Patent ID: 7691910
Filing Date: 2010-04-06
Classification: B82Y,C01G,C01P

Abstract:
1. A production method of an acidic zirconia sol comprising zirconia particles (a) having a particle diameter ranging from 20 to 300 nm in a content of 90 to 50% by mass, based on the mass of all zirconia particles, and zirconia particles (b) having a particle diameter of less than 20 nm in a content of 10 to 50% by mass, based on the mass of all zirconia particles, the production method comprising: a first process in which an alkaline zirconia sol (A) and a zirconium salt (B) are mixed in a mass ratio (Bs/As) ranging from 0.2 to 5.0 of a mass of a solid content (Bs) which is converted into an amount of ZrO a second process in which the resultant mixture is reacted at 80 to 250° C. so as to produce the acidic zirconia sol.