JPS59212418A - Agent for giving pearl-like gloss - Google Patents

Abstract

PURPOSE:An agent for giving pearl-like gloss that is composed of lecithin which has been hydrogenated so that its iodine value is in a specific range, thus giving detergents such as shampoo fine and stable pearl-like gloss by mixing in a usual manner, without adverse effect on foaming ability of the detergent. CONSTITUTION:Lethicin is hydrogenated by a known method, e.g., in the presence of a Ni or noble metal catalyst at elevated temperature and pressure so that its iodine value becomes 0-40 to give the objective agent giving pearl-like gloss. The agent is added to a liquid composition of detergent such as shampoo or rinse and cosmetics by 0.5-20wt%, preferably 1-8wt%, dissolved with heat, then cooled under stirring to precipitate fine crystal having pearl-like gloss. Or it is added to a surfactant solution in a high concentration, then converted into a pearl-like gloss dispersion by the above-stated method, then added to a variety of cosmetics.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel pearlescent agent for cosmetics made of a compound obtained by hydrogenating lecithin.

Conventionally, natural compounds such as mica and fish phosphorus foil have been used to give liquid compositions such as shampoos and conditioners pearlescent luster and increase their commercial value, but these are expensive, thin, and natural compounds. Recently, synthetic pearlescent agents such as fatty acids, fatty acid esters, fatty acid alkylolamides, and polyalkylene glycols have been frequently used because it is difficult to obtain pearls of consistent quality. Examples of such synthetic pearlescent agents include stearic acid, ethylene glycol monostearate, ethylene glycol distearate, triethylene glycol distearate, palmitic acid monoethanolamide, and stearic acid monoethanolamide. Are known. These synthetic pearlescent agents are difficult to obtain fine and stable pearlescent luster when they are once dissolved and then cooled to precipitate crystals. Further, there are drawbacks such as agglomeration of the obtained pearlescent luster, loss of luster, and deterioration of foaming properties in liquid detergents that place emphasis on foaming properties, such as shampoos and harsh detergents.

The present inventors have overcome the drawbacks of such conventional pearlescent agents, and have developed a new product that can easily obtain fine pearlescent luster using a conventional method and does not impair foaming properties even when added to liquid detergents. As a result of intensive research to develop a pearlescent agent, it was discovered that a specific hydrogenated lecithin could achieve the purpose, leading to the completion of the present invention.

That is, the present invention relates to a pearl luster imparting agent for cosmetics, characterized by comprising hydrogenated lecithin having an iodine value of 0 to 40.

The hydrogenated lecithin in the present invention is obtained by hydrogenating lecithin to an iodine value of 40 or less by a known method.

The type of lecithin used as a raw material is not particularly limited, but examples include soybean lecithin, egg yolk lecithin, corn lecithin, cottonseed oil lecithin, and seed lecithin. A general method for producing the hydrogenated lecithin used in the present invention includes a known method, such as a method in which lecithin is hydrogenated in the presence of a nickel or noble metal catalyst under high temperature and high pressure conditions until the iodine value reaches 40 or less. Hydrogenated lecithin whose iodine value exceeds 40 due to insufficient hydrogenation is not desirable because pearlescent luster cannot be obtained.

The pearl luster imparting agent of the present invention may be composed of hydrogenated lecithin, and other components may include fatty acids,
Those containing synthetic pearlescent agents such as fatty acid esters, polyalkylene glycol esters, and fatty acid alkylolamides may also be used.

The pearlescent agent of the present invention can be used in liquid compositions such as shampoos, rinses, liquid cleansing agents, cosmetics, etc.
-20% by weight, preferably 1 to 8% by weight, preferably 1 to 8% by weight. After heating and dissolving Cal, it may be used by cooling with stirring to precipitate fine crystals with pearlescent luster. All methods may be adopted in which the pearlescent dispersion is prepared by adding it to a concentrated concentration, dissolving it at a low temperature, and then cooling it while stirring to form a pearlescent dispersion, which is then blended into various cosmetic products.

As described above, the pearl luster imparting agent of the present invention imparts fine and stable pearl luster through a normal compounding method, and can also be used in shampoos, liquid detergents, etc. without impeding the foaming power and produces beautiful pearl luster. It has a very wide range of applications. Hereinafter, the present invention will be explained in detail with reference to Examples and Comparative Examples.

