To produce metallic superfine particles stably present, furthermore easy to work, wide in the selection range in the product forms and excellent in operability by adding thiol or a thiol soln. to a soln. obtd. by reducing a soln. in which metallic salt and amine are dissolved.
As metallic salt, the halide of gold or the like are given, as amine, ethylamine or the like are given, and, as a solvent, acetone or the like are given. In the case the soln. thereof is added with the hydroxide of iodine or the like as a reducing agent, the soln. contg. metallic superfine particles whose surfaces are protected by amine can be obtd. In the case this is added with thiol or a thiol soln., the metallic superfine particles whose surfaces are protected by thiol can be obtd. As thiol, methanethiol or the like are given. The thiol soln. is the one in which thiol is dissolved in the above solvent. Since the obtd. superfine particles can be discharged as powder without being coagulated with each other, the mixing thereof with the other compositional components and superfine particles is made easy.
HAYASHI TOYOJI
KAWASEKI TAKASHI
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