JPS60163807A - Pack - Google Patents

Abstract

PURPOSE:A pack, containing an acidic buffer agent in a base which is a fat or oil absorbing powder, having high fat absorptivity and improved makeup durability, and capable of giving a wide feeling of use ranging from dry to moist touch. CONSTITUTION:A pack containing 0.5-5.0% concentration buffer agent in a base consisting of fat or oil absorbing powder which is an inorganic powder, e.g. talc, kaolin, silicic acid anhydride or calcium carbonate, a spherical or amorphous organic powder, e.g. nylon, PVC or polyproplylene, or a suitably hydrophilized powder thereof. The acidic buffer agent preferably has 3.0-5.0pH of an aqueous solution thereof, and lactic acid-sodium lactate, sodium citrate-hydrochloric acid and succinic acid-borax, etc. may be used.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel pack agent, and more particularly to a pack agent with high oil and fat absorption effects.

Conventionally, the pack agents that have been generally provided mainly for oil absorption are based on powders with high oil absorption such as kaolin, talc, bentonite, anhydrous silicic acid, hydrated silicic acid, and calcium carbonate. Bools, ethanol, pigments,
Most of the products contained fragrances, water, etc. When applied to the skin, such packs that are entirely based on highly oil-absorbing powder pass through the gaps between the powder particles of the pack that have dried on the skin, allowing the sebum secreted from the skin to spread over time. Because it rises to the surface and is retained between powder particles, it has the effect of preventing makeup from fading after backing. Especially for people who have a constitution that secretes a lot of sebum, or during the summer season when sebum secretion is high, the amount of sebum secreted increases, so even for normal people, makeup powder applied to the surface of the skin can cause makeup. (This kind of oil-absorbing pack agent has been useful because it tends to cause slippage. However, conventional pack agents do not have sufficient oil-absorbing properties, and are not always effective in terms of the feeling of use after the pack and the longevity of makeup.) It wasn't satisfying.

In view of the current situation, the present inventor has conducted intensive research and found that if an oil-absorbing base containing an acidic buffer is used, it will have a higher oil-absorbing property and make-up last longer when applied to the skin. The present invention has been completed based on the discovery that it is possible to obtain a pack agent that has excellent properties and provides a wide range of sensations on the skin, from a light feel (silky feel) to a moist feel.

That is, the present invention provides a pack agent characterized in that an acidic buffer is completely contained in the base, which is oil-absorbing powder.

The oil-absorbing powder that is the base of the pack agent of the present invention includes:
Among those used in ordinary clay type packs, those with fine particle size and large specific surface area are preferred.
For example, talc, kaolin, silicic anhydride, bentonite,
Examples include inorganic powders such as sericite, diatomaceous earth, and calcium carbonate; spherical or irregularly shaped organic powders such as nylon powder, polyvinyl chloride, polypropylene, and polystyrene. In addition, as the base of the pack agent of the present invention, the various oil-absorbing powders described above may be suitably treated to make them lipophilic. A suitable method is to appropriately select a water repellent such as soap and a known cosmetic oil for coating and baking. The above-mentioned base is preferably blended in the pack agent of the present invention in an amount of 10 to 80% by weight (hereinafter referred to as H).

Examples of the acidic buffer used in the present invention include lactic acid-
Sodium lactate, citric acid - potassium hydrogen citrate, sodium citrate - hydrochloric acid, succinic acid - borax, tartaric acid -
Examples include those containing organic acids or salts thereof such as sodium tartrate. The pn of the aqueous solution of the acidic buffer is 3.0~
It is desirable that it be 50. If the pH is less than 3.0, skin irritation becomes a problem, and if it exceeds 5.0'i, the amount of sebum adsorbed is extremely reduced. Moreover, it is preferable to mix|blend 0.5-5.0% of acidic buffers in the pack agent of this invention. When the concentration of acidic buffer is less than 0.5%, due to the buffering capacity of the skin, even I)
Even if a buffer with low H is applied, the pH at the contact surface between the pack agent and the skin will not decrease, and the amount of sebum adsorbed to the powder cannot be increased, and if it exceeds 5.0%, Although the amount of N absorbed by sebum increases to some extent, the feeling of irritation to the skin increases.

The pack agent of the present invention includes the above-mentioned six essential ingredients, as well as various components normally used in pack agents, such as known powders;
Known cosmetic ingredients such as polymer compounds, surfactants, oils, proteins, polypeptides, fragrances, organic pigments, inorganic pigments, natural pigments, dyes, preservatives, ultraviolet absorbers, vitamins, etc. can be added and blended. . The pack agent of the present invention is produced by adding water to each of the above components and stirring and mixing them uniformly.

