JP2001181136A - Pigment for cosmetic, and cosmetic containing the pigment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide sufficient water repellency and adhesion to the skin to provide moist feeling. SOLUTION: This pigment for a cosmetic is obtained by coating the surface of a pigment to be subjected to a coating treatment, with 0.5-30 wt.% n- octyltrimethoxysilane or n-octyltriethoxysilane based on the amount of the pigment by a silane coupling reaction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cosmetic pigment used for makeup cosmetics such as foundation, eyeshadow, blusher and the like, and to a cosmetic comprising the cosmetic pigment.

[0002]

2. Description of the Related Art Conventionally, in order to impart water repellency to makeup cosmetics such as foundations, eyeshadow, and blusher, metal soaps and silicon compounds have been surface-treated on cosmetic pigments incorporated in these cosmetics. Things are used.

[0003]

However, when a cosmetic pigment surface-treated with metal soap is blended with a cosmetic, there is a problem that the water repellency is improved but the feel becomes heavy. On the other hand, when a cosmetic pigment that has been surface-treated with a silicone compound is blended into the cosmetic, the water repellency is dramatically improved, but the feel is too smooth, the moist feeling is poor, and the adhesion to the skin is poor. Is not so good.

[0004] The present invention has been made to solve such problems, and when formulated into a cosmetic, while having high water repellency, the feel is not moist and heavy.
An object of the present invention is to provide a cosmetic pigment having high adhesion to the skin, and to provide a cosmetic comprising the cosmetic pigment.

[0005]

Means for Solving the Problems and Functions / Effects In order to achieve the above-mentioned object, a pigment for cosmetics according to the present invention has a pigment surface having a general formula (1):

Embedded image Characterized by being coated with a compound represented by the following formula by a silane coupling reaction.

According to the present invention, by treating the surface with the compound represented by the general formula (1), sufficient water repellency and adhesion to the skin can be obtained, and a moist feel can be obtained. Can be. Here, the alkyl chain portion of the compound of the general formula (1) must be linear, and if it is not linear, sufficient adhesion to skin and moist feeling cannot be obtained. On the other hand, the number of carbon atoms in the alkyl chain portion must be 8, and if it is less than this, sufficient water repellency cannot be obtained, and if it exceeds this, the desired feeling of moistness cannot be obtained. . The reason why n in the general formula (1) is set to 1 or 2 is that it is very easy to cause a silane coupling reaction, and that the compound in which n is 1 or 2 is inexpensive. This is because there is an advantage of being easy.

In the present invention, the weight ratio of the compound represented by the general formula (1) to the pigment to be coated is 0.5.
It is preferably about 30% by weight. Further, the content is more preferably 1 to 10% by weight. The weight ratio of the compound represented by the general formula (1) is 0.5 to 0.5 with respect to the pigment to be coated.
If the amount is less than 30% by weight, sufficient water repellency cannot be obtained, and the desired moist feeling and good adhesion to the skin cannot be obtained. If the amount exceeds 30% by weight, the feeling becomes moist. It is not preferable because it becomes oily and damp feeling. Therefore, the weight ratio of the compound represented by the general formula (1) is 1 to 10% by weight based on the pigment to be coated.
In this case, the effect is achieved that the desired performance can be achieved with any cosmetic pigment.

Next, a cosmetic according to the present invention is characterized by containing the above-mentioned pigment for cosmetics.
The above-mentioned cosmetic pigment is used as a cosmetic, for example, a foundation,
By using it in makeup cosmetics such as eyeshadow and blush, it has high water repellency, but it is easy to prepare into a cosmetic that is moist, not heavy and has good adhesion to the skin. it can.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the pigment for cosmetics according to the present invention, the general formula (1):

Embedded image Are n-octyltrimethoxysilane or n-octyltriethoxysilane, and these compounds are used directly in the surface coating treatment reaction. As a method of performing surface coating treatment by a silane coupling reaction using these compounds, a pigment to be coated is added while being stirred under a suitable mixer in the air while dropping or spraying the compound. Stir at high speed for a certain time.
Thereafter, a method of performing a reaction surface coating treatment by heating and aging at 80 to 200 ° C. while continuing stirring is generally used.

Alternatively, the compound represented by the general formula (1) is dissolved in an inert organic solvent such as n-hexane, methylene chloride or the like, and a pigment for cosmetics is added to this solution while stirring. Thereafter, a method of completely evaporating and removing the organic solvent, followed by heating and aging at 80 to 200 ° C. to carry out a reaction surface coating treatment may be used.

In this case, the weight ratio of the compound represented by the general formula (1), that is, n-octyltrimethoxysilane or n-octyltriethoxysilane, used for the surface coating treatment of the pigment is determined with respect to the pigment to be coated. 0.
5 to 30% by weight. If the weight ratio is less than 0.5% by weight, the water repellency is not sufficient, and the performance intended in the present invention is not sufficient. If the ratio exceeds 30% by weight, the feel becomes very oily and wet. Not suitable as cosmetics. The weight ratio of the compound is more preferably 1 to 10% by weight.

