Patent ID: 6355694
Filing Date: 2002-03-12
Classification: C01G,C01P,G02B,Y10S,Y10T

Abstract:
A stable sol which comprises modified colloidal particles of a stannic oxideâ€”zirconium oxide complex having a particle diameter of 4.5-60 nm, wherein the particles are formed by coating complex colloidal particles of stannic oxideâ€”zirconium oxide having a bonded structure of stannic oxide colloidal particles and zirconium oxide colloidal particles at a ZrO2/SnO2 ratio of 0.02-1.0 based on weights of these oxides and having a particle diameter of 4-50 nm as nuclei, with colloidal particles of a tungsten oxideâ€”stannic oxideâ€”silicon dioxide complex having a WO3/SnO2 weight ratio of 0.1-100, a SiO2/SnO2 weight ratio of 0.1-100, and having a particle diameter of 2-7 nm, and wherein the sol contains 2-50% by weight of tot al metal oxides.