JP2618998B2 - Shaving cream composition and preparation method thereof - Google Patents

Description

The present invention relates to novel shaving cream formulations and their preparation. More particularly, the present invention relates to a soapless, detergent-free shaving cream formulation incorporating as essential ingredients a salt of a fatty acid ester of lactylic acid, a saturated monoglyceride, a propylene glycol monoester and a humectant.

[Conventional technology]

Unwanted hair from the human epidermis (here, "hair"
Hair, beard, and other hair)
This is usually done by shaving with a razor. A variety of soaps, creams and oils are useful to facilitate the shaving process and reduce the skin discomfort experienced by razor action. Shaving cream is a preparation of choice that facilitates the act of shaving and reduces scratches, irritation, and local discomfort associated with hair removal by shaving. The shaving cream produces froth by the action of a brush or from an aerosol container. Both are usually formulated with soaps and / or detergents as foam formers, the latter shaving creams or brushless shaving creams being cream-type oil-in-water emulsions.

Shaving creams are foam-forming soap-based formulations that are usually further modified for application with a shaving brush or as a soap and / or detergent foam from an aerosol dispenser. Such a formulation should provide easy and rapid foam formation. The foam should be resistant to collapse while present on the face. There should be softening of the hair to keep it upright. The foam should provide adequate lubrication to the razor blade and minimize skin irritation. Certain soaps can readily provide rapid foam formation, and experience has shown that soaps derived from coconut oil provide strong foam. Thus, conventional shaving cream formulations usually contain such a soap and / or detergent mixture that satisfies the foam quality requirements of the shaving cream formed. Unfortunately, the incorporation of such soaps and / or detergents has made the shaving cream formulation significantly basic at pH 8-10. The normal pH of human skin is in the range of pH 4.5, the so-called "acid mantle" of the skin, and the application of highly alkaline shaving preparations is often irritating to the skin. Soap-based and / or detergent shaving cream formulations readily produce the required consistency froth,
Their intrinsic alkalinity is a serious problem that contributes to trauma to the skin during the shaving process.

[Problems to be solved by the invention]

As mentioned above, it is evident that the requirements of a preferred shaving cream, which on the one hand has good whipping properties but is formulated from non-irritating chemicals, present a considerable problem for a person skilled in the art.

The present invention provides a shaving cream formulation that can be easily lathered with rich shaving froth, is not irritating to the skin, is non-toxic, and has other desirable shaving properties as described above. .

Furthermore, the present invention provides a soap-free, detergent-free, non-irritating shaving cream formulation ideally distributed and applied as an aerosol foam, yet prepared from safe, non-toxic and economical ingredients. is there.

[Means for solving the problem]

According to the invention: (a) 0.2 to 20 parts by weight of at least one salt of a fatty acid ester of lactylic acid; (b) at least one straight chain fatty acid having 8 to 22 carbon atoms and an iodine value of 0 to 20. Saturated monoglycerides 1.
2 to 56 parts by weight, (c) 0.8 to 48 parts by weight of at least one saturated monoester of propylene glycol with a linear fatty acid having 8 to 22 carbon atoms and an iodine value of 0 to 20, (d) poly 1 to 90 parts by weight of a hydroxylated humectant, (e) 0 to 25 parts by weight of an unsaturated monoglyceride of at least one straight-chain fatty acid having 8 to 22 carbon atoms and an iodine value of 30 to 110, and (f) There is provided a shaving cream formulation comprising 0-95 parts by weight of water.

The consistency of the shaving cream formulation can range from a pasty substance to a viscous injectable liquid that may require the addition of water.

Preferably, the shaving cream formulation contains at least some of the unsaturated monoglycerides described in (e) above, to provide the formulation with enhanced lubricity. It is also preferred that the formulations contain an amount of water which gives them a preferred consistency. However, depending on the form of the formulation at the time of packaging, water can be omitted and added at the time of use, or the amount of water can be adjusted to give the product the desired form.

The following formulation is a preferred embodiment of the present invention relating to a shaving cream that is tailored for application to the human body prior to shaving, in particular from an aerosol.

