US 12,473,447 B2
Inkjet ink and inkjet recording method
Tatsuhiko Yoshii, Osaka (JP)
Assigned to KYOCERA Document Solutions Inc., Osaka (JP)
Filed by KYOCERA Document Solutions Inc., Osaka (JP)
Filed on Oct. 20, 2022, as Appl. No. 18/048,330.
Claims priority of application No. 2021-172493 (JP), filed on Oct. 21, 2021.
Prior Publication US 2023/0129764 A1, Apr. 27, 2023
Int. Cl. C09D 11/326 (2014.01); B41M 5/00 (2006.01); C09D 11/322 (2014.01); C09D 11/38 (2014.01)
CPC C09D 11/326 (2013.01) [B41M 5/0047 (2013.01); C09D 11/322 (2013.01); C09D 11/38 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An inkjet ink that has
a volume reduction rate ΔV calculated using formula (1) of at least 25% and no greater than 45%:
ΔV=100×(V0−V22)/V0  (1)
where in the formula (1), V0 represents a first volume of a liquid droplet of the inkjet ink at landing, on a non-absorbent recording medium, of the inkjet ink dropped onto the non-absorbent recording medium, and V22 represents a second volume of the liquid droplet when 22 seconds elapse from the landing of the liquid droplet on the non-absorbent recording medium, and
the volume reduction rate ΔV of the ink is measured in a sealed environment with no wind at a temperature of 25° C. and a relative humidity of 50% under an air pressure (760 mmHg) using a contact angle measuring device equipped with a syringe.