US 12,240,984 B2
Process for preparing an aqueous gel ink with fixed color comprising silver or gold nanoparticles
Olivier Albenge, Clichy (FR); Romain Metillon, Clichy (FR); Karine Mougin, Paris (FR); Feriel Ghellal, Clichy (FR); and Arnaud Spangenberg, Mulhouse (FR)
Assigned to SOCIETE BIC, Clichy (FR); UNIVERSITÉ DE HAUTE-ALSACE, Mulhouse (FR); and CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR)
Appl. No. 17/632,135
Filed by SOCIETE BIC, Clichy (FR); UNIVERSITE DE HAUTE ALSACE, Mulhouse (FR); and CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR)
PCT Filed Aug. 28, 2020, PCT No. PCT/EP2020/074119
§ 371(c)(1), (2) Date Feb. 1, 2022,
PCT Pub. No. WO2021/038066, PCT Pub. Date Mar. 4, 2021.
Claims priority of application No. 19306055 (EP), filed on Aug. 29, 2019.
Prior Publication US 2022/0275229 A1, Sep. 1, 2022
Int. Cl. C09D 11/17 (2014.01); B22F 9/24 (2006.01); B82Y 30/00 (2011.01); B82Y 40/00 (2011.01); C07C 69/618 (2006.01); C08K 3/08 (2006.01)
CPC C09D 11/17 (2013.01) [B22F 9/24 (2013.01); C07C 69/618 (2013.01); B82Y 30/00 (2013.01); B82Y 40/00 (2013.01); C08K 2003/0806 (2013.01); C08K 2003/0831 (2013.01)] 19 Claims
 
1. A process for preparing an aqueous gel ink with fixed color comprising the steps of:
(i) preparing a gel-based matrix of aqueous ink;
(ii) preparing an aqueous suspension of gold or silver nanoparticles with fixed color by mixing gold or silver salts with:
water,
a derivative of alkaline earth metal,
an ester of retinol of formula (I):

OG Complex Work Unit Chemistry
wherein R is an optionally substituted C1-C6 aliphatic group, and
optionally, a carbonate;
(iii) adding under stirring the aqueous suspension of gold or silver nanoparticles obtained in step (ii) to the gel-based matrix of aqueous ink obtained in step (i), thereby obtaining an aqueous gel ink with fixed color with gold or silver nanoparticles dispersed therein.