Patent Application
20060029553
1. Field of the Invention
The present invention relates to deodorant spray preparations.
2. Description of the Prior Art
Deodorant products which are designed to prevent malodor and a sticky or tacky skin feeling each caused by perspiration have been widely used in the form of powder spray. Powder spray preparations are required not to form white residue caused by aggregation of powders sprayed onto the skin and not to provide unpleasant skin feeling such as sticky or tacky feeling. To meet such requirements, several techniques have been hitherto proposed.
For example, a liquid antiperspirant composition containing an antiperspirant such as aluminum hydroxychloride, an alcohol and a polyether-modified silicone is described in JP 5-229925A. The proposed antiperspirant composition is designed to prevent the formation of white residues of antiperspirant particles by the incorporation of the polyether-modified silicone and the alcohol. However, when a powdery material, in addition to the antiperspirant, is further incorporated to enhance a skin feeling such as silky feeling, the proposed antiperspirant composition fails to exhibit a sufficient effect on the prevention of white resides.
A powder aerosol composition containing an inorganic powder such as talc, silicic anhydride, kaolin, and aluminum hydroxychloride combined with a nonionic surfactant or a silicone oil is described in JP 3-157327A. Although effective for preventing the formation of white residues upon spraying, the proposed powder aerosol composition provides a strong oily feeling and fails to provide a silky feeling attributable to the powdery material.
In addition, an antiperspirant/deodorant composition incorporated with powders of spherical silicone rubber is described in JP 8-12545A and U.S. Pat. No. 5,628,989, and an aerosol composition containing composite powders made of different kinds of organopolysiloxanes is described in JP 11-335254A. Although these compositions provide a silky feeling on its use, the prevention of white residues is insufficient.
The inventors have found that a deodorant spray preparation containing an antiperspirant and/or an antimicrobial agent which is further incorporated with an unsaturated fatty acid and an antioxidant prevents the formation of white residues upon spraying while providing a silky skin feel with little tackiness and stickiness.
Thus, the present invention provides a deodorant spray preparation containing (A) an antiperspirant and/or an antimicrobial agent, (B) an unsaturated fatty acid, (C) an antioxidant, and (D) a propellant.
The deodorant spray preparation of the present invention (hereinafter also referred to as “composition of the present invention”) contains an antiperspirant and/or an antimicrobial agent as the component (A). Examples of the antiperspirants include aluminum chlorohydrate, aluminum-zirconium composite salts, and aluminum chloride. Examples of the antimicrobial agents include triclosan, isopropylmethylphenol, benzoic acid, benzalkonium chloride, and trichlorocarbanilide. Each of the antiperspirants and the antimicrobial agents may be used alone or in combination of two or more. The antiperspirant and the antimicrobial agent may be used in combination.
The content of the antiperspirant is preferably from 0.01 to 5% by weight and more preferably from 0.05 to 3% by weight, and the content of the antimicrobial agent is preferably from 0.005 to 0.2% by weight and more preferably from 0.01 to 0.1% by weight, each based on the total amount of the composition including the propellant (D).
An unsaturated fatty acid is used as the component (B) of the composition of the present invention. Preferred are unsaturated fatty acids having from 14 to 22 carbon atoms, and more preferred are those having from 14 to 18 carbon atoms. Specific examples thereof include myristoleic acid, palmitoleic acid, oleic acid, linoleic acid and linolenic acid.
The composition of the present invention contains one or more kinds of such unsaturated fatty acids. The content of the unsaturated fatty acid is preferably from 0.01 to 1% by weight, more preferably from 0.02 to 0.5% by weight, and still more preferably from 0.05 to 0.3% by weight, each based on the total amount of the composition including the propellant (D). If the content is 0.01% by weight or more, the composition exerts the effect of preventing the formation of white residues. If the content is 1% by weight or less, a pleasant skin feeling with less oiliness is provided without generating specific fatty acid odor.
The composition of the present invention contains an antioxidant as the component (C) to enhance the long-lasting deodorant effect. Examples of the antioxidants include dibutylhydroxytoluene (BHT), butylhydroxyanisole, vitamin E and its derivatives, catechins, flavonoids, and polyphenols. These antioxidants may be used alone or in combination of two or mere.
In view of the balance between long-lasting deodorant effect and production economy, etc., the content of the antioxidant is preferably from 0.0001 to 0.1% by weight and more preferably from 0.0005 to 0.03% by weight, each based on the total amount of the composition including the propellant (D).
The ratio of the contents of the component (C) and the component (B), (C)/(B), is preferably from 1/100 to 1/2 and more preferably from 1/50 to 1/5. If the ratio (C)/(B) is 1/100 or more, the long-lasting deodorant effect is enhanced sufficiently, while a ratio of 1/2 or less is preferred in view of production economy.
In the present invention, the formation of white residues of powdery components such as the component (A) is effectively prevented by formulating a composition containing the components (A), (B) and (C) into the deodorant spray preparation.
For formulating the deodorant spray preparation, a propellant is used as the component (D). Examples of the propellants include freon gases such as freon 134a and freon 113; hydrocarbon gases such as propane, isobutane and isopentane; liquefied gases such as dimethyl ether; carbon dioxide gas; and nitrogen gas. The content of the propellant (D) is preferably from about 60 to about 99% by weight based on the total amount of the composition of the present invention.
