JP7570677B2 - Skin cosmetics - Google Patents

Description

The present invention relates to skin cosmetics, and in particular to skin cosmetics that are thick when applied, have good affinity and spreadability on the skin, are not sticky, and provide a long-lasting moist feeling.

In recent years, in addition to the efficacy of maintaining or improving skin condition, skin cosmetics are being sought after for a variety of usability features in response to consumer preferences. Among the usability features of skin cosmetics, there is high demand from consumers for a usability that gives the cosmetic a sense of luxury when applied.

Conventionally, thickeners have been used in skin cosmetics to increase the thickness of the skin when applied. Skin cosmetics containing thickeners increase the thickness of the skin when applied, but if too much thickener is used, the skin does not blend well or spread well, and there are problems with the feel when used, such as stickiness.

Patent Document 1 discloses that an oil-in-water emulsion cosmetic, which is characterized by the blending of higher fatty acids and higher alcohols that are solid at room temperature, a surfactant, an acrylamide thickener, and hydroxypropyl methylcellulose, has improved thickness when applied, compatibility with the skin, stickiness, and slightly improved spreadability.

Patent Document 2 discloses that a skin cosmetic preparation characterized by containing an alkyl glucoside derivative, polyethylene glycol, and a polymeric compound improves the thickness, spread, stickiness, and sustained moist feeling when applied.

Patent Document 3 discloses that a skin cosmetic preparation characterized by containing a polyhydric alcohol and/or an amino acid, a polyoxyalkylene alkyl glucoside, a polyoxyethylene sorbitol fatty acid ester, and a water-soluble polymer improves the thickness upon application, compatibility with the skin, stickiness, and sustained moist feeling.

JP 2019-89741 A JP 2016-98219 A JP 2014-148471 A

However, Patent Documents 1 to 3 do not fully explore skin cosmetics that fully satisfy all of the following requirements: thickness when applied, compatibility with the skin, good spreadability, non-stickiness, and sustained moisturizing sensation, and further study is needed.

The objective of the present invention is to provide a skin cosmetic that is thick when applied, spreads well on the skin, is not sticky, and provides a long-lasting moist feeling.

The present inventors have discovered that a skin cosmetic containing (A) an (ammonium acryloyldimethyltaurate/VP) copolymer, (B) one or more selected from an acryloyldimethyltaurate salt copolymer other than component (A) or an acrylic acid/alkyl methacrylate copolymer, (C) an alkyl glucoside derivative, and (D) a higher alcohol having 12 to 24 carbon atoms has a good thickness when applied, is well absorbed and spreads on the skin, is not sticky, and provides a long-lasting moist feeling, leading to the completion of the present invention.

The present invention provides a skin cosmetic that is thick when applied, spreads well on the skin, is not sticky, and provides a long-lasting moist feeling.

The present invention will be described in detail below. Note that all units indicating content are mass% unless otherwise specified.

The present invention contains (A) (ammonium acryloyldimethyltaurate/VP) copolymer from the viewpoint of compatibility with the skin and ease of spreading.

The content of the component (A) used in the present invention is preferably 0.01 to 1%, more preferably 0.02 to 0.5%, and even more preferably 0.05 to 0.3%. If the content of the component (A) is less than 0.01%, there is a risk that the skin will not blend well and spread well. If the content of the component (A) is more than 1%, the skin cosmetic will harden, which may result in poor blending and spreading on the skin and stickiness.

From the viewpoints of thickness when applied, compatibility with the skin, good spreadability, and sustained moist feeling, the present invention contains (B) one or more selected from acryloyldimethyltaurate salt copolymers other than component (A) or acrylic acid/alkyl methacrylate copolymers.

The acryloyldimethyltaurate salt copolymer other than the component (A) of the component (B) used in the present invention is not particularly limited, but may be, for example, (ammonium acryloyldimethyltaurate/beheneth-25 methacrylate) crosspolymer, (HEA/sodium acryloyldimethyltaurate/steareth-20 methacrylate) copolymer, (acrylamide/sodium acryloyldimethyltaurate/acrylic acid) copolymer, (acrylamide/sodium acryloyldimethyltaurate) copolymer, (sodium acrylate/sodium acryloyldimethyltaurate/acrylamide) copolymer, (sodium acrylate/sodium acryloyldimethyltaurate) copolymer, (hydroxyethyl acrylate/sodium acryloyldimethyltaurate) copolymer, (sodium acryloyldimethyltaurate/PEG-8 diacrylate) Examples of such crosspolymers include (sodium acryloyldimethyltaurate/methacrylamidolauric acid) copolymer, (ammonium acryloyldimethyltaurate/carboxyethylammonium acrylate) crosspolymer, (ammonium acryloyldimethyltaurate/steareth-25 methacrylate) crosspolymer, (ammonium acryloyldimethyltaurate/steareth-8 methacrylate) copolymer, (ammonium acryloyldimethyltaurate/laureth-7 methacrylate) copolymer, (dimethylacrylamide/sodium acryloyldimethyltaurate) crosspolymer, sodium polyacryloyldimethyltaurate, ammonium polyacryloyldimethyltaurate, polyacrylate crosspolymer-6, polyacrylate crosspolymer-11, and polyacrylate-13.

