FR2652740A1 - SHAVING GEL AND PROCESS FOR PREPARING THE SAME. - Google Patents

Abstract

The invention relates to a shaving gel. According to the invention, it contains a gel intermediate, preferably the triethanolamine salt of carbomer-940, which remains in gel in an application to the skin, a lubricating agent, preferably of the polyacrylamide type and a cosmetically acceptable vehicle, of preferably deionized water, the gel intermediate being between about 0.25 and about 1.0% by weight, the lubricant between about 0.05 and about 0.5% by weight and the cosmetically acceptable vehicle between about 98.5 and about 99.70% by weight of the shaving gel. The invention applies in particular to the cosmetics industry.

Description

The present invention generally relates to a shaving gel and,

particular, to a shaving gel that

  stays gelled throughout the shaving process.

  Foams, creams and gels forming foam for shaving are known. Such shaving products usually have a soap base and are used with a razor, both by men and women, for the removal of hair on the surface of the skin. Foams and shaving creams are opaque. Common gels for shaving are initially transparent but become foamy and opaque when

application to the skin.

  Common products for shaving are far from satisfactory for several reasons. A disadvantage is that most shaving products and the protection they provide are removed from the skin after one or two passes of the razor, leaving the skin unprotected with respect to the blade in all subsequent passes of the razor. . Another disadvantage is that the consistency of the shaving product and the lack of smoothness create a friction between the razor and the skin, forcing the skin to lift or rise around the pore, thereby preventing the razor to produce shaving as close as possible and that is the cause of cuts and irritation typically suffered. Another disadvantage is that the consistency of the shaving products is such that the hair is not firmly held for maximum removal, a larger problem for women with typically softer hairs. Another disadvantage lies in the fact that the user is unable to see the hair and skin, as well as cuts, scrapes, skin disorders and the like through the opaque foam, cream or gel giving foam, that he would like to avoid while he shaves. Another disadvantage is that the soap base in the shaving products can be irritating to the skin. Another disadvantage is that any shaving product remaining on the skin after shaving must be washed or wiped off the skin and can not be rubbed directly to penetrate the skin

  to provide additional moisture to the skin.

  As a result, a shaving product that stays on the skin after one or more passes of the razor, which gives a smoother and closer shave, which minimizes or eliminates nicks, cuts and irritations of the skin, which is transparent, which does not contain soap, which can be introduced into the skin after shaving and leaves no soapy residue on the sink or

  the bathtub after rinsing is desired.

  In general, according to the present invention, a shaving gel which remains in the gel form and does not form a foam when applied to the skin is provided. The gel comprises a gel intermediate which remains in gel upon application to the skin and a cosmetically acceptable vehicle. The shaving gel may further contain a lubricating agent, a moisturizing agent, an emollient, a preservative, a stabilizer, an agent

dye and a perfume.

  According to the present invention also, a method for preparing a shaving gel which remains in gel upon application to the skin is provided. An acidic compound which can be neutralized upon the addition of a suitable base to a gel intermediate is dissolved in cold water with rapid stirring. A cosmetically acceptable vehicle is added to the solution, with all the moisturizers, emollients, preservatives or stabilizers. A suitable base is added under slow stirring in the mixture at room temperature to form a gel. To this gel is then added an agent

  lubricant and any coloring agent or perfume.

  Accordingly, it is an object of the present invention to provide an improved shaving gel. Another object of the present invention is to provide a shaving gel which remains in gel during a

application to the skin.

  Another object of the present invention is to provide a shaving gel which remains on the skin after one or more passes of the razor so that the skin

  be protected from multiple passes of the razor.

  Another object of the present invention is to provide a shaving gel which retains its high viscosity when applied to the skin and therefore allows a closer shave with fewer or no cuts or

nicks on the skin.

  It is another object of the present invention to provide a shaving gel which contains specific lubricating agents to reduce, if not eliminate, razor resistance, thereby allowing shaving as close as possible and reducing or eliminating it.

cuts and irritations.

  Another object of the present invention is to provide a shaving gel which allows a closer shave, thereby reducing the frequency of shaving and shortening the shaving time by reducing the number of passes.

  required to obtain a satisfactory shave.

  Another object of the present invention is to provide a shaving gel which maintains the hair straight and more firmly than soap-based gels for

maximum removal.

  Another object of the present invention is to provide a shaving gel which is less irritating to the

  skin than shaving products made from soap.

  Another object of the present invention is to provide a shaving gel having moisturizing and healing properties, lubricity and slippage.

razor increased.

  Another object of the present invention is to provide a shaving gel which can be penetrated into the skin after completion of the shaving process for

  give the skin extra hydration.

  Another object of the present invention is to provide a shaving gel which remains transparent after

application to the skin.

