JPH10203923A - Pack cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject cosmetic containing polyethylene glycol having a specific weight-average mol.wt. and polyvinyl alcohol, short in drying time, and good in stability with time. SOLUTION: This pack cosmetic comprises (A) 2-7wt.% of polyethylene glycol having a weight-average mol.wt. of 1,300-1,600, (B) 7-20wt.% of a partial saponification type polyvinyl alcohol preferably having a viscosity of 30-50cPs, and, if necessary, (C) a lower alcohol (e.g. ethanol), an oil (e.g. 1,3-butanediol), powder (e.g. talc), a water-soluble polymer (e.g. polyvinyl pyrrolidone), an anionic surfactant, an amphoteric surfactant, a nonionic surfactant, an antiseptic agent, a sterilizer, a UV absorbent, a chelating agent, a perfume, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pack cosmetic. More specifically, the present invention relates to a pack cosmetic having a short drying time after pack application and good stability over time.

[0002]

2. Description of the Related Art Pack cosmetics are widely used to moisturize and cleanse the skin. There are several types of cosmetics such as a peel-off type, a wiping or rinsing type, and a patch type depending on the method of use.

[0003] Among them, the peel-off type, which is used by peeling off a film formed by applying it to the skin and drying it,
It is excellent in removing dirt on the skin surface, old keratin, darkening of pores, keratotic plugs, and the like, and has a high satisfaction in use.

[0004]

However, the drawback of the peel-off type pack cosmetic is that the standing time (drying time) after application is long, and usually 30 times for one use.
This takes about a minute, and this is an obstacle to using the pack cosmetics in daily busy life.

[0005] For this reason, some devices have been devised to shorten the drying time. For example, the drying time is shortened by increasing the alcohol content in the formulation, but in this case, a problem such as irritation to the skin or eyes occurs due to the increased alcohol concentration. In addition, a large amount of powder or the like is blended in order to reduce the amount of water in the formulation, or a substance that interacts with a film agent to form a gel to promote the formation of a film when dried is added to dry time. However, in any of these cases, there is a problem in stability such that the product is gelled over time during storage of the product and the product itself becomes hard. Thus, it was difficult to obtain a peel-off type cosmetic pack having a short drying time and no problem in stability.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned situation, the present inventors have conducted intensive studies to shorten the drying time of a pack cosmetic and to obtain a pack cosmetic having excellent stability over time. As a result, it has been found that when a combination of polyethylene glycol having a specific average molecular weight and polyvinyl alcohol is blended, a pack cosmetic excellent in both drying time and stability is obtained, and the present invention has been completed.

[0007] An object of the present invention is to provide a peel-off type cosmetic pack having a short drying time and excellent stability over time.

[0008]

That is, the present invention provides a pack cosmetic comprising polyethylene glycol having a weight average molecular weight of 1300 to 1600 and polyvinyl alcohol.

In the present invention, the content of the polyethylene glycol is 2 to 7% by weight, and the content of the polyvinyl alcohol is 7 to 20% by weight. Is provided.

Further, the present invention provides a pack cosmetic comprising polyethylene glycol 1540 and polyvinyl alcohol.

In the present invention, the content of the polyethylene glycol is 2 to 7% by weight, and the content of the polyvinyl alcohol is 7 to 20% by weight. Offer a fee.

Hereinafter, the configuration of the present invention will be described in detail. The polyethylene glycol used in the present invention is a polymer of ethylene oxide, and produces various products having different properties depending on the degree of polymerization. Therefore, polyethylene glycol 200 and polyethylene glycol 300 are distinguished from each other based on the difference in their average molecular weights. "Table 1" shows the names described in official documents such as the standard of cosmetic raw materials and their weight average molecular weights.

