JP6620539B2 - Soft scrub agent and skin cosmetic containing the same - Google Patents

Description

  The present invention is a soft scrub agent that has a moderate scrub feeling when used in skin cosmetics, does not feel sticky after use, has a moisturizing feeling but is not sticky, and provides a massage effect, And a skin cosmetic containing the same.

Conventionally, scrubbing agents have been blended for the purpose of enhancing the massage effect and cleaning effect in massage fee such as body gel and cleansing fee such as facial cleansing foam. However, scrubbing agents such as plant seeds, crushed shells, and synthetic resins that have been used in the past have a high hardness and may have a strong scrub feeling during use.
Therefore, a soft type scrub agent such as konjac mannan is preferably used. For example, a scrub agent (Patent Document 1) containing microbial-produced cellulose or sugarcane lining residue as an active ingredient (Patent Document 1) and a scrub agent containing konjac mannan gel particles or glucomannan gel particles (Patent Documents 2 to 4) have been proposed. .
These soft-type scrub agents no longer feel that the scrub feel is strong, but conversely, if too soft, there is a problem that the massage effect that gives a tight feeling after use cannot be fully exhibited. For this problem, a scrub agent composition (Patent Document 5) composed of fibrous cellulose and glucomannan has been proposed.

  However, it is difficult to impregnate any of the scrub agents of Patent Documents 1 to 5 with oil-soluble components such as a moisturizing agent, which may give a feeling of tension after use. There wasn't. Moreover, even if an oil-soluble component was blended, stickiness might occur, and there was nothing that was sufficiently satisfactory.

JP 2007-91717 A JP 2000-344801 A JP 2001-131054 A JP 2006-169300 A JP 2010-18704 A

  The present invention is a soft scrub agent that has a moderate scrub feeling when used in skin cosmetics, does not feel sticky after use, has a moisturizing feeling but is not sticky, and provides a massage effect, And it aims at providing the skin cosmetics containing it.

  As a result of intensive studies to solve the above problems, the present inventors have found that a composition containing the following components (A) to (C) at a predetermined ratio as a soft scrub agent that can solve the above problems. As a result, the present invention was completed.

That is, the present invention has the following component (A) 2 to 16 wt%, 75 to 97 wt% of the following component (B) and the following component (C) contains from 0.4 to 9 wt%, the powder average particle size There is a soft scrub agent Ru 100~3000μm der.
(A) A hydride mixture of a triblock copolymer composed of a block composed of an aromatic vinyl compound unit and a block composed of a diene compound unit having 4 to 5 carbon atoms, and having a weight average molecular weight of 100,000 to 180,000 The hydride (a1) less than the above and the hydride (a2) having a weight average molecular weight of 180,000 or more and 300,000 or less in a mass ratio of (a1) / (a2) = 95/5 to 50/50 Mixture of hydrides (B) Hydrocarbon oil having a kinematic viscosity at 37.8 ° C. of 5 to 50 mm ² / s (C) Silicone oil having a kinematic viscosity at 25 ° C. of 50 to 200 mm ² / s It is a skin cosmetic containing 0.5 to 20% by mass of the soft scrub agent of the present invention.
The skin cosmetic of the present invention preferably further contains 0.01 to 15% by mass of an alkylene oxide derivative represented by the following formula (I).
Z- {O (PO) l (EO) m- (BO) nH} a (I)
(In the formula, Z is a residue excluding the hydroxyl group of a compound having 3 to 9 hydroxyl groups, a is 3 to 9, PO is an oxypropylene group, EO is an oxyethylene group, and l and m are oxypropylene groups, The average added mole number of oxyethylene groups is 1 ≦ l ≦ 50, 1 ≦ m ≦ 50, and the mass ratio of PO to EO (PO / EO) is 1/5 to 5/1. PO and EO Are added randomly, BO is an oxybutylene group, n is the average number of moles added, and 0.5 ≦ n ≦ 5.

  The soft scrub agent of the present invention has a moderate scrub feeling when used in skin cosmetics, has no feeling of stickiness after use, has a moisturizing feeling but does not have stickiness, and provides a massage effect Is. Moreover, the skin cosmetics of this invention show the said effect by the soft scrub agent of this invention.

  Embodiments of the present invention will be described below. First, the soft scrub agent will be described.

