JPH10298031A - Pearl gloss agent and cosmetic containing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pearl gloss gent that is stable with time and is useful in the production of cosmetics having pearl-like gloss without limitation in its formulation. SOLUTION: The objective gloss agent is obtained by using an ether of the formula: R<1> -O-R<2> (R<1> and R<2> are each a 16-36C hydrocarbon) such as dibehenyl ether as an active ingredient. When a variety of cosmetics are produced, this gloss agent can be used by admixing it to the objective cosmetic compositions, dissolving with heat, and cooling down the solution under stirring thereby precipitating fine sizes of crystals having pearl-like gloss. In another case, the gloss agent is heated and dissolved in an aqueous medium so that its concentration may become high and then cooled down under stirring to form a dispersion of fine flake crystals having pearl-like gloss and formulated to cosmetics. In preferred embodiments, the formulation of this ether to cosmetics is 0.1-20 wt.%, particularly 1-5 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pearlescent agent for imparting pearly luster to cosmetics and the like, and a cosmetic containing the same.

[0002]

2. Description of the Related Art Conventionally, in the cosmetics field, particularly products such as shampoos and rinses, a pearlescent agent has been blended mainly for the purpose of improving aesthetic appearance and imparting a sense of quality. Such pearl brighteners are roughly classified into inorganic pigments and organic solid fats, but both have the following disadvantages and are not always satisfactory. That is, mica and titanium-based pigments, which are typical inorganic pearl pigments, are excellent in gloss, but can be used only with a limited formulation in order to stably blend them because of their large specific gravity. In addition, there are problems such as lowering of the viscosity of the system and sedimentation during storage. On the other hand, higher fatty acid esters, which are widely used as organic pearling agents, also have the disadvantage of losing their pearl luster due to chemical stability, particularly pH changes. Not only are the surfactants and alkaline agents that can be used restricted, but there is also a problem with long-term storage stability.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pearlescent agent which is stable over time and does not limit the formulation.
And a cosmetic having a pearl luster containing the same.

[0004]

The present inventors have studied the pearl luster imparting properties of various compounds, and surprisingly, the ether represented by the following general formula (1) has excellent pearl luster imparting properties. And found that the pearl luster of cosmetics containing the same was stable over time, and completed the present invention.

That is, the present invention provides the following general formula (1)

[0006]

Embedded image R ¹ —O—R ² (1)

(Wherein, R ¹ and R ² are the same or different and each represent a hydrocarbon group having 16 to 36 carbon atoms).

Another object of the present invention is to provide a cosmetic having a pearly luster containing the ether represented by the general formula (1).

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The ether used as a pearl luster in the present invention is a compound known per se, but it was not known at all whether or not it has the ability to impart pearl luster to cosmetics and the like. . That is, cosmetics containing ether are disclosed in JP-A-63-122612, JP-A-48-5941 and JP-A-48-330.
No. 37, dialkyl ethers used in these are mostly liquid oils in which the alkyl group has a branched chain or a carbon number of 16 or less, and are rarely used as solid waxes.

As described above, the ether used in the present invention is an ether having two hydrocarbon groups having 16 to 36 carbon atoms (formula (1)).
A straight-chain or branched-chain alkyl or alkenyl group having 6 to 36 carbon atoms is mentioned, a straight-chain or branched-chain alkyl group having 16 to 36 carbon atoms is more preferable, and a straight-chain alkyl group having 16 to 36 carbon atoms is particularly preferable. Specific examples of the alkyl group include:
Examples include a hexadecyl group, an octadecyl group, an eicosyl group, a docosyl group, a tetracosyl group, and a triacontyl group. Among them, an octadecyl group (stearyl group) and a docosyl group (behenyl group) are particularly preferable. In the general formula (1), R ¹ and R ² may be the same or different.

Specific examples of the ether (1) used in the present invention include dioctadecyl ether, dibehenyl ether, hexadecyl docosyl ether, octadecyl docosyl ether, and octadecyl tricontyl ether.

