Cleaning agent

Abstract

[Problem] To provide a cleaning agent which has high cleaning power, can be easily washed away, and has an excellent feel on use. [Solution] This cleaning agent comprises (A) an ester of an alkylene glycol or a polyalkylene glycol with pivalic acid, (B) an oil, and (C) an ester of a polyol having a trihydric or higher alcohol skeleton and a carboxylic acid.

Description

Cleansing agent

[0001] The present invention relates to a cleanser, and more particularly to a cleanser that is highly effective in removing keratin plugs formed in pores.

[0002] Makeup cosmetics used in makeup are required to be water-resistant and durable, and products with improved properties have been developed. However, since makeup cosmetics are sometimes not sufficiently cleansed with normal water after use, cleansers such as cleansing oils are often used.

[0003] Such cleansers are required to not only remove makeup but also to have a cleansing effect on dirt on the skin surface and in pores. However, dirt such as sebum, keratin plugs, and dust particles that are contained in pores rather than on the skin surface have a small portion exposed to the skin surface, and among these, keratin plugs have a Baumkuchen-like layered structure of lipids and proteins, making it difficult to completely cleanse them simply with a general cleanser.

[0004] From this perspective, there has been a demand for a cleanser that has a high cleansing effect, causes little damage to the skin, and also has excellent removability and a pleasant feel after cleansing.

[0005] Patent No. 3673924

[0006] According to the present invention, there is provided a cleanser which has a high cleansing effect on cosmetics and the like and a high cleansing effect on keratin plugs, and which also has excellent removability after cleansing and a good feeling when used.

[0007] According to the present invention, the following inventions are provided: [1] A cleanser comprising: (A) an ester of an alkylene glycol or polyalkylene glycol with pivalic acid, (B) an oil, and (C) an ester of a polyol having a trivalent or higher alcohol skeleton with a carboxylic acid. [2] The component (A) is represented by the following formula (1): (wherein AO is propyleneoxy or butyleneoxy, and n is a number from 1 to 20). [3] The cleanser according to [2], wherein AO is propyleneoxy. [4] The cleanser according to any one of [1] to [3], wherein the content of component (A) based on the total mass of the cleanser is 0.5 to 30 mass%. [5] The cleanser according to any one of [1] to [4], wherein component (B) forms an oil phase, and the oil phase is a continuous phase. [6] The cleanser according to any one of [1] to [5], wherein the content of component (B) based on the total mass of the cleanser is 10 to 95 mass%. [7] The cleanser according to any one of [1] to [6], further comprising (D) water. [8] The cleanser according to [7], wherein the content of component (D) based on the total mass of the cleanser is 0 to 50 mass%. [9] The cleanser according to any one of [1] to [8], wherein the HLB of component (C) is 14 or less.

[10] The cleanser according to [9], wherein the content of component (C) is 5 to 35 mass% based on the total mass of the cleanser.

[11] The cleanser according to any one of [1] to

[10] , for removing dirt from pores.

[0008] According to the present invention, a cleanser is provided which has high detergency, can easily cleanse keratin plugs that have been difficult to clean in the past, can be easily washed off from the skin after cleansing, and has an excellent feel when used. Specific Description of the Invention

[0009] [Detergent] The detergent according to the present invention contains, as essential components, (A) an ester of an alkylene glycol or polyalkylene glycol with pivalic acid, (B) an oil, and (C) an ester of a polyol having a trivalent or higher alcohol skeleton with a carboxylic acid. Each component will be described below.

[0010] [(A) Ester of Alkylene Glycol or Polyalkylene Glycol and Pivalic Acid] The cleanser according to the present invention contains an ester of alkylene glycol or polyalkylene glycol and pivalic acid (hereinafter, sometimes referred to as component (A)). In the present invention, component (A) provides excellent cleansing ability against skin dirt, particularly keratin plugs.

