JP3509118B2 - Method for improving consistency of cosmetics or external preparation for skin - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving the consistency of cosmetics or external preparations for skin. More particularly, the present invention relates to a method for improving the consistency of an oily base of a cosmetic or an external preparation for the skin which provides good extensibility and imparts excellent physical properties. [0002] Conventionally, lipsticks, lip balms, tics, pomades and ointments for non-medical use which are used as cosmetics include petroleum base as a raw material, such as petrolatum, liquid paraffin, solid paraffin, lanolin, beeswax, and the like. It is often used as a cosmetic or an ointment by blending it with a pigment, a fragrance, a preservative, a pharmaceutically active ingredient, and the like. These cosmetics and ointments are used to protect the skin and hair and maintain their health, or to perform treatments such as percutaneous absorption of medicinal ingredients. It depends on the purpose of use. And these cosmetics and ointments need a good feeling of use, are easily wettable on the skin and hair, and are used with an appropriate consistency to exert the effect of the contained active ingredient. . [0003] Lipsticks and lip balms as cosmetics are extremely smooth in appearance, have excellent affinity for skin and extensibility, and have an excellent emollient effect. There is also a demand for such characteristics as not changing quality. Similarly, in ointments as an external preparation for the skin, the protective action of the skin, the viscositive action,
In addition to functions such as drug delivery and transdermal absorption, maintenance of quality over a long period of time is required. In order to exhibit such characteristics, various oil-based substances have been blended, or some of them have been made into an emulsion of a water-in-oil type or the like.
However, there are many problems such as separation of the oil-liquid component depending on the blended component, and change in the consistency due to a change in the temperature, thereby impairing the usability. According to "Today's external preparation for skin" (Masahiko Takano, published by Nanzando in April 1984), Vaseline and the like have the disadvantages of low water absorption and low skin permeability and high adhesiveness. In addition, the melting point range is wide, and therefore, due to changes in temperature, those having a low melting point generally may even liquefy in summer. In order to improve such drawbacks, it is necessary to increase the consistency by compounding wax or solid paraffin, etc., but in order to obtain a sufficient effect, it is pointed out that the compounding is difficult and the product properties are not stable. ing. In order to eliminate such disadvantages, bases such as a mixture of a heavy hydrocarbon wax and a mineral oil have been developed. Although it is said that its consistency hardly changes even in a wide temperature range of 15 to 60 ° C., it has a disadvantage that once dissolved, the consistency is not restored. As described above, there is a problem that the amount of Vaseline or the like cannot be increased because the change in the consistency in summer and winter is large. In addition, although paraffin wax is also used as an oily raw material for cosmetics having a high degree of viscosity, if used improperly, it will be too hard in winter and soft and easily meltable in summer, and it is desired to improve its properties. ("Fats and surfactants for cosmetics" (by Hirota Hiroshi, 1970)
Published by Tsukiyuki Shobo)). [0005] As described above, the technique of improving the consistency of an oily base, which is the base of cosmetics and external preparations for the skin, to prevent softening due to temperature changes and to adjust the consistency arbitrarily. Was strongly desired. SUMMARY OF THE INVENTION In view of the above circumstances, the present inventors have made intensive studies on substances having improved product properties by improving the consistency of oily substances, and as a result, a specific sucrose fatty acid ester was produced. The present invention has been found to increase the consistency of the oleaginous substance by using the same, and to reduce the decrease in the consistency even at a higher temperature, thereby completing the present invention. That is, the gist of the present invention, the fatty acid constituting the sucrose ester is a number 14 or more saturated fatty acids of carbon, and the average degree of substitution of fatty acid to sucrose by using the sucrose fatty acid ester is a 4 to 7 To increase the consistency of the oily base and at higher temperatures
Disclosed is a method for improving the consistency of a cosmetic or a skin external preparation, which comprises reducing the decrease in consistency. Hereinafter, the present invention will be described in detail. The present invention uses a sucrose fatty acid ester wherein the fatty acid constituting the ester with sucrose is a saturated fatty acid having 14 or more carbon atoms, and the average degree of substitution of the fatty acid for sucrose is 4 to 7,
Examples of the fatty acid having 14 or more carbon atoms include myristic acid, palmitic acid, stearic acid, arachinic acid, and behenic acid, and particularly, palmitic acid and stearic acid are preferably used. Since these fatty acids are usually obtained from natural fats and oils, various fatty acids are usually mixed, and the purity of the fatty acids is 50% or more, preferably 60% or more. [0008] The raw oily substances constituting the oil phase in the present invention include hydrocarbons such as white petrolatum, yellow petrolatum, liquid paraffin, isoper, squalene, squalane, platinum base, purified lanolin, lanolin alcohol, cholesterol, isopropyllanolin, Lanolin and its derivatives such as acetylated lanolin, beeswax,
Beeswax, whale wax, isopropyl myristate,
Fatty acids such as isopropyl palmitate and acetoglyceride and fatty acid esters of higher and lower alcohols, higher fatty acids such as myristic acid, palmitic acid and stearic acid, camellia oil, peanut oil, olive oil, soybean oil,
Corn oil, Menzuki oil, castor oil, vegetable oils such as coconut oil, liver oil, fish oil, animal fats and oils such as lard, and these animal, hardened oil of vegetable fats and oils, cetal,
Single products such as fatty acid higher alcohols such as stearyl alcohol, silicone oil and the like, and mixtures of these oily substances are exemplified. These oily substances include those having various shapes such as liquid paraffin, isopropyl myristate, etc., which are fluid at normal temperature, semi-solid substances such as white petrolatum, and solid substances such as beeswax and stearic acid. Depending on the purpose of use, such as cosmetics such as cold creams and hand creams, and ointments as external preparations for medicines, they are used as single products or mixtures of various raw materials. When the external preparation for skin such as cosmetics and ointment is manufactured by the method of the present invention, the amount of the sucrose fatty acid ester used is 0.1 to 5% by weight, preferably 0.5 to 3%.