The ether represented by the general formula (1) used in the present invention can be easily produced from the corresponding alcohol by a known method.

The ether (1) is solid at normal temperature, and is added to a desired cosmetic composition in a desired amount when various cosmetics are prepared, dissolved by heating, and then cooled while stirring. To precipitate fine crystals having pearl luster. On the other hand, a cosmetic is prepared by heating and dissolving with water as a medium to a high concentration, for example, 10 to 50% by weight, and then cooling with stirring to prepare a dispersion of flaky crystals having pearl luster. And the like.

The high-concentration dispersion of pearl brightener can be produced by employing a known crystallization method. For example, a pearlescent agent and a dispersion medium are mixed and heated to make a uniform liquid, or the dispersion medium is heated to a temperature equal to or higher than the melting point of the pearlescent agent, and then a pearlescent agent is added to make a uniform liquid, and then forced. This is a method of cooling down to room temperature by natural cooling or natural cooling to precipitate crystals.

Various additives such as pigments, pigments, antioxidants, ultraviolet absorbers, and fragrances can be added to the pearlescent agent of the present invention as long as the pearly luster is not impaired.

As described above, since ether (1) has pearly luster in various compositions, it can be blended for imparting pearly luster to various cosmetics. Such cosmetics are not particularly limited, and include, for example, packs, foundations, lipsticks, lotions, cold creams, hand creams, skin cleansers, lotions, serums, softening cosmetics, nutritional cosmetics, astringent cosmetics, whitening Skin cosmetics such as cosmetics, wrinkle improving cosmetics, anti-aging cosmetics, cleaning cosmetics, etc.
And hair cosmetics such as shampoos, rinses, treatments, hair styling agents, and hair tonics.

The amount of the ether (1) to be added to these cosmetics is 0.1 to 2 from the viewpoint of stably imparting pearl luster.
It is preferably 0% by weight, more preferably 0.5 to 10% by weight, particularly preferably 1 to 5% by weight. If it is less than 0.1% by weight, sufficient pearl luster cannot be obtained, and if it exceeds 20% by weight, the viscosity increases and the feel becomes heavy.

As described above, the cosmetic of the present invention is not particularly limited, but the ether (1), which is a pearl brightener, is excellent in chemical stability. Since the gloss is not impaired, the effect is particularly remarkable in cosmetics containing a surfactant (emulsified cosmetics and cosmetics intended for washing). That is, the conventional higher fatty acid ester pearl brightener may be hydrolyzed in a high pH region containing a surfactant, whereas the ether (1) of the present invention is stable in a wide pH range of 2 to 12. It is. Therefore, in the cosmetic of the present invention,
Any of anionic, cationic, amphoteric and nonionic surfactants can be blended.

Examples of such anionic surfactants include fatty acid salts, alkyl sulfates, polyoxyalkylene alkyl ether sulfates, sulfosuccinic surfactants, sulfosuccinamate surfactants, and polyoxyalkylene alkylamide ether sulfates. , Monoglyceride sulfate, olefin sulfonate, alkylbenzene sulfonate, alkane sulfonate, acylated isethionate, acylated amino acid, alkyl phosphate, polyoxyalkylene alkyl ether phosphate, polyoxyalkylene alkyl ether carboxylate Acid salts and the like.
Of these, lauryl sulfate, linear alkyl benzene sulfonate, polyoxyethylene lauryl ether sulfate, α-olefin sulfonate, polyoxyethylene sulfosuccinate and the like are particularly preferred.

Examples of the cationic surfactant include straight-chain or branched-chain mono- or di-long-chain alkyl quaternary ammonium salts and mono- or di-long-chain alkyl tertiary amines. Among them, stearyltrimethylammonium salt, cetyltrimethylammonium salt, benzyltrimethylammonium salt, dicetyldimethylammonium salt, dibenzyldimethylammonium salt and the like are particularly preferable.

Examples of the amphoteric surfactant include amide amino acid type, carbobetaine type, amidobetaine type, sulfobetaine type, amidosulfobetaine type, imidazolinium betaine type, amino acid type, phosphobetaine type and phosphate ester type. No. Of these, lauryl betaine,
Lauryl amide betaine, imidazolinium-based activators and the like are particularly preferred.

