JP2985019B2 - Oil-in-water emulsion cosmetic - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-in-water type emulsified cosmetic which exhibits smooth spreading and excellent feel upon application, has good stability over time, and has unprecedented physical properties.

[0002]

2. Description of the Related Art Oil-in-water emulsified cosmetics have excellent features such as having a light and smooth spread, and being able to impart a refreshing and moist feeling because the continuous phase is composed of an aqueous component. It has.

Conventionally, oil-in-water emulsion cosmetics have been incorporated with a water-soluble polymer such as a carboxyvinyl polymer, agar, or carrageenan as a thickener in order to improve the stability of the system.

[0004]

When a carboxyvinyl polymer is blended in a base, a refreshing and moist feel and an appropriate gel strength can be obtained, but the presence of an electrolyte in the base destroys the gel structure. As a result, there is a problem in stability with time due to a decrease in viscosity, so that it is difficult to mix the electrolyte. In the case of a base containing agar, it is difficult to uniformly spread it on the skin during use. In addition, in the case of a base containing carrageenan, a drainage phenomenon occurs in a high temperature state, so that there is a problem in stability over time, and it is difficult to uniformly spread the skin on the skin during use. Furthermore, these bases are ordinary emulsions or gels, and do not have specific physical properties in appearance.

Accordingly, an object of the present invention is to provide an oil-in-water type emulsified cosmetic having excellent spreadability on the skin and stability over time, and an oil-in-water type emulsified cosmetic having physical properties not found in conventional cosmetics. With the goal.

[0006]

Under these circumstances, the present inventors have conducted intensive studies in order to solve the above-mentioned problems. As a result, the present inventors have determined that a specific viscosity of xanthan gum and / or locust bean gum and iota carrageenan in a specific amount is blended. Of cosmetics that meet the above requirements,
The present invention has been completed.

That is, the present invention comprises the following (A) and (B): (A) 0.2 to 1.5% by weight of xanthan gum and / or locust bean gum; (B) 0.2 to 1.0% by weight of iota carrageenan; 5000 to 35000 cp when placed
An oil-in-water type emulsified cosmetic is provided.

The oil-in-water emulsified cosmetic composition of the present invention has a so-called thixotropic property, which is in the form of a gel having a high viscosity when left at rest, and becomes a fluid emulsion when the external force is applied. . Although there existed those having the thixotropic property also in the conventional cosmetics, the thixotropic property of the oil-in-water type emulsified cosmetic of the present invention is such that it has elasticity and a certain degree of fluidity (semi-fluidity) when allowed to stand. Is different from the conventional one.

The xanthan gum used in the present invention refers to Xanthomonas Campestris by a fermentation process in a pure medium.
Is a polysaccharide obtained by inoculating β-D-glucose
It has a structure in which two molecules of D-mannose and one molecule of sodium, potassium or calcium salt of D-glucuronic acid are bonded in a side chain to a main chain composed of 1,4 bonds, and has a molecular weight of 1,000,000 or more. It is. Specific examples include Celtrol (manufactured by Kelco Company).

[0010] The locust bean gum used in the present invention is a neutral polysaccharide obtained by purifying and powdering the endosperm portion in the seeds of the fruit of the carob tree, and is composed of galactose and mannose. Specific examples include Neosoft L (manufactured by Taiyo Kagaku).

The total amount of xanthan gum and locust bean gum in the oil-in-water emulsified cosmetic of the present invention is 0.2 to 1.5.
%, Preferably 0.3-0.8% by weight. The blending amount is 0.
If it is less than 2% by weight, there is a problem in stability with time at high temperatures, and if it exceeds 1.5% by weight, stickiness is felt at the time of application, and a refreshing and moist feel is impaired.

When xanthan gum and locust bean gum are used in combination, there is no particular limitation on the ratio, but it is preferable to add a large amount of xanthan gum because the thixotropic property becomes remarkable.

[0013] The iota carrageenan used in the present invention is a polysaccharide extracted from the red alga E. Spinosum, and comprises 3,6-anhydro-D-galactose-2-sulfate and
D-galactose-4-sulfate is α- (1 → 3) and β- (1
→ 4) Linear type with alternately repeating bonds, with molecular weight
It is about 100,000-1,000,000. Specific examples include Genibisco JJ (manufactured by Copenhagen Pectin Factory).

The amount of iota carrageenan in the oil-in-water emulsified cosmetic composition of the present invention is 0.2 to 1.0% by weight, preferably 0.1 to 1.0% by weight.
4 to 0.8% by weight. If it is less than 0.2% by weight, an elastic form cannot be obtained, and there is a problem in stability over time. 1.0% by weight
If it exceeds, an elastic form can be obtained, but it does not have fluidity even at the time of application and does not show smooth spreading.

