Nord Kaolin Company

Cascade Corporation

Thiele Kaolin Company

Nord Naolin Company

Jerry L Curtis

Lester William House

Joseph C Shi

Roger Gaudreault

Kenneth A Johnson

Andres Vaska

Janet Woodward

Timothy L Salter

Henry Agbaje

A pigment composition containing titanium dioxide (TiO.sub.2) and calcined clay in a weight ratio of between about 30:70 and 70:30, preferably between about 35:65 and 45:55 that is substantially free of a functional microgel component has advantages over a similar pigment containing a functional microgel. The pigment composition contains an amount of epichlorohydrin dimethylamine condensate that is sufficient to cationize the pigment, and lacks a microgel component. It is liquid when agitated. Preferably the composition has a solids content greater than about 55%, and most preferably between about 59% and about 61%.

Cationized pigments and their use in papermaking

A flotation process for removing toner particles from photocopied paper which utilizes the following compound as a collector: ##STR1## wherein R is an alkyl, aryl, alkylaryl or allyl group having from 4-28 carbon atoms and, preferably from 6-10 carbon atoms, and M represents an alkali metal, or alkaline earth metal radical or a hydrogen atom.

Process for removing toners from photocopy paper using hydroxamate

Methods for reducing stickies and removing ink from wastepaper fiber wherein a cationic kaolin is added to a wastepaper fiber furnish under conditions such that the kaolin attaches to the stickies or the ink and the stickies or ink are removed from the furnish using a centrifugal cleaner.

Method for removing stickies from wastepaper using modified cationic

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.

Cationic pigments

An opacifying pigment with enhanced light scattering properties for use as a paper coating or filler material is produced by reacting kaolin in the presence of water with sodium hydroxide or potassium hydroxide at a temperature in excess of 60.degree. C. The kaolin is reacted with the hydroxide in a concentration to produce a molality of at least 0.1.

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Milledgeville, GA, United States of America

Jerry L Curtis