Electrostatic ink compositions
AssigneeHP Indigo B.V.
InventorsHaim Cohen, Igor Shutyi, Reut Avigdor
Life of this patent
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Abstract
Herein is disclosed a liquid electrostatic ink composition. The composition may comprise a liquid carrier having dispersed therein: chargeable particles comprising a thermoplastic resin having acidic side groups; and globular particles comprising a hydrocarbon having a drop point, measured according to ASTM D3954-15, of at least 120° C., the globular particles having a D50 of from 2 μm to 7 μm and a D90 of 10 μm or less, the D50 and D90 being measured in the liquid carrier using laser diffraction and volume distribution, in accordance with ISO13220.
Claims12
A liquid electrostatic ink composition comprising a liquid carrier having dispersed therein:
- chargeable particles comprising a thermoplastic resin having acidic side groups;
- and
- globular particles having a carbohydrate core and a shell surrounding the carbohydrate core, the carbohydrate core being a monosaccharide or a polysaccharide of a saccharide unit selected from the group consisting of ribose, arabinose, xylose, lyxose, allose, altrose, glucose, mannose, and galactose, and the shell being a hydrocarbon having a drop point, measured according to ASTM D3954-15, of at least 120° C., the globular particles having a D50 of from 2 μm to 7 μm and a D90 of 10 μm or less, the D50 and D90 being measured in the liquid carrier using laser diffraction and volume distribution, in accordance with ISO13220, wherein the hydrocarbon is polyethylene.
A method of forming an electrostatic ink composition comprising:
- grinding a thermoplastic resin having acidic side groups in a liquid carrier to provide a slurry comprising particles comprising the thermoplastic resin dispersed in the liquid carrier;
- adding globular particles to the slurry, the globular particles having a carbohydrate core and a shell surrounding the carbohydrate core, the carbohydrate core being a monosaccharide or a polysaccharide of a saccharide unit selected from the group consisting of ribose, arabinose, xylose, lyxose, allose, altrose, glucose, mannose, and galactose, and the shell comprising a hydrocarbon having a drop point, measured according to ASTM D3954-15, of at least 120° C., and the globular particles having a D50 of from 2 μm to 7 μm and a D90 of 10 μm or less, the D50 and D90, when measured in the liquid carrier using laser diffraction and volume distribution, in accordance with ISO13220, wherein the hydrocarbon is polyethylene;
- wherein the globular particles are mixed in the slurry without reducing the particle size of the globular particles.
A substrate having printed thereon:
- a layer formed from a thermoplastic resin having acidic side groups;
- wherein globular particles protrude above the surface of the thermoplastic resin, the globular particles having a carbohydrate core and a shell surrounding the carbohydrate core, the carbohydrate core being a monosaccharide or a polysaccharide of a saccharide unit selected from the group consisting of ribose, arabinose, xylose, lyxose, allose, altrose, glucose, mannose, and galactose, and the shell comprising a hydrocarbon having a drop point, measured according to ASTM D3954-15, of at least 120° C., wherein the hydrocarbon is polyethylene.
Dependencies are inferred from the claim text.