JPH0278606A - Manicure - Google Patents

Abstract

PURPOSE:To obtain a manicure having excellent properties such as luster, hardness, flexibility, water-resistance and sustained make-up effect containing lower alcohol containing a large amount of ethanol and L-type nitrocellulose as principal constituents. CONSTITUTION:Nitrocellulose of L-type (a cellulose derivative obtained by substituting hydroxyl group in natural cellulose nitrated by mixed acid to nitric acid group and the properties are able to be varied with the number of substituted to nitric acid group within three hydroxyl groups in six-membered ring of anhydrous glucopyranose group of cellulose) is used as principal agent of film formation and dissolved in volatile solvent composed of 2-4C lower alcohol containing >=80% ethanol, then plasticizer and resin, etc., of ethanol- soluble are suitably mixed, as necessary to obtain the aimed manicure. Said manicure is safe for human body even in use for a long period of time.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention has excellent properties such as gloss, hardness, flexibility, water resistance, and long-lasting make-up effect, and even after long-term use, It provides safe nail beauty products for people.

(Problems to be solved by conventional techniques and inventions) Conventional nail beauty products, mainly nail enamels that are applied to nails to give shine and emphasize the beauty of the nails, usually use H-type nitrocellulose as the film-forming main agent. A coloring material and the like are dispersed or dissolved as necessary in a system in which plasticizers and structural fats are appropriately blended and dissolved uniformly in a solvent as a volatile component. Volatile solvents include esters such as ethyl acetate, butyl acetate, butyl lactate, ketones such as methyl ethyl ketone and methyl isobutyl ketone, ethers such as ethylene glycol monoethyl ether, ethanol, isopropyl alcohol, n-butyl alcohol, etc. alcohols, and aromatic hydrocarbons such as toluene and xylene.

These are classified into three groups depending on their ability to dissolve nitrocellulose. It is a group of solvents called true or active solvents that have the ability to dissolve nitrocellulose (11).
2) A group called co-solvents or latent solvents, which do not have the ability to dissolve nitrocellulose by themselves, but when combined with a true solvent, increase the solvency and reduce the viscosity of the solution; (3) A group called diluents. This group has no ability to dissolve nitrocellulose, stabilizes the viscosity of the solution, and is involved in the melting of other resins. Among the volatile solvents mentioned above, esters, ketones, and ethers are classified as true solvents for nitrocellulose, and at least one of them is used in conventional nail polishes that use nitrocellulose as a film-forming main ingredient. It was essential to mix them together.

Further, alcohols are classified as co-solvents, and aromatic hydrocarbons are classified as diluents, and it is said that they cannot dissolve nitrocellulose either alone or in combination of two or more.

On the other hand, among these volatile solvents, esters.

Ketones, ethers, and aromatic hydrocarbons are all highly toxic to the human body when inhaled, and contact with them can have an adverse effect on the nails and surrounding skin, so the use of these solvents is considered problematic. was. Nevertheless, esters, ketones, which are true solvents for nitrocellulose,
Unless at least one selected from the group consisting of ethers is incorporated, it is not possible to provide a nail beauty product that uses nitrocellulose as a film-forming main ingredient, and a satisfactory solution has not yet been found. In addition, conventional enamel removers that use nitrocellulose as a film-forming agent to remove nail polish from nails are similar to enamel removers that use nitrocellulose as a true solvent as the main ingredient and contain large amounts of ketones and acetate esters. Met. For this reason, conventional enamel removers have strong inhalation toxicity, and at the same time remove excessive moisture and oil from the nails due to the degreasing and dehydrating effects of volatile solvents mainly composed of ketones and acetate esters. It has the disadvantage that it damages the surface of nails and makes nails whiter and more likely to break.

On the other hand, attempts have been made to provide nail polishes without using these esters, ketones, ethers, and aromatic hydrocarbons, but none of them use nitrocellulose as the main film-forming agent. It was not possible to form a film that was satisfactory in terms of water resistance, durability of the make-up effect, etc.

