Cationic pigments
AssigneeNord Kaolin Company
InventorsJerry L. Curtis, Kenneth A. Johnson, Lester W. House
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Abstract
This invention relates to structural aggregate pigment products that are cationic, and have improved wet-end retention. A method for converting anionic pigments to cationic pigments is also provided. More particularly, a structural aggregate pigment comprising a clay and/or titanium dioxide or other particulate components, and a functional microgel made from silicon and aluminum or zinc gel formers and a gelling agent such as calcium chloride, can be cationized by adding an effective amount of modified or unmodified epichlorhydrin dimethylamine condensate to a slurry of the structured pigment. The resulting cationic pigments have superior papermaking characteristics and a much improved retention.
Claims26
A pigment comprising:
- a structural aggregate of a particulate material and a microgel, and a modified or unmodified epichlorohydrin dimethylamine condensate, wherein said pigment is cationic.
A pigment composition made by treating an anionic structural aggregate pigment having a particulate component and a microgel component with a modified or unmodified epichlorohydrin dimethylamine condensate to cationize said pigment.
A method for cationizing a structured aggregate pigment having a microgel component, comprising the step of treating a slurry of the pigment with a modified or unmodified epichlorhydrin dimethylamine condensate.
Dependencies are inferred from the claim text.