[Soft scrub agent]
The soft scrub agent of the present invention contains at least the following components (A), (B) and (C).

((A) component)
(A) component in this invention is a mixture of the hydride of the block copolymer of an aromatic vinyl compound and a C4-C5 diene compound. The block copolymer is a triblock copolymer composed of a block composed of an aromatic vinyl compound unit and a block composed of a diene compound unit having 4 to 5 carbon atoms.
Examples of the component that forms a block composed of an aromatic vinyl compound unit include styrene, α-methylstyrene, vinylnaphthalene, 3-methylstyrene, and 4-propylstyrene. Among these, styrene is particularly preferable. .
Moreover, as a component which forms the block which consists of a C4-C5 diene compound unit, although an isoprene, a butadiene, etc. are mentioned, for example, an isoprene and a butadiene are especially preferable among these.

In the hydride of the triblock copolymer in the present invention, the block composed of the aromatic vinyl compound unit and the block composed of the diene compound unit form a triblock copolymer, and further a double of the block composed of the diene compound unit. It is a hydride of a block copolymer in which the bonding portion is hydrogenated.
Examples of the hydride of the triblock copolymer in the present invention include, for example, a styrene / isoprene / styrene triblock copolymer hydride (styrene / ethylene / propylene / styrene block copolymer (hereinafter abbreviated as “SEPS”). )), Hydride of styrene / butadiene / styrene triblock copolymer (styrene / ethylene / butylene / styrene block copolymer (hereinafter sometimes abbreviated as “SEBS”)), or these A mixture of these can be suitably used.

In the present invention, (A) a hydride of a triblock copolymer is a mixture of hydrides of two types of triblock copolymers having different weight average molecular weights.
Of this mixture, the low molecular weight triblock copolymer hydride (a1) has a weight average molecular weight in the range of 100,000 to less than 180,000, preferably in the range of 100,000 to 150,000. If the weight average molecular weight of the hydride (a1) is too low, the resulting soft scrub agent may not have sufficient hardness and elongation, and it may be difficult to obtain a massage effect.
The hydride (a2) of the high molecular weight triblock copolymer in this mixture has a weight average molecular weight in the range of 180,000 to 300,000, preferably in the range of 220,000 to 280,000. is there. If the weight average molecular weight of the hydride (a1) is too high, stickiness may be felt.

  The weight average molecular weight (Mw) in the hydride (a1, a2) of the two types of weight average molecular weight triblock copolymers is measured by GPC measurement under the following conditions using, for example, tetrahydrofuran (THF) as a mobile phase, It can obtain | require by polystyrene conversion.

<GPC measurement conditions>
Apparatus: GPC-8220 (manufactured by Tosoh Corporation)
Column: Shodex LF-804 (manufactured by Showa Denko KK)
Temperature: 40 ° C
Solvent: THF
Flow rate: 1.0 ml / min.
Sample: Concentration 0.05-0.6% by mass
Injection volume: 0.1ml

As described above, in the present invention, a mixture of two types of triblock copolymer hydrides (a1, a2) having different weight average molecular weights is used, and a hydride (a1) of a low molecular weight triblock copolymer is used. And the hydride (a2) content of the high molecular weight triblock copolymer is a mass ratio in the range of (a1) / (a2) = 95/5 to 50/50, preferably 90 / It is 10-60 / 40, Most preferably, it is 80 / 20-70 / 30.
If the blending ratio of the low molecular weight triblock copolymer hydride (a1) is too high at the mass ratio, the resulting soft scrub agent will have insufficient hardness and elongation, making it difficult to obtain a massage effect. There is. Further, if the content ratio of the hydride (a1) of the low molecular weight triblock copolymer is too low, stickiness may be felt.

  The content of the component (A) in the soft scrub agent of the present invention is in the range of 2 to 16% by mass, preferably in the range of 4 to 14% by mass, particularly preferably in the range of 5 to 12% by mass. is there. When the content of the component (A) is too small, the soft scrub agent becomes too soft and it becomes difficult to maintain the shape, and a sufficient massage effect may not be obtained. On the other hand, if the content of the component (A) is too large, the soft scrub agent becomes hard and it may be difficult to obtain an appropriate scrub feeling.

