JP2012184181A - Pigment dispersion for cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pigment dispersion for cosmetic, obtained by formulating black iron oxide, and improved so that clogging may hardly be caused even when being filled in a pen-shaped container and used.SOLUTION: The pigment dispersion for the aqueous cosmetic is obtained by using a small amount of red ocher in combination with the black iron oxide, and adding an alfa-olefin sulfonic acid salt and sodium sulfate thereto. Preferably, the formulated percentage of the alfa-olefin sulfonic acid salt is 3-5 wt.%, and the formulated ratio of the black iron oxide to the red ocher is from 4:1 to 6:1 in weight. The pigment dispersion for the aqueous cosmetic is suitable as a main agent of an eyeliner used by being filled in the pen-shaped container.

Description

  The present invention relates to a cosmetic pigment dispersion. Specifically, the present invention relates to a pigment dispersion for water-based cosmetics used by filling a pen-type container. A makeup product in which a cosmetic containing the pigment dispersion according to the present invention as a main ingredient is filled in a pen-type container can be suitably used as an eyeliner.

  Conventionally, black iron oxide (triiron tetroxide) is often used as a black colorant in cosmetic pigments. Black iron oxide has no problem in safety and has excellent colorability.

  However, black iron oxide has strong magnetism and high specific gravity, so it has poor dispersibility, and even if it can be dispersed once, it tends to settle and solidify over time. Therefore, when black iron oxide is blended with cosmetics filled in a pen-type container, there is a problem that clogging is likely to occur over time. Various methods have been developed in order to solve this problem.

  For example, Patent Document 1 discloses that the particle diameter of 70% of the iron oxide to be blended is suppressed to 1 to 2 μm or less, and a copolymer of a hydrophobic dissonant monomer and a hydrophilic dissonant monomer and / or a salt thereof and a polysiloxane. There has been proposed a liquid cosmetic which uses a dispersant combined with oxyethylene polyoxypropylene alkyl ether and suppresses the precipitation of iron oxide and improves the stability over time by suppressing the overall viscosity to 200 cps or less. Yes.

  Further, in Patent Document 2, a salt of a higher fatty acid is added as a surface treatment agent for iron oxide, and an alkali metal salt of lauryl sulfate is added as a micellar agent to reduce the overall viscosity to 200 cps or less. Liquid cosmetics that form a stable micelle state and prevent clogging over time have been proposed without limiting the above.

  Furthermore, Patent Document 3 uses black iron oxide that has been hydrophilized, and is mixed with a hydrophilic nonionic surfactant, a polysaccharide, a sequestering agent, and a polymer emulsion to disperse black iron oxide. Liquid pen cosmetics for brush pen type cosmetics that have good properties and excellent usability have been proposed.

  Further, Patent Document 4 contains black iron oxide, an anionic dispersant having an average molecular weight in a specific range and water, and also contains Bengala or yellow iron oxide, and black iron oxide is uniformly dispersed in a fine state. A cosmetic pigment dispersion having excellent stability over time has been proposed.

  Furthermore, Patent Document 5 contains a pigment obtained by oxidizing black iron oxide in a specific temperature range under an atmosphere containing oxygen, and is excellent in water resistance and skin adhesion, and is excellent in makeup. A liner has been proposed.

  The present inventor continued research to make cosmetic pigments containing black iron oxide easier to use, and in the process, tried all of the technologies disclosed above, all showing satisfactory effects. It wasn't. Therefore, the present inventor conducted further research and continued the test focusing on the method of using alpha olefin sulfonate, which is known as a surfactant, together with black iron oxide in combination with Bengala. The invention has been completed.

JP-A-1-193210 Japanese Patent Laid-Open No. 2-088514 Japanese Patent Laid-Open No. 2005-187397 JP-A-2005-330222 JP 2007-217320 A

  The present invention relates to a pigment dispersion for water-based cosmetics that has been improved so as not to cause clogging even when filled with a pen-type container in a cosmetic pigment dispersion containing black iron oxide. It is an object to provide a liquid.

  In order to solve the above-mentioned problems, the invention described in claims and claim 1 is a cosmetic pigment dispersion comprising a combination of black iron oxide and a small amount of Bengala and an alpha olefin sulfonate salt. It is.

  Similarly, the invention described in claim 2 is a cosmetic pigment dispersion obtained by using black iron oxide in combination with a small amount of bengara and adding alpha olefin sulfonate and sodium sulfate.

