JPS6333847B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to stain-resistant cosmetic tools, particularly stain-resistant cosmetic tools made of cellular rubber such as foam rubber, and a method for producing the same.

[Conventional technology]

Cosmetic tools made of cellular rubber (for example, cosmetic applicators such as puffs, makeup remover tips, pine surgery tools, etc. made of foam rubber) become dirty as they are used. Some of this dirt can be removed by washing with soap, but it gradually turns dark and becomes difficult to remove. For this reason, conventionally, cosmetic tools are colored in advance to make the dirt less noticeable. For example, many cosmetic applicator puffs are colored to match the skin color.

[Problem that the invention seeks to solve]

The present invention is an attempt to solve the above-mentioned problem, that is, cosmetic tools become contaminated with dirt as they are used. In particular, products made of cellular rubber such as foam rubber, such as cosmetic applicators such as puffs, makeup remover chiefs, and pine surge sponges, are porous and allow dirt to penetrate into the interior of the product. There was a problem that the color changed quickly. However,
Since cosmetic tools are generally required to have a clean feel, it is extremely undesirable for such dirt to adhere and discoloration due to the nature of cosmetic tools.

According to research conducted by the inventor of the present invention, there are various possible causes for the formation of dark stains on cosmetic tools that cannot be removed even when washed with soap. The main cause seems to be that small and colored metals seep into cosmetic tools and form complex bonds with the molecules of the cosmetic tools.

Such metals may include copper, nickel, cobalt, iron, manganese, chromium, vanadium, strontium, yttrium, zircon, niobium, or molybdenum, or alloys of these metals.

In particular, copper, copper oxide, and copper alloys such as brass or bronze easily react with vulcanization accelerators used in cellular rubber, form complexes, and become colored. Moreover, these copper and copper alloys are used in coins (10 yen,
5 yen) and kitchen utensils, etc., and there are many opportunities to touch them with your hands. Therefore, for example, if you use a cosmetic tool made of cellular rubber with your hands in contact with copper or copper alloys, the metal ions attached to your hands will be incorporated into the molecular structure of the cosmetic tool, causing the cosmetic tool to discolor. This stain does not come off even after washing, and the product appears to remain discolored.

As a result of various studies, the inventors of the present invention have found that the component of rubber that chemically bonds with metal ions is mainly a vulcanization accelerator remaining in the rubber.

Therefore, an object of the present invention is to prevent chemical bonding between such a vulcanization accelerator and metal ions attached to cosmetic tools, and to provide cosmetic tools that are less likely to be contaminated.

Furthermore, it is an object of the present invention to provide a method for manufacturing such cosmetic tools that are less likely to be contaminated.

[Means for solving problems]

In the present invention, when an aqueous solution of 100 parts by weight of copper sulfate is applied, the color is compared with the color of the original cosmetic tool and is on the JIS L-0804 (1983) color chart 4 of the gray scale for discoloration and fading. Above [i.e. JIS Z-8730
(1980) whose color difference is less than 1.5±0.2 according to the Adams-Nitzkerson color difference equation]
The above objectives are achieved by means of a cosmetic tool.

The present invention is particularly effective in the case of cosmetic applicators made of cellular rubber.

In the method of the present invention, cosmetic tools are immersed in an aqueous solution containing an oxidizing bleach or in an aqueous solution of a strong acid, washed with water, dried, and then coated with an aqueous solution of 100 parts by weight of copper sulfate. Compared to the color of the original cosmetic tool, the color of
8730 (1980), the color difference according to the Adams-Nitzkerson color difference formula is less than 1.5±0.2].