The acrylic acid/alkyl methacrylate copolymer of component (B) used in the present invention is not particularly limited, but examples thereof include (acrylates/alkyl acrylate (C10-30)) crosspolymer.

Among the components (B) used in the present invention, from the viewpoints of thickness upon application, compatibility with the skin, good spreadability, and sustained moisturizing sensation, (ammonium acryloyldimethyltaurate/beheneth-25 methacrylate) crosspolymer and (acrylates/alkyl acrylate (C10-30)) crosspolymer are preferred, and among these, (ammonium acryloyldimethyltaurate/beheneth-25 methacrylate) crosspolymer is preferred.

Among the components (B) used in the present invention, it is preferable to use (ammonium acryloyldimethyltaurate/beheneth-25 methacrylate) crosspolymer and (acrylates/alkyl acrylate (C10-30)) crosspolymer in combination in order to improve compatibility with the skin.

The content of the (B) component used in the present invention is preferably 0.01 to 1%, more preferably 0.02 to 0.5%, and even more preferably 0.05 to 0.4%. If the (B) component is less than 0.01%, there is a risk that the thickness upon application, compatibility with the skin, good spreadability, and sustained moist feeling may not be obtained. If the (B) component is more than 1%, the skin cosmetic may become hard, which may result in poor compatibility and spreadability on the skin, and stickiness.

The present invention contains (C) an alkyl glucoside derivative from the viewpoints of thickness upon application and sustained moist feeling.

The component (C) used in the present invention is not particularly limited, but examples thereof include methyl gluceth-10, methyl gluceth-20, PPG-10 methyl glucose, PPG-20 methyl glucose, alkyl (C12-20) glucoside, decyl glucoside, hydroxystearyl glucoside, polyoxypropylene carboxyalkyl (C14-18) diglucoside, lauryl glucoside, and (C12-20) alkyl glucoside. The component (C) may contain one or more types.

Among the components (C) used in the present invention, methyl gluceth-10, methyl gluceth-20, PPG-10 methyl glucose, and PPG-20 methyl glucose are preferred from the viewpoints of thickness upon application and sustained moisturizing feeling, with methyl gluceth-10 and methyl gluceth-20 being particularly preferred.

The content of the (C) component used in the present invention is preferably 0.1 to 15%, more preferably 0.5 to 8%, and even more preferably 1 to 4%. If the (C) component is less than 0.1%, there is a risk that the thickness upon application and the moist feeling will not be sustained. If the (C) component is more than 15%, the viscosity of the skin cosmetic will increase, which may result in poor compatibility and spreadability on the skin, and stickiness.

The present invention contains (D) a higher alcohol having 12 to 24 carbon atoms from the viewpoints of thickness and non-stickiness when applied.

The component (D) used in the present invention is not particularly limited, but examples thereof include lauryl alcohol, myristyl alcohol, cetanol, stearyl alcohol, arachyl alcohol, behenyl alcohol, and 2-decyltetradecanol. The component (D) may contain one or more types.

Among the components (D) used in the present invention, myristyl alcohol, cetanol, stearyl alcohol, and behenyl alcohol are preferred from the viewpoint of non-stickiness, and myristyl alcohol is particularly preferred.

The content of the (D) component used in the present invention is preferably 0.05 to 4%, more preferably 0.1 to 2%, and even more preferably 0.3 to 1%. If the (D) component is less than 0.05%, there is a risk that the desired thickness may not be achieved upon application, or that stickiness may occur. If the (D) component is more than 4%, the skin cosmetic may become hard, resulting in poor compatibility and spreadability on the skin, or stickiness.

From the viewpoint of ease of removal from fingers, the viscosity of the skin cosmetic of the present invention is preferably 2,000 to 40,000 mPa·s at 20°C. If the viscosity is less than 2,000 mPa·s, the skin cosmetic may be prone to dripping, resulting in poor removal from fingers. If the viscosity exceeds 40,000 mPa·s, the skin cosmetic may become hard, resulting in poor removal from fingers.

