JPH01207354A - Silicone gel composition and cosmetic containing said composition - Google Patents

Abstract

PURPOSE:To obtain a silicone gel composition capable of providing a soft cosmetic excellent in stability and further smooth and refreshing feeling of use, usability and stability with time, by blending a specific organopolysiloxane polymer with a low-viscosity silicone oil. CONSTITUTION:A composition obtained by blending (A) 5-30wt.%, preferably 10-25wt.% organopolysiloxane polymer prepared by addition reaction of (A1) an organohydrogenpolysiloxane containing >=2 hydrogen atoms linked to silicon atom in one molecule with (A2) organopolysiloxane containing >=2 aliphatic unsaturated groups linked to silicon atom in one molecule with (B) 95-70wt.%, preferably 90-75wt.% low-viscosity silicone oil (e.g., dimethyl polysiloxane of a low polymerization degree) having <=50cSt viscosity.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a silicone gel composition comprising a specific organopolysiloxane polymer and a low-viscosity silicone oil, and a cosmetic containing the same. is a soft and stable silicone gel composition that is particularly useful as a material for cosmetics, and by incorporating it, it has a smooth and light texture, is easy to use, and is safe and has excellent stability over time. The purpose is to provide highly functional 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, by incorporating and utilizing silicone oil, we are considering commercializing basic cosmetics and hair cosmetics that have a good feeling of use, treat and protect the skin and hair, or make-up cosmetics that have good makeup durability. It has been done.

Normally, what is the amount of silicone oil for cosmetics? lil
, linear dimethylpolysiloxane with different viscosities as representative examples, cyclic octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, methylphenylpolysiloxane, methylhydrodienepolysiloxane, and various other types. Polymerized/copolymerized products and modified products are commercially available.

These various silicone oils are used differently or in combination depending on cosmetic purposes and expected effects. For example, low-viscosity dimethylpolysiloxane is used for products that require a light feel with little stickiness, while high-layer viscosity products are used for products that effectively remove water and have cold water properties. Volatile silicone oil has the property of volatilizing after application, so it is often used in products that require a refreshing feeling. Additionally, dimethylhydrodiene polysiloxane has been used to hydrophobize cosmetic powders to improve the longevity of makeup 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.

[Problem to be solved by the invention] As described in 1 f, silicone oil is important as an oil for cosmetics, but in order to obtain desired products with improved layer functionality, there are certain issues as described below. This was often seen as an inconvenience and was even 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, and sometimes it is difficult to effectively demonstrate the properties of silicone oil. This may lead to a separation phenomenon over time.

This is particularly noticeable when low-viscosity or volatile silicone oils are used extensively to provide a light feel or to increase the longevity of makeup cosmetics. When a high viscosity silicone oil is used, the cold water properties are improved, but the result is a sticky feeling. In this way, the silicone oil content 11[
It took a lot of effort to increase the number of products that were expected to be effective and to obtain a stable product.

Furthermore, 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 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, a product with a large difference in ratio [n] cannot be maintained, sedimentation etc. are observed, and as mentioned above, it is undesirable in terms of stickiness or raw texture. 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 generally been used as a liquid oil agent, and although there is a strong demand for products with structural maintenance properties, it is difficult to prepare products that meet this demand. Ta.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present inventors have conducted intensive research and found that organopolysiloxane polymerization which is insoluble in silicone oil but has a three-dimensional crosslinked structure that swells. It has been found that a soft and extremely stable (i, 1-L) silicone gel composition can be obtained by mixing a silicone gel composition with a low viscosity silicone oil. It was discovered that by applying this method, a cosmetic with excellent stability, a smooth and light feel, and excellent usability can be obtained, and based on these findings, the present invention was completed.

That is, the present invention provides (aH-n) an orkahydrodiene polysiloxane containing at least two hydrogen atoms bonded to a silicon atom in one molecule, and (0) an aliphatic unsaturated group bonded to a silicon atom in one molecule. This invention relates to a silicone gel composition comprising an organopolysiloxane polymer obtained by addition reaction with an organopolysiloxane containing at least two fb) and a low-viscosity organopolysiloxane, and a cosmetic containing the silicone gel composition. be.

The configuration of the present invention will be explained below.

The silicone gel composition of the present invention is composed of an organopolysiloxane polymer that is insoluble in silicone oil but swells sufficiently, and a low-viscosity silicone oil. Contains oil.

The organopolysiloxane polymer that is insoluble or sufficiently swells in silicone oil is a polymer obtained by addition polymerizing an organohydrodiene polysiloxane and an aliphatic unsaturated group-containing organopolysiloxane. It has a three-dimensional crosslinked structure.

