Potassium cesium tungsten bronze particles

US8268202B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Marc Andrew Mamak · Mason, US
• Urs Lehmann · Basel, CH
• Urs Stadler · Madison, US
• Ralf Knischka · Neustadt, DE

Key dates

• Filing date: Jun 30, 2010
• Grant date: Sep 18, 2012
• Expiry date: Oct 3, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K2003/2258
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Disclosed are potassium cesium tungsten bronze solid solution particles of the formula KxCsyWOz, where x+y≦1 and 2≦z≦3. The particles are for instance micron or nano scaled particles. Also disclosed are organic or inorganic compositions comprising an organic or inorganic substrate and incorporated therein the present potassium cesium tungsten bronze solid solution particles. The substrates are for instance plastics, coatings, inks, adhesives, ceramics or glass. Also disclosed is a method for the preparation of the present potassium cesium tungsten bronze solid solution particles, which method comprises mixing a suitable tungsten source with a salt of potassium and a salt of cesium to form a powder mixture and exposing the powder mixture to a plasma torch under a reducing atmosphere. The present tungsten bronze particles are suitable NIR absorbers and heat shielding additives.