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1. 发明授权

US5478718A Preparation of silver halide tabular emulsions in the presence of non-aqueous polar aprotic solvents and/or protic solvents having a dissociation constant smaller than that of water 失效
标题翻译：在非水性极性非质子溶剂和/或质子溶剂的存在下制备卤化银片状乳液，其解离常数小于水
公开(公告)号：US5478718A
公开(公告)日：1995-12-26
申请号：US374178
申请日：1995-01-18
申请人： Ann Verbeeck , Angel Millan
发明人： Ann Verbeeck , Angel Millan
IPC分类号： G03C1/015 , G03C1/005 , G03C1/035 , G03C1/06 , G03C1/07
CPC分类号： G03C1/0051
摘要： A method has been found for the preparation of tabular silver halide emulsions having a tabularity, defined as the ratio between the aspect ratio and the thickness of the emulsion crystals, of at least 25 and a homogeniety of the distribution of said silver halide emulsion crystals, defined as a hundred times the ratio between the standard deviation and the average projective crystal diameter of said crystals of less than 30, characterized by the steps of forming silver halide grain nuclei by introduction of an aqueous silver salt solution and an aqueous halide salt solution, both solutions optionally comprising at least one non-aqueous solvent, in a reaction vessel containing water, a protective colloid and at least one non-aqueous aprotic solvent or a protic solvent having a dissociation constant smaller than that of water in a ratio by weight of solvent versus water from 5 to 60%; adding an aqueous silver salt solution and an aqueous halide salt solution to the said reaction vessel containing the said silver halide grain nuclei at a pBr value higher than 2.0; flocculating the grown silver halide emulsion grains; washing and redispersing them.
摘要翻译：已经发现制备具有平板状的片状卤化银乳剂的方法，其定义为乳液晶体的纵横比和厚度之比至少为25，并且所述卤化银乳剂晶体的分布的均匀性，定义为所述晶体的标准偏差和平均投影晶体直径之比小于30的百倍，其特征在于通过引入银盐水溶液和卤化物水溶液形成卤化银颗粒核的步骤，两种溶液任选地包含至少一种非水溶剂，在含有水的反应容器中，保护胶体和至少一种非水性非质子溶剂或质子溶剂，其解离常数小于水的解离常数，其重量比溶剂与水的比例为5至60％; 在含有所述卤化银颗粒核的所述反应容器中以高于2.0的pBr值加入银盐溶液和卤水盐溶液; 絮凝生长的卤化银乳剂颗粒; 洗涤和再分散它们。

2. 发明授权

US5541051A Preparation of silver halide tabular emulsions in the presence of polar aprotic solvents and/or alcohols 失效
标题翻译：在极性非质子溶剂和/或醇的存在下制备卤化银片状乳液
公开(公告)号：US5541051A
公开(公告)日：1996-07-30
申请号：US374177
申请日：1995-01-18
申请人： Ann Verbeeck , Christiaan Van Roost , Angel Millan
发明人： Ann Verbeeck , Christiaan Van Roost , Angel Millan
IPC分类号： G03C1/015 , G03C1/005 , G03C1/025 , G03C1/035 , G03C1/06 , G03C1/07
CPC分类号： G03C1/0051 , G03C1/015
摘要： This invention offers a new method to produce tabular silver halide grains, more preferably silver bromide or silver bromoiodide grains, having a tabularity, defined as the ratio between the aspect ratio and the thickness of the emulsion crystals, of at least 25 and a homogeniety of the distribution of said silver halide emulsion crystals, defined as a hundred times the ratio between the standard deviation and the average projective crystal diameter of said crystals of less than 30, characterized by the steps of adding to a reaction vessel containing at least one polar aprotic solvent a silver salt in an amount to get a concentration from 0.01 to 1M of said silver salt and a halide salt in an amount to get a concentration 1 to 10.sub.4 times the molar concentration of said silver salt; dissolving the said silver salt and the said halide salt; adding a protic solvent to the said reaction vessel in order to form twinned tabular nuclei; colloidally stabilizing said twinned tabular nuclei by the addition of a protective colloid apart or together with at least one protic solvent or with a mixture of at least one protic and at least one aprotic solvent, in order to obtain a ratio by weight of water to (a)protic solvent of not more than 40:60 in the reaction vessel; optionally growing said twinned tabular nuclei to tabular silver halide emulsion crystals in the same or in another reaction vessel by the addition of an aqueous soluble silver salt solution and a aqueous soluble halide salt solution; flocculating and decanting the said emulsion crystals obtained, followed by washing and redispersing or applying dialysis or ultrafiltration techniques.
摘要翻译：本发明提供了一种制备片状卤化银颗粒，更优选溴化银或溴碘化银颗粒的新方法，其具有平坦度，其定义为乳液晶体的纵横比和厚度之间的比例至少为25，并且均匀度所述卤化银乳剂晶体的分布定义为所述晶体的标准偏差和平均投射晶体直径之比的百倍以下，小于30，其特征在于以下步骤：向含有至少一种极性非质子溶剂的银盐，其量为所得银盐的0.01至1M的浓度和卤化物盐，其量为所述银盐的摩尔浓度的1至104倍; 溶解所述银盐和所述卤化物盐; 向所述反应容器中加入质子溶剂，以便形成配对的片状核; 通过加入保护胶体与至少一种质子溶剂或至少一种质子性和至少一种非质子溶剂的混合物一起胶体地稳定所述双胞嘧啶核，以获得水的重量比（ a）反应容器中不超过40:60的质子溶剂; 任选地通过加入水溶性银盐溶液和水溶性卤化物盐溶液，在相同或另一反应容器中将所述孪生片状核生长成片状卤化银乳剂晶体; 将所得乳液晶体絮凝和倾析，然后洗涤和再分散或进行透析或超滤技术。

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