The viscosity of the skin cosmetic of the present invention at 20°C was measured by filling a 140g sample bottle (Food 140: manufactured by Daiichi Glass Co., Ltd.) with 120g of the skin cosmetic prepared by conventional methods, leaving it at 20°C for one day to adjust the temperature, and then measuring the viscosity at 20°C for one minute using a No. 4 rotor at a rotation speed of 12 rpm using a B-type viscometer with a helical stand (Model: Digital Viscometer TVB-10M, manufactured by Toki Sangyo Co., Ltd.).

From the viewpoint of emulsion stability, the pH of the skin cosmetic of the present invention is preferably 4 to 9 at 20°C. If the pH of the skin cosmetic is less than 4 or exceeds 9, the emulsion stability may be deteriorated.

In the present invention, emulsion stability refers to whether or not the skin cosmetic is separated when 120 g of the skin cosmetic is placed in a 140 g sample bottle (Food 140: manufactured by Daiichi Glass Co., Ltd.) and stored in a constant temperature bath at 40°C for 30 days and removed from the constant temperature bath.

The pH of the skin cosmetic of the present invention at 20°C was measured using a glass electrode type hydrogen ion concentration indicator (F-71, manufactured by Horiba, Ltd.) after the skin cosmetic prepared by a conventional method was left to stand at 20°C for one day and the temperature was adjusted.

In addition to the essential components, the skin cosmetic of the present invention may contain at least one selected from various components used in ordinary cosmetics, quasi-drugs, pharmaceuticals, etc., such as surfactants, oily components, moisturizers other than component (C), chelating agents, medicinal ingredients, protein derivatives, hydrolyzed proteins, stabilizers, antioxidants, plant extracts, herbal extracts, vitamins, preservatives, dyes, pigments, powders, UV absorbers, fragrances, etc., to the extent that the effects are not impaired. However, the components are not limited to these examples.

The present invention will be described in more detail below with reference to examples, but these are not intended to limit the present invention in any way.

The evaluation tests shown in this specification were carried out while varying the ingredients contained in the skin cosmetics and their contents.

In the evaluation test methods shown in this specification, "thickness when applied," "compatibility with the skin," "ease of spreading," "non-stickiness," and "lasting moist feeling" were evaluated using the following methods.

"Thickness when applied"
A panel of 15 experts evaluated the thickness of the skin cosmetics obtained in the Examples and Comparative Examples when applied. In the evaluation test, 1 g of the skin cosmetics of the Examples and Comparative Examples, which had been adjusted to 20° C., was applied evenly to the entire face under conditions of room temperature of 20° C. and humidity of 60%, and the thickness when applied was evaluated by sensory evaluation.
<Evaluation criteria>
5: 13 or more out of 15 people felt that the product was thick when applied.
4: Between 10 and 12 out of 15 people felt that the coating was too thick when applied.
3: 7 to 9 out of 15 people felt that the coating was thick when applied.
2: Of 15 people, between 4 and 6 felt that the coating was too thick when applied.
1: 3 or less out of 15 people felt that the product was too thick when applied.

"Skin-friendly"
A panel of 15 experts evaluated the compatibility of the skin cosmetics obtained in the Examples and Comparative Examples with the skin. In the evaluation test, 1 g of the skin cosmetics of the Examples and Comparative Examples, adjusted to 20° C., was applied evenly to the entire face under conditions of room temperature of 20° C. and humidity of 60%, and the compatibility of the cosmetics with the skin upon application was evaluated by sensory evaluation.
<Evaluation criteria>
5: More than 13 out of 15 people felt that the product blended well with the skin.
4: Between 10 and 12 out of 15 people felt that the product blended well with the skin.
3: Between 7 and 9 out of 15 people felt that the product blended well with their skin.
2: Between 4 and 6 out of 15 people felt that the product blended well with the skin.
1: Less than 3 out of 15 people felt that the product blended well with the skin.

"Good stretchiness"
A panel of 15 experts evaluated the spreadability of the skin cosmetics obtained in the Examples and Comparative Examples. In the evaluation test, 1 g of the skin cosmetics of the Examples and Comparative Examples, which had been adjusted to 20° C., was applied evenly to the entire face under conditions of room temperature of 20° C. and humidity of 60%, and the spreadability upon application was evaluated by sensory evaluation.
<Evaluation criteria>
5: More than 13 out of 15 people felt that it stretched well.
4: Of 15 people, between 10 and 12 felt that the stretch was good.
3: Of the 15 people, between 7 and 9 felt that the stretch was good.
2: Of the 15 people, between 4 and 6 felt that the stretch was good.
1: Fewer than 3 out of 15 people felt that the stretch was good.

