Bleachable dyes

Details Bleachable dyes Bleachable dyes

1980-10-22

1983-01-18

Bond, Robert T.

Harness for working animal

542445, 542441, 430522, 430518, C07D23122, C07D48704

Patent

active

043693105

ABSTRACT:
Dyestuffs of the general formula ##STR1## wherein A and B each represent a cyano, acyl or carbalkoxy group save that when A is cyano B cannot be cyano or carbalkoxy, or A and B form together with the carbon atom to which they are attached a carbocyclic or heterocyclic ring system, R.sub.1 is hydrogen, alkyl or alkoxy, R.sub.2 alkyl, R.sub.3, R.sub.4, R.sub.5 each are hydrogen, alkyl, carboxyalkyl, alkoxy-carbonyl-alkyl or aryl, or two of R.sub.3, R.sub.4 and R.sub.5 or all three R.sub.3, R.sub.4 and R.sub.5 may form together with the nitrogen atom to which they are bonded a ring system, Z is a linking group and X.sup..crclbar. an anion.
The dyes can be bleached easily and they are suitable as antihalation or filter dyes in photographic materials.

REFERENCES:
patent: 3540887 (1970-11-01), Depoorter et al.
patent: 3563748 (1971-02-01), Depoorter et al.
patent: 3615546 (1971-10-01), Depoorter et al.
patent: 3745159 (1973-07-01), Reiner et al.
patent: 4234677 (1980-11-01), Postle
March, "Advanced Organic Chemistry", (McGraw-Hill), (1968), pp. 697-698.

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