That is, in JP-A-54-20143, a half ester of alkyl vinyl ether/maleic anhydride copolymer is used as a film-forming main agent, and in JP-A-57-50,908, polyvinyl acetal lower dialkylamino acetate is used as a film-forming main agent and volatilized. Nail cosmetics containing an aliphatic lower alcohol as a solvent have been disclosed, but none of them were satisfactory in terms of the water resistance of the film formed and the sustainability of the makeup effect.

As a result of extensive research, we discovered that L-type nitrocellulose was used as the main agent for film formation, and after it was dissolved in a volatile solvent consisting of a lower alcohol with 2 to 4 carbon atoms containing 80% or more of ethanol, ethanol-soluble Nail beauty products obtained by appropriately blending plasticizers and resins are highly safe for the human body and contain conventional ester-based, ketone-based, ether-based, and aromatic hydrocarbon-based volatile solvents. The present invention was completed after discovering that it has excellent properties in use, similar to nail beauty products.

The present invention provides a nail beauty product containing L-type nitrocellulose and a lower alcohol having 2 to 4 carbon atoms as main components, wherein the ethanol content in the lower alcohol is 80% by weight or more. It is a nail polish.

The configuration of the present invention will be explained in detail below.

Nitrocellulose used in the present invention is a known substance, and is a cellulose derivative obtained by esterifying natural cellulose with a mixed acid and replacing the hydroxyl group (-OH) in cellulose with a nitric acid group (Nov>). Its properties can be changed depending on how many of the three hydroxyl groups in the six-membered ring of the anhydrous glucobylanose group are substituted with nitric acid groups.H-type nitrocellulose, which has been widely used in the past, has an average substitution Although the degree of substitution is in the range of 2.1 to 2.3 (7), L-type nitrocellulose can be obtained by substitution with an average degree of substitution of 1.9 to 2.1. The middle diamond shape and H shape are JIS
Shows the classification according to nitrogen bone defined by K6703-75, i.e. L-type nitro content 11.5% or more 12.2
% or less of cellulose.

Nitrocellulose with a nitrogen content of 1165% or more is
Ethanol, n-propyl alcohol, isopropyl alcohol, n-7'' alcohol.

When the nitrogen content is less than 10.7%, it cannot be dissolved transparently in isobutyl alcohol alone or in combination of two or more types, and it causes cloudiness, gelation, or precipitation, and cannot be used in the present invention. Certain nitrocelluloses are also undesirable for similar reasons.

As the L-type nitrocellulose in the present invention, commercially available products can be used, and the degree of polymerization is not particularly limited, but is usually about 40 to 450. Commercially available products include, for example, nitrified cotton LICI/8. LIG1/4. LICI/2 (manufactured by Asahi Kasei Industries) FQ type nitrified cotton SSI/8. SSI
/4, 331/2, 5S20 (manufactured by Daicel Chemical Industries, Ltd.), but the present invention is not limited to these products.

The amount of nitrocellulose (dry pure content) in the present invention is preferably in the range of 3 to 2 g% by weight based on the total amount of the nail beauty agent, and has a viscosity that makes it easy to apply to the nails and a thickness that provides a high makeup effect. In order to obtain a nail polish that forms a beautiful film, the range of 5 to 20% by weight is particularly preferable, and the blending amount is 3% by weight.
If it is less than 25% by weight, it will not be possible to form a film of sufficient thickness to give a makeup effect to the nails, and if it is more than 25% by weight, the solubility in volatile solvents will be exceeded, resulting in nitrocellulose precipitation or clouding. , which is undesirable because it causes phenomena such as gelation.

The volatile solvent used in the present invention consists of a lower alcohol having 2 to 4 carbon atoms containing 80% by weight or more of ethanol,
Considering safety to the human body, it is most preferable to use ethanol alone.