In the present invention, as the pigment to be coated, an inorganic pigment, an organic pigment and a resin powder pigment are used. Here, inorganic pigments include titanium oxide, red iron oxide, yellow iron oxide, black iron oxide, ultramarine, zinc white, magnesium oxide, mica, sericite, talc, silica, kaolin, calcium carbonate, chromium hydroxide, magnesium silicate, Examples include aluminum oxide, barium sulfate, and titanium-coated mica. Examples of the organic pigment include lithol rubin B, lake C, lithol red, rhodamine B, herringdon pink CN, permanent red, benzidine orange G, and phthalocyanine blue. Examples of the resin powder pigment include nylon powder, acrylic powder, and silicon powder.

In the present invention, when a cosmetic pigment which has been surface-coated with n-octyltrimethoxysilane or n-octyltriethoxysilane is incorporated into a cosmetic, it has sufficient water repellency and feels good. It is moist and has excellent adhesion to the skin.

[0014]

EXAMPLES Next, specific production examples, examples and comparative examples of cosmetic pigments and cosmetics according to the present invention will be described.

(Production Example 1) While titanium oxide was being stirred at a high speed with a Henschel mixer, n-octyltriethoxysilane was dropped in such a manner that its weight ratio to titanium oxide was 3% by weight. At this time, the temperature in the Henschel mixer was set to 50 ° C. in order to eliminate variations in the reaction rate. After completion of the dropwise addition, the mixture was stirred at the same temperature for 30 minutes. Thereafter, the temperature in the mixer was set to 110 ° C. and the reaction was aged for 3 hours. It was taken out of the Henschel mixer and pulverized with a hammer type pulverizer to obtain the desired surface-coated titanium oxide (pigment for cosmetics).

Next, in the same manner as described above, instead of the titanium oxide, a pigment to be coated is coated with a cosmetic pigment by using red iron oxide, yellow iron oxide, black iron oxide, talc, sericite, and mica. Prepare. The amount of n-octyltriethoxysilane is 3% by weight based on the pigment to be coated in the same manner as in the case of titanium oxide when using red iron oxide, black iron oxide, or talc or sericite. When mica was used, the content was 5% by weight based on the pigment to be coated.

(Production Example 2) n-octyltrimethoxysilane was weighed so as to become a titanium oxide to be coated,
Dissolved in n-hexane so that the concentration becomes 30% by weight,
This solution was charged into a Henschel mixer. While stirring this solution, titanium oxide was added and stirred for 30 minutes. Thereafter, the temperature in the Henschel mixer was reduced to 50 ° C. and the pressure was reduced, and stirring was continued until n-hexane was completely evaporated and removed. Thereafter, the temperature in the Henschel mixer was set to 120 ° C., and the reaction was aged for 3 hours. Then, it was pulverized with a hammer type pulverizer to obtain a target surface-coated titanium oxide (pigment for cosmetics).

Next, in the same manner as described above, instead of the titanium oxide, the pigment to be coated is replaced with a pigment for cosmetics using red iron oxide, yellow iron oxide, black iron oxide, talc, sericite, and mica. Prepare. The amount (weight ratio) of the n-octyltrimethoxysilane is 5% by weight based on the pigment to be coated similarly to the titanium oxide when using red iron oxide, black iron oxide, or black iron oxide. When talc, sericite or mica was used, the content was 7% by weight based on the pigment to be coated.

In Production Examples 1 and 2, the amount (weight ratio) of n-octyltriethoxysilane or n-octyltrimethoxysilane in talc, sericite, and mica was used.
The reason is that these pigments have few active sites and the surface coverage must be increased to obtain the same water repellency as titanium oxide and various iron oxides.

(Comparative Example 1) In the same manner as in Comparative Example 1,
0.2% by weight based on titanium oxide, red iron oxide, yellow iron oxide, black iron oxide, talc, sericite and mica
Reaction coating treatment was performed using n-octyltriethoxysilane.

(Production Comparative Example 2) In the same manner as in Production Example 1, titanium oxide, red iron oxide, yellow iron oxide, black iron oxide, talc,
A reaction coating treatment was performed using n-octyltriethoxysilane at a weight ratio of 40% by weight to sericite and mica.

Each of the pigments obtained in Production Examples 1 and 2 and Comparative Examples 1 and 2 was
The contact angle of water on a powder plate prepared by pressing with a force of 0 kg / cm ² was measured, and the results are summarized in Table 1. The larger the value of the contact angle, the higher the water repellency.

[Table 1]

As apparent from Table 1, Production Examples 1 and 2
Each of the cosmetic pigments obtained by the above method has a contact angle of 10
The angle greatly exceeds 0 °, indicating that good water repellency can be obtained. In Production Comparative Example 1, the surface coating amount (weight ratio) of n-octyltriethoxysilane was 0.5.
Since the content is less than 100% by weight, the contact angle is much lower than 100 °, and good water repellency is not obtained. Furthermore, in Production Example 2, since the surface coating treatment amount (weight ratio) with n-octyltriethoxysilane exceeds 30% by weight, the obtained cosmetic pigment is oily and moist. it is obvious.

