JPH0471052B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a novel film-type pack material, and its purpose is to provide a material that is excellent in stability over time, safety, and usability, and furthermore has improved drying properties. Conventionally, polyvinyl alcohol (hereinafter abbreviated as PVA) has been one of the typical raw materials widely used as a main film-forming agent in pack materials due to its excellent film properties and high safety to the skin. However, PVA is a synthetic polymer with a wide range of molecular weights, and has the characteristic that various performances including physical properties vary depending on the molecular weight. For example, 50,000 to 10
The viscosity range for use is 10,000 cps, but if one with a large molecular weight is used, the viscosity has no temperature dependence and a good pack that forms a strong film can be obtained, but on the other hand, the drying time is very long. On the other hand, if a material with a small molecular weight is used, the drying time may be shortened, but the strength of the film will be weak, and the dispersion system will become unstable, resulting in separation of powder and the like. Therefore, in practice, it is common to combine a large molecular weight compound with a small molecular weight compound, or to use a compound with an intermediate molecular weight.
In addition to the problem of applicability when using PVA alone, it has not been possible to obtain a product that is satisfactory in all aspects. On the other hand, various attempts have been made to improve the shortcomings in the process. For example, in order to increase viscosity, improve temperature dependence, and improve coating properties, carboxymethyl cellulose sodium (hereinafter referred to as sodium carboxymethylcellulose) is used as a gelling agent.
Water-soluble polymers such as CMC-Na (abbreviated as CMC-Na) and xanthan gum are added, but in this case, the drying time becomes longer than when PVA alone is used, and a sticky feeling occurs. Addition of alcohol, which promotes water volatilization, is effective in shortening this drying time, but adding too much alcohol may destabilize the dispersion system, causing separation and increasing irritation to the eyes and mouth area during use. However, it had the disadvantage of reducing usability. Therefore, as a result of extensive research in order to solve the above problems, the present inventor found that when PUA is combined with a water-soluble polymer and a specific microcrystalline cellulose as a gelling agent, a smaller amount of water-soluble polymer than before can be used. However, it has a remarkable thickening effect and excellent applicability, has low temperature dependence of viscosity, shortens drying time, and therefore allows the amount of alcohol added to be kept low, resulting in a highly safe pack material. This discovery has led to the completion of the present invention. The present invention relates to a film-type pack material which uses PVA as a main film-forming agent and blends a water-soluble polymer and CMC-Na coated microcrystalline cellulose therein. As the PVA applied to the present invention, those in the low to medium molecular weight range (for example, grades EG-05 to EG-30 manufactured by Nippon Gosei Kagaku Co., Ltd.) are more advantageously used. In addition, its content is as follows:
Depending on the grade used, the range is usually 5 to 15% by weight, more preferably 7 to 12% by weight based on the total weight of the pack. Next, water-soluble polymers include natural water-soluble polymers such as xanquat, xanthan gum, guar gum, locust bean gum, gum arabic, gum tragacanth, gum karaya, sodium alginate, sodium pectate, dextrin, methylcellulose, ethylcellulose, hydroxyethylcellulose, Semi-synthetic water-soluble polymers such as hydroxypropylcellulose, carboxyvinyl polymers,
Examples include synthetic water-soluble polymers such as polyvinylpyrrolidone and CMC-Na, and one or more of these may be selected and used. The important point here is the content, relative to the total weight of the pack.
It is effective to keep the content to 0.1% by weight or less. If an amount exceeding 0.1% by weight is used, that is, an amount conventionally blended, not only will the drying time be delayed, but it will also cause a sticky feeling. Usually 0.05 to 0.1% by weight, taking into account the effect of improving coating properties and the synergistic effect with CMC-Na coated microcrystalline cellulose.
A range of is preferred. Furthermore, microcrystalline cellulose is a microcrystalline powder of cellulose, and the structure maintains the cellulose structure as it is. This product is known as a gel-forming substance, and although the addition of this product can provide a certain degree of thickening effect, it is difficult to say that it is sufficient as a bulk pack material in view of the balance of various properties.
The CMC-Na coated microcrystalline cellulose used in the present invention is one in which the surface of microcrystalline cellulose is coated with CMC-Na (CMC-Na equivalent content 10 to 12%),
Surprisingly, in combination with PVA, its addition showed a remarkable thickening effect and shortened the drying time compared to the case where the water-soluble polymer CMC-Na and the coated microcrystalline cererose were added individually. We have obtained the knowledge that it does not delay the process and also improves the applicability. Commercially available products with such characteristics include, for example, Avicel RC (manufactured by FMC).
can be mentioned. The content thereof is selected from the range of 0.5 to 2.0% by weight based on the total weight of the pack, depending on the amount of the water-soluble polymer and its ratio to other components. Outside the above range, gelation may be insufficient or the weight increasing effect may be insufficient, resulting in little merit. As mentioned above, in the prescription system of packs,
The following are the characteristic effects of combining PVA, water-soluble polymer, and CMC-Na coated microcrystalline cellulose. 1. Stability over time (especially viscosity) is higher than that of PVA alone or in combination with PVA and a water-soluble polymer. 2.Compared to the case where the viscosity is increased using PVA alone (for example, by increasing the amount of PVA blended or using polymeric PVA), a product that has sufficient viscosity and is easy to apply can be obtained. 3. Because the amount of water-soluble polymer added is small, the amount of alcohol added is smaller than before (10% or less), and there is no irritation around the eyes or mouth, making it highly safe. 4. Since low to medium molecular weight PVA is used and the amount of water-soluble polymer added is small, drying time is shortened. In the present invention, in addition to the above-mentioned raw materials, raw materials commonly used in pack materials may also be blended in appropriate amounts within the scope of the purpose of the present invention. For example, powders include titanium oxide, silica, sericite,
Examples include kaolin, talc, zinc oxide, etc., and examples of cosmetic oils include hydrocarbons such as squalane, liquid paraffin, pristane, and vegetable oils such as olive oil and sesame oil. In addition, as a method for obtaining the pack material of the present invention,
Normal methods apply. That is, first, polyhydric alcohol, water-soluble polymer, CMC-Na coated microcrystalline cellulose, PVA, powder, etc. are dispersed and heated to dissolve in purified water, and purified water containing cosmetic oils, etc. is added and mixed. This can be accomplished through processes such as adding alcohol at the end. Here, Table 1 shows the test results of how effective the microcrystalline cellulose coated with CMC-Na of the present invention exhibits a thickening effect in combination with PVA. <Joint test sample> A PVA (EG-30) was dissolved in water at a ratio of 9% by weight. B Added 0.15% by weight of CMC-Na to A. CB end coating microcrystalline cellulose 1.35
wt% added. DA with 1.5% by weight of CMC-Na coating (11%) microcrystalline cellulose added.

