Anti-microbial hand towel with time-delay chromatic transfer indicator and absorbency rate delay
View Patent ↗A disposable paper towel with an anti-microbial lotion and is provided with a chromatic transfer indicator which undergoes a delayed, visually perceptible color change at a predetermined time after the towel is wetted. An anti-microbial lotion on the towel increases water absorbency times (WAR) to further promote lotion transfer to the skin and increase lotion transfer effectiveness.
1. An anti-microbial paper towel comprising:
a) a cellulosic web;
b) a waterless micro-emulsion which is substantially liquid at room temperature immobilized on the web in a semi-solid or solid state and selected and applied in amounts such that it imparts a water absorption rate delay of at least about 25% to the cellulosic web;
c) wherein the waterless micro-emulsion comprises an anti-microbial agent, a polar emollient, a non-polar emollient and a surfactant composition including a nonionic surfactant; and wherein further the waterless micro-emulsion is capable of forming an aqueous micro-emulsion upon contact with water;
d) a water soluble pH balancing agent disposed on the web at a plurality of discrete pH balancing agent locations; and
e) a pH-sensitive transfer indicator disposed on the web at a plurality of discrete indicator locations which are apart from the pH balancing agent locations, wherein the pH-sensitive transfer indicator is chromatically responsive to the pH balancing agent in aqueous form; and
wherein further the pH balancing agent and the pH-sensitive transfer indicator are selected and applied to the web such that the pH-sensitive transfer indicator undergoes a gradual color change upon contact of the paper towel with water to indicate effective transfer of the waterless micro-emulsion, wherein the initiation of said color change is determined by the wicking time of the pH balancing agent.
2. The anti-microbial paper towel according to claim 1 , wherein waterless micro-emulsion comprises polar emollient in an amount of from about 2% to about 40% by weight of the lotion emulsion.
3. The anti-microbial paper towel according to claim 1 , wherein the waterless micro-emulsion comprises a polar polyhydroxy emollient selected from propylene glycol, glycol, glycerol, diethylene glycol, methylene glycol, polypropylene glycol, polyethylene glycol and sorbitol.
4. The anti-microbial paper towel according to claim 3 , wherein the polar emollient is propylene glycol.
5. The anti-microbial paper towel according to claim 1 , wherein the waterless micro-emulsion comprises non-polar emollient in the amount of from about 10% to about 40% by weight of the waterless micro-emulsion.
6. The anti-microbial paper towel according to claim 1 , wherein the waterless micro-emulsion comprises the non-polar emollient selected from aromatic or linear esters, Guerbet ester, mineral oil, squalane, liquid paraffin, and mixtures thereof.
7. The anti-microbial paper towel according to claim 6 , wherein the non-polar emollient is isopropyl myristate.
8. The anti-microbial paper towel according to claim 6 , wherein the non-polar emollient is C 12 -C 15 alkyl benzoate ester.
9. The anti-microbial paper towel according to claim 6 , wherein the non-polar emollient is tri-octyldodecyl-citrate.
10. The anti-microbial paper towel according to claim 6 , wherein the non-polar emollient is a mixture of C 12 -C 15 alkyl benzoate ester and carnation oil.
11. The anti-microbial paper towel according to claim 1 , wherein the surfactant composition comprises nonionic surfactant and a fatty alcohol, and the surfactant composition is present in the amount of from about 40% to about 70% by weight of the waterless micro-emulsion.
12. The anti-microbial paper towel according to claim 1 , wherein the surfactant composition comprises the non-ionic surfactant selected from PEG-20 methyl glucose sesquistearate, PPG-20 methyl glucose ether, PPG-20 methyl glucose ether distearate, PEG-20 methyl glucose distearate, PEG-120 methyl glucose dioleate, ethoxylated methyl glucose having from about 10 to about 20 repeating ethoxy units, a mixture thereof and the like.
13. The anti-microbial paper towel according to claim 12 , wherein the non-ionic surfactant comprises PEG-20 methyl glucose sesquistearate.
14. The anti-microbial paper towel according to claim 12 , wherein the non-ionic surfactant comprises PEG-20 methyl glucose distearate.
15. The anti-microbial paper towel according to claim 1 , wherein the surfactant composition comprises a co-surfactant in the amount of from about 0.1% to about 20% by weight of the waterless micro-emulsion.
16. The anti-microbial paper towel according to claim 15 , wherein the surfactant composition comprises the co-surfactant selected from C 12 -C 18 fatty alcohols, behenyl alcohol, cetyl alcohol, stearyl alcohol, iso-cetyl alcohol, and iso-stearyl alcohol.
17. The anti-microbial paper towel according to claim 15 , wherein the co-surfactant is myristyl alcohol.
18. The anti-microbial paper towel according to claim 15 , wherein the co-surfactant is a mixture of cetyl alcohol (C 16 ) and stearyl alcohol (C 18 ).