JPH08198735A - Shaving gel - Google Patents

Abstract

PURPOSE: To provide a non-foaming shaving gel composed of a specific composition, directly applicable to the dry skin or hair, giving good shaven state and comfortable feeling to the skin, leaving no oily component and sticky feeling on the skin after shaving and free from stimulation to the skin. CONSTITUTION: This shaving gel contains (A) 0.05-4% carboxypolymethylene (preferably a carbomer), (B) 2-52% polyhydric alcohol (preferably glycerol), (C) <=5% silicone derivative (preferably a polymer of polyoxyethylene and/or polyoxypropylene side chain and dimethyl siloxane), (D) <=4% antipruritic agent (preferably menthol), (E) <=1% antiseptic agent (preferably methyl p- hydroxybenzoate), (F) <=1% chelating agent (preferably disodium edetate), (G) <=8% neutralizing agent (preferably triethanolamine, etc.), (H) <=10% solubilizing agent (preferably hydrogenated castor oil), (I) <=0.4% ultraviolet absorber, (H) <=17% perfumery and the remaining part of water.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to aqueous, non-foaming shaving gels.

[0002]

2. Description of the Related Art Conventionally, essentially two methods have been used by men and women to shave unnecessary hair on the face and other parts of the body. The first method is a dry method using an electric razor, and the second method is a wet method using a safety razor or a single-blade razor. The main advantages of electric razors are simplicity and safety. The electric razor can be used wherever there is power supply from the power source, and the battery operated razor can be used anywhere. Furthermore, the electric razor can be used safely and comfortably in moving vehicles such as airplanes. When using an electric razor, it is not necessary to moisten the skin or hair to be shaved or apply soap in advance. Furthermore, this dry shaving method does not require soap, water or towels. For these reasons, dry shaving methods using electric razors have been selected by many people who travel frequently. However, the dry shaving method using an electric shaving machine has some drawbacks. The main of these is that electric shaving machines do not provide complete shaving as do wet shaving methods using razors. Furthermore, because of the shape and size of the blade of the electric shaving machine, it is difficult to shave all the desired parts of the skin. Finally, when introducing the electric razor,
It costs considerably more than a razor and requires electricity from a power source or battery. The wet method using a razor has the advantage that it allows a complete shave at a very low cost. Furthermore, by operating the razor,
You can shave any part of your skin without difficulty. The main drawback of the razor shaving method is the need to moisten, and if desired soften and lubricate the skin and hair in the shaving area. In Roman times this was done by applying olive oil to the skin and hair. Recently, a method of applying soap and water bubbles to the shaving area has been developed, and many soaps have been specially developed for this purpose. However, these soap bubbles are time consuming and inconvenient to use and the soap content left on the skin must be washed off after shaving. The use of these foams is particularly inconvenient for travelers, as a result of the need for water and towels. Many types of shaving cream are currently marketed as an alternative to soapy water bubbles. These are modified vanishing creams that are applied directly to the face without mixing with or dissolving in water. These shaving creams offer a convenient means compared to soap and water bubbles. However, these shaving creams are oily and unpleasant because they leave oily and sticky components on the skin unless washed off after shaving. For this reason, soap, water and towels are required to shave satisfactorily using shaving cream. Another popular method for moisturizing, softening and slipping the skin and hair prior to razor shaving is aerosol shaving foam. These shaving foams are jetted directly from the pressure vessel so they are quick and convenient to use. However, this foam has the same drawbacks as the soap and water bubbles and the shaving cream described above in that it leaves oil or soap on the skin after shaving. For comfort and hygiene reasons these residues need to be washed off after shaving,
You will need soap, water and a towel. Another drawback of aerosol shaving foams is that they do not properly wet the surface of the beard and skin, especially when the beard is long. This is due to the physical properties of the foam and the slow flow of liquid through the foam. Aerosol-type shaving foam containers are bulky and inconvenient to carry for travel, and cannot be carried on an airplane unless the luggage compartment is pressurized.
In addition, aerosol type shaving foam is known to be harmful to the environment.
C) or hydrocarbon jetting agents and blowing agents are used.
GB-A-1279145 (SC C. Johnson)
& Son, Inc. ) Discloses various formulations of post-foaming gel, including various formulations for applying to the skin before shaving with a razor. 32 to 3 degrees Celsius for this formulation
It contains at least one chemically inert component having a vaporization pressure of 0.71 to 1.5 atm in the temperature range of 8 degrees, which is called a post-blowing agent. This gel is packed in an aerosol-type pressure container, and after that, the gel is squirted from the container to the foaming agent, and in a stationary environment, it hardly foams for at least 60 seconds, but the gel is rubbed with a finger or skin. The vaporizing pressure is selected so that bubbles are generated by the volatilization action of the post-foaming agent. After this, the action of the foaming agent is improved to wet the shaving portion. However this GB
The formulations published in A-1279145 include soap and often oil. as a result,
This formulation leaves oils and greasiness that must be washed off with soap, water and a towel on the skin after shaving. Therefore, even with these formulations, the main problem of wet shaving using a razor cannot be solved. In addition, the post-foaming gel mixture is contained in a bulky pressurized container and the propellants and post-foaming agents are as harmful to the environment as those used in existing aerosol shaving foams. . GB-B-2167429 (Alan John
Robertson) discloses an aqueous, non-foaming gel specifically intended for traveler use. This gel neutralizes 0.05 to 2% carboxypolymethylene, 5 to 50% lower alkanol, 3% antipruritic, 0.5% preservative and 0.5% chelating agent. Up to 0.5% of the agent, up to 10% of the solubilizer, up to 5% of the fragrance, and the balance water. This carboxypolymethylene functions as a gelling agent. The lower alkanol is a volatile monohydric alcohol, preferably ethanol, but may be isopropanol, n-butanol or amyl alcohol. The main advantage of this claimed formulation is that the composition is free of soaps and oils. As a result, the claimed formulation does not leave oil or greasy skin after shaving, so there is no need to wash off after shaving. As a result, the claimed shaving gel can be used with a razor without the need for soap, water or towels. The main drawback of gels of this construction is that they do not provide a complete and comfortable shave because they do not soften or lubricate the skin or hair to be shaved when used directly on dry skin or hair. In addition, the use of water and lower alkanols as the base for shaving gels causes the skin to dry and irritate.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a shaving gel used for shaving with a razor. This gel is applied directly to dry skin and hair, provides a good shave and a comfortable shave, does not leave oil or stickiness after shaving, and does not dry or irritate the skin .