The organohytrodiene polysiloxane used in the present invention includes 1lsi [], , , units, 5 units of 11si, old 1siO units, R25iOr11-position 1 (2
It consists of 1131005 units, R35IOo, s units, etc., and its molecular structure may be straight, branched, or cyclic, and each molecule contains at least a hydrogen atom -t bonded to a silicon atom. It contains two pieces.

The organohydrodiene polysiloxane used in the present invention is preferably linear in order to control the organopolysiloxane polymer synthesis reaction.

In addition, the hydrogen atoms bonded to the silicon atoms (ii:5ill bond) in this organohydrodiene polysiloxane are generally considered to be included in the molecular chain,
The terminus of the molecular chain may be used, and the total number of 5ill bonds is usually 1 to 5ill when the molecular structure is linear or branched.
In the case of a cyclic type, the amount is preferably 20 mol%, and in the case of a cyclic type, it is preferably 1 to 50 mol%, and the organic groups other than the 5ill bond are preferably 50 mol% or more or methyl groups.

The aliphatic unsaturated group-containing organopolysiloxane used at the same time contains at least two aliphatic unsaturated groups bonded to silicon atoms in one molecule. Examples of this organopolysiloxane include vinyl groups, aryl 7, and H, but vinyl group-containing organovinylpolysiloxanes are generally exemplified, and organovinylpolysiloxanes include (elf2-(:It)Si
O,-.

Unit, R51O+ s unit, R(C11<I+2n Si
O unit, 1 (2SiO unit, R2 (elf-C112)
It consists of SiOo, s-4' position, R35IOo5 units, etc., and its molecular structure may be straight, branched, or cyclic, and each molecule contains an aliphatic unsaturated group bonded to a silicon atom. , for example, one containing at least two vinyl groups. The aliphatic unsaturated group-containing organopolysiloxane used in the present invention is preferably linear in order to control the organopolysiloxane polymer synthesis reaction. Furthermore, this organovinylpolysiloxane is usually considered to be a linear one with both ends of the molecular chain blocked by dimethylvinylsilyl groups, but this vinyl group may be included in tn, and this vinyl group! 1;
is 1 to 20 if the molecular structure is linear or branched.
In the case of a cyclic type, it is preferably 1 to 50 mol%, and the organic group other than the vinyl group is preferably 50 mol%.
It is preferable that at least -42 by mole is a methyl group.

In each molecule of organobite polysiloxane and aliphatic unsaturated group-containing organopolysiloxane, such as organovinyl polysiloxane, hydrogen atoms or vinyl groups bonded to silicon atoms, which are reactive groups, are present in each molecule. Containing at least two of these is essential for the addition polymer of both to form a three-dimensional structure in part. In addition, if the content of each of these reactive groups in the organopolysiloxane exceeds 20 mol% in the case of a linear or branched molecular structure, or 50 mol% in the case of a cyclic one, a hard polymer is formed. At the same time, the low viscosity silicone oil described below tends to become difficult to orient between the three-dimensional crosslinked lattices, causing separation and discharge and making it impossible to stably maintain the oil. Conversely, if the content is less than 1 mol%, the structural viscosity tends to be poor. For this reason, although not limited to the purpose of the present invention to obtain a silicone gel composition that is soft and has good stability, the content of reactive groups is 1 to 20 if the molecular structure is linear or branched. mol%, and in the case of cyclic ones, it is 1 to 50 mol%.

In addition, the organic group R of the organohydrodiene polysiloxane is an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, an aryl group such as a phenyl group or a tolyl group, a cyclohexyl group, or the carbon of these groups. Unsubstituted or substituted-valent hydrocarbon groups, excluding aliphatic unsaturated groups such as vinyl groups, selected from groups in which some or all of the hydrogen atoms bonded to atoms are substituted with halogen atoms, cyano groups, etc. Things are exemplified.

A typical example of this is (CII3):+5iO-1f (C;113) 2S
iO),,(elf3IISiO)9.5i(CII
+) z (however, p-10 to 500, q-2 to 50), and is a suitable material for the present invention.

Further, the organic group R of organovinylpolysiloxane, which is an aliphatic unsaturated group-containing organopolysiloxane, is the same as R of organohydrodiene polysiloxane. A typical example of this is (Cl12=
CH) (CI+3)25iO-5NCII3)2Si
O+,, -5i (CH3)z (CI=C112),
(However, the unit of r=10~100) is (cu
3) 3sro-1f(C11,)2SiO),,,f(
(:H-CJ) CII3StO). , -5i ((:H
3) 3, (however, m=10~500, n・2~50)
Examples include methylvinylpolysiloxane containing units of , which may be a mixture, and are suitable materials for the present invention.

