TITANIA SOL CHELATED WITH AN ORGANIC COMPLEX, A METHOD THEREOF, AND A COMPOSITION INCLUDING SAID TITANIA SOL FOR FORMING MEDIUM, HIGH, SUPER-HIGH REFRACTIVE INDEX COATING LAYER

摘要

A method for preparing a titania-organic complex sol as a filler for a composition for forming a medium or higher refraction index coating film is provided to realize excellent compatibility with an organic solvent, shelf stability and monodisperse property, to allow dispersion of a high concentration of titania nanoparticles, and to maintain transparency upon redispersion in an organic solvent. A method for preparing a titania-organic complex sol comprises the steps of: (a) heating a reaction solution containing a titania precursor in a reaction solvent to a sol-gel reaction temperature; (b) adding an acid catalyst to the reaction solution and carrying out a sol-gel reaction to provide a titania sol; (c) adding an organic complex to the titania sol and carrying out a reaction to produce a titania-organic complex sol; (d) drying the reaction solution containing the titania-organic complex sol under an ambient pressure, decreased pressure or freeze-drying condition; and (e) redispersing the dried titania-organic complex in a dispersion solvent.