JPS63152308A - Silicon gel composition and cosmetic containing said composition - Google Patents

Abstract

PURPOSE:To obtain a soft silicon gel having excellent stability consisting of silicone gel having a silicone oil-insoluble three-dimensional network structure and a low-viscosity silicone oil and a safe cosmetic having excellent feeing in use, utility and stability with time containing the said silicone gel. CONSTITUTION:A silicone gel composition consisting of silicone gel obtained by crosslinking and polymerizing an organohydrogen polysiloxane (R is 1-4C alkyl or phenyl; R' is R, H, OH or alkoxyl) which has constituent units of a unit shown by the formula R2R'SiO1/2 at the molecular chain end, three or more units shown by the formula RHSIO in the molecule and a ratio of the unit shown by the formula RHSiO and a unit shown by the formula R2SiO of 1:1-30 and a low-viscosity silicone oil and a cosmetic containing the said composition. The cosmetic has smooth and refreshing feeling. The composition is produced by sufficiently kneading the silicone gel with the low-viscosity silicone oil and swelling.

Description

Detailed Description of the Invention [Industrial Application Field 1] The present invention relates to a silicone gel composition comprising a specific silicone gel and a low-viscosity silicone oil, and a cosmetic containing the same. A silicone gel composition that has excellent stability and is particularly useful as a material for cosmetics, and by containing it, it has a smooth and light feel, ease of use, and is highly safe with excellent stability over time. The purpose is to provide cosmetics.

[Prior Art] Silicone oil has been applied to various products due to its excellent properties, and is often used as a useful oil component especially in cosmetics. This means that silicone oil has less stickiness, is smooth, spreads well, has a light feel, is rich in lubricity and water repellency, and is tasteless.
This is because it has favorable characteristics or conditions such as being odorless and having high skin safety. Therefore, studies have been made to commercialize basic cosmetics and hair cosmetics that treat and protect the skin and hair, or make-up cosmetics that have good long-lasting makeup, by blending and utilizing silicone oil with a good feeling of use. It's here.

Typically, such silicone oils for cosmetics include linear dimethylpolysiloxane with different molecular weights and viscosities, cyclic octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, methylphenylpolysiloxane, methylhydrodiene polysiloxane, etc. Examples include siloxane, and other types of polymerized/copolymerized products and modified products are commercially available.

These various silicone oils are used properly or in combination, taking into account cosmetic purposes and expected effects. For example, low-viscosity dimethylpolysiloxane is used for products that require a light feel with little stickiness, while higher-viscosity dimethylpolysiloxane is used for products that effectively repel water (water-repellent properties). Silicone oil has the property of volatilizing after application, so it is often used in products that require a cooling sensation. Dimethylhydrodiene polysiloxane has also been used to hydrophobize cosmetic powders to improve the longevity of cosmetics.

In general, techniques that effectively utilize the properties of silicone oil are known, and efforts have been made to research and develop applications for cosmetics.

[Problems to be Solved by the Invention] As mentioned above, although silicone oil is important as a cosmetic oil, it often has disadvantages as described below in obtaining desired products with even higher functionality. It was about to be noticed and pointed out.

Silicone oil generally has poor compatibility with other cosmetic oils, and it has been difficult to prepare uniformly dissolved and stable silicone oil-based products. When blending silicone oil, it is difficult to maintain stability even if it is emulsified into an emulsion or mixed with wax or other cosmetic oils. This may lead to separation phenomenon.

This was particularly noticeable when low-viscosity or volatile silicone oils were used extensively to impart a light feel or to increase the longevity of makeup cosmetics. When a high viscosity silicone oil is used, the water repellency improves, but the result is a sticky feeling. In this way, it was difficult to increase the content of silicone oil and obtain a product that was expected to be sufficiently effective and stable.

Furthermore, in conventional silicone oil, yield (n'
Since it does not have i, when used as the main skeleton of cosmetics, it is difficult to stably disperse substances with different specific gravities, such as pigments, over time.

