JPH086035B2 - Silicone gel composition and cosmetics containing the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a silicone gel composition comprising a specific silicone polymer and a low-viscosity silicone oil, and a cosmetic containing the same, more specifically, a soft gel composition. And highly stable silicone gel composition, which is particularly useful as a cosmetic material, and by containing it, it has a smooth and refreshing feel, excellent usability, usability, and stability over time, and high safety. The purpose is to provide cosmetics.

[Prior Art] Conventionally, silicone oil has been applied to various products due to its excellent properties, and is generally used as a useful oil agent component particularly in cosmetics. This means that the silicone oil has suitable characteristics or conditions such as low stickiness, smoothness, good elongation, a refreshing feel, rich lubricity and water repellency, tasteless and odorless, and high skin safety. This is because Therefore, it is considered to commercialize basic cosmetics and hair cosmetics that have a good feeling of use by blending and utilizing silicone oil and treat and protect the skin and hair, or makeup cosmetics with good makeup lasting. Came.

In general, such cosmetic silicone oils are represented by chain-like dimethylpolysiloxanes having different molecular weights and viscosities,
Examples thereof include cyclic octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane, and various other polymerization / copolymer products and modified products are commercially available.

These various silicone oils are used or used in combination in consideration of cosmetic purposes and expected effects. For example, low-viscosity dimethylpolysiloxane is applied to products that are required to have a refreshing feel with little stickiness, and higher-viscosity dimethylpolysiloxane is applied to products that have water repellency that effectively repels water,
Furthermore, since chain-like and cyclic volatile silicone oils have the property of volatilizing after application, they are often used for products requiring a refreshing feeling. Further, dimethylhydrogenpolysiloxane has been used to improve the makeup lasting property of makeup cosmetics by utilizing it for the hydrophobic treatment of cosmetic powders.

In general, techniques for effectively utilizing such characteristics of silicone oil have been known, and efforts have been made to research and develop applications for cosmetics.

[Problems to be Solved by the Invention] As described above, although silicone oil is important as an oil agent for cosmetics, there are often inconveniences as described below in obtaining expected products having higher functionality, It was about to be done.

Silicone oils generally have poor compatibility with other cosmetic oils, making it difficult to prepare a product based on a homogeneously dissolved and stable silicone oil. When silicone oil is blended, it is difficult to maintain it stable even when emulsified to form an emulsion and mixed with wax and other cosmetic oils.
At times, if a large amount is contained in order to effectively exhibit the characteristics of the silicone oil, a separation phenomenon may occur over time. This was particularly noticeable when a low-viscosity or volatile silicone oil was used in a large amount in order to impart a refreshing feel and to enhance the makeup lasting property of makeup cosmetics. When a high-viscosity silicone oil is used, the water repellency is improved, but a sticky feeling or the like is simultaneously felt. It has been difficult to increase the content of such silicone oil, expect a sufficient effect, and obtain a stable product.

In addition, since conventional silicone oils do not have a yield value as a flow characteristic, when used as the main skeleton of cosmetics, it is difficult to stably disperse substances having a specific gravity difference such as pigment over time.

From this point of view, even if a high-viscosity product having a large molecular weight is used, a product having a large difference in specific gravity cannot be retained, sedimentation and the like are observed, and as described above, a sticky feeling occurs, which is not preferable in terms of feel. On the other hand, when used in combination with waxes, the compatibility is poor and the wax is likely to precipitate, and the properties of the wax itself appear. However, it has been difficult to obtain a product with good stability that fully utilizes the characteristics of silicone oil. That is, silicone oils have conventionally been generally used as liquid oil agents, and despite the strong demand for products having a structure-maintaining property, it is difficult to prepare products that meet this requirement and that are sufficiently satisfactory. Was.

[Means for Solving the Problems] The inventors of the present invention have conducted intensive studies in view of the above-mentioned circumstances, and as a result, have found that the silicone polymerization is insoluble in benzene but has a three-dimensional crosslinked structure that can contain benzene in the same amount or more. It was found that a soft and excellent silicone gel composition can be obtained by mixing a silicone oil composition and a low-viscosity silicone oil. Furthermore, by incorporating the silicone gel composition, stability and smoothness and refreshing are obtained. It was found that a cosmetic having excellent feeling in use and usability can be obtained, and the present invention has been completed based on these findings.

That is, the present invention is insoluble in benzene, but may contain the same weight or more of benzene as its own weight, R ₂ SiO units and R SiO _1.5
A silicone polymer having a three-dimensional crosslinked structure having a unit ratio of 1 to 30: 1 and a low-viscosity silicone oil of 50 cs or less, and the weight ratio of the silicone polymer to the low-viscosity silicone oil is 5: The present invention relates to a silicone gel composition characterized by being 95 to 30:70, and a cosmetic containing the silicone gel composition.

 The configuration of the present invention will be described below.

The silicone gel composition of the present invention comprises a silicone polymer having a three-dimensional crosslinked structure which is insoluble in benzene but can contain benzene in an amount equal to or more than its own weight, and a low-viscosity silicone oil. Low viscosity silicone oil is mixed in.

Such a silicone polymer having a three-dimensional crosslinked structure which is insoluble in benzene and may contain benzene in the same weight as or more than its own weight is a polymer obtained by cross-linking an organopolysiloxane, and partially has a three-dimensional crosslinked structure. Having R ₂ SiO units and R SiO _1.5 units, R ₃ SiO _0.5 units and / or S
It may contain iO ₂ units.

Examples of R of each structural unit described above include a hydrogen atom, an alkyl group such as a methyl group, an ethyl group and a propyl group, an aryl group such as a phenyl group and a tolyl group, and an aliphatic unsaturated group such as a vinyl group. The same kind or different kinds may be used.

Organopolysiloxane is insoluble in benzene, but in order to have a silicone polymerized structure having a three-dimensional crosslinked structure that can contain benzene in an amount equal to or more than its own weight, RSiO is used.
It is necessary that the ratio of _1.5 units and SiO ₂ units to R ₂ SiO units and R ₃ SiO _0.5 units is in an appropriate range. If the ratio of R SiO _1.5 units and SiO ₂ units becomes small, the organopolysiloxane will be sufficient. It does not have a three-dimensional crosslinked structure and is soluble in benzene, and even if it has an apparent crosslinked structure, it cannot be used in the present invention.

In addition, in comparison with R ₂ SiO unit and R ₃ SiO _0.5 unit, RSiO _1.5
If there are too many units and SiO ₂ units, the organopolysiloxane has a strong cross-linked structure and benzene is insoluble,
The polymer contains benzene in an amount less than its own weight, and when mixed with a low-viscosity silicone oil, it causes separation and discharge, and cannot be used in the present invention.

R ₂ in the silicone polymer used in the present invention, which is insoluble in benzene and may contain benzene in an amount equal to or more than its own weight
The ratio of the SiO unit to the RSiO _1.5 unit is largely influenced by the molecular weight of the entire silicone polymer, and it is difficult to strictly define it, but 1
A ratio of ~ 30: 1 gave desirable results in the practice of the invention. When the RSiO _1.5 unit is more than this ratio, it becomes a hard silicone polymer and can contain less than the same weight of benzene as its own weight, and this silicone polymer swells sufficiently when mixed with a low viscosity silicone oil described later. Instead, the silicone oil will be separated and discharged, making it impossible to maintain stability. On the contrary, when the R ₂ SiO unit exceeds the above range, the structural viscosity becomes poor and the features of the present invention are not exhibited. Therefore, for the purpose of the present invention to obtain a silicone gel composition which is soft and has good stability, it is necessary that the ratio of the structural units is within the above range.

