JPS59172495A - Polysiloxane and compounded cosmetic thereof - Google Patents

Abstract

PURPOSE:A polysiloxane composition, containing a high-molecular weight dimethylpolysiloxane without the above-mentioned compound of a low molecular weight, having a low viscosity, and suitable for use as a solid cosmetic without irritation to the skin, etc., and extremely safe for the human body. CONSTITUTION:A composition, containing a high-molecular weight dimethylpolysiloxane of the formula (n is 4-25) substantially without low-molecular weight dimethylpolysiloxane of the formula (n is 0-3), and having 3-10cSt viscosity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low-viscosity dimethylpolysiloxane composition that contains high-molecular-weight dimethylpolysiloxane and is substantially free of low-molecular-weight dimethylpolysiloxane, which does not cause skin irritation and is extremely safe for the human body. Furthermore, the present invention relates to a solid cosmetic containing the above-described low-viscosity dimethylpolysiloxane composition and having extremely high safety for the human body.

Conventionally, oily substances collectively known as dimethylpolysiloxane are
Known as a type of silicone oil, fiber treatment agent,
It is used in a wide range of fields as electrical insulating oil, mold release agent, antifoaming agent, etc.

Dimethylpolysiloxane is a compound or a composition thereof having a dimethylsiloxane structure, and there are products with a wide range of viscosities from 0.65 to 100,000 cs depending on the difference in composition distribution, and products with these various viscosities are commercially available.

Dimethylpolysiloxane is used for various purposes in the field of cosmetics, and in particular, dimethylpolysiloxane with a low viscosity of 3 to 10 cs is blended into solid oil-based cosmetics for makeup. This oil-based solid cosmetic contains, for example, an oil component containing solid oil of 35 to 70% by weight and a powder component of 30 to 65% by weight.
The main ingredient of this product is oil, which moisturizes the skin when used, prevents dryness of the skin in the fall and winter, and is excellent for skin physiology. It is prized as a cosmetic. When this cosmetic contains the above-mentioned low-viscosity dimethylpolysiloxane, it spreads easily during use, so oil-based solid cosmetics containing such a composition have recently come into widespread use.

By the way, the present inventors conducted a rigorous test on low-viscosity dimethylpolysiloxane to be added to cosmetics from the viewpoint of ensuring human body safety regarding cosmetics, and found that this product had no skin irritation, etc., as will be described later. It turns out that there are some drawbacks. As a result of our research, we found that a specific low molecular weight dimethylpolysiloxane contained in low viscosity dimethylpolysiloxane is the cause of skin irritation. We have found that trimethylpolysiloxane has no drawbacks such as skin irritation and is completely safe for the human body, and that solid cosmetics containing it are equally safe and spread well.

Furthermore, the present inventors have obtained the following knowledge. In other words, oil-based solid cosmetics containing low-viscosity dimethylpolysiloxane are generally prepared by adding powder to heat-dissolved oil, pouring the molten state into a concrete container, cooling and solidifying, and when necessary, applying a low-pressure press. However, the conventional low viscosity dimethyl i? When +170 Kizan was used, a gap was created between the inner tray and the contents over time, causing the contents to fall out of the inner tray or damaging the appearance. However, if a low viscosity dimethylpolysiloxane having a viscosity of 3 to 10 cs excluding the low molecular weight portion is used, the above-mentioned manufacturing troubles can be solved.

It is a low viscosity dimethylpolysiloxane with a viscosity of 3 to 10 eFi excluding the low molecular weight portion, which can be safely used in applications other than cosmetics, and has the same low viscosity as expected from conventional products with a viscosity of 3 to 1 Qcs. It was also found that dimethylpolysiloxane exhibits its original efficacy.

The present invention has been completed based on the above findings, and consists of the following two points.

(1) In the following formula (3), including high molecular weight dimethylpolysiloxane where n is in the range of 4 to 25, and low molecular weight dimethyl polysiloxane where n is in the range of 0 to 3, the viscosity is 3 to 1 Qcs (centistokes). (2) A cosmetic composition containing an oil component containing a solid oil component and a powder component as main components, with n in the following formula. contains a high molecular weight dimethylpolysiloxane in which n is in the range of 4 to 25, substantially does not contain low molecular weight dimethylpolysiloxane in which n is in the range from 0 to 3, and has a viscosity of 3 to 10 cs (centinutokes). A solid cosmetic containing a low-viscosity dimethylpolysiloxane composition.

The low-viscosity dimethylpolysiloxane of the present invention is extremely useful because it has no skin irritation and is highly safe for the human body, and can exhibit its original performance when used in various applications.

(The solid cosmetic of the present invention is highly safe for the human body, spreads well, and has good system safety, but there is still no risk of the contents falling out of the inner tray or damage to the product appearance during manufacturing.) It is extremely valuable because it does not cause any trouble such as being damaged.

The configuration of the present invention will be described below.

The low viscosity trimethylpolysiloxane composition of the present invention contains high molecular weight dimethylpolysiloxane in which n is in the range of 4 to 25 in the following formula, and substantially free of low molecular weight dimethylpolysiloxane in which n is in the range of 0 to 3. It is something.

