G - Physics – 03 – C
Patent
G - Physics
03
C
96/186, 96/32
G03C 7/00 (2006.01) C07C 43/225 (2006.01) C07D 275/06 (2006.01) G03C 1/40 (2006.01) G03C 8/48 (2006.01)
Patent
CA 1118263
5485 Abstract of the Disclosure This invention is concerned with photographic products, particularly diffusion transfer photographic film units, useful in photographic processes conducted outside of a camera wherein post-exposure fogging by ambient light is prevented by a compound initially present as a substantially colorless compound which is activated by base to provide a light-absorbing reagent or colored optical filter agent which is capable of being irreversibly discharged without a change in pH. The colorless compound or filter agent precursor is initially disposed in a layer of the film unit, for example, in a layer coated over the photosensitive element. Subsequent to imagewise exposure of the photosensi- tive element, the colored optical filter agent is generated by contacting the colorless precursor with a basic processing composition. After remaining in contact with said basic composition for a given time, the colored optical filter agent is discharged by forming a new compound which is substantially colorless and which is different from and non-reversible to said precursor and different from and non-reversible to said optical filter agent.
311904
Bloom Stanley M.
Borror Alan L.
Foley James W.
Polaroid Corporation
Smart & Biggar
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