Cooling substrates with hydrophilic containment layer and method of making
View Patent ↗Wiping products, such as facial tissues, contain an interior temperature change composition and an exterior hydrophilic lotion composition that can provide a cooling sensation when contacted with the skin of a user. The temperature change composition, for instance, can contain one or more phase change agents that undergo a phase change at slightly elevated temperatures. The phase change agents, in one embodiment, can have a relatively high heat of fusion. When undergoing a phase change, the phase change agents absorb heat and thereby provide a cooling feeling to the skin of a user. The hydrophilic lotion composition may contain a carrier and a thermo-reversible gelling agent. The hydrophilic lotion composition maintains the temperature change composition within the tissue and helps to prevent skin irritation.
1. A dry substrate comprising:
a first web comprised of fibers and a second web comprised of fibers, the first web and the second web each having a basis weight of from about 5 to about 60 grams per square meter;
a temperature change composition located between the first web and the second web, the temperature change composition containing a phase change agent that undergoes a phase change at a temperature from about 20° C. to about 35° C., the phase change agent having a heat of fusion of at least about 100 J/g and being present on the dry substrate such that the dry substrate has a heat absorption factor of at least about 500 J/m 2 ; and
a hydrophilic lotion on an exterior surface of the dry substrate comprising a carrier present in an amount between about 1% by the weight of the hydrophilic lotion composition and about 99.9% by the weight of the hydrophilic lotion composition and a thermo-reversible gelling agent present in an amount between about 0.1% by the weight of the hydrophilic lotion composition and about 50% by the weight of the hydrophilic lotion composition.
2. The dry substrate of claim 1 wherein the phase change agent is oil soluble and hydrophobic.
3. The dry substrate of claim 1 wherein the phase change agent is selected from the group consisting of tricaprin, parrafin, nonadecane, octadecane, stearyl heptanoate, lauryl lactate, lauryl alcohol, capric acid, cetyl babassuate, dipropylene glycol isoceteth-20 acetate, PEG-12, bis-PEG-15 methyl ether dimethicone, butyrospermum parkii butter, Di-C 12-15 alkyl fumarate, stearyl caprylate, cetyl lactate, cetyl acetate, C 24-28 alkyl methicone, glyceryl dilaurate, coceth-10, stearamidopropyl PG-dimonium chloride phosphate, cetyl alcohol, jojoba esters, and combinations thereof.
4. The dry substrate of claim 1 wherein the phase change agent has a heat of fusion of at least about 100 J/g.
5. The dry substrate of claim 1 wherein the carrier is selected from the group consisting of water, glycerin, diglycerin, glycerin derivatives, glycols, glycol derivatives, sugars, ethoxylated and/or propoxylated esters and ethers, urea, sodium PCA, alcohols, ethanol, isopropyl alcohol, and combinations thereof.
6. The dry substrate as defined in claim 1 wherein the thermo-reversing gelling agent is selected from the group consisting of polyethylene glycols and derivatives thereof, PEG-150 pentaerythrityl tetrastearate, disteareth-75 IPDI, disteareth-100 IPDI, fatty alcohols, fatty acids, salts of fatty acids, and combinations thereof.
7. The dry substrate as defined in claim 1 , wherein the temperature change composition is present on the web in an amount from about 4 gsm to about 40 gsm.
8. The dry substrate as defined in claim 1 , wherein the substrate further comprises a third web, the third web having a basis weight of from about 5 to about 60 grams per square meter.
9. The dry substrate as defined in claim 1 , wherein the phase change agent comprises a hydrocarbon, a wax, an oil, a fatty acid, a fatty acid ester, a dibasic acid, a dibasic ester, a 1-halide, a primary alcohol, an aromatic compound, an anhydride, an ethylene carbonate, a polyhydric alcohol, or mixtures thereof.
10. The dry substrate as defined in claim 1 , wherein the substrate comprises a facial tissue.
11. The dry substrate of claim 1 , wherein the first web comprises two plies and wherein the second web comprises two plies.