Writable and printable colloidal gold solution
AssigneeNanogate Coating Systems GmbH
InventorsMichael Berkei, Maren Korsten, Fernando Ibarra, Stephan Haubold
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Abstract
The present invention relates to an aqueous colloidal gold solution, comprising (a) nano-particular gold particles, (b) a compound having a polar tertiary amino group conjugated via a hydrophobic aromatic residue with a weaker alkaline group, and (c) a stabilizer comprising a mercapto group (—SH) and an acidic group, in particular a sulfonic acid group (—SO3−). This gold solution uses an ecologically compatible medium and is suited in an especial manner or writing and for printing, also for inkjet printers, since it has a long-term storage life and generates an attractive metal-like gold sheen.
Claims5
1-14. (canceled)
A gold-coated or impregnated substrate obtainable by application of an aqueous colloidal gold solution onto a substrate or by impregnation of the substance and evaporation of the aqueous medium, said aqueous colloidal gold solution comprising an aqueous medium and (a) gold particles in colloidal form, (b) a compound having a polar tertiary amino group conjugated via a hydrophobic aromatic residue with a weaker alkaline group which can also be part of the aromatic residue, and (c) a stabilizer comprising a mercapto group (—SH) and an acidic group.
Dependencies are inferred from the claim text.