JP7295807B2 - Water-in-oil emulsified cosmetic - Google Patents

Description

TECHNICAL FIELD The present invention relates to a water-in-oil emulsified cosmetic having a sherbet-like appearance. More specifically, the present invention relates to a water-in-oil type emulsified cosmetic having a novel and unique feel in use, which has a sherbet-like appearance but transforms into powder with a dry feel when applied to the skin.

"Sherbet" generally means an ice confection made by stirring and freezing fruit juice or sugar water. Sherbet consists of ice cubes and can be crushed with a spoon or the like and put into the mouth to enjoy a cold and refreshing taste. Therefore, a cosmetic having an appearance reminiscent of sherbet (sherbet-like appearance) gives the user a visually refreshing feeling by arousing the sensation of actually touching sherbet or eating sherbet. be able to.

When the aerosol composition described in Patent Document 1 is injected from an aerosol container, it freezes due to the latent heat of vaporization associated with the volatilization of the propellant and becomes sherbet-like. That is, since this composition actually freezes and becomes sherbet-like, it gives a refreshing feeling not only visually but also tactilely.

Patent Document 2 describes that a composition containing sodium polyacrylate and a water-soluble thickening agent such as cellulose gum can be used to produce a cosmetic dosage form similar to sherbet. However, Patent Document 2 does not refer to visual effects based on the sherbet-like appearance, and only evaluates the soft physical properties and peeling effect of the composition. Moreover, what is actually prepared in Patent Document 2 is an oil-in-water emulsified cosmetic (packing agent) containing a large amount of water, and a water-in-oil emulsified cosmetic is not described.

Patent Document 3 describes a solid water-in-oil emulsified cosmetic that has a sherbet-like feeling when used. However, the cosmetic does not have a sherbet-like appearance, and only gives a crisp, sherbet-like feel when used. In addition, since the cosmetic of Patent Document 3 contains a cooling agent such as menthol, it can provide a refreshing feeling, but since it contains solid oil as an essential component, it feels heavy when applied to the skin, and it is a dry powder. It is presumed that the feeling cannot be obtained.

JP-A-11-5715 Japanese translation of PCT publication No. 2013-544280 JP-A-2000-351712

The present invention is a novel oil that is a water-in-oil emulsion that not only exhibits a sherbet-like appearance that gives a visually refreshing feeling, but also gives a smooth powdery feeling when applied to the skin. An object of the present invention is to provide a neutral water type emulsified cosmetic.

As a result of intensive studies in order to solve the above problems, the present inventors have found that a water-in-oil type emulsified cosmetic blended by combining an oil-absorbing silicone elastomer and an oil-absorbing silicone powder can contain the silicone elastomer and/or the silicone. The present inventors have found that a novel cosmetic having a sherbet-like appearance and a smooth powder-like feel during use can be obtained by allowing the powder to absorb liquid oil, thereby completing the present invention.

That is, the present invention
(a) 0.5 to 10% by weight of an oil-absorbing silicone elastomer;
(b) 3 to 15% by weight of oil-absorbing silicone powder;
Provided is a water-in-oil emulsified cosmetic that contains (c) liquid oil and (d) water and exhibits a sherbet-like appearance.

The water-in-oil type emulsified cosmetic of the present invention is a water-in-oil type emulsified cosmetic that can contain oil having an emollient effect, yet exhibits a sherbet-like appearance that gives a visually refreshing feeling, and is applied to the skin. When applied, it has a new and unique feeling of use that gives a smooth powdery feeling.

The water-in-oil emulsified cosmetic of the present invention (hereinafter also simply referred to as "the cosmetic of the present invention") comprises (a) an oil-absorbing silicone elastomer, (b) an oil-absorbing silicone powder, and (c) the component (a). and/or (b) liquid oil absorbed, and (d) water.

(a) Oil Absorbing Silicone Elastomer The "oil absorbing silicone elastomer (component a)" in the cosmetic of the present invention is a crosslinked amorphous silicone elastomer. More specifically, it is a silicone elastomer having a three-dimensional structure in which the silicone main chain is crosslinked with an alkylene chain, a polyoxyalkylene chain, or the like.

The silicone chain (main chain) of the oil-absorbing silicone elastomer has a polysiloxane skeleton composed of dimethylpolysiloxane, methylphenylpolysiloxane, diphenylpolysiloxane, etc., and may be modified by alkyl modification, polyether modification, or the like. . The bridging moieties are preferably polyoxyalkylene (polyether) chains such as polypropylene glycol (PPG), polyethylene glycol (PEG), polybutylene glycol (PBG).

