KR850000385B1 - Toilet soap bars imparting improved moisturing and skin feel characteristics - Google Patents

Abstract

Soap compsns. comprise 60-95 wt.% anhydrous alkal; metal, ammonium or alkanolamine soap of C12-8 fatty acid; 5-25 wt.% moisture; and 0.1-15 wt.% of one or a mixt. of (i) polypropoxylated compds. of formula R- (OCHCH3CH2)nOH, where R is C3-6 hydrocarbyl and n is 9-50; (ii) compds. of formula R(CO)n(OCHCH3CH2)nOH where R is C7-35 hydrocarbyl, n is 9-50 and y is 0 or 1; (iii) compds. of formual R(CO)y(OCH2CH2)nOH, where R is C3-35 hydrocarbyl, n is 9-50 and 9 is 0 or 1. The compsns. give improved skin softness but do not cause increased transpirational water loss.

Description

Cosmetic soap with improved moisturizing properties

The present invention relates to a cosmetic soap that reduces the amount of water loss from the skin. Skin dryness is of great interest in the soap and cosmetic industry and is a common concern for humans. To solve this condition, various attempts have been made. For example, a softener can be used to exert a physical relieving effect on the skin, but this is only temporary. Other substances, called moisturizers, are added to transfer moisture from deep into the skin and from the atmosphere to the surface layer of the skin. Still other substances are used to prevent water loss from the surface of the skin and other substances that affect skin metabolism are also used. The most common attempt is to fill the rough skin and the uneven parts of the epidermal layer and use a mitigating agent to offset the dry symptoms. However, in most cases, the effect is temporary, so the physiological function of the skin It does not affect.

As generally recognized, natural oils and water for skin have a moisturizing effect on the skin, so the hydration level of the stratum corneum is important. Several factors affect the degree of hydration, including the rate at which water reaches the stratum corneum from the lower layers of the skin. The ability of the stratum corneum to retain moisture and the rate at which moisture evaporates from the skin. These factors are related to all transpirational water, ie the water moving from the lower skin layer to the stratum corneum. Soaps and cosmetics affect the skin. Therefore, measuring transpirationul water loss (TWL) from the stratum corneum is one way to evaluate the moisturizing capacity of various soaps and cosmetics.

The present invention relates to a cosmetic soap that reduces the loss of moisture from the skin. The cosmetic soap mainly consists of alkali metal or alkanolamine salts of various fatty acids having 12-18 water-soluble ammonium carbon atoms. Representative of such soap bases are lauric acid, stearic acid and palmitic acid derived from various sources, including animal fats, vegetable oils, fish oils and whale oils. Sodium and potassium salts of tallow and coco fats are preferred, with the ratio of sodium uji soap and sodium coco soap being from 90-10 to 50-50. In particular, suitable ratios of these two soap bases are 85:15 and 70:30.

The inventors have found that soaps made from 60-95% anhydrous soap base, 5-25% moisture, and 0.1-15% polymerized materials having the following formulas [I-III and (4)] are used. Is the amount of transpiration loss.

(1) polypropoxylated material of formula (I)

However, in the above formula

n: average value between 9-50

R is a carbon atom having 3-6 hydrocarbon radicals

(2) polypropoxylated material of formula (II)

However, in the above formula

n: average value between 9-50

R is a hydrocarbon radical having 7 to 35 carbon atoms

y: 0 or 1

(3) polyethoxylated material of formula (III)

However, in the above formula

n: average value between 9-50

R is a hydrocarbon radical having 3-35 carbon atoms

y: 0 or 1

(4) a mixture of these substances

In addition, the amount of the compounds represented by the formulas (I), (II) and (III) and the mixture thereof are preferably 0.5-5%.

A compound that can be selected for practicing the present invention is PPG-14 butyl ether, which is a polypropylene glycol ether of butyl alcohol having the formula:

In the above formula, n has an average value of 14. The material is marketed by Union Carbide under the name Fluid AP. Such compounds having the formula (I), when added to the solid soap in a certain amount, suppresses the amount of transpiration water loss from the skin.

