JPH03120207A - Cosmetic - Google Patents

Abstract

PURPOSE:To obtain a cosmetic not losing flexibility in application to the skin, preventing twisting and stiffness, not having a feeling of coating film, comprising a water-soluble polymer compound and fatty acid ester containing a long-chain branch. CONSTITUTION:A cosmetic useful as a pack agent or hair setting spray of film forming type comprising (A) 5-30wt.%, preferably 7-20wt.% water-soluble polymer compound and (B) 5-30wt.%, preferably 7-20wt.% fatty acid ester containing a long-chain branch. The component B is selected from an ester of a long-chain branch-containing fatty acid (e.g. isostearic acid), an ester of a long-chain branch containing aliphatic alcohol (e.g. 2-hexyldecanol, 2- octyldodecanol or isotearyl alcohol) and an ester of a polyhydric aliphatic alcohol (e.g. glycerin). A water-soluble polymer compound having high ultraviolet light absorbing function and containing COOH is preferable as the component A and one comprising a repeating unit shown by the formula may be cited as the component A.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cosmetic containing a water-soluble polymer compound.

[Conventional technology] Conventionally, water-based cosmetics such as backing agents and film-forming hair setting sprays contain water-soluble polymer compounds that are highly water-soluble and difficult to absorb through the skin, forming a film as water evaporates after application. It is formulated to form.

However, water-based cosmetics containing the above-mentioned water-soluble polymer compounds give the feeling of forming a film after being applied to the skin, and easily rub off when rubbed, or leave a feeling similar to when a pack is applied. It had the disadvantage of giving a stiff feel.

[Problems to be Solved by the Invention] Therefore, the present inventors applied aqueous solutions of various water-soluble polymer compounds to the skin and dried them to determine the hardness, strength, brittleness, and skin characteristics of the films formed. We investigated the adhesion to

As a result, in order to prevent the appearance of a film after applying cosmetics containing water-soluble polymer compounds, it is necessary to: ■ Immediately after application, during the process of evaporation of water, the formed film easily crumbles and falls off when rubbed (see below). , called "Yore")
, ■It was found that there was a need to resolve the issue where the skin becomes hard and tight over time after application (hereinafter referred to as stiffness).

The present inventors conducted further intensive research based on the above findings and found that even in cosmetics containing water-soluble polymer compounds, if an appropriate amount of fatty acid ester with long chain branching is contained. unexpectedly discovered that twisting and stiffness can be prevented, leading to the completion of the present invention.

[Means for Solving the Problems] That is, the present invention provides a water-soluble polymer compound that contains 5 to 309 g of water-soluble polymer compound.
(wt%, the same applies hereinafter) and 5 to 30% of a fatty acid ester having long chain branches.

[Function and Examples] The cosmetic of the present invention contains a fatty acid ester having long chain branches as an oil phase constituent.

By blending such a fatty acid ester with a water-soluble polymer compound in a specific proportion in a cosmetic, it is possible to prevent the cosmetic from twisting and stiffening after being applied, and to create a cosmetic that does not give the impression of a film.

The reason why twisting and stiffness are prevented cannot be confirmed at the molecular level at present, but the present inventors believe that it is as follows.

That is, in cosmetics, side chains of fatty acid esters having a branched structure are entangled in a network structure formed by linear and long main chains of water-soluble polymer compounds, forming a tangled structure. This tangled structure prevents the water-soluble polymer compound (a type of fiber) from being excessively shrunk during the film formation process due to water evaporation, creating an appropriate amount of space within the cosmetic. Since such cosmetics have such spaces, they exhibit flexibility, and are thought to have enhanced oil-retaining and moisturizing effects, thereby preventing wrinkles and stiffness.

The long-chain branched fatty acid ester has at least one branch point in its molecule, and has carbon-carbon bonds and carbon-oxygen bonds in three directions in a T-shape from the branch point.

The long chain branch of the fatty acid ester refers to one in which the chain with the largest number of atoms (the main chain in the branch) arranged linearly from the branch point has 5 or more atoms, preferably 5 to 18 atoms. say. When the number of atoms is less than 5, the effect of preventing twisting and stiffness tends to decrease.

In addition, the said branch may contain not only a hydrocarbon group but various different atoms, such as an oxygen atom and a nitrogen atom.

There are no particular limitations on the fatty acid having long chain branches, but specific examples thereof include isostearic acid (2-hebutylundecanoic acid or 2-isoheptyl isoundecanoic acid).

