Di-vinyl phthalides color formers
AssigneeNCR Corporation
InventorSheldon Farber
Life of this patent
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Abstract
A chromogenic compound of normally colorless form is disclosed having the following structural formula: ##STR1## wherein A and B can be ##STR2## X, Y and Z can be, among several others, hydrogen, alkyl, alkoxy, aryl, and heterocyclic, substituted and unsubstituted; and E can be a broad family of aromatic and heterocyclic structures. The compound is eligible for use in pressure-sensitive record materials and manifold marking systems. Because of light absorption characteristics, selected compounds of this invention are especially useful where machine readability and machine copiability are important.
Claims7
A compound represented by the formula:
- ##STR10## wherein E is ##STR11## unsubstituted and alkyl-, chloro-, dichloro-, trichloro-, tetrachloro-, bromo-, dibromo-, tribromo-, tetrabromo-, nitro- and dialkylamino-substituted;
- ##STR12## unsubstituted and nitro-substituted;
- ##STR13## Y is:
- X or hydrogen;
- Z is:
- hydrogen or methyl;
- R.sub.1 and R.sub.2 are:
- hydrogen, alkyl, phenyl, and benzyl, and but R.sub.1 and R.sub.2 are not both phenyl;
- R.sub.3, r.sub.4, r.sub.5, and R.sub.6 are:
- hydrogen, alkyl, phenyl, benzyl, alkoxy, halo, dialkylamino, monoalkylamino, amino, acetylamino;
- and
- wherein alkyl, each occurrence, and alkoxy have one to six carbon atoms.
Dependencies are inferred from the claim text.