Drug – bio-affecting and body treating compositions – Anti-perspirants or perspiration deodorants
Reexamination Certificate
2000-11-22
2002-06-11
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Anti-perspirants or perspiration deodorants
C066S078000, C066S08200S, C066S08200S, C066S08200S
Reexamination Certificate
active
06403070
ABSTRACT:
The present invention relates to an anhydrous deodorant cosmetic composition comprising at least one deodorant active agent, at least one block copolymer, at least one fat-absorbing substance, and at least one synthetic oil.
Many different types of nonaqueous (anhydrous) deodorant compositions have been described in the literature and have appeared on the market in forms such as gels, sticks, creams, roll-ons and aerosols. The solid and semi-solid forms, that is gels, sticks and creams, generally comprise a substance with a liquid base which is solidified or thickened by a consistency agent. These forms of compositions represent one subject of the present invention.
Compositions in a solid form and those in a semi-solid form generally comprise one of:
(a) a solution of at least one active ingredient in a suitably chosen solvent, (b) a suspension of at least one active ingredient in a nonsolvent medium and (c) a dispersion or emulsion (i) in the continuous phase in which is dispersed a solution of at least one active ingredient, or
(ii) for which the dissolved at least one active agent constitutes the continuous phase.
There remains, however, a need for a deodorant cosmetic composition having at least one desired property chosen from stability, homogeneity and rheological properties on application. In addition, the composition should not leave a visible, such as a white, residue on the skin either upon application or after application and drying of the composition and/or should leave skin soft to the touch.
The use of at least one gelling agent comprising styrene/elastomer block copolymers in mineral oils has previously been recommended for deodorant sticks in Patent Application WO 94/12190, the disclosure of which is incorporated herein by reference. However, such sticks may leave an undesirable greasy residue on the skin and may not exhibit at least one of the desired advantages mentioned above.
The Inventors have discovered that when an effective amount of at least one fat-absorbing substance and an effective amount of at least one synthetic oil is included with at least one deodorant active agent and at least one block copolymer derived from (i) at least one monomer of styrene and (ii) at least one thermoplastic entity chosen from thermoplastic monomers and thermoplastic comonomers to form a deodorant cosmetic composition, it may be possible to significantly improve the deodorant cosmetic composition and it may be possible to obtain at least one of the above-identified desired properties, such as all of the above-identified desired properties.
By virtue of the present invention it can be possible to obtain stable and homogeneous compositions with a viscosity suitable for a variety of forms (e.g. sticks, gels, and creams) which do not exude and which spread very well over the skin without leaving a visible white and/or greasy residue on application or after drying of the applied deodorant cosmetic composition.
Specifically, one embodiment of the present invention is directed to an anhydrous deodorant cosmetic composition comprising (i) at least one deodorant active agent; (ii) at least one block copolymer chosen from diblock copolymers, triblock copolymers, multiblock copolymers and radial block copolymers, wherein said at least one block copolymer comprises at least one segment derived from at least one styrene monomer and at least one segment derived from at least one thermoplastic entity chosen from thermoplastic monomers and thermoplastic comonomers; (iii) at least one fat-absorbing substance; and (iv) at least one synthetic oil.
Another embodiment of the present invention is directed to an anhydrous deodorant cosmetic composition comprising (i) at least one deodorant active agent in a concentration ranging from 0.1% to 40% by weight relative to the total weight of the composition; (ii) at least one block copolymer chosen from diblock copolymers, triblock copolymers, multiblock copolymers and radial block copolymers, wherein said at least one block copolymer comprises at least one segment derived from at least one styrene monomer and at least one segment derived from at least one thermoplastic entity chosen from thermoplastic monomers and thermoplastic comonomers and wherein said at least one block copolymer is present in a concentration ranging from 0.1% to 7% by weight relative to the total weight of the composition; (iii) at least one fat-absorbing substance in a concentration ranging from 0.1% to 20% relative to the total weight of the composition; and (iv) at least one synthetic oil in a concentration ranging from 5% to 90% relative to the total weight of the composition.
According to the present invention, the term “deodorant active agent” refers to a substance which is capable of at least one of: (1) reducing the flow of sweat and (2) masking, (3) improving and (4) reducing an unpleasant odor resulting from the bacterial decomposition of human sweat.
For example, the at least one deodorant active agent may be chosen from antiperspirant compounds, alum salts, bacteriostatic agents, bactericidal agents (such as, for example, 2,4,4′-trichloro-2′-hydroxydiphenyl ether and 3,7,11-trimethyldodeca-2,5,10-trienol), various zinc salts and odor-absorbing agents (such as sodium bicarbonate and zinc pidolate (zinc pyrrolidonecarboxylate)). Non-limiting examples of antiperspirant compounds include aluminum salts (such as, for example, aluminum chlorohydrate, aluminum hydroxychloride), zirconium salts and aluminum and zirconium salts.
3,7,11-Trimethyldodeca-2,5,10-trienol is, for example, sold under the name Farnesol® by Dragoco and 2,4,4′-trichloro-2′-hydroxydiphenyl ether is sold under the name Irgacare® MP by Ciba-Geigy.
Non-limiting examples of aluminum salts that may be used as the at least one deodorant active agent according to the present invention include aluminum hydroxychloride, sold by Reheis under the name Reach 301 and by Guilini Chemie under the name Aloxicoll PF 40. Non-limiting examples of aluminum and zirconium salts that may be used according to the present invention include the salt sold by the company Reheis under the name Reach A2P-908-SUF.
Complexes of zirconium hydroxychloride and aluminum hydroxychloride and glycine, commonly known under the name “ZAG complexes,” may also be used according to the invention.
The diblock copolymers, triblock copolymers, multiblock copolymersand radial block copolymers comprising at least one segment derived from at least one styrene monomer and at least one segment derived from at least one thermoplastic entity chosen from thermoplastic monomers and thermoplastic comonomers which can be used according to the present invention include, for example, those disclosed in U.S. Pat. No. 5,221,534, the disclosure of which is incorporated herein by reference.
For example, the at least one block copolymer may be chosen from those copolymers comprising at least one segment derived from at least one thermoplastic entity chosen from ethylene/C
3
-C
4
alkylene segments, such as hydrogenated copolymers comprising at least one styrene block and at least one ethylene/C
3
-C
4
alkylene block.
According to the present invention, the deodorant cosmetic composition can comprise a blend in mineral oil comprising (i) a hydrogenated copolymer comprising butylene/ethylene blocks and styrene blocks and (ii) a hydrogenated copolymer comprising ethylene/propylene blocks and styrene blocks. For example, a blend comprising, in a concentration ranging from 1% to 20% by weight relative to the total weight of the composition, (i) a hydrogenated copolymer comprising butylene/ethylene blocks and styrene blocks and (ii) a hydrogenated copolymer comprising ethylene/propylene blocks and styrene blocks, and, in a concentration ranging from 80% to 99% by weight relative to the total weight of the composition, mineral oil is within the scope of the present invention.
Such blends of copolymers are sold, for example, by Penreco under the trade names Versagel M200 and Versagel M750 or by Aiglon under the trade names Transgel or Syngel (90
Aubert Lionnel
Pataut Françoise
Dodson Shelley A.
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
L'Oreal (S.A.)
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