((B) component)
The component (B) in the present invention is an aliphatic hydrocarbon oil having a kinematic viscosity at 37.8 ° C. of 5 to 50 mm ² / s, and is not particularly limited as long as it is a compound composed of carbon and hydrogen. Any of hydrocarbon oil and unsaturated aliphatic hydrocarbon oil may be sufficient.
Examples of the saturated aliphatic hydrocarbon oil include liquid paraffin, hydrogenated polyisobutene, α-olefin oligomer, squalane and the like. Examples of the unsaturated aliphatic hydrocarbon oil include squalene and polybutene. Of these, saturated aliphatic hydrocarbon oils are preferably used because stickiness hardly occurs, and hydrogenated polyisobutene can be particularly preferably used.
(B) A component can be used individually by 1 type or in combination of 2 or more types.

(B) an aliphatic hydrocarbon oil as the component, a kinematic viscosity at 37.8 ° C. is in the range of 5 to 50 mm ² / s, preferably 10 to 30 mm ² / s, particularly preferably 10 to 20 mm ² / Within the range of s. If the kinematic viscosity is too high, stickiness may be felt.
The kinematic viscosity of component (B) is obtained by measuring at a test temperature of 37.8 ° C. using a Canon Fenceke viscometer according to “5. Kinematic viscosity test method” of JIS K 2283: 2000. Can do.

  The content of the component (B) in the soft scrub agent of the present invention is in the range of 75 to 97% by mass, preferably in the range of 80 to 95% by mass, particularly preferably in the range of 84 to 93% by mass. is there. When there is too little content of (B) component, the hardness and elongation of a soft scrub agent may become inadequate and it may become difficult to obtain a massage effect. On the other hand, when there is too much content of (B) component, a soft scrub agent will become soft too much and it will become difficult to maintain a shape.

((C) component)
Component (C) in the present invention is a silicone oil having a kinematic viscosity at 25 ° C. of 50 to 200 mm ² / s. For example, dimethylpolysiloxane, phenyl-modified polysiloxane, amino-modified polysiloxane, polyether-modified dimethylpolysiloxane And cyclic dimethylpolysiloxane. Among them, dimethylpolysiloxane can be preferably used because it is difficult to produce a feeling of tension.
(C) A component can be used individually by 1 type or in combination of 2 or more types.

Component (C) has a kinematic viscosity at 25 ° C. in the range of 50 to 200 mm ² / s, preferably in the range of 70 to 150 mm ² / s, and particularly preferably in the range of 80 to 120 mm ² / s. . If the kinematic viscosity is too high, stickiness may be felt.
As for the kinematic viscosity of component (C), as with component (B), a test temperature of 25 ° C. was used using a Canon Fenceke viscometer according to “5. Kinematic viscosity test method” of JIS K 2283: 2000. It can obtain by measuring by.

  The content of the component (C) in the soft scrub agent of the present invention is in the range of 0.4 to 9% by mass, preferably in the range of 1 to 6% by mass, particularly preferably in the range of 2 to 5% by mass. Is within. (C) When there is too little content of a component, a feeling of tension may be felt. On the other hand, when there is too much content of (C) component, stickiness may be felt.

  The soft scrub agent of the present invention includes a stabilizer, an antioxidant, a light stabilizer, a colorant, a pigment (for example, titanium oxide, zinc oxide, etc.), a fragrance, and an inorganic powder (insofar as the object of the present invention is not impaired. For example, any additive such as alumina, talc, mica, calcium carbonate, clay, etc.), organic powder (eg, PE, PP, silicone resin powder, etc.) can be included.

  The soft scrub agent of the present invention can be produced by mixing and pulverizing the various components described above using any known means. Mixing can be performed, for example, by supplying various blending components simultaneously or in any order into a mixing apparatus, and melt mixing. For this melt-mixing, for example, a single-screw extruder, a twin-screw extruder, a roll, a Banbury mixer, various kneaders, a compounding pot, or the like can be used. After melt-mixing various components, the melt mixture is cooled without any particular limitation, and then the mixture is pulverized. The pulverization can be performed using a pulverizer such as a cutter mill, a hammer mill, a pin mill, a jet mill, a rotary mill, and a vibration mill. If necessary, it may be ground together with an excipient such as silica. For example, you may perform the freezing grinding | pulverization which grind | pulverizes in the state which frozen the mixture using liquid nitrogen.

