Aqueous dispersions of silver particles

B - Operations – Transporting – 22 – F

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B22F 1/00 (2006.01) B22F 9/24 (2006.01)

Patent

CA 2745863

A method of preparing an aqueous dispersion comprising silver particles of mean diameter from 0.5 to 25 nm by weight and an aqueous carrier liquid, including the steps of i) providing a mixture comprising at least one silver salt, aqueous carrier liquid and a stabiliser for the particles ii) contacting the mixture with a non-ionic or covalent reducing agent to form a reaction mixture iii) causing the at least one silver salt to react with the reducing agent to form a dispersion comprising silver particles and acid wherein step iii) is partly or completely performed in the presence of anion exchange resin whereby the acid is exchanged for a hydroxide ion from the resin and/or is sorbed by the resin.

L'invention concerne un procédé de préparation d'une dispersion aqueuse comprenant des particules en argent dont le diamètre moyen est compris entre 0,5 et 25 nm en poids et un liquide porteur aqueux, qui consiste notamment i) à utiliser un mélange comprenant au moins un sel d'argent, un liquide porteur aqueux et un stabilisateur destiné aux particules, ii) à mettre le mélange en contact avec un agent réducteur non ionique ou covalent pour former un mélange réactif, iii) à amener les sels d'argent à réagir avec l'agent réducteur pour former une dispersion comprenant des particules en argent et de l'acide, cette étape étant partiellement ou complétement réalisée en présence d'une résine d'échange d'anions, l'acide étant échangé avec un ion d'hydroxyde à partir de la résine et/ou sorbé par la résine.

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