JPS62223108A - Cosmetic pigment coated with chitosan and production thereof - Google Patents

Abstract

PURPOSE:To provide a cosmetic pigment coated with chitosan resistant to accumulation of electrostatic charge, exhibiting antacid action and ulcer- suppressing action in stomach, effective in decreasing cholesterol and triglyceride levels in serum and liver, free from irritation to the skin and suitable for a person of hyper-sensitiveness. CONSTITUTION:A cosmetic pigment is immersed in an aqueous solution of chitosan salt (chitosan is a basic polysaccharide soluble in an aqueous solution of hydrochloric acid, acetic acid, etc.) to cover the surface of the pigment with the aqueous solution. The solution is neutralized with an alkaline liquid (e.g. NaOH) to precipitate chitosan in a state deposited on the pigment surface to obtain the objective cosmetic pigment surface-coated with chitosan as a whole. The cosmetic pigment is a pigment used in cosmetics such as organic pigment, inorganic color pigment, etc., including extender pigment such as titanium oxide, talc, mica, sericite, kaolin, etc., or their various mixtures.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application: The present invention relates to a cosmetic pigment coated with chitosan and a method for its production.

Background of the invention: c'hitosan
It is a deacetylated product obtained by heating H. hitirx) with a concentrated alkali, but at this time the glycosyl bond is decomposed to the extent that it retains, so its properties are not constant. A basic polysaccharide consisting of glucosamine in the form of a white amorphous powder, which is insoluble in water but soluble in hydrochloric acid and other acids. Chitin is a polysaccharide consisting of amino sugars formed with organic skeletons of arthropods, annelids, molluscs, etc., and is obtained, for example, by processing the shells of crabs, shrimps, etc.

Chitosan has an antacid effect in the stomach, an anti-ulcer effect, and a lowering of cholesterol and triglyceride levels in the serum and liver. In addition, without mentioning the eight skins, it is also charged with static electricity and features.

In the present invention, cosmetic pigments include organic pigments, coloring inorganic pigments, titanium dioxide, talc, mica, sericite,
It refers to pigments that are widely used in cosmetics, including essential pigments, such as mixtures of one or more types of Kaori Y and the like.

Problem to be solved: Cosmetic pigments affect the human body depending on their physical and chemical properties, and they can have a serious sensitizing effect, especially on people with a predisposition to hypersensitivity. Since the product itself is a mixture, it is difficult to determine which component is causing the problem.

Therefore, regardless of the type of cosmetic pigment, it has a certain protective effect on the skin, preferably a mild therapeutic effect 1crEJ
It is desirable to denature the material in a similar way.

Means for solving all problems: In the present invention, the surface of the cosmetic pigment described above is coated with chitosan.

In the non-inventive sense, "to coat" means to cover the surface of the pigment with another substance, and as for the form of coating, a single plate eM type in which each pigment particle is covered independently like the skin of a fruit is preferable. However, in reality, substances like sugar beans (several beans are fused together with sticky type II) that activate and decompose individual pigment particles are also unavoidably produced. Therefore, these joint covering walls are also included.

Action: By immersing a cosmetic pigment in an aqueous solution of dried tosan salt (chitosan is a basic polysaccharide that dissolves in aqueous solutions such as hydrochloric acid and acetic acid), the aqueous solution adheres to the surface of the pigment.

When the attached aqueous solution is neutralized with an alkaline liquid such as sodium hydroxide, chitosan is deposited on the pigment surface and completely covers the pigment surface.

Next, since chitosan adheres to the surface of the pigment particles, a chitosan treatment is applied, which increases the oil absorption of the pigment, but the red 22
Table 1 shows the amount of linseed oil and oleic acid absorbed by setting No. 6 to -j.

That is, by attaching chitosan to the pigment surface, the amount of absorption of linseed oil 2 and oleic acid increases dramatically, resulting in J? j
), it can be seen that the surface of the pigment has changed.

In the present invention, acetic acid,
Hydrochloric acid, phosphoric acid, etc. are preferable, and the degree of 4 degrees is acceptable as long as chitosan can be dissolved therein, but for example, 0 degrees.
2% to 15% acetic acid, 0.5% to 7% hydrochloric acid, 0.5 to 15%
10% phosphoric acid is suitable.

There is no limit to the concentration of chitosan dissolved in these acids, as long as the resulting mixture has fluidity, but it may range from 0.2 to
The range of 3-chi is suitable. This is preferably determined each time depending on the average molecular structure of the chitosan used, the type and physical properties of the pigment to be treated, the slurry concentration during treatment, etc.

