JPS61218509A - Cosmetic - Google Patents

Abstract

PURPOSE:A cosmetic, containing a silicon oil, polyoxyalkylene-modified organopolysiloxane, organic-modified clay mineral, water and a hydrophobized pigment and having good stability and dispersibility and improved feeling of use. CONSTITUTION:A cosmetic containing (A) 20-90wt% silicon oil, (B) 0.2-25wt% polyoxyalkylene-modified organopolysiloxane expressed by formula I or II (R is methyl or phenyl; R' is H or alkyl; p is 1-5; q is 2 or 3), (C) 0.2-10wt% organic-modified clay mineral, (D) 0.1-60wt% hydrophobized pigment and water. The component (D) is obtained by treating a pigment, e.g. titanium oxide, kaolin, mica or ultramarine, with a nonionic surfactant, having <=7 HLB, metal soap or fat or oil, etc., and the incorporation thereof improves further the pigment dispersibility and provides stability without causing separation, etc., even under severe conditions.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to cosmetics with excellent stability and usability.

[Conventional technology]

Traditionally, silicone oil has been used in a variety of products. Particularly in cosmetics, silicone oil is smooth to use and has excellent water repellency, and when volatile silicone oil is added, it spreads easily at the beginning, and the silicone oil evaporates as it is applied. Since it is possible to produce makeup cosmetics that do not smudge, it can be incorporated into facial cosmetics that require a long-wearing feel, hand creams and hair cosmetics that require water-repellent performance, and makeup cosmetics. It has been expected. Silicone oil also has the requirements for being a cosmetic raw material, as it is highly safe for the skin.

[Problem that the invention seeks to solve]

However, silicone oil has the disadvantage that it is very difficult to obtain a stable thickening system, and despite strong demand, silicone oil has to be blended in large amounts and has an appropriate viscosity. No composition was obtained.

Up to now, in order to obtain a highly stable silicone oil thickening system, methods have been used, such as solidifying silicone oil with waxes, or thickening it with silica or silica treated to make it lipophilic. However, the method of solidifying with waxes has disadvantages in usability such as being difficult to spread and is sticky, and lacks fluidity, which limits its applicability. Further, the method of thickening with silica is not preferred because it has poor stability over time and requires shaking well before use.

In view of these circumstances, the inventors of the present invention have conducted intensive research on methods of thickening silicone oil, and have developed a method for increasing the viscosity of silicone oil by blending specific amounts of a specific silicone compound, organically modified clay mineral, and water into silicone oil. Based on this knowledge, they filed a patent application for a ``gel composition containing silicone oil'' (Japanese Patent Application No. 59-235).
492).

Furthermore, as a result of continued research by the present inventors, when a hydrophobized pigment is blended into the above-mentioned "gel composition containing silicone oil", pigment dispersibility is further improved and product stability is improved. For example, it was found that separation does not occur even under harsh conditions such as on a sandy beach in midsummer. The present invention is based on this knowledge.

That is, the present invention provides silicone oil, general formula (I),
This cosmetic is characterized by containing one or more polyoxyalkylene-modified organopolysiloxanes represented by (II) or (I[[), an organically modified clay mineral, water, and a hydrophobized pigment.

(Left below) (In the general formula (N, (II), (I
12 alkyl groups, p is a number from 1 to 5, q is a number from 2 to 3,
x, m, and n are average numbers, and the polyoxyalkylene-modified organopolysiloxane contains 2 to 40% by weight of polyoxyalkylene groups in the molecule, and the viscosity of the polyoxyalkylene-modified organopolysiloxane is 5 to 3 at 25°C.
000 centistokes. ) Hereinafter, the structure of the present invention will be explained in detail.

As the silicone oil used in the present invention, conventionally known silicone oils can be used.

For example, dimethylpolysiloxane, methylphenylpolysiloxane, octamethylcyclotetrasiloxane,
Examples include decamethylcyclopentasiloxane.

One or more types are arbitrarily selected from these.

The blending amount is usually 20 to 90% by weight of the total amount of the cosmetic of the present invention.
It is.

The polyoxyalkylene-modified organopolysiloxane (hereinafter abbreviated as polyether-modified silicone) used in the present invention has the general formula (I), (II) or (III).
), and any one or more of these may be selected and used.

In order to satisfy the effect consistent with the purpose of the present invention, that is, the silicone thickening effect with good stability over time and ease of use, the polyether-modified silicone should contain 2 to 40% by weight of polyoxyalkylene groups based on its molecular weight. and has a viscosity of 5 to 3000 at 25°C.
It must be within the centistoke range. That is, if the ratio of polyoxyalkylene groups to the total weight of polyether-modified silicone is less than 2% by weight, the thickening effect will not be sufficient, and if it exceeds 40% by weight, stability over time will deteriorate.

Further, if the viscosity of the polyether-modified silicone is less than 5 centistokes, the thickening effect will not be sufficient, and if it exceeds 3000 centistokes, the feeling of use will be sticky, which is undesirable.

The amount of polyether-modified silicone added to the cosmetic composition of the present invention is selected within the range of 0.1 to 30% by weight based on the total amount, preferably 0.2 to 25% by weight.

If it is less than 0.1 fffffi%, the thickening effect will not be sufficient and the stability over time will be poor. If it exceeds 30% by weight, it will feel sticky and the makeup will not last long.

The organically modified clay minerals used in the present invention are clay minerals in which water and exchangeable cations interposed between crystal layers are replaced with organic polar compounds or organic cations, such as dioctadecyldimethylammonium salt-modified montmorillonite, octadecyldimethylbenzyl Examples include ammonium salt-modified montmorillonite and dioctadecyldimethylammonium salt-modified montmorillonite. One or more types are arbitrarily selected from these.

