Methods of making dispersible additives for polymeric materials

Details Methods of making dispersible additives for polymeric materials Methods of making dispersible additives for polymeric materials

C - Chemistry, Metallurgy

08

K

C08K 9/04 (2006.01) C08J 3/20 (2006.01) C08J 3/22 (2006.01) D01D 5/28 (2006.01) D01F 1/04 (2006.01) D02G 3/02 (2006.01)

Patent

CA 2208225

Additives for polymeric compositions are prepared by coated a pigments with a dispersant, and thereafter dispersing the dispersant-coated pigment in a liquid nonaqueous polymeric carrier. Preferably, the dispersant-coated pigment is spraydried. That is, most preferably, an aqueous dispersion of the pigment and dispersant is subjected to a spray-drying operation so as to obtain pigment coated with the dispersant. The dispersant-coated pigment has an average particle size of about 5 µm or greater, but is capable of breaking apart to average particle sizes of about 1 µm or less when dispersed in a polymeric host material.

Additifs pour compositions polymères préparés par revêtement de pigments à l'aide d'un dispersant, puis par dispersion de ce pigment dans un véhicule polymère liquide non aqueux. Le pigment revêtu de dispersant est de préférence pulvérisé à sec. On préfère avant tout que la dispersion aqueuse du pigment et du dispersant soit soumise à une pulvérisation à sec de façon à obtenir un pigment revêtu du dispersant. Ce dernier pigment mesure en moyenne environ 5 microns ou plus, mais peut se diviser en particules plus petites d'environ 1 micron ou moins, après dispersion dans une matière polymère hôte.

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