Electrostatic ink compositions
AssigneeHP Indigo B.V.
InventorsHaim Cohen, Igor Shutyi, Reut Avigdor
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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.
Claims15
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 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.
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 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.
A substrate having printed thereon:
- a layer formed from a thermoplastic resin having acidic side groups;
- wherein globular particles comprising a hydrocarbon having a drop point, measured according to ASTM D3954-15, of at least 120° C., the globular particles protruding above the surface of the thermoplastic resin.
Dependencies are inferred from the claim text.