Hydrophilic treatment of pigments
AssigneeVideojet Systems International, Inc.
InventorWing Sum Vincent Kwan
Life of this patent
Estimating the term…
Abstract
A surface coordinating agent is allowed to contact an aqueous slurry of transition metal-containing pigment particles to increase the hydrophilicity of the surface of such particles. The modified pigment particles disperse easily in a wide variety of solvents, and provide stable, dispersions having a small mean pigment particle size and narrow particle size distribution.
Claims29
A method for preparing hydrophilic modified pigment particles, selected from the group consisting of transition metal containing pigment particles, transition metal oxide containing pigment particles, and complexes of transition metals or transition metal oxides, said method comprising contacting an aqueous slurry of said pigment particles with a surface coordinating agent selected from the group consisting of phenol compounds having at least one additional polar group, compounds containing a 1,2 diketo moiety and at least one polar group, compounds containing a 1,3-diketo moiety and at least one polar group, compounds containing a beta-hydroxy-keto moiety and at least one polar group, and compounds containing a phosphonic acid moiety and at least one other polar group.
A method of preparing hydrophilic modified pigment particles, comprising:
- (a) preparing an aqueous slurry of pigment particles selected from the group consisting of transition metal containing pigment particles, transition metal oxide containing pigment particles, and complexes of transition metals or transition metal oxides, such that the pigment particles are present in an amount from about 1% to about 20% by weight of the slurry;
- (b) adding a surface coordinating agent selected from the group consisting of phenol compounds having at least one additional polar group, compounds containing a 1,2 diketo moiety and at least one polar group, compounds containing a 1,3-diketo moiety and at least one polar group, compounds containing a beta-hydroxy-keto moiety and at least one polar group, and compounds containing a phosphonic acid moiety and at least one other polar group, to the slurry in an amount less than about 10% by weight of the pigment particles;
- (c) mixing the surface coordinating agent into the slurry to obtain modified pigment particles;
- and
- (d) recovering and drying the modified pigment particles.
A hydrophilic pigment dispersion, comprising:
- (a) pigment particles selected from the group consisting of transition metal containing pigment particles, transition metal oxide containing pigment particles, and complexes of transition metals or transition metal oxides;
- (b) a surface coordinating agent selected from the group consisting of phenols having at least one additional polar group, compounds containing a 1,2 diketo moiety and at least one polar group, compounds containing a 1,3-diketo moiety and at least one polar group, compounds containing a beta-hydroxy-keto moiety and at least one polar group, and compounds containing a phosphonic acid moiety and at least one other polar group;
- (c) an organic vehicle;
- and
- (d) one or more solvents, selected from the group consisting of ketones, alkanols, ethers, and esters.
A method for preparing hydrophilic modified pigment particles, selected from the group consisting of iron containing pigment particles, iron oxide containing pigment particles, and complexes of iron or iron oxides, said method comprising contacting an aqueous slurry of said pigment particles with a surface coordinating agent selected from the group consisting of phenols having at least one additional polar group, compounds containing a 1,2 diketo moiety and at least one polar group, compounds containing a 1 ,3-diketo moiety and at least one polar group, compounds containing a beta-hydroxy-keto moiety and at least one polar group, and compounds containing a phosphonic acid moiety and at least one other polar group.
A method of preparing hydrophilic modified pigment particles, comprising:
- (a) preparing an aqueous slurry of pigment particles selected from the group consisting of iron containing pigment particles, iron oxide containing pigment particles, and complexes of iron or iron oxides, such that the pigment particles are present in an amount from about 1% to about 20% by weight of the slurry;
- (b) adding a surface coordinating agent selected from the group consisting of phenols having at least one additional polar group, compounds containing a 1,2 diketo moiety and at least one polar group, compounds containing a 1,3-diketo moiety and at least one polar group, compounds containing a beta-hydroxy-keto moiety and at least one polar group, and compounds containing a phosphonic acid moiety and at least one other polar group, to the slurry in an amount less than about 10% by weight of the pigment particles;
- (c) mixing the surface coordinating agent into the slurry to obtain modified pigment particles;
- and
- (d) recovering and drying the modified pigment particles.
A hydrophilic pigment dispersion comprising:
- (a) pigment particles selected from the group consisting of iron containing pigment particles, iron oxide containing pigment particles, and complexes of iron or iron oxides;
- (b) a surface coordinating agent selected from the group consisting of phenols having at least one additional polar group, compounds containing a 1,2 diketo moiety and at least one polar group, compounds containing a 1,3-diketo moiety and at least one polar group, compounds containing a beta-hydroxy-keto moiety and at least one polar group, and compounds containing a phosphonic acid moiety and at least one other polar group;
- (c) an organic vehicle;
- and
- (d) one or more solvents, selected from the group consisting of ketones, alkanols, ethers, and esters.
Dependencies are inferred from the claim text.