US 11,807,762 B2
Process for preparing aqueous gel inks with variable 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 (C.N.R.S.), Paris (FR)
Appl. No. 17/296,176
Filed by SOCIETE BIC, Clichy (FR); UNIVERSITE DE HAUTE ALSACE, Mulhouse (FR); and CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (C.N.R.S.), Paris (FR)
PCT Filed Nov. 18, 2019, PCT No. PCT/EP2019/081573
§ 371(c)(1), (2) Date May 21, 2021,
PCT Pub. No. WO2020/104345, PCT Pub. Date May 28, 2020.
Claims priority of application No. 18306552 (EP), filed on Nov. 22, 2018.
Prior Publication US 2022/0041876 A1, Feb. 10, 2022
Int. Cl. C09D 11/17 (2014.01); C09D 11/16 (2014.01); C09D 11/02 (2014.01)
CPC C09D 11/17 (2013.01) [C09D 11/02 (2013.01); C09D 11/16 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A process for preparing in situ an aqueous gel ink with variable color comprising the following steps:
(i) preparing a gel-based matrix of aqueous ink comprising a reducing agent,
(ii) adding a solution of metallic salts,
(iii) adding iron powder to obtain an aqueous gel ink with variable color,
wherein the steps (ii) and (iii) can be interchanged.