JPS6212707A - Water-containing cosmetic composition blended with capsule - Google Patents

Abstract

PURPOSE:The titled composition suppressing reduction in beautifying effects resulting from oxidation and deterioration of water-soluble ascorbic acid, obtained by dispersing powder comprising a water-soluble ascorbic acid as an essential component into an oil, packing the dispersion into water-resistant capsules and blending a water-containing cosmetic with the capsules. CONSTITUTION:Powder comprising a water-soluble ascorbic acid such as l- ascorbic acid and/or its water-soluble salt, especially sodium salt, as an essential component, is dispersed into an oil such as liquid paraffin, purified olive oil, purified mink oil, etc., to give a composition, which is packed into water- resistant capsules (preferably capsules having the longest outer diameter of 5mm and the shortest outer diameter of 0.5mm, each capsule existing independently, preferably spherical or elliptic capsules having about 1-3mm outer diameter). A water-containing cosmetic such as toilet lotion, milky lotion, cream, face cleaning cream, pack, etc., is blended with the capsules, to give the titled composition capable of keeping beautifying effects for a long time without causing oxidation and deterioration of water-soluble ascorbic acids.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to a water-containing cosmetic composition containing capsules, and its purpose is to provide a water-containing cosmetic composition containing capsules containing a whitening agent, particularly water-soluble ascorbic acids. However, the object of the present invention is to provide a water-containing cosmetic composition containing capsules that can exhibit a whitening effect without causing oxidative deterioration of water-soluble ascorbic acids.

(Prior Art and Its Disadvantages) Generally, as a whitening agent, ascorbic acid, kojic acid, derivatives thereof, hydroquinone, etc. are used in cosmetics, ointments, etc. for the treatment or prevention of dark skin, age spots, freckles, sunburn, etc. It has been known for a long time to incorporate.

In particular, alkobic acid and its derivatives are highly safe and effective for the skin.

However, alkobic acid and its salts are water-soluble;
In addition, if it is added to cosmetics containing water, it will be oxidized in a relatively short period of time due to its highly oxidizable properties, causing it to lose its effectiveness as a whitening agent, or even worse. The problem was that the sushi was colored brown, making it impractical.

As a countermeasure against oxidative deterioration of ascorbic acids,
a) Lt': JY7 acid, etc.') Z>M containing 3-7
It has also been proposed that liposomes formed from a lamellar phase composed of synthetic lipids be dispersed in water and that this dispersion is blended into cosmetics. Although some improvements were recognized, some felt that it was not enough.

On the other hand, ascorbic acid phosphate magnesium salt, which is a derivative of ascarpic acids, has oxidative stability.
There are reports that if cosmetics containing this derivative are used, the alkobic acid will separate on the skin and be effective, but this derivative has many side reactions during synthesis, low yield, and complicated manufacturing steps. The product is expensive and has not yet been widely used.

Furthermore, it has also been proposed and used to esterify alkobic acid to produce and use derivatives such as ascorbyl stearate, ascorbyl palmitate, and ascorbyl civalmitate, but these are esters of fatty acids with relatively large molecular weights. Therefore, it is expensive even though the concentration of ascorbic acid moiety per unit weight is low, and its stability over time is not perfect.

(Solution Means) This invention was made in order to solve the various drawbacks of ascorbic acids used as conventional skin whitening agents. Specifically, this invention contains water-soluble ascorbic acids as an essential ingredient in a water-resistant capsule. This capsule-containing water-containing cosmetic composition is characterized in that it is filled with a composition in which ascorbic acids are dispersed in oil, and the capsules are blended therein. Another object of the present invention is to provide an aqueous gold cosmetic composition containing water-resistant capsules in which the ascorbic acids are not degraded by oxidation.

(Structure of the invention) An embodiment of the present invention will be described in detail below.

Examples of water-soluble ascorbic acids that can be used in the present invention include water-soluble salts of l-ascorbic acid and/or β-ascorbic acid, and among these water-soluble salts of l-ascorbic acid, sodium l-ascorbate, l-
Preferred examples include potassium ascorbate, and among these! - Sodium ascorbate is listed in the Cosmetic Ingredients Standards, so it can be exemplified as one that can be particularly preferably used.

