Pigment dispersions containing dispersants prepared by...

Details Pigment dispersions containing dispersants prepared by... Pigment dispersions containing dispersants prepared by...

C - Chemistry, Metallurgy

09

B

C09B 67/00 (2006.01) C09B 67/20 (2006.01) C09B 67/46 (2006.01)

Patent

CA 2394641

A pigment dispersion comprising pigment, an aqueous carrier selected from water and a mixture of water and at least one organic solvent, and a pigment dispersant is described. The pigment dispersant is prepared by controlled radical polymerization, e.g., atom transfer radical polymerization, of a radically polymerizable monomer in the presence of a polymeric initiator having at least one radically transferable group. The polymeric initiator forms the polymeric backbone segment of the pigment dispersant, and the monomer forms polymeric segments that are pendent to the polymeric backbone segment. The pigment dispersant has comb-like architecture in which the polymeric backbone segment is hydrophobic, and at least a portion of each pendent polymeric segment is hydrophilic.

L'invention concerne une dispersion pigmentaire comprenant des pigments, un support aqueux sélectionné dans l'eau et un mélange d'eau et d'au moins un solvant organique, ainsi qu'un dispersant pigmentaire. Celui-ci est préparé par polymérisation radicalaire contrôlée, par exemple, par une polymérisation radicalaire de transfert d'atome, d'un monomère à polymérisation radicalaire en présence d'un inhibiteur polymérique possédant au moins un groupe pouvant être transféré de manière radicalaire. L'inhibiteur polymérique forme le segment du squelette polymérique du dispersant pigmentaire et le monomère forme les segments polymériques latéraux du segment du squelette polymérique. Le dispersant pigmentaire présente une architecture du type peigne dans laquelle le segment du squelette polymérique est hydrophobe, et au moins une partie de chaque segment polyymérique latéral est hydrophile.

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