Di-vinyl color formers

Details Di-vinyl color formers Di-vinyl color formers

1977-04-25

1978-08-15

Douglas, Winston A.

Harness for working animal

542433, C07D40106, C07D40114, C07D40314

Patent

active

041074289

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.

REFERENCES:
patent: 3491116 (1970-01-01), Lin
patent: 3491117 (1970-01-01), Lin
patent: 3703397 (1972-11-01), Lin et al.
patent: 3736337 (1973-05-01), Farber
patent: 3824119 (1974-07-01), Terayama et al.
patent: 3825561 (1974-07-01), Akamatsu et al.
patent: 3896116 (1975-07-01), Ozutsumi et al.
patent: 3928685 (1975-12-01), Alsop
patent: 4020056 (1977-04-01), Farber
patent: 4022771 (1977-05-01), Farber
patent: 4026883 (1977-05-01), Farber

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