Imaging element comprising an electrically-conductive layer exhibiting improved adhesive characteristics
AssigneeEastman Kodak Company
InventorsMark Lelental, Jehuda Greener
Life of this patent
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Abstract
Imaging elements, such as photographic, electrostatographic and thermal imaging elements, are comprised of a support, an image-forming layer and an electrically-conductive layer comprising electrically-conductive metal-containing particles dispersed in a binder system comprising a blend of a film-forming polymer and an anionic polymer. The combination of electrically-conductive metal-containing particles, film-forming polymer and anionic polymer provides a controlled degree of electrical conductivity and excellent adhesion to gelatin-containing layers, such as silver halide emulsion layers of photographic elements, in adhering contact with the electrically-conductive layer.
Claims17
An imaging element for use in an image-forming process;
- said imaging element comprising a support, an image-forming layer, and an electrically-conductive layer;
- said electrically-conductive layer being in adhering contact with a layer containing gelatin;
- and said electrically-conductive layer comprising electrically-conductive metal-containing particles having powder resistivity of 10.sup.5 ohm-centimeters or less dispersed in a binder system comprising a blend of a film-forming polymer and an anionic polymer that is compatible with said film-forming polymer and has a high gelatin binding efficiency, the ratio of said metal-containing particles to said binder system being sufficient to provide said electrically-conductive layer with a resistivity of less than 1.times.10.sup.12 ohms/square and the ratio of said anionic polymer to said film-forming polymer being sufficient to enhance the adhesion of said electrically-conductive layer to said layer in adhering contact therewith but insufficient to significantly degrade the cohesive strength of said electrically-conductive layer.
An imaging element for use in an image-forming process;
- said imaging element comprising a support, an image-forming layer and an electrically-conductive layer;
- said electrically-conductive layer being in adhering contact with a layer containing gelatin;
- and said electrically-conductive layer comprising electrically-conductive metal-containing particles having a powder resistivity of 10.sup.5 ohm-centimeters or less dispersed in a binder system comprising a blend of gelatin and polystyrene sulfonate, the ratio of said metal-containing particles to said binder system being sufficient to provide said electrically-conductive layer with a resistivity of less than 1.times.10.sup.9 ohms/square, and said polystyrene sulfonate being present in said blend in an amount of about 0.04 to about 0.12 parts per part by weight of gelatin.
A photographic film comprising
- (1) a support,
- (2) an electrically-conductive layer which serves as an antistatic layer overlying said support;
- and
- (3) an image-forming layer comprising silver halide grains dispersed in gelatin overlying said electrically-conductive layer and being in adhering contact therewith;
- said electrically-conductive layer comprising antimony-doped tin oxide particles having a powder resistivity of 10.sup.5 ohm-centimeters or less dispersed in a binder system comprising a blend of gelatin and polystyrene sulfonate, the ratio of said antimony-doped tin oxide particles to said binder system being sufficient to provide said electrically-conductive layer with a resistivity of less than 1.times.10.sup.9 ohms/square, and said polystyrene sulfonate being present in said blend in an amount of about 0.04 to about 0.12 parts per part by weight of gelatin.
Dependencies are inferred from the claim text.