Temporary barrier layer for photographic element
AssigneeEastman Kodak Company
InventorsWayne A. Bowman, Ronald L. Verhow
Life of this patent
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Abstract
A polymer composition of the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, G, J, L, x, y, and z are as defined herein is useful as a temporary barrier between reactants in photographic materials. The barrier is particularly useful as a process timing layer in color image transfer film units.
Claims6
A photographic element comprising a support having thereon at least one silver halide emulsion layer, a neutralizing layer, and a temporary barrier layer separating the silver halide emulsion layer from the neutralizing layer, said barrier layer including a polymer comprising randomly repeating units of the formula:
- ##STR4## wherein R.sub.1 and R.sub.2 each independently represents hydrogen or methyl,
- R.sub.3 represents alkyl of from 1 to 4 carbon atoms,
- L represents a divalent alkyl linking group of from 2 to 8 carbon atoms,
- J represents the residue of an organic cross-linking compound having at least one other copolymerizable carbon-carbon double bond,
- G represents recurring units derived from one or more other polymerized ethylenically unsaturated comonomers,
- x represents 50 to 80 weight percent,
- y represents 1 to 40 weight percent, and
- z represents from 10 to 25 weight percent.
In a photographic element comprising at least open silver halide emulsion layer, a dye image-providing layer, a dye image-receiving layer, and a neutralizing layer, said element containing a temporary barrier layer located between the neutralizing layer and the silver halide emulsion layer, said neutralizing layer providing a pH of 11 or less to the silver halide emulsion layer, the improvement wherein the barrier layer includes a polymer comprising randomly repeating units of the formula:
- ##STR6## wherein R.sub.1 and R.sub.2 each independently represents hydrogen or methyl,
- R.sub.3 represents alkyl of from 1 to 4 carbon atoms,
- L represents an divalent alkyl linking group of from 2 to 8 carbon atoms,
- J represents the residue of an organic cross-linking compound having at least one other copolymerizable carbon-carbon double bond,
- G represents recurring units derived from one or more other polymerized ethylenically unsaturated comonomers,
- x represents 50 to 8 weight percent,
- y represents 1 to 40 weight percent, and
- z represents from 10 to 25 weight percent.
Dependencies are inferred from the claim text.