JP7509401B2 - Oil-based solid cosmetics - Google Patents

Description

The present invention relates to an oil-based solid cosmetic product.

In recent years, with the popularity of hair coloring and perm agents, hair has become more and more damaged, and the demand for repairing hair damage and protecting hair is growing. Damaged hair can be significantly improved by using cosmetics to replenish oil and give it smoothness and flexibility. In particular, oil-based cosmetics such as hair oil and hair balm can be formulated with a large amount of oil, making them excellent at repairing hair damage and protecting hair. In addition, an increasing number of consumers are concerned about skin damage caused by dryness, and the demand for moisturizing and protecting the skin is increasing. Damaged skin can be significantly improved by using cosmetics to replenish oil on the skin, prevent moisture evaporation, and protect it. In particular, oil-based cosmetics such as body oil, body balm, and lip balm can be formulated with a large amount of oil, making them excellent at moisturizing and protecting the skin.

Oil-based cosmetics come in a variety of formulations, including solid, paste, and liquid, but solid cosmetics are attracting attention as hair and skin cosmetics because there is no risk of leakage from the container and they are convenient to carry. In recent years in particular, many multi-purpose types that can be used on both hair and skin have been commercialized, but as most of them are sticky, there is a demand for products that have a refreshing feel.

Since oil-based solid cosmetics are mainly composed of oils, they tend to feel sticky when applied to hair and skin. Therefore, in order to improve the refreshing feeling when used, it is necessary to blend a large amount of liquid oil. However, when oil-based solid cosmetics that blend a large amount of liquid oil are stored under high temperature conditions, there is a problem that the liquid oil appears as oil droplets on the surface of the oil-based solid cosmetics. To solve the above problem, oil-based solid cosmetics using 12-hydroxystearic acid have been reported (Patent Document 1). However, as in Patent Document 1, oil-based solid cosmetics using 12-hydroxystearic acid are less sticky on hair and skin and have excellent stability when stored under high temperature conditions (hereinafter referred to as "high temperature stability"), but there is a problem that cracks occur when stored under high temperature conditions. As an oil-based solid cosmetic that solves the above problem, an oil-based solid cosmetic using polyethylene terephthalate powder has been reported (Patent Document 2).

Japanese Patent Application Laid-Open No. 5-238915 JP 2012-72104 A

However, as in Patent Document 2, oil-based solid cosmetics using polyethylene terephthalate powder can suppress cracking when stored under high-temperature conditions, but when the oil-based solid cosmetic is filled into a jar and solidifies during the cooling process, there is a problem in that cracks occur on the surface of the oil-based solid cosmetic due to shrinkage. In addition, the oil-based solid cosmetic is not easily removable with fingers when removed from the jar, so that currently no oil-based solid cosmetic has been obtained that is satisfactory in terms of the absence of surface cracks, high-temperature stability, ease of removal, and lack of stickiness on hair and skin.

As a result of extensive research into how to solve the above problems, the present inventors discovered that an oil-based solid cosmetic containing 50% by mass or more of an ester oil that is liquid at 25°C, and characterized in that it contains (A) a polyglycerol fatty acid ester, and (B) one or more selected from waxes having a melting point of 60°C or higher and hydrogenated vegetable oils, can solve the above problems, leading to the completion of the present invention.

The present invention can provide an oil-based solid cosmetic product that is free of surface cracks, has excellent high-temperature stability and is easy to remove, and is not sticky on hair or skin.

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

In the present invention, "cracking" refers to the appearance of cracks or gaps on the surface due to the shrinkage of an oil-based solid cosmetic when it is filled into a container and cooled to solidify.

In the present invention, "ease of removal" refers to an oil-based solid cosmetic product that is neither too soft nor too hard and can be removed smoothly when scooped with fingers.

The oil-based solid cosmetic product according to the present invention contains 50% or more of an ester oil that is liquid at 25°C, from the viewpoint of non-stickiness on hair and skin.

The ester oil that is liquid at 25°C used in the present invention is not particularly limited, but examples thereof include tri(caprylic/capric acid)glyceryl, methylheptyl laurate, methylheptyl myristate, methylheptyl palmitate, methylheptyl isostearate, isocetyl myristate, octyldodecyl myristate, isocetyl stearate, ethylhexyl isononanoate, isononyl isononanoate, isodecyl isononanoate, isopropyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, isopropyl isostearate, cetyl ethylhexanoate, glyceryl triisostearate, glyceryl triethylhexanoate, neopentyl glycol dicaprate, neopentyl glycol diisononanoate, neopentyl glycol diethylhexanoate, propylene glycol dicaprate, propylene glycol dicaprylate, etc., and one or more of these may be contained. Of these, tri(caprylic/capric acid)glyceryl and methylheptyl palmitate are preferred from the viewpoint of non-stickiness of hair and skin.

