Patent ID: 7563827
Filing Date: 2009-07-21
Classification: B82Y,C01G,C01P,G02B,Y10S

Abstract:
1. A process for producing a modified metal oxide sol, comprising: producing a stannic oxide aqueous sol comprising stannic oxide particles, wherein sizes of the stannic oxide particles are from 4 to 50 nm, and a SnO hydrothermally treating the stannic oxide aqueous sol at a temperature of from 100 to 300° C.; mixing the hydrothermally treated stannic oxide aqueous sol with an aqueous solution of an oxyzirconium salt having a concentration of from 0.5 to 50 wt % as calculated as ZrO heating the obtained mixed liquid at a temperature of from 60 to 100° C. for from 0.1 to 50 hours to prepare a stannic oxide-zirconium oxide composite aqueous sol having particle sizes of from 4 to 50 nm; mixing the heated stannic oxide-zirconium oxide composite aqueous sol with an aqueous medium comprising Sb aging the aqueous mixture of the stannic oxide-zirconium oxide composite aqueous sol and aqueous medium comprising Sb contacting the aged aqueous mixture with an anion exchanger to remove anions present in the sol; wherein a weight ratio of ZrO an alkylamine/Sb a weight ratio of Sb