However, when ethanol is used alone as a volatile solvent, the drying speed is too fast, resulting in moisture brushing (a phenomenon in which moisture in the air condenses due to heat of evaporation and whitening of the film) and orange peel (a phenomenon in which the film whitens due to the condensation of moisture in the air due to the heat of evaporation). If unevenness on the film surface occurs due to evaporation, the evaporation rate can be adjusted by adding isopropyl alcohol, n-butanol, etc., which are aliphatic lower alcohols with higher boiling points. . However, in this case, the amount of aliphatic lower alcohol other than ethanol is limited to 20% by weight based on the total amount of volatile solvent, and if it is added in excess of this, nitrocellulose cannot be dissolved transparently. Unable to form a uniform and strong film. uniform,
In order to form a film with high hardness and transparency, it is particularly preferable that the amount of the aliphatic lower alcohol other than ethanol is less than 10% by weight.

On the other hand, nitrocellulose is easily ignitable in a dry state, and when ignited, it burns very rapidly and is dangerous, so commercially available products are usually provided in a state moistened with 30% by weight of isopropyl alcohol. ing. Therefore, if commercially available nitrocellulose is blended as is, 30% by weight of isopropyl alcohol will also be mixed in with 70% by weight of nitrocellulose (dry).

In the nail polish of the present invention, as the amount of aliphatic lower alcohol other than ethanol increases in the volatile solvent mainly composed of ethanol, the dissolving power of the volatile solvent for nitrocellulose decreases. When dissolving a large amount of nitrocellulose, it is desirable to reduce the amount of aliphatic lower alcohol other than ethanol to the extent that can prevent moisture brushing and orange peel. It is desirable to reduce the moistening isopropyl alcohol to 15% by weight or less by drying or other methods.In order to obtain a beautiful nail polish that does not contain any volatile or solvent other than ethanol, be extremely careful ( Another method is to dry nitrocellulose to remove isopropyl alcohol by a non-hazardous method and then immediately dissolve it in ethanol.

Conventionally, nail polishes that use nitrocellulose as a film-forming main ingredient have used plasticizers to prevent the film from cracking. Of these, there is no problem in blending them as long as they dissolve in ethanol or are uniformly miscible with it. Examples of plasticizers that can be incorporated in the present invention include camphor, dibutyl phthalate, acetyltributyl citrate, and the like.

In addition, conventional nail polishes that use nitrocellulose as the main film-forming agent contain resins to improve the gloss, shrinkage, adhesion, etc. of the nitrocellulose film.
In the nail beauty preparation of the present invention, any material that dissolves in ethanol and has +IN properties with nitrocellulose can be blended.

Examples of resins that can be blended in the present invention include shellac.

, Danmar, toluenesulfonamide formaldehyde resin, polyvinyl butyral, acrylic ester/methacrylic ester copolymer, acrylic acid/styrene copolymer, alcohol-soluble rosin-modified maleic ester resin, castor oil-modified cyclohexane polyester resin, shake Examples include rose acetate isobutyrate.

The amount of the volatile solvent consisting of a low heavy alcohol having 2 to 4 carbon atoms used in the present invention is determined by the amount of nitrocellulose, resins, plasticizers, pigments, etc., but usually,
Desirably 60 to 90% by weight based on the total amount of nail polish, 60
Less than % by weight, relatively nitrocellulose, resins,
Since the amount of I ingredients etc. increases, the viscosity increases, making it difficult to apply to the nails. If it exceeds 90% by weight, the amount of nitrocellulose and resin to be blended will be relatively small, making it impossible to form a film of sufficient thickness to provide a makeup effect to the nails.

(Examples) The present invention will be explained in more detail with reference to Examples below, but the technical scope of the present invention is not limited by these Examples. The blending amount is in weight%. The amount of nitrocellulose blended is shown in dry pure content.

Gloss, hardness, and flexibility of the nail polish shown in Examples.

The test methods for water resistance, durability of makeup effect, and degree of nail damage are as follows.

Apply the sample uniformly to a thickness of 80μ on a glossy glass plate and heat at 30°C.
After drying for 24 hours at
Reflectance measured at ℃ 0 reflectance of 90% or more is 0.
90 to 70% was rated △, and 70% or less was rated ×.