In this invention, the amount of ascorbine @ and its salt to be used and the amount of mixing thereof in a water-containing cosmetic composition are determined according to the state in which the water-containing cosmetic composition according to the present invention is used, that is, in a capsule in a water-containing cosmetic composition. Required hydrogen ion concentration (pH) when destroyed and its contents mixed into a water-containing cosmetic composition
It is desirable to determine the pH by 6.
- With l-ascorbic acids (acidic) so that it is about 8! - It is preferable to set the mixing ratio of the ascorbic acid salt (alkaline) and the amount used in the entire mixture.

In this invention, a composition in which the water-soluble ascorbic acid powder is dispersed in oil is used. The reason for using this oil-dispersed composition is to avoid contact between the water-soluble ascorbic acids and water and air to prevent oxidation. Furthermore, this is because it facilitates the production of seamless capsules, and in addition, this oil can be used as a cosmetic fatliquoring agent when used in a water-containing cosmetic composition.

In this invention, mineral oil, animal and vegetable oil 1 synthetic ester, silicone oil, etc. can be suitably used as oils, but they must be liquid at least at room temperature. All expensive oils are not preferred for use in the present invention because of the oxidative nature of water-soluble ascorbic acids.

Examples of oils that can be used in this invention include liquid paraffin and refined olive oil.

Examples include refined mink oil, squalane, oleyl oleate, etc., but the present invention is not limited to these oils.

In this invention, the formulation of the oil-dispersed composition of water-soluble ascorbic acids to be filled into water-resistant capsules includes powders such as titanium oxide, talc, sugar, starch, etc. as diluents for water-soluble ascorbic acids, and capsules that are broken. When mixed, the contents are good for the entire cosmetic (indicator to determine whether or not they have been mixed) -- pigments, dyes, etc.
Further examples include surfactants that aid in the dispersibility of water-soluble ascoric acids in powders or in water-containing cosmetic compositions.

In this invention, the above-mentioned oil dispersion composition is encapsulated, but it is desirable that the capsules be destroyed by external force such as crushing immediately before use of the cosmetic. Therefore, if the capsules are too small, they will be difficult to destroy, and if they are too large, they will contain water. The uniformity of blending into the cosmetic composition is lost, which is undesirable in either case.

Therefore, usually the longest outer diameter is 5mm, the shortest outer diameter is 0.5mm+
It is preferable that each capsule is independent, and more preferably a spherical or elliptical capsule with an outer diameter of about 1 mm to 3 mm.

Therefore, the outer diameter of 0.5 mm, which is commonly used in cosmetic compositions, is
The following so-called microcapsules or similar products thereof are not preferred in this invention.

The reason is that such microcapsules usually have an outer diameter of 0.
5 mm or less, and the destruction of the capsule is caused by contact with water, etc., so it takes a long time for the contents inside the capsule to come out, and a strong force is required to destroy it with external force. This is because neither condition meets the purpose of the water-containing cosmetic composition of the present invention.

In this invention, as the material of the capsule coating to be used, it is preferable to use substances that are toxic or harmful to the human body or its skin, or substances whose safety has not been proven (therefore, they are water resistant and cannot be crushed by relatively small external forces such as crushing). The material is not particularly limited as long as it satisfies the conditions of being destructible, safe for the human body, and relatively easy to manufacture; for example, it may be inorganic or organic (among these, gelatin is the most preferred material).

However, since gelatin has the disadvantage of not being water resistant, a hardening agent that imparts water resistance may be used, or a water resistant coating may be layered on top of the gelatin coating to create a double structure that imparts water resistance. You may.

However, while formalin is useful as a hardening agent for gelatin, its use in this invention is undesirable due to its toxicity.

Regarding the latter double-structure coating that imparts water resistance,
The applicant has already disclosed this as "Water-resistant Capsule and Method for Manufacturing the Same" (filed on June 5, 1985).

In this invention, in order to impart water resistance to capsules made of non-water resistant materials such as gelatin, this already proposed method can of course be adopted. This is a coating method.

Although this method is well applied to the embodiments of the present invention, it is of course not limited to this method.

