JPH05345712A - Pack cosmetic - Google Patents

Abstract

PURPOSE:To provide a pack cosmetic having high affinity to skin and high moisture retention taking advantage of the film-forming property of chitosan. CONSTITUTION:The pack cosmetic having excellent moisture-retention, film- forming property and peelability, free from stimulation and capable of forming a chitosan film having high affinity to skin and increased film strength is produced by compounding a film-forming agent consisting of (A) an acid salt of chitosan or a water-soluble chitosan derivative selected from carboxylated compound, sulfonated compound, glycolated compound or quaternized compound of chitosan and (B) a water-soluble nonionic polymer compound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pack cosmetic containing chitosan as a film-forming agent, which has a refreshing feel without stickiness, exhibits high moisturizing properties, and can give a moist feeling to the skin. Moreover, it provides a highly safe product.

[0002]

2. Description of the Related Art Conventionally, pack cosmetics have been used for the purpose of promoting blood circulation in the skin, promoting percutaneous absorption of an active ingredient, and cleaning the skin. As a pack cosmetic, it forms a film when dried in a jelly form, and is a peel-off type of peel-off type, adsorbable powder is mixed, and when used, it is a powder pack used by adding water or emulsion to make a paste, and then rinsed after packing. Examples include washing packs of the type. Among them, the peel-off type, which can maximize the effects of the above-mentioned pack cosmetics and is easy to pack, is widely used.

Such peel-off type pack cosmetics are mainly composed of a film-forming polymer compound such as polyvinyl alcohol, polyvinylpyrrolidone, vinyl acetate, carboxymethylcellulose, etc., and a moisturizing agent such as propylene glycol or glycerin is added thereto. And then water,
It was made into a jelly by dissolving it in a solvent such as ethanol.

[0004]

The conventional pack cosmetics as described above, particularly the peel-off type, have a poor affinity for the skin of the formed film, or when the film is too strong to be peeled off. There were drawbacks such as pain and irritation to the skin.

Further, recently, chitin and chitosan have been attracting attention and are being used as polymer compounds having high biocompatibility and having film-forming property and moisturizing property. However, chitin is not soluble in water and is difficult to apply to peel-off type pack cosmetics. Further, chitosan shows water solubility when used as an acid salt and is easier to handle than chitin, but there is a problem that the film formed after drying is weak in strength.

[0006]

[Means for Solving the Problems] Despite the existence of the above problems, in peel off packs, in order to form a film having a high affinity for the skin and improve the irritation to the skin, a film of chitosan is used. Is considered to be very effective. Furthermore, the fact that the chitosan film itself has excellent moisturizing properties is also useful for peel-off packs. Therefore, we diligently studied to apply chitosan to a peel-off type pack cosmetic. As a result, the chitosan film can be strengthened by using it together with the nonionic water-soluble polymer compound, and the chitosan was successfully used in the peel-off pack cosmetics.

That is, a water-soluble derivative selected from an acid salt of chitosan, a carboxylated compound, a sulfonated compound, a glycolated compound, and a quaternized compound is used as a film-forming agent. By adding a water-soluble polymer compound, the strength of the chitosan film was enhanced. As the nonionic water-soluble polymer compound, one or more of hydroxyethyl cellulose, hydroxypropyl cellulose, dextran, pullulan, curdlan, pectin, guar gum, locust bean gum, polyvinyl alcohol and polyvinylpyrrolidone are preferable. Here, the nonionic water-soluble polymer compound is used because when an ionic polymer having a charge is blended, an ionic complex is formed with a water-soluble derivative such as an acid salt or carboxylate of chitosan. However, it becomes insoluble and inconvenient to handle.

[0008]

As described above, in the present invention, an acid salt or water-soluble derivative of chitosan and a nonionic water-soluble polymer compound are used together as a film-forming agent. It is preferable that 20% by weight or more of the film-forming component used is an acid salt or a water-soluble derivative of chitosan. This makes it possible to replace a considerable amount of the conventional film-forming agent with the biocompatible chitosan derivative, and improve the affinity of the film for the skin.