[0011] Component (A) is an alkylene glycol or polyalkylene glycol in which pivalic acid is ester-bonded to a terminal hydroxyl group. Although pivalic acid may be bonded to only one of the two terminal hydroxyl groups of the alkylene glycol or polyalkylene glycol, it is preferable that pivalic acid be bonded to both hydroxyl groups.

[0012] The type of alkylene group constituting the alkylene glycol or polyalkylene glycol is not particularly limited, but examples thereof include ethyleneoxy, propyleneoxy, butyleneoxy, etc., and may include combinations thereof. Among these, alkylene glycols or polyalkylene glycols containing propyleneoxy or butyleneoxy as a constituent unit are preferred.

[0013] Specific examples of such component (A) include those represented by the following formula (1). (wherein AO is propyleneoxy or butyleneoxy, and n is a number from 1 to 20)

[0014] Furthermore, in formula (1), AO is preferably propyleneoxy. Furthermore, n is preferably 1 to 10, and more preferably 2 to 5. In particular, it is preferable that component (A) is PPG-3 dipivalate.

[0015] Although the content of component (A) is not particularly limited, the content of component (A) based on the total mass of the cleanser is preferably 0.5 to 30 mass%, and more preferably 1 to 15 mass%. By setting the content of component (A) within this range, excellent cleansing effects can be achieved.

[0016] Note that, depending on the type of AO and the number n, component (A) may be considered as an oil. However, in the present invention, anything that falls under component (A) is excluded from the oil (component (B)) described below.

[0017] [(B) Oil] The cleansing agent according to the present invention contains an oil (hereinafter, sometimes referred to as component (B)). The oil used in the present invention is not particularly limited as long as it is compatible with cosmetics applied to the skin and dirt adhering to the skin, and is harmless to the human body.

[0018] Component (B) can be broadly divided into polar oils and non-polar oils, either of which can be used in the present invention.

[0019] Examples of polar oils include ester oils, higher fatty acids, and higher aliphatic alcohols.

[0020] Examples of ester oils include octyl octanoate, nonyl nonanoate, cetyl octanoate, isopropyl myristate, octyldodecyl myristate, isopropyl palmitate, ethylhexyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, cetyl 2 -ethylhexanoate-2-ethylhexyl palmitate, castor oil fatty acid methyl ester, oleyl oleate, acetoglyceride, 2-heptylundecyl palmitate, diisobutyl adipate, di(phytosteryl / octyldodecyl) lauroyl glutamate, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, triethyl citrate, cetyl ethylhexanoate, macadamia nut fatty acid phytosteryl, tocopheryl acetate, and the like.

[0021] Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, undecylenic acid, tall acid, isostearic acid, linoleic acid, linolenic acid, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA).

[0022] Examples of higher alcohols include straight-chain alcohols (e.g., lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, etc.), branched-chain alcohols (e.g., lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, octyldodecanol, etc.), and the like.

[0023] Examples of non-polar oils include hydrocarbon oils and silicone oils.

[0024] Examples of hydrocarbon oils include paraffin, squalane, squalene, isohexadecane, isododecane, hydrogenated polydecene, hydrogenated isopolybutene, and petrolatum.

[0025] Examples of silicone oils include chain silicone oils such as dimethicone, methylphenylpolysiloxane, caprylyl methicone, diphenylsiloxyphenyltrimethicone, methylhydrogenpolysiloxane, and trimethylsiloxysilicate, and cyclic silicone oils such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane.

[0026] In the present invention, the content of component (B) is preferably 10 to 95% by mass, based on the total mass of the cleanser. When the cleanser according to the present invention is a cleansing oil, the content of component (B) is generally high, and is more preferably 50 to 95% by mass, based on the total mass of the cleanser. Furthermore, when the cleanser according to the present invention has a bicontinuous phase, the content of component (B) is preferably 1 to 30% by mass, based on the total mass of the cleanser. By containing component (B) at such a content, the cleanser according to the present invention can exhibit high detergency. Incidentally, having a bicontinuous phase refers to a state in which both water and oil form continuous phases in the cleanser composition.