[Effect]

According to the present invention, since a rubber cosmetic tool is treated with an oxidizing bleach or a strong acid, at least the vulcanization accelerator near the surface of the cosmetic tool is oxidized or decomposed, and a part of the decomposed product is eluted. , is in a chemically stable state. Therefore, the cosmetic tool of the present invention is unlikely to react with metal ions. Therefore, even when the cosmetic tool of the present invention is coated with an aqueous solution of 100 parts by weight of copper sulfate, it does not react with copper ions and hardly changes color, so compared to the color of the original cosmetic tool, it is JIS L. -0804 (1983) Has the property of having a color chart of 4 or more on the gray scale for discoloration and fading.

〔Example〕

Cosmetic tools in the present invention are not particularly limited, but mainly cosmetic tools made of cellular rubber are targeted, for example, cosmetic tools made of foam rubber.
There are cosmetic applicators such as puffs, makeup remover squares, sponges for pine surges, etc.

Vulcanization accelerators used in rubber products have traditionally been zinc salts of mercaptobenzothiazole,
Water-insoluble zinc salts such as zinc dimethyldiocarbamate, zinc diethyldiocarbamate, zinc dibutyldiocarbamate, zinc ethylphenyldithiocarbamate, zinc butylxanthate, or zinc isopropylxanthate; sodium salt of mercaptobenzothiazole , sodium dimethyldithiocarbamate, sodium diethyldithiocarbamate, sodium dibutyldithiocarbamate, or sodium salts that are easily soluble in water such as sodium isopropylene xanthate; tetramethylthiuram disulfide, dipentamethylenethiuram tetrasulfide, tetrabutyl Sulfides such as thiuram disulfide or dibutylxanthogen disulfide; or carbamates such as piperezine pentamethylene dicarbamate or pipecoline pipecolyldithiocarbamate are known.

According to the present invention, these vulcanization accelerators remaining in cosmetic tools can be washed away, decomposed and eluted, or decomposed and made into a chemically stable state to form chelates with metal ions. to prevent

In the present invention, an aqueous solution of an oxidizing bleach (peroxide or chlorine compound), an aqueous solution of a peroxide and an alkali metal hydroxide, a combination of an oxidizing bleach (peroxide or a chlorine compound) and a strong acid or a weak acid are used. The target cosmetic tool is immersed in an aqueous solution such as a strong acid aqueous solution or a strong acid aqueous solution, and the vulcanization accelerator in the cosmetic tool is decomposed or eluted. The bath ratio of the object to be treated and the treatment liquid during immersion is about 30 to 100 times the amount of the object to be treated 1, preferably about 50 times.

Examples of the oxidizing bleach used in the present invention include sodium peroxide, hydrogen peroxide, peracetic acid, peracetic acid, perboric acid, sodium perborate, potassium percarbonate, persuccinic acid, sodium persuccinate, potassium permanganate, These include ozone, persulfuric acid, potassium persulfate, sodium persulfate, bleaching powder, sodium chlorite, sodium hypochlorite, chloramic acid, and sodium chloramate.

Further, as the alkali metal hydroxide, caustic soda, caustic potash, lithium hydroxide, calcium hydroxide, strontium hydroxide, sodium silicate, etc. can be used.

Examples of acids include hydrochloric acid, sulfuric acid, formic acid, acetic acid, oxalic acid,
Tartaric acid etc. are used.

When using an aqueous solution of peroxide alone, relatively good results can be obtained with any of the above-mentioned peroxides, but particularly good results are obtained with sodium peroxide and potassium peroxide.

Further, when peroxide such as hydrogen peroxide is used, a concentration of about 0.5% to 10% is appropriate, preferably about 2% to 3%. Also, when the concentration is low, the immersion time may be longer than when the concentration is high.

In the case of chlorine compound bleaching agents, a suitable concentration is about 0.2% to 6%, preferably about 1% to 2%.

Combinations of peroxide and alkali metal hydroxide are not particularly limited, but include, for example, hydrogen peroxide and caustic soda or sodium silicate, sodium peroxide and caustic soda, sodium perborate and caustic soda, sodium persuccinate and caustic soda, sodium persulfate and caustic soda, etc. The combination was good.