The blending amount is selected within the range of 0.1 to 15% by weight, and preferably 0.2 to 10% by weight based on the total amount of the cosmetic composition of the present invention. If it is less than 0.1% by weight, the thickening effect will not be sufficient and the stability over time will be poor. If it exceeds 15% by weight, it becomes difficult to spread and the usability deteriorates.

The amount of water in the present invention is 0.2 to 8 in the total amount of cosmetics.
It is selected in the range of 0% by weight, preferably 0.5 to 6% by weight.
It is 0% by weight. If it is less than 0.2% by weight, the thickening effect will not be sufficient and the stability over time will be poor. If it exceeds 80% by weight, it becomes difficult to spread, which is not preferable.

The hydrophobized pigment used in the present invention can be a pigment that has been hydrophobized by a conventionally known method. For example, H
Items treated with a surfactant of LB7 or less (nonionic surfactants are especially good), items treated with metal soaps such as calcium stearate or zinc myristate, items treated with oil or resin, and items treated with silicone oil. Examples include those treated with higher fatty acids such as stearic acid and palmitic acid, and those treated with methylhydrodiene polysiloxane.

One or more of these may be arbitrarily selected and used.

The blending amount is usually 0.1 to 60% of the total amount of the cosmetic of the present invention.
Weight%.

In addition to the above-mentioned essential ingredients, the cosmetic of the present invention may contain wax, oil, humectant, pigment, resin, fragrance, preservative, etc., as necessary.

The cosmetic composition of the present invention can be similarly obtained by using organically modified clay minerals that have been previously treated with polyether-modified silicone.

〔Effect of the invention〕

The cosmetics of the present invention have good stability and pigment dispersibility even under harsh usage and storage conditions, spread well when used, have a good feel without stickiness, and have good water resistance and long-term durability. It is also an excellent cosmetic.

In addition, since the viscosity or fluidity can be freely controlled, it can be used in a wide range of applications.

〔Example〕

Next, the present invention will be explained in more detail with reference to Examples. The present invention is not limited thereby. The blending amount is in weight%.

The test methods for various properties of Examples and Comparative Examples were as follows.

(1) Take the sample into a stability sample tube and set it at 50℃, (5-45℃)/(1
The sample was left for 2 cycles per day) and evaluated based on the degree of separation.

Evaluation criteria O: No separation △; Separation of about 115 X: 2/3 or more separation (2) Viscosity Measured with a Brookfield type viscosity needle (30°C).

(3) Stickiness and spreadability Sensory evaluation by practical use test (20 panelists).

Evaluation criteria O: No stickiness, easy spread.

△: Slightly sticky, spreads normally.

×: Sticky, hard to spread.

(4) Dispersibility Evaluated with optics 8 & mirror.

Evaluation criteria O: No aggregates, good dispersibility.

Δ: Some aggregates were present.

x: i ritual object present, poor dispersion.

(Material below [Manufacturing method] ① to ② were stirred in a homodisper to obtain a water-resistant eyeliner.

The hydrophobized iron oxide black was obtained by dissolving 3 g of sorbitan tristearate in 100 mg of hexane, adding 17 g of iron oxide black therein, stirring with a homodisper for 30 minutes, and then removing hexane with an evaporator and drying. .

From the properties shown in the table, it can be seen that Examples 1.2.3.4 are excellent in stability over time and usability under severe temperature conditions.

(The following is a blank space) [Return i] Phases 1 to 1 were stirred in a homodisper to obtain a sunscreen cream.

In addition, the hydrophobized titanium dioxide is isoparaffin 10
25 g of titanium dioxide was added to a solution of 1.5 g of 2-heptylundecyl palmitate in 1.0 g of 2-heptyl undecyl palmitate, and the mixture was stirred at 120° C. for 5 hours in a N2 gas stream, and then the isoparaffin was removed using an evaporator and dried.

From the properties shown in the table, it can be seen that Examples 5.6.7 are excellent in stability over time and usability under severe temperature conditions.

(Left below) *Pigment composition Titanium dioxide 40% Talc 25 Mica 25 Yellow iron oxide 2.7 Red iron oxide 6.5 Black iron oxide 0.8 [Manufacturing method] ■ - 0 are stirred in a homodisper to create a water-resistant foundation. I got it.

The hydrophobized pigment was prepared by melting 2 g of methylhydrodiene polysiloxane in 100 g of hexane, adding 98 g of foundation pigment therein, stirring with a homodisper for 10 minutes, removing the hexane with an evaporator, and then This was placed in a constant temperature bath at 180°C and heat-treated for 3 hours.

From the characteristics shown in the table, it can be seen that Example 8 is excellent in stability over time and usability.

Claims (1)

[Claims] (1) Blending silicone oil, one or more polyoxyalkylene-modified organopolysiloxanes represented by general formula (I), (II), or (III), organically modified clay mineral, water, and a hydrophobized pigment. Cosmetics characterized by: ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I) ▲There are mathematical formulas, chemical formulas, tables, etc.▼(II) ▲There are mathematical formulas, chemical formulas, tables, etc.▼(III) {General formulas (I), (II), In (III), R is a methyl group or partially a phenyl group, and R' is hydrogen or has 1 to 1 carbon atoms.
2 alkyl group, p is a number from 1 to 5, q is a number from 2 to 3, x
, m, and n are the average numbers, and the polyoxyalkylene-modified organopolysiloxane has 2 polyoxyalkylene groups in its molecule.
-40% by weight, and the viscosity of the polyoxyalkylene-modified organopolysiloxane is 5 to 30% at 25°C.
Represents a numerical value that equals 00 centistokes. }