The oil-absorbing silicone elastomer in the cosmetic of the present invention may be blended in the form of a paste dispersed in oil. The oil to be dispersed is not particularly limited, but examples include cyclic silicone oils such as cyclopentasiloxane, linear or branched silicone oils such as dimethicone, methyltrimethicone, and diphenylsiloxyphenyltrimethicone, mineral oil, and isododecane. and hydrocarbon oils such as squalane.

Commercial products available in paste form containing oil-absorbing silicone elastomers include, for example, EL-7040 (PEG-12 dimethicone/PPG-20 crosspolymer; caprylyl methicone), EL-8050 ID (PEG-12 dimethicone/PPG -20 crosspolymer; isododecane), EL-8051 IN (PEG-12 dimethicone/PPG-20 crosspolymer; isodecyl neopentanoate), EL-8052 IH (PEG-12 dimethicone/PPG-20 crosspolymer; isohexadecane), 9040 (dimethicone crosspolymer; cyclopentasiloxane), 9045 (dimethicone crosspolymer; cyclopentasiloxane), 9240 (dimethicone crosspolymer; dimethicone (2cs)), and 9041 (dimethicone crosspolymer; dimethicone (5cs)) [above, Toray manufactured by Dow Corning], KSG-042Z (lauryl polydimethylsiloxyethyl dimethicone/bisvinyl dimethicone crosspolymer; isododecane), KSG-045Z (lauryl polydimethylsiloxyethyl dimethicone/bisvinyl dimethicone crosspolymer; cyclopentasiloxane), KSG- 320Z (PEG-15/lauryl polydimethylsiloxyethyl dimethicone crosspolymer; isododecane), KSG-350Z (PEG-15/lauryl polydimethylsiloxyethyl dimethicone crosspolymer; cyclopentasiloxane), KSG-15 (dimethicone/vinyl dimethicone crosspolymer cyclopentasiloxane), KSG-16 (dimethicone/vinyl dimethicone crosspolymer; dimethicone), KSG-18A (dimethicone/phenyl vinyl dimethicone crosspolymer; diphenylsiloxyphenyl trimethicone), KSG-210 (dimethicone/PEG-10/15 crosspolymer; dimethicone), KSG-310 (PEG-15/lauryl dimethicone crosspolymer; mineral oil), KSG-710 (dimethicone/polyglycerin-3 crosspolymer; dimethicone), and KSG-830 (lauryl dimethicone/polyglycerin- 3) Crosspolymer; Trioctanoin) [manufactured by Shin-Etsu Chemical Co., Ltd.] and the like, but not limited thereto. The above parenthesis means (elastomer name; medium).

The actual content of (a) the oil-absorbing silicone elastomer in the cosmetic of the present invention is 0.5 to 10% by mass, preferably 0.6 to 8% by mass, more preferably 0.6 to 8% by mass, based on the total amount of the cosmetic. is 0.7 to 6% by mass. If the blending amount is less than 1% by mass, the feeling of dryness may not be obtained.

(b) Oil-absorbing silicone powder The "oil-absorbing silicone powder (component b)" in the cosmetic of the present invention is a powder composed of a silicone elastomer having a three-dimensional structure in which polysiloxane main chains are crosslinked. Component b is a powder having a fixed shape such as a sphere, and is distinguished from the amorphous silicone elastomer (component a).
As the oil-absorbing silicone powder of the present invention, a silicone elastomer powder in which both the main chain and the crosslinked portion are composed of silicone chains is preferably used. In addition, it is also possible to use a form in which silicone powder is dispersed in a medium. Examples of commercially available oil-absorbing silicone powders include TORAYFIL series manufactured by Dow Corning Toray Co., Ltd. (TORAYFIL E-505C, TORAYFIL E-506C, TORAYFIL E-506S, TORAYFIL E-505W, etc.).

The shape of the oil-absorbing silicone powder of the present invention is not particularly limited, but spherical, truly spherical, or elliptical powders are preferably used. Although the average particle size of the oil-absorbing silicone powder is not particularly limited, it is preferably 0.1 to 100 μm, preferably 1 to 50 μm. Further, the oil-absorbing silicone powder is preferably a spherical powder having elasticity with a JIS A hardness (rubber hardness) of 20 to 100, preferably 30 to 80, for example.

The content of (b) the oil-absorbing silicone powder in the cosmetic of the present invention is 3 to 15% by mass, preferably 4 to 12% by mass, more preferably 5 to 10% by mass, based on the total amount of the cosmetic. . If the amount is less than 3% by mass, sherbet-like appearance may not be obtained, and if the amount is more than 15% by mass, dry feeling may not be obtained.

