초록 ▼

A bulked kaolin pigment is prepared by mixing a small but effective amount of a water-soluble cationic material such as a cationic polyelectrolyte flocculant with a kaolin clay pigment in the presence of water. The resultant bulked clay product can be dispersed to form high solids clay-water slurrie

A bulked kaolin pigment is prepared by mixing a small but effective amount of a water-soluble cationic material such as a cationic polyelectrolyte flocculant with a kaolin clay pigment in the presence of water. The resultant bulked clay product can be dispersed to form high solids clay-water slurries useful in making aqueous coating colors suitable for manufacturing lightweight coated publication papers or the pigment can be used as a filler for paper webs. Slurries having stable viscosity during storage and at elevated temperature are prepared by using as the dispersant an anionic sulfonated disperant such as a lignosulfonate or a naphthalene formaldehyde sulfonate complex.

대표청구항 ▼

A heat stabilized fluid aqueous slurry comprising chemically bulked hydrous kaolin clay pigment particles obtained by adding a cationic organic polymeric material to hydrous kaolin clay in the presence of water to flocculate said clay and a dispersant effective amount of a combination of dispersants

A heat stabilized fluid aqueous slurry comprising chemically bulked hydrous kaolin clay pigment particles obtained by adding a cationic organic polymeric material to hydrous kaolin clay in the presence of water to flocculate said clay and a dispersant effective amount of a combination of dispersants consisting essentially of a polyacrylate salt and a water soluble anionic sulfonate, said slurry having greater heat stability than it would have using said polyacrylate salt as the sole dispersant.