The oil-based solid cosmetic composition of the present invention contains (A) polyglycerol fatty acid ester from the viewpoints of preventing surface cracking and high-temperature stability.

The fatty acid constituting the component (A) used in the present invention may be, for example, a linear or branched, saturated or unsaturated fatty acid having 12 to 22 carbon atoms. Of these, linear saturated fatty acids having 16 to 18 carbon atoms are preferred from the viewpoint of the absence of surface cracks and high temperature stability, and linear saturated fatty acids having 18 carbon atoms are more preferred.

The average degree of polymerization of the glycerin constituting the component (A) used in the present invention is, for example, glycerin having an average degree of polymerization of 2 to 10. From the viewpoint of the absence of surface cracks and high temperature stability, it is preferable that the average degree of polymerization of glycerin is 6 to 10, and it is more preferable that the average degree of polymerization of glycerin is 10.

The polyglycerol fatty acid ester of component (A) used in the present invention is not particularly limited, but examples thereof include polyglyceryl-10 laurate, polyglyceryl-6 myristate, polyglyceryl-10 myristate, polyglyceryl-2 stearate, polyglyceryl-4 stearate, polyglyceryl-6 stearate, polyglyceryl-10 stearate, polyglyceryl-6 tristearate, polyglyceryl-10 tristearate, polyglyceryl-6 pentastearate, polyglyceryl-10 pentastearate, polyglyceryl-10 decastearate, polyglyceryl-10 isostearate, polyglyceryl-10 pentaisostearate, polyglyceryl-10 oleate, polyglyceryl-10 pentaoleate, polyglyceryl-10 dodecabehenate, etc., and may contain one or more types. Of these, from the viewpoints of the absence of surface cracks and high-temperature stability, polyglyceryl-10 pentastearate, polyglyceryl-10 tristearate, and polyglyceryl-6 stearate are preferred, with polyglyceryl-10 pentastearate being more preferred.

The content of the (A) component used in the present invention is preferably 0.1 to 6%, and more preferably 0.5 to 2%. If the (A) component is less than 0.1%, the surface crack-free property and high-temperature stability may be deteriorated. If the (A) component is more than 6%, the ease of removal may be impaired.

From the viewpoint of high temperature stability, the oil-based solid cosmetic composition according to the present invention contains (B) one or more selected from waxes and hydrogenated vegetable oils having a melting point of 60°C or higher.

The waxes having a melting point of 60°C or higher in the component (B) used in the present invention are not particularly limited, but examples include sunflower seed wax, candelilla wax, rice bran wax, carnauba wax, snow wax, etc., and one or more of these may be included. Of these, sunflower seed wax and candelilla wax are preferred from the viewpoint of high temperature stability, and sunflower seed wax is more preferred. Commercially available products include refined sunflower wax (manufactured by Yokoseki Yushi Kogyo Co., Ltd., melting point 76°C), deodorized refined candelilla wax (manufactured by Cerarica NODA Co., Ltd., melting point 68-72°C), TOWAX-4F3 (manufactured by Toa Kasei Co., Ltd., melting point 68-73°C), etc.

The hydrogenated vegetable oil having a melting point of 60°C or higher as component (B) used in the present invention is not particularly limited, but examples include hydrogenated castor oil, hydrogenated rapeseed oil, hydrogenated soybean oil, hydrogenated jojoba oil, etc., and one or more of these may be included. Of these, hydrogenated castor oil is more preferable from the viewpoint of ease of extraction. An example of a commercially available product is castor hydrogenated oil A (manufactured by Ito Oil Mills, melting point 84-87°C), etc.

The content of the (B) component used in the present invention is preferably 1 to 8%, more preferably 2 to 6%. If the (B) component is less than 1%, the high temperature stability may be poor. If the (B) component is more than 8%, the product may feel sticky or may be difficult to remove.

In addition to the essential components, the oil-based solid cosmetic of the present invention can contain at least one selected from various components used in ordinary cosmetics, quasi-drugs, pharmaceuticals, etc., such as other surfactants, oil-based components other than the components (A) and (B), moisturizers, thickeners, chelating agents, medicinal ingredients, protein derivatives, hydrolyzed proteins, amino acids, stabilizers, antioxidants, plant extracts, herbal extracts, vitamins, preservatives, colorants, pigments, powders, pH adjusters, UV absorbers, fragrances, etc. However, the components are not limited to these examples.

