US 12,202,988 B2
Process for preparing aqueous gel inks with fixed color, and aqueous gel inks thereof
Karine Mougin, Valdieu-Lutran (FR); Feriel Ghellal, Belfort (FR); Arnaud Spangenberg, Flaxlanden (FR); Romain Metillon, Combs la Ville (FR); and Olivier Albenge, Mortcerf (FR)
Assigned to SOCIETE BIC, Clichy (FR); UNIVERSITE DE HAUTE ALSACE, Mulhouse (FR); and CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR)
Appl. No. 17/296,201
Filed by SOCIETE BIC, Clichy (FR); UNIVERSITE DE HAUTE ALSACE, Mulhouse (FR); and CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR)
PCT Filed Nov. 18, 2019, PCT No. PCT/EP2019/081633
§ 371(c)(1), (2) Date May 21, 2021,
PCT Pub. No. WO2020/104367, PCT Pub. Date May 28, 2020.
Claims priority of application No. 18306553 (EP), filed on Nov. 22, 2018.
Prior Publication US 2022/0010153 A1, Jan. 13, 2022
Int. Cl. C09D 11/17 (2014.01); B41J 2/21 (2006.01); B82Y 40/00 (2011.01); C09D 11/30 (2014.01); C09D 11/32 (2014.01); C09D 11/328 (2014.01)
CPC C09D 11/17 (2013.01) [B41J 2/2107 (2013.01); C09D 11/30 (2013.01); C09D 11/32 (2013.01); C09D 11/328 (2013.01); B82Y 40/00 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A process for preparing in situ an aqueous gel ink with fixed color comprising the following steps:
(i) preparing a gel-based matrix of aqueous ink comprising 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid as a reducing agent, and
(ii) adding a solution of metallic salts to the gel-based matrix of aqueous ink prepared in step (i), to obtain an aqueous gel ink with fixed color with metallic nanoparticles dispersed therein,
wherein the process is free of addition of a dye or pigment other than metallic nanoparticles.