In order for the oil-in-water emulsion cosmetic of the present invention to have favorable thixotropic properties, it is necessary that the viscosity of the system at rest is 5000 to 35000 cp at 25 ° C.

In the oil-in-water emulsion cosmetic of the present invention, in addition to the above essential components, components commonly used in cosmetics can be appropriately selected and blended as long as the effects of the present invention are not impaired. Such components include oils, surfactants, polyhydric alcohols, lower alcohols, water-soluble polymers, ultraviolet absorbers, antioxidants, preservatives, fragrances, pigments, cosmetic ingredients,
Water, organic and inorganic powders and the like can be mentioned.

The oil-in-water emulsified cosmetic of the present invention can be produced by a usual method, and is used as a basic cosmetic such as a cream, an emulsion or a serum, a makeup cosmetic such as a foundation, and a hair cosmetic. Can be widely applied.

[0018]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto. Example 1 Each base was prepared based on the formulation shown in Table 1, and evaluated according to the following criteria. (Manufacturing method) (A) No. 1 to No. 8 and No. 14 are heated and mixed at 70 ° C. (B) Heat No. 9-13 at 70 ° C. to dissolve and mix. (C) Add (B) to (A), stir at 70 ° C, and cool. (Evaluation criteria) Viscosity : Measured at 25 ° C using Bismetholone VG-DA (manufactured by Shibaura System Co., Ltd.). Storage stability : Storage stability at 50 ° C. for 1 week was evaluated by observing the appearance. ○ No change × Change (has a problem) Elasticity of the system : The appearance of the system at rest was observed, and the presence or absence of elasticity was judged by touching with a finger. System semi-fluidity : When the base was placed in a container and the container was tilted obliquely, it was judged whether or not the base flowed out of the bottle mouth. Good spreadability: A three-level sensory evaluation was conducted by a panel of 10 experts. Good 3 points Normal 2 points Bad 1 point The average score was 2.1 or more, and the average score was 2.0 or less.

[0019]

[Table 1]

As is evident from Table 1, the products of the present invention were all elastic systems, but had good spreadability at the time of application, excellent usability, and good stability over time. on the other hand,
None of the comparisons were satisfactory.

Example 2 Solubilized Essence (Clear) (Ingredient) (% by weight) 1. Glyceryl trioctanoate 0.2 2. Polyoxyethylene sorbitan monooleate (20E.O.) 1.0 3. Appropriate amount of fragrance 4. Ethanol 10.0 5. Glycerin 5.0 6. Sodium lactate 0.5 7. Propylene glycol 5.0 8. Iota carrageenan 0.8 9. Xanthan gum 0.2 10. Purified water balance (Production method) (A) No. 5 to 10 are heated and dissolved at 70 ° C. (B) After cooling (A) to room temperature, the mixtures of Nos. 1 to 4 are added, and the mixture is uniformly stirred to solubilize to obtain a serum. The obtained solubilized serum has both elasticity and semi-fluidity when left standing, becomes fluid when shaken when applied to the skin, and spreads smoothly on the skin with a refreshing and moist feel It has excellent feeling and stability over time.

Example 3 Emulsion type foundation (component) (% by weight) 1. Stearic acid 1.0 2. Cetostearyl alcohol 0.8 3. Polyoxyethylene sorbitan monooleate (20E.O.) 1.5 4. Liquid paraffin 20.0 5. Titanium oxide 9.0 6. Color pigment 2.0 7. Lecithin 0.3 8. Propylene glycol 10.0 9. Iota carrageenan 0.6 10. Xanthan gum 0.3 11. Flavor appropriate amount 12. Triethanolamine 1.0 13. Purified water Remaining amount (Production method) (A) No Heat and dissolve .1-4 at 70 ° C. (B) No. 5 to 13 are heated and dissolved at 70 ° C., and this is added to (A) and phase-inverted and emulsified. (C) Cool (B) to obtain an emulsified foundation. The resulting emulsified foundation has both elasticity and semi-fluidity when allowed to stand still, becomes fluid when shaken during application, spreads smoothly on the skin, has excellent usability, and has sedimentation of powder etc. No stability over time.

[0023]

The oil-in-water type emulsified cosmetic of the present invention has the following advantages. In addition, since it is in an elastic form at the time of standing, powders, capsules and the like to be blended can be stably maintained. (2) When an external force is applied at the time of application, the viscosity decreases, showing a smooth spread, and it is refreshing and moist and has an excellent usability. (3) A cosmetic having novel properties different from the thixotropic properties of conventional cosmetics in that it has elasticity and semi-fluidity in a standing state, and has an interesting appearance.

Claims (1)

(57) [Claims] (1) The following (A) and (B): (A) 0.2 to 1.5% by weight of xanthan gum and / or locust bean gum (B) 0.2 to 1.0% by weight of iota carrageenan Viscosity 5000 ~ 35000cp
An oil-in-water type emulsified cosmetic, characterized in that: