método para a preparação de uma dispersão aquosa, dispersão aquosa, dispersão aquosa livre de ácido das partículas e prata, composição, composição de tinta e substrato

摘要

A method of preparing an aqueous dispersion comprising silver particles of mean diameter from 0.5 -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 stabilizer for the particles
ii) contacting the mixture with a 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.