The “oil absorption” of the oil-absorbing silicone elastomer (component a) and the oil-absorbing silicone powder (component b) incorporated in the cosmetic composition of the present invention is, for example, oil absorption measured according to JIS K-5101 (oil absorption). It can be defined by quantity.

For example, using silicone oil (low to medium viscosity dimethicone; for example, "SH200C-5CS", manufactured by Dow Corning Toray Co., Ltd.), according to JIS K-5101, 1 g of a sample (silicone elastomer or silicone powder) was precisely placed on a glass. Weigh the sample on a plate, add silicone oil little by little to the center of the sample, and knead the sample uniformly with a spatula each time. The end point is immediately before the whole becomes a paste and becomes fluid, and the amount of silicone oil added up to that point is taken as the oil absorption. The unit of oil absorption is calculated by the following formula as oil absorption per 100 g of sample.

In the present invention, a sample having an oil absorption of 200 g/100 g or more calculated according to the above formula from measurements using dimethicone with a viscosity of 5 cSt is defined as "oil absorption".

In the cosmetic of the present invention, the ratio of (a) silicone elastomer to (b) silicone powder ((a):(b)) is in the range of 10:1 to 1:10. is preferred, more preferably 2:1 to 1:8, still more preferably 1:1 to 1:7.

(c) Liquid oil The liquid oil (component c) blended in the cosmetic of the present invention is an oil that is liquid at normal temperature (25°C), and is used in cosmetics. Hydrocarbon oil, ester oil, silicone oil, liquid oil. etc. can be selected.
The liquid oil in the present invention includes at least one liquid oil that can be absorbed by either or both of component a (oil-absorbing silicone elastomer) or component b (oil-absorbing silicone powder). "Absorbable liquid oil" means that the "oil absorption" (value defined by the above formula) of component a or component b with respect to the liquid oil is 100 g/100 g or more, preferably 200 g/100 g or more. means oil.
Specific examples of the liquid oil component preferably used in the present invention are as follows.

Hydrocarbon oils include liquid paraffin, squalane, squalene, paraffin, isoparaffin, ceresin, isohexadecane, isododecane, and the like.

Ester oils include pentaerythrityl tetraethylhexanoate, cetyl ethylhexanoate, jojoba oil, di(phytosteryl/octyldodecyl) lauroyl glutamate, triisostearin, glyceryl diisostearate, triethylhexanoin, dimer dilinoleic acid (phytosteryl/behenyl). , dimer dilinoleate (phytosteryl/isostearyl/cetyl/stearyl/behenyl), isopropyl palmitate, macadamia nut fatty acid phytosteryl, tetra (behenate/benzoate/ethylhexanoate) pentaerythrityl, ethylhexyl palmitate, myristyl myristate , isopropyl myristate, tripropylene glycol dipivalate, diisopropyl sebacate, isodecyl neopentanoate, and the like.

Examples of silicone oils include linear silicones such as dimethylpolysiloxane, methylphenylpolysiloxane and methylhydrogenpolysiloxane, and cyclic silicones such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane and dodecamethylcyclohexasiloxane. be done.

Liquid oils include linseed oil, camellia oil, macadamia nut oil, corn oil, mink oil, olive oil, avocado oil, sasanqua oil, castor oil, safflower oil, rapeseed oil, soybean oil, peanut oil, triglycerin, and trioctanoic acid. glycerin, glycerin triisopalmitate, and the like.

The liquid oil component in the present invention also includes an ultraviolet absorber that is liquid at room temperature. Examples of UV absorbers include octylmethoxinnamate, octocrylene, polysilicone-15, bisresorcinyltriazine, ethylhexyltriazone, diethylaminohydroxybenzoylhexylbenzoate, oxybenzone-3 and the like.

The cosmetic of the present invention may contain a combination of a plurality of liquid oils, and preferably contains at least one volatile liquid oil. The volatile liquid oil can be selected from volatile hydrocarbon oils such as isododecane, and volatile silicone oils such as low-viscosity (5 sc or less) linear silicone oils and cyclic silicone oils. Among them, it is particularly preferable to blend a volatile silicone oil.

The amount of the liquid oil (component c) blended in the cosmetic of the present invention is not particularly limited, but is preferably 5 to 50% by mass, more preferably 10 to 40% by mass, based on the total amount of the cosmetic.
Moreover, it is preferable that the ratio of the volatile liquid oil to the total amount of the liquid oil is 50% by mass or more.

(d) Water Water (component d) in the cosmetic of the present invention is a component that constitutes the internal phase of the water-in-oil emulsified cosmetic.
The content of water (component d) in the cosmetic of the present invention is not particularly limited, but is 40% by mass or less, preferably 35% by mass or less, more preferably 30% by mass or less, relative to the total amount of the cosmetic. The lower limit of the blending amount is, for example, 5% by mass or more, preferably 8% by mass or more, and more preferably 10% by mass or more.