"Non-sticky"
The stickiness of the skin cosmetics obtained in the Examples and Comparative Examples was evaluated by a panel of 15 experts. In the evaluation test, 1 g of the skin cosmetics of the Examples and Comparative Examples, which had been adjusted to 20° C., was applied evenly to the entire face under conditions of room temperature of 20° C. and humidity of 60%, and the skin cosmetics were evaluated by sensory evaluation as to whether or not they felt sticky.
<Evaluation criteria>
5: 13 or more out of 15 people did not feel sticky.
4: Between 10 and 12 out of 15 people did not feel sticky.
3: Between 7 and 9 out of 15 people did not feel sticky.
2: Between 4 and 6 out of 15 people did not feel sticky.
1: Less than 3 out of 15 people did not feel sticky.

"Sustained moisturizing effect"
The moisturizing effect of the skin cosmetics obtained in the Examples and Comparative Examples was evaluated by a panel of 15 experts. The evaluation test consisted of applying 1 g of the skin cosmetics of the Examples and Comparative Examples, which had been adjusted to 20° C., evenly over the entire face under conditions of room temperature of 20° C. and humidity of 60%, and leaving the skin unattended for 6 hours, after which the panelists evaluated whether or not the skin felt moisturized.
<Evaluation criteria>
5: More than 13 out of 15 people felt that the moist feeling lasted.
4: Between 10 and 12 out of 15 people felt that the moist feeling lasted.
3: Between 7 and 9 out of 15 people felt that the moist feeling lasted.
2: Between 4 and 6 out of 15 people felt that the moist feeling lasted.
1: Less than 3 out of 15 people felt that the moist feeling lasted.

Examples 1 to 39 shown in Tables 1 to 5 showed good results in terms of thickness when applied, compatibility with the skin, ease of spreading, lack of stickiness, and sustained moisturizing sensation.

Example 40 of the skin cosmetic is described below.

The skin cosmetics obtained in the following examples showed good results in terms of thickness when applied, compatibility with the skin, spreadability, non-stickiness, and sustained moisturizing effect.

<Example 40>
Component Content (mass%)
(A) (Acryloyldimethyltaurate ammonium/VP) copolymer 0.10
(B) (ammonium acryloyldimethyltaurate /
Beheneth-25) methacrylate crosspolymer 0.10
(B) (Acrylates/Alkyl Acrylates (C10-30))
Crosspolymer 0.20
(C) Methyl gluceth-10 2.00
(D) Myristyl alcohol 0.50
Octyldodecyl myristate 4.00
Squalane 1.00
Sorbitan monostearate 0.20
Methylpolysiloxane 2.00
Disodium edetate 0.05
Trimethylglycine 2.00
1,3-butylene glycol 10.00
Methyl parahydroxybenzoate 0.30
Concentrated glycerin 3.00
Dipropylene glycol 7.00
Bergamot fruit oil 0.01
Rosemary oil 0.01
L-Arginine 0.20
Bilberry Leaf Extract 0.01
Peppermint extract 0.01
Chamomilla Extract (1) 0.01
Rosemary extract 0.01
Saxifrage extract 0.01
Hawthorn extract 0.01
Arnica extract 0.01
Ethanol 0.01
Fragrance 0.40
Purified water 66.85
Total 100.00

The present invention makes it possible to obtain a skin cosmetic that is thick when applied, spreads well on the skin, is not sticky, and provides a long-lasting moist feeling.

Claims (2)

(A) Ammonium acryloyldimethyltaurate/VP copolymer (B) Ammonium acryloyldimethyltaurate/beheneth-25 methacrylate crosspolymer and acrylates/C10-30 alkyl acrylate crosspolymer
A skin cosmetic comprising (C) an alkyl glucoside derivative and (D) a higher alcohol having 12 to 24 carbon atoms , the content of the component (A) being 0.01 to 1 mass%, the content of the component (B) being 0.01 to 1 mass%, the content of the component (C) being 0.1 to 15 mass%, and the content of the component (D) being 0.05 to 4 mass% . 2. The skin cosmetic preparation according to claim 1 , wherein the component (C) is one or more selected from methyl gluceth-10, methyl gluceth-20, PPG-10 methyl glucose, and PPG-20 methyl glucose.