Solid deodorant composition

Details Solid deodorant composition Solid deodorant composition

1999-03-23

2001-01-23

Wage, Thurman K. (Department: 1615)

Drug, bio-affecting and body treating compositions

Anti-perspirants or perspiration deodorants

C424S066000, C424S068000, C424S401000

Reexamination Certificate

active

06177066

ABSTRACT:

Anhydrous deodorant sticks have been known and used for many years. They offer many advantages with respect to other deodorant presentation forms, in particular with respect to aerosols. These advantages are, for example, high safety of use and storage, the absence of propellent gases harmful to the ozone layer, simple and economical packaging, and good stability on storage due to the absence of drying phenomena.
Use is conventionally made, as solidifying agent in anhydrous deodorant compositions, of a combination of two types of waxes, one having a relatively low melting point, namely of less than 80° C., and the other having a high melting point, that is to say of greater than 80° C.
The wax with a low melting point which is most commonly described in the literature and used in commercial products is stearyl alcohol, which has a melting point of 60° C.
The main disadvantages of the combination of a wax with a high melting point and of a wax with a low melting point, such as stearyl alcohol, are the brittleness of the bars of the sticks, reducing their durability, and the deposition on the skin of significant off-white traces which can subsequently be transferred to clothing.
The Applicant Company has now discovered that it is possible to overcome these disadvantages by using, as agent for solidifying anhydrous deodorant compositions, a mixture of waxes devoid of waxes with low melting points, that is to say a mixture composed solely of waxes all having melting points greater than 80° C.
The deodorant compositions of the present invention, solidified by such a combination of at least two waxes with high melting points, exhibit excellent durability on use and less whitening of the skin after application, while retaining their cosmetic qualities, in particular good properties on spreading, such as smoothness, slip and wear.
The subject-matter of the present invention is consequently a solid deodorant composition comprising, as solidifying agent, a mixture of waxes all having melting points of greater than 80° C., and at least one deodorant active principle.
More particularly, the mixture of waxes of the present invention comprises:
at least one synthetic polyethylene wax having a melting point of greater than 80° C., and
at least one wax of natural origin having a melting point of greater than 80° C.
The polyethylene wax or waxes have the function of conferring on the product its necessary properties of spreading, of wear and of slip. The natural wax or waxes with high melting points, in combination with the first wax or waxes, strengthen the structure of the bar of the stick and contribute the stiffness necessary to avoid the disintegration of the sticks.
The polyethylene wax with a high melting point (>80° C.) used according to the invention is an ethylene homopolymer or a copolymer of ethylene and of another copolymerizable monomer corresponding to the following formula (I):
CH
2
═CHR  (I)
in which R represents a linear or branched alkyl chain which can be interrupted by mono-or polyoxyalkylene units, an aryl or aralkyl radical or —CH
2
COOH or —CH
2
CH
2
OH radical.
The alkyl radicals more particularly denote the methyl, ethyl, propyl, isopropyl, decyl, dodecyl and octadecyl radicals.
The mono- or polyoxyalkylene units preferably denote mono- or polyoxyethylene groups or mono-or polyoxypropylene groups.
The aryl radical is preferably a phenyl or tolyl radical.
The aralkyl radical is, for example, a benzyl or phenethyl radical.
The weight-average molar mass of the polyethylene wax with a high melting point according to the invention is preferably between approximately 400 and 1000, more particularly between approximately 400 and 700 and is preferably about 500.
According to a preferred embodiment of the compositions according to the invention, the wax as defined above is chosen from ethylene homopolymers, copolymers of ethylene and of propylene, copolymers of ethylene and of maleic anhydride or acid, or oxidized or ethoxylated polyethylenes.
Mention may in particular be made, among the ethylene homopolymers which can be used according to the invention, of those sold under the names of Polywax 500, Polywax 655 and Polywax 1000 by the company Petrolite.
Mention may be made, among the ethylene copolymers which can be used according to the invention, of the copolymers of ethylene and of propylene sold under the names Petrolite® by the company Petrolite, the copolymers of ethylene and of maleic anhydride sold under the names Ceramer® by the company Petrolite, the oxidized polyethylenes sold under the names Unilin® and Unicid® by the company Petrolite, and the ethoxylated polyethylenes sold under the names Unithox® by the company Petrolite.
According to a particularly preferred embodiment of the invention, the polyethylene wax is an ethylene homopolymer wax.
In the anhydrous deodorant compositions of the present invention, the polyethylene wax as described above is used in combination with at least one second wax, which is a natural wax also having a melting point of greater than 80° C. This natural wax is chosen from mineral, fossil, animal or vegetable waxes, or hydrogenated oils, fatty esters, fatty alcohols or polyoxyethylenated fatty alcohols which are solid at 25° C.
Use may be made, as examples of waxes of natural origin in the deodorant compositions of the present invention, of microcrystalline waxes, ceresin, ozokerite, candelilla wax, carnauba wax, hydrogenated castor oil, hydrogenated palm oil or hydrogenated coconut oil.
According to a preferred embodiment of the invention, the natural wax is an ozokerite with a high melting point. Ozokerite is a fossil hydrocarbon with a complex composition corresponding to the solid residue from the evaporation of paraffin-rich petroleum.
A commercial ozokerite is the product Cerozo Blanche E626, a mixture of C
20-50
hydrocarbons sold by the company Barlocher.
The deodorant composition of the present invention comprises from 5 to 20% by weight of synthetic polyethylene wax and from 2 to 20% by weight of the said natural wax with a high melting point.
The proportion of polyethylene wax is preferably greater than that of the natural wax and the (polyethylene wax
atural wax) ratio by weight is in particular between 10/1 and 1/1 and especially between 7/1 and 3/1.
The deodorant composition of the present invention comprises, in addition to the mixture of waxes with high melting points, at least one deodorant active principle.
Within the meaning of the present invention, deodorant active principle is understood to mean any substance capable of reducing the flow of sweat and/or of masking, improving or reducing the unpleasant smell resulting from the decomposition of human sweat by bacteria.
It is, for example, an antiperspirant compound, such as aluminium and/or zirconium salts, for example an aluminium hydroxychloride or an aluminium and zirconium hydroxychloride, or alum salts, a bacteriostatic agent, a bactericidal agent, such as 2,4,4-trichloro-2-hydroxydiphenyl ether and 3,7,11-trimethyldodeca-2,5,10-trienol, and various zinc salts, an odour-absorbing agent, such as sodium bicarbonate, an antioxidizing agent, such as butylated hydroxytoluene, or a mixture of these compounds and/or agents. 3,7,1 l-Trimethyldodeca-2,5,10-trienol is, for example, sold under the name Farnesol® by the company Dragoco and 2,4,4-trichloro-2-hydroxydiphenyl ether under the name Irgacare® MP by the company Ciba-Geigy.
Mention may be made, among aluminium salts, of the product sold by the company Reheis under the name Reach 301 or by the company Guilini Chemie under the name Aloxicoll PF 40.
Aluminium and zirconium salts are, for example, that sold by the company Reheis under the name Reach A2P-908-SUF.
This deodorant active principle or mixture of deodorant active principles is present in a proportion of approximately 0.01 to 40% by weight with respect to the overall composition, preferably in a proportion of approximately 0.05 to 25% by weight.
When the deodorant active principle is an aluminium hydroxychloride or an aluminium and zirco

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