US 12,215,238 B2
Clear ink, printing method, and inkjet printing apparatus
Hiroaki Takahashi, Kanagawa (JP); Kiminori Masuda, Tokyo (JP); and Mayumi Yoshihara, Kanagawa (JP)
Assigned to Ricoh Company, Ltd., Tokyo (JP)
Filed by Hiroaki Takahashi, Kanagawa (JP); Kiminori Masuda, Tokyo (JP); and Mayumi Yoshihara, Kanagawa (JP)
Filed on Apr. 8, 2022, as Appl. No. 17/715,957.
Claims priority of application No. 2021-081497 (JP), filed on May 13, 2021.
Prior Publication US 2022/0363927 A1, Nov. 17, 2022
Int. Cl. C09D 11/30 (2014.01); B41J 2/21 (2006.01); B41M 5/00 (2006.01); C09D 11/033 (2014.01); C09D 11/102 (2014.01); C09D 11/54 (2014.01)
CPC C09D 11/30 (2013.01) [B41J 2/2114 (2013.01); B41M 5/0023 (2013.01); C09D 11/033 (2013.01); C09D 11/102 (2013.01); C09D 11/54 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A clear ink, comprising:
resin particles having a volume average particle diameter of 50 nm or less;
water; and
a compound represented by General Formula (1) below:

OG Complex Work Unit Chemistry
where in the General Formula (1), R1 represents an alkyl group having 1 or more but 4 or less carbon atoms,
wherein a dried film of the clear ink has glass transition temperatures at 50 degrees Celsius or higher and at lower than 0 degrees Celsius.