The silicone polymer of the present invention, which is insoluble in benzene but has a three-dimensional crosslinked structure which can contain benzene in an amount equal to or more than its own weight, can be synthesized by various methods.

It is also possible to carry out a dehydrogenation reaction and a condensation reaction by adding a catalytic amount of an alcoholic aqueous solution of an alkali metal hydroxide to an organohydrogenpolysiloxane having at least two hydrogen atoms bonded to silicon atoms in one molecule and heating it. One way.

A catalytic amount of an organohydrogenpolysiloxane having a hydrogen atom bonded to at least two silicon atoms in one molecule and an organopolysiloxane having a hydroxyl group bonded to at least two silicon atoms in the other molecule in a catalytic amount Heated to the presence of things and platinum compounds,
One method is to carry out a dehydrogenative condensation reaction.

One method is to heat the organopolysiloxane having a hydroxyl group directly bonded to at least two silicon atoms in one molecule in the presence of a catalytic amount of an alkali metal hydroxide or an organic tin compound to carry out the dehydration condensation reaction.

A catalytic amount of an alkali metal hydroxide having an organopolysiloxane having a hydroxyl group directly bonded to at least two silicon atoms in one molecule and an organopolysiloxane having an alkoxy group bonded to at least two silicon atoms in the other molecule. It is also one method to carry out dealcoholization reaction by heating in the presence of or an organometallic tin compound, and any method is insoluble in benzene of the present invention, but can contain benzene in the same weight or more as its own weight. A silicone polymer having an original crosslinked structure can be easily obtained.

On the other hand, as the low-viscosity silicone oil used in the present invention, those having a viscosity of 50 cs or less can be suitably used. This is because, as the viscosity increases, a large amount of it is used, resulting in a feeling of oiliness, which is not preferable in terms of usability. Examples of the low-viscosity silicone oil include low-polymerization degree chain dimethylpolysiloxane, methylphenylpolysiloxane, cyclic octamethylcyclotetrasiloxane, and decamethylcyclopentasiloxane.
One or more of these may be appropriately selected and used as needed.

The silicone gel composition of the present invention can be easily prepared by sufficiently kneading the silicone polymer obtained as described above and a low-viscosity silicone oil and swelling them.
In this case, the mixing ratio of the silicone polymer and the low-viscosity silicone oil is 5:95 to 30:70 by weight, preferably 10:90.
~ 25 to 75. This is because when the amount of the silicone polymer is small, the low-viscosity silicone oil becomes excessive, and it becomes impossible to maintain a good gel structure with flow viscosity, and when the amount is large, it becomes difficult to obtain a soft gel composition.

The above-mentioned silicone gel composition obtained by the present invention is excellent in stability, soft and refreshing feeling, and is excellent in usability and usability. By using this silicone gel composition as a raw material for cosmetics in the same manner as conventional silicone oils, extremely useful cosmetics exhibiting its properties can be obtained.

As the cosmetics in the present invention, a face such as cream / milky lotion,
Basic cosmetics for limbs, hair cosmetics such as hair styling, shampoo, and rinse, makeup cosmetics such as foundation, white powder, blush, eyeshadow, lipstick, and beautiful nails, which are the silicone gel composition of the present invention. It does not matter which one is applicable. The silicone gel composition is blended in the form of an emulsion and mixed and added in the same manner as the other oil agent raw materials. In this case, the compounding amount is in the range of 5 to 100% by weight, and it may be used as it is or may be determined according to the purpose of use.

The cosmetic in the present invention is naturally composed of the above-mentioned silicone gel composition and a conventional cosmetic base material. More concrete examples of the base material for cosmetics include oils, waxes, hydrocarbons, fatty acids, higher alcohols, esters, metal soap, silicone oil, and other raw materials for oil agents, white pigments, colored pigments, and constitutions. Powder raw materials such as pigments, surfactants, polyhydric alcohols, polymer compounds, water and other preservatives, alkali agents, ultraviolet absorbers, antioxidants, tar dyes, skin-care ingredients, etc. It is appropriately selected depending on the seed and the purpose of makeup.