Specific examples of the long-chain branched aliphatic alcohol include isostearyl alcohol, 2-octyldecanol, 2-hexyldecanol, and 2-octyldodecanol.

Further, specific examples of the polyhydric aliphatic alcohol include glycerin, sorbitol, xylit, and the like.

The aliphatic alcohol that forms an ester with the long-chain branched fatty acid may of course be the aforementioned long-chain branched aliphatic alcohol, but may include, for example, oleyl alcohol, cetyl alcohol, Aliphatic alcohols without long chain branches such as isopropyl alcohol, butyl alcohol, 2-ethylhexyl alcohol, and myristyl alcohol may also be used.

Furthermore, it goes without saying that the fatty acid that forms an ester with the long-chain branched aliphatic alcohol may be the long-chain branched fatty acid, such as stearic acid, palmitic acid, etc. , myristic acid, oleic acid, lauric acid, lysyllic acid, and other long chain unbranched fatty acids.

Specific examples of fatty acids that form esters with the polyhydric aliphatic alcohol include caprylic acid, capric acid,
Examples include 2-ethylhexanoic acid and oleic acid.

In order for the polyhydric aliphatic alcohol ester to become a fatty acid ester having long chain branches, it is necessary to esterify it with at least three fatty acids.

As mentioned above, the fatty acid esters having long chain branches used in the present invention include esters of fatty acids having long chain branches, esters of aliphatic alcohols having long chain branches, and esters of polyhydric aliphatic alcohols. A compound of at least IN selected from the group consisting of:

Specific examples of the fatty acid ester having long chain branches include isopropyl isostearate, sorbitan monoisostearate, 2-octyldodecyl myristate, 2-octyldodecyl oleate, 2-octyldodecyl stearate, Examples include isostearyl myristate, 2-hexyldecacyl myristate, tri(caprylic capric acid) glyceride, tri-2-ethylhexanoic acid glyceride, isostearyl dioctoate, and the like. Among these, myristic acid-2-
Octyldodecyl, 2-octyldodecyl oleate, tri(capryliccapric acid)glyceride and the like are preferred because they do not give a strong oily feel even when used in large amounts.

The long-chain branched fatty acid esters may be used alone or in combination of two or more.

The content of the long-chain branched fatty acid ester in cosmetics cannot be determined unconditionally because it varies depending on the amount of water-soluble polymer compound, the standard application amount for cosmetics, etc. 5 to 30%, preferably 7
It is desirable that it be ~20%. If the content is less than 5%, the effect of preventing wrinkles and stiffness tends to decrease, and if it exceeds 30%, the cosmetic tends to become too oily.

The weight average molecular weight of the water-soluble polymer compound used in the present invention is not particularly limited as long as it has the desired function and water solubility and is difficult to be absorbed through the skin, but it is usually about 1500 to 5oooooo. .

There are no particular limitations on the type of water-soluble polymer compound, and any conventionally used compound can be used. Representative examples of the water-soluble polymer compounds include:
Examples include polystyrene derivatives that have ultraviolet absorbing ability and a carboxyl group in the molecule.

Typical examples of the polystyrene derivatives having ultraviolet absorbing ability and having a carboxyl group in the molecule include the following alkali metal salts and amine salts of polystyrene derivatives discovered by the present inventors. .

As the polystyrene derivative, for example, the general formula (I
): (In the formula, R1 is a hydrogen atom or a lower alkyl group, and X is an oxygen atom or a sulfur atom.) A polymer having a degree of polymerization of 5 to 1000 and consisting of a repeating unit represented by General formula (■): (Formula where R2 is a hydrogen atom or a lower alkyl group, R1 and X are the same as above) and a repeating unit represented by the general formula (110).

(wherein n is 0.1.2 or 3, R2 and X are the same as above)
1000 polymer, General 2M: (In the formula, R3 represents a hydrogen atom or a carboxyl group)
A copolymer consisting of repeating units represented by (
Number of repeating units represented by general formula m)> (general formula l)
The degree of polymerization, which is the number of repeating units expressed by
00 copolymer, the degree of polymerization consisting of repeating units represented by general formula [IV]: 5 to 1000
Furthermore, copolymers containing at least two of the repeating units represented by the above general formulas (1) to M can be mentioned.

