US 11,745,515 B2
Liquid discharging apparatus and liquid discharging method
Itsuro Sasaki, Kanagawa (JP)
Assigned to Ricoh Company, Ltd., Tokyo (JP)
Filed by Itsuro Sasaki, Kanagawa (JP)
Filed on Oct. 28, 2021, as Appl. No. 17/512,889.
Claims priority of application No. 2020-190159 (JP), filed on Nov. 16, 2020.
Prior Publication US 2022/0153034 A1, May 19, 2022
Int. Cl. B41J 29/38 (2006.01); B41J 2/18 (2006.01)
CPC B41J 2/18 (2013.01) 15 Claims
OG exemplary drawing
 
1. A liquid discharging apparatus, comprising:
a storage storing an ink, the ink containing water, an organic solvent, at least two kinds of urethane resins, and titanium oxide; and
a liquid discharging head including:
an individual liquid chamber having a circulation flow path through which the ink is circulated,
a nozzle communicating with the individual liquid chamber and through which a liquid droplet of the ink is discharged,
wherein a content of the titanium oxide in the ink is 20% by mass or greater but 30% by mass or less,
a volume average particle diameter of the titanium oxide is 300 nm or greater but 630 nm or less, and
wherein the urethane resins comprise a (i) polycarbonate urethane resin having a glass transition temperature of lower than 25 degrees C. and a (ii) polyester urethane resin.