  The powder average particle diameter of the soft scrub agent of the present invention can be measured using, for example, a laser diffraction type particle size distribution measuring apparatus. The average particle diameter of the powder is not particularly limited, but 100-3000 μm is appropriate when measured with a laser diffraction particle size distribution analyzer (SALD-2100, manufactured by Shimadzu Corporation) at a concentration of about 200 ppm using ethanol as a solvent. Since a good scrub feeling and excellent massage effect can be obtained sufficiently, it can be preferably used.

[Skin cosmetic]
The skin cosmetic containing the soft scrub agent of the present invention has an appropriate scrub feeling, does not feel sticky after use, has a moisturizing feeling but is not sticky, and provides a massage effect. In order to sufficiently obtain such an effect, the soft scrub agent of the present invention is 0.5 to 20% by mass, preferably 1 to 15% by mass, particularly preferably 1 to 10% by mass, based on the skin cosmetic. Contained. If the content of the soft scrub agent is too small, it may be difficult to obtain a massage effect and a moisturizing feeling, and if it is too much, the skin may be irritated or sticky.
In addition, the skin cosmetics of this invention can use the soft scrub agent of this invention individually by 1 type or in combination of 2 or more types.

(Alkylene oxide derivative represented by the formula (I))
When the skin cosmetic of the present invention further contains 0.01 to 15% by mass of an alkylene oxide derivative represented by the following formula (I), the feeling of stickiness and stickiness after use can be further reduced.

  Z- {O (PO) l (EO) m- (BO) nH} a (I)

  Z in the formula (I) is a residue excluding a hydroxyl group of a compound having 3 to 9 hydroxyl groups. Examples of the compound having 3 to 9 hydroxyl groups include glycerin, trimethylolpropane, erythritol, pentaerythritol, sorbitan, alkylglycoside, diglycerin, xylitol, dipentaerythritol, sorbitol, inositol, sucrose, trehalose, maltitol Or a mixture thereof. Moreover, a in Formula (I) is the number of hydroxyl groups of Z, and is a = 3-9. Preferably, Z is a residue excluding the hydroxyl group of the compound having 3 to 6 hydroxyl groups, and satisfies 3 ≦ a ≦ 6.

PO is an oxypropylene group, EO is an oxyethylene group, l and m are the average added moles of PO (propylene oxide) and EO (ethylene oxide), respectively, and 1 ≦ l ≦ 50, preferably 2 ≦ l ≦ 20 1 ≦ m ≦ 50, preferably 2 ≦ m ≦ 20. The mass ratio of PO to EO (PO / EO) is 1/5 to 5/1, preferably 1/4 to 4/1. PO and EO are randomly added.
BO represents an oxybutylene group. n is the average added mole number of BO, 0.5 ≦ n ≦ 5, preferably 0.8 ≦ n ≦ 3, and more preferably 1 ≦ n ≦ 3. BO (butylene oxide) is added in block form to the terminal of the alkylene oxide derivative. The compound giving an oxybutylene group is 1,2-butylene oxide.
The alkylene oxide derivative represented by the formula (I) in the present invention can be produced by a known method. As a commercial item of the alkylene oxide derivative represented by the formula (I), for example, “WILBride (registered trademark) S-753” and “WILBride (registered trademark) MG-2070” manufactured by NOF Corporation can be used. .
In addition, "WILBIDE (registered trademark) S-753" is an alkylene oxide derivative represented by the formula (I), wherein Z is a group other than the hydroxyl group of glycerin having three hydroxyl groups, a is 3, l is 5, m is 8, PO / EO is 5/8, PO and EO are randomly added, and n is 3.

  The alkylene oxide derivative represented by the formula (I) is contained in the skin cosmetic in an amount of 0.01 to 15% by mass, preferably 0.05 to 10% by mass, more preferably 0.1 to 5% by mass. If the content is too small, it may be difficult to obtain a feeling of stickiness and stickiness after use, and if it is too much, stability over time may be deteriorated.

It is also possible to mix the skin cosmetic of the present invention with additives commonly used in cosmetics and pharmaceuticals as long as the effects of the present invention are not impaired.
Moreover, the dosage form of the skin cosmetics of this invention is not specifically limited, For example, arbitrary dosage forms, such as solid substance, liquid form, emulsion, gel form, and cream form, can be taken.

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. First, the preparation method of the soft scrub agent mix | blended with skin cosmetics is demonstrated.

(Method for preparing soft scrub agent)
With the blending ratios shown in Table 1, components (A) to (C) were charged into a separable flask, melted and mixed at 140 ° C. for 5 hours, and then allowed to cool to room temperature. The obtained mixture was pulverized using a freeze pulverizer (manufactured by Nippon Analytical Industrial Co., Ltd.). About 1 g of the obtained mixture and a tungsten carbide steel ball were placed in a sample container, a grinding rod was attached to the main body, and the entire sample container was immersed in liquid nitrogen for 15 minutes. Thereafter, the grinding rod was reciprocated up and down for 10 minutes to obtain a soft scrub agent.

(Examples 1-5, Comparative Example 1)
A method for preparing a body gel will be described as an example of a skin cosmetic.
In the blending ratio shown in Table 3, soft scrub agents 1 to 3 or mannan of Table 1 (Comparative Example 1 only), Common Addition Component 1 of Table 2, alkylene oxide derivative represented by Formula (I) (Example 5 only) After adding ion-exchanged water to a beaker and stirring at room temperature for 10 minutes, potassium hydroxide was added to pH 5.5, and stirring was further performed for 5 minutes to obtain a body gel.

  20 women (25 to 45 years old) were panelists, and the obtained gel was applied to the forearm, massaged for 3 minutes, wiped off with tissue, and the following items were judged and evaluated. The results are shown in Table 3.

(Examples 6 to 9, Comparative Example 2)
A method for preparing a face-washing foam will be described as an example of skin cosmetics.
In the blending ratio shown in Table 5, the common additive component 2 in Table 4, the alkylene oxide derivative represented by the formula (I) (only Example 9) and ion-exchanged water were charged into a beaker and stirred at 80 ° C. for 10 minutes. Potassium hydroxide was added to pH 9 and the mixture was further stirred for 10 minutes. Then, it cooled, continuing stirring, the soft scrub agents 1-3 of Table 1 or mannan (only the comparative example 2) was added at about 60 degreeC, and the face-washing foam was obtained by cooling, continuing stirring to 40 degrees C or less. .

  Twenty women (25 to 45 years old) were panelists, and after washing their faces with the obtained face-washing foam, the following items were judged and evaluated. The results are shown in Table 5.

(1) Scrub feeling (judgment)
2 points: When the feel of scrub during use is moderate.
1 point: When the scrub feels slightly soft when used.
0 point: When the feel of the scrub at the time of use was too soft and was not felt so much.
(Evaluation)
The total score of 20 people was calculated and evaluated as follows.
A: Total score of 35 points or more and 0 points of 0: A skin cosmetic material having an appropriate scrub feeling.
◯: Total score of 25 points or more and less than 35 points, or total score of 35 points or more and 0 point of 1 or more and 2 or less: Although it feels somewhat soft, it is a skin cosmetic having a scrub feeling.
(Triangle | delta): Total score is 15 points or more and less than 25 points | pieces: It is a skin cosmetic which is soft and has a little scrub feeling.
X: The total score is less than 15: It is a skin cosmetic that is too soft and does not have a scrub feeling.

(2) Tightness (judgment)
2 points: When you feel that there is no tension after use.
1 point: When you feel that there is almost no tension after use.
0 points: When a feeling of tension is felt after use.
(Evaluation)
The total score of 20 people was calculated and evaluated as follows.
A: Total score of 35 points or more and 0 points: 0: A skin cosmetic that does not have a feeling of tension.
○: Total score is 25 points or more and less than 35 points, or total point is 35 points or more and 0 point is 1 or more and 2 or less people: skin cosmetics with almost no feeling of tension.
(Triangle | delta): A total score is 15 points or more and less than 25 points: It is skin cosmetics with a slight feeling of tension.
X: The total score is less than 15: It is a skin cosmetic with a feeling of tension.

