A PROCESS FOR THE PREPARATION OF HIGHLY STABLE SOILE PRECURSOR MATERIAL USEFUL FOR THE TUNGSTEN OXIDE BASED ELECTROCHROMIC COATINGS

摘要

The present invention relates to a process for the preparation of solid precursor material useful for the tungsten oxide based electrochromic coatings. The process results in a precursor material in a solid form with long term stability of at least one year and even more with the additives under refrigerated storage conditions. Further, it yields a precursor material by a process preferably not involving steps requiring very high or low temperature maintained for more than 4 to 5 hours.