JP2010120913A - Water-in-oil type emulsion composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-in-oil type emulsion composition which is good in extensibility, is free from tackiness, has a base-forming effect and is excellent in storage stability. <P>SOLUTION: The water-in-oil type emulsion composition contains (A) an evaporable silicone oil, (B) sorbitan monoisostearate and/or diglyceryl monoisostearate, and (C) a polyoxyalkylene alkyl-comodified organopolysiloxane represented by general formul (1) [wherein, R is H or a 1 to 5C alkyl; (x) is an integer of 5 to 50; (y) is an integer of 1 to 30; (a) is an integer of 2 to 20; (b) is an integer of 1 to 5; (c) is an integer of 2 to 20; (d) is an integer of 0 to 20]. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a water-in-oil emulsified composition having good spreading, no stickiness, a base effect, and excellent storage stability.

  It is known that water-in-oil emulsified cosmetics are well-familiar with the skin and prevent oil from transpiration by creating an oil film on the skin surface, protecting the skin from drying and moisturizing the skin. In addition, it is widely used in makeup cosmetics, sunscreen cosmetics and the like because of its excellent water repellency and low makeup loss. However, since the oil-in-water emulsified cosmetic is an external phase, the oil is heavy and sticky or feels bad in some cases. In recent years, in water-in-oil emulsified cosmetics, in order to obtain a refreshing and less sticky product, it has been studied to blend silicone oil as an oil agent or to blend water with a high content (Patent Documents 1 to 5). However, it has been difficult from the viewpoint of storage stability to add a large amount of silicone oil or water to the water-in-oil emulsified cosmetic. For this reason, a water-in-oil emulsified cosmetic with good storage stability over time, good spread, no stickiness and excellent usability has been desired.

JP-A-4-370152 JP-A-5-178733 JP-A-6-40847 JP 2001-58917 A JP 2001-139424 A

  Accordingly, an object of the present invention is to provide a water-in-oil emulsion composition that has good spreading, no stickiness, has a base effect, and is excellent in storage stability.

  The present invention for achieving the above object is represented by (A) volatile silicone oil, (B) sorbitan monoisostearate and / or diglyceryl monoisostearate, and (C) represented by the following general formula (1). It is in a water-in-oil emulsion composition containing a polyoxyalkylene alkyl co-modified organopolysiloxane.

(In the formula, R represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, x is 5 to 50, y is 1 to 30, z is 20 to 200, a is 2 to 20, b is 1 to 5) C represents an integer of 2 to 20, and d represents an integer of 0 to 20.)

  2nd this invention exists in said water-in-oil emulsion composition containing the bridge | crosslinking-type polyether modified silicone represented by (D) following General formula (2) further.

(Wherein p ₁ and p ₂ are 10 to 200, q is 1 to 10, and r is an integer of 3 to 20)

  The water-in-oil emulsified composition according to the present invention is excellent in storage stability, has excellent sensory characteristics that it does not feel sticky when applied externally to the skin, and also has excellent ground effect Have

Hereinafter, embodiments of the present invention will be described in detail. The volatile silicone oil used as the component (A) in the present invention is a silicone oil having a boiling point of 250 ° C. or lower under atmospheric pressure. For example, a cyclic dimethylpolysiloxane represented by the formula {(CH ₃ ) ₂ SiO} _m ( In the formula, m is an integer of 3 to 6, and a siloxane compound represented by the formula (CH ₃ ) ₃ SiO {(CH ₃ ) RSiO} _n Si (CH ₃ ) ₃ (wherein n is an integer of 0 to 4, R is a hydrocarbon group having 1 to 8 carbon atoms, —OSi (CH ₃ ) ₃ ), or a mixture thereof. Specific examples thereof include decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, caprylylmethicone, octamethyltrisiloxane, decamethyltetrasiloxane, methyltrimethicone and the like.

  The content of (A) volatile silicone oil in the water-in-oil emulsion composition of the present invention is preferably 1 to 40% by mass (hereinafter simply referred to as%), particularly preferably based on the total amount of the emulsion composition. Is 5-30%. Within these ranges, the refreshing feel of the volatile silicone is felt more strongly, and the storage stability of the emulsion composition is particularly excellent.

  The sorbitan monoisostearate used as the component (B) in the present invention is sorbitan fatty acid ester obtained by equimolar reaction of d-sorbitol obtained by reducing glucose or sorbitan which is an intramolecular dehydrate thereof and isostearic acid. It is. Similarly, diglyceryl monoisostearate used as the component (B) is a monoester obtained by reacting diglycerin, which is a dimer of glycerin, with isostearic acid.