The combination of peroxide and acid is not particularly limited either, but for example, hydrogen peroxide, hydrochloric acid or acetic acid, peracetic acid, acetic acid or hydrochloric acid, perboric acid, hydrochloric acid or acetic acid, persuccinic acid, hydrochloric acid or acetic acid, persulfuric acid, Combinations such as hydrochloric acid or sulfuric acid were good. In the case of these combinations, the immersion time may be relatively short.

Good combinations of chlorine compound bleach and acid include, for example, sodium chlorite, hydrochloric acid or acetic acid, sodium hypochlorite, hydrochloric acid or acetic acid, bleaching powder, and hydrochloric acid or acetic acid. However, if you use chlorine bleach, the smell may remain, so wash thoroughly after soaking.

The above-mentioned alkali metal hydroxide and acid are used to adjust the pH so that the combined peroxide or chlorine compound bleach acts more effectively or for a longer time.

Moreover, in the case of an aqueous solution of an acid alone, it is preferable to use a strong acid such as hydrochloric acid or sulfuric acid. In this case, the concentration is
The range should be about 7% to 18%, preferably 10% to 15%.
%.

When cosmetic tools are treated with an aqueous solution containing a peroxide as described above, the vulcanization accelerator remaining in the cosmetic tools may be decomposed and eluted, or become chemically stable, resulting in the product being unobtainable. Cosmetic utensils that have been used will be in a state where they are less likely to discolor even when exposed to metal ions.

The cosmetic tool of the present invention has a color when an aqueous solution of 100 parts by weight of copper sulfate is applied, which is on the JIS L-0804 (1983) gray scale for discoloration and fading compared to the color of the original cosmetic tool. Color chart 4 or more [i.e. JIS Z-
8730 (1980), the color difference of the VxVyVz system according to the Adams-Nitzkerson color difference equation is less than 1.5±0.2].

Whether or not it is a cosmetic tool of the present invention can be confirmed as follows.

Dip a cosmetic tool into an aqueous solution of 100 PPM (100 parts per million) of copper sulfate, or add a few drops of the aqueous solution to the cosmetic tool and let it soak in well. In this way, the color when an aqueous solution of copper sulfate is applied and the color of the original cosmetic tool are determined according to JIS L-0804 (1983).
Compare using grayscale for discoloration and fading.

When a 100 PPM copper sulfate aqueous solution is applied to a conventional cosmetic tool, when compared with the color of the original cosmetic tool, it shows a color chart of 1 or 2 on the JIS L-0804 (1983) gray scale for discoloration and fading.

On the other hand, the stain-resistant cosmetic tools of the present invention have a color chart of 4 or more on the JIS L-0804 (1983) gray scale for discoloration and fading [i.e., JIS Z-8730 (1980)]
According to the Adams-Nitzkerson color difference formula of
VxVyVz color difference is less than 1.5±0.2]
becomes. Thus, it can be seen that the cosmetic tools of the present invention are extremely resistant to stains caused by metal ions.

In addition, if cosmetic tools are already contaminated with metal ions during the manufacturing process, use a metal ion eluent such as oxalic acid or ethylenediaminetetraacetic acid (EDTA) to elute the metal ions, and then proceed as described above. By applying stain-proofing treatment, you can obtain clean cosmetic tools.

Example 1 A cosmetic puff made by cutting latex foam rubber manufactured from NBR latex into a disc shape with a diameter of 60 mm and a thickness of 15 mm was prepared using hydrogen peroxide (35 mm).
The sample was immersed for 45 minutes at 65°C in an aqueous solution of 25g/% of an aqueous solution and 2.5g/aqueous solution of caustic soda, dehydrated, and then washed with distilled water. Thereafter, the product was dehydrated, washed with water, and dried to obtain the antifouling cosmetic puff of the present invention.