For convenience, in formula (1), C(CH, ()3-s is also used)
Letting CH3M be CH3M and [ni5iO-] be D, low molecular weight CI (
The trimethylpolysiloxanes are M2, M2D, and M2D, respectively, when n is 0 to 3.

It can be displayed as M2D22M2D3, and the following description may be based on such a display.

The composition of the present invention can be prepared, for example, from a commercially available low viscosity dimethylpolysiloxane with a viscosity of 3 to 10 cs to a low molecular weight M2. M
2D, , M2D2. It can be obtained by removing M2D3 by fractional distillation, taking advantage of the difference in volatility (the lower the molecular weight, the higher the volatility). For example 29-56
By removing what is distilled off at 71 mm Hg (oil bath temperature 120-138°C), a product containing only the desired high molecular weight dimethylpolysiloxane and having the desired viscosity can be obtained.

If the viscosity of the composition is less than 3 cs, M2D3
Below (M2, M2DI, M2D2, M
2D3) I always have a lot of business to do.

It can be confirmed from the following experimental results that the composition of the present invention has high human safety.

For each of the compositions of the present invention, M2 to M2D3, which were removed by fractional distillation, the skin irritation values were investigated by a method according to the FDA method (US Food and Drug Attributes) described below, and the results are shown in the following table.

(Note) S: Skin - secondary irritation value Sample: Fractional distillation of silicone KF-96L (manufactured by Shin-Etsu Chemical Co., Ltd.) Numerical evaluation 20 to less than 2 Almost no irritation 2 to 5 Moderate irritation The results show that the composition of the present invention has a skin irritation value of 0, indicating that it has no skin irritation.

Eye irritation experiments using rabbits and acute toxicity experiments using mice were still conducted, and the composition of the present invention had no safety problems in these respects.

A method according to FDA law will be explained.

[Test method] Japanese gray yuzu rabbits weighing 2.3 Kg to 3 KF are used. Eight rabbits whose backs were shaved with electric clippers were divided into two groups of four rabbits each, and one group was left alone (
In the other group, an abrasion is made at the test site (AbradedSkin) and fixed in a fixator.

The test substance is applied to the skin using an animal testing plaster with a lint cloth at 0.3 mA and 2.5 cm in diameter.

After 24 hours, the bandage is removed, and the degree of erythema and edema is recorded according to the skin reaction criteria. Judgment will be made again after 72 hours.

〔judgement〕

(1) Formation of erythema and epidermis. No erythema is observed at all.
...0 Slight erythema is observed...
・・・・・・・・・1 Those with obvious erythema・
・・・・・・・・・・・・・・・2 Strong erythema is observed・・・・・・・・・・・・・・・・・・・・・3 Strong erythema and slight epilepsy are observed 4 (2i. Formation of edema. No edema is observed.)
・・・・・・・・・0 Very slight edema observed...1 Slight edema observed...
・・・・・・・・・・・・2 Moderate edema is observed ・・・・・・・・・・・・・・・3 (approximately 1wn degree) Severe edema is observed...・・・・・・・・・
・・・・・・・・・4 (more than 1 light and protruding outside the area of application) Average evaluation of erythema (skin skin) and edema formation after 24° and 72 hours for 4 birds each with intact skin and damaged skin The average value obtained by adding the above values and dividing this by the number of animal specimens (4) represents the evaluation of animal skin irritation.

Next, in the second aspect of the present invention, the low viscosity trimethylpolysiloxane composition of the first aspect of the present invention is blended into a cosmetic composition whose main components are an oil component containing solid oil and a powder component. It is a solid cosmetic.

Here, solid cosmetics are defined as oil components containing solid oils.
~70% by weight, and the powder component is 30~65% by weight.

In the present invention, the low viscosity trimethylpolysiloxane composition having a specific composition with a viscosity of 3 to 10 cs is usually used in cosmetics with a viscosity of 1 to 65 cs.
The solid cosmetic of the present invention containing 9% by weight has no skin irritation, has extremely high skin safety, spreads well, and is easy to use.

The solid oil contained in the oil component in the present invention has a melting point of 40°C.
Among the above, higher alcohols, higher fatty acids, hydrocarbons, various esters including natural waxes, and various glycerides including natural oils and fats, one or more of them have a melting point of 40°C or higher, arbitrarily selected and used. Examples of these solid oils include cetyl alcohol, nutaryl alcohol, stearic acid,
Examples include behenic acid, hard paraffin, microcrystalline wax, polyethylene powder, candelilla wax, bean wax, carnauba wax, parico wax, and hydrogenated castor oil. The amount of solid oil blended is 1.0 to 60.0% by weight of the solid cosmetic.
It is. If it is less than 1.0% by weight, the hardness characteristic of solid oils will be lost and the surface of the solid cosmetic will become too soft; if it weighs less than 600% by weight, the surface will become too hard.
Both are undesirable because the cosmetics will not be properly applied to the cosmetic tools (sponges and puffs).

