JPH03284610A - Emulsion cosmetic - Google Patents

Abstract

PURPOSE:To obtain an emulsion cosmetic having good feel in use of excellent spread free from greasiness, improved water resistance and stability with time, containing specific oil-absorbing polymer powder. CONSTITUTION:An emulsion cosmetic prepared by a conventional procedure is blended with 1-30wt.%, especially 2-16wt.% oil-absorbing polymer powder capable of absorbing >=1.5 as much squalane as empty weight, such as an acrylate copolymer having a structural unit shown by formula I and formula II (R is 1-30C straight-chain or branched chain alkyl) or a porous vinyl-based polymer obtained by polymerizing one or more of vinyl-based monomers having 7-10 solubility parameter and making porous. A preferable emulsion cosmetic comprises 5-40wt.% (especially 10-37wt.%) oil agent, 5-75wt.% (especially 10-65wt.%) water, 0-7wt.% (especially 0-5wt.%) emulsifying agent and the above- mentioned ratio of the oil absorbing polymer powder.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to emulsified cosmetics, and more specifically, emulsified cosmetics that are uniform, spread well, have no stickiness, and are easy to use, as well as have good stability over time. Regarding fees.

[Conventional technology]

Traditionally, water-in-oil (Wlo), oil-in-water (0/W)
Cosmetics are prepared by emulsifying oils such as hydrocarbon oils and silicones, which give a light and smooth feel.
Particularly in recent years, silicones have become widely used because they are comfortable to use and highly safe for the skin.

However, the emulsions obtained by emulsifying such oils with common emulsifiers have poor stability, and conventionally, gelling agents have been added to achieve this stabilization.

[Problem to be solved by the invention]

However, even by adding conventional gelling agents, the emulsion system cannot be sufficiently stabilized, and it has been particularly difficult to obtain stable emulsions of silicone.

Therefore, conventional methods for obtaining stable emulsions of silicone include: (1) solidifying silicone with wax; (2) solidifying silicone with wax;
A method using a clay mineral treated with an organopolysiloxane derivative, or a method in which silica or lipophilized silica is added have been proposed. However, methods (■) and (2) have the drawbacks of being difficult to spread and are sticky, as well as having poor stability over time at high temperatures;
There is a drawback that it is necessary to shake the emulsion with a ladle to obtain a uniform emulsified system during use.

[Means to solve the problem]

Under such circumstances, the inventor of the present invention conducted intensive research to solve the entrustment problem, and found that unstable Wlo and O/W
By adding and blending a specific highly oil-absorbing polymer powder into an emulsifying system, it is possible to obtain an emulsified cosmetic that is stable for a long time and has a good feeling of use. The present invention was completed based on the discovery that a stable emulsification system can be obtained even in a system in which there is no such system.

That is, the present invention provides an emulsified cosmetic containing an oil-absorbing polymer powder that can absorb squalane at least 1.5 times its own weight.

The emulsified cosmetics of the present invention include all types of cosmetics that can be applied to the skin in the form of emulsions, such as creams, foundations, milky lotions, eyeshadow lip glosses, mascaras, eyeliners, cover-ups, and moisturizers. Examples include risers, acne concealers, depilatory agents, epidermis removers, and the like.

The oil absorption of the oil-absorbing polymer powder in the present invention was measured using squalane according to the method for measuring pigment oil absorption specified in JIS 5101 (1978). Take the Ig powder, add squalane little by little, and then knead it using a spatula.The end point is when the powder becomes paste-like.Required weight of squalane per 100g of powder (g) It was shown as follows.

The oil-absorbing polymer powder of the present invention must be capable of absorbing squalane in an amount equal to or more than 1.5 times its own weight when measured by the method described above.

Such oil-absorbing polymer powders are, for example, represented by the following general formulas (I) and (I') (wherein R represents a linear or branched alkyl group having 1 to 30 carbon atoms). Acrylate copolymer with structural units; 1 of vinyl monomers with solubility parameter of 7 to 10
Examples include porous vinyl polymers obtained by polymerizing one or more species and making them porous (Japanese Patent Application Laid-open No. 316715/1983). Among these, a representative example of agglate copolymers is POLYTRAP manufactured by Dow Conning.
There is.

In addition, the oil absorption amount (magnification relative to its own weight) of the main pigments conventionally used is 0.6 for talc and 0.4 for silicone-coated talc.
8, sericite 0.61, silicone coated sericite 0
．． 5, silicone-coated titanium oxide: 0.26, silicone-coated iron oxide: 0.42, zinc oxide: 0.87, nylon powder: 0.47, and does not have the emulsion stabilizing effect of the present invention.

The emulsified cosmetic composition of the present invention is produced by adding and mixing oil-absorbing polymer powder to an emulsion prepared by a conventional method. A preferable emulsified cosmetic composition of the present invention is an oil agent of 5 to 40% by weight (hereinafter expressed as %) (particularly preferably 10 to 37%).
, 5-75% water (particularly preferably 10-65%), emulsifier 0-7% (particularly preferably 0-5%) and oil-absorbing polymer powder 1-30% (particularly preferably 2-16%). It contains.

