Surface-modified inorganic fillers and pigments (ii)

C - Chemistry – Metallurgy – 09 – C

Patent

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Details

C09C 3/00 (2006.01) C08K 9/08 (2006.01) D21H 17/69 (2006.01) D21H 19/38 (2006.01)

Patent

CA 2627800

The invention relates to a method for producing surface-modified inorganic fillers or pigments having a desired grain size. Said method is characterized in that filler or pigment slurries of inorganic fillers or pigments having a given grain size are ground to the desired filler or pigment grain size in a vertical mill using polymer dispersions, previously known auxiliary grinding agents, and/or dispersing agents at an amount of 0.1 to 4.0 percent by weight (active substance) relative to the fillers or pigments, as well as grinding balls having an equivalent diameter of up to 5 mm, under the effect of pressures and shearing forces at a temperature of the grinding material of at least 50 ~C, and the binding agents of the polymer dispersions are rubbed onto the fillers or pigments and are provided with a polymer coating. Also disclosed are the fillers or pigments obtained by means of the inventive method, the use thereof for producing emulsion paints, adhesives, coatings, or spreading materials for the paper industry, especially coatings or spreading materials for different segments of the paper industry, such as sheet offset, web offset, intaglio printing, cardboard, and special papers.

L'invention concerne un procédé de fabrication de charges et pigments anorganiques modifiés en surface, de granulométrie souhaitée, caractérisé en ce que des suspensions de charges ou de pigments de granulométrie donnée sont broyées sous l'effet de forces de compression et de cisaillement, à l'aide de dispersions polymères, d'auxiliaires de broyage connus et/ou d'agents de dispersion, dans une quantité de 0,1 à 40 % en poids (substance active) par rapport aux charges et pigments, et de billes de broyage présentant un diamètre équivalent de 5 mm max., dans un broyeur vertical à une température d'au moins 50 °C, de manière à atteindre une granulométrie souhaitée des charges ou pigments, et en ce que les liants des dispersions polymères sont appliqués sur les charges ou pigments de manière à pourvoir ceux-ci d'un revêtement polymère. L'invention concerne également les charges ou pigments ainsi obtenus ainsi que leur utilisation pour la fabrication de peintures de dispersion, d'adhésifs, de revêtements ou de pâtes à enduire destinés à l'industrie du papier, notamment de revêtements ou de pâtes à enduire destinés à différentes branches de l'industrie du papier, telles que l'offset à feuilles, l'offset à bobines, l'impression en creux, le carton et les papiers spéciaux.

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