JPH11130665A - Sheet-like pack agent composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a uniform sheet-like pack agent composition with long applicable time to release film when a sheet-like pack is produced, excellent in applicability and capable of easily shortening after applied. SOLUTION: This sheet-like pack agent composition comprises a crosslinking type hydrous gel including a poly(meth)arylic acid, water and a crosslinking agent, wherein, as the crosslinking agent, a dry aluminum hydroxide gel with an average particle size of <=10 μm is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for use as a pack, a poultice, a cosmetic pack, etc., for a sheet-like pack which is used by sticking to the body, face, etc. And a pack composition that can be used.

[0002]

2. Description of the Related Art A variety of face sheet packs have been proposed in which a pack composition containing various skin ingredients such as oil and moisturizer is impregnated or coated on a base cloth such as a nonwoven fabric. ing. These sheet-like packs are to be adhered from under the eyes to around the outer corner of the eyes in order to improve the bulk of the skin, fine wrinkles, bears, dullness, etc. It is formed by impregnating or applying a cross-linked hydrogel containing a water-soluble polymer compound, a cross-linking agent for a water-soluble polymer compound, an oil component, a humectant, and the like. As preferred water-soluble polymer compounds, various poly (meth) acrylates such as poly (meth) acrylic acid and poly (meth) acrylate are proposed, and these are usually crosslinking agents such as polyvalent metal salts. As a crosslinked product.

Examples of the polyvalent metal salt serving as a cross-linking agent such as poly (meth) acrylic acid and / or poly (meth) acrylate include calcium chloride, magnesium chloride, aluminum chloride, potassium alum, ammonium amber, and the like. Water-soluble salts such as iron lime van, aluminum sulfate, ferric sulfate, magnesium sulfate, calcium hydroxide, ferric hydroxide,
Aluminum, calcium carbonate, magnesium carbonate, calcium phosphate, magnesium stearate, aluminum stearate, calcium citrate, barium sulfate, barium hydroxide, aluminum allantoinate, aluminum acetate, bismuth hyponitrate, bismuth hypogallate, etc. Various polyvalent metal salts such as soluble or slightly soluble salts in water are known.

[0004]

SUMMARY OF THE INVENTION Generally, poly (meth)
The cross-linking reaction between acrylic acid or poly (meth) acrylate and the polyvalent metal salt is rapid, and the reaction occurs simultaneously with the addition of the metal salt (especially in the case of a soluble metal salt). There is a problem that a uniform cross-linked gel is generated or the viscosity increases during application of the gel composition on the release film, resulting in extremely poor operability. For this reason, in the metal crosslinking, an extremely thin aqueous solution of a metal salt is gradually added (JP-A-49-35523), or a complex salt with a polyvalent metal salt is formed with ethylenediaminetetraacetic acid or the like (JP-A-54-70241).
However, there are limitations on the control of gel uniformity, crosslinking rate and degree of crosslinking. On the other hand, there is a method of using a sparingly soluble polyvalent metal salt to slow the crosslinking rate (Japanese Patent Application Laid-Open No. 57-42617). In this case, the gel becomes uniform but the crosslinking rate becomes slow, and the aging time is long. If the amount of the cross-linking agent is increased to accelerate cross-linking, the solidification of the gel will occur due to excessive progress of the cross-linking over time, and in extreme cases, water will be released and the stability will be problematic. Occurs. Further, a method using a water-soluble polyvalent metal salt and a sparingly soluble polyvalent metal salt (JP-A-63-150222), a complex salt-forming agent such as ethylenediaminetetraacetic acid, and a complex salt formed thereby having a different degree of stabilization from each other. There is a method in which two or more polyvalent metal salts are used and the rate of crosslinking is controlled by metal ion exchange based on the difference in the degree of stabilization of the complex salt (JP-A-59-110614). I'm sorry. Therefore, an object of the present invention is to make it possible to easily apply a release film to a release film for a long time, to provide good coatability, and to shorten the aging time after coating when manufacturing a sheet-like pack. To provide a uniform sheet-shaped pack composition.