Other compounds that can be selected and used to practice the invention include PPG-20 propyl ether and PPG-30 butyl ether, both of which are of formula (I), and also PPG-30 isocetyl ether, PPG-11 stearyl ether, There are also PPG-9 laurate and PPG-36 oleate, all of which are of formula (II), and PEG-30 dearyl ether, PEG-20 stearic acid and PEG-20 oleate, of formula (III).

The solid soap according to the present invention is prepared according to the following method starting with pure soap without burning water. Soap preparation methods are described in detail in the Encyclopedia of Cemical Technology, Vol. 18, pp. 415-432. Conventionally, a fatty acid or ester is saponified by an analytical method or a continuous saponification method to prepare pure soap having a moisture content of about 30%, and then the soap content is reduced to 10-15% to pellet the soap. I will.

In the practice of the present invention, the pelletized soap is put in a fusion machine, and a mixture of perfume and at least one polymer of formula (I-III) is added. Moreover, you may add the liquid slurry containing other required additives at this time. The treated pellets are then transferred to a floater, sieved, extruded into agglomerates, and the solid soap is made in a known manner.

The present invention is described in detail according to the embodiment.

Example 1

The following solid soap was made and carried out to nine test subjects, and each test composition and the basic test composition were carried out in a group of three subjects.

Each of the above compositions were measured by electrical hygrometer (EH) using the following method. In other words, in selecting the two test sites on the front arm of the person to be tested and measuring the TWL of each site, place the test room at the test site and pass air of constant relative humidity to pass the test room. The flow rate from the hygrometer and the flow rate into the hygrometer were measured and the humidity of the circulating air was measured.

After measuring the TWL values of the two untreated sites, one site was treated with the test substance, dried, and the TWL values of the two sites were measured again. The TWL ratio for each site was obtained by dividing the second measurement by the first measurement. For example, the treated area is divided by the measured value of the first side obtained at this site before treatment. To obtain an EH value as shown below, divide the TWL ratio for the treated site by the TWL ratio for the untreated site. By doing so, it is possible to normalize the TWL ratio of the treated site and to remove the errors caused by the normal physiological changes in the subject during the experiment.

The EH value is obtained by dividing the TWL ratio of the treated site by the TWL ratio of the untreated site. The EH deviation values are as follows.

If the substance had an EH value of 1.0, the TWL did not change at the treated site compared to the untreated site. If the EH value is more than 1.0, the TWL of the treated site is larger than the TWL of the untreated site. Therefore, the above values show that the solid soap containing PPG-14 butyl ether is decreased in the amount of transpiration water loss compared to the basic composition. Containing only polyethylene glycol with -5M (molecular weight Ca. 220,000) increases the amount of transpiration loss, whereas soaps containing PPG-14 butylether and PEG-5M are extremely comparable to those containing only PPG-14 butylether. Obviously, the use of PPG-14 butyl ether reduces the amount of transpiration moisture loss.

Example 2

Similar results were obtained on a large scale study using 25 subjects. The soap of the base composition having the same composition as the base composition shown in Example 1 was compared with a test soap containing PPG-14 butyl ether and PEG-5M in an amount derived from oil. EH values were as follows.

As in Example 1, it can be seen that the soap containing PPG-5M and PPG-14 butyl ether was significantly reduced in the amount of evaporated moisture compared to the basic composition.

Claims (1)

(A) Anhydrous, soap, base, about 60-95 wt. Using a fatty acid having 12-18 carbon atoms as a salt in alkali metal, amonium or alkanolamine. %Wow (B) moisture about 5-25% and (C) Cosmetic soaps, which make up about 0.1-15% of the polymer used in [(1)-(4)] and which reduce the amount of transpiration moisture when used on the skin. (1) A polypropoxylated material of the following formula.

Where n is an average value between 9-50 and R is a hydrocarbon radical having 3-6 carbon atoms. (2) polypropoxylated material of formula

The mean value between n and 9-50 in the unit formula. R: hydrocarbon radical having 7-35 carbon atoms y: 0 or 1. (3) polyethoxylated material of formula

However, in the above formula n: average value between 9-50 R is a hydrocarbon radical having 3-35 carbon atoms (4) a mixture of all the above substances.