Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1999-03-19
2004-01-27
Padmanabhan, Sreeni (Department: 1619)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S066000, C424S068000, C424S078030, C514S063000
Reexamination Certificate
active
06682749
ABSTRACT:
FIELD OF THE INVENTION
This invention is a continuation-in-part of U.S. Ser. No. 09/054,666, filed Apr. 3. 1998, and relates to an improved low residue cosmetic composition for use in underarm products such as antiperspirants and deodorants. The compositions of this invention use specific types of silicone elastomers and give improved properties.
BACKGROUND OF THE INVENTION
The present invention is directed to a cosmetic composition (especially a gelled composition) which leaves little or no visible (white) residue on the skin, and which has improved properties especially in the areas of glidability, skin feel, smoothness, reduction in tack, reduction in syneresis, and increased efficacy. In particular, the present invention may be used to formulate cosmetic compositions which contain at least one cosmetically active material (for example, a member selected from the group comprising antiperspirant active materials, deodorant active materials, insect repellents, antifungal agents, antimicrobials (also called bacteriostats or antibacterials), and fragrances), which leaves little or no visible residue on the skin, and which has improved aesthetic properties as described above. A particular area of emphasis is underarm products such as antiperspirant and/or deodorant compositions which utilize an antiperspirant active and/or an antimicrobial.
There is a continuing trend to develop new and superior cosmetic compositions especially for the reduction and/or elimination of wetness and/or odor under the arms. Particular efforts include developing clearer and lower residue products as well as raising the performance and aesthetics of such products. Various product forms have included sticks (especially gel/sticks), gels, soft solids, roll-ons, aerosols and creams. Of these various forms the sticks, gels, soft solids creams and roll-ons are made with a liquid base material incorporating a solidifying agent and/or gelling agent and/or thickening agent. Generally, these forms include a solution of the cosmetically active ingredient in a suitable vehicle, a suspension of the active ingredient in a carrier vehicle, or a multiphasic dispersion or emulsion in which a solution of the active ingredient is dispersed or suspended in some continuous phase or in which the solubilized active ingredient constitutes the continuous phase.
A variety of soft-solid formulations are known. These include formulations made with the following ingredients:
(a) clay thickening agent and an activator for the clay: for example, U.S. Pat. No. 5,019,375 to Tanner et al; and U.S. Pat. No. 4,526,780 to Marschner et al;
(b) particulate thickening agents such as fumed silica: for example, U.S. Pat. No. 5,069,897 to Orr; and U.S. Pat. No. 4,937,069 to Shin;
(c) selected volatile and/or non-volatile alkylmethylsiloxanes such as those including a structuring wax: for example, U.S. Pat. No. 5,225,188 to Abrutyn et al; and PCT applications WO 97/16161 and 16162 both of which are assigned to Unilever PLC; and
(d) triglyceride gellants such as the glyceryl tribehenate described in U.S. Pat. No. 5,718,890 to Putnam et al.
An attempt to use silicone gel materials without the incorporation of clay or wax into the cosmetic formulations is described in PCT case WO 97/44010 and assigned to the same assignee as this application. One type of silicone gel material in this application is made by combining (a) a volatile silicone material and (b) an organopolysiloxane material (or silicone elastomer) as a gelling agent wherein the organopolysiloxane material (silicone elastomer) can be a reaction product of a vinyl-terminated siloxane polymer and a silicon hydride cross-linking agent. Related technology is also disclosed in PCT case WO 98/00097, WO 98/00104 and 98/00105 assigned to Unilever PLC on cross-linked non-emulsifying elastomers.
U.S. Pat. No. 5,599,533 to Stepniewski et al assigned to Estee Lauder describes a stable water-in-oil emulsion system formed with an organopolysiloxane elastomer, a vehicle in which the elastomer is dispersed or dispersible, a stabilizing agent, a surfactant and an aqueous component. A commercial product known as “REVELATION” retexturizing complex for hands and chest sold by the same assignee contains a silicone gel material with an organopolysiloxane component and octamethylcyclotetrasiloxane.
Other examples of discussion of elastomer type materials and/ or methods for processing such materials may be found in PCT cases WO 98/00097; WO 98/00104; WO 98/00105; WO 98/18438; WO 98/42307 all of which are incorporated herein by reference.
EP 0 787 758 A1 teaches a method for solvent thickening by using a silicone latex having a plurality of crosslinked polysiloxane particles.
PCT case WO 96/06594 assigned to Helene Curtis, Inc. describes a silicone-free surfactant or silicone-free surfactant blend having an HLB value of 0.1 to about 10, an organic phase comprising a volatile silicone compound or a volatile hydrocarbon compound, and water.
Borate cross-linkers useful in topically active compositions are described in EP 0 676 193 A2 to Helene Curtis, Inc.
These types of compositions are not totally satisfactory in cosmetic applications, especially underarm applications since they tend to synerese, form films, etc. Thus, there remains a need for improved formulations which exhibit improved properties and performance, especially in the area of aesthetics and efficacy.
In particular, one of the major problems with elastomer-containing formulations is the formation of a film after application to the surface of the skin. The hydrophobic nature of such a film may prevent an active ingredient (for example, an antiperspirant active) from reaching the targeted site (for example, when applied to the underarm area for antiperspirant/deodorant purposes).
Thus, it is an object of the present invention to provide cosmetic compositions which use selected silicone gel material to form compositions which leave little or no visible (white) residue on the skin, and which have improved properties especially in the areas of glidability, skin feel, smoothness, reduction in tack, reduced syneresis and increased efficacy.
It is another object of the invention to provide cosmetic compositions which reduce or eliminate the tendency to form films on the skin when applied in use, which might affect efficacy.
It is a further object of the invention to provide improved cosmetic compositions with the improvements as previously described and which are useful as antiperspirants and/or deodorants.
It is yet another object of this invention to provide cosmetic compositions which exhibit a reduction or elimination in the formation of films when applied to the skin surface.
It is still another object of the invention to provide underarm products containing an active ingredient which are made with a selected surfactant and which exhibit a reduction or elimination in the formation of films when applied to the skin surface with an increase in the efficacy of the antiperspirant active.
These and other objects of the invention will be apparent from the following description of the invention.
SUMMARY OF THE INVENTION
This invention comprises low residue cosmetic compositions (especially underarm products) which are made by combining an active ingredient; a silicone gel material itself comprising an elastomer composition; and at least one selected surfactant having an HLB value in the range of 8-16. The compositions of this invention exhibit reduced or eliminated film formation when applied to the skin and increased availability of the active ingredient.
DETAILED DESCRIPTION OF THE INVENTION
The cosmetic compositions of this invention can be made in the form of solids (for example, sticks (especially gel/sticks), gels, soft solids and creams) or liquids which have a viscosity of at least 1,000 centipoise (“cps”).
The compositions of the present invention are made by combining:
(a) an active cosmetic material selected from the group consisting of antiperspirant active materials, deodorant active materials, insect repellents, antifungal agents, antibacter
Guenin Eric P.
Lee Wilson
Linn Elizabeth
Mattai Jairajh
Potechin Kathy J.
Colgate-Palmolive Company
Miano Rosemary M.
Padmanabhan Sreeni
Wells Lauren Q.
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