Modified starches and compositions such as photographic silver halide emulsions containing them

The solubility of dialdehyde starch in water is improved by treating it at room temperature with dilute alkali, which preferably has a strength of 0.01 N to 0.1 N. In examples, dialdehyde starch with an aldehyde content 90% of the theoretical maximum was shaken for 1 hour at room temperature with 0....

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Bibliographische Detailangaben
Hauptverfasser:	JEFFREYS ROY ARTHUR, TABOR BRYAN ERNEST
Format:	Patent
Sprache:	eng
Schlagworte:	AUXILIARY PROCESSES IN PHOTOGRAPHY CHEMISTRY CINEMATOGRAPHY COMPOSITIONS BASED THEREON ELECTROGRAPHY HOLOGRAPHY METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES PHOTOGRAPHY PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES PHYSICS THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS
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Beschreibung
Zusammenfassung:	The solubility of dialdehyde starch in water is improved by treating it at room temperature with dilute alkali, which preferably has a strength of 0.01 N to 0.1 N. In examples, dialdehyde starch with an aldehyde content 90% of the theoretical maximum was shaken for 1 hour at room temperature with 0.0125 N or 0.025 N NaOH and the product filtered, washed and dried by mixing with acetone. The treated aldehyde starch when added in an amount of 0.0033 grams to 1 gram of gelatin raises the melting point of the gelatin from 56 to 62 DEG C. and is useful for coatings and emulsions for black- andwhite and colour photography. Specification 928,591 is referred to.