(A) 0.4 to 1.5 parts by weight of at least one salt of a fatty acid ester of lactylic acid; (b) at least one saturated monoglyceride 1 of a straight-chain fatty acid having 8 to 22 carbon atoms and an iodine value of 0 to 20. .
40 to 4.50 parts by weight, (c) 2.0 to 6.2 parts by weight of at least one saturated monoester of propylene glycol with a linear fatty acid having 8 to 22 carbon atoms and an iodine value of 0 to 20, (d) poly 2 to 10 parts by weight of a hydroxylated humectant, (e) 1 to 4 parts by weight of an unsaturated monoglyceride of at least one straight-chain fatty acid having 8 to 22 carbon atoms and an iodine value of 60 to 110, and (f) Water 74-93 parts by weight Salts of fatty acid esters of lactylic acid used in the present invention are known in the art and are commercially available. They are,
U.S. Patent No. 2,733, incorporated herein by reference.
It can be prepared by reacting lactylic acid with an acid by a known ordinary condensation method as disclosed in JP-A-252.
Examples of such salts are fatty acid esters (where the fatty acids are 14-22
Alkali metal salts, alkaline earth metal salts, ammonium salts, especially the sodium, potassium and calcium salts. Such fatty acids include palmitic acid, stearic acid, oleic acid and the like. Particularly, sodium stearoyl-2-lactylate and calcium stearoyl-2-lactylate are preferred.

The saturated monoglycerides useful in the present invention have an iodine value of 0-20. Preferred saturated monoglycerides are 0
Includes those having an iodine value of ~ 5, and those made by transesterification of glycerin with fully saturated fats or oils such as tallow, coconut oil, cottonseed oil, soybean oil, peanut oil, sesame oil and the like. These monoglycerides are usually at least
Contains 90% by weight of monoester. Such monoglycerides also have from 8 to 22 carbon atoms and have
It can be prepared by reacting glycerin with a linear fatty acid, such as found in vegetable oils and animal fats, saturated to an iodine value of 5. Such monoglycerides are, for example, Myverol (trade names) 18-00, 18-04, 18-06 and 18-07 distilled monoglycerides [Eastma Chemicals Products, Inc.
n Chemicals Products, Inc.).

Methods for preparing high-purity monoglycerides useful in the present invention are described in U.S. Pat.Nos. 2,634,234, 2,634,278 and
No. 2,634,279, which are incorporated herein by reference.

The propylene glycol monoester should be a 1,2-propylene glycol monoester,
It should have an iodine value of 20, preferably 0-5.
The monoester is advantageously purified by molecular distillation after the usual preparation. While stearic acid is the preferred fatty acid group of the above esters, other fatty acid groups derived from fully hydrogenated oils and fats, which contain high concentrations of stearic acid after hydrogenation, are also useful. Unsaturated fatty acid groups are unsuitable. Examples of fats and oils from which the propylene glycol monoester can be derived are soybean oil, cottonseed oil, lard, and tallow. The hydrogenation of the fatty acid group can be performed before or after the production of the propylene glycol monoester. Their main fat component after hydrogenation is stearic acid.

Unsaturated monoglycerides of the present invention include sunflower oil, beef tallow, coconut oil, cottonseed oil, soybean oil, peanut oil and the like,
Includes distilled monoester products made by transesterification of fats and oils with glycerin. Such distilled monoester products usually contain a concentration of monoester of at least 90% by weight. Also, such monoglycerides have from 8 to 22 carbon atoms and from 30 to 120, preferably
It can be prepared by reacting glycerin with a linear fatty acid, such as found in vegetable oils and animal fats, saturated to provide an iodine value of 0 to 110. Such monoglycerides are, for example, Maybelol 18-50, 18-8
It is commercially available as 5 and 18-92 distilled monoglycerides (a product of Eastman Chemical Products).

The shaving cream formulation of the present invention comprises at least one polyhydroxylated humectant, preferably 2-10
It is essential to contain it in a concentration of parts by weight. Typically, humectants such as propylene glycol, diethylene glycol, glycerin and the like can be used. Glycerin is particularly preferred.

The amount of water present in the shaving cream formulation of the present invention depends on whether a concentrated or ready-to-use shaving cream composition is to be prepared. Concentrates are usually 30 or more, depending on the desired product consistency
It contains less than 74 parts by weight, whereas ready-to-use shaving creams usually contain 74 to 94 parts by weight, preferably 85 to 90 parts by weight. Preferably, the water is distilled or deionized water.

