Vinyl phthalide color formers

Details Vinyl phthalide color formers Vinyl phthalide color formers

1977-04-25

1978-10-10

Curtis, Allen B.

Harness for working animal

542432, 542436, 542437, 544153, 544345, 544350, 544405, 544406, 544355, 26032614R, 26029358, 26032616, 260283R, 260296H, 2603433R, 26032625, B41M 522, C07D49102, C09B 2300

Patent

active

041197763

ABSTRACT:
A chromogenic compound of normally colorless form is disclosed having the following structural formula: ##STR1## wherein A can be ##STR2## T, Q, 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.

REFERENCES:
patent: 3491111 (1970-01-01), Lin
patent: 3491112 (1970-01-01), Lin
patent: 3491116 (1970-01-01), Lin
patent: 3936564 (1976-02-01), Miyazawa
patent: 4020068 (1977-04-01), Farber
Perjessy et al. Chem. Abstracts 75 (1971) #150959.
Kolsaker Chem. Abstracts 82 (1975) #30495.

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