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US 12,240,984 B2Granted
Process for preparing an aqueous gel ink with fixed color comprising silver or gold nanoparticles
AssigneesSociete BIC, Universite De Haute Alsace, Centre National De La Recherche Scientifique
InventorsOlivier Albenge, Romain Metillon, Karine Mougin, Feriel Ghellal, Arnaud Spangenberg
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Abstract
The invention relates a process for preparing an aqueous gel ink with fixed color comprising the following steps: (i) preparing a gel-based matrix of aqueous ink; (ii) preparing an aqueous suspension of gold or silver nanoparticles with a fixed color; (iii) adding the aqueous suspension of gold or silver nanoparticles obtained in step (ii) to the gel-based matrix of aqueous ink obtained in step (i).
Claims19
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):
- 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.
5 more elements
Dependencies are inferred from the claim text.