The needle penetration hardness of the oil-based solid cosmetic of the present invention is not particularly limited, but is preferably 10 to 80 g. If the needle penetration hardness is less than 10 g, it may be too soft and difficult to remove. If the needle penetration hardness is more than 80 g, it may be too hard and difficult to remove.

The penetration hardness in this invention is determined by dissolving an oil-based solid cosmetic product prepared by a conventional method, filling 40 g into a glass container (Chamaru 50: manufactured by Asai Glass Co., Ltd.), leaving it to stand at 20°C for 24 hours, and then penetrating 32 mm into the container at a speed of 1 mm/sec using a creep meter (model: Leonar RE-3305S, manufactured by Yamaden Co., Ltd.) with a 2 mm diameter jig, and measuring the average resistance load at 10 mm, 20 mm, and 30 mm.

The oil-based solid cosmetic of the present invention can be used as a leave-in hair cosmetic and a skin cosmetic.

The container into which the oil-based solid cosmetic of the present invention is filled is not particularly limited, but it is preferable to fill it into a jar-type container. The material of the container is not particularly limited, but aluminum containers, glass containers, PP containers, PE containers, PET containers, etc. are preferable. The filled oil-based solid cosmetic can be directly scooped up with the fingers and used on hair or skin as is or after spreading it on the hands.

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

In the evaluation tests shown in this specification, the components contained in the oil-based solid cosmetic product and the results of various experiments carried out while changing their contents are shown below. Note that the units showing the contents of each component in the oil-based solid cosmetic product are all mass %, and these were prepared by conventional methods.

In the evaluation tests shown in this specification, the product was evaluated for "absence of surface cracking," "high temperature stability," "ease of removal," "absence of stickiness on hair," and "absence of stickiness on skin."

[Absence of surface cracks]
40 g of the obtained oil-based solid cosmetic was filled into a glass container (Chamaru 50: manufactured by Asai Glass Co., Ltd.) and allowed to stand at 25° C. for 24 hours. The appearance was then visually observed and evaluated for the presence or absence of cracks on the surface of the oil-based solid cosmetic.

(Judgment criteria)
○: No cracks △: Slight cracks ×: Large cracks

[High temperature stability]
40 g of the obtained oil-based solid cosmetic was filled into a glass container (Chamaru 50: manufactured by Asai Glass Co., Ltd.), and left to stand at 25° C. for 24 hours, and then at 50° C. for one month, after which the presence or absence of oil droplets on the surface was evaluated. At this time, an incubator with a refrigerator (model: MIR-554-PJ, manufactured by Panasonic Healthcare Co., Ltd.) was used.

(Judgment criteria)
○: No oil droplets △: A few oil droplets ×: A large amount of oil droplets

[Ease of removal]
40 g of the obtained oil-based solid cosmetic was filled into a glass container (Chamaru 50: manufactured by Asai Glass Co., Ltd.) and allowed to stand at 25° C. for 24 hours. After that, a sensory evaluation was performed on the ease of removal, taking into account the overall softness, hardness, and smoothness when the cosmetic was scooped up with an index finger.

(Evaluation method)
Ten panelists used oil-based solid cosmetics and performed a sensory evaluation for each item. Each panelist rated each item on a five-point scale of 5 points (very good), 4 points (better), 3 points (good), 2 points (bad), and 1 point (very bad), and then calculated the average score of all panelists, and judged the results according to the following criteria.

(Average score criteria)
4.0 points or more: 5
3.5 points or more and less than 4.0 points: 4
3.0 points or more and less than 3.5 points: 3
2.0 points or more and less than 3.0 points: 2
Less than 2.0 points: 1

[Non-sticky hair]
40 g of the obtained oil-based solid cosmetic was filled into a glass container (Chamaru 50: manufactured by Asai Glass Co., Ltd.) and allowed to stand at 25° C. for 24 hours. After that, 0.3 g was divided into three portions and spread on the hands, and then applied to the hair of a hair test doll ("Cut Mannequin No. 775N" manufactured by Beaulax Co., Ltd.), and the non-stickiness of the hair was sensorily evaluated.
(Evaluation method)
Ten panelists used oil-based solid cosmetics and conducted a sensory evaluation of "non-stickiness of hair." Each panelist rated each item on a five-point scale of 5 points (very good), 4 points (better), 3 points (good), 2 points (bad), and 1 point (very bad), and then calculated the average score of all panelists, and judged the results according to the following criteria.

