JP2000143547A - Aqueous gel base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an aqueous gel base used in the field of cosmetics, quasi- drugs, medicines, etc., and suitable for direct application to skin by including a water-insoluble water absorbent resin having a specific average particle diameter and a specified water absorption ratio and water. SOLUTION: This base contains (A) a water-insoluble water absorbent resin having <=200 μm average particle diameter and >=50 times water absorption ratio based on the own weight in pure water (preferably a starch-acrylic salt graft copolymer and/or an acrylic salt copolymer) and (B) water. Furthermore, (C) 0.001-50 wt.% of an alcohol, (D) 0.001-20 wt.% of a UV absorber and (E) 0.001-20 wt.% of a pharmacodynamically effective ingredient can be contained in the base. The base can readily be prepared by mixing, e.g. the ingredient A with the ingredient C, then uniformly mixing the resultant mixture with other additives and water and placing the resultant uniform mixture in a container. The base can be placed in a container having <=1/10 transmittance of light or ultraviolet rays.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an aqueous gel base containing a water-insoluble water-absorbent resin, water and various additives.

[0002]

2. Description of the Related Art Conventionally, water-insoluble water-absorbing resins have been widely used in soil improvers, anti-condensation agents, cold storage materials, water-blocking agents for cables, drip absorbers, diapers, sanitary goods, etc. due to their high water-absorbing ability. ing. However, these methods of use are generally intended to absorb water in a water-insoluble water-absorbent resin, and are applied directly to human skin by pre-absorbing water or the like in a water-insoluble water-absorbent resin. Was not.

On the other hand, dosage forms such as lotions, emulsions, ointments, creams, etc. are widely used in the fields of cosmetics, quasi-drugs, and pharmaceuticals. There is a problem that it is difficult to apply to the thickness, and there is a problem that bases such as ointments and creams are uncomfortable about stickiness and cannot be easily removed.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art, and has as its object the direct use of cosmetics, quasi-drugs, pharmaceuticals and the like. It is an object of the present invention to provide an aqueous gel base suitable for application to the skin.

[0005]

Means for Solving the Problems In order to achieve the above object, the present inventors have intensively studied a gel composition containing a water-absorbing resin, and as a result, completed the present invention. That is, the present invention is an aqueous gel base having fluidity, comprising a water-insoluble water-absorbent resin and water, wherein the water-insoluble water-absorbent resin has an average particle diameter of 200 μm or less, and has an own weight. An aqueous gel base having a water absorption capacity of 50 times or more in pure water.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The aqueous gel base of the present invention has fluidity containing a water-insoluble water-absorbent resin and water, and is usually housed in a tube or a pump container, and is used in an appropriate amount. It is used by applying it to the skin (skin) as cosmetics, quasi-drugs or pharmaceuticals.

The water-insoluble water-absorbing resin used in the present invention is:
Average particle size is 200 μm or less, more preferably 100 μm
m, most preferably 50 μm or less. 200μ
The reason why the particle size of m or less is preferable is that the feel and elongation when directly applied to the skin are good, that it is easy to apply evenly, and that the particles remaining after the evaporation of moisture are so small as to be invisible, so there is no or little need to wash away. That is. The smaller the average particle diameter is, the more the tendency increases. The "average particle diameter" as used in the present invention is an average particle diameter when dried, and specifically, a loss on drying when 1 g of a water-insoluble absorbent resin is heated at a temperature of 105 ° C for 6 hours is 10% or less. It is the average particle size at a certain time.

The water-insoluble water-absorbent resin used in the present invention has a water absorption capacity in pure water of 50 times or more, more preferably 100 times or more, and most preferably 200 times or more of its own weight. The reason why the higher the water absorption ratio is, the better the reason is that the higher the water absorption ratio, the smaller the amount of addition of the water-insoluble water-absorbent resin, and the smaller the amount, the better the feel and elongation when directly applied to the skin, and the better the uniformity. That it is easy to apply, that the particles remaining after the evaporation of water are so small that they do not need to be washed out or are small, and that they can be manufactured at a low cost.

The water-insoluble water-absorbent resin used in the present invention is:
Any known resin can be used as long as it satisfies the above-mentioned particle size and water absorption ratio. , Acrylamide, cellulose graft copolymer obtained by graft polymerization of vinyl acetate, etc., or acrylic acid copolymer or acrylic acid copolymer such as resin made insoluble in water by crosslinking sodium acrylate with ethylene glycol diglycidyl ether. Coalescence. Of these, use of an acrylate copolymer or a starch / acrylate graft copolymer is particularly preferred. These water-insoluble water-absorbent resins are gelling bases, and are not sticky by being made water-insoluble in this way, and have a water retention function, and are used in the fields of cosmetics, quasi-drugs, pharmaceuticals, etc. Can be suitably used.

The aqueous gel base of the present invention contains various additives such as an alcohol, a UV absorber, a medicinal ingredient and a preservative according to the purpose.

The aqueous gel base of the present invention contains 0.001 to 50% by weight of alcohol, more preferably 0.01 to 2% by weight.
0% by weight, most preferably 0.1 to 10% by weight. The addition of alcohol assists in the evaporation of water from the skin when applied to the skin, and the rate of vaporization can be adjusted by adjusting the amount of addition. Examples of the alcohol include methanol, ethanol, propanol, isopropanol, butanol and the like. Ethanol is most preferable because of azeotropic distillation.