Example 1 (Sample 1) 50 g of Red No. 226 (5,5'-dichloro-3,J-methyltheoi/Zigo: for cosmetics manufactured by Daito Kasei Kogyo Co., Ltd.) in a mixed solution of 200 m of water and LO ml of ethyl alcohol
was added, stirred vigorously to disperse, and further water was added under pressure to form a dispersion of 500 particles. Separately, 0.5 chitosan 1y
Wt% vinegar a 200,? An aqueous solution was prepared by diluting the solution dissolved in water to 400 d with water, and while stirring the dispersion, it was gradually added using a dropping F funnel over a period of about 50 minutes (liquid temperature 40'C). ). After that, the temperature was raised to 60°C.
Hold for 30 minutes, filter, dry, crush and coat with chitosan.
Red No. 226 was obtained.

Example 2 (Sample 2) Internal volume 2000. Commercially available talc 50y in a wt beaker
And water 1100! Il and stirred to make a suspension, to which was added 1.5 g of commercial red iron oxide and commercially available organic pigment red 22.
Add No. 6 0.15N dispersed in 200 ml of water while stirring, and add 1300 g of water. Obtain a suspension containing nine. This was kept at 40'C, and further, sulfuric acid clay Ae2 (
S04) 3・18f (zo 3Z71 with 400 ml of water
iCg % L 7'C aqueous solution was added dropwise at a rate of 5 ml/dose, and then 10 g of Na2S 5 f/100
An aqueous solution dissolved in rd water was added dropwise at a rate of 2 Hl/m. Coarsely, a 5 wt % aqueous solution of Na2C4)3 was added dropwise at 2, xt/yum to adjust the pf to about 7.

While stirring continuously, raise the temperature to 60°C and mature for 1 hour. Thereafter, the temperature was lowered at 40" (t), and a solution of chitosan 1] dissolved in 200 g of 0.5 wt% acetic acid was further diluted with water to make 400 liters, while stirring. Injected slowly over 50 minutes, followed by Na
The pH was adjusted to about 7 by neutralization with a 5% by weight aqueous solution of zCo@. This material was heated to 60°C and maintained for 30 minutes for ripening. After that, it is filtered, washed, dried and crushed.
A Gitosan 4-cover composite pigment was obtained.

Effects of the invention: The chitosan-coated cosmetic pigments of the invention were subjected to sensory tests, especially for lipstick.

Lipstick A using the pigment according to the invention and for the normal face Base: Mustard oil 45.3 Thihexadecyl alcohol 25.0 Lanolin
4.0 Beeswax (yellow) 5.
0 Nasikerite 4.0 Candelilla wax 7.0 Carnauba wax
10 Colorant Titanium dioxide (Product according to the present invention) 2.0 Red No. 226 () λ5 5 Red No. 204 () λ5 Orange No. 201 0.7 Stick-type lipstick B (normal gradient use) Base material: Castor oil
45.3 Thihexadecyl alcohol
25.0 lanolin
4.0 Beeswax (yellow) 5.0 Osichelite 4.0 Candelilla wax 7.0 Carnauba wax
2.0 Color material: Titanium oxide
2.0 Red No. 226
2.5 Red No. 204 2.5
Orange No. 201 0.7 Production method: First, store agent IJX is melted by heating and mixed uniformly. Add the coloring material to the mixture, knead it with a roll mill to disperse it evenly, re-melt it, put it in a vacuum desiccator, suction it, defoam it, take it out, load it into a container, and then check the appearance of the stick. To prepare it, we used all the gas burners and did some framing to make the surface even.

Thirty women aged 25 to 60 (7 in their 20s, 10 in their 30s, 8 in their 40s, and 5 in their 50s) were asked to apply lipstick A, 9, and lipstick B.

After application, the subjects were allowed to read for 3 hours and 5 hours in a constant temperature and humidity room adjusted to a temperature of 35'C and a humidity of 60%.

As a result, out of the above 30 people, if you use lipstick B;
Six people felt itching on their lips after reading for 3 hours, and 9 people felt itching on their lips after reading for 6 hours. On the other hand, when using lipstick A,
Among the 30 people mentioned above, only 1 person felt itching after reading for 3 hours and 3 people felt itching after reading for 6 hours.

Claims (1)

[Claims] 1. Cosmetic pigment coated with chitosan. 2. Cosmetics coated with chitosan, characterized in that an acidic aqueous solution of chitosan containing a cosmetic pigment in suspension is neutralized with an alkaline aqueous solution to precipitate chitosan on the surface of the cosmetic pigment and remove the liquid phase. method for producing pigments for use in