US 12,221,549 B2
Set of inkjet inks, inkjet image forming method, and inkjet image forming apparatus
Hiroshi Gotou, Kanagawa (JP); Toshiyuki Kobashi, Tokyo (JP); Daisuke Ozaki, Kanagawa (JP); and Juichi Furukawa, Kanagawa (JP)
Assigned to Ricoh Company, Ltd., Tokyo (JP)
Filed by Hiroshi Gotou, Kanagawa (JP); Toshiyuki Kobashi, Tokyo (JP); Daisuke Ozaki, Kanagawa (JP); and Juichi Furukawa, Kanagawa (JP)
Filed on Oct. 27, 2022, as Appl. No. 18/050,343.
Claims priority of application No. 2021-177238 (JP), filed on Oct. 29, 2021.
Prior Publication US 2023/0132661 A1, May 4, 2023
Int. Cl. C09D 11/54 (2014.01); C09D 11/08 (2006.01); C09D 11/107 (2014.01); C09D 11/322 (2014.01); C09D 11/38 (2014.01); C09D 11/40 (2014.01); D06P 5/30 (2006.01)
CPC C09D 11/40 (2013.01) [C09D 11/08 (2013.01); C09D 11/107 (2013.01); C09D 11/322 (2013.01); C09D 11/38 (2013.01); C09D 11/54 (2013.01); D06P 5/30 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A set of inkjet inks used for forming an image by application of an ink on a cloth, the set comprising:
an ink; and
a pre-processing fluid,
wherein the pre-processing fluid contains water, a compound that flocculates an anionic compound, and at least one emulsified sizing agent,
wherein the at least one emulsified sizing agent is a rosin-based sizing agent or a compound represented by General formula (I) below

OG Complex Work Unit Chemistry
wherein in General formula (I), R1 and R2 each independently represent an alkyl group containing from 12 through 22 carbon atoms,
wherein a content of the at least one emulsified sizing agent in the pre-processing fluid expressed as a content of the sizing agent having a solid form, is 0.5% by mass or greater and 5% by mass or less.
 
8. An inkjet image forming method, for forming an image on a cloth using a set of inkjet inks including an ink and a pre-processing fluid, the inkjet image forming method comprising:
applying the pre-processing fluid to at least a region, on which an image is to be formed, of a cloth, and
inkjet-applying the ink to the region, to which the pre-processing fluid is applied, of the cloth obtained by the applying the pre-processing fluid,
wherein the pre-processing fluid contains water, a compound that flocculates an anionic compound, and at least one emulsified sizing agent,
wherein the at least one emulsified sizing agent is a rosin-based sizing agent or a compound represented by General formula (I) below,

OG Complex Work Unit Chemistry
wherein in General formula (I), R1 and R2 each independently represent an alkyl group containing from 12 through 22 carbon atoms,
wherein a content of the at least one emulsified sizing agent in the pre-processing fluid, expressed as a content of the sizing agent having a solid form, is 0.5% by mass or greater and 5% by mass or less.
 
12. An inkjet image forming apparatus, comprising:
a pre-processing fluid storage unit configured to store a pre-processing fluid;
an ink storage unit configured to store an ink;
a pre-processing fluid applying unit configured to apply the pre-processing fluid to at least a region, on which an image is to be formed, of a cloth; and
an ink applying unit configured to inkjet-apply the ink to the region, to which the pre-processing fluid is applied, of the cloth,
wherein the pre-processing fluid contains water, a compound that flocculates an anionic compound, and at least one emulsified sizing agent,
wherein the at least one emulsified sizing agent is a rosin-based sizing agent or a compound represented by General formula (I) below,

OG Complex Work Unit Chemistry
wherein in General formula (I), R1 and R2 each independently represent an alkyl group containing from 12 through 22 carbon atoms,
wherein a content of the at least one emulsified sizing agent in the pre-processing fluid expressed as a content of the sizing agent having a solid form, is 0.5% by mass or greater and 5% by mass or less.