Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2000-04-06
2003-01-07
Hartley, Michael G. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S747000
Reexamination Certificate
active
06503517
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerts cosmetic compositions formulated with menthol and its derivatives.
2. The Related Art
Somatic sensation enables our bodies to feel, ache and react to temperature changes. The reactions occur when skin sensory receptors throughout the body are stimulated by mechanical, physical or chemical contact. Different receptors are responsible for different stimuli; these are categorized as pain, pressure or temperature changes. Special pathways exist for face sensations. The trigeminal nerve is located on the right side of the face. It extends beyond the ear, underneath and branches out towards the cheek area. Properly formulated cosmetic compositions can stimulate the receptors to produce very positive pleasant effects.
One of the oldest stimulants is 1-menthol; it imparts a cooling sensation to the skin. Menthol and related terpenes do not really cool through the effect of latent cold. Actually they heighten the perception of cold in the nerve endings in the skin, so that the surface of skin “feels cold”.
A problem with menthol is dissolving or uniformly dispersing the compound in a cosmetic delivery system. After storage, in many systems menthol has a tendency to crystallize. Severe crystallization leads to granulation effects being perceived by a consumer. Granulation is particularly evident in anhydrous systems.
Accordingly, it is an object of the present invention to provide a cosmetic composition formulated with menthol which avoids crystallization and the aesthetically displeasing effects of granulation.
Another object of the present invention is to provide a cosmetic composition incorporating menthol which enhances pleasant skin sensations while minimizing any negative properties of menthol.
These and other objects of the present invention will become more readily apparent from consideration of the following summary and detailed description.
SUMMARY OF THE INVENTION
A cosmetic composition is provided which includes:
(i) from about 0.1 to about 30% of a crosslinked non-emulsifying siloxane elastomer;
(ii) from about 1 to about 80% of a volatile polyorganosiloxane; and
(iii) from about 0.0001 to about 5% of menthol.
DETAILED DESCRIPTION OF THE INVENTION
Now it has been found that menthol can be suspended without fear of crystallization in a vehicle delivery system of a crosslinked non-emulsifying siloxane elastomer and a volatile polyorganosiloxane. Moreover, the effectiveness of menthol in providing a cooling sensation to the skin is enhanced when delivered in the elastomer and volatile polyorganosiloxane vehicle.
Crosslinked non-emulsifying siloxane elastomers are a first essential element of this invention. They will have an average number molecular weight in excess of 2,000, preferably in excess of 1,000,000 and optimally will range from 10,000 to 20 million. The term “non-emulsifying” defines a siloxane from which polyoxyalkylene units are absent. Advantageously the elastomers are formed from a divinyl compound, particularly a polymer with at least two free vinyl groups, reacting with Si—H linkages of a polysiloxane backbone such as a molecularly spherical MQ resin. Elastomer compositions are commercially available from the General Electric Company under product designation General Electric Silicone 839 with CTFA name of Cyclomethicone and Vinyl Dimethicone/Methicone Cross Polymer, delivered as 5-7.5% elastomer in a cyclomethicone carrier, and under the designation Polysilicone-11. A related elastomer composition under the CTFA name of Crosslinked Stearyl Methyl Dimethyl Siloxane Copolymer is available as Gransil SR-CYC (25-35% elastomer in cyclomethicone) from Grant Industries, Inc., Elmwood Park, N.J. The commercial products from General Electric and Grant Industries may be further processed by subjecting them to a high pressure (approximately 5,000 psi) treatment in a Sonolator with recycling in 10 to 60 passes. Sonolation achieves a resultant fluid with elastomer average particle size ranging from 0.2 to 10 micron, preferably 0.5 to 5 micron. Viscosity is best when ranging between 300 and 20,000 cps at 25° C. as measured by a Brookfield LV Viscometer (size 4 bar. 60 rpm. 15 sec.).