  Another object of the present invention is to provide a method for producing the shaving gel

perfected described here.

  Other objects of the invention will become

  obvious from the following description.

  The present invention provides a shaving gel which remains in gel and does not foam when applied to the skin. The main components include a gel intermediate which remains in gel and does not form foam when applied to the skin and a cosmetically acceptable vehicle. The composition does not contain any soap (water-soluble salts of high molecular weight fatty acids) or

the foam.

  The gel intermediates that can be used in the invention are well known in the cosmetic arts. They consist of an acidic compound, usually water-soluble derivatives of natural substances such as cellulose, sucrose and glucose which, upon contact with a suitable base, form a gel intermediate. Some commonly used acidic compounds include copolymers of acrylic acid and a polyallylated sucrose, and reaction products of cellulose or glucose with acids or alkylene oxides. Specific examples include Acrysol, manufactured by Rohm-Haas and carbomer-934, -940 and -941 marketed by B.F. Goodrich Co. under the trademark Carbopol 934, 940 and 941, respectively. Carbomer-940 is particularly preferred for the excellent translucency of the resulting gel intermediate. The appropriate base may be any base capable of neutralizing the acidic compound to a gel intermediate. These appropriate bases are known in cosmetics. A particularly preferred base is triethanolamine. As a result, the gel intermediate particularly

  preferred is the carbomer-940 triethanolamine salt.

  The percentage by specific weight of the gel intermediate in the total weight of the shaving gel

  will depend on the particular gel medium used.

  For triethanolamine salt of carbomer-940, the beach

  optimal is from about 0.25 to about 1.0%.

  The cosmetically acceptable vehicle can be any liquid that adds volume to the shaving gel without

  adversely affect the performance of the gel.

  Typically, the cosmetically acceptable vehicle will be

deionized water.

  The shaving gel may also contain a lubricating agent. The purpose of the lubricating agent is to lubricate the skin and provide better sliding between the razor

  and the skin. Lubricants are well known.

  The most preferred lubricating agent is polyacrylamide, a homopolymer of 2-propeneamide sold under the names Cyanamer P250, Gelamide 250 and Superfloc 16 plus by American Cyanamid Co. The ideal weight percentage of the lubricating agent in the shaving gel will depend on the particular lubricating agent used. For polyacrylamide, the optimal range is

  from about 0.05 to about 0.5%.

  A moisturizing agent may also be present in the shaving gel. The purpose of the moisturizing agent is to counteract the dryness of the skin as a result of shaving and to improve the moisture content of the skin. Various moisturizing agents are known in cosmetics, in particular lotions. For the present invention, glycerine and propylene glycol are particularly preferred in the presence of ethyl alcohol because their combination gives moisturizing, non-greasy effects. The percentage by specific weight of the moisturizing agent in the total weight of the shaving gel will depend on the particular moisturizing agent used. The optimum range of the most preferred moisturizing agent is from about 1 to about 4% glycerin and propylene glycol and from about 5 to about 20%.

of ethyl alcohol.

  Since the moisturizing agent is ideally present at a relatively high weight percent, the excess shaving gel left on the skin after the shaving process in the skin can be penetrated instead of washed. This adds an effect

extra moisturizer.

  The shaving gel may also contain an emollient. The emollient is intended to soften the skin and promote healing on the skin burns and minor cuts due to shaving. We know

  emollients in cosmetics, in particular lotions.

  The most preferred emollient is a combination of allantoin and aloe vera gel. The ideal weight percentage of the emollient in the shaving gel will depend on the particular emollient. The optimum range of the most preferred emollient is from about 0.05 to about 1% allantoin and from about

0.5 and 5% aloe vera.

  Preservatives may also be present in the shaving gel and these are known. Examples of such preservatives include N- (3-chloroallyl) hexaminium chloride, also known as quaternium-15 and diazolidinyl urea. These preservatives are available from Dow Chemical and Sutton Laboratories in Chatham, New Jersey, respectively, under the trademarks Dowicil 200 and Germall II, respectively. The percentage by specific weight of the preservative in the total shaving gel will depend on the particular preservative used. The optimal range of N- (3-chloroallyl) hexaminium chloride or diazolidinyl urea

  is from about 0.05 to about 1%.

  The shaving gel may also contain stabilizers and these are known. Stabilizer

  particularly preferred is ethylenediaminetetra-

  disodium acetate (EDTA). The percentage by specific weight of the stabilizer in the shaving gel will depend on the particular stabilizer chosen. The optimum disodium EDTA range is from about 0.05 to about 1%. A coloring agent and a perfume may also be added to the shaving gel and these are known. Examples include FD & C Blue No. 1 for Citrus Lime MF 2910 Coloring Agent and Fragrance

  dissolved in polysorbate-20 for the perfume.