Specific examples of the polystyrene derivative include poly(p'-carboxybenzaldehyde 4-methyl-2
-p-vinylbenzylthiosemicarbazone), poly[(
po-carboxybenzaldehyde 4-methyl-2-p
-vinylbenzaldehyde 4-(p'-carboxybenzaldehyde 4-methyl-2-p-vinylbenzylthiosemicarbazone)], poly(p-vinylbenzaldehyde 4-carboxymethyl-2-methylthiosemicarbazone), Poly[(p-vinylbenzaldehyde)2.
4-dimethylthiosemicarbazone)-(maleic acid)]
, poly[(4-carboxy-4'-vinyldibenzoylmethane)-(p''-carboxybenzaldehyde 4-methyl-2-p-vinylbenzyl semicarbazone)].

The preferred weight average molecular weight of these polystyrene derivatives is 3,000 to 200,000.

The alkali metal salt or amine salt of the polystyrene derivative can be produced by, for example, suspending the polystyrene derivative in water and adding an alkali metal hydroxide such as sodium hydroxide or potassium hydroxide or a basic compound such as an amine. sell.

Note that the water-soluble polymer compound is usually used alone or in combination of two or more.
Used in combination of more than one species.

The content of the water-soluble polymer compound in the cosmetic is:
It is desirable that it is 5 to 30%, preferably 7 to 20%. If the content is less than 5%, the function imparted to the cosmetic tends to be too small; if it exceeds 30%, the viscosity of the cosmetic increases and it is difficult to apply it uniformly. It tends to be difficult.

The blending ratio of the water-soluble polymer compound and the fatty acid ester having long chain branches in the cosmetic of the present invention (water-soluble polymer compound/fatty acid ester) is from 5130 to 5130 by weight.
3015, preferably 5125 to 2015, more preferably 7120 to 15/10.

If this blending ratio is smaller than the above range,
The effect of incorporating a water-soluble polymer compound tends to be too small, and if it is larger than the above range, it tends to become impossible to prevent twisting and stiffness.

The water-soluble polymer compound is usually mixed with water. Such water is not particularly limited, but purified water or the like is usually used. The blending amount of the water is 100% of the water-soluble polymer compound.
200 to 1000 parts (parts by weight, same hereinafter),
It is preferable that the content is <300 to 800 parts. If the amount of water is less than 200 parts, it tends to become viscous and difficult to emulsify, and if it exceeds 1,000 parts, the function of the water-soluble polymer compound tends to decrease. be.

In addition to the water-soluble polymer compound and the long-chain branched fatty acid ester, the cosmetic of the present invention contains various ingredients that can be normally blended into emulsion-type cosmetics depending on the type thereof. They can be appropriately selected and blended within a range that does not impair the effectiveness of the cosmetic.

Such optional ingredients include, for example, bases, pigments, emulsifiers, ultraviolet absorbers, antioxidants, preservatives/sterilizers, fragrances, colorants, metal (ion) sequestrants, and pharmacological agents. etc.

Examples of the base include oils and fats such as liquid paraffin, squalane, and olive oil; higher aliphatic alcohols such as cetanol, stearyl alcohol, cetostearyl alcohol, and oleyl alcohol; and polyhydric alcohols such as glycerin, propylene glycol, and 3-butylene glycol. Examples include alcohol.

Examples of the pigment include powder components such as titanium oxide and kaolin.

Examples of the emulsifier include anionic surfactants such as lauryl sulfate, lauryl phosphoric acid, and stearic acid; Ionic surfactant; stearic acid triethanolamine salt, 2-amino-2-methyl-
Examples include 1,3-propanediol.

Examples of the ultraviolet absorber include ethyl para-aminobenzoate, cinoxate, oxybenzone, and urocanic acid.

Examples of the antioxidant include butylhydroxyanisole, dibutylhydroxytoluene, and the like.

Examples of the antiseptic/sterilizing agents include parabens and the like.

Examples of the metal (ion) sequestering agent include ethylenediaminetetraacetic acid tetrasodium salt (EDTA-4Na).

Examples of the drug having pharmacological effects include dN-α-tocopherol acetate, which has pharmacological effects such as promoting blood circulation.

The cosmetic of the present invention is prepared as an emulsion type cosmetic such as lotion, milky lotion, cream, etc. using the above-mentioned ingredients. Note that the emulsion type as used herein refers to a cosmetic in the form of an emulsion, and may be a water-in-oil type or an oil-in-water type.

