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US5013641A Formation of tabular silver halide emulsions utilizing high pH digestion 失效
使用高pH消解形成片状卤化银乳剂

Formation of tabular silver halide emulsions utilizing high pH digestion
摘要:
The invention is generally accomplished by providing a tabular silver halide emulsion formation process in which the pH is controlled to greater than 9 by the addition of an alkali base prior to digesting to form uniform nucleated silver bromide particles. In a particularly preferred process the emulsion is adjusted to a pH greater than 9 by the use of sodium hydroxide, digestion takes place in between 3 and 7 minutes, and the emulsion making is completed in less than 100 minutes without the use of ammonium hydroxide. The emulsions formed are suitable for x-ray films and produce the image tone required by radiologists.
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