Nano silver-zinc oxide composition

US8673367B2 · kind B2 · utility

Assignee

• POLYMERS CRC LIMITED · AU

Inventors

• Thomas Weiß · Ilvesheim, DE
• Rainer Xalter · Basel, CH

Key dates

• Filing date: Aug 16, 2010
• Grant date: Mar 18, 2014
• Expiry date: Aug 25, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/12
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A new composite comprises (a) 10.1-99.9% by weight of elemental Ag and (b) 0.1-89.9% by weight of ZnO, wherein the sum of (a) and (b) makes 90% or more by weight of the composite and wherein the elemental Ag has a primary particle size of 10-200 nm and/or the ZnO has a primary particle size of 0.1 to below 50 μm and/or the composite has a particle size distribution of 0.1-50 μm and/or a BET surface area of 10-100 m2/g. The novel composite may be obtained by the steps (i) mixing a first mixture of at least one Ag-salt with a second mixture of at least one Zn-salt thereby forming a third mixture of Ag- and Zn-salts, (ii) adding the third mixture to a mixture of a carbonate source, (iii) co-precipitating of the Ag- and Zn-carbonates formed in step (ii), (iv) washing of the Ag- and Zn-carbonates and (v) thermal decompositing of the Ag- and Zn-carbonates. The novel composites are useful to impart antimicrobial properties to surfaces, articles or bulk compositions, especially to membrane systems for gas- or water separation.