Pigment dispersion, ink composition, inkset, and recording device
AssigneeSeiko Epson Corporation
InventorsTakashi Oyanagi, Keitaro Nakano
Life of this patent
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Abstract
A pigment dispersion containing a metal pigment, wherein the metal pigment contains plate-like particles, and in the case where the longitudinal diameter on the planar surface of the plate-like particle is X, the lateral diameter is Y, and the thickness is Z, the 50% average particle diameter R50 of a corresponding circle determined from the surface area in the X-Y plane of the plate-like particle is between 0.5 and 3 μm, and the condition R50/Z>5 is satisfied.
Claims16
An ink composition comprising a metal pigment, wherein the metal pigment contains plate-like particles, and in the case where the longitudinal diameter on the planar surface of the plate-like particle is X, the lateral diameter is Y, and the thickness is Z, the 50% average particle diameter R50 of a corresponding circle determined from the surface area in the X-Y plane of the plate-like particle is 3 μm or less, and the condition R50/Z>5 is satisfied;
- and
- wherein when applied to an inkjet recording device having L μm is the nozzle diameter of an inkjet head, the number of plate-like particles where a particle diameter R μm of a corresponding circle determined from the surface area in the X-Y plane of the plate-like particles satisfies a condition R>(L/5) being no more than 5% of a total number of the plate-like particles.
A recording device comprising:
- (a) an inkjet head with the diameter of the nozzle, the diameter of the nozzle is L μm, and
- (b) an ink composition comprising a metal pigment, wherein the metal pigment contains plate-like particles, and in the case where the longitudinal diameter on the planar surface of the plate-like particles is X, the lateral diameter is Y, and the thickness is Z, the 50% average particle diameter R50 of a corresponding circle determined from the surface area in the X-Y plane of the plate-like particles is 3 μm or less, and the condition R50/Z>5 is satisfied,
- wherein the number of plate-like particles where a particle diameter R μm of a corresponding circle determined from the surface area in the X-Y plane of the plate-like particles satisfies a condition R>(L/5) is no more than 5% of a total number of the plate-like particles.
Dependencies are inferred from the claim text.