Invented by Jeffery Richard Seidling, Helen Kathleen Moen, Scott W. Wenzel, Kimberly Clark Worldwide Inc
The Kimberly Clark Worldwide Inc invention works as followsWiping products such as facial tissues contain a temperature-change composition that can produce a cooling sensation when it comes in contact with skin. Structured emulsions may contain a phase-change material, carrier, surfactant and a crystal initiator. In one embodiment, the phase change materials can have a high heat of fusion. The temperature change composition absorbs heat, resulting in a cooling sensation or feeling to the skin.
Background for Temperature-changing compositions and tissue products that provide a cooling sensation
Numerous cosmetic and healthcare products can be applied to the skin to offer a variety of benefits. These products include creams, lotions, moisturizers and the like. The products may be intended to cool the skin or provide a cooling sensation after application. Skin cooling is often achieved by using skin cooling agents in combination with other substances.
There are many ways to cool the skin. These include evaporation and neurosensory components as well as thermodynamic agents like phase change materials. Menthol is an example of a cooling agent. It provides cooling through a physiological or neurological effect on nerve endings that sense temperature. The cooling sensation caused by menthol’s cooling effect is not due to heat from evaporation, but rather direct stimulation of the cold receptors at nerve endings.
The use phase change materials to impart cooling are discussed, for example, in PCT International Publication No. This reference is taken from WO 2006/007564 entitled “Cosmetic Compositions & Methods for Sensory cooling?”. A skincare cosmetic composition described in the ‘564 patent is a lotion intended to be used in after-sun and after-shave products as well as body moisturizing products. By incorporating components that absorb heat from skin, the lotion will create a cooling sensation. The lotion contains ingredients that melt and absorb heat. These components have a high heat offusion, which is defined as heat absorbed per unit of mass of a chemical element at its melting temperature to transform the solid into liquid at the same temperature. According to the ‘564 Application, the high heat offusion aids in the absorption heat from the skin which helps to melt the solid ingredient when it is applied to the skin. This cools the skin temperature.
PCT Patent Application No. PCT/IB2009/051515, entitled “Tissue Products with a Cooling Effect when Contacted With Skin?”. In the ‘515 patent, a phase-change agent is used between layers of dry tissue web. A separate hydrophobic lotion layer is placed on the outside surfaces of the tissue product. This provides a cooling sensation. This is problematic because components of the hydrophobic cream can get into the hydrophobic phase-change agent, causing it to become unstable in its ability to cool. Alternately, the phase-change agent could migrate to the tissue’s exterior and cause skin irritation.
There is a need for a way to hold a phase-change agent on or within a substrate such as tissue. This will allow the skin to cool without irritation. A substrate is also needed, such as a tissue that contains the composition. This will allow the composition to be delivered to the nasal area to soothe, moisturize and cool irritated nostrils. The substrate will hold the phase change agent, keeping it out of the skin.
Generally, dry wiping products, and especially dry substrates, that when held against skin can provide a cooling feeling are disclosed. One embodiment may include facial tissue as the substrate. A facial tissue can be used for comforting a user’s nasal passages. A person can get irritated and irritated by the common cold. One embodiment discloses a tissue product that can be used to clean the nose and also provides comfort and relief by cooling the nose.
The structured emulsion may be made with the temperature-change composition. It can be any of a variety of structured emulsions, including an alpha-phase, discontinuous cubic (micellar cube) emulsion or a hexagonal phase. The structured emulsion should be a d phase emulsion.
The amount of phase change agent that is incorporated into the temperature-change composition will vary depending on the application and desired results. For example, the phase change agent could be oil-soluble or hydrophobic. Some examples of phase change agents are hydrocarbons and waxes, oils and natural butters. One embodiment allows for the incorporation of multiple phase change agents into the temperature-change composition. The following are examples of phase-change agents that are well-suited for the present disclosure: tricaprin (nonadecane), stearyl alcohol, lauryl lactate and lauryl alcohol; capric acid, caprylic acids, caprylic acids, cetyl babassuate; mangifera Indica (mango) seeds butter; theobroma cacao seed butter; butyrospermum parksii butter; Di-C12-15 alkyl fumarate, stearamidopropyl-dimonium phosphate phosphate stearamidopropyl-dimonium chloride phosphate phosphate jojoba, jojoba hexadecane aceryl eryl dimonium chloride phosphate stearyl-dimine containing ole, stearyl, stearyl, adecane-dimonium dimine, stearyl
The phase-change component can be found in an amount of about 1% by mass of the thermo change composition or about 99.9% of the temp change composition. It is more desirable to have about 20% by the weight temperature change and about 90% of the climate change composition. And even more desirable, between about 50% and 80% by the weight temperature change and the temperature composition.
In an exemplary embodiment, it is possible to select the crystalline initiator from fatty alcohols or fatty acids, esters and sugars, as well as crystalline and microcrystalline waxes and microcrystalline triglycerides and combinations thereof.
Generally, the crystal initiator can be found in an amount between 0.1% and 30% by weight temperature change mixture, more desirable from about 1% to about 25% by mass temperature change component, and even more desirable from about 2% to about 20% by mass temperature change combination.
The temperature change composition includes a carrier.” The carrier can be water, glycerin or diglycerin derivatives and glycols as well as sugars and ethoxylated/or propoxylated esters, ethers and ethers, sodium PCA and alcohols.
Typically, temperature change components may contain a carrier in an amounts from about 1 g of the temperature composition to around 40% by weight. More often, it is from approximately 2% to 25% by weight.
The temperature change composition also includes a surfactant. You can choose from anionic, cationic, amphoteric, zwitterionic, non-ionic, or combinations of these surfactants to be suitable additional surfactants. There are many types of surfactants that can be used in personal care products and tissues. A temperature composition can contain one or more surfactants. This ranges from 0.5% to 15% by mass of the thermo change composition. It is more desirable to have about 1% to 15% of the temperature composition and, even more, from about 2% to about 7% of the temp change composition.
The dry substrate could be made of at least one web of fibers such as pulp fibers or synthetic fibers combined. It is possible that the temperature change composition of the web may be present on at most one side.
Another feature and aspect of the present disclosure is discussed in more detail below.
It is to understand by one of ordinary skill, in the art that this discussion is a description only of exemplary embodiments and is not meant as limiting the wider aspects of the present invention.
Dry, which is used herein to refer tissue or wiping products means that the product has been supplied without moisture beyond what is normally associated with it. What is the ‘equilibrium humidity? The sheet’s moisture content when it is exposed to the air for prolonged periods of time. At the same temperature and relative humidity, the equilibrium moisture in the sheet will not change over time. Dry products will typically have an equilibrium moisture content of 15% or less, and less than 10% for dry products. This is due to the fact that they are subject to a wide range of ambient conditions.
The heat absorb factor, as defined herein, is the product of heat of fusion of cooling composition expressed as J/gram and cooling composition application rate to tissue product expressed as gsm.Click here to view the patent on Google Patents.