Patent ID: 7812072

Claim:
A method of preparing an aromatic vinyl-cyanide vinyl copolymer-silica nanocomposite, the method comprising: mixing 100 parts by weight of a monomer mixture with about 0.5 to about 30 parts by weight of colloidal silica nanoparticles dispersed in a first organic solvent to form a first mixture, the monomer mixture comprising an aromatic vinyl monomer and a cyanide vinyl monomer; and subjecting the first mixture to polymerization to form said aromatic vinyl-cyanide vinyl copolymer-silica nanocomposite including a single aromatic vinyl-cyanide vinyl copolymer matrix formed of said monomer mixture comprising said aromatic vinyl monomer and said cyanide vinyl monomer and said colloidal silica nanoparticles distributed in the single aromatic vinyl-cyanide vinyl copolymer matrix.