Radiation imagery chemistry: process – composition – or product th – Transfer procedure between image and image layer – image... – Diffusion transfer process – element – or identified image...
Patent
1979-10-29
1981-05-26
Schilling, Richard L.
Radiation imagery chemistry: process, composition, or product th
Transfer procedure between image and image layer, image...
Diffusion transfer process, element, or identified image...
430221, 430227, 430236, 430244, 430434, 430444, 430448, 430517, 430519, 430627, G03C 140, G03C 184, G03C 554, G03C 110
Patent
active
042699258
ABSTRACT:
Polymeric optical filter agents and photographic products and processes using same are disclosed. The polymeric optical filter agents are pH-sensitive optical filter agents comprising polymeric backbone units having the following hydrazone moiety: ##STR1## where R is a group which can provide a double bond for conjugation with the ##STR2## portion of the moiety to provide light-absorbing capability for the agent at a pH above its pKa, and X represents a substituent of R providing at least one electron-withdrawing group. The polymeric pH-sensitive optical filter agents have a highly colored light-absorbing form at a pH above the pKa and are substantially non-absorbing at a pH below the pKa. The polymeric optical filter agents are useful in photographic film units and processes for the protection of photoexposed photosensitive elements against the occurence of fogging during in-light development.
REFERENCES:
patent: 1866956 (1932-07-01), Tschunkur et al.
patent: 2350764 (1944-06-01), Jelly et al.
patent: 2497526 (1950-02-01), Arnold
patent: 2763566 (1956-09-01), Allan
patent: 2875053 (1959-02-01), Minsk
patent: 2888346 (1959-05-01), Tulagin et al.
patent: 3053678 (1962-09-01), Mix
patent: 3414650 (1968-12-01), Catino et al.
patent: 3573287 (1971-03-01), Schorr et al.
patent: 3697595 (1972-10-01), Clecak et al.
patent: 3775405 (1973-11-01), Bruce
patent: 3953211 (1976-04-01), Imai et al.
"Spectrophotometric Studies . . . ", Jones et al., J. Org. Chem., vol. 25, 1960, pp. 226-231.
Barton Derek H. R.
Bronstein-Bonte Irena Y.
Taylor Lloyd D.
Polaroid Corporation
Schilling Richard L.
Xiarhos Louis G.
LandOfFree
Polymeric optical filter agents and photographic products and pr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polymeric optical filter agents and photographic products and pr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polymeric optical filter agents and photographic products and pr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-454072