JPH03227907A - Skin cosmetic base - Google Patents

Abstract

PURPOSE:To provide a skin cosmetic base excellent in storage stability and sensory characteristics such as smell, comprising, as the essential ingredients, a L-ascorbic phosphoric ester magnesium salt, organic acid having carboxyl and hydroxyl groups equal in number or its salt and water. CONSTITUTION:The objective skin cosmetic base comprising (A) 1-5wt.% of a L-ascorbic phosphoric ester magnesium salt, (B) 0.5-3.0wt.% of an organic acid having carboxyl and hydroxyl groups equal in number (e.g. tartaric acid, lactic acid, glycolic acid) or its salt and (C) water. Combination of the components A and B will prevent the change of the properties of the aqueous solution of the component A with time (precipitation, discoloration, smell degradation). The present cosmetic base can also be incorporated, where appropriate, with pigment, perfume, preservative, surfactant, ultraviolet light absorber, etc., being used as face lotion, milky lotion, cream, pack, etc.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides an organic acid having a carboxyl group to hydroxyl group ratio of 1 or a salt thereof to an aqueous L-ascorbic acid phosphate magnesium salt solution. The present invention relates to skin cosmetics with excellent storage stability (precipitate, appearance) and sensory characteristics (odor).

[Prior art and problems to be solved by the invention] L-ascorbic acid phosphate ester magnesium salt is water-soluble and when absorbed transdermally, it is hydrolyzed in vivo by enzymes such as phosphatase to liberate L-ascorbic acid and form Hikmin. It shows C activity.

As a result, L-ascorbic acid phosphate ester magnesium salt is frequently incorporated into skin cosmetics.

However, it has been pointed out that an aqueous solution of L-ascorbic acid phosphate magnesium salt has a problem in that a precipitate is generated or discolored over time, and its transdermal absorbability is reduced.

As a solution to this problem, for example, JP-A-61-1302
No. 05 discloses a stabilized aqueous composition that does not cause precipitation or discoloration by blending an ascorbic acid derivative with a dicarboxylic acid having 6 to 10 carbon atoms.

However, although the dicarboxylic acid having 6 to 10 carbon atoms used in JP-A-61-130205 is soluble in alcohol and liquid oil, its solubility in water is not necessarily good and it is difficult to incorporate it into an aqueous system, especially at low temperatures. Crystals precipitate.

In addition, JP-A No. 62-63597 discloses that by blending an organic carboxylic acid or its salt into an aqueous solution of ascorbic acid phosphate magnesium salt, the aqueous solution is prevented from oozing. Or its salts include sodium succinate, sodium fumarate, sodium citrate, sodium pyridonecarboxylate, sodium edetate, glycyrrhizic acid, ammonium glycyrrhizinate, potassium glycyrrhizinate, etc., but their effects are not sufficient. .

Furthermore, JP-A No. 63-243014 discloses a skin cosmetic containing magnesium salt of L-ascorbic acid-2-phosphate, a nonionic surfactant, and an electrolyte, but the electrolyte therein is also a salt of citric and succinic acid. are giving. However, the stability (precipitation, discoloration) of L-ascorbic acid-2-phosphate magnesium salt is not sufficient.

[Means to solve the problem]

The present invention has been made through extensive research in view of the above-mentioned problems.The present invention has been made based on an aqueous solution of L-ascorbic acid phosphate magnesium salt. The present invention has been completed by discovering that by using the salt in combination, it is possible to prevent changes over time (formation of precipitates, discoloration, and odor) of an aqueous solution of L-ascorbic acid phosphate magnesium salt.

That is, the present invention provides a magnesium salt of L-ascorbic acid phosphate, in which the ratio of the number of carboxyl groups to hydroxyl groups is 1.
A skin cosmetic containing an organic acid or a salt thereof and water as essential ingredients.

Organic acids having a carboxyl group to hydroxyl group number ratio of 1 include tartaric acid, lactic acid, glycolic acid, etc., and their potassium salts, strium salts, calcium salts, etc., and one or more of these may be used in the present invention. is used. Further, the above-mentioned organic acids include optically active forms and racemized forms thereof.

The amount of monoascorchic acid phosphate magnesium salt used in the present invention is preferably in the range of 0.1 to 10% by weight, particularly preferably 1 to 5% by weight, based on the total amount of the cosmetic. If O is less than 1% by weight, no cosmetic effect can be expected, and if it is more than 10% by weight, the solubility is poor and may cause precipitation.