% By weight (based on the total composition). If necessary, another emulsifier may be used in combination. When the content is less than 0.1% by weight, the effect of adjusting the consistency is poor, and when it is more than 5% by weight, the cost is increased. _ As a method for producing a skin external preparation such as a cosmetic or an ointment, for example, the sucrose fatty acid ester can be easily produced by dissolving the sucrose fatty acid ester in a raw oily substance together with other components, with or without stirring while cooling. Raw oily substances include
Various chemicals, acidic substances, preservatives, fragrances, pigments, antioxidants and the like used in cosmetics and external preparations for the skin may be added in advance according to the purpose. According to the present invention , the above-mentioned sucrose fatty acid is used.
It is presumed that by using an ester , fine crystals are formed in the oily substance to maintain its network, thereby increasing the consistency. At the same time, it is presumed that such a crystal network prevents a decrease in consistency due to a change such as an increase in temperature, and it has not been known that an emulsifier has such an effect. EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the scope of the invention. Examples 1 to 3, Comparative Examples 1 to 9 150 parts by weight of white petrolatum (reagent) was placed in a beaker,
1.5 parts by weight of the emulsifier shown in Table 1 was added thereto, and the mixture was heated to 82 ° C. to dissolve the emulsifier transparently. This was stored in a thermostat at 25 ° C. for 2 weeks. Next, use a rheometer (NR
M-2002J), the indentation load (g) of petrolatum was measured under the following conditions to obtain petrolatum consistency. Further, the measured petrolatum is again put into a thermostat at 30 ° C. and
After storage for a day, the indentation load (g) was measured again by a rheometer. Table 1 shows the results. In addition, the crystal state and the size of the petrolatum at 25 ° C. were observed with an optical microscope. In Table 1, the softening rate (%) was determined by the following equation. Rheometer measurement condition adapter 1 cm diameter round plate flat table speed 20 mm / cm Recorder chart speed 20 mm / cm Measurement temperature 25 ° C., 30 ° C. [Table 1] Example 4 67 parts by weight of white petrolatum, 12 parts by weight of liquid paraffin,
One part by weight of sucrose stearic acid ester (average degree of substitution 5.5) is heated and mixed at 80 ° C. While stirring this 3
After cooling to about 5 ° C., 20 parts by weight of zinc oxide fine powder was added and further kneaded to produce a zinc white ointment. The obtained zinc white ointment was excellent in appearance, hardness and extensibility. Examples 5 to 6, Comparative Example 10 33 parts by weight of beeswax (reagent) and 100 parts by weight of olive oil were placed in a 300 ml beaker, 1.3 parts by weight of the emulsifier shown in Table 2 was added thereto, and the mixture was heated to about 82 ° C. To dissolve the emulsifier transparently. This is stirred by a propeller stirrer (15
(0 rpm), and gradually cooled to 40 ° C. to precipitate crystals to produce a single ointment. After this was stored in a 25 ° C constant temperature bath for one week, the indentation load (g) was measured using a rheometer (manufactured by Fudo Kogyo) in the same manner as in Examples 1 to 3. Then, after it was stored at 30 ° C. for 3 days, the indentation load (g) was measured as in the case of 25 ° C. Example 1
The softening rate was determined in the same manner as in Examples 1 to 3. Table 2 shows the results. The case where no emulsifier was added was shown as Comparative Example 10. [Table 2] According to the present invention, it is possible to improve the consistency of the base of cosmetics and external preparations for skin, and to provide cosmetics and external preparations having excellent quality. In particular, the effect of reducing the softening rate of the fat component due to the temperature change is great.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI // C07H13 / 06 C07H13 / 06 (56) References JP-A-49-65996 (JP, A) JP-A-2-184614 (JP, A) JP-A-61-56115 (JP, A) JP-A-4-136098 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C09K 3/00 103 A61K 7 / 00-7/48 A61K 9/06 A61K 47/26 C07H 13/06

Claims (1)

(57) [Claim 1] The fatty acid constituting the ester with sucrose is
Using a sucrose fatty acid ester having a saturated fatty acid having 14 or more carbon atoms and an average degree of substitution of the fatty acid with sucrose of 4 to 7 to increase the consistency of the oily base and increase the temperature.
A method for improving the consistency of a cosmetic or an external preparation for skin , characterized in that the decrease in consistency is reduced .