Examples 1 to 6, Comparative Examples 1 to 5 Each component was mixed according to the recipe shown in Table 1, heated to 85°C to form a transparent solution, and then cooled to 25°C with stirring to give a pearlescent luster. Shampoo 1-obtained. The types and amounts of pearlescent agents in Table 1 were changed according to Table 2, and the physical properties of each shampoo obtained were all measured and evaluated, and the results are shown in Table 2.

Table 1 Table 2 Note 1) Softazoline N5J (Yoken Fine Chemical ■
Product) Usability 2) Ross Miles Foaming Power, 1% Aqueous Solution, 4
Measurement after 5 minutes at 0° C. Evaluation of pearlescent luster and stability was performed as follows.

Evaluation of (pearl luster) The samples were spread on a black glass board and visually judged according to the following criteria.

◎・・・・・・Has a beautiful pearlescent luster ○・・・・・・
- Some pearlescent luster ×...Evaluation of white turbidity (stability) The pearlescent gold-containing shampoo was left at 40° C. and the state of pearlescent luster was observed.

○・・・Nearl luster was stable for more than 7 days Δ・・
...The pearls of the present invention agglomerated or lost their luster within 1 to 7 days ×...The pearls of the present invention agglomerated or lost their luster within 1 day. It is clear that the shampoo containing the gloss-imparting agent has a fine pearlescent luster and is stable, and its foaming power is not impaired. On the other hand, the shampoos shown in the comparative examples containing unhydrogenated soybean lecithin, hydrogenated lecithin with an iodine value exceeding 40, and ethylene glycol fatty acid esters did not provide pearlescent luster or were unstable. Even if it were obtained, it had drawbacks such as a decrease in foaming power.

Example 7 (Hair shampoo formulation) Polyoxyethylene (n=3) sodium lauryl ether sulfate 5.7wt%
Lauryl sulfate triethanolamine salt 5.
7. Lauric acid jetanolamide
5.0・Hydrogenated lecithin (iodine value 2.O)5.
0/Water Balance All ingredients were mixed according to the above recipe, heated and dissolved at 85°C, and then cooled to 25°C with stirring to prepare a pearlescent shampoo. This product had good pearlescent luster and foaming.

Example 8 (Hair rinse formulation) Distearyldimethylammonium chloride
2wt% polyoxyethylene (n=20) rubitan monolaurate
1. Hydrogenated lecithin (iodine value 9.4)
5.Water
Balance Each component was mixed according to the above recipe, heated and dissolved at 85°C, and then cooled at 25°C with stirring to prepare a pearlescent rinse. The pearlescent luster of this product was excellent.

Example 9 (Skin lotion formulation) - Hydrogenated lecithin (iodine value 9.4)
2wt%・Polyoxyethylene polyokine propylene cetyl ether 1・
Marbit 5
-Propylene glycol
5I ethanol
50/Water 37 A pearlescent skin lotion having the above composition was prepared. The pearlescent luster of this product was excellent.

Example 10゜ (body shampoo formulation) - Sodium lauryl sulfate 8
．． 5wt% Coconut oil fatty acid jetanolamide
3.0・Hydrogenated lecithin (iodine value 20.0
) 3.0° salt
1.0, water
Balance The above components were mixed and dissolved by heating to 85°C, and then cooled to 25°C with stirring to prepare a pearlescent body shampoo. This product had good pearlescent luster and foaming.

Example 11゜ (hand soap formulation) ・Polyoxyethylene (ri=3) sodium lauryl ether sulfate 6 vt t
% Sodium lauryl sulfate
5. Lauric acid jetanolamide
3. Sodium lauroyl sarcosine
5. Hydrogenated lecithin (iodine (i9.4)
3.Water
Balance All of the above ingredients were mixed, heated to 85°C and dissolved, and then cooled to 25°C with stirring to prepare a pearlescent hand soap. This product has a good pearlescent luster and foam, making it a perfect companion.

Patent applicant: Kawaken Fine Chemicals Co., Ltd. Ajinomoto Co., Inc.

Claims (1)

[Claims] 1. A pearl luster imparting agent for cosmetics, characterized by comprising hydrogenated lecithin with an iodine value of 0 to 40.