CA1141298A

CA1141298A - Cosmetic

Info

Publication number: CA1141298A
Application number: CA000354860A
Authority: CA
Inventors: Kazushige Suzuki; Kenichi Sakon; Mitsuru Matsumura
Original assignee: Noevir Co Ltd
Current assignee: Noevir Co Ltd
Priority date: 1979-12-29
Filing date: 1980-06-26
Publication date: 1983-02-15
Also published as: JPS5697208A

Abstract

Abstract Cosmetic composition containing as emulsion stabiliser a soap formed by reaction of a basic amino acid and a higher fatty acid together with a polyvalent alcohol. As the amino acid is a natural product, it is less irritating to the skin than the conventional soap-forming alkali materials. The polyvalent alcohol improves the stability of the product.

Description

1~4~.X98 Cosmetic The present invention relates to a cosmetic. Cosmetics using emulsion stabilizers in the form of salts formed by the reaction of such bases as sodium hydroxide, potassium hydroxide and triethanolamine and higher fatty acids are known. The use of sodium hydroxide or potassium hydroxide, however, requires high temperatures and long periods of time, for example, 95C and 30 minutes, for reaction with fatty acids. This can result in deterioration of the ingredients. Further, the use of triethanolamine presents a problem of ingredients turning yellow.
Recently, these basic materials have been suspected of a cumulative irritation, their harmlessness to the skin has been doubted, and research has been carried out, looking for safer substitutes.

The present invention has been accomplished with the above in mind and has for its object the provision of a cosmetic which presents reduced irritation and increased skin safety, gives an improved feel to the skin, does not require a long reaction time for its preparation, and is superior in thermal and long-term stability.

The present invention provides a cosmetic comprising a basic amino acid, a higher fatty acid and a polyvalent alcohol.

The invention will now be described in more detail. Basic amino acids are constituents of the human body and are less irritative to the skin than sodium hydroxide, potassium hydroxide, 1~4~X98 triethanolamine and the like. The applieable basic amino acids include lysine and arginine. The in~ention is to use soaps, formed by the reaction of basic amino acids and higher fatty acids, as emulsifiers. The applicable higher fatty acids include lauric acid, stearic acid, cerotic acid and any other acids that are usually used in cosmetics. Thouyh not in a limiting sense, acids which contain from 12 to 20 carbon atoms are particularly preferable.

On the other hand, cosmetics produced from basic amino acids and fatty acids are inferior in thermal stability, failing to withstand long~term preservation, a fact which greatly detracts from their marketable values. The addition of polyvalent alcohols thereto provides thick colloidal dispersions which are homogeneous with respect to water, greatly improving thermal stability, and rendering the cosmetics stable for a long term and highly agreeable to the touch. The applicable polyvalent alcohols include glycerine, 1,3-butylene glycol, propylene glycol, sorbitol, and polyethylene glycol. The amount of a polyvalent alcohol to be used, though varying depending on the kind of alcohol used, is suitably 5-40% by weight with respect to the total weight of the cosmetic. Although amounts outside this range axe usable, less than 5% by weight would result in a great decrease in the contribution of polyvalent alcohols to the reaction between the basic amino acids and higher fatty acids and to the thermal stability, while the use of more than 40% by weight would result in problems of lack of whiteness of the resulting cosmetic cream or in some increase in the wettish stickiness of the cream.

The cosmetics according to the present invention are used chiefly as cosmetic creams, and the production of such cosmetic creams may follow the usual practice. More particularly, an oil phase consisting of an oil component, such as bees wax, liquid paraffin or a higher alcohol, mixed with a fatty acid is heated to about 80C for complete melting and mixing, while hydrophilic components, such as the polyvalent alcohol and the basic amino acid, are added to refined water and the mixture is heated to about 80C to ~4~8 prepare a water phase. The oil phase and the water phase are mixed and stirred. The solvent power of the polyvalent alcohol facilitates reaction between the basic amino acid and the higher fatty acid, so that they react with each other at once.
Thus, without requiring a period of time of about 30 minutes at a high temperature as in the conventional case, they are cooled at once and a perfume and an antiseptic are added th~reto to provide a product.

