Process to form modified pigments
AssigneeCabot Corporation
InventorsSze-Ming Lee, Dave S. Pope
Life of this patent
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Abstract
A method of forming a modified pigment comprising a pigment having attached at least one polymeric group is described. In one embodiment, a polymer, a pigment, a linking agent, and an optional activating agent are combined, and the linking agent is reacted with the polymer and the pigment to form the modified pigment. In another embodiment, a polymer melt is formed comprising a polymer and an optional plasticizer, and the polymer melt, a pigment, and an optional activating agent are combined, in any order, under high-intensity mixing conditions. Also disclosed are modified pigments having specific properties and inkjet ink compositions comprising them.
Claims42
A method of forming a modified pigment comprising a pigment having attached at least one polymeric group, the method comprising the steps of:
- i) combining, in any order, a polymer, a pigment, a linking agent, and an optional activating agent, wherein the linking agent comprises a first reactive group and a second reactive group, the first reactive group is capable of reacting with the pigment and the second reactive group is capable of reacting with the polymer, and
- ii) reacting the linking agent with the polymer and the pigment to form the modified pigment.
A method of forming a modified pigment comprising a pigment having attached at least one polymeric group, the method comprising the steps of:
- i) forming a polymer melt comprising a polymer and an optional plasticizer;
- ii) combining, in any order, a pigment, an optional activating agent, and the polymer melt under high-intensity mixing conditions;
- and
- iii) reacting the polymer and the pigment to form the modified pigment. wherein the polymer comprises at least one reactive group capable of reacting with the pigment.
A modified pigment comprising a pigment having attached at least one polymeric group, wherein the modified pigment has a polymer attachment level of at least about 20% and an average particle size not greater than about 150 nm.
A modified pigment comprising a pigment having attached a least one polymeric group, wherein the modified pigment has an average particle size not greater than about 150 nm and a large particle count not greater than about 5.0×108.
An inkjet ink composition comprising a) a liquid vehicle and b) a modified pigment comprising a pigment having attached at least one polymeric group, wherein the modified pigment has a polymer attachment level of at least about 20% and an average particle size not greater than about 150 nm.
An inkjet ink composition comprising a) a liquid vehicle and b) a modified pigment comprising a pigment having attached a least one polymeric group, wherein the modified pigment has an average particle size not greater than about 150 nm and a large particle count not greater than about 5.0×108.
Dependencies are inferred from the claim text.