Next, I will give an example and show the original F! Ak will explain.

Example 1 A pack with the following composition was prepared by keeping the amount of lactic acid buffer (lactic acid-sodium lactate) constant and varying the blending ratio of lactic acid and sodium lactate, and this was used by four women with oily skin. The amount of sebum adsorbed to the pack agent was quantified using the osmic acid coloring method. At the same time, the sensation of irritation was evaluated. The results are shown in Table 1.

(Pack composition) Kaolin 10 (%) Bentonite 10 Nylon powder 2 Titanium oxide 1 Lactic acid buffer (composition; Table 1) 3 Preservative 0.2 Fragrance 0.3 Pigment Trace amount of ion-exchanged water Balance (determination of adsorption amount) Method) After applying the pack agent e o, 01 to the foreheads of four women with oily skin, the pack agent was allowed to stand for 5 minutes, and after the pack agent had dried, it was removed. Next, sebum is extracted from this pack using an acetone/ether mixture, impregnated with a certain amount on a paper sheet, and colored with osminic acid. The total amount was calculated.

Below margin Table 1 *pH of 1% lactic acid buffer.

As shown in Table 1, at pH 2 and 3, the amount of sebum adsorbed is irritable and has an irritating feeling, and there are problems as a pack agent, and at pH 5 and 3, the amount of sebum adsorption is 1) H5,0. It was extremely low compared to , and was almost equivalent to that without the lactic acid buffer. Therefore, in the pH range of 3.0 to 5.0, the sebum adsorption effect increases compared to those without lactic acid buffer, and the particularly favorable range is pH 3.5 to 4 in terms of both the amount of sebum adsorption and the feeling of irritation. .5.

Example 2 In a citric acid/hydrochloric acid buffer, the blending ratio of sodium citrate and hydrochloric acid was fixed, and the blending amount of the buffer was changed,
A pack agent (pH 4,0) with the following composition was adjusted. This pack agent was used by four women with oily skin in the same manner as in Example 1, and the amount of sebum adsorbed to the pack agent and the sensation of irritation were evaluated. At the same time, after using the pack agent, a commercially available powder foundation was used to evaluate how long the makeup lasted.

The results are shown in Table 2.

(Pack composition) Bentonite 10 (%) Talc 20 Sericite 10 Anhydrous silicon e2 Titanium oxide 3 Citric acid/hydrochloric acid buffer Table 2 [Sodium citrate/hydrochloric acid (weight ratio) -9,110
, 9] Preservatives. , 2 Fragrance 0.1 Pigment Trace amount of ion or water exchange Rose, Su (pH 4,0) Table 2 As shown in Table 2, the amount of sebum adsorbed to the pack agent is small until the buffering agent content is 0.4 The amount of sebum adsorption hardly increases,
A significant increase in the amount of sebum adsorption was observed at 0.5% or more. In addition, good results were obtained in terms of makeup retention when the amount was 0.5% or more. However, if the amount of buffering agent exceeds 5 parts, it is not preferable because a feeling of irritation occurs during use of the pack. Therefore, the blending amount of the buffering agent is preferably 0.5 to 5.0%.

Example 3 (Pack composition) Talc 10 (%) Silicone oil treated sericite 5 Polyvinyl chloride 2 Aluminum silicate 10 Hydroxyapatite 10 10 Pyrene glycol 20 Hyaluronic acid 0.02 Polyoxyethylene hydrogenated castor oil 0.5 ( 40 moles of ethylene oxide added) Tartaric acid buffer 2.5 [Tartaric acid/sodium tartrate (weight ratio) = 0.04
/99.96) Preservative 0.3 Fragrance 0.1 Pigment Trace amount of ion-exchanged water Balance (pH 3, 8) A backing agent was prepared by stirring and mixing all of the above components.

When this backing agent was used by women with oily skin, it was found that the backing agent of the present invention has an excellent sebum removal effect, provides good makeup application, and is effective in preventing makeup from fading. In addition, the feeling of use was smooth, and the skin was smooth after use.

that's all (11) -ri0-

Claims (1)

[Scope of Claims] 1. A pack characterized by containing an acidic buffer in a base that is oil-absorbing powder. λ The acidic buffer has a pH of 3.0 to 5.0 in its aqueous solution.
A noxious agent according to claim 1, which is a deodorant. 3. The pack agent according to claim 1 or 2, wherein the concentration of the acidic buffer in the pack agent is 0.5 to 5.0% by weight.