The cosmetic composition of the present invention can be prepared by a common method. That is, depending on the nature of the emulsifier used, the emulsifier is added to the water phase, oil phase, or both phases, heated and mixed,
It can be prepared.

As an example of the general method, water-soluble components such as water-soluble polymer compounds and emulsifiers and water are used as an aqueous phase, and oil-soluble components such as fats and oils and emulsifiers are used as an oil phase. Examples include a method of preparing an emulsified cosmetic by heating to a temperature of 70 to 75°C, preferably 70 to 75°C, mixing the aqueous phase and the oil phase, and cooling the mixture to room temperature while stirring. Note that during emulsification, although an increase in viscosity, which is characteristic of solutions of polymer compounds, is observed,
As a result, the general emulsion type cosmetics can be replaced.

When using stearic acid triethanolamine salt as an emulsifier, stearic acid is added to the oil phase and triethanolamine is added to the water phase, and both phases are mixed to form the stearic acid triethanolamine salt at the oil-water interface. Cosmetics can be prepared by a method of producing.

The thus obtained cosmetic of the present invention does not cause the formation of a film even when applied to the skin, even though it contains a water-soluble polymer compound. The material can be applied uniformly and in a flexible state to the surface.

Next, the cosmetic composition of the present invention will be explained in more detail based on Examples, but the present invention is not limited to these Examples.

Example 1 and Comparative Example 1 An aqueous phase consisting of the following components (1) to (2) was heated to 75°C. This aqueous phase was mixed with an oil phase consisting of the following components ① and ② at 75°C.
A slightly yellowish white emulsion A is obtained by adding it to the heated liquid and cooling it to room temperature while stirring.
(Example 1).

On the other hand, as a control (Comparative Example 1), a control emulsion B was obtained in the same manner as described above, except that the unbranched fatty acid ester component shown in (■) below was used in place of the fatty acid ester component that had branches (■) below. .

Product name and amount used (grams per 100g of cosmetics) ■Water-soluble polymer compound: Poly(p-carboxybenzaldehyde 4-methyl-2-p-vinylbenzylthiosemicarbazone) 15.0 ■General water-soluble ingredients : Triethanolamine 6.71.3-Butylene glycol 9. IEDTA-4Na
O,05 ■ Powder ingredients: Titanium oxide 2,0 ■ Purified water appropriate amount ■ General oil-soluble ingredients: Squalane 5.0 Cetostearyl alcohol 2.0 Oleyl alcohol
2.0 Acetate-dfI-α-tocopherol 0.
5 Parabens 0.1 Stearic acid 1.5 Fatty acid ester components with the following properties: Sorbitan monoisostearate 1.8 Oleic acid-2
-Octyldodecyl 580 tri(caprylic capric acid) Glyceride 5.0 ■ Fatty acid ester component with no component: sorbitan monostearate
1.8 Isopropyl myristate 5.0 Oleyl oleate 5.0 Next is Panera.
The obtained emulsion A and control emulsion B were examined for twisting and stiffness by five people according to the following method. The results were rounded off to the nearest whole decimal place based on the average value of the five evaluations, and the resulting values are shown in Table 1.

(Wrinkle) Apply emulsion 50B to the backs of the left and right hands (approximately 5 x 5 (J),
After 30 minutes, twisting was evaluated based on the following criteria.

(Judgment criteria) 4: Wrinkling is not observed at all.

3: No wrinkling observed.

2: Slight waviness is observed.

1: Significant waviness is observed and it is unusable.

(Stiffness) The emulsion was applied to the backs of the left and right hands of panelists (approximately 5 x 5 cm), and 5 hours later, stiffness was evaluated based on the following criteria.

(Judgment criteria) 4: No stiffness observed at all.

3: No stiffness observed.

2: Slight stiffness is observed.

1: Significant stiffness was observed, making it difficult to use the fist.

Example 2 As the general water-soluble component, the following component (■) was added to the component (2) used in Example 1, and the following component (2) was used as the branched fatty acid ester component. Cream A was prepared in the same manner as in Example 1.

Next, the resulting cream A was examined for twisting and stiffness in the same manner as in Example 1. The results are shown in Table 1.

Product name and amount used (grams per cosmetic toog) ■General ice-water soluble ingredients: Lioxyethylene lanolin 1.5 ■Fatty acid ester ingredients with fractions: Sorbitan monoisostearate 2.5 tri(capric acid) Glyceride 5 ,0 myristic acid2
-Octyldodecyl 5,0 2-hexyldecyl myristate 5.0 Instearyl dioctoate 5.
0 Example 3 The amount of water-soluble polymer compound in Example 1 was changed to 15.0 g.
From 5. Emulsion C was prepared in the same manner as in Example 1, except that the amount of the following compounds among the components (1), (2) and (2) was decreased as shown below.

