Gas separation: apparatus – Solid sorbent apparatus – With control means responsive to sensed condition
Patent
1977-07-11
1978-11-07
Kelley, Mary F.
Gas separation: apparatus
Solid sorbent apparatus
With control means responsive to sensed condition
G03C 102
Patent
active
041243986
ABSTRACT:
Disclosed herein are aqueous and nonaqueous photographic bleaching solutions and radiation sensitive elements comprising a thiyl bleaching agent precursor having the formula ##STR1## wherein Z comprises the nonmetallic atoms necessary to complete a 5 to 7 member heterocyclic ring; R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are independently selected from the group consisting of alkyl, cycloalkyl, aralkyl, aryl or R.sup.2 and R.sup.3 or R.sup.4 and R.sup.5 can be taken together with the carbon atom of the ring to which they are attached to form a cycloalkyl or cycloalkenyl group; and R.sup.1 is independently selected from the group consisting of hydrogen, oxo and a complexing ligand for silver (I) ion wherein the Ksp of the complexed product of the ligand and silver (I) ion is less than about 10.sup.-12 at 25.degree. C. The thiyl bleaching agents disclosed herein are capable of bleaching preformed or predeveloped metals such as silver in both aqueous and nonaqueous photographic materials. They do not adversely affect the photographic properties of radiation sensitive emulsions and can be thermally activated in a dry photothermographic process.
Ciurca, Jr. Samuel J.
Kohrt Carl F.
Eastman Kodak Company
Kelley Mary F.
Rosenstein Arthur H.
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