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    • 9. 发明授权
    • Dye releasing couplers for color diffusion transfer elements with dye
barrier layers
    • US5342730A
    • 1994-08-30
    • US952444
    • 1992-09-28
    • Thomas R. WelterJohn Texter
    • Thomas R. WelterJohn Texter
    • G03C8/08G03C8/52G03C5/54
    • G03C8/52G03C8/08
    • In accordance with this invention a photographic color diffusion transfer element and process for its development are provided. The element comprises a single dimensionally stable support, wherein said support comprises an opaque and light reflecting layer, and coated thereon in reactive association and in sequence (1) a mordant layer for binding diffusible dyes, (2) a stripping layer, (3) one or more layers comprising radiation sensitive silver halide and a diffusible-dye forming coupler, and (4) a barrier layer comprising a polymer that (a) allows the passage of solutions for processing said element when said element is contacted with an external processing bath and (b) impedes the diffusion out of said element of the diffusible dye formed from said diffusible-dye forming coupler, and wherein said diffusible-dye forming coupler is of the structureCp-L-DyewhereinCp is a coupler radical selected from the group comprising cyan dye forming radicals, magenta dye forming radicals, yellow dye forming radicals, black dye forming radicals, and colorless product forming radicals, said Cp being substituted in the coupling position with a divalent linking group, L;Dye is a dye radical exhibiting selective absorption in the visible spectrum and contains a solubilizing group;and where said -L-Dye group couples off upon reaction of said coupler radical with the oxidation product of a primary amine developing agent. In another preferred embodiment, said element comprises a single dimensionally stable transparent support, and coated thereon in reactive association and in sequence (1) a mordant layer for binding diffusible dyes, (2) an opacifying light reflecting layer, (3) one or more layers comprising radiation sensitive silver halide and a diffusible-dye forming coupler, and (4) a barrier layer comprising a polymer that (a) allows the passage of solutions for processing said element when said element is contacted with an external processing bath and (b) impedes the diffusion out of said element of the diffusible dye formed from said diffusible-dye forming coupler. In another preferred embodiment, said element comprises a single dimensionally stable transparent support, and coated thereon in reactive association and in sequence (1) one or more layers comprising radiation sensitive silver halide and a diffusible-dye forming coupler, (2) an opacifying light reflecting layer, (3) a mordant layer for binding diffusible dyes, and (4) a barrier layer comprising a polymer that (a) allows the passage of solutions for processing said element when said element is contacted with an external processing bath and (b) impedes the diffusion out of said element of the diffusible dye formed from said diffusible-dye forming coupler.