Sulfonylacetate activator-stabilizer precursor
AssigneeEastman Kodak Company
InventorsPaul Barrett Merkel, Hans Gway Ling
Life of this patent
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Abstract
An activator-stabilizer precursor compound having an acid portion which is an alpha-sulfonylacetate is useful in a photographic composition which is responsive to heat for processing. The activator-stabilizer precursors are characterized in that their acid byproducts have reduced toxicity and volatility and are substantially inert in a processed photographic element.
Claims28
In a heat developable and heat stabilizable photographic element comprising a support having thereon, in reactive association, (a) a photographic silver salt, (b) a photographic silver salt developing agent, (c) a binder, and (d) a stabilizing concentration of an activator-stabilizer precursor having a base portion and an acid portion the improvement wherein said acid portion is an alpha-sulfonylacetate.
A heat developable and heat stabilizable photographic element comprising a support having thereon in reactive association (a) a photographic silver salt, (b) a photographic silver salt developing agent, (c) a binder, and (d) a stabilizing concentration of an activator-stabilizer precursor represented by the formula:
- Q.sub.m A.sub.w
- wherein Q is a protonated basic nitrogen containing moiety;
- A is an alpha-sulfonylacetate;
- m is 1 to 4 and w is 1 to 2.
A heat developable and heat stabilizable photographic element comprising a support having thereon a layer comprising in reactive association (a) photographic silver halide, (b) a 3-pyrazolidone silver halide developing agent, (c) a polymeric binder, and (d) a stabilizing concentration of an activator-stabilizer precursor comprising bis(2-amino-2-thiazoline) methylene(sulfonylacetate).
A heat developable and heat stabilizable photographic element comprising a support having thereon a layer comprising in reactive association (a) photographic silver halide, (b) a 3-pyrazolidone silver halide developing agent, (c) a polymeric binder and (d) a stabilizing concentration of an activator-stabilizer precursor comprising N-(2-thiazolino)-N'-(imidazolino)ethylenediamine ethylenebis(sulfonylacetate).
In a heat developable and heat stabilizable photographic composition comprising (a) a photographic silver salt, (b) a photographic silver salt developing agent and (c) a stabilizing concentration of an activator-stabilizer precursor having an acid portion and a base portion the improvement wherein said acid portion is an alpha-sulfonylacetate.
A heat developable and heat stabilizable photographic composition comprising (a) a photographic silver salt, (b) a photographic silver salt developing agent, and (c) a stabilizing concentration of an activator-stabilizer precursor represented by the formula:
- Q.sub.m A.sub.w
- wherein Q is a protonated basic nitrogen containing moiety;
- A is an alpha-solfonylacetate;
- m is an integer from 1 to 4 and w is an integer 1 to 2.
A heat activatable photographic silver salt processing composition comprising a silver salt developing agent and an activator-stabilizer precursor wherein said stabilizer precursor has the formula:
- Q.sub.m A.sub.w
- wherein Q is a protonated basic nitrogen containing moiety;
- A is an alpha-sulfonylacetate;
- m is an integer from 1 to 4 and w is an integer 1 to 2 and wherein said precursor is present in the composition in a concentration sufficient to stabilize a silver halide image when said composition is heated.
A heat activatable photographic silver salt processing composition comprising (a) a hydroquinone silver halide developing agent, (b) a 4-methyl-4-hydroxymethyl-1-phenyl-3-pyrazolidone silver halide developing agent and (c) N-(2-thiazolino)-N'-(imidazolino)ethylenediamine ethylenebis(sulfonylacetate).
Dependencies are inferred from the claim text.