Process for the preparation of silver halide photographic emulsi

Details Process for the preparation of silver halide photographic emulsi Process for the preparation of silver halide photographic emulsi

1990-01-14

1991-07-16

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430578, 430579, 430580, 430581, 430583, 430585, 430588, 430589, 430592, 430594, 430595, 430607, 430613, 430614, 430569, G03C 102, G03C 108

Patent

active

050325000

ABSTRACT:
A process or the preparation of a silver halide photographic emulsion is provided which comprises the addition of at least one pendant type spectral sensitizing dye containing as a substituent a compound having the effect of inhibiting fog at any time after the formation of silver halide grains, but before the completion of the chemical ripening process. In a preferred embodiment, the addition of said pendant type spectral sensitizing dyes is effected at any time after the formation of silver halide grains, but before former one second of the total time of the chemical ripening process. The pendant type spectral sensitizing dyes are compounds represented by the general formula (III) or (IV): ##STR1## wherein SSD represents a sensitizing dye portion; AF represents a compound portion containing a saturated or unsaturated 5- to 7-membered ring containing at least one nitrogen atom; L.sup.1 represents a divalent connecting group containing at least one of C, N, S and O; L.sup.2 has the same meaning at L.sup.1 and does not connect SSD and AF; l.sup.1, l.sup.2 and l.sup.3 each represents an integer 1 to 3, l.sup.2 being equal to l.sup.1 or l.sup.3 ; l.sup.4 represents an integer 0 to 3; and l.sup.5 represents an integer 0 or 1, with the proviso that when there is a plurality of L.sup.1 's, L.sup.2 's, SSD's or AF's, they may be the same or different and that when none of L.sup.2 's adjacent to l.sup.5 connect SSD and AF, l.sup.5 represents 0.

REFERENCES:
patent: 4040825 (1977-08-01), Steiger et al.
patent: 4225666 (1980-09-01), Locker et al.

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