公开(公告)号：US5741633A

公开(公告)日：1998-04-21

申请号：US478631

申请日：1995-06-07

申请人： Mark Anthony Whitson ,  John Derek Lewis ,  Tienteh Chen ,  Thomas Joseph Dannhauser ,  Pranab Bagchi

发明人： Mark Anthony Whitson ,  John Derek Lewis ,  Tienteh Chen ,  Thomas Joseph Dannhauser ,  Pranab Bagchi

IPC分类号： G03C1/015 ,  G03C1/005 ,  G03C1/035 ,  G03C1/04 ,  G03C1/047 ,  G03C1/30 ,  G03C1/42 ,  G03C1/43 ,  G03C7/388 ,  G03C1/91

CPC分类号： G03C1/047 ,  G03C1/005 ,  G03C1/30 ,  G03C7/388 ,  G03C7/3882 ,  G03C2001/0471 ,  Y10S430/151

摘要： The invention describes silver halide packet emulsion grains or crystals that are conventionally precipitated using gelatin of a given isoelectric pH, surrounded by a layer of gelatin-grafted-polymer particles wherein the grafted gelatin has a different isoelectric pH and the said gelatin-grafted-polymer particles are optionally chemically bonded to the gelatin surrounding the silver halide microcrystals. Such packet emulsions can form the basis for a mixed-packet color photographic system.

公开(公告)号：US5693461A

公开(公告)日：1997-12-02

申请号：US407885

申请日：1995-03-21

申请人： Pranab Bagchi ,  Tienteh Chen ,  Thomas Joseph Dannhauser ,  John Derek Lewis ,  Mark Anthony Whitson

发明人： Pranab Bagchi ,  Tienteh Chen ,  Thomas Joseph Dannhauser ,  John Derek Lewis ,  Mark Anthony Whitson

IPC分类号： G03C7/00 ,  G03C1/005 ,  G03C1/015 ,  G03C1/047 ,  G03C7/388 ,  G03C1/494

CPC分类号： G03C1/047 ,  G03C1/005 ,  G03C7/388

摘要： This invention describes the composition and method of preparation of heteroflocculated packet emulsion clusters containing a light sensitive and selectively photosensitized silver halide emulsion particles and particles of photographic agents such as dye-forming coupler particles. The silver halide emulsion particles are associated with a layer of adsorbed peptizing gelatin with an isoelectric pH of P.sub.1 and the grafted gelatin of the gelatin-grafted-polymer particles comprising the photographic agent has an isoelectric pH of P.sub.2 such that P.sub.1 is different than P.sub.2. At least one of the peptizing and grafted gelatins is an isoing gelatin which is sufficiently derivatized to remove ionic groups thereof such that approaching the isoelectric pH in an aqueous solution of the isoing gelatin causes massive heteroflocculation. Formation of packet emulsion clusters is achieved by heteroflocculation between oppositely charged silver halide particles and gelatin-grafted-latex polymer particles comprising the photographic agents by shift of the pH to within 0.5 pH units of the isoelectric pH of the isoing gelatin and at a value between the two isoelectric pH values of two different types of gelatins used. The heteroflocculated packet emulsions can be further stabilized via hardening of the gelatins surrounding the particles in the packet clusters using a concentrated gelatin hardener. Such packet emulsion clusters are suitable for use in mixed packet color photography.

摘要翻译： 本发明描述了制备含有光敏选择性光敏卤化银乳剂颗粒和照相剂颗粒如染料形成成色剂颗粒的异源絮凝包乳液簇的组合物和方法。 卤化银乳剂颗粒与等电位pH为P1的吸附的胶溶明胶层相关联，并且包含感光剂的明胶接枝聚合物颗粒的接枝明胶具有P2的等电位pH，使得P1不同于P2。 胶溶和接枝的明胶中的至少一种是等离子明胶，其被充分衍生化以除去其离子基团，使得接近等离子体明胶的水溶液中的等电位pH导致大量的异型絮凝。 分组乳液簇的形成是通过将相对电荷的卤化银颗粒与包含照相剂的明胶接枝胶乳聚合物颗粒之间的异相结合来实现的，所述明胶接枝胶乳聚合物颗粒通过将pH移动到等离子体明胶的等电位pH的0.5pH单位内， 使用两种不同类型明胶的两种等电位pH值。 通过使用浓缩明胶固化剂使包围簇中的颗粒周围的明胶固化，可以进一步稳定异源絮凝的包乳液。 这样的分组乳胶簇适用于混合包彩色摄影。