JP6039250B2 - Emulsified cosmetics - Google Patents

Description

  The present invention relates to an emulsified cosmetic, and more particularly to a skin care cosmetic that is not sticky and not only has an excellent moisturizing effect, but also has excellent skin familiarity and penetration when applied.

  The amount of water in the skin stratum corneum is closely related to maintaining the health of the skin and protecting it from various external stimuli, and plays a major role in preventing skin aging, maintaining moisture, and maintaining smoothness. Reference 1). The moisture in the stratum corneum is usually controlled by natural moisturizing factor (NMF) and sebum membrane, but its function is easily reduced by aging and external stimuli, so moisturizing cosmetics supplement the moisturizing ingredients. It is important to keep skin moisture normal.

  Many conventional moisturizing cosmetics contain water-soluble polyhydric alcohols such as propylene glycol, 1,3 butylene glycol, and glycerin as moisturizers. However, moisturizing cosmetics formulated with these water-soluble polyhydric alcohols have the drawback of having a moisturizing effect but a heavy and sticky feel (see Patent Document 1, paragraph 0002).

  On the other hand, thickening polysaccharides such as xanthan gum, carrageenan, guar gum, locust bean gum and the like are known as thickeners widely used in cosmetics. However, since these thickening polysaccharides tend to be sticky, when used in a moisturizing cosmetic, the usability may be further reduced.

  In recent years, an agar pulverized gel has been proposed as a thickener excellent in usability such as non-stickiness and long-term stability (no water separation). Patent Document 2 discloses an average particle size obtained by dissolving a hydrophilic compound having gelling ability such as agar in water or an aqueous component, and then cooling it by standing to form a gel, and then pulverizing the gel. It has been proposed to use a microgel of 0.1 to 1000 μm as a thickener. Unlike the thickening polysaccharides or synthetic polymer thickeners conventionally used in cosmetics, the thickener obtained in this way does not exhibit a thickening effect due to the entanglement at the molecular level. It is said that since a thickening effect is exhibited by friction between pulverized microgels, stickiness is hardly generated and a refreshing feeling of use can be realized.

  So far, various cosmetics using this agar pulverized gel have been developed (for example, Patent Documents 3 and 4), and application to moisturizing cosmetics has also been proposed (Patent Document 5). Patent Document 5 discloses a moisturizing effect (moist feeling) by combining a plate-like powder, a moisturizing agent, an oil component having an IOB of 0.1 to 0.5, and an agar pulverized gel in a skin care emulsified cosmetic having a moisturizing effect. It has been proposed to maintain a long period of time, reduce stickiness, and improve glossiness. In particular, in order to obtain a non-sticky cosmetic, it is necessary to blend a plate-like powder, and furthermore, the bulkiness that can be caused by the plate-like powder is offset by the moisturizing effect of the oil whose IOB is 0.1 to 0.5. It is considered.

  However, when the powder component is blended with emulsified cosmetics containing agar crushed gel, it is very good in non-stickiness, but it may become unfamiliar when applied to the skin, or it may cause a feeling of bulkiness and squeaky There is.

  Thus, there is still a demand for an emulsified cosmetic that has an excellent moisturizing effect and is not sticky, and has a good penetration into the skin and does not give a squeaky feeling.

JP 2006-131520 A JP 2001-342451 A JP 2009-203200 A JP 2001-342125 A JP 2010-168302 A

“Cosmetic Ingredients for Cosmetics 2008”, written by Kazunari Suzuki, 2008, published by Chuo Shoin, p. 71

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an emulsified cosmetic excellent in skin familiarity and moisturizing effect.

  As a result of intensive research, the inventors have found that stickiness can be suppressed by blending a predetermined amount of an ester derivative of neopentanoic acid and a linear low molecular weight silicone oil into an emulsified cosmetic containing an agar-pulverized gel. In addition, the present inventors have found that a moist feeling and good skin familiarity can be improved at the same time, and the present invention has been completed. It should be noted that by using a combination of an ester derivative of neopentanoic acid and a linear low-molecular-weight silicone oil, excellent skin familiarity that cannot be obtained with other ester oils or cyclic siloxane oils, i.e., penetration into the skin. Can be realized.

That is, the present invention
(A) 0.01-5% by mass in terms of agar solid gel in terms of agar solid content,
(B) 0.1-7% by mass of an ester derivative of neopentanoic acid, and (c) 0.1-15% by mass of a linear low molecular weight silicone oil.
The gist of the emulsified cosmetic composition is included.

  According to the emulsified cosmetic according to the present invention, the formulation of the agar pulverized gel hardly causes stickiness when the cosmetic is applied to the skin, and has a refreshing feeling of use, and at the same time, an ester derivative of neopentanoic acid and linear The blending of low molecular weight silicone oil can improve skin affinity and moist feel at the same time. In addition, since the powder component is not required to prevent stickiness, a squeaky sensation peculiar to the powder does not occur.

