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AssigneeFuji Hunt Photographic Chemicals, Inc.
InventorsHongzoon Kim, Charles J. Pfeiffer
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A method for making flowable alkaline thiosulfate, flowable alkaline sulfite, or a combination of the two, by blending an alkaline thiosulfate, an alkaline sulfite, or a combination of the two, with an alkali metal arylsulfonate.formaldehyde in an amount effective to render the alkaline thiosulfate, the alkaline sulfite, or the combination freely flowable, and the product of this method. It has been found that the product of this method, such as freely flowable ammonium thiosulfate powder mixture, can be stored in a freely flowable condition for extended periods of time and can be dissolved into solution readily to form a clear non-turbid solution. The freely flowable ammonium thiosulfate powdered mixture of the present invention is particularly useful as a photographic fixative and bleach fixative for processing photographic elements.
A flowable powdered mixture comprising (a) a member selected from the group consisting of a hygroscopic alkaline thiosulfate, a hygroscopic alkaline sulfite, and a mixture thereof, and (b) a dry alkali metal arylsulfonate.formaldehyde in an amount from about 0.05 to 10%, by weight, of said mixture which is effective to provide flowability to the mixture.
A flowable powdered mixture comprising a hygroscopic alkaline thiosulfate and a dry alkali metal arylsulfonate.formaldehyde in an amount from about 0.05 to 10%, by weight, of said mixture to provide flowability to the alkaline thiosulfate.
A method of making a flowable alkaline thiosulfate powdered mixture comprising mixing (a) a hygroscopic alkaline thiosulfate with (b) a dry alkali metal arylsulfonate.formaldehyde in an amount from about 0.05 to 10%, by weight, of said mixture which is effective to provide flowability to the mixture.
A method of making an improved fixing solution comprising the steps of (1) mixing a hygroscopic alkaline thiosulfate, a hygroscopic alkaline sulfite and a dry alkali metal arylsulfonate.formaldehyde in an amount from about 0.05 to 10%, by weight, of said mixture which is effective to provide flowability to the blended mixture, and (2) dissolving the thus-formed blended mixture into an aqueous solution.
Dependencies are inferred from the claim text.