[Table 1] ---------------------------------------------- -------------------------- Name Average molecular weight --------------------- -------------------------------------------------- -Polyethylene glycol 200 190-210 polyethylene glycol 300 285-315 polyethylene glycol 400 380-420 polyethylene glycol 600 570-630 polyethylene glycol 1000 950-1050 polyethylene glycol 1500 * 500-600 polyethylene glycol 1540 1300-1600 polyethylene glycol 4000 3000-3700 Polyethylene glycol 6000 6000-7500 -------------------------------------------- ---------------------------- * Equivalent mixture of polyethylene glycol 300 and polyethylene glycol 1540 (Reference) A. Lourenco: Compt. Rend., 49, 619 (1959)

The polyethylene glycol used in the present invention is a polyethylene glycol having a weight average molecular weight in the range of 1300 to 1600 and called polyethylene glycol 1540.

Polyethylene glycol 1500, which is widely used for cosmetics and pharmaceuticals, is a mixture of equal amounts of polyethylene glycol 300 and polyethylene glycol 1540, and contains polyethylene glycol 1540. Included in the scope of the invention.

The amount of the polyethylene glycol is preferably in the range of 2 to 7% by weight based on the total amount of the cosmetic pack. If the amount is less than 2%, a sufficient effect of shortening the drying time cannot be obtained. If the amount exceeds 7%, the stability of the preparation may be deteriorated such as gelation at a low temperature.

The polyvinyl alcohol used in the present invention is
Products classified into several grades depending on the degree of polymerization and the degree of saponification are commercially available. The degree of polymerization is usually indicated by measuring the viscosity of a 4% strength aqueous solution at 20 ° C. In the present invention, those having a low viscosity of about 4 cps to those having a high viscosity of about 70 cps can be used. However, as the degree of polymerization increases, the strength of the film to be formed tends to increase, and the viscosity of the pack tends to increase. It is preferable to use polyvinyl alcohol having a degree of polymerization.

On the other hand, The degree of saponification is due to the difference in the rate of saponification of the acetyl group of polyvinyl acetate during the production of polyvinyl alcohol, and is almost completely (98 to 10).
(0%) saponified “completely saponified type” and partially (87-89%) saponified “partially saponified type” in which some acetyl groups are left. In the present invention, any of the saponified types can be used, but the partially saponified type has higher solubility at room temperature and better viscosity stability at low temperature, and therefore uses partially saponified type polyvinyl alcohol. More preferred.

The amount of the polyvinyl alcohol is preferably in the range of 7 to 20% by weight based on the total amount of the pack cosmetic. When the amount is less than 7% by weight, a film having sufficient strength is not formed, and the viscosity at the time of applying the pack is low, so that a satisfactory feeling of use as a pack cannot be obtained. In some cases, the viscosity is too high, making it difficult to apply.

In the pack cosmetic of the present invention, in addition to the above essential components, if necessary, components generally incorporated into cosmetics can be blended and manufactured by a conventional method. Examples of components that can be blended include lower alcohols such as ethanol and isopropyl alcohol, glycerin, propylene glycol, dipropylene glycol, and 1,3-
Polyhydric alcohols such as butanediol, sorbitol and maltitol, liquid paraffin, higher alcohols, ester oils, oils such as methylpolysiloxane, talc, kaolin, titanium oxide, powders such as silicic anhydride, polyvinylpyrrolidone, polyvinyl acetate, Carboxymethylcellulose, water-soluble polymers such as xanthan gum, anionic surfactants, amphoteric surfactants, nonionic surfactants, preservatives, bactericides, ultraviolet absorbers, chelating agents, antioxidants,
Perfumes and the like.

[0020]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. In addition, the compounding quantity in an Example is a weight%.

The drying time and stability of the pack cosmetic of the present invention produced in the examples were evaluated by the following evaluation methods.

[Measurement of Drying Time] The drying time of the pack cosmetics was measured by sensory evaluation of each panel actually used by 10 female panels. The measurement was performed in a room at a constant temperature and humidity of 25 ° C. and 40% RH. Each panel applies the sample evenly to the face, and when the applied pack becomes sticky and peels off as a single film even if touched with a finger, it is judged as dry and it is applied and then dried Was recorded in minutes. The average of the data of 10 panelists was used as the drying time.