[0005]

In view of such circumstances,
As a result of intensive studies, the present inventors have found that the use of a dry aluminum hydroxide gel having an average particle size of 10 μm or less as a crosslinking agent for poly (meth) acrylic acids allows the pack composition to be applied to the base fabric. The present invention has been found to improve the coating properties, shorten the aging time after coating, and obtain a uniform gel, and have completed the present invention. That is, the present invention relates to a sheet-like pack composition comprising a crosslinked hydrogel containing poly (meth) acrylic acid, water and a crosslinking agent, wherein a dry aluminum hydroxide gel having an average particle size of 10 μm or less is used as a crosslinking agent. It is characterized in that it is used. In the present invention, poly (meth) acrylic acids are homopolymers and copolymers of (meth) acrylic acid, homopolymers and copolymers of (meth) acrylate, copolymers of (meth) acrylic acid and (meth) acrylate And partially neutralized products thereof, and mixtures of these polymers. Here, (meth) acrylic acid means acrylic acid or methacrylic acid. Poly (meta)
The type of the acrylate salt is not particularly limited, but usually a sodium salt is used.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The material constituting the base fabric of the sheet-like pack of the present invention is not particularly limited, and is usually a sheet-like material such as knitted fabrics such as flannel or sufmos, woven fabrics, various non-woven fabrics, paper and plastics. Any material used for the pack can be used.

In the present invention, these poly (meth) acrylic acids may be used in combination with other water-soluble polymer compounds. Examples of the water-soluble polymer compound used in combination with poly (meth) acrylic acids include gelatin, pectin, sodium alginate, polyvinyl alcohol, polyvinylpyrrolidone, polyvinylcarboxy copolymer, polyvinylpyrrolidone / vinyl acetate copolymer, and polyethylene oxide. , Carboxymethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, methylcellulose, ethylcellulose, xanthan gum, gum arabic, tragacanth gum, karaya gum, methoxyethylene and maleic anhydride copolymers, and the like. Any water-soluble polymer substance can be used. These can be used alone or in combination of two or more. The compounding amount of the water-soluble polymer compound containing poly (meth) acrylic acid is preferably 1 to 30% by weight, particularly preferably 2 to 15% by weight of the whole composition.

In the present invention, a dry aluminum hydroxide gel having an average particle size of 10 μm or less is used as a crosslinking agent for poly (meth) acrylic acids. In general, the reaction rate between aluminum hydroxide and poly (meth) acrylic acid is slow, and when aluminum hydroxide having an average particle size larger than 10 μm is used, the aging time is too long and productivity is greatly reduced. . However, when a dried aluminum hydroxide gel having an average particle size of 10 μm or less is used, the time for which the pack composition can be applied to the film is long, the coatability is good, and the aging after coating is performed. It has been found that the time can be reduced. In particular, when a dried aluminum hydroxide gel having an average particle size of 5 μm or less and a particle size range of substantially 10 μm or less is used, a pack composition having further improved properties can be obtained. When a polyvalent metal salt other than aluminum hydroxide gel is used as a cross-linking agent, a pack composition that simultaneously satisfies good coatability of the pack composition to the film and shortens the aging time after coating. It is difficult to get things. However, it is possible to use a cross-linking agent mixture containing a dried aluminum hydroxide gel having an average particle size of 10 μm or less as a main component and a small amount of another polyvalent metal salt as long as the properties of the above-mentioned sheet-like pack are not impaired. It is.

In the sheet-shaped pack composition of the present invention, the amount of the crosslinking agent used is not particularly limited, but is usually 0 to 1 equivalent of the crosslinkable site of the poly (meth) acrylic acid. It is preferably 0.01 to 5 equivalents, particularly preferably 0.1 to 2 equivalents. If the polyvalent metal salt is less than 0.05 equivalents, ion sequestration may occur and gelation may not occur. If the polyvalent metal salt is more than 5 equivalents, the degree of crosslinking may be too high to cause a water separation phenomenon.

