Cationic titanium dioxide pigments
AssigneeCPM Industries
InventorGlenn R. Evers
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Abstract
A composition containing cationic pigment particles includes titanium dioxide particles to which are bound a first water-soluble cationic polymer and cationic polymer latex particles. In some embodiments the cationic latex is made by treating an anionic latex with a second water-soluble cationic polymer, which may be the same as or different from the first water-soluble cationic polymer. The compositions may be used in papermaking applications, both for internal addition and or coatings.
Claims30
A composition comprising cationic pigment particles, the pigment particles comprising:
- a) titanium dioxide particles;
- b) a first water-soluble cationic polymer bound to the titanium dioxide particles in an amount sufficient to render the titanium dioxide particles cationic;
- and
- c) cationic polymer latex particles bound to the titanium dioxide particles.
A method of making a composition comprising cationic pigment particles, the method comprising:
- a) mixing together titanium dioxide particles and an aqueous first water-soluble cationic polymer, thereby providing cationic titanium dioxide particles;
- and
- b) mixing the product of step a) with a cationic polymer latex.
A composition comprising cationic pigment particles made by a method comprising:
- a) mixing together titanium dioxide particles and an aqueous first water-soluble cationic polymer, thereby providing cationic titanium dioxide particles;
- and
- b) mixing the product of step a) with a cationic polymer latex.
A method of making paper, comprising contacting pulp fibers with a composition comprising cationic pigment particles, the pigment particles comprising:
- a) titanium dioxide particles;
- b) a first water-soluble cationic polymer bound to the titanium dioxide particles in an amount sufficient to render the titanium dioxide particles cationic;
- and
- c) cationic polymer latex particles, bound to the titanium dioxide particles.
Dependencies are inferred from the claim text.