The addition reaction between the organohydrodiene polysiloxane and the aliphatic unsaturated group-containing organopolysiloxane of the present invention is as follows:
This may be carried out by a conventionally known general method. For example, the molar ratio of the silicon-bonded hydrogen group to the vinyl group in the corresponding organohydrodiene polysiloxane and organovinyl polysiloxane is 173 to 3/3.
After blending in the range of 1, an additional fi synthesis catalyst such as platinum or palladium is added, and the mixture is heated and stirred to easily obtain the target luganoborisiloxane polymer which is insoluble in silicone oil. In particular, as the wood addition polymerization catalyst, it is preferable to use chloroplatinic acid described in Japanese Patent Publication No. 13-9969.

On the other hand, the low-viscosity silicone oil used in the present invention is not particularly limited, but any one having a viscosity of about 50 cs 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 organopolysiloxane polymer obtained as described above and a low-viscosity silicone oil to swell the composition. . In this case, the mixing ratio of organopolysiloxane 1 [compound and low viscosity silicone oil is 5:95 to 30]
70% by weight of IO, preferably 90-25% by weight of IO.

This is because if the amount of the organopolysiloxane polymer decreases, the low-viscosity silicone oil becomes excessive and becomes fluid viscous, making it impossible to maintain a good gel structure, and conversely, if the amount increases, it becomes difficult to obtain a soft gel composition.

The silicone gel composition obtained according to the present invention has excellent retention of low viscosity silicone oil, and
It 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 emulsions, hair cosmetics such as hair styling products, shampoos, and conditioners, foundations, white powders, blushers, eye shadows, lipsticks, nail products, etc. The makeup cosmetic may be any makeup cosmetic as long as it is applicable to the silicone gel composition of the present invention. 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, as a matter of course, composed of 1) the silicone gel composition η and components that are conventional cosmetic base materials. More specific examples of cosmetic base ingredients include oils and fats, waxes, 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. Appropriate selection is made depending on the species and cosmetic purpose.

[Actual hζ 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] 1790 g of trimethylsilyl end-capped dimethyl methylhydrodiene polysiloxane (average molecular i 23/10, S i -H4, 5 mol %) and dimethylvinylsilyl end-capped dimethyl 710 g of polysiloxane (average molecular weight 930, vinyl group 7.7 mol %) was added and mixed with stirring.

To the same mixed solution, 0.5 g of a 2% isopropanol solution of chloroplatinic acid was added, the temperature was raised to 70 to 80°C, and stirring was continued for 2 hours. Thereafter, the system was incubated for 5 to 5 hours. The resulting organopolysiloxane polymer was a white, flexible powder.

141 parts of this organopolysiloxane polymer duplex and 8 parts by weight of dimethylpolysiloxane (viscosity: 5 cs) were dispersed and mixed, thoroughly kneaded using three rolls, and swollen to prepare a silicone gel composition.

Example [2] In the same manner as in Example [1], dimethylhydrodienesilyl end-capped dimethylpolysiloxane (average molecular weight 1i
2720, 5i-112,6-C-jlz%) 88
0g to trimethylsilyl end-capped dimethylmethylhinylborisiloxane (average molecular 'ft5000, vinyl group
1.5 mol%) was blended with 1,620 g of chloroplatinic acid.
A silicone gel composition was prepared by adding 0.5 g of % impropatol solution and performing the same procedure.

Example [:l] Methyl hydroxycyflobutrasiloxane (average outside 74;:232.5i-It) was prepared in the same manner as in Example [1].
50 mol%) to 55 g of dimethylvinylsilyl end-capped dimethylpolysiloxane (average outer Fj', 14400
, hinyl, j, II, 1.3 mol%) 2200g
and 2% isopropanol solution of chloroplatinic acid.
．． A silicone gel composition was prepared by adding 5 g and performing the same operation.

Comparative Example [1] Trimethylsilyl end-capped dimethylmethylhytrodiene polysiloxane (molecular weight 2200.5i-If 2
4 mol%) to 1100 g of trimethylsilyl end-blocked dimethylmethylvinyl polysiloxane (average molecular weight
278 [ ], vinyl group 21 mol %), and 5 g of 2% isopropanol solution of chloroplatinic acid.
A silicone gel composition was prepared in the same manner as in Example 1.

Example [l] of the present invention prepared as in [2] above.

The silicone shell compositions [2] and [3] were soft shells, had a smooth and light feel, and had excellent stability over time. On the other hand, comparative example [+
], the organopolysiloxane polymer obtained therein is hard and has poor miscibility with low-viscosity silicone oil, resulting in a liquid waste phenomenon, making it difficult to create a gel composition with good stability. I couldn't come.

