KR890001694B1 - Process for preparing emulsion of microcrystalline ascorbic fatty acid ester pearl and its preparation - Google Patents

Abstract

A method of the production for pul emulsified liquid having fine crystallized ascorbyl fatty acid ester comprises (a) adding 0.3 parts of ascorbylpalmitate, 2.5 parts of polyoxyethylene ricinus oil, 0.02 parts of ethylenediaminetetra sodium acetate, 0.03 parts of sodium hydrogen sulfurous acid and 0.15 parts of paraoxybenzoatemethyl to 90 parts of water. (b) adjusting the mixture having ascorbylpalmitate to pH 4.0 with citric acid. (c) heating the upper mixture.

Description

Preparation method of microcrystalline ascorbyl fatty acid ester pearl emulsion and liquid cosmetic composition using same

The present invention relates to a method for preparing a pearl emulsion obtained by microcrystallization of ascorbyl fatty acid esters such as ascorbyl palmitate, ascorbyl stearate, ascorbyl dipalmitate, and a liquid cosmetic having a pearl effect using the same.

In more detail, polyoxyethylene sorbitan stearate, polyoxy ethylene cetyl ether, polyoxy ethylene hardened castor oil, polyoxy ethylene stearate, polyoxyethylene cholesterol ether, sodium lauryl sulfate, sodium lauryl ether sulfate, etc. 0.2-5.0% of ascorbyl fatty acid ester was added to a 0.2-5.0% aqueous solution of H.H.B. (Hydrophilic Lipophilic Balance) of 10 or more. Gels formed from corville fatty acid esters and surfactants are formed. When this is further cooled down, ascorbyl fatty acid ester becomes an emulsion of fine crystals having a pearl effect. At this time, to stabilize the ascorbyl fatty acid ester, add citric acid, succinic acid, and lactic acid to adjust the pH to 3.5-6.5, and chelating agents 0.005-0.2% of sodium ethylenediaminetetraacetate, sodium metaphosphate, sodium hydrogen sulfite, molar asset 0.01-0.1% of water-soluble antioxidants such as propyl are added. The pearls of ascorbyl fatty acid ester made in this way can be added to general water-soluble cosmetics to make products with a pearl effect.

In general, since pearls are unique and beautiful in appearance, they are widely used in cosmetics and the like. The materials used therein are crystallized synthetic pearls of mica titanium, natural pearls such as guanine, or fatty acids. However, synthetic pearls of mica titanium have excellent pearl stability and pearl effect, but because they have high specific gravity, they are difficult to use except for products with high viscosity.Guanine pearls are expensive and difficult to separate pearl particles of a certain size. The disadvantage is that the crystal grains become larger with time and stabilization is difficult and the pearl effect is not so good.

However, the pearl of the microcrystalline form made of ascorbyl fatty acid ester according to the present invention not only has excellent pearl effect, but also slows down the crystal growth rate over time, and more importantly, fine ascorbic acid derivatives are fine. By crystallization and use, it can be stabilized in a passive liquid, and there is an advantage in that a large amount can be used.

Ascorbic acid fatty acid ester is effective in preventing melanin pigmentation, such as skin whitening effect and blemish removal in cosmetics, etc. This is because ascorbic acid is a strong reducing substance and is known to have melanin production inhibitory effect on the skin. However, ascorbic acid has poor stability in aqueous solution and is easily decomposed and almost no skin absorption. Therefore, ascorbyl fatty acid ester which is esterified by adding fatty acid to ascorbic acid when used as a skin solvent such as cosmetics is mainly used. However, ascorbyl fatty acid ester has disadvantages of extremely poor solubility in water and poor solubility in oils. In addition, its stability in aqueous solution is better than that of ascorbic acid, but it is also a strong reducing substance, and its stability is poor. Therefore, its use is greatly limited when added to cosmetics, except when used as powder itself. It was so bad that only a very small amount could be added.

However, the present inventors dissolve the ascorbyl fatty acid ester in water using a surfactant having an H.L. ratio of 10 or more, and then cool it to form a microcrystalline phase, thereby making the ascorbyl fatty acid ester exist in a solid state in an aqueous solution. In addition, the microcrystals were able to make cosmetics with excellent pearl effect and excellent pearl effect. In addition, ascorbyl fatty acid ester itself was used as a pearl to increase the amount of cosmetics added. That is, by making pearl of ascorbyl fatty acid ester having poor stability in aqueous solution, it is possible to make a product having increased stability and addition amount and also having a pearl effect.