From this point of view, even if a high viscosity product with a large molecular weight is used, it will not be able to retain a material with a large difference in specific gravity, and sedimentation etc. will be observed, and as mentioned above, a sticky feeling will occur, which is undesirable to the touch. On the other hand, when used in combination with waxes, the compatibility is poor and the wax tends to precipitate, and the properties of the wax itself are revealed, impairing the smooth and light feel that is the characteristic of silicone oil as a base for cosmetics. However, it has been difficult to obtain a stable product that takes full advantage of the characteristics of silicone oil. In other words, silicone oil has conventionally been generally used as a liquid oil, and although there is a strong demand for products with structural maintenance properties, it has been difficult to prepare products that fully satisfy this demand. Ta.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present inventors have conducted extensive research and found that by mixing a silicone gel having a three-dimensional structure that is insoluble in silicone oil with a low-viscosity silicone oil, It was discovered that a silicone gel composition that is soft and excellent in stability can be obtained, and furthermore, by incorporating the silicone gel composition, it is possible to obtain a feeling and usability that is stable and has a smooth and light feel. They discovered that excellent cosmetics could be obtained, and based on these findings, they completed the present invention.

That is, the present invention provides (a) formula R2R' S i 051
The molecular chain end is blocked by the unit of 2, and the formula (b) RH3iO
and (c) a unit of the formula R2SiO (in the formula, R may be the same or different and represents an alkyl group or phenyl group having 1 to 4 carbon atoms, and R' represents a hydrogen atom, a hydroxyl group, or an alkoxyl group) ), and contains at least three or more units of the above (b) in one molecule, and the ratio of the units of the above) to the units of (c) is from 1:1 to 1:30. The present invention relates to a silicone gel composition comprising a silicone gel obtained by cross-linking polymerized organohydrodiene polysiloxane and a low-viscosity silicone oil, and a cosmetic containing the silicone gel composition.

The configuration of the present invention will be explained below.

The silicone gel composition of the present invention is composed of a silicone gel insoluble in silicone oil and a low-viscosity silicone oil, and the low-viscosity silicone oil is contained in the silicone gel structure.

The silicone gel insoluble in silicone oil is a polymer obtained by crosslinking organohydrodiene polysiloxane and has a three-dimensional structure.

The organohydrodiene polysiloxane used in the present invention has an R2R' SiO extended unit at the end of the molecular chain, contains at least three RHS iO units in the molecule, and has a combination of RHS iO units and R2SiO units. It is desirable that the ratio of the structural unit to the structural unit is 1:1 to 1:30. That is, RHS i in the molecule
Containing three or more O units is essential for forming a three-dimensional crosslinked polymer, and the RHSiO unit is R2S
When the ratio of iO to the unit of iO becomes large, a hard polymer gel is formed, and the low-viscosity silicone oil, which will be described later, tends to be oriented and separated between crosslinked lattices, causing separation and discharge.

It is now recognized that stability cannot be maintained. Conversely, when the ratio of the RHSiO units to the R2SiO units becomes small, the structural viscosity tends to become poor. Therefore, for the purpose of the present invention to obtain a silicone gel composition that is soft and has good stability, it is preferable, although not limited, to have the above-mentioned proportion of structural units.

The organic group R of the organohydrodiene polysiloxane is an alkyl group having 1 to 4 carbon atoms or a phenyl group, and R' is an R1 hydrogen atom, hydroxyl group or alkoxyl group. An example of such a polysiloxane is dimethylmethylhydrodiene polysiloxane end-capped with a trimethylsilyl group, and any polysiloxane having a molecular weight of about 50,000 or less can be suitably used in the present invention.

The gelation reaction of organohydrodiene polysiloxane in the present invention may be carried out by a conventionally known general method.

For example, the silicone gel insoluble in silicone oil of the present invention can be obtained by heating a suitable organohydrodiene polysiloxane for a predetermined period of time under an alkali catalyst such as potassium hydroxide or sodium hydroxide to carry out a polymerization reaction. .

- The low-viscosity silicone oil used in the strength wood invention is not particularly limited, but any one having a viscosity of about 50C3 or less can be suitably used. This is because as the viscosity increases, as a result of using a large amount, it feels greasy to the touch, which is unfavorable in terms of feel.

Low-viscosity silicone oils include low polymerization degree linear dimethylpolysiloxane, methylphenylpolysiloxane,
Examples include cyclic octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane, and one or more of these may be appropriately selected and used as required.

The silicone gel composition of the present invention can be easily prepared by thoroughly kneading the silicone gel obtained as described above and low-viscosity silicone oil, and swelling the mixture. In this case, the mixing ratio of silicone gel and low viscosity silicone oil is 5:95 to 30:70 by weight. Preferably the ratio is 10:80 to 25:75. This is because when the amount of silicone gel decreases, the low-viscosity silicone oil becomes excessive and becomes fluid viscous, making it impossible to maintain a good gel structure.On the other hand, when the amount increases, it becomes difficult to obtain a soft gel composition.