[0004]

In the present invention, a non-foaming shaving gel having the following composition is provided. Carboxypolymethylene is 0.05-4.0%, polyhydric alcohol is 2.0-52.0%, silicon derivative is up to 5%, antipruritic is up to 4%, one or more preservatives is 1%. Up to 1% of chelating agent, up to 8% of neutralizing agent, up to 10% of solubilizing agent, up to 0.4% of UV absorber, up to 7% of perfume, the rest being water. The composition ratios and the content ratios in the present invention and the specification and the abstract are by weight. The definitions of the above constituents are found in N.W., Washington, USA.
W. According to the third edition of the CTFA Cosmetic Ingredient Dictionary of the American Cosmetic Industry Association on Vermont Avenue 1110.

[0005]

In the formulation of the present invention, carboxypolymethylene mainly acts as a gelling agent. Carboxypolymethylene may be any of the vinyl polymers having active carboxyl groups used in cosmetic production. The preferred polymer is a polymer of acrylic acid cross-linked with functional aids,
It is listed as carbomer in the CTFA Cosmetic Ingredient Dictionary. A particularly desirable polymer is B.I. F. CARBOPO, a registered trademark of Goodrich Chemical Company
It is sold as L940. The amount of carbomer used is determined by various factors such as the packaging form and the like, and a desirable composition ratio is 0.25% to 1.5%. The polyhydric alcohol is added for the purpose of giving the effect of softening the beard and skin to be shaved. In addition, polyhydric alcohols are good lubricants, which give a better shave finish and shave comfort. Finally, the polyhydric alcohol remaining on the skin after shaving is absorbed by the epidermis, resulting in a softening effect on the skin and a moisturizing effect. The preferred polyhydric alcohol for the constitution of the present invention is glycerin, and the desirable constitution ratio is 10 to 20%. Silicon derivative is selectively blended for the purpose of further lubricating the skin and hair to be shaved,
For cosmetic use, polymers of polyoxyethylene and / or polyoxypropylene side chains and dimethylsiloxane are desirable, and these are listed as dimethicone copolyol in the CTFA dictionary of cosmetic ingredients. An antipruritic agent is also selectively incorporated into the non-foaming gel of the present invention in order to reduce irritation and itching of the skin after shaving. Any known antipruritic agent can be used. Menthol is desirable because it is inexpensive, has a good scent and gives the skin a refreshing feel. The desirable composition ratio of the antipruritic is 1 to 2%. Due to the potential for microbial growth in aqueous gels, the non-foaming gels of the invention may contain one or more preservatives. Any preservative suitable for cosmetics can be used. The preferred preservative formulation is methyl P-hydroxybenzoate, commonly known as methylparaben, in a composition ratio of 0.05% to 0.2%. Carbomer gels are easily destroyed by the presence of dissolved metal ions. Therefore, it is desirable that the non-foaming gels of the present invention include a suitable chelating agent to sequester dissolved metal ions and prevent carbomer degradation. The preferred chelating agent is disodium edetate (EDTA.2Na), and the desirable composition ratio of the chelating agent is 0.25% to 1.00.