The content of (B) sorbitan monoisostearate and / or diglyceryl monoisostearate in the water-in-oil emulsion composition of the present invention is preferably 0.1 to 3%, particularly preferably based on the total amount of the emulsion composition. Is 0.3 to 1.5%. If it is in these ranges, it is especially excellent in the storage stability of an emulsion composition, and the more excellent touch which does not give a sticky feeling also in a usability | use_condition is obtained. Among the components (B), sorbitan monoisostearate is particularly preferably used in the present invention because it is superior to diglyceryl monoisostearate in terms of good spreadability.

  The polyoxyalkylene alkyl co-modified organopolysiloxane used as the component (C) in the present invention is a known substance represented by the general formula (1). In particular, in the general formula, R is a hydrogen atom, x is 5 to 50, y is 1 to 15, z is 20 to 150, a is 14 to 18, b is 3, c is 3 to 11, and d is 0 to 0. No. 13 is easily used and preferably used because of its excellent effect. As a corresponding raw material, “ABIL EM90” manufactured by Goldschmidt is cited.

  The content of the (C) polyoxyalkylene alkyl co-modified organopolysiloxane in the water-in-oil emulsion composition of the present invention is preferably 0.1 to 3%, particularly preferably 0.8%, based on the total amount of the emulsion composition. 5 to 2%. If it is in these ranges, it will be especially excellent in the storage stability of an emulsion composition, and the more excellent feeling in the point of the ease of use will be obtained in a usability.

  In the present invention, a water-in-oil emulsified composition having a superior feel in terms of good spread and improved base effect by further blending a cross-linked polyether-modified silicone as component (D). be able to. The crosslinked polyether-modified silicone used in the present invention is represented by the following general formula (2).

(Wherein p ₁ and p ₂ are 10 to 200, q is 1 to 10, and r is an integer of 3 to 20)

  The crosslinked polyether-modified silicone used in the present invention can be produced by the methods described in JP-A-4-272932 and JP-A-5-140320.

  The cross-linked polyether-modified silicone used in the present invention is preferably a paste-modified polyether-modified silicone composition previously kneaded with silicone oil under a shearing force. As the silicone oil used here, a low-viscosity silicone oil having a viscosity of 100 mPa · s or less at 25 ° C. is preferably used. For example, dimethylpolysiloxane, methylphenylpolysiloxane, diethylpolysiloxane, ethylmethylpolysiloxane, ethylphenylpolysiloxane. Examples include chain silicone oils such as siloxane, and cyclic silicone oils such as hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, and tetradecamethylcycloheptasiloxane. These silicone oils can be used alone or in combination of two or more.

  Paste-like polyether-modified silicone compositions, which are kneaded products of a cross-linked polyether-modified silicone and silicone oil under a shearing force, are commercially available, for example, as the “KSG” series (manufactured by Shin-Etsu Chemical Co., Ltd.). Are available. In the present invention, it is particularly preferable to use KSG-21 or KSG-210 (manufactured by Shin-Etsu Chemical Co., Ltd.).

  The content of the (D) cross-linked polyether-modified silicone in the water-in-oil emulsion composition of the present invention is preferably 0.1 to 3%, particularly preferably 0.5 to 1, based on the total amount of the emulsion composition. .5%. If it is in these ranges, a more excellent effect can be obtained in terms of the feeling that it does not feel good stretchiness or stickiness.

  In the water-in-oil emulsion composition of the present invention, in addition to the above essential components, an ultraviolet absorber other than the above, an oil component other than the above, an emulsifier (surfactant), an ultraviolet scattering agent, a moisturizing agent, if necessary. Contains ingredients, powders, fragrances, preservatives, plant extracts, fluorine compounds, resins, stickers, salts, solvents, antioxidants, chelating agents, neutralizing agents, pH adjusters, insect repellents, bioactive ingredients, etc. can do.

  The water-in-oil emulsion composition of the present invention can be applied to skin cosmetics such as cosmetic creams, emulsions, sunscreen agents, and makeup bases.

  EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited to these. Prior to the examples, the evaluation methods employed in each example will be described.

<Evaluation of sensory characteristics>
Ten professional panelists applied the evaluation samples to the face and scored the feel (goodness of spread, no stickiness) in five stages according to the following evaluation criteria. The average score of 10 professional panelists was evaluated, and 4.0 or higher was evaluated as ◎, 3.0 or higher and lower than 4.0 as ◎, 2.0 or higher and lower than 3.0 as Δ, and less than 2.0 as X.