  The emulsified cosmetic of the present invention is characterized by containing a predetermined amount of (a) agar pulverized gel, (b) an ester derivative of neopentanoic acid, and (c) a linear low molecular weight silicone oil. Hereinafter, the present invention will be described in detail.

<(A) Agar ground gel>
The agar pulverized gel is obtained by pulverizing a gel formed by dissolving agar in water or an aqueous solvent and then allowing it to cool and solidify. The agar pulverized gel produced in this way does not feel sticky or squeezed even when blended with various preparations, and is stable over a long period of time without causing a decrease in viscosity even when highly blended with other pharmaceutical ingredients and salts. It is known as a thickener (see, for example, Patent Document 2).

  As the agar used for the agar pulverized gel, any natural product or commercially available product can be applied without limitation as long as it contains agarose having a high gelling power as a main component. Examples of commercially available agar include Ina Agar PS-84, Z-10, AX-30, AX-100, AX-200, T-1, S-5, and M-7 (manufactured by Ina Food Industry Co., Ltd.). Etc. can be used suitably. Further, purified agarose may be used as the agar. Further, the aqueous solvent is not particularly limited as long as it is an aqueous component that can be used in the cosmetics and pharmaceutical fields. For example, glycols such as 1,3-butylene glycol and propylene glycol, ethanol, propanol and the like In addition to the lower alcohol, it can contain components generally blended as an aqueous phase component of cosmetics.

  The compounding amount of the agar pulverized gel in the present invention is 0.01 to 5% by mass, preferably 0.01 to 3% by mass, more preferably 0.01 to 1% by mass in terms of agar solid content. If the blending amount is less than 0.01% by mass, the thickening effect may not be sufficient, and even if blending exceeds 5% by mass, no further improvement in the effect can be obtained.

<(B) Neopentanoic acid ester derivative>
The ester derivative of neopentanoic acid has the following formula:
(Wherein A is an alkyl group, preferably an alkyl group having 7 to 20 carbon atoms)
Can be used.
Specific examples of the ester derivative of neopentanoic acid include isodecyl neopentanoate, isostearyl neopentanoate, octyldodecyl neopentanoate and the like. Of these, isodecyl neopentanoate is preferable because of its excellent effect of improving skin familiarity.
As a commercial item, what is marketed as a brand name "Neolite 100P" and "Neolite 180P" from the higher alcohol industry can be used, for example.

  The addition amount of the ester derivative of neopentanoic acid is preferably 0.1 to 7% by mass, more preferably 0.5 to 7% by mass, and still more preferably 1 to 3% by mass with respect to the total amount of the emulsified cosmetic. If it is 0.1 mass% or more, the skin familiarity can fully be improved. On the other hand, when it mixes more than 7 mass%, it tends to produce stickiness.

<(C) Linear low molecular weight silicone oil>
As the linear low molecular weight silicone oil, a dimethyl silicone oil having a kinematic viscosity at 25 ° C. of 100 cs or less, more preferably 50 cs or less is preferably used.

  Examples of commercially available products include TSF451-5A, TSF451-10A, TSF451-20A, TSF451-1100A (manufactured by Momentive), SH200 C Fluid 5cs, SH200 C Fluid 6cs, SH200 C Fluid 10cs, SH200 C Fluid 20cs, SH200 C Fluid 30cs, SH200 C Fluid 50cs, SH200 C Fluid 100cs (above, manufactured by Toray Dow Corning), KF-96L-0.65cs, KF-96L-1cs, KF-96L-1.5cs, KF-96L- 2cs, KF-96L-5cs, KF-96A-6cs, KF-96-10cs KF-96-20cs KF-96-30cs KF-96-50cs, KF-96-100 s (or, Shin-Etsu Chemical Co., Ltd.) and the like, preferably blended with one or more members selected from these as appropriate.

  0.1-15 mass% is preferable with respect to the emulsified cosmetics whole quantity, and, as for the addition amount of a linear low molecular weight silicone oil, 1-10 mass% is further more preferable. If it is less than 0.1% by mass, the skin familiarity and moist feel will be insufficient, and if it is added more than 15% by mass, the skin familiarity and moist feel tends to be impaired.

  The emulsified cosmetic according to the present invention is various components that are usually blended in the field of cosmetics and quasi-drugs, for example, surfactants, emulsifiers, powder components, solids, as long as the effects of the present invention are not impaired. Fats and oils, humectants, thickeners, sequestering agents, pigments, pH adjusters, skin nutrients, vitamins, preservatives, fragrances and the like can be appropriately blended as necessary.

