Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Wearing apparel – fabric – or cloth
Reexamination Certificate
2000-05-01
2001-10-23
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Wearing apparel, fabric, or cloth
C424S010100, C424S400000, C424S402000, C424S443000, C424S447000, C424S448000, C424S077000
Reexamination Certificate
active
06306412
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns cosmetic dermal strips or patches which provide consumers with a temperature change as a sensorial signal.
2. The Related Art
Cosmetics are often provided with consumer perceivable sensorial signals. Most common of these signals are fragrances. Pleasing odor is often the single most important attribute inducing re-purchase by a consumer. Other sensorial attributes are also significant in cosmetic chemistry. Skinfeel of a product is highly important. Creams, lotions, gels and pastes often are judged for their efficacy by the tacticity of their feel. Silky, non-residue leaving cosmetics are much preferred over tacky ones, and the consumer may relate those aesthetics to actual pharmacological performance.
Sometimes the sensorial attribute is that of temperature. Coolness is imparted to toothpastes and aftershave lotions through the presence of camphor, menthol or menthol derivatives such as menthol lactate. Some formulations signal efficacy through a temperature increase. Inclusion of capsaicin, an alkaloid extracted from capsicum, gives a brief temperature rise sensation to the human neural system. Temperature sensations of the known art are relatively short lived. Mechanisms are necessary to extend the sensation.
Dermal patches or strips have recently become popular as delivery vehicle systems for cosmetic compositions. For instance, WO 98/42303 (Crotty et al.) describes a dry-to-the-touch keratotic plug remover strip. Upon wetting, the strip turns tacky and mobile. This product is placed on the bridge of the nose or other areas of the face requiring keratotic plug removal. Within a short time period, water evaporates from the wetted adhesive forming a dry film. The consumer must then peel the film from the face along with unwanted plugs bonded thereto. Amounts of water applied by the consumer may vary. Drying times are therefore also variable. A sensorial signal would be helpful for the consumer to know when to begin the peel removal.
Exothermic and endothermic reactions are other sources of temperature signaling. U.S. Pat. No. 5,861,440 (Gohla et al.) reports use of sugars, especially xylitol, for inducing a cooling sensation when contacted with water. Generation of exothermic heat is reported in U.S. Pat. No. 4,379,143 (Sherry et al.), U.S. Pat. No. 4,626,550 (Hertzenberg), U.S. Pat. No. 4,362,715 (Strianse et al.) and U.S. Pat. No. 3,250,680 (Menkart et al.). Each of these patents employ an aluminosilicate interacting with water to release momentary heat.
It is an object of the present invention is to provide cosmetic products, especially dermal strips or patches with an improved temperature sensorial signal.
Another object of the present invention is to provide cosmetic products, especially dermal strips or patches imparting a temperature change as a sensorial signal which may augment other sensory or emotive aesthetics of such products.
These and other objects of the present invention will become more readily apparent from consideration of the following summary and detailed discussion.
SUMMARY OF THE INVENTION
An adhesive cosmetic strip is provided for placement on skin which includes:
(i) a flexible water-insoluble substrate;
(ii) an adhesive composition deposited onto the substrate; and
(iii) an agent interactive with water present in a sufficient quantity to induce a change of temperature in the strip of at least about 2° C.
DETAILED DESCRIPTION OF THE INVENTION
Now a temperature change sensorial signal has been found for use with dermal strips or patches. The invention is based upon the use of agents interactive with water that can be held for long periods of time close to the skin by incorporation into the adhesive portion of a strip or between layers of the strip. Water can be introduced to the area of treatment just prior to applying the patch. Alternatively the inherent moisture and sweat found on surfaces of the skin can serve to activate the agent thereby inducing a heat or cooling effect.
Flexible water-insoluble substrates are an essential element of the present invention. By “water insoluble” is meant that the substrate does not dissolve in or readily break apart upon immersion in water. A wide variety of materials can be used as the substrate.
Nonlimiting examples of suitable substrates include nonwoven substrates, woven substrates, hydroentangled substrates, air entangled substrates and the like. Preferred embodiments employ nonwoven substrates since they are economical and readily available in a variety of materials. By nonwoven is meant that the layer is comprised of fibers which are not woven into a fabric but rather are formed into a sheet, particularly a tissue. The fibers can either be random (i.e., randomly aligned) or they can be carded (i.e. combed to be oriented in primarily one direction). Furthermore, the nonwoven substrate can be composed of a combination of layers of random and carded fibers.
Nonwoven substrates may be comprised of a variety of materials both natural and synthetic. By natural is meant that the materials are derived from plants, animals, insects or byproducts. By synthetic is meant that the materials are obtained primarily from various man-made materials or from material that is usually a fibrous web comprising any of the common synthetic or natural textile-length fibers, or mixtures thereof.
Nonlimiting examples of natural materials useful in the present invention are silk fibers, keratin fibers and cellulosic fibers. Nonlimiting examples of keratin fibers include those selected from the group consisting of wool fibers, camel hair fibers, and the like. Nonlimiting examples of cellulosic fibers include those selected from the group consisting of wood pulp fibers, cotton fibers, hemp fibers, jute fibers, flax fibers, and mixtures thereof. Wood pulp fibers are preferred.
Nonlimiting examples of synthetic materials useful in the present invention include those selected from the group consisting of acetate fibers, acrylic fibers, cellulose ester fibers, modacrylic fibers, polyamide fibers, polyester fibers, polyolefin fibers, polyvinyl alcohol fibers, rayon fibers and mixtures thereof. Examples of some of these synthetic materials include acrylics such as Acrilan®, Creslan®, and the acrylonitrile-based fiber, Orion®; cellulose ester fibers such as cellulose acetate, Arnel®, and Acele®; polyamides such as Nylons (e.g., Nylon 6, Nylon 66, Nylon 610 and the like); polyesters such as Fortrel®, Kodel®, and the polyethylene terephthalate fibers, Dacron®; polyolefins such as polypropylene, polyethylene; polyvinyl acetate fibers and mixtures thereof.
Nonwoven substrates made from natural materials consist of webs or sheets most commonly formed on a fine wire screen from a liquid suspension of the fibers.
Nonwoven substrates made from synthetic materials useful in the present invention can be obtained from a wide variety of commercial sources. Nonlimiting examples of suitable nonwoven layer materials useful herein include HEF 40-047, an apertured hydroentangled material containing about 50% rayon and 50% polyester, and having a basis weight of about 43 grams per square yard (gsy), available from Veratec, Inc., Walpole, Mass.; HEF 140-102, an apertured hydroentangled material containing about 50% rayon and 50% polyester, and having a basis weight of about 56 gsy, available from Veratec, Inc., Walpole, Mass.; Novenet® 149-191, a thermo-bonded grid patterned material containing about 69% rayon, about 25% polypropylene, and about 6% cotton, and having a basis weight of about 100 gsy, available from Veratec, Inc., Walpole, Mass.; HEF Nubtex® 149-801, a nubbed, apertured hydroentangled material, containing about 100% polyester, and having a basis weight of about 70 gsy, available from Veratec, Inc. Walpole, Mass.; Keybak® 951V, a dry formed apertured material, containing about 75% rayon, about 25% acrylic fibers, and having a basis weight of about 43 gsy, available from Chicopee Corporation, New Brunswick, N.J.; Keybak® 1368, an apertured material, containing about 75%
Crotty Brian Andrew
Slavtcheff Craig Stephen
Znaiden Alexander Paul
Evans Charesse L.
Honig Milton L.
Page Thurman K.
Unilever Home & Personal Care USA , division of Conopco, Inc.
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