Synthetic microspheres and methods of making same

US7651563B2 · kind B2 · utility

Assignee

• James Hardie Technology Limited · IE

Inventors

• Amlan Datta · Ashland, US
• Hamid Hojaji · Kensington, US
• David L. Melmeth · Fontana, US
• James A. McFarlane · Sydney, AU
• Thinh Pham · Sydney, AU
• Noel E. Thompson · Parramatta, AU
• Huagang Zhang · Yucaipa, US

Key dates

• Filing date: Aug 25, 2003
• Grant date: Jan 26, 2010
• Expiry date: Aug 25, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2996
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A building product incorporating synthetic microspheres having a low alkali metal oxide content is provided. The synthetic microspheres are substantially chemically inert and thus a suitable replacement for cenospheres derived from coal combustion, particularly in caustic environments such as cementitious mixtures. The building product can have a cementitious matrix such as a fiber cement product. The synthetic microspheres can be incorporated as a low density additive and/or a filler for the building product and/or the like.