[0027] The component (B) used in the present invention may be either a polar oil or a non-polar oil, or a mixture thereof. The polar oil is preferably an ester oil, and the non-polar oil is preferably a hydrocarbon oil.

[0028] [(C) Ester of a Polyol Having a Trihydric or Higher Alcohol Skeleton and a Carboxylic Acid] The cleanser according to the present invention contains an ester of a polyol having a trihydric or higher alcohol skeleton and a carboxylic acid (hereinafter, sometimes referred to as component (C)). In the present invention, by combining component (C) with component (A), the cleansing ability is significantly improved.

[0029] Preferred examples of polyols having a trivalent or higher alcohol skeleton include glycerin, sorbitol, erythritol, etc. The polyol preferably does not contain a nitrogen-containing substituent such as an amino group or a sulfur-containing substituent such as a sulfo group.

[0030] The carboxylic acid preferably has 8 or more carbon atoms, and more preferably 10 or more carbon atoms. Use of a carboxylic acid with a relatively large number of carbon atoms increases lipophilicity and improves compatibility with component (B). Note that component (C) may include compounds that are considered to be oils if they contain a long-chain alkyl group in their structure, but in the present invention, compounds that fall under the category of component (C) are excluded from the definition of oil (component (B)).

[0031] The ester of the polyol and carboxylic acid may be a monoester, diester, triester, tetraester, etc., but a triester or tetraester is preferred. An ester containing an unreacted hydroxyl group may also be used. Furthermore, a polyol having a trivalent or higher alcohol skeleton may contain a polyalkyleneoxy structure. That is,

[0032] Specific examples of such component (C) include polyglyceryl-10 dioleate, PEG-20 glyceryl triisostearate, polyoxyethylene sorbitol tetraisostearate, polyglyceryl-10 pentastearate, polyglyceryl-6 dicaprate, PEG-8 glyceryl isostearate, and PEG-7 glyceryl coconut oil fatty acid.

[0033] Since such component (C) has a hydrophilic portion and a hydrophobic portion, it also functions as a surfactant.

[0034] In the present invention, the HLB of component (C) is not particularly limited, but is preferably 14 or less, and more preferably 10 to 13. The HLB here is determined by the Griffin method.

[0035] In the present invention, the content of component (C) is not particularly limited, but the content of component (C) is preferably 5 to 35 mass%, more preferably 5 to 20 mass%, based on the total mass of the cleanser. Furthermore, when the cleanser according to the present invention has a bicontinuous phase, the content of component (C) is preferably 20 to 35 mass%, based on the total mass of the cleanser.

[0036] [(D) Water] The cleanser according to the present invention may contain water (hereinafter sometimes referred to as component (D)). The water used in cosmetics, quasi-drugs, etc. may be used, such as purified water, ion-exchanged water, tap water, etc. The cleanser according to the present invention is an oily composition containing a high content of oil, but may also contain a small amount of water.

[0037] The content of component (D) is preferably 0 to 50% by mass, relative to the total mass of the cleanser according to the present invention. Furthermore, when the cleanser according to the present invention is a cleansing oil, the content of component (D) is generally low in order to increase the oil content. Specifically, the content of component (D) is preferably 0 to 4% by mass, relative to the total mass of the cleanser. On the other hand, the water content can be increased to make the cleanser according to the present invention a water-in-oil composition. Such compositions can be prepared by applying various emulsification techniques, and the water content can be increased to 90% by mass or more. However, in the cleanser according to the present invention, excellent cleansing properties and a pleasant usability can be achieved by keeping the water content at 0 to 50% by mass, relative to the total mass of the cleanser. When the cleanser according to the present invention has a bicontinuous phase, the content of component (D) is preferably 20 to 50% by mass, relative to the total mass of the cleanser.

[0038] [Other Components] In addition to the above-mentioned components, the cleanser of the present invention may contain other optional components depending on the purpose, provided that the effects of the present invention are not impaired. Such optional components include components commonly incorporated into cleansers, such as stabilizers (e.g., thickeners, preservatives, antioxidants, chelating agents, pH adjusters), surfactants other than component (C), drugs (e.g., vitamin C, vitamin E, amino acids, herbal medicines, anti-inflammatory agents, disinfectants, etc.), clumping agents, ultraviolet absorbers, colorants, fragrances, or protein derivatives.

