Photographic elements with improved surface characteristics
AssigneeMinnesota Mining and Manufacturing Company
InventorLuigi Cellone
Life of this patent
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Abstract
It is generally undesirable to have surfaces on photographic elements which are highly reflective and therefore reduce the attractiveness of the image. One of the traditional means of correcting this reflectance is to coat the developed film or print with an anti-reflective coating or to place a glass cover over the imaged photographic element where the glass itself has an anti-reflective surface. According to the present invention, an anti-reflective surface may be provided within the photographic element itself by including within a top coat gelatin layer a water-soluble dextran incompatible with gelatin.
Claims8
A photographic element comprising a support and a plurality of gelatine layers which comprise a silver halide emulsion layer and a non-photosensitive external gelatin protective layer, wherein said external gelatin protective layer comprises a reflectance reducing quantity of water-soluble dextran having a molecular weight of at least 100,000 which is incompatible with gelatin.
A method for making the surface of a photographic element non-bright, wherein the element comprises a support and a plurality of gelatin layers which comprise at least one silver halide emulsion layer and a non-photosensitive external protective layer, consisting of mixing a gelatin coating composition for the external protective layer with an aqueous solution of a dextran having a molecular weight of at least 100,000 which is incompatible with dry gelatin before being spread over said at least one emulsion layer, then spreading the resulting composition over said at least one emulsion layer.
Dependencies are inferred from the claim text.