Azo dye developers comprising furan rings

Details Azo dye developers comprising furan rings Azo dye developers comprising furan rings

1974-07-08

1976-11-30

Klein, David

Gas separation: apparatus

Electric field separation apparatus

Including gas flow distribution means

96 3, 96 29D, 96 77, 96 99, G03C 176, G03C 140, G03C 700, G03C 110

Patent

active

039947319

ABSTRACT:
A dye developer represented by the following general formula (I), ##SPC1##
wherein X is a hydrogen atom, a bromine atom, a nitro group, an acylamino group, a hydroxyl group or an alkyl group having not more than 4 carbon atoms; n is 1, 2 or 3; Y is an acyl group having not more than 4 carbon atoms; and Ar is a mono- or polyaryl group; and wherein an aromatic ring can be condensed in the 4-and 5-positions of the furan ring nucleus, and at least one of X, the aromatic ring condensed with the furan ring nucleus and Ar being directly connected to or being connected through an atom or an atomic grouping to a polyphenol having developing activity for silver halide.

REFERENCES:
patent: 3134672 (1964-05-01), Blout et al.
patent: 3307947 (1967-03-01), Idelson et al.
patent: 3415646 (1968-12-01), Land

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