[Examples] Hereinafter, the present invention will be further described with reference to examples. These do not limit the present invention at all.

Example [1] trimethylsilyl endblocked dimethyl methylhydrogen polysiloxane "molecular weight 2300, CH ₃ HSiO pairs (CH _{3) 2} SiO
= 1: 4 (molar ratio) >>, an appropriate amount of a 1% potassium hydroxide solution (ethanol: water = 2: 1) was added, heated and refluxed to carry out a polymerization reaction to obtain a reaction product. Then, this reaction product is washed with water to remove the alkaline agent, and then naturally dried to be insoluble in benzene and
% Silicone polymer was prepared.

2 parts by weight of this silicone polymer and 8 parts by weight of dimethylpolysiloxane (viscosity 5 cs) were dispersed and mixed, and then sufficiently kneaded with a three-roll and swollen to prepare a silicone gel composition.

Example [2] trimethylsilyl endblocked dimethyl methylhydrogen polysiloxane "molecular weight 4800, CH ₃ HSiO pairs (CH _{3) 2} SiO
= 3: 9.6 (molar ratio) >> was used, and a silicone polymer was produced in the same manner as in Example [1].

The obtained silicone polymer was insoluble in benzene and could contain benzene at 130% of its own weight.

2 parts by weight of this silicone polymer and 8 parts by weight of dimethylpolysiloxane (viscosity 5 cs) were dispersed and mixed, and then sufficiently kneaded by a three-roll and swollen to prepare a silicone gel composition.

Comparative Example [1] trimethylsilyl endblocked dimethyl methylhydrogen polysiloxane "molecular weight 2200, CH ₃ HSiO pairs (CH _{3) 2} SiO
= 3: 2.6 (molar ratio) >> was used and a silicone polymer was produced in the same manner as in Example [1].

The obtained silicone polymer was a relatively hard and brittle silicone polymer which could contain only 60% by weight of benzene. Using this silicone polymer, a silicone gel composition was prepared in the same manner as in Example [1].

The silicone gel compositions of Examples [1] and [2] of the present invention prepared as described above are soft gels,
It had good elongation, a refreshing feel, and excellent stability over time.

On the other hand, in Comparative Example [1], the silicone gel obtained there was hard, and the miscibility of the silicone gel with low-viscosity silicone oil was poor. The product could not be prepared.

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

Example [3] Foundation (prescription) (parts by weight) 1. Titanium oxide 14.0 2. Mica 3.0 3. Color pigment 3.0 4. Silicone gel composition 80.0 of Example [1] (production method) Mix components 1 to 3, Grind to homogeneity and add this to ingredient 4
Was added to and mixed with, and homogeneously dispersed, and then filled in a container to obtain a product.

Comparative Example [2] Foundation As an alternative to the silicone gel composition of Example [1] which is Component 4 of Example [3], except that 16 parts of microcrystalline wax and 64 parts of dimethylpolysiloxane (viscosity 5cs) were substituted. A product was obtained in the same manner.

The foundations of Example [3] and Comparative Example [2] obtained as described above were subjected to sensory evaluation and stability evaluation with time. The results are shown in Table 1.

The sensory evaluation was carried out by using 20 female panelists, and the evaluation items listed in Table 1 were evaluated as 3 points for very good, 2 points for good or normal, and 1 point for bad, and the average score of each was 2.5 points. The above was represented by ⊚, 1.5 to less than 2.5 points by ◯, and less than 1.5 points by x. In addition, the stability with time is evaluated by visually observing the appearance state after 1 week at room temperature.
Good was represented by ○ and bad was represented by ×.

As is clear from the results shown in Table 1, the foundation of the present invention is superior in feeling of use and usability as compared with the comparative product, and in the comparative product, separation of the oily component was observed with time. The stability was also good. That is, according to the present invention, a high quality and extremely useful product was obtained without using a wax for imparting structural viscosity.

