido)fluoran; 6''-diethylamino-2''-(2naphthalenesulfonamido)fluoran; 6''-diethylamino-2''-(8quinolinesulfonamido)fluoran; and 6''-diethylamino-2''-(4methoxybenzenesulfonamido)-fluoran.
A pressure sensitive record unit comprising: a. support web or sheet material, b. mark-forming components and a releasable liquid solvent for said mark-forming components arranged in contiguous juxtaposition and supported by said sheet material, c. said mark-forming components comprising 6''-diethylamino-2''-(p-toluenesulfonamido)fluoran and an electron-accepting material of the Lewis acid type reactive with said chromogenic material to produce a mark; which components upon pressure release of the liquid solvent are brought into reactive contact in the released solvent.
Claim 2
Dependent Claim
75 words
A pressure sensitive record unit comprising: a. support web or sheet material, b. mark-forming components and a releasable liquid solvent for said mark-forming components arranged in contiguous juxtaposition and supported by said sheet material, c. said mark-forming components comprising 6''-diethylamino-3''-methyl-2''-(p-toluenesulfonamido)fluoran and an electron-accepting material of the Lewis acid type reactive with said chromogenic material to produce a mark; which components upon pressure-release of the liquid solvent are brought into reactive contact in the released solvent.
Claim 3
Dependent Claim
75 words
A pressure sensitive record unit comprising: a. support web or sheet material, b. mark-forming components and a releasable liquid solvent for said mark-forming components arranged in contiguous juxtaposition and supported by said sheet material, c. said mark-forming components comprising 6''-diethylamino-2''-(p-nitrobenzenesulfonamido)fluoran and an electron-accepting mAterial of the Lewis acid type reactive with said chromogenic material to produce a mark; which components upon pressure-release of the liquid solvent are brought into reactive contact in the released solvent.
Claim 4
Dependent Claim
75 words
A pressure sensitive record unit comprising: a. support web or sheet material, b. mark-forming components and a releasable liquid solvent for said mark-forming components arranged in contiguous juxtaposition and supported by said sheet material, c. said mark-forming components conprising 6''-diethylamino-3''-methyl-2''-(p-nitrobenzene-sulfonamido)fluoran and an electron-accepting material of the Lewis acid type reactive with said chromogenic material to produce a mark; which components upon pressure-release of the liquid solvent are brought into reactive contact in the released solvent.