The cosmetic of the present invention is a water-in-oil emulsified cosmetic that exhibits a sherbet-like appearance by combining the essential components (a) to (d). The cosmetic of the present invention preferably has a hardness of 3 to 40 (hardness measured at 25° C. using a rheometer (11.3φ, 3 mm needle penetration)). Furthermore, the point where the ratio (G″/G′=tan δ) of the storage elastic modulus (G′) to the loss elastic modulus (G″) is 1 has viscoelasticity in the range of strain 1 to 10%. preferably prepared. By providing the hardness and viscoelasticity as described above, not only the appearance but also the texture resembles sherbet.

The cosmetic of the present invention can visually provide a refreshing feeling due to its sherbet-like appearance. Furthermore, if (e) a cooling sensation component is added to the cosmetic composition of the present invention, it is possible to experience a refreshing sensation accompanied by a dry powdery sensation during use.
The (e) cooling sensation component (refreshing agent) used in the present invention is not particularly limited as long as it is a cooling sensation component that can be usually blended in cosmetics. , vanyl butyl ether (VBE), camphor, mint, and the like.

The cosmetic of the present invention can contain other optional ingredients that are usually blended in cosmetics, etc., as long as they do not impair the effects of the present invention. Other optional ingredients include, but are not limited to, moisturizing agents (including glycols such as 1,3-butylene glycol and propylene glycol), lower alcohols (ethanol, propanol, etc.), thickeners, powders ((b) oil absorbing silicone powder), natural or synthetic polymers, sugars or sugar alcohols, antioxidants, buffers, various extracts, stabilizers, preservatives, pigments, fragrances, and the like.

The cosmetic of the present invention can be produced according to a conventional method for water-in-oil emulsified cosmetics. However, (a) an oil-absorbing silicone elastomer, (b) an oil-absorbing silicone powder, and (c) a liquid oil (that is absorbed by component a or component b) are mixed in advance to form a mixture, and water-in-oil prepared separately. It is preferably prepared by adding the above mixture to a type emulsion (cream base) and optionally stirring.

EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited thereto. In addition, unless otherwise specified, the compounding amount represents % by mass with respect to the total amount.

A water-in-oil emulsified cosmetic (cream base) was prepared with the composition shown in Table 1 below.

Raw materials shown in Table 2 below were mixed and stirred to form a mixture. The values of the compounding amounts shown in Tables 1 and 2 are % by mass of the total amount of the cosmetic, which is the combination of the cream base in Table 1 and the mixture in Table 2.

The cosmetics (Examples 1 to 19) obtained by adding the mixtures shown in Table 2 to the cream bases shown in Table 1 all had a sherbet-like appearance, and when applied, had a smooth powdery feel. Gave. In addition, the blended cooling agent gave a cool touch to the applied skin.
Tables 3 and 4 describe the hardness (11.3φ) value of each cosmetic. All the examples had a hardness in the range of 3 to 40, and the tactile sensation was reminiscent of sherbet.

Next, the following cosmetics were prepared by changing the amount of the cream base and the amount of the silicone elastomer shown in Table 1 (Table 5).

Each of the cosmetics of Examples A, B and C had a sherbet-like appearance and gave a smooth powdery feel when applied. On the other hand, Comparative Example D, in which no oil-absorbing silicone elastomer was blended, had an appearance similar to sherbet, but crumbled and did not give a smooth powdery feel. Comparative Example E, which contained no oil-absorbing silicone powder, did not have a sherbet-like appearance.

Claims (3)

(a) an oil-absorbing silicone elastomer having a structure in which 0.5 to 10% by mass of silicone chains are crosslinked with polyether ;
(b) 3 to 15% by weight of oil-absorbing silicone powder;
(c) liquid oil, and (d) 30% by mass or less of water,
Does not contain spherical polyurethane resin powder,
The (c) liquid oil contains a volatile liquid oil containing a volatile silicone oil and a volatile hydrocarbon oil, and the ratio of the volatile liquid oil to the total amount of the (c) liquid oil is 50% by mass or more. can be,
A water-in-oil emulsified cosmetic characterized by exhibiting a sherbet-like appearance. 2. The cosmetic composition according to claim 1 , wherein the ratio ((a):(b)) of (a) the amount of silicone elastomer to the amount of (b) silicone powder is in the range of 10:1 to 1:10. . 3. The cosmetic according to claim 1, further comprising (e) a cooling component.