Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Web – sheet or filament bases; compositions of bandages; or...
Reexamination Certificate
1999-10-15
2002-10-01
Dees, Jose'G. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Web, sheet or filament bases; compositions of bandages; or...
C424S401000, C424S078030, C514S474000, C514S944000
Reexamination Certificate
active
06458379
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a sheet for whitening cosmetics and to a method for using the same. More particularly, it relates to a sheet for whitening cosmetics for alleviating or eliminating stains, freckles, non-transparency, etc. due to deposition of pigments or pigmentation on the surface of a skin and to a method for using such a sheet for whitening cosmetics.
DESCRIPTION OF THE RELATED ART
Cosmetics which exhibit various effects are commercially available. Among them, attention has been being increasingly paid to those cosmetics which exhibit an effect of causing a skin to look whiter, i.e., a so-called whitening effect. Stains, freckles, non-transparency, etc. once occurred on the skin, in particular, the skin of a face, are difficult to be eliminated. Many companies have developed preparations for preventing these symptoms and put them on the market.
It is generally believed that exposure of a skin to ultraviolet rays generates melanine pigment in the skin, which causes such a pigmentation. Therefore, whitening cosmetics which inhibit the generation of or remove the melanine pigments in the skin to prevent various symptoms attributable to the deposition of pigments have been developed and there have been various commercial products. Most of them are liquid or cream-like products.
However, cosmetics in the form of liquid or cream have the problems that the amount (dose) of the cosmetic applied to a skin surface is usually not constant, varying from site to site of application on the skin and it is difficult to efficiently apply the whitening component onto a skin surface and that the cosmetics are wiped off by contact with other things, e.g., hand, cloth, etc. Therefore, use of the cosmetics must be continued for a long time before they exhibit a satisfactory whitening effect.
Generally, cosmetics in the form of liquid or cream are applied with fingers and/or palms and therefore the cosmetics adhere to the fingers and/or palms of users. Therefore, it is often the case that their washing is necessary, which will be troublesome to most of the users.
SUMMARY OF THE INVENTION
That is, an object of the present invention is to provide a whitening cosmetic containing a whitening component of which it is easy to make the amount (dose) applied to a skin surface constant.
Another object of the present invention is to provide a whitening cosmetic which does not adhere to fingers and/or palms ofa user when applied to a skin surface with the fingers and/or palms.
Still another object of the present invention is to provide a whitening cosmetic which can be stored with ease and readily applied in a wet state to a skin surface upon use.
Yet another object of the present invention is to provide a method for using such whitening cosmetics as described above.
Accordingly, the present inventors have made extensive research with view to obviating the above-described problems and as a result, they have now found that the above-described objects can be attained by the provision of a sheet-like whitening cosmetic comprising a substrate in the form of a sheet having formed on a surface thereof an adhesive layer comprising a wet pressure-sensitive adhesive composition, which readily exhibits stickiness upon contact with or exposure to water or the like, i.e., thus completing the present invention.
That is, in a first aspect, the present invention provides a sheet for whitening cosmetics, comprising a sheet-like substrate and an adhesive layer comprising a wet pressure-sensitive adhesive composition formed on the substrate.
Here, the wet pressure-sensitive adhesive composition may comprise a water-soluble base material and a wetting agent.
The water-soluble base material may comprise a water-soluble polymer.
The water-soluble polymer may be at least one compound selected from the group consisting of polyvinylpyrrolidone, polyvinyl alcohol, sodium alginate, sodium polyacrylate, potassium polyacrylate, polyacrylamide, carboxymethylcellulose, gum Arabic, and polymethyl vinyl ether.
The wetting agent may be a polyhydric alcohol.
The polyhydric alcohol may be at least one compound selected from the group consisting of glycerin, sorbitol, polyethylene glycol, propylene glycol, polypropylene glycol, 1,3-propanediol, 1,4-butanediol.
The polyhydric alcohol is preferably glycerin.
The sheet-like substrate preferably has a water vapor permeability.
The sheet-like substrate may comprise a fabric or a laminate sheet of a fabric and a water vapor permeable plastic film.
The sheet-like substrate may comprise a fabric or a laminate sheet of a fabric and a water vapor permeable plastic film.
The sheet for whitening cosmetics may further comprise a separator provided on a surface of the adhesive layer opposite to the sheet-like substrate.
The whitening component may be at least one substance selected from the group consisting of vitamin C or its derivatives, vitamin E nicotinate, kojic acid, hydroquinone, ellagic acid, albumin, galenical extracts, and rice bran extracts.
The whitening component is preferably kojic acid or rice bran extracts.
The whitening component is preferably magnesium L-ascorbyl-2-phosphate.
The wet pressure-sensitive adhesive composition may be in a dry state.
The wet pressure-sensitive adhesive composition may be in a wet state after it has once been dried.
In a second aspect, the present invention provides a method for using a sheet for whitening cosmetics as described above, comprising the steps of:
contacting the sheet for whitening cosmetics with water and/or a hydrophilic medium prior; and
then applying the sheet to an application site on a surface of skin where application of the sheet is desired.
Here, the water and/or hydrophilic medium may be contacted with a surface of the adhesive layer of said whitening cosmetic sheet.
The water and/or hydrophilic medium may be contacted with the application site on a surface of skin where application of said sheet is desired.
The above and other objects, effects, features and advantages of the present invention will become more apparent from the following description of preferred embodiments.
DETAILED DESCRIPTION OF THE INVENTION
Here, the term “sheet for whitening cosmetics” is also referred to as “whitening cosmetic sheet.”
The wet pressure-sensitive adhesive composition used in the present invention is a composition which forms a film when an adhesive layer formed in the form of a sheet is applied to an application site and left to stand for a predetermined time to dry it. The composition is not limited particularly so long as it exhibits stickiness upon contact with a hydrophilic medium usually used in cosmetics, such as water, methanol, ethanol, or mixtures of these, coated or otherwise applied upon use. More specifically, a composition comprising a water-soluble base material such as water-soluble polymer and a wetting agent blended therein is used advantageously.
The water-soluble base material which can be used preferably includes polyvinylpyrrolidone, polyvinyl alcohol, sodium alginate, sodium polyacrylate, potassium polyacrylate, polyacrylamide, carboxymethylcellulose, gum Arabic, polymethyl vinyl ether, etc. Particularly preferred are polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acid salts (Na salt, K salt, etc.). The molecular weight of water-soluble polymer used as a water-soluble base material is not limited particularly so long as the above-described properties of wet pressure-sensitive adhesive composition can be exhibited but usually, a molecular weight in the range of from 50,000 to 2,000,000 is preferred. If the molecular weight is below 50, 000, the base material tends to remain on the skin surface while with a molecular weight of above 2,000,000, the viscosity of a solution of composition upon the production is too high so that it is frequently the case that production of the wet pressure-sensitive adhesive composition tends to be difficult.
The wetting agent which can be used in the present invention includes glycols such as glycerin, sorbitol, polyethylene glycol, propylene glycol, and
Kawasaki Takashi
Konno Masayuki
Dees Jose'G.
Kilyk & Bowersox P.L.L.C.
Nitto Denko Corporation
Williamson Michael A.
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