Aqueous dispersion of pigment for cosmetic preparations and method for producing same
A technology for dispersions and cosmetics, applied in cosmetic preparations, cosmetics, cosmetics, etc., can solve the problems of water resistance and other problems
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[0037] The preparation method of the aqueous dispersion is described in more detail below.
[0038] The aqueous dispersion containing cosmetic pigments of the present invention is produced by silylation of cosmetic pigments with alkyltrialkoxysilanes in the presence of hydroxypropylmethylcellulose phthalate in water. owned. The pH of the reaction solution is preferably alkaline, and sodium carbonate or the like may be added to make the pH alkaline. In addition, it is preferable to add a base catalyst in this reaction. That is, while stirring hydroxypropylmethylcellulose phthalate and cosmetic pigments in ammonia water with a mixer such as a homogenizer, alkyltrialkoxysilane was added dropwise to make it mix with cosmetic pigments. A silylation reaction is performed to disperse in water. The reaction temperature may be appropriately adjusted, but it is preferably performed at room temperature to 80°C. Next, after distilling off ammonia and by-produced ethanol, it neutralize...
Embodiment 1
[0065] [Example 1] Preparation of Aqueous Dispersion 1 of Titanium Oxide
[0066] Mix and dissolve 2 g of hydroxypropylmethylcellulose phthalate (trade name HP-55 manufactured by Shin-Etsu Chemical Co., Ltd.), 2 g of sodium carbonate, and 196 g of ion-exchanged water to prepare 1% by mass of HP -55 aqueous solution.
[0067] Add 130 g of the above-mentioned 1% by mass HP-55 aqueous solution to 30 g of ion-exchanged water, and stir with a homomixer (5000 rpm) while adding 70.2 g of titanium oxide STR-100C (manufactured by Sakai Chemical Industry Co., Ltd. ), 53g of ion-exchanged water and 22.5g of 25% ammonia water. While stirring at 25° C., 9 g of methyltriethoxysilane was continuously added dropwise over 30 minutes. Next, after raising the temperature to 60°C for 1 hour of aging reaction, while maintaining the temperature at 60-70°C, vacuumize, distill and remove 80ml of water containing ammonia and ethanol from the system and pump it out of the system to obtain about 297g ...
Embodiment 2
[0068] [Example 2] Preparation of aqueous dispersion 2 of titanium oxide
[0069] 2 g of hydroxypropyl methylcellulose phthalate (manufactured by Shin-Etsu Chemical Co., Ltd., trade name HP-55), 2 g of sodium carbonate, and 196 g of ion-exchanged water were mixed and dissolved, and 1% by mass was prepared in advance. HP-55 aqueous solution.
[0070] Add 200 g of the above-mentioned 1 mass % HP-55 aqueous solution 200 g, while stirring with a homomixer (rotation number: 5000 rpm), add 70.2 g of titanium oxide STR-100C (manufactured by Sakai Chemical Industry Co., Ltd.) and 6.3 g of AQUADEWSPA-30 (manufactured by AJINOMOTO CO., INC, sodium polyaspartate), 53 g of ion-exchanged water, and 22.5 g of 25% ammonia water. While stirring at 25° C., 9 g of methyltriethoxysilane was continuously added dropwise over 30 minutes. Next, after raising the temperature to 60°C for 1 hour of aging reaction, while maintaining the temperature at 60-70°C, vacuumize, distill and remove 80ml of wat...
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