(3) Moisturizing feeling (judgment)
2 points: When the skin feels moist.
1 point: When the skin feels slightly moist.
0 points: When the skin feels slightly dry.
(Evaluation)
The total score of 20 people was calculated and evaluated as follows.
A: Total score of 35 points or more and 0 points: 0: A skin cosmetic excellent in moisturizing feeling.
○: Total score is 25 points or more and less than 35 points, or total point is 35 points or more and 0 point is 1 or more and 2 or less people: A skin cosmetic with a moisturizing feeling.
(Triangle | delta): Total score is 15 points or more and less than 25 points: It is a skin cosmetic with a slightly insufficient moisturizing feeling.
X: The total score is less than 15: a skin cosmetic with insufficient moisturizing feeling.

(4) Stickiness (Judgment)
2 points: When there is no stickiness.
1 point: When you feel almost no stickiness.
0 point: When it feels sticky.
(Evaluation)
The total score of 20 people was calculated and evaluated as follows.
A: Total score of 35 points or more and 0 points: 0: A skin cosmetic with no stickiness.
○: The total score is 25 points or more and less than 35 points, or the total score is 35 points or more and 0 point is 1 or more and 2 or less: It is a skin cosmetic with almost no stickiness.
(Triangle | delta): It is skin cosmetics with a total point of 15 points or more and less than 25 points | pieces: Stickiness slightly.
X: Total score is less than 15: It is a skin cosmetic with stickiness.

(5) Massage effect (Judgment)
2 points: When a massage effect is felt.
1 point: If you feel a little massage effect.
0 point: When it feels that there is no massage effect.
(Evaluation)
The total score of 20 people was calculated and evaluated as follows.
A: Total score of 35 points or more and 0 points: 0: Skin cosmetic with excellent massage effect.
◯: Total score of 25 points or more and less than 35 points, or total score of 35 points or more and 0 point of 1 or more and 2 or less: Skin cosmetics having a massage effect.
(Triangle | delta): Total score is 15 points or more and less than 25 points: It is skin cosmetics with a little massage effect.
X: Total score is less than 15: Skin cosmetics with insufficient massage effect.

The skin cosmetics of the present invention (Examples 1 to 9) had a moderate scrub feeling, no stickiness after use, no stickiness while giving a moisturizing feeling, and a massage effect was obtained.
On the other hand, in Comparative Examples 1 and 2, sufficient performance is not obtained.
In Comparative Examples 1 and 2, since the mannan that is not impregnated with the oil-soluble component is used instead of the soft scrub agent of the present invention, there is no stickiness, but the moisturizing feeling is not sufficient, and a feeling of tension after use is felt. Feeling, massage effect is not enough.

The soft scrub agent of the present invention can be suitably used for skin cosmetics such as body gels, facial cleansing foams, body creams, cleansing creams and cleansing gels.

Claims (3)

2-16 mass% of the following (A) component, 75-97 mass% of the following (B) component and 0.4-9 mass% of the following (C) component are contained, and a powder average particle diameter is 100-3000 micrometers. soft scrub agent Ru Oh.
(A) A hydride mixture of a triblock copolymer composed of a block composed of an aromatic vinyl compound unit and a block composed of a diene compound unit having 4 to 5 carbon atoms, and having a weight average molecular weight of 100,000 to 180,000 The hydride (a1) less than the above and the hydride (a2) having a weight average molecular weight of 180,000 or more and 300,000 or less in a mass ratio of (a1) / (a2) = 95/5 to 50/50 Mixture of hydrides (B) Hydrocarbon oil having a kinematic viscosity at 37.8 ° C. of 5 to 50 mm ² / s (C) Silicone oil having a kinematic viscosity at 25 ° C. of 50 to 200 mm ² / s   A skin cosmetic comprising 0.5 to 20% by mass of the soft scrub agent according to claim 1. Furthermore, the skin cosmetics of Claim 2 containing 0.01-15 mass% of alkylene oxide derivatives shown by following formula (I).
Z- {O (PO) l (EO) m- (BO) nH} a (I)
(In the formula, Z is a residue excluding the hydroxyl group of a compound having 3 to 9 hydroxyl groups, a is 3 to 9, PO is an oxypropylene group, EO is an oxyethylene group, and l and m are oxypropylene groups, The average added mole number of oxyethylene groups is 1 ≦ l ≦ 50, 1 ≦ m ≦ 50, and the mass ratio of PO to EO (PO / EO) is 1/5 to 5/1. PO and EO Are added randomly, BO is an oxybutylene group, n is the average number of moles added, and 0.5 ≦ n ≦ 5.