[Viscosity Stability Test] The stability of the pack cosmetic was tested particularly for the stability of viscosity at low temperatures.
When the pack is stored at low temperature for a long period of time, gelation tends to occur and the viscosity tends to increase. As an accelerated test of gelation at a low temperature, a sample was left at −20 ° C. for 3 days, completely frozen, returned to a room temperature at a moderate speed, and a process of repeating this operation twice was performed. The viscosity before and after this low-temperature treatment was measured at 30 ° C., and the rate of increase in viscosity was calculated based on the following equation. The stability was evaluated based on the following criteria. Viscosity increase rate (%) = (V1−V0) / V0 × 100 V0: viscosity before low-temperature treatment V1: viscosity after low-temperature treatment “Evaluation of stability” ○: good viscosity stability Viscosity increase rate less than 150% Δ: viscosity Normal stability Viscosity increase rate less than 200% ×: Poor viscosity stability Viscosity increase rate 200% or more

Pack cosmetics having the composition shown in Tables 2 and 3 were produced, and the drying time was measured and the viscosity stability was tested as described above.

[Table 2] ---------------------------------------------- -------------------------- Comparative Example Example Comparative Example Component name 1 2 3 1 4 5 6 --------- -------------------------------------------------- ------------- Polyethylene glycol 400 5%------Polyethylene glycol 600-5------Polyethylene glycol 1000--5----Polyethylene glycol 1540--- 5---Polyethylene glycol 4000----5--Polyethylene glycol 6000-----5-Polyethylene glycol 11000------5 Polyvinyl alcohol 13 13 13 13 13 13 13 (Polymerization degree 40 cps, saponification degree (88%) Ethanol 10 10 10 10 10 10 10 1,3-butylene glycol 2 2 2 2 2 2 2 Preservatives qs qq qq qq qq qs qq Purified water Residue Residue Residue Residue Residue Residue -------- -------------------------------------------------- -------------- Drying time( 24.2 24.1 22.0 16.4 12.0 10.5 10.2 Viscosity stability ○ ○ ○ ○ × × × -------------------------------- ----------------------------------------

As is clear from Table 2, the polyethylene glycol 1540 of Example 1 (weight average molecular weight 13
00-1600) and polyvinyl alcohol, the pack cosmetic of the present invention has a short drying time and excellent viscosity stability. When the weight average molecular weight of the polyethylene glycol is smaller than 1300 (Comparative Examples 1 to 3), the drying time is long. On the other hand, when the weight average molecular weight of the polyethylene glycol is larger than 1600 (Comparative Examples 4 to 6), the viscosity stability is poor. In any case, satisfactory results cannot be obtained.

[0026]

[Table 3] ---------------------------------------------- -------------------------- Comparative example Example ------ -------------- -------------------------- Component name 7 2 3 4 5 6 7 --------------- -------------------------------------------------- ------- Polyethylene glycol 1540-1 2 3 5 7 10 Polyvinyl alcohol 13 13 13 13 13 13 13 (Polymerization degree 40 cps, saponification degree 88%) Ethanol 10 10 10 10 10 10 10 1,3-butylene glycol 10 9 8 7 5 3-Preservatives proper amount proper amount proper amount proper amount proper amount proper amount proper amount purified water residue residue residue residue residue residue residue residue residue ------------------------- ----------------------------------------------- Drying time( Min) 24.0 21.1 18.0 17.5 16.0 14.5 12.2 Viscosity stability ○ ○ ○ ○ ○ ○ △ ------------------------------- -----------------------------------------

In the experiment shown in Table 3, the amount of 1,3-butylene glycol was adjusted to measure the drying time in order to equalize the amounts of ethanol, a volatile component, and purified water. . According to the results in Table 3, when the blending amount of polyethylene glycol 1540 (weight average molecular weight is from 1300 to 1600) is less than 2% by weight, the effect of shortening the drying time is not sufficient, and on the other hand, it exceeds 7% by weight. In this case, the viscosity stability is slightly deteriorated, so that the blending amount of polyethylene glycol is more preferably between 2 and 7% by weight.