Next, in order to confirm the effect of the stain-proofing treatment, the cosmetic puff was immersed in an aqueous solution of 100 PPM (100 parts per million) of copper sulfate, and the hue was compared with that of a cosmetic puff that had not been immersed. . The degree of discoloration and fading is JIS
L-0840 (1983) Color chart for fading and fading was 4 or higher.

For comparison, a cosmetic puff that had not been soaked in the aqueous solution of hydrogen peroxide and caustic soda was soaked in the copper sulfate aqueous solution. In this case, the contamination was very large and was about 1 to 2 color scales of JIS L-0804 (1983) gray scale for discoloration and fading.

Example 2 NBR latex and SBR latex 1:1
Cosmetic puffs made by cutting the foam rubber manufactured from the latex mixed in the above into discs with a diameter of 60 mm and a thickness of 15 mm were immersed in an aqueous solution of 28 g of sodium perborate at 80°C for 1 hour to dehydrate them. After that, it was washed with water, and further washed with water whose pH was adjusted to 6 with oxalic acid. Then, the powder was dehydrated, washed with water, and dried to obtain the antifouling cosmetic puff of the present invention.

Next, in order to confirm the effect of the antifouling treatment, a small cylinder with an inner diameter of 10 mm was applied to a cosmetic puff, and 1 c.c. of a 100 PPM aqueous solution of copper sulfate was dropped into the small cylinder. An area of 10 mm in diameter was infiltrated on one side. The degree of discoloration and fading was JIS L-0804 (1983) color chart 4 or higher on the gray scale for discoloration and fading. When I rubbed this cosmetic puff with a copper coin, there was almost no discoloration.

For comparison, 1 c.c. of the 100 PPM copper sulfate aqueous solution was applied to one side of a cosmetic puff that had not been immersed in the sodium perborate aqueous solution to a diameter of 10 mm using the same method as described above.
permeated the area of The degree of contamination in this case is
It was JIS L-0804 (1983) color chart 2 or less on the gray scale for discoloration and fading.

Example 3 NBR latex LX-511 [product of Nippon Zeon Co., Ltd.] 150 parts by weight, potassium oleate 5 parts by weight,
4 parts by weight of ammonium stearate, 3.5 parts by weight of sulfur, 1.3 parts by weight of vulcanization accelerator EZ, 2 parts by weight of vulcanization accelerator MZ, 1.5 parts by weight of anti-aging agent SP, 2 parts by weight of trimene base, 1.2 parts by weight of diphenyl guanide. A mixture consisting of parts by weight, 8 parts by weight of soda silicofluoride, and 60 parts by weight of water was mixed in an oak mixer while blowing air into it, foaming it to 4 times its original size, discharging it, and casting it into a cylinder with a diameter of 60 mm. The foam rubber was then left to stand and was steam-vulcanized at 102°C for 45 minutes to produce foam rubber. This was cut into a disk shape with a thickness of 13 mm to make a cosmetic puff.

This cosmetic puff was immersed in an aqueous solution of 5 g of sodium perborate at 80° C. for 30 minutes, dehydrated, washed with water, dehydrated and dried to obtain a stain-resistant cosmetic puff of the present invention.

Next, in order to confirm the effect of the stain-proofing treatment, 1 c.c. of a 100 PPM aqueous solution of copper sulfate was infiltrated into an area of 10 mm in diameter on one side of the cosmetic puff. The degree of discoloration and fading was JIS L-0804 (1983) color chart 4 or higher on the gray scale for discoloration and fading. When this cosmetic puff was brought into contact with metallic copper for a long period of time, there was almost no discoloration.

Example 4 A cosmetic puff made of foam rubber made from a mixed latex of NBR latex and polyurethane latex was pretreated with 1.5 g of oxalic acid/
immersed in an aqueous solution, treated at 80℃ for 10 minutes, washed with water,
After dehydration, add 6 g of an aqueous solution of hydrogen peroxide (35%)/
After being immersed in an aqueous solution containing 2 g of caustic soda and an aqueous solution of 2 g of caustic soda for 30 minutes at 80°C and dehydrated,
Washed with distilled water. Thereafter, the product was dehydrated, washed with water, and dried to obtain a stain-resistant cosmetic puff of the present invention.

