Imidazomethylene dyes

Details Imidazomethylene dyes Imidazomethylene dyes

1982-08-13

1984-09-18

Coughlan, Jr., Paul M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

260154, 260156, C09B 904, C07D40102

Patent

active

044725817

ABSTRACT:
Cationic dyes of the general formula ##STR1## where A and A' may be identical or different and are each a monovalent radical of a dye from the series comprising the azo or quinophthalone dyes, or A and A' independently of one another are each one of the radicals of the formulae ##STR2## R is C.sub.1 -C.sub.6 -alkyl, benzyl or aryl, R.sup.1 is hydrogen, C.sub.1 -C.sub.4 -alkyl or aryl, D' and D" are respectively a monovalent and a divalent radical of a dye from the series comprising the triphenylmethane or xanthene dyes, n is an integer .gtoreq.1 and m is an integer .gtoreq.1, the sum (n+m) being .ltoreq.10 on average, are soluble in dilute acids, and, when they are used for wet-end dyeing of paper, give bleeding-fast, bleachable dyeings and a colorless effluent.

REFERENCES:
patent: 3592806 (1971-07-01), Iizuka et al.

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