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Method for preparing silver halide layers having substantially uniform image contrast

阅读:473发布:2022-01-14

专利汇可以提供Method for preparing silver halide layers having substantially uniform image contrast专利检索,专利查询,专利分析的服务。并且Photographic elements are provided which comprise a support having thereon a layer containing silver halide and a photographic image forming coupler, the ratio of coupler to the silver halide varying from area-to-area in the layer, the layer also including a development inhibitor-releasing coupler which is maintained at a constant ratio to the image-forming coupler in all areas of the layer. The development inhibitor-releasing coupler functions to reduce variations in dye image contrast caused by the varying ratio of photographic image-forming coupler to silver halide in the layer. Methods for preparing photographic elements are also provided.,下面是Method for preparing silver halide layers having substantially uniform image contrast专利的具体信息内容。

  • 2. The method of claim 1 wherein said photographic image-forming coupler, upon reaction with oxidized primary aromatic amine color developing agent, forms nondiffusible image dye; and, said development inhibitor-releasing coupler has a monothio group in its coupling position which, upon reaction with oxidized primary aromatic amine color-developing agent, forms a diffusible mercaptan which inhibits development.
  • 3. The method of claim 1 wherein each of said couplers are selected from the group consisting of an open-chain ketomethylene coupler radical; a 5-pyrazolone coupler radical; and, a phenolic coupler radical.
  • 4. The method of in claim 3 wherein each of said couplers has one of the following structural formulas:
  • 5. The method of claim 3 wherein each of said couplers has one of the following structural formulas:
  • 6. The method of claim 5 wherein said Y1, Y2 and Y3 each represents a heterocyclic monothio radical containing from one to four hetero nitrogen atoms, to complete said development inhibitor-releasing coupler.
  • 7. The method of claim 6 wherein said Y1, Y2 and Y3 each represents a member selected from the group consisting of: a 2-nitrophenylthio group; a 2-aminophenylthio group; a 5-tetrazolylthio group; a 2-benzothiazolylthio group; and a 5-phenyl-1,3,4-oxadiazolylthio group, to complete said development inhibitor-releasing coupler.
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