Next, in order to confirm the effect of the stain-proofing treatment, the cosmetic puff was immersed in a 100 PPM aqueous solution of copper sulfate, and then the hue was compared with a cosmetic puff that had not been immersed in 100 PPM copper sulfate. The degree of discoloration and fading of the cosmetic puff of this example was 4 or higher on the JIS L-0804 (1983) gray scale for discoloration and fading.

〔Effect of the invention〕

Conventional cosmetic tools have had the problem of stains soaking into them as they are used, but the cosmetic tools of the present invention do not darken even after long-term use. In particular, in the case of products made of cellular rubber such as foam rubber, with conventional products, dirt penetrates into the product due to its porous nature, resulting in immediate discoloration, but with the present invention, , foam rubber cosmetic tools will not discolor for a long time.

Conventionally, cosmetic tools were previously colored in a dark color to make dirt less noticeable, but the cosmetic tools of the present invention are less likely to change color due to dirt, so there is no need to color them in a dark color. Further, according to the present invention, since there is no need to change color, the cosmetic tools can be colored whitish or pale pastel colors, giving the cosmetic tools a luxurious feel.

According to the present invention, cosmetic tools that are resistant to staining and discoloration as described above can be obtained by a simple method of immersing the cosmetic tools in an aqueous solution containing an oxidizing bleach or a strong acid.

The method of the invention is easy to implement and relatively inexpensive to implement. Therefore, the cost of the product can also be kept relatively low.

Claims (1)

[Scope of Claims] 1. The color when an aqueous solution of 100 parts per million of copper sulfate is applied is different from the color of the original cosmetic tool.
The JIS L-0804 (1983) color chart for discoloration and fading gray scale must be 4 or more [i.e., the color difference according to the Adams-Nitzkerson color difference formula specified in JIS Z-8730 (1980) is less than 1.5 ± 0.2] Cosmetic tools with stain-proofing features. 2. A stain-resistant cosmetic tool according to claim 1, wherein the cosmetic tool is made of cellular rubber. 3. After immersing cosmetic tools in an aqueous solution containing an oxidizing bleach, drying and applying an aqueous solution of 100 parts per million of copper sulfate, the color of the product will be compared to the JIS color of the original cosmetic tool. L-0804 (1983) Gray scale color chart for discoloration and fading of 4 or more [i.e. JIS Z-8730
(1980) whose color difference is less than 1.5±0.2 according to the Adams-Nitzkerson color difference equation]
A method for producing stain-resistant cosmetic tools. 4. The method for producing stain-resistant cosmetic tools according to claim 3, wherein the oxidative bleaching agent is a peroxide bleaching agent. 5. The method for producing stain-resistant cosmetic tools according to claim 3, wherein the oxidizing bleach is a chlorine compound bleach. 6. The method for producing stain-resistant cosmetic tools according to any one of claims 3 to 5, wherein the aqueous solution containing an oxidizing bleach contains an alkali metal hydroxide. 7. Any one of claims 3 to 5, wherein the aqueous solution containing an oxidizing bleach contains an acid.
A method for producing stain-resistant cosmetic tools as described in 2. 8. After immersing cosmetic tools in an aqueous solution containing strong acids,
After washing with water and drying, the color when an aqueous solution of 100 parts by weight of copper sulfate is applied is compared to the color of the original cosmetic tool, and the color is JIS L-0804 (1983) gray scale color for discoloration and fading. 4 or more votes [i.e. JIS Z-8730
(1980) whose color difference is less than 1.5±0.2 according to the Adams-Nitzkerson color difference equation]
A method for producing stain-resistant cosmetic tools.