Compositions – Preservative agents – Anti-corrosion
Patent
1997-04-16
1999-07-06
Lovering, Richard D.
Compositions
Preservative agents
Anti-corrosion
424401, 514873, 514944, 516104, 516108, A61K 700, A61K 910, B01J 1300
Patent
active
059193980
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an oil-water mixed composition, and in particular, relates to an improvement of oil- water mixed mechanism of the composition.
BACKGROUND ART
Some cosmetics and drugs have a formulation of an oil-in-water or a water-in-oil emulsion mainly composed of a water phase and an oil phase component such as milky lotion, cream or ointment.
Conventionally, a surfactant is required in order to manufacture such an oil-in-water or water-in-oil emulsion.
However, a surfactant used in conventional cosmetic treatment often causes skin irritation, so not a few consumers feel misgivings. In addition, an oil-in-water or water-in-oil emulsion containing a surfactant is often criticized as being unstable with passage of time, sticky, and poor in water resistance.
Under these circumstances, several emulsions containing little or no surfactant have recently been developed.
For example, instead of using a surfactant, it is known the emulsion which uses clay mineral (Japanese Unexamined Patent Publication No.56-150007, No.57-16812, No.58-124535 and Japanese Patent Publication No.64-3529), silicone oil (Japanese Unexamined Patent Publication No.61-66752), glycyrrhizin Japanese Unexamined Patent Publication No57-62214), and the like as emulsifier or assistant emulsifier.
Nevertheless, the emulsions shown above do not appear to have improved the stability of the emulsions with passage of time, and, it is too early to speculate at this time that the emulsions shown above have solved the problems relating to skin irritation, stickiness and water resistance.
DISCLOSURE OF INVENTION
In view of the foregoing problems of the prior art, the objective of this invention is to provide an oil- water mixed composition which is superior in stability and safety, without relying upon the use of a high amount of surfactant.
As a result of diligent studies of the inventors to attain the above-mentioned object, it has been found that an oil-water mixed composition which has excellent stability without a surfactant can be acquired by dispersing a water phase into solid or semisolid oil phase uniformly at room temperature, and thus this invention has been accomplished.
Namely, in embodiment 1 an oil-water mixed composition in accordance with the present invention is characterized in that it contains a solid or semisolid oil phase at room temperature, and a water phase dispersed into said oil phase at room temperature.
Preferably, the water phase contains a humectant and is solid or semisolid at room temperature.
Preferably, the oil phase contains an oil component which makes the oil phase solid or semisolid at room temperature constitutes 10 to 70% by weight with respect to the whole amount of the oil-water mixed composition.
Also preferably, the humectant in the water phase constitutes 10 to 70% by weight with respect to the whole amount of the oil-water mixed composition.
Preferably, the oil-water mixed composition does not contain a surfactant practically.
In embodiment 2, the oil phase contains a hydrophobic silica and is solid or semisolid.
Also preferably, the oil phase forms a continuous phase.
Preferably, the hydrophobic silica constitutes 0.1 to 10% by weight with respect to the whole amount of the oil-water mixed composition.
Preferably, the oil phase contains an oil component which makes the oil phase solid or semisolid at room temperature constitutes 1 to 70% by weight with respect to the whole amount of the oil-water mixed composition.
Preferably, the water phase contains a humectant and the humectant constitutes 1 to 70% by weight with respect to the whole amount of the oil-water mixed composition.
Preferably, the oil-water mixed composition does not contain a surfactant practically.
In embodiment 3, the oil phase contains a dextrin fatty acid ester and is solid or semisolid.
Also preferably, the oil phase forms a continuous phase.
Preferably, a dextrin fatty acid ester constitutes 0.1 to 10% by weight with respect to the whole amount of the oil- water mixed composition.
Preferably, the oil
REFERENCES:
patent: 4772592 (1988-09-01), Benzoni
patent: 4780145 (1988-10-01), Mori et al.
patent: 5061481 (1991-10-01), Suzuki et al.
patent: 5362482 (1994-11-01), Yoneyama et al.
Abe Koji
Ito Kenzo
Nakamura Fumiaki
Lovering Richard D.
Shiseido Co. Ltd.
Snider Ronald R.
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