[0028]

[Table 4] ---------------------------------------------- -------------------------- Example ---------------------- -------------------------- Component name 8 9 10 11 12 13 14 --------------- -------------------------------------------------- ------- Polyethylene glycol 1540 5 5 5 5 5 5 5 Polyvinyl alcohol 5 7 10 13 16 20 24 (degree of polymerization 40 cps, degree of saponification 88%) Ethanol 10 10 10 10 10 10 10 1,3-butylene glycol 2 2 2 2 2 2 2 Preservatives Appropriate amount Appropriate amount Appropriate amount Appropriate amount Appropriate amount Appropriate amount Purified water Residual Residual Residual Residual Residual Residual ------------------------- ----------------------------------------------- Drying time( Min) 18.0 17.2 16.9 16.4 16.0 15.5 14.0 Viscosity stability ○ ○ ○ ○ ○ ○ ○ Viscosity (cps, 30 ℃) 200 1,000 4,000 25,000 45,000 73,000 * * 110,000 --------------- -------------------------------------------------- -------

From the results shown in Table 4, when the blending amount of polyvinyl alcohol is less than 7% by weight (Example 8), a satisfactory feeling in use as a pack cannot be obtained due to low viscosity. On the other hand, when it exceeds 20% by weight (Example 1
4) Because the viscosity is so high that it is difficult to apply uniformly,
More preferably, the blending amount of polyvinyl alcohol is 7 to 20% by weight.

Example 15 A peel-off mask having the following composition was prepared. [Prescription] (1) Polyvinyl alcohol (degree of polymerization: 40 cps, degree of saponification: 88%) 15% by weight (2) Carboxymethyl cellulose 2 (3) 1,3-butylene glycol 2 (4) Polyethylene glycol 1405 5 (5) Citric acid 0.1 (6) Sodium citrate 0.3 (7) Ethanol 10 (8) Polyoxyethylene (16) 2-octyl decyl ether 1 (9) Preservatives qs (10) Flavor qs (11) Purified water residue [Production method] (11) After adding (1) to (6), heat and stir at 80 ° C to dissolve. A solution obtained by dissolving (8) to (10) in (7) is added, mixed and cooled. The result was that the average drying time was as short as 16 minutes and the viscosity stability was good.

Example 16 A peel-off mask having the following composition was prepared. [Prescription] (1) Polyvinyl alcohol (degree of polymerization: 40 cps, degree of saponification: 88%) 10% by weight (2) Polyvinyl acetate emulsion (resin content: 50%) 15 (3) Glycerin 2 (4) Polyethylene glycol 1405 5 (7) Ethanol 10 (8) Polyoxyethylene (20) sorbitan monostearate 1 (9) Squalane 2 (10) Preservatives Appropriate amount (11) Perfume Appropriate amount (12) Purified water Residue [Preparation method] According to Example 15. The result was that the average drying time was as short as 16 minutes and the viscosity stability was good.

Example 17 A peel-off mask having the following composition was prepared. [Prescription] (1) Polyvinyl alcohol (degree of polymerization 40 cps, degree of saponification 88%) 10% by weight (2) Xanthan gum 0.5 (3) Polyethylene glycol 1500 * 8 (4) Titanium oxide 5 (5) Talc 10 (6) Ethanol 10 (10) Preservative appropriate amount (11) Fragrance appropriate amount (12) Purified water residue * Equivalent mixture of polyethylene glycol 300 and polyethylene glycol 1540 [Production method] According to Example 15. The result was that the average drying time was as short as 16 minutes and the viscosity stability was good.

[0033]

According to the present invention, it is possible to provide a pack cosmetic having a short drying time after application of the pack and having extremely good stability over time.

Claims (4)

[Claims] 1. A pack cosmetic comprising polyethylene glycol having a weight average molecular weight of 1300 to 1600 and polyvinyl alcohol. 2. The method according to claim 1, wherein the content of the polyethylene glycol is 2 to 7% by weight, and the content of the polyvinyl alcohol is 7 to 20% by weight.
Pack cosmetics as described. 3. A pack cosmetic comprising polyethylene glycol 1540 and polyvinyl alcohol. 4. The method according to claim 3, wherein the content of the polyethylene glycol is 2 to 7% by weight, and the content of the polyvinyl alcohol is 7 to 20% by weight.
Pack cosmetics as described.