(Average score criteria)
4.0 points or more: 5
3.5 points or more and less than 4.0 points: 4
3.0 points or more and less than 3.5 points: 3
2.0 points or more and less than 3.0 points: 2
Less than 2.0 points: 1

[Non-sticky skin]
The obtained oil-based solid cosmetic was filled in a glass container (Chamaru 50: manufactured by Asai Glass Co., Ltd.) at 40 g and allowed to stand at 25° C. for 24 hours. After that, 0.05 g was taken and evenly spread on both hands, and a sensory evaluation was performed on the non-stickiness of the skin.

(Evaluation method)
Ten panelists used oil-based solid cosmetics and conducted a sensory evaluation of "non-stickiness on the skin." Each panelist rated the products on a five-point scale of 5 points (very good), 4 points (better), 3 points (good), 2 points (bad), and 1 point (very bad), and then calculated the average score of all panelists, which was then judged according to the following criteria.

(Average score criteria)
4.0 points or more: 5
3.5 points or more and less than 4.0 points: 4
3.0 points or more and less than 3.5 points: 3
2.0 points or more and less than 3.0 points: 2
Less than 2.0 points: 1

*1: Refined sunflower wax (manufactured by Yokoseki Oil Industries, melting point 76°C)

*2: Deodorized refined candelilla wax (manufactured by Cerarica NODA, melting point 68-72°C)
*3: Castor hardened oil A (manufactured by Ito Oil Co., Ltd., melting point 84-87°C)
*4: Mokro-100 (Cerarica NODA, melting point 50-53.5°C)

Examples 1 to 24 shown in Tables 1 and 2 showed good results in terms of "absence of surface cracking," "high temperature stability," "ease of removal," "absence of stickiness on hair," and "absence of stickiness on skin."

Example 25 of an oil-based solid cosmetic is described below.

The oil-based solid cosmetic obtained in Example 25 below gave good results in terms of "absence of surface cracking," "high temperature stability," "ease of removal," "absence of stickiness on hair," and "absence of stickiness on skin."

Example 25
Ingredient Content (%)
(A) Polyglyceryl-10 pentastearate 0.7000
(B) Sunflower seed wax 3.8000
(B) Candelilla wax 0.7000
(B) Rice bran wax 0.1600
Dimer dilinoleic acid (phytosteryl/isostearyl/
Cetyl/Stearyl/Behenyl) 24.0000
Caprylic/capric triglyceride 54.3856
Glyceryl tristearate 5.0000
Methylheptyl palmitate 10.0000
Paraffin 0.1400
Tocopherol 0.1000
β-carotene 0.0001
Corn oil 0.1000
Olive oil 0.1000
Shea butter 0.0100
Orange oil 0.0001
Arnica extract (as solids) 0.0001
Cucumber extract (1) (as solids) 0.0001
English: English: English Ivy extract (as solid content) 0.0001
Elderberry extract (as solid content) 0.0001
Malleola extract (as solid content) 0.0001
Parietaria extract (as solid content) 0.0001
Wild thyme extract (as solid content) 0.0001
Dill seed extract (as solids) 0.0001
Cowberry juice (as solids) 0.0001
1,3-butylene glycol 0.0001
Polyoxyethylene alkyl (12-14) ether (3E.O.) 0.0030
Lemon fruit oil 0.0001
Peppermint oil 0.0001
Fragrance 0.8000
Total 100.0000
Penetration hardness: 28g

The present invention has resulted in an oil-based solid cosmetic product that is free of surface cracks, has excellent high-temperature stability and is easy to remove, and is not sticky on hair or skin.

Claims (1)

An oil-based solid cosmetic preparation comprising caprylic/capric triglyceride and methylheptyl palmitate, the total content of said caprylic/capric triglyceride and said methylheptyl palmitate being 50 to 69 % by mass,
1. An oil-based solid cosmetic preparation comprising: (A) one or more selected from polyglyceryl-10 pentastearate, polyglyceryl-10 tristearate, polyglyceryl-6 stearate, polyglyceryl-10 myristate, polyglyceryl-10 dodecabehenate, polyglyceryl-10 oleate, and polyglyceryl-10 isostearate; and (B) one or more selected from sunflower seed wax, candelilla wax, and hydrogenated castor oil, wherein the content of component (A) is 0.1 to 6% by mass, and the content of component (B) is 1 to 8% by mass.