Photographic materials having improved keeping properties
AssigneeEastman Kodak Company
InventorsNicholas E. Grzeskowiak, Colin J. Gray
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Abstract
The use of a red-sensitising trinuclear merocyanine dye and an osmium dopant according to formula (I): [Os(NZ)L5]r wherein Z is sulphur or oxygen, L is a ligand and r is 0, −1, −2 or −3, in photographic silver halide emulsions for use in photographic materials, result in a reduction and/or prevention of speed gain in the emulsion over time without significant speed loss.
Claims21
A photographic material comprising a silver halide emulsion, said silver halide emulsion comprising a red sensitizing trinuclear merocyanine dye and an osmium dopant according to formula I
- [Os(NZ)L5]r (I)
- wherein
- Z is sulfur or oxygen,
- L is a ligand, and
- r is 0, −1, −2 or −3.
A method of manufacturing a printed circuit board, said method comprising image-wise exposing an electronic circuit layout pattern onto a photographic material comprising a silver halide emulsion, said silver halide emulsion comprising a red sensitizing trinuclear merocyanine dye and an osmium dopant according to formula I
- [Os(NZ)L5]r (I)
- wherein
- Z is sulfur or oxygen,
- L is a ligand, and
- R is 0, −1, −2, or −3,
- developing said exposed photographic material to produce a photomask, placing said photomask in contact with a printed circuit board substrate, exposing said printed circuit board substrate through said mask and processing said exposed printed circuit board substrate.
A method for reducing the extent of or preventing speed gain over time of a red-sensitive photographic silver halide emulsion, said method comprising incorporating into said silver halide emulsion a trinuclear merocyanine dye and an osmium dopant according to formula I
- [Os(NZ)L5]r (I)
- wherein
- Z is sulfur or oxygen,
- L is a ligand, and
- r is 0, −1, −2 or −3.
Dependencies are inferred from the claim text.