In addition to the solid oil component described above, the oil component in the present invention includes:
Vegetable oils, animal oils, mineral oils, synthetic ester oils, etc. commonly used in cosmetics can be used. Examples of these include, for example, olive oil, jojoba oil, castor oil, lanolin and its derivatives, squalane, liquid paraffin, petrolatum, l-rimechololpropane tristearate, isopropyl myristate, glycerol triester.
-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoyl 1.

In addition, synthetic silicone oils such as polyphenylmethylsiloxane can also be used within a range that is compatible with the purpose of the present invention.

The blending amount of the oil component including the solid oil component is 35 to 70% by weight of the solid cosmetic. At 35% by weight or less, even when heated, the fluidity is poor and it is difficult to pour into a medium dish. If the weight exceeds 70%, the finished solid cosmetic will become oily, slippery when applied to the skin, and the makeup will not last long.

The powder components used in the present invention are powders generally used in cosmetics, such as extender pigments such as talc, mica, clay, and kaolin, inorganic pigments such as titanium oxide, zinc white, iron oxide, and ultramarine, organic pigments, and Pearl pigments, etc. The blending amount is determined by the amount of oil (including solid oil) on a weight scale of 30 to 65.

In addition to the above-mentioned essential ingredients, the solid cosmetic according to the present invention may contain pigments, preservatives, fragrances, and the like, if necessary.

The present invention will be explained below with reference to examples. Example 1 162 ml of hexamethyldisiloxane (M2) was placed in a 1 ton three-necked flask equipped with a cooling tube and a stirring device. (1 mol), octamethylcyclotetrasiloxane 682.29 (2
, 3 moles) and 4.9 r (0.05 moles) of concentrated sulfuric acid were charged, and the mixture was reacted by heating at 50° C. for about 3 hours in a nitrogen atmosphere.

After the reaction is complete, add water from step 52 and stir for an additional 30 minutes. This is washed with a 5% Na2CO3 aqueous solution and then washed with water until the washing solution becomes neutral.

Next, low-boiling components (M2D4
(below) was distilled off, leaving a distillation residue of 795? I got it. As a result of gas chromatography analysis, this product is M2D5~M2D
Contains 95% or more of 13 and has a viscosity of 58cs (25℃)
Met.

Example 2 A foundation was manufactured using the following formulation.

■ Dimethylpolysiloxane 27 parts xane composition obtained in seconds ■ Activator 5 ■ Carnauba wax 2 ■ Solid paraffin
10 ■ Mica
20 ■ Kaolin 151
5' ■Titanium oxide 4→■Coloring pigment
5 ■Fragrance
A total of 100 parts of (1) and (2) are mixed, and (1) to (2) are added thereto and mixed.

Then, add ① and ②, heat, and mix. After that, it is degassed, flavoring is added, and it is filled into a medium tray, and after cooling, it is heated under low pressure (5Kq).
/ctl) to get the foundation.

Example 3 Eye shadow was manufactured according to the following formulation.

■Dime'chirupo'7 obtained in Example 1 38.5 parts Siloxane■Suffuran 15■Activator
o5 ■ Carnauba Rou
5■ Solid paraffin
51r;″ ■Mica colored pigment 10■・Guru pigment
10 ■Fragrance
A total of 100 parts of ■■■ are mixed, and ■■■ is added thereto and mixed.

Then add ■■, heat and mix. Thereafter, it was degassed, a fragrance was added, and the mixture was filled into an inner tray to obtain an eye shadow.

Example 4 Habonoku was produced according to the following recipe.

■ Trimethyl poly 35 parts siloxane composition obtained in Example 1 ■ Inpropyl myristate 5 ■ Activator
3■ Carnauba wax
5■ Solid/Rough-in
1 ■ Mica 3
5■Coloring pigment 5■・Gulp agent 10■Fragrance
A total of 100 parts of ■■■ are mixed, and ■■■ is added thereto and mixed.

Then add ■■ and heat and mix. After that, it is degassed, flavoring is added, and the mixture is poured into the inner plate.It does not cause skin irritation and is safe for the human body. There will be no gaps, the contents will not come out, and the product appearance will not be damaged.

Patent applicant: Shiseido Co., Ltd.

Claims (3)

[Claims] (1) In the following formula (3), including a high molecular weight dimethylpolysiloxane in which n is in the range of 4 to 25, a low molecular weight dimethylpolysiloxane in which n is in the range from o to 3 is substantially non-toxic, and the viscosity is 3.
A low viscosity polymethylpolysiloxane composition having a centineutox of ˜10 cs. (2) A cosmetic composition containing an oil component containing a solid oil component and a powder component as main components contains a high molecular weight dimethylpolysiloxane in which n is in the range of 4 to 25 in the formula. Low molecular weight dimethylpolysiloxane in the range of 3 is substantially non-toxic and has a viscosity of 3
A solid cosmetic containing a low viscosity dimethylpolysiloxane composition having a viscosity of ~10 cs (centine tox). (3) The main components are oil component 35-70% by weight and powder component 3
Claim (2) A solid cosmetic having a weight ratio of 0 to 65.