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US 4,107,428 AGranted
Di-vinyl 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 and Y can be aryl and heterocyclic, each substituted Z is hydrogen and E can be tetrachloro-and tetrabromo-substituted ##STR3## 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:
- ##STR23## wherein E is tetrachloro- and tetrabromo-substituted ##STR24## X is ##STR25## 4-(N-piperidino)phenyl, and 4-(N-pyrrolidino)phenyl;
- Y is ##STR26## 4-(N-piperidino)phenyl, and 4-(N-pyrrolidino)phenyl;
- provided when X is ##STR27## Y is ##STR28## and when X is 4-(N-piperidino)phenyl or 4-(N-pyrrolidino)phenyl;
- Y is the same as X, respectively, or ##STR29## and R.sub.1, R.sub.2, R.sub.7 and R.sub.8 are methyl, ethyl, N, propyl or N-butyl groups.
1 more element
Dependencies are inferred from the claim text.