Patent ID: 7144944

Claim:
A coating composition for an ink jet recording medium comprising: i) colloidal silica; and ii) a synthetic resin emulsion composition having two or more glass transition (Tg) points, wherein said emulsion composition includes a) a first polymeric portion which includes the residues of a radical-polymerizable unsaturated monomer having a silyl group, and another radical polymerizable unsaturated monomer; and b) a second polymeric portion which also includes the residues of a radical polymerizable unsaturated monomer having a silyl group, and another radical polymerizable unsaturated monomer, wherein the first polymeric portion is constituted to provide the emulsion composition with a first Tg point, and the second polymeric portion is constituted to provide the emulsion composition with a second Tg point which is dissimilar from the first Tg point, and wherein the first polymeric portion and second polymeric portion are separately emulsion polymerized in the presence of at least one radical polymerizable surfactant, such that the radical polymerizable surfactant is present in amounts of from 0.3 to 10% by weight, based on total monomers used in the emulsion composition.