JPH10182341A - Pack cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a pack cosmetic, excellent in film strength and having quick-drying properties and good peelability. SOLUTION: This pack cosmetic comprises a pullulan ester of a fatty acid, preferably the one having 2-24C acyl groups and 0.0001-0.5 substitution degree with the acyl groups and 5,000-150,000 weight average molecular weight as a film-forming agent.

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 a fatty acid ester of pullulan as a film-forming agent, and more particularly to a pack cosmetic having excellent film strength, quick-drying and good peelability. .

[0002]

2. Description of the Related Art A paste containing a film-forming agent is applied to the skin for the purpose of removing dirt on the skin, adjusting texture, giving moisture, etc., and after drying, Peel-off type pack cosmetics that peel off a film are used. Currently, commercially available peel-off type pack cosmetics generally use polyvinyl alcohol, pullulan or the like as a film-forming agent, and blend a protective agent such as glycerin or propylene glycol.

[0003] A film forming agent such as polyvinyl alcohol and pullulan forms a high-strength film among various film forming agents, but requires a considerably long drying time of 20 minutes or more in order to peel it off firmly. To shorten the drying time,
It would be possible if polyvinyl alcohol, pullulan, etc. could be incorporated in the pack cosmetics at a high concentration, but there is a viscosity limit, and it is actually difficult to mix at a high concentration.

[0004] Accordingly, an object of the present invention is to provide a pack cosmetic having excellent film strength, quick-drying property and good peelability.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies, and as a result, the use of the fatty acid ester of pullulan as a film-forming agent for pack cosmetics enables high concentration and high film strength. The inventors have found that the above problems can be solved, and have completed the present invention. That is, the present invention provides a pack cosmetic comprising a fatty acid ester of pullulan as a film-forming agent.

Incidentally, regarding the application of the pullulan fatty acid ester to cosmetics, a patent utilizing the gelling ability of a pullulan fatty acid ester to a specific oil (Japanese Patent Application Laid-Open No. 53-1365)
No. 26, JP-A-53-136527), but there is no application to pack cosmetics. Further, there is no literature or patent publication relating to the fact that a film composed of an aqueous solution of pullulan fatty acid ester exhibits high strength.

[0007]

Embodiments of the present invention will be described below in detail.

The pullulan used as the raw material of the pullulan fatty acid ester used in the present invention is represented by the following general formula (I)

[0009]

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A linear polymer which is repeatedly bonded by α-1,6 bonds, which are different from the trimer, in units of maltotriose which is a trimer of glucose. It is. The molecular weight of pullulan is 5,000
0 to 10 million is preferred. Therefore, n in the general formula (I) is
Usually 10 to 20,000.

There is no particular limitation on the method for producing the raw material pullulan. For example, Aureobasidium pullulans, a kind of black yeast, can be cultured under appropriate conditions using sucrose and starch degradation products as carbon sources, and can be obtained as viscous polysaccharides produced in the culture solution. it can. The produced pullulan has slightly different physical properties depending on the kind of the strain used, but any of them can be used in the present invention. Further, the present invention includes a pullulan derivative modified by a reaction.

In the present invention, the pullulan fatty acid ester used as a film-forming agent is a compound represented by the general formula (II), and can be obtained by reacting pullulan with a fatty acid or a halide thereof (acylation reaction).

[0013]

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(In the formula, R ^{1 to} R ⁹ represent a hydrogen atom or an acyl group, and at least one is an acyl group.) In the above reaction (acylation reaction), the carboxyl group of the fatty acid is substituted with pullulan. The acyl group is introduced into the molecule of pullulan by reacting with the hydroxyl group directly bonded to the glucose ring and the hydroxyl group of the hydroxymethyl group bonded to the glucose ring.

The acyl group preferably has 2 to 24 carbon atoms. Such acyl groups include acetyl, propionyl, butyryl, isobutyryl, valeryl, pivaloyl, hexanoyl, heptanoyl,
Saturated aliphatic acyl groups such as octanoyl group, decanoyl group, lauroyl group, myristoyl group, palmitoyl group, stearoyl group, etc., lactoyl group, glycerolyl group, etc. And a saturated aliphatic acyl group containing a fluorine atom such as a group.

Among these, preferred acyl groups are a hexanoyl group, a heptanoyl group, an octanoyl group, a decanoyl group, a lauroyl group and a stearoyl group, and more preferably an octanoyl group. The pullulan fatty acid ester having an acyl group of 24 or less carbon atoms is suitable for the purpose of the present invention because it is easy to synthesize and is soluble in water.

In the pullulan fatty acid ester according to the present invention, the degree of substitution of the hydroxyl group of pullulan by an acyl group (D.
S.) is preferably in the range of 0.0001 to 0.5, more preferably 0.003 to
A range of 0.25, particularly 0.005 to 0.1 is preferred. DS is 0.00
When it is 01 or more, a high-strength film can be formed, and when DS is 0.5 or less, it is soluble in water and is suitable as a film agent.

