Emulsion composition

Abstract

To provide an emulsion composition that contains nicotinamide, has a great effect of giving the skin resilience and elasticity, has a good feeling of use with no stickiness, and has excellent emulsion stability.SOLUTION: An emulsion composition contains following components: (A) nicotinamide, (B) clay mineral or organic modified product thereof, (C) water-soluble polymer, (D) phospholipid, (E) higher alcohol or alkyl glyceryl ether, (F) oil-based component excluding (E) component, and (G) water.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention provides an emulsion composition which contains nicotinamide, has an excellent effect of imparting firmness and elasticity to the skin, has an excellent non-sticky feel when used, and has excellent emulsion stability. [Background technology]

[0002] Factors that greatly affect the aesthetic appearance of the skin include wrinkles, sagging, age spots, pigmentation, etc. Many drugs have been proposed to prevent and improve wrinkles and sagging, and among them, nicotinamide, a vitamin, is known to be highly safe and to have an anti-aging effect on the skin (Patent Documents 1 and 2). However, it is known that products containing a large amount of nicotinamide have undesirable textures when used, such as stickiness (Patent Document 3).

[0003] Furthermore, unlike pharmaceuticals, the sensory aspects and stability are important factors in cosmetics.

[0004] For this reason, various investigations have been carried out, but no emulsion containing nicotinamide, having good stability and being satisfactory in terms of sensory aspects has been obtained. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 10-130135 [Patent Document 2] Japanese Patent Application Publication No. 10-001414 [Patent Document 3] Special Publication No. 2003-502435 DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0006] An object of the present invention is to provide an emulsion composition which contains nicotinamide, prevents wrinkles and sagging of the skin, has an excellent effect of imparting firmness and elasticity, has an excellent non-sticky feel when used, and has excellent emulsion stability. [Means for solving the problem]

[0007] As a result of intensive research, the inventors have found that when nicotinamide is formulated at a high concentration, an emulsion composition having an excellent feel when used and excellent emulsion stability can be obtained by simultaneously containing a clay mineral or an organically modified product thereof, a water-soluble polymer, a phospholipid, and a higher alcohol or an alkyl glyceryl ether.

[0008] That is, the present invention provides the following components (A) to (G): (A) Nicotinamide (B) Clay minerals or their organic modifications (C) Water-soluble polymer (D) Phospholipids (E) Higher alcohol or alkyl glyceryl ether (F) Oil-based components excluding (E) (G)Water The emulsion composition comprises:

[0009] In the present invention, the component (C) is one or more selected from the group consisting of carboxyvinyl polymers, polysaccharides or derivatives thereof, and polyethylene glycol.

[0010] In the present invention, the component (D) is one or more selected from the group consisting of hydrogenated phospholipids, hydroxylated phospholipids, and hydrogenated lysophospholipids.

[0011] In the present invention, the content mass ratio (A) / (B) of the component (A) to the component (B) in the composition is preferably 0.5-100, and more preferably 1-50. Effect of the Invention

[0012] According to the present invention, it is possible to provide an emulsion composition which has an excellent effect of imparting firmness and elasticity to the skin, has an excellent non-sticky feel when used, and has excellent emulsion stability. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present invention will be described in detail below. In this specification, the symbol "to" means a range including the numerical values ​​before and after it. Furthermore, numerical values ​​expressed as % are values ​​based on mass unless otherwise specified.

[0014] <1> Component (A): Nicotinamide The component (A) in the present invention is an amide compound of nicotinic acid (vitamin B3 / niacin). Nicotinamide is a water-soluble vitamin and a known substance that is one of the vitamin B group. It can be extracted from natural products (such as rice bran) or synthesized by known methods. Specifically, those listed in the Japanese Pharmacopoeia can be used.

[0015] In the present invention, the content of component (A) in the emulsion composition is 1 to 10% by mass (hereinafter, simply "% by mass" will be abbreviated as "%"), preferably 3 to 10%, and more preferably 4 to 7%, in order to improve the firmness and elasticity of the skin and suppress stickiness. If the content of component (A) is less than 1%, the effect of imparting firmness and elasticity to the skin is not excellent, and if it exceeds 10%, the stickiness during use is excessive and the feeling of use is poor.

