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1. 发明授权

US06391534B1 Preparation of high bromide photographic emulsions with starch peptizer and oxidizing agent 失效
标题翻译：用淀粉胶溶剂和氧化剂制备高溴酸盐照相乳剂
公开(公告)号：US06391534B1
公开(公告)日：2002-05-21
申请号：US09731445
申请日：2000-12-07
申请人： Joe E. Maskasky , Victor P. Scaccia
发明人： Joe E. Maskasky , Victor P. Scaccia
IPC分类号： G03C1085
CPC分类号： G03C1/04 , G03C1/005 , G03C1/0051 , G03C1/08 , G03C2001/03511 , G03C2001/0478 , G03C2200/03 , G03C2200/44
摘要： A process for precipitating a high bromide silver halide emulsion in an aqueous medium is described comprising precipitating high bromide radiation-sensitive silver halide grains in a reaction vessel in the presence of a peptizer comprising a water dispersable starch, wherein a strong oxidizing agent is added to the reaction vessel during or after the precipitation at a pH of less than 4.0 such that an oxidation potential of at least 650 mV (Ag/AgCl ref.) is achieved. A reduction in the rate of reaction between strong oxidants such as bromine and starch at such low pH has been found to enable an advantageous decrease in the amount of oxidant required to achieve and maintain a high oxidation potential during emulsion grain precipitation. Starch, unlike gelatin, also advantageously has adequate stability at the combination of high acidity and high emulsion precipitation temperatures.
摘要翻译：描述了一种在水性介质中沉淀高溴化物卤化银乳剂的方法，其包括在包含水分散性淀粉的胶溶剂存在下，在反应容器中沉淀高溴化物辐射敏感卤化银颗粒，其中将强氧化剂加入在小于4.0的pH下沉淀期间或之后的反应容器，使得达到至少650mV（Ag / AgCl参考）的氧化电位。已经发现，在如此低的pH下，强氧化剂如溴和淀粉之间的反应速率的降低使得在乳液颗粒沉淀期间实现和保持高氧化电势所需的氧化剂的量的有利的减少。与明胶不同，淀粉也在高酸度和高乳化沉淀温度的组合下有利地具有足够的稳定性。

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