When the pack cosmetic according to the present invention is applied to the skin, a transparent and smooth film is formed on the skin. This film has an appropriate strength and can be smoothly peeled off without giving a sensation to the skin when peeled from the skin after drying.
Further, since chitosan itself has a high moisturizing property, the film containing chitosan exhibits a good moisturizing effect on the skin. Therefore, the pack cosmetic according to the present invention gives a good moisturizing feeling during and after use. Further, it is possible to further mix a moisturizing component such as sodium hyaluronate or sodium pyrrolidonecarboxylate, but since the chitosan film itself has a moisturizing property, it is possible to reduce the compounding amount thereof, and it is refreshing without giving tackiness. It is possible to give a feeling of use.

[0010]

EXAMPLES Further, the present invention will be described in detail with reference to Examples. Example 1 is a jelly-like peel-off type pack cosmetic, and Example 2 is a paste-like peel-off type pack cosmetic. These formulations are shown in Tables 1 and 2.

[Table 1]

[Table 2]

In Example 1, (4), (5) and (6) were dissolved in (9) in Table 1 and (2) moistened with a part of (1) and (3) was added. It is prepared by adding and mixing with stirring, heating and dissolving at 70 ° C., and then cooling, and adding (7) and (8) to the rest of (3) at 50 ° C. and further cooling. . Here, in Table 1,
Comparative Example 1 was prepared by substituting polyvinyl alcohol for the carboxylated chitosan of (1).

In Example 2, (5) was dissolved in (11) in Table 2,
After (6) and (7) were added and mixed, (1), (2) and a part of (8) were moistened, and (3) was added and dissolved by heating at 70 ° C and then cooled, (8)
(9) and (10) are dissolved in the rest of the mixture and added at 50 ° C., and (4) is added and kneaded. Here, in Table 2, (1)
Comparative Example 2 was prepared by substituting the glycolated chitosan of Example 1 for the acetic acid resin emulsion.

When both Example 1 and Example 2 were applied to the skin, a film having excellent transparency, smooth touch, and good releasability was formed.

[0014]

In order to show the effect of the present invention, the sensory evaluation of the feeling of use and the effect of the above-mentioned Examples was carried out in comparison with Comparative Examples. For sensory evaluation, each sample of Examples and Comparative Examples was blindly used by 30 female panelists aged 20 to 50, and a moist feeling, film-forming property, irritation feeling during use,
With respect to the ease of peeling, and the moist feeling, refreshing feeling, and stimulating feeling after use, the evaluation was performed according to the evaluation criteria shown in Table 3.
The results are shown in Table 4 as the average value of the scores of 30 people.

[Table 3]

[Table 4]

As is clear from Table 4, in each of the examples, the moist feeling, the sensation of irritation, the feeling of irritation after use and the feeling of refreshing after use were better than those of the comparative examples. With respect to the film-forming property, the example obtained the same degree of evaluation as the comparative example, while the peeling easiness gave a better evaluation than the comparative example.

As described above, according to the present invention, it is possible to provide a pack cosmetic having a high affinity to the skin, an excellent moisturizing property, and a refreshing feeling without stickiness. Further, in this pack cosmetic, there was no irritation during and after use, the film was easily peeled off, and the safety and usability were excellent.

Claims (2)

[Claims] 1. A film-forming agent comprising an acid salt of chitosan or at least one water-soluble derivative selected from carboxylated, sulfonated, glycolated and quaternized chitosan and a nonionic water-soluble polymer compound. Pack cosmetics made by blending as. 2. The nonionic water-soluble polymer compound is one or more selected from hydroxyethyl cellulose, hydroxypropyl cellulose, dextran, pullulan, curdlan, pectin, guar gum, locust bean gum, polyvinyl alcohol and polyvinylpyrrolidone. The pack cosmetic according to claim 1, which is present.