  Further, the invention described in claim 3 is the cosmetic pigment dispersion according to claim 1 or 2, wherein the blending amount of the alpha olefin sulfonate is 3 to 5% by weight.

  Similarly, the invention described in claim 4 is the cosmetic pigment dispersion according to any one of claims 1 to 3, wherein the mixing ratio of black iron oxide and bengara is 4 to 6 to 1 by weight. .

  Furthermore, the invention described in claim 5 is the cosmetic pigment dispersion according to any one of claims 1 to 4, which is used by being filled in a pen-type container.

  Furthermore, the invention described in claim 6 is the cosmetic pigment dispersion according to claim 5, which is used as an eyeliner.

  According to the present invention, clogging is unlikely to occur even when a cosmetic pigment dispersion containing black iron oxide is used in a pen-type container as a cosmetic main ingredient. Therefore, the cosmetic pigment dispersion according to the present invention can be used very suitably as a main component of an eyeliner.

  The cosmetic pigment dispersion according to the present invention is characterized in that black iron oxide is used in combination with a small amount of bengara and alpha olefin sulfonate is added. Specifically, sodium alpha olefin sulfonate or the like is used as the alpha olefin sulfonate, and the blending amount is preferably 3 to 5% by weight of the total dispersion. The particularly preferred amount of alpha olefin sulfonate is 4% by weight.

  Moreover, in this invention, it is preferable that the compounding ratio of the black iron oxide and Bengala as a pigment shall be 4-6 black iron oxides vs. Bengala 1 by weight ratio. Particularly preferred is a blending ratio of black iron oxide 5 to bengara 1. Furthermore, it is preferable that the blending ratio of the total amount of the pigment containing black iron oxide and bengara is within 30% by weight of the total amount of the dispersion.

  In the cosmetic pigment dispersion according to the present invention, the high specific gravity of black iron oxide does not gel, and the reason why the dispersion state can be maintained well is to adjust the color tone of the pigment by using black iron oxide together with Bengala. This is considered to be because the amount of black iron oxide can be suppressed, and the black iron oxide particles can be maintained hydrophilic by the surface-active action as a dispersant for the alpha olefin sulfonate.

  Alkyl sulfonates, alkyl sulfates, alkyl ether sulfates, and the like have good effects as dispersants for pigments, but considering the feeling of use as cosmetics (texture) and dispersibility, alpha olefin sulfonic acid Salt is optimal. In addition to the sodium alpha olefin sulfonate as the surfactant, the present inventor tried using triethanolamine lauryl sulfate, diethylhexyl sodium succinate, etc., except for sodium alpha olefin sulfonate, The dispersed state could not be maintained.

  Alpha olefin sulfonates are traditionally used as detergents, detergents, inks and hair wash surfactants. There are various types such as sodium alpha olefin sulfonate, potassium alpha olefin sulfonate, and ammonium alpha olefin sulfonate. Any of them can be used in the invention. In particular, the use of sodium alpha olefin sulfonate is preferred.

  Moreover, it is preferable to mix | blend sodium sulfate (especially sodium chondroitin sulfate) in the pigment dispersion liquid for cosmetics which concerns on this invention in order to soften the feel of pigments, such as black iron oxide and a bengara. Sodium sulfate has a protective effect on the cornea of the eye and has excellent moisture retention.

  Furthermore, it is preferable to add oleic acid to the cosmetic pigment dispersion according to the present invention in order to assist dispersibility of pigments such as black iron oxide bengara. Oleic acid is a kind of fatty acid obtained by hydrolysis using natural liquid oil as a raw material, and is usually used in cosmetics because it is usually colorless and has good affinity with the skin. In addition, since oleic acid is easy to be oxidized, care is required for storage.

  The method for producing a pigment dispersion for cosmetics according to the present invention is not particularly different from the conventional method for making a pigment dispersion. All the raw materials may be put into a stirring device such as a homomixer or a ball mill and mixed and stirred. In the case of a small amount, the aqueous raw material may be added little by little to the powder raw material and mixed and stirred so as not to become lumpy.

  In the cosmetic pigment dispersion according to the present invention, a preservative, a humectant, a thickener, a pH adjuster, or the like may be added to the above raw materials. As the preservative, for example, parachlorometaxylenol, isopropylmethylphenol, paraoxybenzoates and the like are suitable.

  Suitable moisturizers include polyethylene glycol, polypropylene glycol, ethylene glycol, maltitol, sorbit and the like.

  Suitable examples of the thickening agent include sodium alginate, xanthan gum, casein, locust bean gum and the like.

