Silver halide photographic material comprising mercaptotetrazole compound(s)
AssigneeMinnesota Mining and Manufacturing Company
InventorsMassimo Bertoldi, Mark P. Kirk
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Abstract
The present invention relates to a light-sensitive silver halide photographic material comprising a support and silver halide emulsion layer or layers, wherein at least one of said silver halide emulsion layers comprises an alkylaminomercaptotetrazole antifoggant. According to a preferred embodiment of the present invention said silver halide emulsion layer comprises tabular silver halide grains having an average aspect ratio higher than 3:1 and a thickness lower than 0.4 .mu.m.
Claims12
A light-sensitive silver halide photographic element comprising a support and silver halide emulsion layer or layers coated thereon, characterized in that at least one of said light-sensitive silver halide emulsion layers comprises an alkylaminomercaptotetrazole compound having the following formula:
- wherein:
- Y is a divalent group selected from the group consisting of --SO.sub.2 -- and
- --P(O)OR--, R being hydrogen atom, alkyl group or aryl group,
- R.sub.1, R.sub.2 and R.sub.3, each equal or different, can be hydrogen atom, alkyl group or aryl group, and
- n is an integer from 1 to 5.
The light-sensitive silver halide photographic element according to claim 1 or 2, wherein said alkylaminomercaptotetrazole compound is present in amount of from 0.01 to 1 millimoles per mole of silver.
A process of using an alkylaminomercaptotetrazole compound of formula:
- ##STR7## wherein:
- Y is a divalent group selected from the group consisting of --SO.sub.2 -- and
- --P(O)OR--, R being hydrogen atom, alkyl group or aryl group,
- R.sub.1, R.sub.2 and R.sub.3, each equal or different, can be hydrogen atom, alkyl group or aryl group, and
- n is an integer from 1 to 5
- to increase the speed to Dmin ratio of a light-sensitive silver halide photographic element comprising a support and silver halide emulsion layer or layers coated thereon, said process comprising adding said alkylaminomercaptotetrazole to said silver halide emulsion layer.
Dependencies are inferred from the claim text.