Amounts of the elastomer may range from about 0.1 to about 30%, preferably from about 1 to about 15%, optimally from about 3 to about 10% by weight.
A second element of the present invention is that of a volatile polyorganosiloxane. The term “volatile” refers to those materials having a measurable pressure at ambient conditions. Volatile polyorganosiloxanes useful herein may be cyclic or linear. Preferred cyclic silicones include polydimethylsiloxanes containing from about 3 to about 9 silicon atoms, preferably containing from about 4 to about 5 silicon atoms, generally known as cyclomethicones. Preferred linear silicone oils include the polydimethylsiloxane containing from about 3 to about 9 silicone atoms. The linear volatile silicones generally have viscosities of less then about 5 centistokes at 25° C., while the cyclic materials have viscosities of less than about 10 centistokes, the preferable range being from 0.1 to 8 centistokes. Examples of volatile silicone oils useful in the present invention include: Dow Corning 224, Dow Corning 245, Dow Corning 344, Dow Corning 345 and Dow Corning 200 (manufactured by the Dow Corning Corporation); Silicone 7207 and Silicone 7158 (manufactured by the Union Carbide Corporation); and SF1202 (manufactured by General Electric).
Amounts of the volatile polyorganosiloxane will range from about 1 to about 80%, preferably from about 20 to about 70%, optimally from about 30 to about 65% by weight.
Menthol is another essential element of the present invention. The material may be in dextro, levo or racemic form although the levo form is preferred. Amounts may range from about 0.0001 to about 5%, preferably from about 0.01 to about 2%, more preferably from about 0.1 to about 1%, optimally from about 0.2 to about 0.5% by weight of the cosmetic composition.
Cosmetic compositions of the present invention are particularly preferred when in the anhydrous form (less than about 5% water, preferably less than about 1% water). Yet oil and water emulsions may also be suitable for the present invention. Whether anhydrous or emulsion type, compositions of the present invention may further include a variety of pharmaceutically acceptable carriers and skin actives. Amounts of the carrier may range from about 1 to about 95%, preferably from about 5 to about 70%, optimally from about 10 to about 40% by weight. Among the carriers are emollients, water, inorganic powders, foaming agents, surfactants and combinations thereof.
Emollients are substances selected from polyols, esters and hydrocarbons. Polyols suitable for the invention may include propylene glycol, dipropylene glycol, polypropylene glycol, polyethylene glycol, sorbitol, hydroxypropyl sorbitol, hexylene glycol, 1,3-butylene glycol, 1,2,6-hexanetriol, glycerin, ethoxylated glycerin, propoxylated glycerin, xylitol and mixtures thereof.
Esters useful as emollients include:
(1) Alkyl esters of fatty acids having 10 to 20 carbon atoms. Methyl, isopropyl, and butyl esters of fatty acids are useful herein. Examples include hexyl laurate, isohexyl laurate, isohexyl palmitate, isopropyl palmitate, decyl oleate, isodecyl oleate, hexadecyl stearate, decyl stearate, isopropyl isostearate, diisopropyl adipate, diisohexyl adipate, dihexyldecyl adipate, diisopropyl sebacate, lauryl lactate, myristyl lactate, and cetyl lactate. Particularly preferred are C
12
-C
15
alcohol benzoate esters.
(2) Alkenyl esters of fatty acids having 10 to 20 carbon atoms. Examples thereof include oleyl myristate, oleyl stearate and oleyl oleate.
(3) Ether-esters such as fatty acid esters of ethoxylated fatty alcohols.
(4) Polyhydric alcohol esters. Ethylene glycol mono and di-fatty acid esters, diethylene glycol mono- and di-fatty acid esters, polyethylene glycol (200-6000) mono- and di-fatty acid esters, polyglycerol poly-fatty esters, ethoxylated glyceryl monostearate, 1,
Mohammadi Fatemeh
Vargas Anthony
Conopco Inc.
George Konata M.
Hartley Michael G.
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