  Furthermore, examples of suitable pH adjusting agents include sodium hydroxide, potassium hydroxide, magnesium hydroxide and the like.

  Hereinafter, the present invention will be described in more detail with reference to examples and test examples. In the description of the present invention, “%” indicates all weight percentages.

(1) An example of the formulation of a cosmetic pigment dispersion according to the present invention
Raw material name Mixing ratio (% by weight)
Black iron oxide (powder) 20.00
Sodium sulfate 0.01
Bengala (powder) 5.00
Oleic acid 7.50
Sodium alpha olefin sulfonate 4.00
Water 63.49
Total 100.00

(2) An example of a method for producing a cosmetic pigment dispersion having the above composition A predetermined amount of black iron oxide powder and red rose powder are weighed and mixed. On the other hand, a predetermined amount of oleic acid and sodium alpha olefin sulfonate are emulsified in a predetermined amount of water, sodium sulfate is dissolved in this emulsion, and the solution is added to the mixed powder of black iron oxide and bengara and stirred. Mix.

<< Test Example 1 >>
(1) Purpose of test Confirmation of dispersant having excellent affinity with black iron oxide (2) Test method Three types of cosmetic pigment dispersions were prepared based on the formulation and production method of Example 1. Instead of sodium alpha olefin sulfonate, the same amount of triethanolamine lauryl sulfate was used, and the other raw materials were the same as in Example 1. The same amount of diethylhexyl sodium succinate was used, and the other raw materials were the same as in Example 1 using the same amount of B, and the same dispersion as in Example 1 (ie, using sodium alpha olefin sulfonate) C). These three kinds of dispersions were each filled in a transparent container (caliber 80 mm) with a capacity of 100 cc, close to the opening, covered, left in a room at 10 ° C., and the state was observed every hour.

(3) Test results a. In dispersion A, black iron oxide separated and began to settle 40 hours after the start of the test. After 43 hours, almost completely separated and settled.
B. In dispersion B, black iron oxide started to separate and settled 65 hours after the start of the test. After 68 hours, almost completely separated and settled.
C. In dispersion C, no separation of black iron oxide was observed even after 120 hours had passed since the start of the test.

(4) Discussion From the above test results, it was confirmed that the separation of black iron oxide can be suppressed by adding alpha olefin sulfonate to a cosmetic pigment dispersion using black iron oxide.

<< Test Example 2 >>
(1) Purpose of test Confirmation of proper use of eyeliner made with alpha olefin sulfonate (2) Test method Maltitol and sodium alginate were added to each of the three dispersions made in Test Example 1. The eyeliner cosmetic was prepared by blending and filled in a pen-shaped container to prepare three types of eyeliner. This eyeliner was used alternately for 10 days by 20 skilled panelists (women), and evaluations were made on the feeling of use (feel) and dispersibility (presence of clogging).

(3) Test results The panelists' evaluation is as follows.
A. Usability (feel)
Person who pushes eyeliner made of dispersion A = 1 person Person who pushes eyeliner made of dispersion B = 1 person Person who pushes eyeliner made of dispersion BC = 18 people b. Dispersibility (with or without clogging)
Person who pushes eyeliner made of dispersion A = 1 person Person who pushes eyeliner made of dispersion B = 0 person Person who pushes eyeliner made of dispersion BC = 19

(4) Discussion From the above test results, it was confirmed that when the alpha olefin sulfonate was added to the pigment dispersion for eyeliner using black iron oxide, both the usability and dispersibility were excellent.

  As described in detail above, the cosmetic pigment dispersion according to the present invention is excellent in dispersibility and feeling of use, and therefore can solve the problems of conventional pen-type container-containing cosmetics using black iron oxide, The application range is not limited to the eyeliner, and can be applied to various makeup products.

Claims (6)

  A cosmetic pigment dispersion comprising black iron oxide combined with a small amount of bengara and alpha olefin sulfonate.   A pigment dispersion for cosmetics comprising black iron oxide combined with a small amount of bengara and alpha olefin sulfonate and sodium sulfate.   The cosmetic pigment dispersion according to claim 1 or 2, wherein the amount of the alpha olefin sulfonate is 3 to 5% by weight.   The cosmetic pigment dispersion according to any one of claims 1 to 3, wherein the mixing ratio of black iron oxide and bengara is 4 to 6 to 1 by weight.   The cosmetic pigment liquid according to any one of claims 1 to 4, which is used by filling a pen-type container.   The cosmetic pigment dispersion according to claim 5, which is used as an eyeliner.