U.S. 8,633,263 B2
3M has received a patent for a composition comprised of an aqueous continuous liquid phase; and core-shell particles dispersed in the aqueous continuous liquid phase, each core-shell particle comprising a polymer core surrounded by a shell consisting essentially of nonporous spherical silica particles disposed on the polymer core, wherein the polymer core comprises at least one polymer, wherein a weight ratio of a total amount of the nonporous spherical silica particles in the composition to a total amount of the at least one polymer in the composition is in a range of from 85:15 to 95:5, wherein the nonporous spherical silica particles have a volume average particle diameter of 60 nanometers or less, and wherein the composition has a pH value of less than 5.