Any of the shaving cream formulations of the present invention may be prepared using conventional techniques and equipment. Heating may be required during any stage of the preparation.
The preferred proportions of all ingredients, including water, are mixed in a laboratory or industrial mixer suitable for mixing creams and the like. Following mixing, the cream is packaged for distribution. When dispensing is carried out using aerosol cans, the usual propellants, especially methane, ethane, isobutane, butane,
It has been found that both hydrocarbons, such as propane and pentane, and low molecular weight fluorinated hydrocarbons can be used.

In preparing the preferred compositions of the present invention, a) a salt of a fatty acid ester of lactylic acid, b) a saturated monoglyceride, and c) a propylene glycol monoester need to be melt-blended and then used prior to use in the formulation. It is preferable to pulverize to Such powder blends are commercially available as Myvatex, Texture Lite, a food emulsifier (a product of Eastman Chemical Products). If an unsaturated monoglyceride is used, it can be dissolved or melt-blended with glycerin by heating it to a temperature of 100-120 ° F (38-49 ° C) with glycerin before adding to other ingredients to avoid gelling Is done. This is especially important when water is present as a component. Water is preferably added to the mixture of a), b) and c), and then the mixture of humectant and unsaturated monoglyceride is stirred and mixed therewith. In some preparations of other formulations, a), b) and c) are melt blended with humectants and unsaturated monoglycerides (if used). The shaving cream formulation can then be prepared by the addition of hot water.

A convenient and unique feature of the present invention is that the formulation can be adapted to a process for preparing a concentrated form. Concentrated formulations can be prepared by simply mixing the above components in conventional equipment. Typically, 1.7 to 4.5 parts by weight of an alkali metal salt of a fatty acid ester of lactylic acid, saturated monoglycerides 5.2 to 13.
9 parts by weight, propylene glycol monoester 7.2-19.2
Parts by weight, 8.0-21.6 parts by weight of polyhydroxylated humectant,
Unsaturated monoglyceride 4.0 to 10.8 parts by weight and water 30 or more 74
Concentrated formulations containing less than 10 parts by weight can be conveniently used as raw material formulations, which are further diluted with an appropriate amount of water to prepare the shaving cream product of the present invention for further packaging, distribution and action. I can do it. This feature of the present invention significantly contributes to the ease of manufacture of the final formulation, thereby improving the cost of the entire manufacturing process.

Shaving creams prepared according to the invention are:
Produces a rich, creamy, non-irritating foam when applied to the skin prior to shaving and used. The pH of this cream is between 4.5 and 5.5, which is substantially the same as the skin's natural pH. This shaving cream is a formulation that has excellent lather, wetting and lubricating properties, is more compatible with the user's essential chemical properties of the skin and is therefore significantly less irritating than ordinary shaving creams I will provide a.

〔Example〕

 Hereinafter, the present invention will be further described with reference to examples.

Example 1-Preparation of a shaving cream concentrate The following ingredients were weighed into a conventional mixer. 3.23 parts by weight of sodium salt of stearoyl-2-lactylic acid,
Powder containing 9.95 parts by weight of saturated monoglyceride, 13.72 parts by weight of propylene glycol monoester and 50 parts by weight of water; 15.4 parts by weight of glycerin, and Maybelol 18-92
A melt blend of 7.7 parts by weight of monoglyceride (an unsaturated sunflower oil monoglyceride having an iodine value of 110, manufactured by Eastman Chemical Products).

The components are heated and mixed to produce a homogeneous blend. If desired, perfumes, preservatives, coloring agents and the like known to those skilled in the art may be added.

A shaving cream concentrate having a paste-like consistency is prepared in the same manner as in Example 1 according to the following formulation.

Example 1 = 50% water concentrate 2 = anhydrous concentrate 3 = anhydrous concentrate using unsaturated monoglyceride 4 = 40% water concentrate 5 = pumpable viscous liquid A-stearyl lactyl Sodium salt of acid B-saturated monoglyceride C-propylene glycol monoester D-unsaturated monoglyceride The formulations of Examples 1 to 5 are mixed with water in the range of 2.5 to 19 parts by weight of water per part by weight of the formulation when used. Is done. These are all effective as shaving cream formulations,
Abundant froth can lather easily and is not irritating to the skin. Formulations without unsaturated monoglycerides do not have the lubricating properties of formulations with unsaturated monoglycerides.