[0016] <2> Component (B): Clay minerals or their organically modified substances The clay mineral (B) in the present invention is a mineral that constitutes clay, and its main component is a layered silicate mineral (phyllosilicate mineral). Examples include montmorillonite, saponite, hectorite, bentonite, and smectite, and an example of the chemical name is magnesium aluminum silicate. Sheets formed by linking metal ions (aluminum, sodium, calcium, etc.) and silicic acid are formed in layers.

[0017] That is, the clay minerals that can be used in the present invention are known ones such as hectorite, montmorillonite, saponite, hectorite, bentonite, smectite, etc., and in addition to these, they also include organically modified products in which the convertible cations intervening between the crystal layers are replaced with organic polar compounds or organic cations. As a treatment method, a method in which an organic cation is dissolved or dispersed in an appropriate solvent, a clay mineral is immersed therein, filtered, and the filtrate is dried to prepare an organically modified clay mineral is preferable. As a drying method, a method of drying using a kneader, a method of drying using a spray dryer, a method of freeze drying, etc. are mentioned. As a drying method, a method of drying using a kneader is preferable from the viewpoint of cost.

[0018] The organic cation used to modify the clay mineral may be one or more selected from ammonium compounds such as alkyl ammonium chlorides, and among these, dimethyl distearyl ammonium chloride is preferred.

[0019] The content of this component (B) in the emulsion composition is preferably 0.1 to 5.0%, and more preferably 0.3 to 2.0%.

[0020] <3> Component (C): Water-soluble polymer Component (C) in the present invention is a general term for polymers that provide a thickening effect when made into an aqueous solution and the pH is adjusted as necessary, and examples of such polymers include carboxyvinyl polymers, polysaccharides and their derivatives, and polyethylene glycol.

[0021] That is, the water-soluble polymer that can be used in the present invention is one or more selected from carboxyvinyl polymers, polysaccharides or derivatives thereof, and polyethylene glycol, and preferably one or more selected from polysaccharides or derivatives thereof, and polyethylene glycol.

[0022] The content of this water-soluble polymer varies greatly depending on the type of water-soluble polymer, the types and amounts of other ingredients, and the pH of the emulsion composition, but is preferably 0.01 to 10% by weight, and more preferably 0.05 to 8% by weight in the emulsion composition.

[0023] <4> Component (D): Phospholipids In the present invention, unless otherwise specified, component (D) refers to a structure in which fatty acids and phosphoric acid are bound to a central skeleton of glycerin or sphingosine, and further, alcohol is ester-bound to the phosphoric acid. Examples of fatty acids constituting phospholipids include saturated and unsaturated carboxylic acids having 7 to 22 carbon atoms. Alcohols constituting phospholipids often contain nitrogen, and examples of such alcohols include choline, ethanolamine, inositol, serine, etc.

[0024] In the present invention, soybean lecithin extracted from natural soybeans or egg yolks, and hydrogenated lecithin (hydrogenated lecithin) obtained by hydrogenating these, hydrogenated soybean lecithin, hydrogenated egg yolk lecithin, synthetic phospholipids, and other phospholipids generally known as phospholipids can be used. More specifically, phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, phosphatidic acid, phosphatidylinositol, and the like can be preferably used. Among these, one or more kinds can be used.

[0025] Specifically, examples of the phospholipid include hydrogenated soybean phospholipid, hydrogenated egg yolk phospholipid, hydrogenated phosphatidylcholine, hydrogenated phosphatidylserine, etc., and may be a lysophospholipid in which one fatty acid group has been removed from a phospholipid, or a hydrogenated lysophospholipid obtained by hydrogenating such a phospholipid.

[0026] In the present invention, the content of component (D) in the emulsion composition is preferably 0.2 to 2%, and more preferably 0.2 to 1.5%, from the viewpoints of improving stickiness and emulsion stability.

[0027] <5> Component (E): Higher alcohol or alkyl glyceryl ether The higher alcohol of component (E) in the present invention is a general term for monohydric alcohols having 6 or more carbon atoms. Examples of higher alcohols that can be used in the present invention include decomposed alcohols obtained by hydrolyzing (saponifying) waxes, reduced alcohols obtained by reducing fatty acids with high-pressure hydrogen, and synthetic alcohols made from petroleum resources.

[0028] In the present invention, among monohydric alcohols having 6 or more carbon atoms, linear, saturated ones having 14 to 22 carbon atoms are preferred.