The composition of the present invention optionally contains an oil that is in liquid state at room temperature, as long as the effects of the present invention are not adversely affected. Examples of such oils include silicone oils such as dimethylsilicone, decamethylcyclopentasiloxane, methylphenylsilicone and methylcyclopolysiloxane; modified silicone oils such as polyoxyethylene-methylpolysiloxane copolymers; and fatty acid esters such as myristyl myristate, isopropyl myristate, isopropyl palmitate and neopentyl glycol dicaprylate.
These oils may be used alone or in combination of two or more. The content of the oil, if used, is preferably from 0.1 to 25% by weight and more preferably from 0.3 to 15% by weight, each based on the total amount of the composition including propellant.
The composition of the present invention may contain, if necessary, an inorganic or organic powder other than the component (A). Examples of the inorganic powders include talc, sericite, mica, kaolin, red iron oxide, clay, bentonite, silicic anhydride, and synthetic silica beads. Examples of the organic powders include silicone resins such as vinyl dimethicone/methicone silsesquioxane crosspolymers (block copolymers of crosslinked silicone and reticular silicone) and methicone silsesquioxane (methylsiloxane reticular polymers), for example, “KMP-590” manufactured by Shin-Etsu Chemical Co., Ltd., “Tospearl® 145” and “Tospearl® 2000B” each manufactured by GE Toshiba Silicones, and “Trefil®” manufactured by Dow Corning Toray Silicones Co., Ltd.); nylon resins (for example, “SP-500” manufactured by Toray Industries Inc.); polystyrene resins (for example, “Finepearl” manufactured by Sumitomo Chemical Co., Ltd., “Techpolymer SB” manufactured by Sekisui Plastics Co., Ltd. and “Fine Powder SGP” manufactured by Soken Chemical & Engineering Co., Ltd.); polyethylene resins (for example, “Flo-Beads®” manufactured by Sumitomo Seika Chemicals Co., Ltd.); polymethyl methacrylate resins (for example, “Matsumoto Microsphere M” manufactured by Matsumoto Yushi-Seiyaku Co., Ltd., “Techpolymer MB” manufactured by Sekisui Plastics Co., Ltd. and “Fine Powder MP” manufactured by Soken Chemical & Engineering Co., Ltd.); divinylbenzene resins; polyurethane resins; benzoguanamine resins; melamine resins; phenol resins; fluorine-containing resins and fine polymer particles prepared by the dispersion polymerization of vinyl monomer in a solvent in the presence of a dispersing agent such as a polysiloxane compound that is monoterminated with a radical-polymerizable group (JP 11-181003A).
These powders may be used alone or in combination of two or more. The content of the powder, if used, is preferably from 0.1 to 25% by weight and more preferably from 0.3 to 15% by weight, each based on the total amount of the composition including propellant (D).
The composition of the present invention may further contain, if necessary, polyhydric alcohol such as glycerol, 1,3-butylene glycol and 1,4-butylene glycol, pigment, dyestuff, fragrance, cooling agent, anti-inflammatory agent, humectant, stabilizer, etc., as long as the use thereof is not adversely affect the effects of the present invention.
The following examples further describe and demonstrate embodiments of the present invention. The examples are given only solely for the purpose of illustration and are not to be construed as limitations of the present invention.
Each deodorant spray preparation having the formulation shown in Table 1 was prepared in a manner described below. The amounts given in Table 1 are expressed as percentages by weight.
The components except for the component (D) propellant shown in Table 1 were mixed uniformly. The resultant uniform mixture was poured into a spray container, which was then filled with LPG to prepare each deodorant spray preparation.
Evaluation Method
A given amount of the deodorant spray preparation was uniformly applied by spraying to the upper arms of ten expert panelists. Each panelist organoleptically evaluated the retention of silky feeling and the formation of white residues according to the following scores. The scores reported by the panelists were summed up and the results were ranked according to the averaged scores. The evaluation results are shown in Table 1 together with the formulations of the deodorant spray preparations.
(1) Retention of Silky Feeling (Evaluated by the Degree of Silky Feeling After One Hour of Application)
Evaluation Scores
X: 1.0 to 1.4
*1: “Reach 501” manufactured by REHEIS
*2: vinyl dimethicone/methicone silsesquioxane crosspolymer, “KSP 105” manufactured by Shin-Etsu Chemical Co., Ltd.
*3: methicone silsesquioxane, “KMP-590” manufactured by Shin-Etsu Chemical Co., Ltd.
*4: polyoxyethylene-methylpolysiloxane copolymer, “SH 3775” manufactured by Shin-Etsu Chemical Co., Ltd.
The results show that the deodorant spray preparations of the present invention, which contain an antiperspirant and/or an antimicrobial agent, an unsaturated fatty acid, an antioxidant, and a propellant, are excellent in both the retention of silky feeling and the effect for preventing the formation of white residues.
The deodorant spray preparations of the present invention suppress the perspiration, prevent the formation of white residues due to aggregations of powders upon spraying, and provide a pleasant silky feeling with no unpleasant skin feeling such as tacky and sticky feeling.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2004-232350 | Aug 2004 | JP | national |