Example [4] Hand cream (prescription) (parts by weight) 1. Silicone gel composition of Example [1] 88.0 2. Octamethylcyclotetrasiloxane 10.0 3. Vaseline 2.0 (production method) After mixing components 1 to 3, After thoroughly kneading and homogenizing, the product was filled in a container.

The hand cream of Example [4] obtained as described above was extremely useful because it had a non-sticky feel, a refreshing feel, and a high water repellency effect.

Example [5] Face cream (prescription) (parts by weight) 1. Stearic acid 2.5 2. Cetyl alcohol 1.7 3. Silicone gel composition of the present invention * 20.0 4. Sorbitan sesquioleate 1.0 5. Polyoxyethylene monooleate Sorbitan 2.0 6. Triethanolamine 0.7 7.1,3-butylene glycol 5.0 8. Polymethacrylic acid 0.5 9. Purified water Remaining amount * Except that octamethylcyclotetrasiloxane was used as the low viscosity silicone oil in Example [1]. Was similarly prepared.

(Manufacturing method) Components 1 to 5 are mixed and dissolved by heating at 80 ° C to obtain an oil phase component. Further, the ingredients 6 to 9 are mixed and heated to 80 ° C. to obtain an aqueous phase ingredient. Add the water phase component to this oil phase component while stirring,
After emulsification and cooling, the product was filled in a container.

The face cream of Example [5] obtained as described above has good spreadability, feels no oily feel, is refreshing, and has a good feeling of use and usability for skin protection. Therefore, it was useful, and the stability over time was good.

[Effects of the Invention] As described in detail above, the silicone gel composition obtained by the present invention has good stability over time, has good elongation, is less sticky, has a refreshing feel, and is soft and soft in use. It has excellent properties.

Further, the silicone gel composition of the present invention has an extremely useful property such that it can be made into a moderately viscous substance and has a structural viscosity, and further, it has excellent lubricity and water repellency and high skin safety. It is a thing.

Therefore, if such a silicone gel composition is used as a cosmetic material, it can be applied to various cosmetics in the same manner as the conventional silicone oil, and a cosmetic exhibiting its unique performance can be obtained.

This means that even if it is used in a large amount, it does not feel sticky, it has a good stretch and has a refreshing feeling of use, and it also has water repellency, and can give a proper moisturizing and protective effect to the skin and hair, Furthermore, the makeup lasting effect of makeup cosmetics can be improved.

Moreover, in the solid or pasty oily cosmetics mainly composed of wax, the oiliness can be reduced, and the separation of the oil agent, which is the case when a low-viscosity silicone oil is blended in this type of product system, is also possible. It is possible to improve stability and apply and develop it to products based on silicone having structural viscosity.

As described above, according to the present invention, a silicone gel composition having a high degree of use as a cosmetic material, and a high-quality cosmetic composition having excellent stability, excellent usability and usability by blending the silicone gel composition. Is now possible.

Claims (2)

[Claims] 1. A silicone polymer having a three-dimensional crosslinked structure, which is insoluble in benzene but may contain benzene in an amount equal to or more than its own weight and having a ratio of R ₂ SiO units to RSiO _1.5 units of 1 to 30: 1. And low viscosity silicone oil of 50cs or less,
Further, the silicone gel composition is characterized in that the weight ratio of the silicone polymer to the low-viscosity silicone oil is 5:95 to 30:70. 2. A silicone polymer having a three-dimensional crosslinked structure, which is insoluble in benzene but may contain benzene in an amount equal to or more than its own weight and having a ratio of R ₂ SiO units to RSiO _1.5 units of 1 to 30: 1. And low viscosity silicone oil of 50cs or less,
Further, a cosmetic comprising a silicone gel composition in which the weight ratio of the silicone polymer to the low-viscosity silicone oil is 5:95 to 30:70.