[0029] The alkyl glyceryl ether of component (E) in the present invention is a general term for compounds having an alkyl group, in which an ether bond is formed between a hydroxyl group of glycerol and an alcohol.

[0030] The alkyl glyceryl ether of the present invention may be any one of monoalkyl glyceryl ether, dialkyl glyceryl ether, and trialkyl glyceryl ether, or a mixture thereof. Preferred is monoalkyl glyceryl ether, and among these, those having a linear or branched alkyl group and having 14 to 22 carbon atoms in the alkyl group are particularly preferred.

[0031] In the present invention, the content of component (E) in the emulsion composition is preferably 0.5 to 5%, and more preferably 1 to 4%.

[0032] <6> Component (F): Oil-based components excluding component (E) Component (F) in the present invention is an oily component other than component (E), i.e., higher alcohol and alkyl glyceryl ether, and may contain, for example, hydrocarbon oils, ester oils, silicones, higher fatty acids, etc.

[0033] In the present invention, the content of component (F) in the emulsion composition is preferably 3 to 30%, and more preferably 10 to 25%.

[0034] In addition, the emulsion composition contains component (G): water, and selects raw materials as necessary. EXAMPLES

[0035] The present invention will be specifically described below by way of examples, but the present invention is not limited to these examples in any way.

[0036] Table 1 shows the compositions and results of the examples and comparative examples. The manufacturing method was as follows: phase A and phase B were each heated to 80°C, phase B was gradually added to phase A while stirring with a dispersing mixer, and then the mixture was cooled.

[0037] [Table 1]

[0038] Note 1) Kunimine Kogyo Co., Ltd. Sumecton SA Note 2) NOF Corp. PEG#4000 Note 3) Nikko Chemicals NIKKOL Resinol S-10 Note 4) Nikko Chemicals NIKKOL Batyl Alcohol EX Note 5) Behenyl Alcohol 65, by Kokyu Alcohol Kogyosha

[0039] The "emulsion stability" in the table was judged as follows. The formulation was filled into a transparent glass bottle and stored at 40°C and 75% RH for 6 months. The emulsified state was visually confirmed. ○: No changes in state such as separation or aggregation were observed. △: Slight changes in state such as separation or aggregation are observed. ×: A change in state such as separation or aggregation is clearly observed. Moreover, in Comparative Example 1 (marked with *), the desired emulsified state was not obtained immediately after preparation.

[0040] All of Examples 1 to 5 were able to provide emulsion compositions that were excellent in the effect of imparting firmness and elasticity to the skin, had an excellent feel when used with little stickiness, and had excellent emulsion stability.

Claims

1. An emulsion composition comprising the following components, wherein the mass ratio of component (A) to component (B) is 0.5 to 100: (However, the following (1) and (2) are excluded. (1) A sprayable oil-in-water cosmetic composition comprising a water-swellable clay mineral, a natural polymer, an oily component, and a surfactant. (2) A complex consisting of an amphoteric surfactant and / or a semi-polar surfactant and a higher fatty acid, characterized in that the amphoteric surfactant and / or the semi-polar surfactant is one or more selected from those represented by the following general formula: ・General formula (a) an amidobetaine amphoteric surfactant represented by the formula: ・General formula (b) an amidosulfobetaine type amphoteric surfactant represented by the formula: ・General formula (c) A betaine-type amphoteric surfactant represented by the formula: ・General formula (d) A sulfobetaine type amphoteric surfactant represented by the formula: ・General formula (e) an imidazolinium-type amphoteric surfactant represented by the formula: ・General formula (f) A tertiary amine oxide type semi-polar surfactant represented by the formula: In the general formulas (a) to (f), R 1 represents an alkyl or alkenyl group having an average of 9 to 17 carbon atoms, and R 2 represents an alkyl or alkenyl group having an average of 10 to 18 carbon atoms, X is an integer of 2 to 4, Y is an integer of 0 to 3, and Z is an integer of 1 or 2. (A) Nicotinamide 1 to 10% by mass (B) Clay minerals containing magnesium aluminum silicate or organically modified products thereof (C) Water-soluble polymer containing polyethylene glycol (D) Phospholipids (E) A higher alcohol that is a monohydric alcohol having 14 to 22 carbon atoms. (F) An oil component containing pentaerythritol tetra 2-ethylhexanoate, excluding component (E) (G) Water

2. The emulsion composition according to claim 1 , wherein the component (D) is a hydrogenated phospholipid.

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