Aqueous polymer nanocomposite dispersion comprises polymerized product of monomers and an aqueous dispersion of silica nanoparticles, in an emulsion form. The monomers are added in to a reactor containing the nanoparticle dispersion. The aqueous dispersion e.g. does not contain cationic organic compound like monomers, dispersants or primers that work as a stabilizer for the dispersed silica, is stable at a pH of 2-10 and does not form aggregates, agglomerates and/or sedimentation. Aqueous polymer nanocomposite dispersion comprises polymerized product of monomers and an aqueous dispersion of silica nanoparticles, in an emulsion form. The monomers are added into a reactor containing the nanoparticles dispersion. The aqueous dispersion does not contain cationic organic compound like monomers, dispersants or primers that work as a stabilizer for the dispersed silica, is stable at a pH of 2-10, does not form aggregate, agglomerate and/or sedimentation and contains aluminum modified anionic nanoparticles of 5-50 nm in size. The polymerization is carried out in the presence of an organic primer system i.e. free of all ionic groups. Independent claims are included for: (1) a process of preparing the dispersion comprising adding the anionic silica nanoparticle dispersion in to a polymerization reactor, (semi-continuously) adding the monomers to form a reaction mixture, and polymerizing the reaction mixture in the presence of the organic primer system; and (2) a coating composition comprising the dispersion.
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