Next, twisting and stiffness when using Emulsion C were evaluated in the same manner as in Example 1. The results are shown in Table 1.

Product name and amount used (grams per 100g of cosmetics) ■General ice water-soluble ingredients: -amino-2-methyl-1,3-propanediol
2.2■ - Cereal oil-soluble components: Oleyl alcohol 0.0 Stearic acid 1.0 ■ Fatty acid ester components having the following properties: Sorbitan monoisostearate 1.0 -2-octyldodecyl oleate 2.5 Tri(caprylic caprin) acid) glyceride 2.5 Example 4 The water-soluble polymer compound in Example 1 was converted into poly[(p
-carboxybenzaldehyde 4-methyl-2-p-
A slightly yellowish white emulsion was prepared in the same manner as in Example 1, except that vinylbenzylsemicarbazone)-(p''-carboxybenzaldehyde 4-methyl-2-p-vinylbenzylthiosemicarbazone) was prepared.

Next, in the same manner as in Example 1, twisting and stiffness were evaluated when white emulsion was used. The results are shown in Table 1.

Example 5 Example ffI except that the water-soluble polymer compound in Example 1 was changed to poly(p-vinylbenzaldehyde-4-carboxymethyl-2-methylthiosemicarbazone).
A slightly yellowish white emulsion E was prepared in the same manner as f1.

Next, in the same manner as in Example 1, twisting and stiffness were evaluated when white emulsion E was used. The results are shown in Table 1.

Example 6 The water-soluble polymer compound in Example 1 was converted into poly[(p
-Vinylbenzaldehyde 2,4-dimethylthiosemicarbazone>-(maleic acid)] A slightly yellowish white emulsion F was prepared in the same manner as in Example 1, except that the emulsion was replaced with -vinylbenzaldehyde 2,4-dimethylthiosemicarbazone>-(maleic acid).

Next, in the same manner as in Example 1, twisting and stiffness were evaluated when white emulsion F was used. The results are shown in Table 1.

Example 7 The water-soluble polymer compound in Example 1 was converted into poly[(4
-carboxy-4°-vinyldibenzoylmethane)-(
p-carboxybenzaldehyde 4-methyl-2-p
-vinylbenzylsemicarbazone)]
Slightly yellowish white emulsion G in the same manner as in Example 1
was prepared.

Next, in the same manner as in Example 1, twisting and stiffness were evaluated when white emulsion G was used. The results are shown in Table 1.

[Left below] 1. Since no twisting or stiffness was observed,
It can be seen that the cosmetic composition of the present invention does not cause the formation of a film.

[Effects of the Invention] Although the cosmetic of the present invention contains a water-soluble polymer compound, it also contains a fatty acid ester having a specific long-chain branched structure, so it is easy to apply to the skin. It has the excellent effect of not losing flexibility, preventing twisting and stiffness, and not making you feel the film.

Further, the cosmetic of the present invention allows a water-soluble polymer compound having functions such as ultraviolet absorbing ability to be uniformly and flexibly applied to the skin.

Claims (1)

[Scope of Claims] 1. A cosmetic comprising 5 to 30% by weight of a water-soluble polymer compound and 5 to 30% by weight of a fatty acid ester having long chain branches. 2. The fatty acid ester having long chain branches is selected from the group consisting of esters of fatty acids having long chain branches, esters of aliphatic alcohols having long chain branches, and esters of polyhydric aliphatic alcohols. The cosmetic according to claim 1, which is at least one fatty acid ester. 3. The cosmetic according to claim 2, wherein the long chain branched fatty acid is isostearic acid. 4 the aliphatic alcohol is 2-hexyldecanol,
3. The cosmetic according to claim 2, which is at least one selected from the group consisting of 2-octyldodecanol, 2-octyldodecanol, and isostearyl alcohol. 5. The cosmetic according to claim 2, wherein the polyhydric aliphatic alcohol is at least one selected from the group consisting of glycerin, sorbitol, and xylit. 6. The cosmetic according to claim 1, wherein the water-soluble polymer compound has ultraviolet absorbing ability and has a carboxyl group in the molecule.