The aqueous gel base of the present invention contains a UV absorber in an amount of 0.001 to 20% by weight, more preferably 0.01 to 20% by weight.
10% by weight, most preferably 0.05 to 5.0% by weight. UV absorbers greatly contribute to the stability of the water-insoluble water-absorbent resin. The water-insoluble absorbent resin is
Since it is a crosslinked product, the crosslinking may be broken by light, particularly ultraviolet light. In order to prevent this, a UV absorber is blended. Examples of UV absorbers include salicylic acid, salicylates and derivatives thereof, p-aminobenzoic acid, p-aminobenzoates and derivatives, dihydroxybenzophenone,
Para-dimethylaminobenzoate and derivatives.

The aqueous gel base of the present invention contains 0.001 to 20% by weight, more preferably 0.01 to 20% by weight of the active ingredient.
10% by weight, most preferably 0.05 to 5.0% by weight. As medicinal ingredients, menthol,
Aromatherapy ingredients with herbal oils such as peppermint oil, chamomile oil, sage oil, aloe, hamamelis, thighs, plant extracts such as rhubarb, glycyrrhizin, horse oil, cosmetics,
Examples include quasi-drugs and components approved for use in pharmaceuticals.

Other additives include preservatives, antioxidants, fragrances, chelating agents, fats and oils, surfactants and the like. As preservatives, paraoxybenzoate,
Dehydroacetic acid, isopropylmethylphenol, benzalkonium, phenoxyethanol, hinokitiol,
Resorcinol, cetylpyridinium chloride, trichlorocarbanilide and the like.

The aqueous gel base of the present invention has a light or ultraviolet transmittance of 1/10 or less, more preferably 1/100.
It is preferable to be contained in the following container. As such a container, any known container can be used as long as the above-mentioned light transmittance can be achieved, and examples thereof include a container made of aluminum-deposited resin, a metal, a resin printed or kneaded with a light or UV absorbing compound. The shape is not limited as long as the object can be achieved. The water-insoluble absorbent resin has a crosslinking point that is easily destroyed by light or UV irradiation, and helps to improve stability by storing in a light-shielding container. in this case,
The addition of the UV absorber to the aqueous gel base and the light-shielding container may be used in combination.

The aqueous gel base of the present invention can be easily produced, for example, by uniformly mixing a water-insoluble absorbent resin, various additives and water, and placing the mixture in a container. In this case, it is preferable to mix the water-insoluble water-absorbent resin with alcohol in advance and then mix it with water, so that it is less likely to become mamako and can be suitably manufactured.

[0017]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited thereto.

Example 1 2 g of water-insoluble water-absorbing resin AquaKeep (manufactured by Sumitomo Seika Co., Ltd., sodium salt of acrylic acid polymer, water absorption ratio in pure water: 300 times, average particle diameter: 20 μm) was mixed with 10 g of ethanol. Was uniformly mixed with 88 g of water and placed in a light-shielding tube having a light transmittance of 1/100 or less to obtain an aqueous gel base.

EXAMPLE 2 2 g of a non-water-soluble water-absorbent resin AquaKeep (manufactured by Sumitomo Seika Co., Ltd., sodium salt of acrylic acid polymer, water absorption ratio in pure water: 300 times, average particle diameter: 20 μm), 2 g of ethanol, 10 g of ethanol and 0 g of dihydroxybenzophenone .1 g, then uniformly mixed with water (87.9 g) and placed in a resin tube to obtain an aqueous gel base.

When used, the aqueous gel bases obtained in Examples 1 and 2 become gel-like, have an appropriate viscosity, and further evaporate due to evaporation of water.
There was no need to wash it off, and it could be comfortably used as a cosmetic without soiling the skin and clothes.

Example 3 Water-insoluble water-absorbent resin sun wet (manufactured by Sanyo Kasei Kogyo Co., Ltd., starch acrylic acid graft copolymer, water absorption ratio 1000 times in pure water, average particle diameter 100 μm) 2
g, ethanol 10 g, isopropylmethylphenol 0.1 g, tea extraction extract 0.1 g, dihydroxybenzophenone 0.1 g, and water 87.7 g were uniformly mixed and placed in a resin tube to obtain an aqueous gel base.

The aqueous gel base obtained in Example 3 becomes a gel when used similarly to Examples 1 and 2,
The extract had an appropriate viscosity, and further evaporated due to the evaporation of water, so that the extract sufficiently spread to the skin and could be used comfortably as a quasi-drug.

[0023]

Since the aqueous gel base of the present invention is constituted as described above, it can be applied directly to the skin comfortably in the fields of cosmetics, quasi-drugs, pharmaceuticals and the like.

Continued on front page F term (reference) 4C076 AA09 BB31 DD37 EE09 EE38 EE50 FF35 4C083 AA112 AB052 AC101 AC102 AC212 AC472 AD091 AD092 AD241 AD242 CC02 DD41 DD47 EE06 EE07

Claims (6)

[Claims] 1. A flowable aqueous gel base comprising a water-insoluble water-absorbent resin and water, wherein the water-insoluble water-absorbent resin has an average particle diameter of 200 μm or less and a weight of 50%. An aqueous gel base having a water absorption capacity in pure water that is twice or more. 2. The aqueous gel base according to claim 1, wherein the water-insoluble water-absorbent resin is a starch / acrylate graft copolymer and / or an acrylate copolymer. 3. The aqueous gel base according to claim 1, wherein the aqueous gel base contains 0.001 to 50% by weight of an alcohol. 4. The aqueous gel base according to claim 1, which contains 0.001 to 20% by weight of a UV absorber. 5. The aqueous gel base according to claim 1, comprising 0.001 to 20% by weight of a pharmaceutically active ingredient. 6. The aqueous gel base according to claim 1, which is contained in a container having a light transmittance of 1/10 or less.