  Polysorbate-20, also known as polyoxyethylene (20) sorbitan monolaurate, is a perfume solubilizer and is marketed by ICI under

the name Tween-20.

  It is believed that the aforementioned and other components may be added to the shaving gel as long as such components do not interfere with the characteristics of the shaving gel that are distinguishable from the characteristics of the soap-based gels or

  contain foam-forming agents.

  After application to the skin, the gel maintains a viscosity of between about 7.5 x 104 and about x 104 centipoise which is considerably higher than other common shaving products after application to the skin. This viscosity produces a film barrier between the razor and the skin which, especially in combination with lubricating agents, substantially or completely prevents the skin around each pore from being caught by the razor. On the contrary, the foams of common shaving products depend on bubbles for a "ball rolling" effect to prevent the skin around the pores from being caught by the razor. This effect of "ball bearing" is not as

  important or effective than the gel film.

  As the skin around the pore is prevented by the gel from being hung up and lifted, the razor can cut the hair deeper into the pore for a closer shave. In addition, cuts and cuts in the skin are substantially reduced or completely eliminated. On the other hand, because of the higher viscosity, the product of the present invention will keep the hair in a more stable position so that it can be cut more effectively by the razor. After one or more passes by means of a razor, a gel film remains on the skin, unlike common shaving products made of soap or forming foam. This film of the gel will continue to provide protection to the skin during subsequent passes of the razor. This continuous protection is important because the typical shaving process involves several passes through the razor, especially on non-shaving surfaces.

  skin planes like chin or knees.

  A unique property of the gels of the present invention lies in the fact that they can be transparent or that they can appear translucent in the assembly before application to the skin while still being transparent in the form of a thin film after application. to the skin. In order for the user to see the hair while shaving, any component added to the gel will not optimally affect the transparency of the final shaving gel, although transparency or lack thereof does not adversely affect others

  advantages of the gels of the present invention.

  In general, the production process of the shaving gel is as follows. All moisturizing agents, emollients, preservatives and stabilizers are added to the cosmetically acceptable carrier and the acidic compound. The appropriate base is slowly added, producing a gel intermediate. It is also believed that all moisturizers, emollients, preservatives and stabilizers can be added to the cosmetically acceptable carrier and base and that the acid compound can be slowly added to produce the gel intermediate. Any lubricating agents, coloring agents or perfumes can be added at this point to the gel intermediate to produce the final shaving gel. These processes can occur at

ambient temperature.

  The shaving gel can be dispensed using conventional known packaging, such as collapsible metal tubes and pressurized aerosol dispensers. However, because of the unique properties of the present invention, the shaving gel can also be dispensed in packages that have hitherto not been used for shaving products. Examples of these new packages include clear plastic tubes, clear or opaque bottles and high viscosity dispenser (HVD) pumps such as the HVD pump marketed by Calmar. The following example of the present invention is to illustrate it and should in no way limit the scope.

Example

  The shaving gel described in the table was prepared as follows:

Board

  No. Ingredient% by weight 1 Deionized water 34.59 2 Carbomer-940 (2% solution) 37.50 3 Alcohol SD 40 15.00 4 Gel Aloe Vera 1: 1 0.50 Glycerin 96% 3.00 6 Propylene glycol 2.00 7 Quaternium-15 0.10 8 Diazolidinyl urea 0.30 9 Disodium EDTA 0.10 Allantoin 0.10 11 Triethanolamine 99% 0.75 12 Polyacrylamide (3% solution) 5.00 13 Blue No. 1 of FD & C (1%) 0.01 14 Polysorbate-20 1.00 Perfume Citrus Lime MF 2910 0.05

100.00

  A 2% carbomer-940 solution (No.2) was prepared by pouring carbomer-940 into cold water with rapid stirring. The resulting dispersion was added at room temperature to deionized water (No. 1) itself at room temperature. To this mixture was added SD 40 alcohol, aloe vera gel, glycerine, propylene glycol, quaternium-15, diazolidinyl urea, disodium EDTA and allantoin (No.3-No.10). Under slow stirring, triethanolamine (No.11) was added at which point the resulting gel became transparent. A 3% polyacrylamine solution No.12 was prepared by spraying dry polyacrylamide in water. This solution was added to the gel, followed by blue No.1 FD & C (No.13). The perfume Citrus Lime MF 2910 (No.15) was predissolved in polysorbate-20 (No.14) then this

mixture was added to the gel.

  All processes were done at

ambient temperature.

  It can be seen that the stated objectives

  above, among those made apparent by the description

  above, are effectively achieved.

