Method for fabricating impermeable porous particles
AssigneeEastman Kodak Company
InventorsKevin D. Lofftus, John Leonard Muehlbauer, Mridula Nair
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Abstract
A method for preparing core/shell particles includes forming a suspension of ethylenically unsaturated monomer droplets containing one or more monomers and a porogen in an aqueous medium containing a first stabilizer and a polymerization initiator, wherein at least one of the monomers is a cross-linking monomer, and wherein the first stabilizer is an inorganic colloid. The method further includes polymerizing the one or more monomers to form core/shell particles having a core of a porous polymer and a polymeric shell having a shell thickness of at least 5 nm, wherein any pores in the polymeric shell have a diameter of less than 2 nm.
Claims5
A method for preparing core/shell particles comprising:
- a) forming a suspension of ethylenically unsaturated monomer droplets containing one or more monomers and a porogen in an aqueous medium containing a first stabilizer, a polymerization initiator, and a promoter species, wherein at least one of the one or more monomers is a cross-linking monomer, and wherein the first stabilizer is an inorganic colloid;
- b) polymerizing the one or more monomers to form core/shell particles comprising a porous core of a porous polymer and an impermeable polymeric shell having a shell thickness of at least 5 nm, and having the first stabilizer disposed thereon;
- c) removing the porogen;
- and
- d) removing the first stabilizer that is disposed on the impermeable polymeric shell of the core/shell particles;
- and optionally
- e) forming a film-forming latex coating over the core/shell particles after removing the first stabilizer,
- wherein the porogen includes two or more solvents, and one of the solvents has a greater miscibility in water than the one or more other solvents.
Dependencies are inferred from the claim text.