Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Patent
1998-05-14
2000-09-12
Dees, Jose G.
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
424450, 514937, 514938, 514944, A61K 700
Patent
active
061174343
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a moisturizing composition, a base containing the same, and a cosmetic or external preparation containing the moisturizing composition.
BACKGROUND ART
It is well-known that moisture is deeply involved in various products such as cosmetics, pharmaceuticals, agricultural chemicals and foods, and moisturization thereof is one of important functions for the quality of the products. It is also well-known that moisture is deeply involved in the retention of youthful skin, and the moisturization of skin is one of important functions for the quality of cosmetics.
As known moisturizing agents, particularly known moisturizing agents used in cosmetics or external preparations, there are polyhydric alcohols such as glycerol, 1,3-butylene glycol and sorbitol, and further pyrrolidonecarboxylate salts, lactate salts, etc. In recent years, sodium hyaluronate produced by a microorganism has come to be used.
Moisturizing agents also play an important role to work as an agent retaining the moisture of cosmetics or external preparations themselves and thereby contribute to the retention of the stability of the system. Trihydric or more polyhydric alcohols such as glycerol and sorbitol have excellent moisturizing properties and moisture retainability, and further in view of their safety, stability, prices, etc., are used as most general purpose moisturizing agents.
As to requirements which moisturizing agents should have, it is desirable that they are not influenced by environmental conditions (temperature, humidity, wind, etc.), and particularly can retain moisture for a long time regardless of the surrounding humidity. However, in the case of any moisturizing agent, the amounts of the absorption and release of moisture are influenced by the surrounding humidity because of its vapor pressure. In the case of glycerol, for instance, its equilibrium moisture content at 25.degree. C. is 60% when the relative humidity is 75%, and 15% when the relative humidity is 33%, and in the case of sorbitol, its equilibrium moisture content at 25.degree. C. is 50% when the relative humidity is 75%, and 5% when the relative humidity is 33%, and their moisture contents are influenced by the degree of the surrounding relative humidity.
Thus, there is a problem that when the surrounding humidity is low, the moisturizing agent itself releases the retaining moisture and the amount of moisture retained is lowered. Also when cosmetics or external preparations containing moisturizing agents are used, as understood from the above, moisture is lost from the skin with time lapse under low humidities, and the moisturizing function is lowered. Therefore, as to moisturizing agents, it is necessary that the evapotranspiration of moisture under low humidity environments is slow.
DISCLOSURE OF INVENTION
This invention has been made in view of the above problems, and aims to provide a moisturizing composition excellent in moisturizing properties and stability, bases based thereon, and a cosmetic or external preparation containing the moisturizing composition.
The above object has been attained by
(1) a moisturizing composition comprising a trihydric or more water soluble polyhydric alcohol, lecithin and 3-methyl-1,3-butylene glycol, wherein lecithin:the trihydric or more water soluble polyhydric alcohol+3-methyl-1,3-butylene glycol=1:1,000 to 1:1 (weight ratio) and the trihydric or more water soluble polyhydric alcohol:3-methyl-1,3-butylene glycol=1:10 to 20:1 (weight ratio),
(2) A viscous or gel-like base which comprises the moisturizing composition of the above (1) having compounded therein an oily substance.
(3) An oil-in-water type emulsion base which comprises the moisturizing composition of the above (1) having compounded therein an oily substance and water.
(4) A solubilized base which comprises the moisturizing composition of the above (1) diluted with water.
(5) A cosmetic which comprises the moisturizing composition of the above (1) and other raw material(s) for cosmetics.
(6) An external preparation wh
REFERENCES:
patent: 5456915 (1995-10-01), Nagase et al.
patent: 5709849 (1998-01-01), Ito et al.
Fujisawa Masaaki
Narita Toshie
Oyama Keiichi
Tsuchiya Naoko
Tsuji Misako
Dees Jos,e G.
The Nisshin Oil Mills Ltd.
Williamson Michael A.
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