[0039] The cleanser according to the present invention is used for cleansing, and is particularly suitable for use as a cleansing oil for washing away cosmetics and the like that have been applied to the skin.

[0040] The present invention will be described in detail based on the following examples, but the present invention is not limited to these examples. Unless otherwise specified, the content is expressed as % by mass relative to the total mass.

[0041] [Examples 1 to 5 and Comparative Examples 1 to 3] Compositions for each example were prepared according to the formulations shown in Table 1. These compositions were evaluated for keratinocyte dissolving ability, removability after washing, and usability according to the following criteria. The results obtained are also shown in Table 1. Example 5 shows a case where the composition has a bicontinuous phase.

[0042] Keratin plug solubility: (1) Artificial keratin plugs were prepared, consisting of the following components: Palmitic acid 3.6%, Stearic acid 18.9%, Oleic acid 11.7%, Lauroyl glutamic acid di(phytosteryl / octyldodecyl) 19.8%, Squalene 27.1%, Macadamia nut oil 14.4%, Phytosterol 4.5%. (2) The prepared artificial keratin plugs were dyed red and applied to white suppositories using a doctor blade. (3) 30 g of each composition was placed in a 50 ml screw tube, and the applied suppositories, cut into 2 cm x 2 cm pieces, were placed in the composition. (4) The screw tube was vibrated in a vortex mixer for 1.5 minutes, and the solubility of the keratin plugs was evaluated visually. A: The keratin plugs were completely dissolved. B: A small amount of keratin plugs remained that did not dissolve. C: The keratin plugs were almost completely dissolved. D: The keratin plugs were slightly dissolved. E: The keratin plugs were hardly dissolved.

[0043] Removability after washing: The composition of each example was dropped onto a black resin board, and then running water was poured over it. The removability after washing (speed of washing off) was evaluated based on that of Comparative Example 1. A: Significantly faster than Comparative Example 1 B: Slightly faster than Comparative Example 1 C: Equivalent to Comparative Example 1

[0044] Sensation of use: Each composition was used to wash the face, and the sensation of use was evaluated based on the feeling after use. A: Remarkably more refreshing than Comparative Example 1 B: Slightly more refreshing than Comparative Example 1 C: Equivalent to Comparative Example 1

[0045]

Claims

1. A cleansing agent comprising: (A) an ester of an alkylene glycol or polyalkylene glycol with pivalic acid; (B) an oil; and (C) an ester of a polyol having a trihydric or higher alcohol skeleton with a carboxylic acid.

2. The component (A) is represented by the following formula (1):

2. The cleansing agent according to claim 1, which is represented by the formula: (wherein, AO is propyleneoxy or butyleneoxy, and n is a number from 1 to 20).

3. The cleaning agent according to claim 2, wherein AO is propyleneoxy.

4. A cleansing agent according to claim 1 or 2, wherein the content of component (A) based on the total mass of the cleansing agent is 0.5 to 30 mass %.

5. A cleansing agent according to claim 1 or 2, wherein component (B) forms an oil phase, said oil phase being a continuous phase.

6. The cleansing agent according to claim 1 or 2, wherein the content of component (B) is 10 to 95 mass % based on the total mass of the cleansing agent.

7. A cleansing agent according to claim 1 or 2, further comprising (D) water.

8. The cleansing agent according to claim 7, wherein the content of component (D) is 0 to 50 mass % based on the total mass of the cleansing agent.

9. A cleansing agent according to claim 1 or 2, wherein the HLB of component (C) is 14 or less.

10. The cleansing agent according to claim 9, wherein the content of component (C) is 5 to 35 mass % based on the total mass of the cleansing agent.

11. A cleansing agent as described in 1 or 2 for removing dirt from pores.