发明名称 |
Preparations of high bromide photographic emulsions with starch peptizer and oxidizing agent |
摘要 |
<p>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.</p> |
申请公布号 |
EP1217427(A2) |
申请公布日期 |
2002.06.26 |
申请号 |
EP20010204414 |
申请日期 |
2001.11.19 |
申请人 |
EASTMAN KODAK COMPANY |
发明人 |
MASKASKY, JOE EDWARD;SCACCIA, VICTOR P. |
分类号 |
G03C1/005;G03C1/015;G03C1/035;G03C1/04;(IPC1-7):G03C1/005 |
主分类号 |
G03C1/005 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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