Single-side coated silver halide photographic film material having reduced tendency to curl
AssigneeAfga-Gevaert Aktiengesellschaft
InventorsMark Van den Zegel, Francis Vanhoudt, Frank Ruttens, Guy Damen
Life of this patent
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Abstract
A single-side coated light-sensitive silver halide photographic film material has been disclosed, having on one side of a subbed support, one or more light-sensitive silver halide emulsion layer(s) overcoated with an outermost protective layer; and, at the other side of said support, a backing layer, covered with a protective outermost layer, characterized in that at least said backing layer is provided with a layer wherein, besides a cross-linked or cross-linkable first binder an organic component free from cross-linking upon reaction with a hardener is present as a second binder having a low molecular weight.
Claims18
Single-side coated light-sensitive silver halide photographic film material comprising,
- on one side of a subbed support, one or more light-sensitive silver halide emulsion layer(s) overcoated with an outermost protective layer;
- said emulsion layer(s) having
- silver halide grains dispersed in binder, wherein said silver halide is coated in a total amount, expressed as an equivalent amount of silver nitrate of more than 5 g per m2,
- a latex polymer present in an amount of less than 30% by weight versus said binder, and
- at the other side of said support, a backing layer, covered with a protective outermost layer,
- characterized in that at least said backing layer is provided in at least one layer thereof, besides a cross-linked or cross-linkable first binder, with an organic component free from cross-linking upon reaction with a hardener, as a second binder, wherein said organic component is a polymer selected from the group consisting of dextran having a molecular weight not more than 20000 and polyacrylamide having a molecular weight not more than 20000 wherein in at least one layer of said backing layer, said organic component free from cross-linking upon reaction with a hardener should be present in an amount of at least 50%, by weight, versus the amount of cross-linked or cross-linkable first binder and wherein said at least one layer of said backing layer is the first layer of said backing layer, being the layer more close to the subbed support than any other layer with the proviso that said film material has a ΔBP-AP of 4.2 or less.
A photographic element comprising:
- a support comprising an imaging side and a backing side;
- an imaging layer on said imaging side of said support wherein said imaging layer comprises:
- a silver halide emulsion layer comprising silver halide dispersed in a binder;
- a latex polymer present in an amount of less than 30%, by weight, of said binder;
- and
- a protective overcoat
- a backing on said backing side of said support wherein said backing comprises:
- a first backing layer comprising a cross-linked binder;
- a second backing layer comprising an organic component free from cross-linking wherein said organic component is a polymer selected from a group consisting of dextran having a molecular weight of no more than 20,000 and polyacrylamide having a molecular weight of no more than 20,000
- with the proviso that said photographic element has a ΔBP-AP of 4.2 or less.
A mammography film comprising:
- a support comprising an imaging side and a backing side;
- an imaging layer on said imaging side of said support wherein said imaging layer comprises:
- a silver halide emulsion layer comprising silver halide dispersed in a binder wherein said silver halide is coated in a total amount, expressed as an equivalent amount of silver nitrate of more than 5 g per m2,
- a latex polymer present in an amount of less than 30%, by weight, of said binder;
- and
- a protective overcoat
- a backing on said backing side of said support wherein said backing comprises:
- a first backing layer comprising a cross-linked binder;
- a second backing layer comprising an organic component free from cross-linking wherein said organic component is a polymer selected from a group consisting of dextran having a molecular weight of no more that 20,000 and polyacrylamide having a molecular weight of no more that 20,000
- with the proviso that said mammography film has a ΔBP-AP of 4.2 or less.
Dependencies are inferred from the claim text.