  In particular, in order to impart a sufficient moisturizing effect, it is preferable to blend a moisturizing agent that has been conventionally used in cosmetics. Specific examples of the humectant include glycerin (for example, dynamite glycerin), polyhydric alcohols such as propylene glycol, 1,3-butylene glycol, and sorbitol, mucopolysaccharides such as hyaluronic acid and chondroitin sulfate, amino acids, and pyrrolidone carboxyl. Natural moisturizing factor (NMF) such as acid (PCA), lactic acid or the like, intracellular lipid or the like, plant extract, proteolysate such as soluble collagen, elastin, keratin, chitin, chitosan, yeast extract And seaweed extract.

  The emulsified cosmetic according to the present invention can be provided in the form of an oil-in-water type or a water-in-oil type emulsion, and can be produced according to a conventionally used method. For example, (b) an ester derivative of neopentanoic acid and (c) an oil phase component containing a linear low molecular weight silicone oil are mixed, (a) an aqueous phase component containing an agar pulverized gel is mixed, and an aqueous phase and an oil phase are mixed. And then emulsified with a homomixer or the like.

  The use of the emulsified cosmetic according to the present invention is not particularly limited, but can be applied to various products such as facial or body emulsions, creams, lotions, and the like.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in more detail, this invention is not limited by these Examples. Unless otherwise specified, the blending amount indicates mass%.

Emulsified cosmetics (samples) were prepared according to the formulation shown in Table 1 below, and each sample was applied to the cheeks with a professional panel of 10 people. The non-stickiness was evaluated according to the following evaluation criteria. The results are also shown in Table 1.
○: 8-10 out of 10 professional panels were evaluated as good ○ △: 5-7 out of 10 professional panels were evaluated as good △: 2-4 out of 10 professional panels were evaluated as good × : 0 to 1 out of 10 professional panelists rated it as good

* 1: Neolite 100P (manufactured by Higher Alcohol Industry Co., Ltd.)
* 2: Execol D-5 (Shin-Etsu Chemical Co., Ltd.)
* 3: KF-96L-1.5cs (manufactured by Shin-Etsu Chemical Co., Ltd.)
* 4: KF-96L-2cs (manufactured by Shin-Etsu Chemical Co., Ltd.)
* 5: KF-96L-20cs (manufactured by Shin-Etsu Chemical Co., Ltd.)

  As shown in Table 1, even when (a) agar ground gel and cyclomethicone are contained, (b) an ester derivative of neopentanoic acid and (c) a linear low molecular weight silicone oil are not contained. The moist feeling was insufficient and the skin familiarity was poor (Comparative Example 1). In addition, even when (b) isodecyl neopentanoate was blended with such an emulsion composition containing cyclomethicone, there was almost no change in moist feeling, and the skin familiarity was only slightly improved ( Comparative Example 4). Moreover, only by changing cyclomethicone to (c) linear low molecular weight silicone oil, the moist feeling was improved, but the skin familiarity was insufficient (Comparative Examples 2 and 3).

  On the other hand, by blending (b) isodecyl neopentanoate and (c) linear low molecular weight silicone oil, (a) while maintaining the non-stickiness of the agar pulverized gel, moist feeling and familiar skin Both goodness could be improved simultaneously (Example 1). These improvement effects were maintained even when the blending amount of (b) isodecyl neopentanoate and (c) linear low molecular weight silicone oil was changed within a predetermined range (Examples 2 to 5), (c) It was confirmed that when the amount of the linear low molecular weight silicone oil is too much, it becomes worse on both the moist feeling and the familiarity (Comparative Example 5).

  Moreover, although the comparative example 3 contains many tetraethylhexanoic acid pentaerythrityl instead of not containing neodecyl neopentanoate compared with Example 1, the skin familiarity was inadequate. Therefore, even if an ester oil different from the ester derivative of (b) neopentanoic acid is used together with (c) a linear low molecular weight silicone oil, sufficient skin familiarity cannot be achieved, and moist feeling In order to improve both the skin familiarity at the same time, it was confirmed that (b) an ester derivative of neopentanoic acid must be selected and blended with (c) a linear low molecular weight silicone oil.

Claims (3)

(A) 0.01-5% by mass in terms of agar solid gel in terms of agar solid content,
(B) The following formula:
( Wherein A is an alkyl group having 7 to 20 carbon atoms) an ester derivative of neopentanoic acid represented by 0.1 to 7% by mass, and (c) a linear chain having a kinematic viscosity at 25 ° C. of 100 cs or less 0.1-15% by mass of silicone oil
Contains emulsified cosmetics.   (B) The emulsified cosmetic composition according to claim 1, wherein the ester derivative of neopentanoic acid is isodecyl neopentanoate. (C) The emulsified cosmetic according to claim 1 or 2, wherein the linear silicone oil is a dimethyl silicone oil having a kinematic viscosity at 25 ° C of 100 cs or less.