Anti-microbial substrates with peroxide treatment
View Patent ↗An oxidizing anti-microbial treatment and products containing such treatment are described. The treatment involves, in part, preparing a substrate to accept an attachment of charged moieties, and a number of stabilized peroxide compounds on at least part of a surface of said substrate. When microbes, such as bacteria, having a net charge opposite to that of the charged moieties come in close proximity to the treated substrate surface, peroxide molecules from the substrate are activated and released to kill the microbes.
1. A tissue product comprising:
a stack of individual tissue sheets or a spirally wound roll of individual tissue sheets separated by a line of weakness, each tissue sheet having a first surface and a second and opposite surface, the tissue sheets having a bulk density of at least 3 cc/g, wherein the tissue sheets contain fibers impregnated with a cationic compound;
an anti-microbial composition applied to each tissue sheet, the anti-microbial composition comprising a substantially dehydrated peroxide complex, wherein the peroxide complex comprises hydrogen peroxide complexed with a polymer and is configured to release hydrogen peroxide when the tissue sheet is contacted with water; and
a softening agent applied to each tissue sheet, wherein the weight ratio of substantially dehydrated peroxide complex to the softening agent ranges from about 0.05 to about 5, wherein the softening agent comprises a polysiloxane, a fatty alkyl derivative, or a combination thereof.
2. A tissue product as defined in claim 1 , wherein the peroxide complex comprises a hydrogen peroxide-polyvinylpyrrolidone complex.
3. A tissue product as defined in claim 1 , wherein the softening agent is blended with the anti-microbial composition.
4. A tissue product as defined in claim 1 , wherein each tissue sheet comprises synthetic fibers.
5. A tissue product as defined in claim 1 , wherein each tissue sheet comprises synthetic and pulp fibers.
6. A tissue product as defined in claim 1 , wherein the anti-microbial composition is present at least on the first surface of each tissue sheet.
7. A tissue product as defined in claim 1 , wherein the tissue product comprises a facial tissue, a bath tissue, or a paper towel.
8. A tissue product as defined in claim 1 , wherein each tissue sheet comprises at least 70% by weight pulp fibers.
9. A tissue product as defined in claim 1 , wherein the peroxide complex comprises a complex of hydrogen peroxide with a copolymer of vinylpyrrolidone with an acrylic, a vinyl ester, a vinyl ether, an anhydride, an olefin or mixtures thereof.
10. A tissue product as defined in claim 1 , wherein the anti-microbial composition is present on each tissue sheet in an amount from about 0.1 percent to about 15 percent by weight.
11. A tissue product as defined in claim 1 , wherein the anti-microbial composition is present on each tissue sheet in an amount such that the tissue sheet contains from about 0.5 percent to about 5 percent by weight hydrogen peroxide.
12. A tissue product as defined in claim 1 , wherein the anti-microbial composition further comprises a thickening agent and an emulsifier.
13. A tissue product as defined in claim 1 , wherein the anti-microbial composition further comprises polyethylene glycol.
14. A tissue product as defined in claim 1 , wherein the tissue product comprises a wet wipe containing a wiping solution, the wiping solution being substantially water-free.
15. A tissue product as defined in claim 1 , wherein the peroxide complex comprises hydrogen peroxide complexed with a copolymer of polyvinylpyrrolidone and an acrylate.
16. A tissue product as defined in claim 15 , wherein the acrylate comprises octadecyl acrylate.
17. A tissue product as defined in claim 9 , wherein the vinylpyrrolidone copolymer carries a fatty group or a polysiloxane group.
18. A tissue product as defined in claim 1 , wherein the cationic compound is a quaternary ammonium compound.
19. A tissue product as defined in claim 1 , wherein the cationic compound is present in an amount from about 0.01% by weight of each tissue sheet to about 25% by weight of each tissue sheet.