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US 5,854,331 AGranted
Block copolymers of oxazolines and oxazines as pigment dispersants and their use in ink jet inks
AssigneeE. I. Du Pont de Nemours and Company
InventorsSheau-Hwa Ma, Jose N. Rodriguez-Parada
Life of this patent
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Abstract
Aqueous dispersions having improved stability and which are particularly well suited for use as aqueous ink jet ink compositions comprise an aqueous vehicle which comprises water or a mixture of water and an organic solvent; a particulate solid, preferably a pigment; and a polyoxazoline or polyoxazine dispersant selected from the group of AB, ABA, and BAB block copolymers wherein the A block is hydrophobic, and the B block is hydrophilic, and wherein the polymer as a whole has a solubility in the aqueous vehicle of at least 0.1 wt % at 25.degree. C.
Claims10
An aqueous dispersion comprising:
- (a) an aqueous vehicle,
- (b) a particulate solid, and
- (c) a block polymer dispersant selected from the group consisting of AB, ABA, and BAB block copolymers wherein the A block is hydrophobic, and the B block is hydrophilic, wherein the polymer as a whole has a solubility in the aqueous vehicle of at least 0.1 wt % at 25.degree. C.;
- (d) said block polymeric dispersant being comprised of monomers selected from the group consisting of 2-substituted oxazoline monomers, 2-substituted oxazine monomers, and mixtures thereof.
1 more element
Dependencies are inferred from the claim text.