The silicone gel composition obtained by the present invention described above has good stability, has a soft and light feel, and has excellent usability. By using this silicone gel composition as a raw material for cosmetics in the same way as conventional silicone oils, extremely useful cosmetics exhibiting its properties can be obtained.

Cosmetics used in the present invention include basic cosmetics for the face and hands and feet such as creams and milky lotions, hair cosmetics such as hair styling products, shampoos, and conditioners, foundations, ginseng powder, blush, eye shadow, lipstick, nail polish, etc. The silicone gel composition of the present invention is applicable to any type of makeup cosmetic. The silicone gel composition is formulated into an emulsion and mixed and added in the same manner as other oil raw materials. At this time, the blending amount is in the range of 5 to 100% by weight, and may be used as is or may be determined depending on the purpose of use.

Incidentally, the cosmetic according to the present invention is naturally composed of the silicone gel composition described above and a component that is a conventional cosmetic base material. More specific examples of cosmetic base ingredients include oils and fats, waxy hydrocarbons, fatty acids, higher alcohols, esters, metal soaps, oil ingredients such as silicone oil, white pigments, coloring pigments, and constitution. Powder raw materials such as pigments, surfactants, polyhydric alcohols, polymer compounds, water, other preservatives, alkali agents, ultraviolet absorbers, antioxidants, tar pigments, ingredients for beautiful skin, etc. It is selected as appropriate depending on the person and the purpose of makeup.

[Example] Hereinafter, the present invention will be further explained with reference to Examples.

Note that these do not limit the present invention in any way.

Example [11] Add an appropriate amount of 1% potassium hydroxide solution (ethanol to water = 2 to 1) to trimethylsilyl end-blocked dimethylmethylhydrodiene polysiloxane (molecular weight 2300, CH3H3iO to (CH3)25io = 1 to 4), heat, A polymerization reaction was carried out under reflux to obtain a reaction product. Next, this reaction product was washed with water to remove the alkali agent, and then air-dried to produce a silicone gel insoluble in silicone oil.

After dispersing and mixing 2 parts by weight of this silicone gel and 8 parts by weight of dimethylpolysiloxane (viscosity 6cs), they were sufficiently kneaded,
A silicone gel composition was prepared by swelling.

Example [21] A silicone gel composition was prepared in the same manner as in Example [11] except that trimethylsilyl end-capped dimethylmethylhydrodiene polysiloxane (molecular weight 4800, CH3H3iO to (CH3)25io = 3 to 8.6) was used. It was created.

Comparative Example [1] Trimethylsilyl end-blocked dimethylmethylhydrodiene polysiloxane (min (1i220'o, CH3H3i
A silicone gel composition was prepared in the same manner as in Example [1] except that O vs. (CH3)2 S 1o = 3 vs. 2.6) was used.

Examples [11 and [2] of the present invention created as described above
] The silicone gel composition was a soft gel, spread well, had a light feel, and had excellent stability over time. On the other hand, in comparative example [11],
The resulting silicone gel was hard and had poor miscibility with low-viscosity silicone oil, resulting in liquid waste, making it impossible to create a gel composition with good stability.

Next, examples of cosmetics using the silicone gel composition obtained according to the present invention will be shown.

Example [3] Hwang An Yong (prescription) (parts by weight) (1)
Titanium oxide 14.0 (2) Mica 3.0 (3) Color pigment
3.0 (4) Silicone gel of Example [1] 80.0 Composition (manufacturing method) Components (1) to (3) are mixed and pulverized to make it homogeneous, and this is added and mixed to component (4), After homogeneous dispersion, the product was filled into containers.

Comparative Example [21] A product was obtained in the same manner except that the foundation was replaced with 16 parts of microcrystalline wax and 64 parts of dimethylpolysiloxane (viscosity 60 s) in place of component (4) in Example [11].

The foundations of Example [31] and Comparative Example [21] were subjected to sensory evaluation and stability evaluation over time. The results are shown in Table 1.

The sensory evaluation was conducted using a panel of 20 women, and the evaluation items listed in Table 1 were given 3 points for very good, 2 points for good or fair, and 1 point for poor, with an average score of 2. 5 points or more: ■, 1.5 to less than 2.5 points: Ol
1. Less than 5 points were expressed as ×. In addition, the stability over time was evaluated by visually observing the external appearance one week after being left at room temperature, and good results were expressed as O1 defects were expressed as x.

