PROCESS FOR MANUFACTURE OF NANOMETRIC, MONODISPERSE, AND STABLE METALLICSILVER AND PRODUCT OBTAINED THEREFROM

The present invention relates to a procedure for preparation by a wet red uction method of nanometric particles of metallic silver, with diameter rang ing from 1 to 100 nm and an average diameter of 20 to 40 nm, with monodisper sion characteristics, stabilities exceeding 12 months and in a wide range of concentrations. The process comprises 4 stages: a) preparation of the reduc ing agent solution, taken from the tannins group and preferably tannic acid; b) preparation of a solution of soluble silver salts; c) reaction and, d) l iquid-solid separation; the particle size is determined by the nature of the reducing agent and by the pH control of the currents. The final stage is de signed for separating and concentrating the material after which the user ca n prepare the product for integration thereof in the desired medium. The par ticles obtained are redispersable in different media, such as water, alkidal ic and phenolic resins, nitrocellulose, polyeurethane, vinylics, acrylics, a lcohols, and in a wide range of organic and polymeric products such as high and low density polyethylene, Nylon, ABS and/or mixtures thereof.