Example 1

To 90 parts by weight of water (hereinafter referred to as parts by weight), 3.0 parts of ascorbyl palmitate, 3.0 parts of polyoxyethylene hardened castor oil, 2.5 parts of ethylenediaminetetrasodium acetate, 0.03 parts of sodium bisulfite, and 0.3 parts of paraoxybenzoic acid methyl were added, followed by stirring. The pH was adjusted to 3.5 with citric acid, water was added to 100 parts in total, and stirred at 60 ° C. to make a solution, followed by cooling slowly to room temperature to prepare microcrystalline ascorbyl palmitate pearl emulsion.

Example 2

To 90 parts of water, 1.0 part of ascorbyl dipalmitate, 0.7 parts of polyoxyethylene stearate, 0.007 parts of sodium ethylenediaminetetraacetate, 0.05 parts of sodium bisulfite, 0.2 parts of methyl paraoxybenzoate are stirred, and the pH is adjusted to 4.5 with citric acid. Water was added to adjust the total amount to 100 parts, dissolved by heating and stirring at 70 ° C., and then slowly cooled to room temperature to prepare a microcrystalline ascorbyl dipalmitate pearl emulsion.

Example 3

To 90 parts of water, add 3.0 parts of ascorbyl stearate, 3.0 parts of polyoxyethylene sorbitan stearate, 0.01 part of sodium metaphosphate, 0.07 part of sodium hydrogen sulfite, 0.15 part of methyl paraoxybenzoate and stir to pH 5.5 with lactic acid. Water was added to adjust the total amount to 100 parts, and the mixture was heated and stirred at 80 ° C. to prepare a solution, and then cooled slowly to room temperature to prepare a microcrystalline ascorbyl stearate pearl emulsion.

Example 4

To 90 parts of water, 2.0 parts of ascorbyl palmitate, 2.0 parts of ascorbyl stearate, 4.0 parts of polyoxyethylene cetyl ether, 0.03 parts of sodium ethylenediaminetetraacetic acid, 0.15 part of methacrylatepropyl, 0.2 part of paraoxybenzoic acid methyl, and stirred After adjusting the pH to 6.5 with lactic acid, adding water to 100 parts in total, stirring the mixture at 90 ° C., heating the solution to form a solution, and then slowly cooling to room temperature to prepare microcrystalline ascorbyl palmitate and ascorbyl stearate pearl emulsions. It was.

Example 5

Flexible Cosmetic Manufacturing Method

Method of Preparation: Add water 1-8 to raw material 14 to form an aqueous phase, and add raw material 9-11 to raw material 12 to obtain an alcohol phase. The alcohol phase is gradually added to the water column, stirred and mixed, and then raw material 13 is added to color.

Example 6

How to make concentrated concentrated water

Manufacturing Method: Add water 1-8 to raw material 14 to obtain an aqueous phase. Raw material 9-11 is added to raw material 12 to obtain an alcohol phase. The alcohol phase is gradually added to the aqueous phase, stirred and mixed, and the raw material 10 is added to color.

Example 7

How to pack

Method of Preparation: Raw material 1-7 was added to the raw material 13, mixed, and the raw material 8-10 dissolved in the raw material 11 was slowly added while stirring, and raw material 12 was added to color.

Example 8

Hydroquinone preparation method

Preparation Method: Raw material 1-10 was added to the raw material 11, followed by stirring and mixing.

Claims (5)

Ascorbyl fatty acid ester was added to the aqueous surfactant solution, and a small amount of a chelating agent and an antioxidant was added to the organic acid as a stabilizer as a pH adjuster, which was dissolved by heating to 60-90 ° C., followed by slow cooling to room temperature. Process for preparing emulsion 2. The method of claim 1, wherein the ascorbyl fatty acid ester is ascorbyl palmitate or ascorbyl stearate or ascorbyl dipalmitate and add 0.2-5.0% thereof. The method of claim 1, wherein 0.2-5.0% of a surfactant having a Hydrophilic Lipophilic Balance of 10 or more is added. The stabilizer for adjusting the pH to 3.5-6.5 by adding an organic acid such as citric acid or lactic acid as a pH adjusting agent, and a chelating agent such as ethylenediaminetetra sodium acetate or sodium metaphosphate, 0.005-0.1%, sodium hydrogen sulfite, molar asset A method for producing a pearl emulsion, comprising adding 0.01-0.2% of an aqueous solution of antioxidant, such as propyl. The skin whitening cosmetic composition which shows pearl which added the ascorbyl fatty acid ester emulsion prepared by the method of Claim 1 to a transparent or translucent liquid cosmetics, and contains ascorbyl fatty acid ester content 0.1-3.0%.