%. The active carboxylic acid groups must be neutralized to form a stable carbomer gel. The properties of the neutralizing agent and the PH value of the formulation have a notable effect on the properties of the product, especially on the viscosity side. While there are many neutralizers that have been found to be suitable, the alkanolamines are preferred neutralizers. Particularly preferred neutralizing agents are monoisopropylamine and triethanolamine. Although it is desirable that the neutralizing agent be added sufficiently to raise the PH value of the formulation to the range of 5.5 to 7.5, the final selection of neutralizing agent and PH value will depend on the individual needs of the final product. Depends on the form of packaging. The non-foaming shaving gel of the present invention may optionally include perfume to suit the taste of the public. Further, the gel may include a colorant. When a fragrance is added to the non-foamed shaving gel of the present invention, it is desirable to add a solubilizer for dispersing the aromatic oil of the fragrance in the aqueous matrix of the gel.
The preferred solubilizer for this purpose is that described in the CTFA Cosmetic Ingredient Dictionary as PEG-60 hydrogenated castor oil. This solubilizer has a function to help moisturize the skin and hair. When the shaving non-foaming gel of the present invention is packed in a container that is exposed to sunlight, it is recommended to incorporate an ultraviolet absorber. Preferred UV absorbers known for cosmetics include benzophenone-3 and benzophenone-4. The non-foaming shaving gel of the present invention can be packaged in bottles, tubes or small bags. Especially for convenience for traveling and when there is no facility for shaving according to the conventional method, a preferable packaging method of the gel of the present invention is considered to be 5 to 10 ml of aluminum foil. It is a method of packing in a small bag of laminated paper or synthetic resin. It is also possible to bundle a napkin and a razor together with the shaving gel contained in this container to make a disposable shaving set.

[0006]

EXAMPLES The following are references for specific examples of the practice of the present invention. Example 1.823 ml water, 150 g glycerin, 20 g
Triethanolamine, 5 g CARBOPOL 9
A transparent gel was prepared in which 40, 1 g of methylparaben and 1 g of disodium edetate (EDTA · 2Na) were mixed well. After the gel was left at room temperature for 2 hours, 5 g of gel was applied to the face of a male tester 48 hours after shaving, the shaving giving satisfactory results. The surface of the face was wiped clean, leaving no oil or stickiness. Example 2.813 ml water, 150 g glycerin, 20 g
Of triethanolamine, 10 g of dimethicone copolyol, 5 g of CARBOPOL 940, 1 g of methylparaben and 1 g of disodium edetate were mixed in a clear gel. Testing was done in the same way with this gel. The shaving comfort was smoother and better lubricated than in Example 1. Example 3.793 ml water, 150 g glycerin, 20 g
Triethanolamine, 20g menthol, 10g
Dimethicone copolyol, 5g CARBOPOL
A gel was prepared in which 940, 1 g of methylparaben and 1 g of disodium edetate were mixed well. Testing was done in the same way with this gel. Shaving was more comfortable than in Examples 1 and 2. Example 4. Gels were made by the methods of Examples 1 to 3, and each was stored in a closed container for 3 months and then subjected to the same test. In both cases, no deterioration was observed in the appearance and the effect of trial use. Example 5. Each of the gels prepared by the methods of Examples 1 to 3 was placed in a small bag of synthetic resin in an amount of 5 ml, heat-welded and packaged, and the content was sufficient for one shaving. The above is presented only as a reference example.
Many formulations within the scope of the present invention will be conceivable to those skilled in the art.