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

Example [4] Foundation (prescription) (f [Okibe) (1) Titanium oxide 14.0 (2) Mica 3.0 (3) Colored r
N material 3゜(4) Actual h&i example [+1 silicone gel 800 composition (manufacturing method) Components (1) to (3) are mixed and pulverized to make it homogeneous, and this is added to component (4) and mixed to make it homogeneous. After being dispersed, the product was filled into containers.

Comparative Example [2] A product of 11? Ta.

A sensory evaluation and an evaluation of stability over time were conducted on the Fanchi Johns of Example [4] and Comparative Example [2] obtained as described above. The results are shown in Table 1.

The sensory 61 value was evaluated using a panel of 20 women, and the evaluation items listed in Table 1 were scored as 3 points for very good, 2 points for good or fair, and 1 point for poor, and the average score for each was A score of 2.5 or more was indicated as ◎, a score of 1.5 to less than 2.5 was indicated as ◯, and a score of less than 1.5 was indicated as ×. In addition, the stability over time was evaluated by visually observing the external appearance after one week after being left at room temperature.

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

Example [5] Hand cream (prescription) (parts by weight) (+)
Silicone gel of Example [1] 88.0 Composition (2) Octamethyl cyclotetra 10.0 Siloxane (3) Vaseline 2.0 (
Manufacturing method) Ingredients (1) to (3)? After mixing, thoroughly knead to a uniform consistency of 7'1
The person who did it, filled 8 Homare and made 4JL of the product.

The hunt cream of Example [5] prepared as described above has a light feel without stickiness, has a high water repellent effect, and has good stability over time, making it extremely useful. It was something.

Example [6] Face cream (prescription) (heavy product) (1)
Stearic acid 2.5 (2) Cetyl alcohol 1.7 (3) Silicone gel of the present invention 20.0 Composition book (4) Sorbitan sesquioleate 1.0 (5
) Monooleic acid polyoxye 2.0 tyrene sorbitan (6) triethanolamine 0.7 (7)
l,:1-butylene glycol 5.0 (8
) Polymethacrylic acid 0.5 (9) grain ice making Remaining amount * It was made 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 at 80°C to obtain an oil phase component. In addition, components (6) to (9) were mixed and heated to 80°C.
Heat to form an aqueous phase component. The aqueous phase component was added to the oil phase component while stirring, emulsified, cooled, and then filled into a container to obtain a product.

The face cream of Example [6] obtained as described above spreads easily, does not feel greasy to the touch, has a light texture, and has good usability and skin protection. It was useful for this purpose and also had good stability over time.

[Effects of the Invention] As detailed above, the silicone gel composition obtained by the present invention has very good stability over time, and has good spreadability and a light feel with little flattening. ,
It is soft and easy to use.

In addition, the silicone gel composition of the present invention can be made into a moderately viscous material, 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 cosmetics, 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 if you use it for a long time, you won't feel any stiffness, it will spread well and have a light feel, and it is also water repellent, and has an appropriate amount of retention and protection effect on the skin and hair. In addition, it is possible to improve the longevity of makeup cosmetics.

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

As described above, the present invention provides a silicone gel composition that is widely used as a cosmetic material, and a high-quality cosmetic that has good stability, feels good, and is easy to use by incorporating the silicone gel composition. It became a noh event.

-F Applicant Kobayashi Kose Co., Ltd. Director General of the Patent Office 1.4S Indication Patent Application No. 20036 of 1988 2 Title of Invention Silicone Gel Composition and Cosmetics Containing the Same 3 Amendment Patent applicant address: 3-6-2-4, Nihonbashi, Chuo-ku, Tokyo, date of amendment order: 5, “Claims” and “Details of the invention,” 6. Contents (1) The scope of claims in the specification is corrected as shown in the attached sheet.

(2 Specification, page 7, line 16, ``Low viscosity organopolysiloxane'' is corrected to ``Low viscosity silicone oil.''

Claims ■ (Darkness (a) Organohydrodiene polysiloxane containing at least two hydrogen atoms bonded to silicon atoms in one molecule; (b) Aliphatic unsaturated group bonded to silicon atoms in one molecule A silicone gel composition comprising: (b) silicone';

2. A cosmetic containing the silicone gel composition according to claim 1.

Claims (1)

[Scope of Claims] 1(a) (a) an organohydrodiene polysiloxane containing at least two hydrogen atoms bonded to a silicon atom in one molecule; and (b) an aliphatic compound bonded to a silicon atom in one molecule. A silicone gel composition comprising: (b) a low-viscosity organopolysiloxane; and (b) a low-viscosity organopolysiloxane. 2. A cosmetic containing the silicone gel composition according to claim 1.