Compositions – Compositions containing a single chemical reactant or plural... – Organic reactant
Patent
1993-08-19
1995-08-15
Lieberman, Paul
Compositions
Compositions containing a single chemical reactant or plural...
Organic reactant
252 792, 252 95, 25218643, 134 2, 134 3, C23G 102, C01B 1508
Patent
active
054416655
ABSTRACT:
A method of cleaning photographic apparatus comprises contacting the apparatus with an aqueous composition containing a peroxo compound chosen from one or more of:
(a) an ionic peroxide of the formula M.sub.x O.sub.2, where M is a single charged cation and x is 2, or M is a double charged cation and x is 1, or
(b) a peroxo acid of sulfur, phosphorous, carbon or boron, or a salt thereof, or
(c) hydrogen peroxide, or a substance that contain hydrogen peroxide.
Preferably the composition also contains acid, and/or at least one catalyst or accelerator compound. The peroxo compound may be one or more of: an ionic peroxide chosen from an alkali metal, alkaline earth metal, or ammonium, peroxide, or a peroxo acid chosen from peroxodisulfuric acid, peroxomonosulfuric acid, peroxodicarbonic acid, peroxodiphosphonic acid, per-organic acids, or a salt thereof. A preferred peroxo compound is a persulfate salt. The invention also concerns a formulation for cleaning photographic equipment. An example of a suitable such formulation contains sodium persulfate (0-100 wt %), sulfamic acid (0-30%, pH about 0.8-5.5), and boric acid and sodium metaperiodate (together 0-10%).
REFERENCES:
patent: 3738867 (1973-06-01), Franz
patent: 3986970 (1976-10-01), Shiga
patent: 4021264 (1977-05-01), Knorre et al.
patent: 4100095 (1978-07-01), Hutchins et al.
patent: 4678597 (1987-07-01), Kiener
J. Pouradier; "Photographic Gelatin", reprinted from Journal Signalaufzeichnungsmaterialen 3, 209-18 (1975).
Kenneth B. Wiberg; Oxidation in Organic Chemistry, Part A, Academic Press, New York, 1965; pp. 210-217.
W. S. Trahanovski, Oxidations in Organic Chemistry, Academic Press, New York, 1978; pp. 254-263.
M. Hudlicky, Oxidations in Organic Chemistry, American Chemical Society, Monograph 186, ACS 1990; pp. 6-15; 266-271.
Douyon Lorna M.
Lieberman Paul
Medefield Pty Ltd
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