(Examples 1 and 2) Powder foundations were prepared using the cosmetic pigments prepared in Production Examples 1 and 2 with the following composition. Surface Coated Talc 10.0 Surface Coated Titanium Oxide 10.0 Surface Coated Sericite 65.4 Surface Coated Bengala 0.3 Surface Coated Yellow Iron Oxide 1.5 Surface Coated Black Iron Oxide 0.4 Untreated Titanium black 0.4 Methyl phenyl polysiloxane 2.0 Methyl polysiloxane (6 cs) 4.0 Methyl polysiloxane (20 cs) 3.0 Methyl polysiloxane (10,000 cs) 3.0 Total 100.0

Examples 3 and 4 An oily foundation was prepared using the cosmetic pigments prepared in Production Examples 1 and 2. Surface Coated Talc 10.00 Surface Coated Sericite 21.35 Surface Coated Titanium Oxide 20.00 Surface Coated Bengala 0.70 Surface Coated Yellow Iron Oxide 2.50 Untreated Titanium Black 0.45 Carnauba Wax 2 5.00 paraffin wax 3.00 canderia wax 2.50 ethyl glycol distearate 2.00 sucrose fatty acid ester 2.00 methylphenylpolysiloxane 8.50 methylpolysiloxane (6cs) 10.00 methylpolysiloxane (10cs) 8 0.000 Methyl polysiloxane (10,000 cs) 7.00 Total 100.00

Examples 5 and 6 Using the cosmetic pigments prepared in Production Examples 1 and 2, W / O (w
An in-oil foundation was prepared. Surface Coated Talc 3.0 Surface Coated Sericite 2.0 Surface Coated Titanium Oxide 15.0 Surface Coated Bengala 0.2 Surface Coated Yellow Iron Oxide 2.5 Untreated Titanium Black 0.8 Methylpolysiloxane ( 6cs) 7.4 Dimethylcyclohexane-methyl (polyoxyethylene) dimethylsiloxane copolymer 1.8 Methylpolysiloxane (100cs) 8.0 Methylpolysiloxane (10,000cs) 4.0 Methylphenylpolysiloxane 10.0 Ethanol 10.0 1,3-butylene glycol 2.0 Purified water 33.3 Total 100.0

(Comparative Examples 1 and 2) A powder foundation was prepared in the same manner as in Examples 1 and 2 using a commercially available methyl hydroxypolysiloxane 2% by weight surface-treated pigment and a magnesium stearate 5% by weight surface-treated pigment. Prepared.

Comparative Examples 3 and 4 An oil-based foundation was prepared using the same surface-treated pigments as used in Comparative Examples 1 and 2 in the same formulation as in Examples 3 and 4.

(Comparative Examples 5 and 6) W / O foundations were prepared using the same surface-treated pigments as used in Comparative Examples 1 and 2 in the same formulation as in Examples 5 and 6.

Comparative Examples 7 and 8 Powder foundations were prepared using the cosmetic pigments prepared in Comparative Examples 1 and 2 in the same formulation as in Examples 1 and 2.

Comparative Examples 9 and 10 Using the pigments for cosmetics prepared in Comparative Examples 1 and 2, oil-based foundations were prepared in the same formulation as in Examples 3 and 4.

Comparative Examples 11 and 12 W / O foundations were prepared using the cosmetic pigments prepared in Comparative Examples 1 and 2 in the same formulation as in Examples 5 and 6.

Thus, Examples 1 to 6 and Comparative Examples 1 to
The feel when the cosmetic obtained in No. 12 was actually applied to the skin is summarized in Table 2 by panelists' evaluation. The numbers in the table are represented by integers from 1 to 5, with 1 being the worst evaluation, 3 being the normal evaluation, and 5 being the best evaluation. Also,
The feelings evaluated were four types: water repellency, moist feeling, adhesion to the skin, and good spreadability.

[Table 2]

As is apparent from Table 2, the above Production Examples 1 and 2
The cosmetics (Examples 1 to 6) prepared using the cosmetic pigments prepared in the above were prepared by using commercially available methylhydroxypolysiloxane 2% by weight surface-treated pigment and magnesium stearate 5% by weight surface-treated pigment. The prepared cosmetics (Comparative Examples 1 to 6) and the cosmetics prepared using the cosmetic pigments prepared in Production Comparative Examples 1 and 2 (Comparative Examples 7-1)
Water repellency, moist feeling, adhesion to skin,
It turns out that it is remarkably excellent in all of the goodness of growth.

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Claims (3)

[Claims] 1. The surface of a pigment has a general formula (1): A pigment for cosmetics, which is coated with a compound represented by the following formula by a silane coupling reaction. 2. The weight ratio of the compound represented by the general formula (1) to the pigment to be coated is 0.5 to 30% by weight.
The pigment for cosmetics according to claim 1, which is: 3. A cosmetic comprising the cosmetic pigment according to claim 1 or 2.