Table 1 As is clear from the results in Table 1, the foundation of the present invention was superior in feel and usability compared to the comparative amount, and although separation of oily components was observed over time with the comparative amount. On the other hand, the stability was also good. In other words, according to the present invention, a highly useful product with high quality can be obtained without using wax to determine the structural viscosity.

Example [41 Hand cream (prescription) (parts by weight) (1)
Silicone gel of Example [1] 88.0 Composition (2) Octamethylcyclotetra 10.0 Siloxane (3) Vaseline 2.0 (
Manufacturing method) After mixing components (1) to (3), the mixture was thoroughly kneaded to make it homogeneous, and then filled into a container to obtain a product.

The hand cream of Example [4] obtained as described above had a light feel without stickiness, had a high water repellent effect, and was extremely useful.Example [5] Face cream (prescription) ( parts by weight) (1)
Stearic acid 2.5 (2) Cetyl alcohol 1.7 (3) Silicone gel of the present invention 20.0 Composition book (4) Sesquiolein sorbitan 1.0 (5
) Mo/Polyoxyl oleate 2.0 Thyrenesorbicun (6) Triethanolamine 0.7 (7)
1.3-butylene glycol 5.0 (8)
Polymethacrylic liquor 0.5 (8) Purified water Remaining amount Not produced in the same manner as in Example [1] except that octamethylcyclotetrasiloxane was used as the low viscosity silicone oil.

(Manufacturing method) Components (1) to (5) are mixed and heated and dissolved in go'c to form an oil phase component. In addition, components (6) to (9) are mixed,
Heat to 80°C to form an aqueous phase component. The aqueous phase component is added to the oil phase component while stirring, emulsified, and cooled.
A product was obtained by filling a container.

The face cream of Example [51] obtained as described above spreads easily, does not feel greasy to the touch, has a light texture, and has a good feel and usability, and is effective for skin protection. It was useful for this purpose, and also had good stability over time.

[Effects of the Invention] As described in detail in 1.2, the silicone gel composition obtained by the present invention has good stability over time, spreads well, has a light feel with little stickiness, and has a soft texture. It is soft and has excellent usability.

In addition, the silicone gel composition of the present invention can be made into a material with appropriate viscosity, has structural viscosity, and has extremely useful properties such as excellent lubricity, water repellency, and high skin safety. It is.

Therefore, if such a silicone gel composition is used as a material for chemical products, it can be applied to various cosmetics in the same way as conventional silicone oils, and cosmetics exhibiting its unique properties can be obtained.

This means that even when used in large amounts, it does not feel sticky, spreads well and has a light feel, and is also water repellent, providing appropriate moisture and protection to the skin and hair. In addition, it is possible to improve the makeup cosmetics' long-wearing properties.

Furthermore, it is possible to reduce the oiliness of conventional solid or paste-based oil-based cosmetics that mainly contain wax, and it also reduces the oiliness that would otherwise occur when low-viscosity silicone oil is blended into this type of product system. No separation is observed, the stability can be improved, and it can also be applied and developed to silicone-based products with structural viscosity.

As described above, the present invention provides a silicone gel composition that is widely used as a cosmetic material, and a high-quality chemical product that is stable, feels good, and is easy to use by blending the silicone gel composition. This made it possible to provide services for just one fee.

that's all

Claims (2)

[Claims] (1) (a) The molecular chain ends are blocked by units of the formula R_2R′SiO(1/2), (b) units of the formula RHSiO and (c) units of the formula R_2SiO (in the formula, R may be the same or different). Good, carbon number 1~
4 represents an alkyl group or a phenyl group, and R' represents R, a hydrogen atom, a hydroxyl group or an alkoxyl group. ), and contains at least three or more units of the above (b) in one molecule, and the ratio of the units of the above (b) to the units of (c) is from 1:1 to 1:30. A silicone gel composition consisting of a silicone gel obtained by cross-linking polymerization of organohydrogenpolysiloxane and a low-viscosity silicone oil. (2) (a) The molecular chain ends are blocked by units of formula R_2R′SiO(1/2), (b) units of formula RHSiO and (c) units of formula R_2SiO (in the formula, R may be the same or different). Good, carbon number 1~
4 represents an alkyl group or a phenyl group, and R' represents R, a hydrogen atom, a hydroxyl group or an alkoxyl group. ), and contains at least three or more units of the above (b) in one molecule, and the ratio of the units of the above (b) to the units of (c) is from 1:1 to 1:30. A cosmetic containing a silicone gel composition consisting of a silicone gel obtained by cross-linking and polymerizing organohydrogenpolysiloxane and a low-viscosity silicone oil.