Cationic pigments

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C - Chemistry, Metallurgy

09

C

C09C 1/00 (2006.01) C09C 1/36 (2006.01) C09C 3/00 (2006.01) C09C 3/04 (2006.01) D21H 17/69 (2006.01)

Patent

CA 2139775

2139775 9401499 PCTABS00030 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.

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