Example 6-Preparation of a shaving cream product
er) (Model N-50). 0.84 parts by weight of sodium salt of stearoyl-2-lactylic acid, 2.59 parts by weight of saturated monoglyceride, 3.57 parts of propylene glycol monoester
Parts by weight of powder and 87 parts of water; melt blend of 2 parts by weight of unsaturated monoglyceride and 4 parts by weight of glycerin. The ingredients are mixed by heating until a homogeneous blend is obtained.
Flavors and / or preservatives may optionally be added. This finished cream may be used as prepared,
Alternatively, they may be packaged in aerosol cans using conventional propellants.

Tests of the shaving quality of this shaving cream have shown that the cream has good lubricating properties, does not rub the skin and leaves the skin feeling comfortable and smooth.

A light foamy consistency shaving cream formulation for use is prepared in a manner similar to that described in Example 6, according to the following formulation.

If it is desired to use the shaving cream formulation as an aerosol, the following concentrates are preferred. Parts excluding the component propellant (a) a metal salt of a fatty acid ester of lactylic acid 0.70 to 1.0 (b) saturated monoglyceride 2.25~ 3.0 (c) Propylene glycol monoester 3 ~ 4 (d) humectants 3 ~ 5 (e A) Unsaturated monoglycerides 1.5 to 2.5 (f) Water 89.55 to 84.5 Aerosol formulations can be prepared using conventional techniques known in the art. For example, the components are pressurized into a container with a conventional propellant using a conventional discharge nozzle. Tests have shown that this aerosol formulation has all of the desired properties of the shaving cream described herein.

If parts by weight are used, it is intended to be based on the total weight of the salt of the fatty acid ester of lactylic acid, the saturated monoglyceride, the propylene glycol monoester, the humectant, and the unsaturated monoglyceride and water (if used). Is done.

As used herein, the iodine value is “Official and
Tentative Methods of the American Oil Chemists So
ciety ", 2nd edition (including additions and revisions from 1947 to 1963)," AOCS Official Method CD1-25 (revised April 1956) ".

Although the invention has been described in detail with particular reference to preferred embodiments thereof, it is understood that variations and modifications can be effected within the spirit and scope of the invention.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Howard Kenneth Hobbs United States, Tennessee 37660, Kingsport, Eastleigh Street 308

Claims (3)

(57) [Claims] (A) 0.2 to 20 parts by weight of at least one salt of a fatty acid ester of lactylic acid; (b) at least one of linear fatty acids having 8 to 22 carbon atoms and an iodine value of 0 to 20. A kind of saturated monoglyceride 1.2
(C) 0.8 to 48 parts by weight of at least one propylene glycol monoester of a saturated linear fatty acid having 8 to 22 carbon atoms and an iodine value of 0 to 20; (d) polyhydroxylated moisturizer 1 to 90 parts by weight of an agent; (e) 0 to 25 parts by weight of at least one unsaturated monoglyceride of a linear fatty acid having 8 to 22 carbon atoms and an iodine value of 30 to 110; A shaving cream composition comprising 95 parts by weight. (A) 0.4 to 1.50 parts by weight of at least one salt of a fatty acid ester of lactylic acid; (b) at least one of linear fatty acids having 8 to 22 carbon atoms and an iodine value of 0 to 20. A kind of saturated monoglyceride 1.40
(C) 2.0 to 6.2 parts by weight of at least one propylene glycol monoester of a saturated linear fatty acid having 8 to 22 carbon atoms and an iodine value of 0 to 20; (d) polyhydroxylated moisturizer 2 to 10 parts by weight of an agent; (e) 1 to 4 parts by weight of at least one unsaturated monoglyceride of a linear fatty acid having 8 to 22 carbon atoms and an iodine value of 60 to 110; A shaving cream composition comprising 93 parts by weight. 3. A salt of a fatty acid ester of lactylic acid (a).
2 to 20 parts by weight, 1.2 to 56 parts by weight of saturated monoglyceride and 0.8 to 48 parts by weight of saturated propylene glycol monoester are melt-blended;
Mixing with parts by weight (the above parts by weight are based on the total weight of the composition obtained).