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    • 5. 发明专利
    • DE69708236T2
    • 2002-08-14
    • DE69708236
    • 1997-08-15
    • EASTMAN KODAK CO
    • MEHTA RAJESH VINODRAIIRWIN DONALD ROBERTSINGER DOUGLAS E
    • B01F5/02G03C1/005G03C1/015
    • A process of producing a photographic emulsion containing a dispersing medium and grains comprised of iodide and at least 50 mole% chloride with tabular grains having {100} major faces accounting for greater than 50 % of total projected area, comprises the steps of: (a) separately introducing soluble Ag and halide salts into a reaction vessel containing at least a portion of the dispersing medium so that nucleation occurs while the dispersing medium is maintained at a pCl in the range 0.5 - 3.5; (b) during step (a) iodide ion is witheld from the reaction vessel until after the soluble Ag and halide salts have reacted in the reaction vessel to form grain nuclei; (c) during step (a) iodide ion is introduced into a momentum distribution device located above the surface of the reactor solution after at least 0.01 % and before 3 % of total Ag forming the grains has been introduced; and solution emerging from the device in multiple streams impinges on the surface of the dispersing medium in the reactor at a momentum range between 1X10-6 and 1X106 g cmsec-2; (d) following step (a) completing grain growth under conditions that maintain the {100} major faces of the tabular grains. Also claimed is a process for forming tabular AgCl grains comprising nucleating AgCl particles, introducing alkali iodide solution into the dispersing medium containing the nucleated AgCl particles, and introducing Ag ion and Cl ion solutions into said dispersing medium, with the proviso that introduction of the alkali iodide is by multiple streams of said alkali iodide at a momentum range of up to 1X109 g cm sec-2.
    • 6. 发明专利
    • DE69708236D1
    • 2001-12-20
    • DE69708236
    • 1997-08-15
    • EASTMAN KODAK CO
    • MEHTA RAJESH VINODRAIIRWIN DONALD ROBERTSINGER DOUGLAS E
    • B01F5/02G03C1/005G03C1/015
    • A process of producing a photographic emulsion containing a dispersing medium and grains comprised of iodide and at least 50 mole% chloride with tabular grains having {100} major faces accounting for greater than 50 % of total projected area, comprises the steps of: (a) separately introducing soluble Ag and halide salts into a reaction vessel containing at least a portion of the dispersing medium so that nucleation occurs while the dispersing medium is maintained at a pCl in the range 0.5 - 3.5; (b) during step (a) iodide ion is witheld from the reaction vessel until after the soluble Ag and halide salts have reacted in the reaction vessel to form grain nuclei; (c) during step (a) iodide ion is introduced into a momentum distribution device located above the surface of the reactor solution after at least 0.01 % and before 3 % of total Ag forming the grains has been introduced; and solution emerging from the device in multiple streams impinges on the surface of the dispersing medium in the reactor at a momentum range between 1X10-6 and 1X106 g cmsec-2; (d) following step (a) completing grain growth under conditions that maintain the {100} major faces of the tabular grains. Also claimed is a process for forming tabular AgCl grains comprising nucleating AgCl particles, introducing alkali iodide solution into the dispersing medium containing the nucleated AgCl particles, and introducing Ag ion and Cl ion solutions into said dispersing medium, with the proviso that introduction of the alkali iodide is by multiple streams of said alkali iodide at a momentum range of up to 1X109 g cm sec-2.