Other active ingredients to be incorporated into the pack composition include, for example, methyl salicylate, glycol salicylate, indomethacin, l-menthol, peppermint oil, eucalyptus oil, dl-
Camphor pepper extract, nonyl acid ferry amide,
One or more of tocopherol acetate, diphenhydramine, chlorpheniramine maleate, thymol and the like are blended. In addition, any of various active substances for beautiful skin used in conventional cosmetics for cosmetic purposes can be blended, and humectants such as free amino acids, peptides, proteins, organic acids, urea, inorganic ions, polysaccharides such as hyaluronic acid, etc. And animal and plant extracts, vitamins and their derivatives, hydroxy acids and the like. This amount is generally from 0.01 to the total amount of the composition.
20% by weight is preferred.

[0011] In addition to the above components, the pack composition of the present invention may contain, if necessary, an oil component, an oily gelling agent, and propylene glycol, glycerin, sorbitol, and the like, which are generally used in packs. One or more humectants such as polyethylene glycol and sodium lactate (the amount is usually 5 to 30% by weight of the total composition); inorganic powders such as kaolin, talc, bentonite, titanium dioxide, zinc oxide, etc. One or two or more (the blending amount is usually 0 to 30% by weight of the whole composition); polybutene, an acrylic resin emulsion for the purpose of further adjusting the plaster physical properties (flexibility, tackiness, shape retention, etc.); A polymer compound such as a vinyl acetate resin emulsion can be blended. In addition, the pack composition of the present invention preferably contains water in an amount of usually 30% by weight or more, particularly preferably 40 to 80% by weight.

The pack composition of the present invention obtained by mixing the above components by a conventional method is impregnated or applied onto a base fabric such as a nonwoven fabric and, if necessary, is subjected to facing such as polyethylene film or polyethylene. The target sheet-like pack can be manufactured by applying a pack composition to a film such as a film and cutting the raw material formed by combining a nonwoven fabric into a predetermined size.

[0013]

Next, the present invention will be further described with reference to examples, but these examples do not limit the present invention. (Examples 1 to 3) A sheet-like pack was produced by applying a pack composition prepared according to the following formulation and manufacturing method on a nonwoven fabric base cloth. As the dried aluminum hydroxide gel in each example, those having the properties shown in Table 1 were used. The content in the composition is represented by% by weight.

[0014]

(Preparation method) Using a kneader, a part of the above components 1), 4), 5), 6) and 10) are blended uniformly, and after adding components 2), 3) and 7), the mixture is made uniform. After kneading, the rest of components 8), 9) and 10) were added, and the mixture was further uniformly kneaded to produce a pack composition.

(Comparative Examples 1 to 4) By applying a pack agent composition containing a crosslinking agent shown in Table 1 in place of the dried aluminum hydroxide gel 7) of the above example to a non-woven fabric base fabric, A sheet pack was produced. Table 1 shows the results of evaluating the coating properties and the aging speed when a sheet pack was manufactured using the pack compositions of these Examples and Comparative Examples.

[0017]

[Table 1]

The coatability in Table 1 was evaluated as follows. The coatable time was 2 days or more and the uniformity of the gel was very good. The coatable time was up to 2 days and the gel was uniform. Those having good properties were evaluated as ○, those having a coatable time of less than 1 day, and having a slightly non-uniform gel were rated as △, and those having a coatable time of several hours and having an uneven gel were rated as ×. As the evaluation of the aging rate, those having an aging time at 40 ° C. within 1 day were evaluated as ◎,
○ for 2-5 days, △ for 5 days or more, 1
Those that were 0 days or more were evaluated as x. The particle size of the aluminum hydroxide gel was measured by a microtrack method, and the particle sizes of other crosslinking agents were measured by a low tap method. From the results shown in Table 1, it is understood that the sheet-shaped pack composition of the present invention is excellent in both coating properties and aging speed.

Claims (1)

[Claims] 1. A sheet comprising a crosslinked hydrogel containing a poly (meth) acrylic acid, water and a crosslinking agent, wherein a dried aluminum hydroxide gel having an average particle size of 10 μm or less is used as the crosslinking agent. Pack composition.