Examples of the nonionic surfactant include alkyl polyglucoside, sucrose fatty acid ester, polyglycerin fatty acid ester, polyoxyalkylene alkyl ether, alkylamine oxide, fatty acid polyhydric alcohol ester and the like. Among them, fatty acid glycerin ester, sorbitan fatty acid ester, sucrose fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan fatty acid ester, fatty acid glyceryl ether, polyoxyethylene alkyl ether, pluronic surfactant, lauryl dimethylamine oxide, etc. Is particularly preferred.

The amount of these surfactants varies depending on the purpose of blending, but is 1 to 80% by weight of the total cosmetic composition.
Is preferably, more preferably 5 to 40% by weight, and 10 to 3% by weight.
0% by weight is particularly preferred. When the amount of the surfactant is too small, the dispersibility of the pearlescent agent is reduced, and the surfactant is easily aggregated. Further, the mixing ratio of the ether (1) and the surfactant is preferably from 1: 1000 to 10: 1, more preferably from 1: 100 to 10: 1, and more preferably from 1:10 to 1:10, from the viewpoint of the pearl luster effect and the viscosity.
0 to 5: 1 is particularly preferred.

The cosmetic of the present invention may contain various conditioning ingredients for the purpose of imparting a conditioning effect to skin and hair. Examples of such conditioning components include higher alcohols, silicones, lanolin, squalene, hydrocarbons, protein derivatives, fatty acids such as fatty acid esters of polyethylene glycol and the like, cationized cellulose, cationized guar gum, and cationization such as Marcoat 550 (manufactured by Merck). Polymers.
Among them, silicones are particularly preferred. Examples of silicones include polyalkyl polysiloxanes represented by dimethyl polysiloxane, alkyl aryl polysiloxanes, alkyl polyether polysiloxanes, and alkylamino-modified polysiloxanes. The viscosity is not particularly limited, either, but is not limited to
cS is preferred.

The amount of the conditioning component, especially silicones, is preferably from 0.01 to 10% by weight, more preferably from 0.1 to 5% by weight.

In addition, the cosmetic of the present invention may optionally contain a pyridinethione salt as an antidandruff agent. Examples of the pyridinethione salt include, but are not particularly limited to, heavy metal salts of 1-hydroxy-2-pyridinethione (or pyridinium-1-thiol N-oxide), derivatives represented by magnesium salts, and aluminum salts. Among them, a zinc salt of 1-hydroxy-2-pyridinethione (or pyridinium-1-thiol N-oxide) is preferable. The amount of the pyridinethione salt is preferably from 0.1 to 10% by weight, particularly preferably from 0.5 to 5% by weight.

The cosmetics of the present invention further include ethanol, polyhydric alcohols, salts, oils, water, humectants, ultraviolet protective agents, chelating agents, pH regulators, preservatives, thickeners, pigments, fragrances, and active ingredients. And the like can be appropriately compounded within a range that does not impair the effects of the present invention. Of these, water is generally 0.1.
The content is 1 to 95% by weight, preferably 5 to 90% by weight, more preferably 10 to 80% by weight.

[0028]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

Example 1 Shampoo (wt%) Lauryl ether sulfate sodium salt (EO = 3) 15.0 Amidopropyl betaine laurate 3.0 Palm oil fatty acid diethanolamide 2.0 Distearyl ether 2.0 Water Balance 100. 0

A shampoo having the above formulation was produced by a conventional method. The resulting shampoo had a pearl luster and was excellent in detergency and conditioning effect. The pearl luster was maintained for a long time.

Example 2 Rinse-in shampoo (% by weight) Polyoxyethylene (20) lauryl ether 10.0 Amidopropyl betaine laurate 5.0 Trimethylstearyl ammonium chloride 2.0 Silicone emulsion (BY22-029, Dow Corning Toray) 3.0) Distearyl ether 3.0 Water balance 100.0

A rinse-in shampoo having the above formulation was produced by a conventional method. The resulting rinse-in shampoo had a pearl luster, was excellent in detergency and foaming properties, and had a high rinse effect. The pearl luster was maintained for a long time.

