Antimicrobial currency, material and method
View Patent ↗A material for use in currency comprises an antimicrobial polymer material which can be used in the manufacture of banknotes having security features therein. The material can be a sheet or substrate and/or an acrylate polymer coat applied to at least one surface of a banknote.
1. A currency, comprising:
a planar material having at least a first surface;
a first antimicrobial agent disposed in a polymer comprising the planar material;
an acrylate polymeric coating affixed to the at least first surface of the planar material; and
a second antimicrobial agent disposed in the acrylate polymeric coating affixed to the at least first surface of the planar material; and
wherein the first antimicrobial agent is different from the second antimicrobial agent.
2. The currency according to claim 1 wherein the first antimicrobial agent is an inorganic antimicrobial agent.
3. The currency of claim 2 wherein the first antimicrobial agent is one of silver zeolite; silver in amorphous glass; silver sol/gel; copper zeolite;
copper in amorphous glass; copper sol/gel; zinc zeolite; zinc in amorphous glass; or
zinc sol/gel.
4. The currency of claim 2 wherein the first antimicrobial agent is one of zinc pyrithione; sodium pyrithione; photocatalytic titanium dioxide; or barium metaborate monohydrate.
5. The currency according to claim 1 wherein the first antimicrobial agent is an organic antimicrobial agent.
6. The currency of claim 5 wherein the first antimicrobial agent is one of 2,4,4′-trichloro-2′-hydroxydiphenyl ether; diiodomethyl p-tolylsulfone; an azole such as propiconazole; polyhexamethylene biguanide hydrochloride; or 3,4,4′-trichlorocarbanilide.
7. The currency of claim 5 wherein the first antimicrobial agent is an isothiazolone-based compound such as 1,2-benzisothiazolin-3-one, N-butyl-1,2-benzisothiazolin-3-one, 2-octyl-isothiazolone, 4,5-dichloro-2-N-octyl-3(2H)-isothiazolone, methyl-3(2H)-isothiazolone, or chloro-2-methyl-3(2H)-isothiazolone.
8. The currency of claim 1 wherein the first antimicrobial agent has a concentration in the range of from about 500 ppm to about 20,000 ppm.
9. The currency of claim 1 wherein the first antimicrobial agent has a concentration in the range of from about 500 ppm to about 10,000 ppm and the second antimicrobial agent has a concentration in the range of from about 500 ppm to about 10,000 ppm.
10. A method for manufacturing a currency, comprising:
providing a planar material at least partly composed of a polymer and having at least a first surface, the polymer having a first antimicrobial agent disposed therein;
applying an acrylate coating composition to the at least first surface of the planar material, the acrylate coating composition containing a second antimicrobial agent; and
polymerizing the acrylate coating composition to form an acrylate coating layer on the at least first surface of the planar material
wherein the first antimicrobial agent is different from the second antimicrobial agent.
11. The method of claim 10 wherein the first antimicrobial agent is an inorganic antimicrobial agent.
12. The method of claim 11 wherein the first antimicrobial agent is one of silver zeolite; silver in amorphous glass; silver sol/gel; copper zeolite; copper in amorphous glass; copper sol/gel; zinc zeolite; zinc in amorphous glass; or zinc sol/gel.
13. The method of claim 11 wherein the first antimicrobial agent is one of zinc pyrithione; sodium pyrithione; photocatalytic titanium dioxide; or barium metaborate monohydrate.
14. The method of claim 10 wherein the first antimicrobial agent is an organic antimicrobial agent.
15. The currency of claim 14 wherein the first antimicrobial agent is one of 2,4,4′-trichloro-2′-hydroxydiphenyl ether; diiodomethyl p-tolylsulfone; an azole such as propiconazole; polyhexamethylene biguanide hydrochloride; or 3,4,4′-trichlorocarbanilide.
16. The currency of claim 14 wherein the first antimicrobial agent is an isothiazolone-based compound such as 1,2-benzisothiazolin-3-one, N-butyl-1,2-benzisothiazolin-3-one, 2-octyl-isothiazolone, 4,5-dichloro-2-N-octyl-3(2H)-isothiazolone, methyl-3(2H)-isothiazolone, or chloro-2-methyl-3(2H)-isothiazolone.
17. The currency of claim 10 wherein the first antimicrobial agent has a concentration in the range of from about 500 ppm to about 20,000 ppm.