JPH036180B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a gel composition, particularly a gel composition based on silicone oil that does not use fillers such as silica and is useful as a base material for cosmetics. (Prior art) Various silicone oils are added to pastes, creams, pressed compositions, etc. for cosmetics and medical purposes, but there are few examples of use of silicone compositions as a base material. To make silico-oil into a gel, it is necessary to add thickeners such as hydrophobic silica and bentone as inorganic fillers, and the silico-oil used also has a viscosity of 100 cS or more at 25°C. Because it needs to have a high viscosity, when the gel-like material obtained in this way is applied to the skin surface, it feels heavy and has a long-lasting sticky feeling because it has almost no volatile content. Accordingly, there has been a long-awaited need for a gel-like composition based on silicone, which has low viscosity and high volatility and solves these drawbacks. (Structure of the Invention ) The present invention relates to a silicone-based gel composition that solves the above-mentioned disadvantages. 30 to 90 parts by weight of the indicated cyclic dimethyl polysiloxane, (2) an ester of a fatty acid having 8 to 24 carbon atoms and a fatty acid alcohol having 1 to 24 carbon atoms or 10 to 40 carbon atoms;
(3) dextrin fatty acid ester (5 to 30 parts by weight). That is, as a result of various studies conducted by the present inventors on gel compositions based on silicone oil, which are useful for cosmetics, medical applications, etc., we have found that cyclic dimethylpolysiloxane represented by the above formula is used as the silicone oil. In addition, if an ester of a higher fatty acid with an aliphatic alcohol or an aliphatic hydrocarbon and a dextrin fatty acid ester is used as the gelling agent, the desired gel composition can be easily obtained. We have confirmed that when applied to the skin, the spread is light and the feeling is refreshing, and the cyclic dimethylpolysiloxane evaporates after application, so the wet feeling does not remain for any length of time. The present invention was completed. The silicone oil as the first component constituting the gel composition of the present invention has the formula It is said to be a cyclic dimethylpolysiloxane represented by, but it is desirable that this product exhibits its properties after using a gel composition containing it.
This n value is set to 3 to 6. Note that this substance may be used alone or in a mixture of two or more types, but if the amount of this first component is 30 parts by weight or less in 100 parts by weight of the gel composition, other components may be used. If the amount exceeds 90 parts by weight, it will impair the easy spreadability expected of this composition, increase the stickiness, and if it exceeds 90 parts by weight, sufficient gelation will not be achieved. The preferred range is 40 to 8 parts by weight. Further, as described above, the second component in this composition is a higher fatty acid having 8 to 20 carbon atoms and a higher fatty acid having 1 to 20 carbon atoms.
Esters with aliphatic alcohols of 24 or carbon numbers
10 to 40 aliphatic hydrocarbons, including isopropyl myristate, butyl myristate, myristyl myristate, octyldecyl myristate, cetyl isooctylate, decyl oleate, butyl stearate, hexyl laurate, and isopropyl palmitate. , higher fatty acid monoesters such as butyl palmitate, higher fatty acid diesters such as propylene glycol dioleate, neopentyl glycol di-2-ethylhexanoate, higher fatty acid triesters such as caprylic acid triglyceride and capric acid triglyceride, and even squalane. , Isopar [manufactured by Exxon Chemical Co., Ltd., trade name of aliphatic hydrocarbon solvent], etc., and these may be used alone or in a mixture of two or more. Note that if the amount of this second component used is 5 parts by weight or less in 100 parts by weight of the gelling composition, the amount of the second component used is less than the first amount.
If the silicone oil as a component does not gel, and if it exceeds 50 parts by weight, the resulting gel-like composition will have poor light extensibility and increase stickiness, so use a range of 5 to 50 parts by weight. The preferred range is 7 to 45 parts by weight. Next, the dextrin fatty acid ester as the third component in this gel composition has, for example, the following structural formula: A is a hydrogen atom or an acyl group having 8 to 20 carbon atoms, and 50% or more of the total number of moles of A is an acyl group, l
is said to be 20 to 30, and if the amount of this third component is less than 5 parts by weight in 100 parts by weight of the gel composition, gelation of the silicone oil will not proceed; If this is done, the resulting composition will be too hard and have poor extensibility, so
A range of 30 parts by weight is required, but
The preferred range is 7 to 25 parts by weight. The gel composition of the present invention can be obtained by uniformly mixing predetermined amounts of the first to third components described above, but this mixing is preferably carried out at 50 to 100°C, for example at 100°C. The desired homogeneous gel composition can be obtained by uniformly dissolving the aforementioned fatty acid ester or aliphatic hydrocarbon and dextrin resin ester in silicone oil by heating and stirring at a temperature below .degree. C. and then cooling. In addition,
This composition includes various oily agents, fragrances, pharmaceutical ingredients,
Addition of antioxidants, pigments, dyes, etc. is optional as long as it does not significantly change the properties of the composition of the present invention. Next, examples of the present invention will be given, in which parts are parts by weight, and viscosity is a value measured at 25°C. Examples 1 to 10 Octamethylcyclotetrasiloxane KF994 (trade name manufactured by Shin-Etsu Chemical Co., Ltd.) in the amounts shown in Table 1
and decamethylcyclopentasiloxane KF995
[Product name manufactured by the company] higher fatty acid ester or aliphatic hydrocarbon of the type and amount shown in Table 1 and dextrin fatty acid ester Leopard KL in the amount shown in Table 1 [Product name manufactured by Chiba Flour Milling Co., Ltd.] The total amount of 300g was put into a 500ml hard glass flask, stirred at 60 to 70℃, and after confirming that it had become a homogeneous solution, stirring was stopped and quenched in an ice water bath. Since a gel-like composition was obtained, the consistency and oil separation degree of this composition were determined by JIS.
When measured using a method based on K2220, the results shown in Table 1 were obtained.

[Table] Comparative Example To 270 parts of the cyclic dimethylpolysiloxane KF994 or KF995 used in the example, 30 parts of dextrin fatty ester Leopard KL [trade name manufactured by Chiba Flour Milling Co., Ltd.] was added, and the mixture was placed in a 500 ml hardened glass flask. Although the mixture was stirred at 60 to 70℃, Leopard KL did not dissolve uniformly in the silicone oil, and when it was rapidly cooled in an ice water bath after stirring, Leopard KL precipitated.
No gelation was observed at all.

Claims (1)

[Claims] 1 (1) Formula Cyclic dimethylpolysiloxane represented by
30 to 90 parts by weight, (2) One or more mixtures selected from esters of fatty acids with 8 to 24 carbon atoms and aliphatic alcohols with 1 to 24 carbon atoms, or aliphatic hydrocarbons with 10 to 40 carbon atoms. (3) 5 to 30 parts by weight of dextrin fatty acid ester.