[Table] As is clear from the results in Table 1, CMC-Na
It can be seen how the coating microcrystalline cellulose exhibits a thickening effect. Next, in order to evaluate the pack material of the present invention, a comparative evaluation test was conducted using Example 1 described later and Comparative Example 1 described later in which CMC-Na coated microcrystalline cellulose was not blended, using a temporal stability and usage test. . The results are shown in Table-2 and Table-3.

【table】

[Table] (Rating) Good: 10 points, Fair: 5 points, Bad 0 points Next, Examples and Comparative Examples are shown. Incidentally, each blending ratio is expressed in weight %. Example 1 A1.3-Butylene glycol xanthan gum CMC-Na coating microcrystalline cellulose titanium oxide PVA (EG-30) Polyvinyl acetate liquid 2.0 0.1 1.0 13.0 10.0 5.0 B [Polyoxyethylene polyoxypropylene glycol 2.0 C Stearate squalane mono Sorbitan oleate Polyoxyethylene sorbitan monostearate 0.5 5.0 0.5 1.0 D [Purified water 54.9 E [Ethanol 5.0 (Method) After mixing and heating a part of A and D, add B, and add C and D to this. After heating and mixing the remaining ingredients, add E and cool. Comparative Example 1 A1.3 Butylene Glycol Acid polyoxyethylene sorbitan 0.5 5.0 0.5 1.0 D [Purified water 54.9 E [Ethanol 5.0 (Method)] The same procedure as in Example 1 was carried out. Example 2 A1.3 Butylene glycol CMC-Na CMC-Na coating microcrystalline cellulose titanium oxide PVA (EG-5) Polyvinyl acetate liquid 2.0 0.05 2.0 12.0 12.0 5.0 B [Polyoxyethylene polyoxypropylene glycol 2.0 C Squalane stearate Sorbitan monooleate Polyoxyethyleson rubitan monostearate 0.5 5.0 0.5 1.0 D [Purified water 52.95 E [Ethanol 5.0 (Method)] The same procedure as in Example 1 was carried out. Example 3 A1.3-Butylene glycol xanthan gum CMC-Na coating microcrystalline cellulose titanium oxide PVA (EG-40) Polyvinyl acetate liquid 2.0 0.1 1.5 13.0 7.0 5.0 B [Polyoxyethylene polyoxypropylene glycol 2.0 C Stearate squalane mono Sorbitan oleate Polyoxyethylenesonbitan monostearate 0.5 5.0 0.5 1.0 D [Purified water 57.4 E] Ethanol 5.0 (Method) The same procedure as in Example 1 was carried out.

Claims (1)

[Claims] 1. Polyvinyl alcohol is used as a film-forming main agent,
This film-type pack is made by blending water-soluble polymer and carboxymethyl cellulose sodium coated microcrystalline cellulose. 2. The film-type pack according to claim 1, wherein the content of polyvinyl alcohol is 5 to 15% by weight based on the total weight of the pack. 3. The film-type pack according to claim 1, wherein the content of the water-soluble polymer is 0.05 to 0.1% by weight based on the total weight of the pack. 4. Sodium carboxymethyl cellulose coating The film-type pack according to claim 1, wherein the content of microcrystalline cellulose is 0.5 to 2% by weight based on the total weight of the pack.