External skin-care composition

Details External skin-care composition External skin-care composition

1998-10-28

2001-03-20

Kishore, Gollamudi S. (Department: 1615)

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Cosmetic, antiperspirant, dentifrice

C536S123100, C514S944000, C514S780000, C514S781000

Reexamination Certificate

active

06203804

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an external skin-care composition which has a high cooling effect and excellent stability properties.
2. Discussion of Background
Agar has been used for a long time as a food material. Agar is also used as a thickener for cosmetic compositions and drugs for external application.
However, products for external application containing agar as a thickener undergo water separation when they are stored for a long period of time or kept at a high temperature, so that their uses have been limited. For example, a facial preparation for dry skin is disclosed in USSR Patent No. 719630 and contains a rennet ferment, carboxymethyl cellulose, glycerol, ethanol, perfume base and water, where sufficient amounts of neutral proteinase, elastase, collagenase, agar, boric acid, dye and menthol are added for the purpose of improving the skin tissue-softening effect and vital tissue-regenerating effect.
In recent years, agar having high flowability such as the low-strength agar disclosed in Japanese Patent Application Laid-Open No. 56625/1994, has been developed, and are used in cosmetic compositions to improve their properties.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an external skin-care composition which is stable without undergoing water separation and has an excellent cooling effect, and gives users a pleasant feeling of coolness.
The present inventors have discovered that when an external skin-care composition is prepared by using agar having a specific jelly strength and a water-soluble polymer to provide an aqueous gel, the stability of the system is markedly improved, and an excellent cooling effect based on the high water-retaining ability of the agar can be achieved. The present inventors have also found that when a cooling agent is used in combination with the components described above, the cooling effect can be still more enhanced, thus leading to completion of the present invention.
Accordingly, the present invention provides an external skin-care composition comprising the following components (A), (B), (C) and (D):
(A) low-strength agar having a jelly strength of 250 g/cm
2
or lower as measured at an agar concentration of 1.5 wt. % in water;
(B) a water-soluble polymer;
(C) a cooling agent; and
(D) water.
The external skin-care composition according to the present invention has a high cooling effect, a feeling of coolness and excellent stability.
A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:


REFERENCES:
patent: 4291025 (1981-09-01), Pellico
patent: 5385729 (1995-01-01), Prencipe et al.
patent: 5502181 (1996-03-01), Kojima et al.
patent: 5961990 (1999-10-01), Delrieu et al.
patent: 406056625 (1994-03-01), None
patent: 719360 (1980-03-01), None
patent: 719630 (1980-03-01), None
patent: WO 95/23815 (1995-09-01), None

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