Spektral sensibilisierte Direkt-Positiv-Emulsion

摘要

1353968 Photographic materials AGFAGEVAERT AG 16 Nov 1971 [24 Nov 1970] 53112/71 Heading G2C [Also in Division C4] A photographic material comprises at least one direct-positive silver halide emulsion containing a sensitizing polymethine dye having at least one 2, 3-dihydro-pyrimidin-2-one or 2-thione ring which is quaternized in the 1-posltion and is connected through a methine chain to a nitrogencontaining 5 or 6-membered heterocyclic ring or an optionally substituted phenyl group. Preferred dyes are mainly of formula:- (in which D is a group of one of the formulµ: - E is H, aliphatic hydrocarbon, aryl or a radical of formula D; R1, R4 and R6 are each cycloalkyl or optionally substituted aliphatic hydrocarbon or aryl; R2 is aliphatic hydrocarbon or aryl; R3, R9, R10 and R11 are each H, aliphatic hydrocarbon or aryl; R5 is phenyl which is optionally substituted by alkyl, aryl, alkoxy or halogen; R7 is H, -OR9, -NR10R11 or -SR9; R8 is -OR9 or -SR9; Z completes and optionally substituted benzene ring; Y is O or S; n is O or 1; m is O or 1; q is 1 or 2; Q completes a heterocyclic ring system containing a 5- or 6-membered heterocyclic ring; the Anion may be absent; the aryl groups may be substituted).