Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2001-01-16
2003-07-01
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S684000, 57
Reexamination Certificate
active
06585986
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a gelation agent and a gel composition. More specifically, the present invention relates to a gelation agent which can be added and mixed to a wide range of oils to produce oil based gels with superior stability, safety and usability for applications such as cosmetics and quasi-drugs, as well as a gel composition.
The present invention relates to an emulsifying agent and an emulsified composition. More specifically, the present invention relates to an emulsifying agent which can be added and mixed to a wide range of oils to achieve the water-in-oil type (hereafter referred to as the W/o type) emulsion without using a conventional nonionic surfactant, and an emulsified composition with superior stability, safety and usability using this emulsifying agent.
The present invention relates to a sunscreen cosmetic. More specifically, the present invention relates to a sunscreen cosmetic which has the characteristics of having superior water resistance as well as preventing the whiteness of the ultraviolet light protection powder from being conspicuous.
BACKGROUND OF THE INVENTION
Conventionally, for oil swelling gelation agents, it has been known that a gel with good usability can be prepared by mixing a specific nonionic surfactant with an organic modified clay mineral obtained by exchanging water and/or exchangeable cations in between layers of a water swelling clay mineral (hereafter referred to as a clay mineral) with quaternary ammonium salt type organic cations by means of the cation exchange. Another known gelation method uses a gelation agent obtained by treating the organic modified clay mineral with a compound lipid instead of the nonionic surfactant.
However, a gelation method using the aforementioned gelation agent requires that the nonionic surfactant and the compound lipid have to be selected for each oil component to be used to obtain gel with good stability and usability because the structure of the obtained gel is significantly different depending on the oil component used.
Also, gels which can maintain sufficient stability tend to spread poorly at the time of application and exhibit poor usability.
Based on the aforementioned problem, the inventors conducted earnest research and discovered that a gelation agent obtained by mixing a water swelling clay mineral with a quaternary ammonium salt type cation surfactant and a fatty acid which is liquid at normal temperatures can provide an oil based gel with superior stability, safety and usability when used with a wide range of oil components, thus completing the present invention.
Furthermore, the inventors discovered that a gelation agent obtained by mixing a water swelling clay mineral with a quaternary ammonium salt type cation surfactant and a higher alcohol which is liquid at normal temperatures can provide an oil based gel with superior stability, safety and usability when used with a wide range of oil components, thus completing the present invention.
The object of the present invention is to provide a gelation agent which can be added and mixed to a wide range of oils to produce an oil based gel with superior stability, safety and usability, as well as a gel composition which uses this gelation agent.
Conventionally, a lipophilic surfactant with a HLB value of 1-12, e.g. polyhydric alcohol fatty acid ester type surfactants such as glycerine fatty acid esters and sorbitan fatty acid esters have been used for the emulsifying agent to obtain a W/O type emulsified composition.
Examples of emulsifying agents which can stably emulsify a wide range of oils include an emulsifying agent composition comprising an organic modified clay mineral and a nonionic surfactant as disclosed in Japanese unexamined patent publication Tokkai Sho 61-129033, and examples of emulsifying agent compositions which can stably emulsify silicon oil, which is hard to emulsify, include a combination of an organic modified clay mineral and a polyoxyalkylene modified organo polysiloxane as disclosed in Tokkai Sho 61-212321.
However, with the aforementioned emulsifying agents, the type of the emulsifying agent has to be selected according to each oil to be used in order to obtain an emulsified composition with good stability and usability.
Also, a large quantity of the emulsifying agent is required to emulsify a large quantity of polar oil and the use of a large quantity of the emulsifying agent sometimes affects the stability and usability of the emulsified composition.
Based on the aforementioned problem, the inventors conducted earnest research and discovered that an emulsifying agent obtained by mixing a water swelling clay mineral with a quaternary ammonium salt type cation surfactant and a fatty acid which is liquid at normal temperatures can provide an emulsified composition with superior stability, safety and usability when used with a wide range of oil components, thus completing the present invention.
Also, the inventors conducted earnest research and discovered that an emulsifying agent obtained by mixing a water swelling clay mineral with a quaternary ammonium salt type cation surfactant and a higher alcohol which is liquid at normal temperatures can provide an emulsified composition with superior stability, safety and usability when used with a wide range of oil components, thus completing the present invention.
The object of the present invention is to provide an emulsifying agent which can be added and mixed to a wide range of oils to produce a W/O type emulsified composition with superior stability, safety and usability, as well as a W/O type emulsified composition which uses this emulsifying agent.
A water-in-oil type emulsified composition (hereafter also referred to as a W/O type emulsified composition) has been used in sunscreen cosmetics because it makes a base agent with superior water resistance.
In general, a W/O type emulsified composition has a shortcoming in that a system with superior temperature stability and usability is difficult to obtain. An example of the technology which addresses this shortcoming is a W/O type emulsified composition obtained by treating a water swelling clay mineral with a quaternary ammonium salt type cation surfactant and a nonionic surfactant (Tokkai Sho 61-114721, Tokkai Sho 61-129033 and Tokkai Sho 61-212321).
Also known are a sunscreen cosmetic which is prepared by adding titanium oxide and/or zinc oxide, as the ultraviolet light protection agent, to a W/O type emulsified composition made with this technology, as well as technology which uses water repellent spindle-shaped titanium oxide to make the color of the ultraviolet light protection powder less conspicuous when applied (Tokkai Hei 7-258055).
However, the conventional sunscreen cosmetics which contain ultraviolet light protection powder have a problem in that the ultraviolet light protection powder becomes conspicuously white upon contact with sweat or water from the ocean or pool.
Shiseido Co., Ltd. application No. 62-30179 (hereinafter '179), published Feb. 9, 1987, discloses gelation agents for cosmetics prepared by treating swellable clay minerals with quaternary ammonium salt-type cationic surfactants and complex lipids. However, the '179 reference does not contain either a fatty acid which is liquid at normal temperature or a higher alcohol which is liquid at normal temperature, as in the gellation agent of the present invention. These two elements provide desired characteristics, and constitute important aspects of the present invention.
Based on the aforementioned problem, the inventors conducted earnest research to obtain a W/O type emulsified composition using the aforementioned organic modified clay mineral which does not become conspicuously white upon contact with water. The inventors discovered that this problem can be solved by using fatty acids or higher alcohols which are liquid at normal temperatures instead of the conventional nonionic surfactants, thus completing the present invention.
The object of the present invention is to provide a sunscreen co
Matsuzaki Fumiaki
Yanaki Toshio
Dodson Shelley A.
Shiseido Company Ltd.
Townsend & Banta
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