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US 5,180,651 AGranted
Method for the addition of powders to photographic systems
AssigneeE. I. Du Pont de Nemours and Company
InventorEileen Mason
Life of this patent
Estimating the term…
Abstract
A process for improving the method by which a powder such as a dye is added to a gelatino silver halide element is described. This process involves encapsulating the powder within a gelatin capsule. This process avoids cross-contamination and dusting when powder is added to solvent and also reduces the use of extra solvent in the manufacture of the element.
Claims13
A process for the formation of a photographic emulsion containing a powder comprising the steps of
- (a) forming a plurality of gelatin capsules wherein each of the capsules is formed from two separate sections,
- (b) inserting dry powder into each of the plurality of gelatin capsules,
- (c) adding the gelatin capsules containing the powder to a photographic emulsion, and
- (d) dissolving the gelatin capsules within the . emulsion to allow release of the powder with the emulsion to obtain a uniform dispersion or solution of the powder.
1 more element
A photographic emulsion containing a powder encapsulated within a plurality of gelatin capsules wherein each of the capsules is formed from two separate sections.
Dependencies are inferred from the claim text.