Method of making a pigment dispersion
AssigneeHewlett-Packard Development Company, L.P.
InventorsSivapackia Ganapathiappan, Howard S. Tom, Hou T. Ng
Life of this patent
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Abstract
A method for making a pigment dispersion can include dispersing pigment particles in an aqueous liquid medium to form a dispersion, adding a first monomer to form a dispersive coating on the pigment particles, adding a second monomer to the dispersion, and forming a polymer coating on the surface of the pigment particles by polymerizing the second monomer with the first monomer, wherein the polymer coating includes at least one urethane linkage or urea linkage.
Claims20
A method for making an encapsulated pigment dispersion, comprising:
- dispersing pigment particles in an aqueous liquid medium to form a dispersion;
- adding a first monomer to the dispersion, wherein the first monomer forms a dispersive coating on the pigment particles;
- adding a second monomer to the dispersion after formation of the dispersive coating, the adding of the second monomer to the dispersion beginning polymerization in the dispersion of the second monomer with the first monomer;
- and
- forming a polymer coating on the surface of the pigment particles by polymerizing the second monomer with the first monomer in the dispersive coating, thereby creating encapsulated pigment particles;
- wherein the polymer coating includes at least one urethane linkage or urea linkage.
A precursor to an encapsulated pigment dispersion, comprising:
- an aqueous liquid medium;
- pigment particles dispersed in the aqueous liquid medium, wherein the pigment particles are coated with a first monomer and are dispersed by the first monomer;
- and
- a second monomer added to the aqueous liquid medium and to be polymerized with the first monomer previously coated on the pigment particles to produce a polymer coating encapsulating the pigment particles and including at least one urethane linkage;
- wherein the pigment particles, the first monomer and the second monomer are present in a weight percentage ratio of 1.0:1.5:0.5.
Dependencies are inferred from the claim text.