METHOD FOR PREPARING A HYDROPHILIC COMPOSITION CONTAINING A MATTING AGENT, AND PHOTOGRAPHIC MATERIALS COMPRISING A LAYER CONTAINING THIS COMPOSITION

Method for preparing a hydrophilic composition containing a matting agent, and photographic materials comprising a layer containing this composition. Hydrophilic coating compositions are made comprising a protective colloid and dispersed therein a matting agent. The matting agent is obtained by mixi...

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Bibliographische Detailangaben
Hauptverfasser:	THIJS, VICTOR JAN MARIA, DE JAEGER, NIKOLAAS CYRIEL, TAVERNIER, BERNARD HIPPOLIET
Format:	Patent
Sprache:	eng
Schlagworte:	AUXILIARY PROCESSES IN PHOTOGRAPHY CHEMISTRY CINEMATOGRAPHY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS ELECTROGRAPHY HOLOGRAPHY MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS 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
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Beschreibung
Zusammenfassung:	Method for preparing a hydrophilic composition containing a matting agent, and photographic materials comprising a layer containing this composition. Hydrophilic coating compositions are made comprising a protective colloid and dispersed therein a matting agent. The matting agent is obtained by mixing in aqueous medium urea, formaldehyde and an aqueous colloidal dispersion of silica. The mixture is buffered to keep the pH at 3.2 or lower. Urea and formaldehyde are polycondensed whilst vigorously stirring until particles comprising urea-formaldehyde resin and silica are formed of average particle size of 1-8 mu m. The rate of stirring is reduced and the pH is raised to 5 or higher to prevent after-polycondensation and agglomeration of the polymer particles. A hydrophilic colloid is then dissolved in the reaction mixture. Photographic light-sensitive silver halide material incorporating a layer formed from the hydrophilic coating composition.