JPH0314284B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to cosmetics containing carbon dioxide gas that give a pleasant sensation of irritation to the skin when used. Carbon dioxide gas has been known to have a vasodilatory effect, and has been clinically used as a carbon dioxide gas bath for rehabilitation. Therefore, the inventor of the present invention focused on incorporating carbon dioxide gas into cosmetics, and as a result of conducting various studies, found that when carbon dioxide gas is incorporated into aqueous cosmetics, it not only exhibits a vasodilatory effect upon use, but also causes irritation to the skin. The present invention has been completed based on the discovery that a comfortable feel can be obtained. A non-self-spraying cosmetic is provided by blending 100 parts by weight of an aqueous cosmetic with 0.1 to 0.5 parts by weight of carbon dioxide gas, adjusting the pH to 5 to 6.5, and sealing it in a pressure-resistant container. In the present invention, examples of aqueous cosmetics that can contain carbon dioxide gas include cosmetics with relatively high water content, such as lotions, milky lotions, hair lotions,
Examples include hair tonics, shampoos, conditioners, etc. By the way, carbon dioxide gas exists as CO ₂ molecules when the pH of the solution in which it is dissolved is acidic.
It is known to exhibit vasodilatory effects. Therefore, the liquid properties of the cosmetics of the present invention are below PH7, especially at PH5.
It is preferable to adjust it to ~6.5. Note that the pH of water-based cosmetics is determined by the fact that carbon dioxide gas is forced into the water-based cosmetics, and when this gas dissolves into the water-based cosmetics, the acidity becomes even stronger, but the final pH
may be adjusted so that it falls within the above range. This PH
As the regulator, organic acids such as citric acid and tartaric acid or salts thereof, or phosphoric acid or salts thereof are preferably used. To incorporate carbon dioxide gas into water-based cosmetics, the water-based cosmetics are placed in a pressure-resistant container and high-pressure gas is sealed in it, or the water-based cosmetics containing carbonate such as sodium bicarbonate is placed in the pressure-resistant container. Methods such as adding a PH regulator to generate carbon dioxide gas and immediately sealing it, or placing dry ice pellets in a container and sealing it are adopted, but the method of sealing in high-pressure gas is particularly preferred. . When this is done, part of the carbon dioxide gas is dissolved and blended into the aqueous cosmetic, and part of it is present in the container as a gas. In the present invention, it is important that carbon dioxide is dissolved in the aqueous cosmetic, and it is preferable that the concentration of carbon dioxide is 60 ppm or more. This cannot be expected, and the effects of the present invention cannot be obtained. The amount of carbon dioxide gas blended can be adjusted by changing the amount of carbon dioxide gas injected. However, if 0.1 to 0.5 parts by weight of carbon dioxide gas is added to 100 parts by weight of an aqueous cosmetic, it will not function as a propellant. In addition, the pressure-resistant container used in the present invention must be able to withstand the above-mentioned pressure and keep the cosmetic in a sealed state until it is used after preparation. Synthetic resin containers such as polycarbonate-based resins and polycarbonate-based resins, and glass containers are used. Also, this container is 1
A size suitable for multiple use is preferred. The cosmetic of the present invention can be used in the same manner as conventional cosmetics by opening the container. At this time, the carbon dioxide gas present in the container in gaseous form evaporates, but the carbon dioxide dissolved in the water-based cosmetic does not significantly decrease until about 30 minutes after opening the container. If used during this period, the effects of the present invention will be fully exhibited. As mentioned above, since the cosmetic of the present invention contains carbon dioxide gas, it improves blood circulation in the skin due to the vasodilatory effect of carbon dioxide gas, and provides a pleasant irritating feeling due to its foaming effect. Furthermore, since the PH of the cosmetic itself is slightly acidic, it is close to the PH of the skin and has a favorable effect on the skin. Next, a description will be given with reference to test examples and examples. Test Example 1 10 ml of lotion with the following composition was placed in a pressure-resistant container, and 0.01 g of carbon dioxide gas was injected into the container and sealed (product of the present invention) and one without carbon dioxide (comparison product) was given to 10 women. We asked them to use it and evaluate its usability based on the following evaluation criteria. The results are shown in Table 1. Composition Glycerin 5.0 (wt%) Propylene glycol 4.0 Polyoxyethylene sorbitan monolauric acid ester (20 EO added) 1.5 Polyoxyethylene lauryl ether (20 EO added) 0.5 Ethanol 10.0 Flavor 0.1 Preservative Appropriate amount Purified water 78.9 Total 100 Evaluation criteria 5: Comfortable irritation 4: Somewhat pleasant irritation 3: No irritation or irritation but neither comfortable nor unpleasant 2: Somewhat unpleasant irritation 1: Unpleasant irritation

[Table] Test Example 2 5 ml of hair lotion with the following composition was filled into a pressure-resistant container, and 0.025 g of carbon dioxide gas was injected into the container, which was then sealed (invention product) and one without carbon dioxide gas (comparison product). Ten men were asked to use the product and evaluate its usability based on the same evaluation criteria as Test Example 1. The results are shown in Table 2. Composition Ethanol (95%) 49.5 (wt%) Purified water 49.6 L-menthol 0.2 Capsicum tincture 0.5 Glycerin 1.2 Flavor 1.5 Colorant Appropriate amount Total 100.0

[Table] From the results of Test Examples 1 and 2, it can be seen that the products of the present invention have a more comfortable stimulation sensation during use than the conventional products. Example 1 Take 10ml of a liquid with the following composition and fill it into a pressure-resistant container.
After pressurizing 0.01 g of carbon dioxide into the container, the container is sealed and used as a cosmetic. Composition Glycerin 5.0 (wt%) Propylene glycol 4.0 Polyoxyethylene sorbitan monolaurate (20EO) 1.5 Polyoxyethylene lauryl ether (20EO) 0.5 Ethanol 10.0 Flavor 0.1 Preservative Appropriate amount Purified water 79.2 Total 100.0 Example 2 Composition Ethanol (95%) 49.5 (wt%) Purified water 47.1 L-menthol 0.2 Capsicum tincture 0.5 Glycerin 1.2 Flavor 1.5 Color Appropriate amount Total 100.0 Dissolve chemicals and fragrance in 95% ethanol, and add purified water to this. When added, a cloudy liquid is obtained. Next, 3 to 5 g of talc is added to the solution to adsorb the precipitate and form a clear liquid. Furthermore, this is passed through and colored appropriately with a dye. Take 5 ml of the solution, fill it in a pressure-resistant container, press-fit 0.025 g of carbon dioxide gas into the container, and then seal it to make a hair lotion.

Claims (1)

[Claims] 1. A non-self-spraying cosmetic prepared by blending 0.1 to 0.5 parts by weight of carbon dioxide gas to 100 parts by weight of an aqueous cosmetic, adjusting the pH to 5 to 6.5, and sealing it in a pressure-resistant container.