(Evaluation criteria)
5: Very favorable 4: Preferred 3: Neither 2: Unfavorable 1: Very unfavorable

<Earth effect>
Ten expert panelists apply the evaluation sample to the face, and then make up with a commercially available foundation. The foundation's applicability (whether it is evenly applied to the skin) and the makeup state after 5 hours have passed. Was scored in five steps according to the same evaluation criteria as above. The average score of 10 professional panelists was evaluated, and 4.0 or higher was evaluated as ◎, 3.0 or higher and lower than 4.0 as ◎, 2.0 or higher and lower than 3.0 as Δ, and less than 2.0 as X.

<Storage stability>
The evaluation sample was centrifuged (20 ° C., 5000 rpm, 1 hour) with a centrifuge (high-speed cooling centrifuge CR21G, manufactured by Hitachi Koki Co., Ltd.). The state after the treatment was visually observed and evaluated in 3 stages [◯: no change in state, Δ: slightly separated, x: clearly separated).

Examples 1-3, Comparative Examples 1-3 (cosmetic cream)
A water-in-oil emulsion composition (cosmetic cream) having the formulation shown in Table 1 was prepared by a conventional method, and each evaluation was performed. The results are also shown in Table 1. In addition, the compounding quantity in Table 1 is the mass%.

(Table 1)

  As shown in Table 1, the examples of the present invention had good stretch, no stickiness, excellent ground effect, and excellent storage stability. On the other hand, it can be seen that the comparative example lacking any of the essential components is inferior in any of sensory characteristics, ground effect, and storage stability.

Example 4 (sunscreen agent)
Raw material name Compounding amount (% by mass)
――――――――――――――――――――――――――――――――――――
1. Decamethylcyclopentasiloxane 12.0
2. Caprylyl Methicone 10.0
3. Sorbitan monoisostearate 1.2
4. Polyoxyalkylene alkyl co-modification 1.0
Organopolysiloxane (Note 1)
5. Cross-linked polyether-modified silicone mixture (Note 3) 4.0
6. Polyoxyalkylene-modified silicone mixture (Note 4) 5.0
7. Dimethylpolysiloxane (6cs) 5.0
8. Methylphenylpolysiloxane (Note 5) 5.0
9. Silicone-treated fine particle zinc oxide 15.0
10. 1,3-Butylene glycol 7.0
11. Stearyl glycyrrhizinate 0.1
12. Phenoxyethanol 0.3
13. Purified water balance ――――――――――――――――――――――――――――――――――――
Note 4: BY22-008 (manufactured by Toray Dow Corning)
Note 5: SH-556 (manufactured by Toray Dow Corning)

  When a water-in-oil emulsion composition (sunscreen agent) having the above composition was prepared and evaluated, it showed good spreading, no stickiness, excellent base effect, and excellent storage stability.

The silicone-treated fine particle zinc oxide used in Example 4 was prepared as follows. 96 parts by mass of fine particle zinc oxide ZnO350 (Sumitomo Osaka Cement, average primary particle size 20 nm, specific surface area 45 m ² / g) and 4 parts by mass of methyl hydrogen polysiloxane HRS-2 (Shin-Etsu Chemical Co., Ltd.) After mixing with 400 parts by mass to form a slurry, the mixture was heated under reduced pressure to remove hexane, and the resulting powder was pulverized using an atomizer (pin mill) and transferred to a stainless steel bat. A stainless steel bat is placed in a gas dryer having a blast airflow type and having a heat exchanger, heated from room temperature to 180 ° C. over 2 hours, and then dried at 180 ° C. for 10 hours to obtain silicone-treated fine zinc oxide. It was.

  The water-in-oil emulsion composition of the present invention has good spread, no stickiness, excellent base effect, excellent storage stability, skin cosmetics such as cosmetic creams, emulsions, sunscreen agents, cosmetic bases, etc. It can be used as

Claims (2)

(A) volatile silicone oil, (B) sorbitan monoisostearate and / or diglyceryl monoisostearate, and (C) a polyoxyalkylene alkyl co-modified organopolysiloxane represented by the following general formula (1) A water-in-oil emulsion composition.
(In the formula, R represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, x is 5 to 50, y is 1 to 30, z is 20 to 200, a is 2 to 20, b is 1 to 5) C represents an integer of 2 to 20, and d represents an integer of 0 to 20.) The water-in-oil emulsion composition according to claim 1, further comprising (D) a crosslinked polyether-modified silicone represented by the following general formula (2).
(Wherein p ₁ and p ₂ are 10 to 200, q is 1 to 10, and r is an integer of 3 to 20)