In this invention, the water-containing cosmetic composition containing the water-resistant capsule filled with the oil fraction composition of water-soluble ascorbic acids may be any lotion, milky lotion, cream, facial cleansing cream, pack, ointment, etc. , so-called cosmetics,
All suitable examples include quasi-drugs and pharmaceuticals.

In this invention, among such water-containing cosmetic compositions, in the case of lotions, milky lotions, and creams, it is necessary to remove the capsule film that has been destroyed before use, but in the case of facial cleansing creams and packs, it is necessary to remove the capsule film before use. It is not necessary and can be listed as specific examples that can be particularly preferably used.

In this invention, the water-containing cosmetic containing water-resistant capsules filled with a composition containing water-soluble ascorbic acids in an oil fraction must contain sufficient water to quickly dissolve the water-soluble ascorbic acids released from the capsules. .

Therefore, it is preferable that the water content is 20% or more by weight.

(Effects of the Invention) As detailed above, the capsule-containing water-containing cosmetic composition according to the present invention is a water-resistant capsule filled with a composition in which a powder containing water-soluble ascorbic acids as an essential component is dispersed in oil. Since this capsule-containing water-containing cosmetic composition is characterized in that it contains this capsule, even if the water-containing cosmetic composition contains water-soluble ascorbic acids, the ascorbic acids are subject to oxidation degradation. Without a problem,
It has the effect of effectively retaining the whitening effect of ascorbic acids for a long time.

Examples of the present invention will be given below to make the effects of the present invention clearer.

(Example 1)! - 60 g of liquid paraffin was added to a mixture of pulverized and mixed 10 g of ascorbic acid, 10 g of 1-ascorbic acid sodium salt, and a trace amount of a water-soluble tar-based red dye, and the mixture was thoroughly mixed in a colloid mill to prepare a dispersion.

This dispersion was wrapped in a gelatin film and molded into a spherical soft capsule with a diameter of 2 mm.

Natural rubber latex was applied to the capsule to a thickness of about 0.2 mm, and immediately placed in a coagulating solution consisting of 95% ethyl alcohol, 85%, and dimethylpolysiloxane, 15%, to solidify the latex into rubber.

The alcohol content of the capsules was dried and used as a raw material for water-resistant capsules.

The contents of some of these capsules were taken out and the ascorbic acid concentration was determined by Vfr (Cosmetic Raw Materials Standards Law) and the concentration was 18.2%.

(Example 2) Water-containing pack agent (peel-off type) with the following formulation: Polyvinyl alcohol 15% Carboxymethyl alcohol 5% Glycerin 2% 95% Ethanol 10% POE cetyl ether 1% Fragrance
Trace amount of preservative Trace amount of water-resistant capsule (Example 1) 2% Purified water Balance (approximately 65%) Total
When manufacturing 100% water-resistant capsules, all other ingredients were mixed together and finally mixed at room temperature.

Before use, about 7 g of the pack prepared in this manner was placed in a container, and the capsules were crushed and mixed well with the fingertips, so that the red pigment in the capsules was uniformly mixed throughout.

In this state, water-soluble ascorbic acids were also completely dissolved in the aqueous phase.

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, l'h(Dt14iijI, :”l:S L
.

After 25 minutes, it dried and was peeled off.
1.7 The usability was good.

(Test Example 1) □ Check the content of the water-resistant capsule in the above pack.
The changes in the 1-scorbic acid content over time were investigated and the results are shown in Table 1 below.

Table 1 1 Content (%) 1 Residual rate (%) Before adding to 11 packs 1 18.2 1 100 1 month after adding 11 1 16.6 1 91 3 months after adding 11 1 15.8 1 86 1 As is clear from the above results, the oxidation stability of the ascorbic acids in the capsules blended into the water-containing cosmetic composition is found to be good, and the water-containing cosmetic composition containing capsules according to the present invention has excellent effects. I understand that.

Claims (1)

[Claims] (1) A water-containing cosmetic composition containing a capsule, characterized in that a water-resistant capsule is filled with a composition in which a powder containing water-soluble ascorbic acids as an essential ingredient is dispersed in oil, and the capsule is blended therein. .