(2) Apply the sample uniformly to a hardness glass plate with a thickness of 80μ, and heat it at 30°C.
After drying for 24 hours, JI35400 "Paint - Ship Testing Method"
The hardness was measured using a pencil hardness meter according to . Load 300g Angle 4
Those with a pencil hardness of 2H or higher that can cause scratches on the film at 5°C are O, those between H and HB are Δ, and those below B are ×.
And so.

(3) A nylon plate coated with the sample to a thickness of 80μ in flexibility was
It was bent 180" once every day and the period (number of days) until cracking was measured. 0.2 to 4 days for 5 days or more, Δ, 1
Days or less were marked as ×.

(4) Water-resistant glass. Apply a sample uniformly to a thickness of 80μ and heat it at 30°C.
After drying for 24 hours, the glass plate was placed in water at 40℃ for 1 hour.
Whitening and swelling after soaking for a while.

The degree of peeling was visually observed. Ol something that doesn't change at all
A sample with slight whitening was graded △, and a sample with significant whitening or a coating that swelled and peeled off from the glass plate was graded x.

(5) Sustainability of make-up effect Samples were applied to the nails of 10 female subjects, and the gloss of the film and scratches on the peeled surface were observed every day to see if the make-up effect of the sample would be maintained in daily life. Determine how many days it will last.

If the effect lasted for 3 days or more in 8 or more subjects, 0.3 to 7 subjects was rated Δ, and if it was 2 or fewer subjects, it was rated ×.

(6) Degree of damage to nails Ten female test subjects used the sample for three months, and changes such as whitening and cracking of the nails were observed.

If none of the subjects were confused by the change in the nails, it was marked as ○, and if one or more subjects felt that the nails had changed, it was marked as ×.

As for the enamel remover, a commercially available product was used for the H-type nitrocellulose sample of the comparative example, and ethanol was used for the other samples.

(Manufacturing method) The prescription is shown in Table 1.

After uniformly mixing ① to ①, ① to ① and @ to ＠ were added and dissolved. Next, [phase], ① and O were added and mixed uniformly to obtain a nail polish.

(Characteristics) Table 2 shows the evaluation results for each item of the nail beauty products of Examples 1 to 5 and Comparative Examples 1 to 4.

Examples 1 to 5 are gloss, hardness, flexibility, and water resistance.

The product exhibited excellent product characteristics in terms of durability of makeup effect, and was highly safe and did not affect the nails even after continuous use for 3 months.

In Comparative Example I, the nitrocellulose was not completely dissolved in the volatile solvent and precipitated, so that a nail beauty product could not be obtained and could not be evaluated.

Comparative Example 2 uses 9.9% ethyl acetate as the solvent. Butyl acetate.

Using toluene, it has gloss, hardness, flexibility, water resistance,
Although this product has an excellent long-lasting makeup effect, when used continuously for 3 months, some test subjects were concerned about whitening and cracking of their nails, which made them unsatisfactory.

Comparative Example 3 does not contain nitrocellulose as the main film-forming agent, so it does not affect the nails even if used continuously for 3 months, but it is satisfactory in terms of water resistance and sustainability of the makeup effect. It was nothing.

Comparative Example 4 has gloss, hardness, flexibility, and water resistance because it does not contain 80% or more of ethanol in a volatile solvent consisting of a lower alcohol having 2 to 4 carbon atoms.

The durability of the makeup effect was not satisfactory.

(Effects of the Invention) As described above, the present invention is excellent in gloss, hardness, flexibility, water resistance, and durability of makeup effect,
Moreover, it is clear that a useful nail beauty preparation with excellent safety can be provided without using a solvent such as ethyl acetate, butyl acetate, or toluene.

Claims (1)

[Claims] A nail beauty product containing L-type nitrocellulose and a lower alcohol having 2 to 4 carbon atoms as main components, characterized in that the ethanol content in the lower alcohol is 80% by weight or more. .