Patent ID: 7897138

Claim:
A process for producing an aqueous sol of diantimony pentoxide, which comprises mixing diantimony trioxide, Sb 2 O 3 , and an aqueous hydrogen peroxide solution to form a mixture comprising said Sb 2 O 3 and aqueous hydrogen peroxide solution, heating said mixture to a set temperature of 50-80° C., reacting said mixture for a time of 2.5-9 hours and at a temperature which is no greater than 10° C. above said set temperature to obtain a sol having diantimony pentoxide particles dispersed in the aqueous medium, wherein said diantimony pentoxide particles have a primary particle size of 2-50 nm and upon said reacting, said sol has no greater than 5 wt % of diantimony trioxide, relative to the total amount of diantimony trioxide and diantimony pentoxide.