Example 3 Anti-dandruff shampoo (% by weight) lauryl ether sulfate triethanolamine 20.0 zinc pyrithione (25%) 4.0 coconut oil fatty acid diethanolamide 3.0 dimethylpolysiloxane 1.0 distearyl ether 3.0 Water balance 100.0

A shampoo having the above formulation was produced by a conventional method. The obtained shampoo had a pearly luster for a long period of time and had a dandruff removing effect.

Example 4 Body Shampoo (wt%) Polyoxyethylene (20) lauryl ether 15.0 lauroyl diethanolamide 3.0 decanoic acid monoglyceride 2.0 sodium laurate 2.0 sodium myristate 1.5 dibehenyl ether 2.0 water balance 100.0

A body shampoo having the above formulation was produced by a conventional method. The obtained body shampoo had a long-lasting pearly luster and was excellent in detergency, foaming properties and rinsing properties.

Example 5 Cleansing Charge (Gel) (% by Weight) (1) Polyoxyethylene (20) Octyldodecyl ether 15.0 (2) Glycerin 10.0 (3) Sorbitol 10.0 (4) Tri-2 -Ethylhexanoic acid glyceride 15.0 (5) Liquid paraffin (K-230) 5.0 (6) Dibehenyl ether 4.0 (7) Water Balance 100.0

According to the above formula, (1) to (6) are
Heat to 80 ° C, dissolve and mix, cool to 50 ° C,
Prepared by adding (7) under stirring. The resulting cleansing agent had a pearly luster for a long period of time and was excellent in cleaning properties against makeup stains.

Example 6 Facial Cleanser (% by Weight) Emanone 1112 (manufactured by Kao Corporation) 10.0 Potassium laurate 5.0 Potassium myristate 3.0 Potassium palmitate 1.0 Stearic acid 1.0 Glycerin 15.0 Sorbitol 5.0 Lauric acid diethanolamide 2.0 Distearyl ether 3.0 Water Balance 100.0

A face wash having the above formulation was produced by a conventional method.
The obtained facial cleanser had a long-lasting pearl luster, was excellent in detergency, and was excellent in skin care for skin.

Example 7 Emulsion Oil phase component: (% by weight) Stearyl behenyl ether 5.0 Batyl alcohol 1.0 Sorbitan trioleate 1.0 POE (40) Sorbitan monooleate 1.0 Ethyl paraben 0.1 Aqueous phase Ingredients: Methylparaben 0.1 Ethanol 3.0 Glycerin 2.0 Fragrance 0.1 Purified water Balance 100.0

According to the above formulation, the oil phase components were mixed, dissolved by heating, and kept at 70 ° C. The water phase component was similarly heated and mixed at 70 ° C., and the oil phase was added thereto and emulsified by an emulsifier. The emulsion was gradually cooled to obtain an emulsion. The resulting emulsion had a long-lasting pearly luster and was excellent in skin care effect.

[0043]

The pearl brightener of the present invention has excellent pearl-like luster and stability, and when added to shampoos, rinses, lotions, etc., can give excellent luster to products. In addition, it is possible to easily obtain a cosmetic that can maintain pearl luster stably for a long period of time.

Claims (5)

[Claims] (1) R ¹ -OR ² (1) (wherein R ¹ and R ² are the same or different and have 16 or more carbon atoms)
A pearl brightener comprising an ether represented by the formula: 2. A compound represented by the general formula (1): R ¹ -OR ² (1) wherein R ¹ and R ² are the same or different and each have 16 to 16 carbon atoms.
And a pearly luster containing an ether represented by the formula: 3. The cosmetic according to claim 2, further comprising a surfactant. 4. The cosmetic according to claim 2, further comprising a silicone. 5. The cosmetic according to claim 2, further comprising a pyridinethione salt.