SILICIUMDIOXIDDISPERSION

摘要

Providing a SiO2 dispersion in which the SiO2-containing phase is such that the average particle size (dmax) of the SiO2 as measured by Small Angle Neutron Scattering (SANS) at a maximum half width intensity of the distribution curve has a specific value at 1.5dmax. A SiO2 dispersion containing: (A) an external flowable phase containing polymerizable monomers, oligomers and/or polymers; and (B) a disperse SiO2-containing phase is such that the average particle size (dmax) of the SiO2 as measured by Small Angle Neutron Scattering (SANS) at a maximum half width intensity of the distribution curve of 1.5dmax is 3-50 nm. An Independent claim is also included for production of the dispersion by: (i) polycondensing an aqueous silicate solution to 3-50 nm particle size; (ii) adjusting to an alkaline pH; (iii) optionally concentrating the sol; (iv) mixing with the external phase ingredients; and (v) optionally removing the water or other solvents.