Here, the degree of substitution (DS) is a value representing how many hydroxyl groups (3) per glucose ring have been substituted with acyl groups. For example, if all three are replaced, DS will be 1. The degree of substitution was calculated from ¹ H-NMR measurement of a 0.2 to 0.5% by weight solution of pullulan fatty acid ester in heavy dimethyl sulfoxide, and the proton integration ratio between the glucose ring of pullulan and the acyl group.

The weight average molecular weight of the pullulan fatty acid ester of the present invention is preferably 5,000 to 150,000, and 20,000 to 60,000.
Is more preferred. When the weight average molecular weight is 5,000 or more, a film having high film forming properties and high strength can be obtained.
The drying time can be shortened.

Further, the content of the pullulan fatty acid ester in the pack cosmetic of the present invention is preferably 5 to 50% by weight. 5
If it is at least% by weight, a film having an appropriate thickness can be formed and the releasability will be good. If the content is 50% by weight or less, an appropriate viscosity of the compound can be obtained, and the applicability becomes good.

In the pack cosmetic of the present invention, in addition to the film-forming agent, oils, humectants, activators, pigments, preservatives, bactericides, coloring materials, fragrances, organic solvents which are used in conventional pack cosmetics are included. (Ethanol), a medicinal agent and the like can be appropriately compounded within a range that does not impair the effects of the present invention.

The pullulan fatty acid ester used in the present invention, when used as an aqueous solution, has a lower viscosity than polyvinyl alcohol having the same molecular weight (for example, 20,000 to 40,000). Therefore, the composition has good elongation and can be uniformly and easily applied on the skin. In addition, due to the low viscosity, polyvinyl alcohol, which has been widely used in the past, has a high viscosity, and even in the concentration range where it is difficult to use,
The amount of the pullulan fatty acid ester can be increased, and as a result, the drying time as a pack can be considerably shortened. Although pullulan has a lower viscosity at the above molecular weight, it has to use a high molecular weight product (about 200,000) because the film strength is low at this molecular weight. In this case, the viscosity becomes high, which is not preferable.

[0023]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the invention thereto. The percentages in the examples are on a weight basis unless otherwise specified.

Examples 1 to 4 and Comparative Examples 1 to 4 Using the film-forming agents A to F shown in Table 1, peel-off type pack cosmetics having the composition shown in Table 2 were prepared by the following production method, and the performance was evaluated. (Releasability, quick-drying property and applicability) were evaluated by the following methods. Table 2 shows the results.

<Production method of pack cosmetics> Ingredients shown in Table 2
(2) to (10) are heated to 80 ° C. while stirring, and the component (11) previously heated to 80 ° C. is gradually added. Ingredient (1) in the solution
Was gradually added and completely dissolved, and cooled to room temperature to obtain a packed cosmetic.

<Performance Evaluation Method> The pack cosmetics were used by 10 specialized panelists and evaluated according to the following evaluation criteria. -Peelability (after drying for 20 minutes) ◎: Peel off neatly ○: Peel off at a quite satisfactory level △: Peel off very poorly ×: Peel off neatly ・ Quick-drying ◎: Peel off within 10 minutes ○: 10 Can be peeled off within ~ 20 minutes △: Can be peeled off within 20 to 30 minutes ×: Needs at least 30 minutes to peel off ・ Applicability ◎: Very good elongation and uniform and easy to apply ○: Good elongation and almost uniform Can be applied △: Elongation is not so good and uniform application is difficult ×: Elongation is difficult and uniform application cannot be performed (large application unevenness)

[0027]

[Table 1]

Note) * 1: After applying a 30% aqueous solution of a film forming agent on release paper,
After drying at room temperature for about 8 hours, a film having a thickness of 0.05 ± 0.01 mm was obtained. The film was conditioned at 23 ° C. × 55% RH for one day.
Orientec Co., Ltd. high-performance universal material testing machine (TEN
Using SILON UCT-100), the film strength was measured under the conditions of a load of 5 kg / cm ² and a crosshead speed of 50 mm / min.

* 2: The viscosity was measured at 25 ° C. in a 30% aqueous solution.

[0030]

[Table 2]

As is evident from Table 2, the pack cosmetic of the present invention is excellent in peelability, quick-drying and coatability.

Claims (3)

[Claims] A pack cosmetic comprising a fatty acid ester of pullulan as a film-forming agent. 2. The fatty acid ester of pullulan has an acyl group having 2 to 24 carbon atoms and a degree of substitution by the acyl group of 0.0001 to 0.5.
And a weight average molecular weight of 5,000 to 150,000.
Pack cosmetics as described. 3. The pack cosmetic according to claim 1, wherein the acyl group in the fatty acid ester of pullulan is a hexanoyl group, a heptanoyl group, an octanoyl group, a decanoyl group, a lauroyl group, or a stearoyl group.