As the oil agent, any oil that is generally used in cosmetics can be used, but among these, hydrocarbon oils and fats and silicones are preferred.

Examples of hydrocarbon oils and fats include liquid or semi-solid oils such as mineral oil, vegetable oil, animal oil, higher fatty acids and higher fatty acid esters; solid oils such as hydrocarbons, waxes, hydrogenated oils, higher fatty acids and higher alcohols. , and silicones include low-viscosity silicones such as dimethylpolysiloxane and methylphenylpolysiloxane with a viscosity of 5 to 1 oocs; octamethylcyclotetra represented by the general formula (n) (wherein n represents an integer of 3 to 8); Examples include cyclic silicones such as siloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, tetradecamethylcyclohexasiloxane, and cyclooctasiloxane.

As emulsifiers, silicone surfactants such as polyether-modified silicones (e.g. dimethylpolysiloxane polyoxyalkylene copolymer); polyoxyethylene addition type, polyglycerin ester type, polyglycerin ether type, alkyl glycoside type, sugar Examples include nonionic surfactants such as ester types.

In addition to the above-mentioned ingredients, the emulsified cosmetic of the present invention may include ultraviolet absorbers, antioxidants, preservatives, anti-inflammatory agents, vitamins, hormones, etc. within a quantitative and qualitative range that does not impair the effects of the present invention, depending on the purpose. Other ingredients that are usually included in cosmetics, such as drugs and fragrances, can also be included.

〔Effect of the invention〕

The emulsified cosmetic composition of the present invention spreads easily and has a good feeling of use without stickiness, and has excellent water resistance and stability over time. In particular, according to the present invention, it is possible to emulsify silicone in Wlo to obtain an emulsified cosmetic that is stable for a long period of time.

〔Example〕

Next, an example will be given and explained. In the Examples and Comparative Examples, stability over time and performance in use were evaluated as follows.

(1) Stability over time A sample was taken in a 50 d screw tube, left to stand under various temperature conditions, and evaluated in a separated state.

Evaluation criteria ○: Transparent liquid is hardly recognized. △: Transparent liquid is slightly visible ×: Quite a lot of transparent liquid is observed (2) Performance in use The room temperature product was applied to the back of the hand and evaluated.

Evaluation criteria ○: Uniform application X: Ununiform application Examples 1 to 4 Foundation (W10 type emulsified cosmetic) Take ■ to ■ and O in a beaker, and use a dispenser to 1500
After stirring at ~2000 rpm until the whole was homogeneous, powders @~■ were mixed and ground in advance and stirred again using a disper as before to obtain the desired emulsified cosmetic. All preparations were performed at room temperature.

The stability over time, usage performance, and viscosity of this emulsified cosmetic were investigated. The results are shown in Table 1.

Below are blank examples 5-B Foundation (W10 type emulsified cosmetic) The aqueous phase (■, ■) was completely dissolved in a water bath and then cooled to 60°C, and the oil phase was stirred with a homomixer. (■, ■, ■, ■, @) were added gradually, and the rotation speed was increased until a sufficient emulsification state was achieved. Thereafter, it was immersed in ice water, and further treated with a homomixer for 5 minutes while adding volatile silicone (■, ■). Next, a powder portion prepared by mixing and pulverizing ① to ① was added using a disper while stirring and dispersing the mixture well to obtain a uniform emulsified cosmetic. The stability over time of this product is shown in Table 2.

Below is a margin Example 7 After completely dissolving the foundation (○/W type emulsified cosmetic phase (■~■, ■, ■), add the powder that has been mixed and crushed with ■ and ■ in advance and use a disper to make it uniform. Stir thoroughly until the completely dissolved aqueous phase (■,■
) was mixed with the oil phase to which powder was added, and the mixture was thoroughly stirred with a disper to obtain the desired emulsified cosmetic. The stability over time of this product is shown in Table 3.

Below is the margin Example 8 Cream (W10 type emulsified cosmetic) aqueous phase part (■
, ■) and the oil phase (■~■, ■~■, 0) are heated to 70°C, and the aqueous phase is added to the oil phase while stirring to emulsify.
This was cooled to room temperature while stirring to obtain a cream. The stability over time of this product is shown in Table 4.

Margin below

Claims (1)

[Claims] 1. An emulsified cosmetic containing oil-absorbing polymer powder capable of absorbing squalane in an amount of 1.5 times or more its own weight. 2. The emulsified cosmetic according to claim 1, wherein the content of the oil-absorbing polymer powder is 1 to 30% by weight. 3. Oil agent 5-40% by weight, water 5-70% by weight, emulsifier 0
~7% by weight and oil-absorbing polymer powder 1 according to claim 1 ~
Emulsified cosmetic containing 30% by weight.