Claims (10)

CLAIMS CATIONS   1. Shaving gel characterized in that it comprises a gel intermediate which remains in gel during application to the skin and a cosmetically acceptable vehicle. 2. Shaving gel according to claim 1, characterized in that the gel intermediate is the triethanolamine salt of carbomer-940 and preferably has a concentration of between about 0.25 and about 1.0% by weight of the gel. to shave and the cosmetically acceptable carrier is deionized H 2 O and preferably at a concentration of from about 99.0 to about 99.75% by weight of the shaving gel.   3. Shaving gel according to claim 1, characterized in that the cosmetically acceptable vehicle also contains a lubricating agent, preferably polyacrylamide and, preferably) at a concentration of between about 0.05 and about 0.5%. by weight of the shaving gel.   4. Shaving gel according to claim 3, characterized in that the cosmetically acceptable vehicle also contains a moisturizing agent, an emollient, a preservative and a stabilizer and in that the moisturizing agent is preferably glycerine, propylene glycol. and ethyl alcohol and, preferably, glycerine and propylene glycol each have a concentration of from about 1 to about 4% by weight of the shaving gel and the ethylene glycol is at a concentration of from about 5 to about 20% by weight of the shaving gel; the emollient is preferably allantoin and aloe vera gel and, preferably, allantoin has a concentration of between about 0.05 and about 1% by weight of the shaving gel and the aloe gel vera has a concentration of between about 0.5 and 5% by weight of the shaving gel; the preservative is preferably selected from the group consisting of N- (3-chloroallyl) hexaminium chloride, diazolidinyl urea and combinations thereof, and preferably at a concentration of from about 0.05 to about 1% by weight of the gel for shaving and the stabilizer is preferably disodium ethylenediaminetetraacetate and preferably has a concentration of about   0.05 and about 1% by weight of the shaving gel.   5. Shaving gel according to claim 4, characterized in that the cosmetically acceptable vehicle also contains a coloring agent and a perfume. 6. Shaving gel according to claim 1, characterized in that it has a viscosity between   about 7.5 x 104 and about 15 x 104 centipoise.   7. Shaving gel according to claim 1, characterized in that it is transparent and remains   transparent when applied to the skin.   8. A shaving gel characterized in that it comprises a gel intermediate, preferably the triethanolamine salt of carbomer-940, which remains in gel during application to the skin, a lubricating agent, preferably polyacrylamide and a cosmetically acceptable carrier, preferably deionized H2O, wherein the gel intermediate is from about 0.25 to about 1.0% by weight, the lubricating agent from about 0.05 to about 0.5% in weight and the cosmetically acceptable vehicle between about 98.5 and about 99.70% by weight of the shaving gel.   9. A shaving gel characterized in that it comprises: a) a gel intermediate, preferably the triethanolamine salt of carbomer-940 which remains in gel when applied to the skin, between about 0.25 and about 1.0% by weight; b) a lubricating agent of from about 0.05 to about 0.5% by weight, preferably polyacrylamide; c) a moisturizing agent of from about 7 to about 25% by weight, preferably glycerin, from about 1 to about 4% by weight, propylene glycol, from about 1 to about 4% by weight, and alcohol ethyl, from about 5 to about 20% by weight of the shaving gel; d) an emollient of from about 0.5 to about 6% by weight, preferably allantoin, of from about 0.05 to about 1% by weight and aloe gel from about 0.5 to 5% by weight; % by weight of the shaving gel; e) a preservative of from 0.05 to about 1% by weight, preferably N (3-chloroallyl) hexaminium chloride, from about 0.00 to about 1% by weight and diazolidinyl urea, from about 0, 00 and about 1% by weight of the shaving gel; f) a stabilizer of between about 0.05 and   about 1% by weight, preferably ethylenediamine,   disodium tetraacetate; g) a coloring agent of from about 0.00 to about 0.05% by weight, preferably FD & C blue No. 1; h) a perfume of from about 0.00 to about 1.50% by weight, preferably Citrus Lime MF 2910 perfume dissolved in polysorbate-20, and i) a cosmetically acceptable vehicle of from about 60.95 to about 92. , 10% by weight, preferably deionized H 2 O.   10. A method for preparing a shaving gel characterized in that it consists in: a) dissolving, in cold H2O, with rapid stirring, an acidic compound, preferably carbomer-940, which can be neutralized at the time of adding a suitable base, preferably triethanolamine, to a gel intermediate which remains in gel upon application to the skin; b) adding, at ambient temperature, a cosmetically acceptable vehicle to the solution of step a), and preferably also a moisturizing agent, an emollient, a preservative and a stabilizer; c) adding the appropriate base, under slow stirring and at room temperature, to the solution of step b) to form a gel; and d) adding, at ambient temperature, a lubricating agent, preferably polyacrylamide, to the gel of step c) and preferably also adding an agent dye and a perfume.