The amount of the organic acid having a carboxyl group to hydroxyl group ratio of 1 used in the present invention is preferably 0.1 to 5.0% by weight, particularly preferably 0.5% by weight, based on the total amount of the skin cosmetic. -3.0% by weight.

Furthermore, a combination of two or more is also within the above range.

If it is less than 0.1% by weight, changes over time of the L-ascorbic acid phosphate magnesium salt aqueous solution cannot be sufficiently prevented;
If it exceeds 5.0% by weight, the sensory properties of the skin cosmetic will deteriorate and skin irritation will tend to occur.

In addition to the above-mentioned essential ingredients, the skin cosmetics of the present invention may optionally include pigments, fragrances, preservatives, surfactants, ultraviolet absorbers,
Antioxidants, humectants, polymers, metal ion sequestering agents, etc. can be appropriately incorporated within the range that achieves the object of the present invention.

The skin cosmetics of the present invention include lotions, milky lotions, cream punctures,
Applicable to essence etc.

〔Example〕

Examples will be described below.

= 5 The unit of compounding amount shown in the examples means weight %.

Storage stability test (precipitate appearance) investigated in Examples,
The test method for the sensory characteristic test (odor) is as follows.

(1) Storage stability test (precipitate) Each sample was left at room temperature of 40°C for 6 months, and the presence or absence of precipitate was visually examined by three specialized inspectors. The evaluation criteria were in three stages as follows.

1. There is no precipitate (good) 2. There is a slight precipitate (slightly poor) 3. There is a precipitate (poor) (Appearance) Three specialized inspectors visually inspected the appearance of the above sample, that is, the degree of coloration. I investigated. The evaluation criteria were in three stages as follows.

1. No discoloration or slight discoloration (good) 2. Slight yellow discoloration (slightly good) 3. Discoloration to brown (poor) (2) Sensory characteristics test (odor) Odor when the sample is applied were examined by three specialized inspectors and comprehensively evaluated. The evaluation criteria were in three stages as follows.

1. There is almost no odor (good) 2. There is a slight smell (slightly good) 3. There is an odor (poor) Examples 1 to 7. Comparative Example 1 A skin cosmetic was prepared using the formulation (% by weight) shown in Table 1.

Certain organic acid salts with a ratio of carboxyl groups to hydroxyl groups of 1 include lactate (sodium, potassium, calcium).
was used.

Ingredients 1 to 5 in the table were dissolved in 6 to prepare a skin cosmetic, and its properties are also shown in Table 1.

As can be seen from Table 1, the skin cosmetic of the example contains sodium lactate, potassium lactate, calcium lactate, and water in which the ratio of the number of carboxyl groups to hydroxyl groups is 1 in L-ascorbic acid phosphate magnesium salt according to the present invention. had excellent storage stability (precipitate appearance) and sensory characteristics (odor).

On the other hand, lacks lactate Comparative example ■ The storage stability of skin cosmetics Examples 8-15. Comparative examples 2 to 4 Skin cosmetics were prepared according to the formulations (% by weight) listed in Table 2.

One or more specific organic acids and salts thereof having a carboxyl group to hydroxyl group ratio of 1 were used.

Components 1 to 11 in the table are dissolved in 14, then component 12.1
A skin cosmetic was prepared by adding a solution of No. 3, and its properties are also shown in Table 2.

As can be seen from Table 2, according to the present invention, I, -ascorbic acid phosphate magnesium salt contains one or more tartaric acid, tartrate, or gelcholate having a ratio of carboxyl groups to hydroxyl groups of 1, and water. The skin cosmetics of Examples 6 to 15 were excellent in both storage stability and sensory properties.

On the other hand, citrate (carboxyl group: hydroxyl group -3
:l), cm! -malate (2:1) succinate (2:1)
: All of Comparative Examples 2 to 4 in which O) was used in place of tartaric acid or tartrate had a storage stability of 0. [Effects of the Invention] As described above, the skin cosmetic of the present invention can be administered orally to L-ascorbic acid phosphate. It is clear that it has excellent storage stability with no precipitation or discoloration of magnesium salts, and has excellent sensory characteristics with no or little change in odor.

■

Claims (1)

[Claims] L-ascorbic acid phosphate ester magnesium salt,
A skin cosmetic comprising an organic acid or a salt thereof having a ratio of carboxyl groups to hydroxyl groups of 1, and water as essential ingredients.