In addition, in formulating compositions in accordance with the present invention, besides the main ingredients consisting of said basic amino acid, polyvalent alcohol and higher fatty acid, one or more members selected from the class consisting of hydrocarbons, animal and vegetable oils, higher alcohol esters, surface active agents, viscosity increasing agents and other cosmetic ingredients may be incorporated so long as they do not spoil the characteristics of the cosmetic formed of the basic amino acid polyvalent alcohol and higher fatty acid.

Since the cosmetic of the present invention is composed of a basic amino acid, a higher fatty acid and a polyvalent alcohol, as described above, it is possible to minimize irritation and maximize skin safety by the basic amino acid. Further, the higher fatty acid is stably and uniformly dispersed in water by making use of the polyvalent alcohol. Thus, the cosmetic is thermally stable for a long term and has a satisfactory feel.

Examples will now be given but the invention is not limited thereto, and nonionic, anion and cation surfactants may be supplementarily used.

~14~2.98 Example 1 Composition w/w~

( Bees wax 2.0 A( Stearic acid 10.0 ( Cetanol 1.0 ( 1,3-butylene glycol 20.0 B ( L-arginine 1.0 ( Refined water 66.0 C( Perfume and antisepticsuitable amounts Method of production A was heated to about 80C for uniform melting, and B, which was preheated to 80C, was added thereto, the mixture being stirred and then cooled, to which C was added, thereby providing a product.

Example 2 15 Composition w/w%

(Liquid paraffin 5.00 A (Stearic acid 1.00 ( Glyceryl monostearate 1.00 ( Glycerine 5.00 20 B (Carboxyvinyl polymer 0.10 (L-arginine 0.30 ( Refined water 87.60 C (Perfume and antisepticsuitable amounts Method of production 3L~4~

The same procedure as in Example 1 was followed to provide a product.

The cosmetic creams according to Examples 1 and 2 were used by 61 men and women by way of test for one month each, the results being shown in Table 1.

Table 1 Test item Opinion %

Condition of cream Hard 3 Moderate 42 Soft 55 Feel during use Spread well 80 Normal 17 Bad 3 Light 50 Normal 36 Unctuous 14 -Feel after use Moist 50 Normal 36 Something lacking 14 Pleasant 50 Normal 42 Unpleasant 8 Irritation None 98 Itchy Tingling 0 Others ~41~98 Thus the test results prove that the creams feel satisfactory to the touch and give no irritation~

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. An oil-in-water emulsion cosmetic composition comprising an oil phase, a water phase, and an emulsifier, said oil phase comprising one or more oil components and a higher fatty acid, said water phase comprising a polyvalent alcohol and a basic amino acid which is a constituent of the human body, said emulsifier being a soap produced by the reaction of said higher fatty acid with said basic amino acid.

2. A cosmetic composition as set forth in claim 1, wherein the oil component is selected from the group consisting of bee's wax, liquid paraffin and higher alcohols.

3. A cosmetic composition as set forth in claim 2, wherein the polyvalent alcohol is 5-40 wt.% of the total composition.

4. A process for producing an oil-in-water cosmetic composition comprising the steps of:
(a) mixing 5-40 wt.% polyvalent alcohol based on total compostion with a basic amino acid which is a constituent of the human body and refined water, and thereafter heating to about 80 degrees C. to form a water phase;
(b) mixing a higher fatty acid with an oil component, and thereafter heating to about 80 degrees C. to form an oil phase; and (c) mixing said water phase with said oil phase at a temperature of about 80 degrees C., whereby said basic amino acid reacts with said higher fatty acid to form a soap which emulsifies the composition.

5. A process for producing a cosmetic composition as set forth in claim 4, wherein said oil component is selected from the group consisting of bee's wax, liquid paraffin and higher alcohols.