[0007]

The non-foaming gel for shaving of the present invention is applied directly to the part of the skin to be shaved. There is no need to wet the skin in advance. This shaving gel moisturizes, softens and lubricates the skin and beard and allows for a good finish, comfort and smooth shaving. Since this shaving gel is not oily and contains no soap, it does not leave oil or stickiness on the skin after shaving. Therefore, there is no need to wash away the skin after shaving, and no soap, water or towel is needed. The polyhydric alcohol remaining on the skin after shaving is absorbed by the epidermis to smooth and moisturize the skin, thus alleviating the skin irritation and dryness normally caused by shaving. The shaving gel of the present invention may also be used as a skin lubricant prior to shaving with an electric razor, thus improving the finish and comfort of dry shaving. The foamed shaving gel of the present invention contains no chlorofluorocarbon or hydrocarbon jetting agents or blowing agents and is therefore less environmentally problematic than shaving foam. Furthermore, the non-foaming shaving gel of the present invention does not contain large amounts of volatile lower alkanols. Therefore, the gel is easy to manufacture and store, and it hardly causes a fire.

Claims (21)

[Claims] 1. A non-foaming shaving gel comprising 0.05 to 4.0% of carboxypolymethylene, 2.0 to 52.0% of polyhydric alcohol and 5% of silicon derivative, and pruritus. Agents up to 4%, one or more preservatives up to 1%, chelating agents up to 1%, neutralizers up to 8%, solubilizers up to 10%
, UV absorber up to 0.4%, fragrance up to 7%,
And the rest is composed of water. 2. The shaving gel according to claim 1, wherein the carboxypolymethylene is a carbomer. 3. The shaving gel of claim 2 containing 0.25% to 1.0% carbomer. 4. The shaving gel as claimed in claim 1, wherein the polyhydric alcohol is glycerin. 5. A shaving gel as claimed in the preceding claim, containing 10% to 20% of a polyhydric alcohol. 6. A shaving gel as claimed in the preceding claim, wherein the silicon derivative is a polymer of polyoxyethylene and / or polyoxypropylene side chains and dimethylsiloxane. 7. The shaving gel according to claim 6, wherein 0.5% to 2% of dimethicone copolyol is used as a silicon derivative.
Including. 8. The gel for shaving as claimed in the preceding claim, which contains menthol as an antipruritic agent. 9. A gel for shaving as claimed in the preceding claim, which comprises an antipruritic agent
% To 2% included. 10. A shaving gel as claimed in the preceding claim, containing 0.05% to 0.20% of methyl P-hydroxybenzoate as a preservative. 11. The shaving gel of the preceding claim, wherein at least 0.05% edetate disodium is used as a chelating agent.
Including. 12. The shaving gel according to the above claims, which contains hydrogenated castor oil as a solubilizing agent. 13. The shaving gel as described above, which contains an alkanolamine as a neutralizing agent. 14. The shaving gel as described above, which contains monoisopropylamine or triethanolamine as a neutralizing agent. 15. A shaving gel as claimed in the preceding claim, containing 0.10% to 5% of a neutralizing agent. 16. The shaving gel according to the above claims, which contains benzophenone-3 or benzophenone-4 as an ultraviolet absorber. 17. A shaving set including a container containing the gel of the preceding claim. 18. The shaving set according to claim 17, wherein the gel container is a small bag. 19. The shaving set according to claim 17 or 18, which comprises a disposable razor. 20. A method according to claim 17, claim 18 or claim 19.
Shaving set, including disposable towels. 21. A gel substantially corresponding to the shaving gel described in Examples 1 to 3.