Preparation of shaped metal particles and their uses

摘要

The instant invention relates to shaped transition metal particles, in particular in the form of a dispersion in an aqueous and/or organic medium, the manufacture thereof and their use as an infrared (IR) absorbing agent, an IR curing agent for coatings, an additive in conductive formulations, an antimicrobial agent or for sensoring organic and/or inorganic compounds. Further, the invention relates to dispersions comprising said shaped particles and an aqueous and/or organic medium, such as a thermoplastic or crosslinkable polymer, as well as to antimicrobial compositions and products.

主权项

1. A method of manufacturing shaped transition metal particles, comprising:
a) adding a reducing agent to an aqueous mixture comprising a transition metal salt and a polymeric dispersant to obtain a colloidal dispersion; and subsequently b) treating the colloidal dispersion with a peroxide to form particles in the form of nanoplatelets,wherein
the aqueous mixture comprises the transition metal salt in a concentration of higher than 2 mmol per liter, the transition metal is selected from the group consisting of Cu, Ag, Au, Zn, Cd, Ti, Cr, Mn, Fe, Co, Ni, Ru, Rh, Pd, Os, Ir and Pt, and wherein the method excludes a process including each of steps (a), (c) and (d), and one of steps (b1) and (b2):
a) adding to an aqueous solution of the transition metal salt an acrylate or methacrylate monomer or oligomer, or a polyacrylate or polymethacrylate and a reducing agent to obtain a colloidal solution;b1) treating the colloidal solution with a peroxide; orb2) exposing the colloidal solution to UV- or visible light;c) adding a water soluble amine; andd) isolating nano-shaped transition metal particles or redispering nano shaped transition metal particles together with a dispersing agent in a liquid acrylate or methacrylate monomer.