JPH0580958B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to an adhesion aid composition for adhering artificial nails, which is mainly used for beautifying and decorating fingernails. BACKGROUND TECHNOLOGY In recent years, it has become common for women, in particular, to lengthen their fingernails and shape them into beautiful shapes for beautification and decoration. Artificial nails made of synthetic resin molded into shapes have come into use.
Such artificial nails are used by adhering to natural nails with an adhesive, and because it is necessary to quickly obtain strong adhesive strength, so-called instant adhesives such as cyanoacrylate-based adhesives are generally used. Problems to be Solved by the Invention However, once the artificial nails are adhered, it is often difficult to peel them off, which poses problems when replacing or removing the artificial nails. Therefore, in addition to strong adhesive strength, adhesion with good releasability is required. In view of these circumstances, the present inventors have conducted various studies on bonding artificial nails that have strong adhesive strength and good releasability. As a result, the inventors discovered that the objective could be achieved by using a solvent solution of a certain kind of polymeric substance as an adhesion auxiliary agent, and were able to complete the present invention. Means for Solving the Problems The present invention uses lower alcohols and lower alcohols.
A solvent selected from the group consisting of hydrous lower alcohols and lower alkyl esters of acetic acid containing 80% by volume or more, and dispersed or dissolved in the solvent,
Based on the total weight of the composition, 3-70% by weight of rosin, copal, damalgam, shellac, formula:

[In the formula, R ¹ and R ² each independently have a carbon number of 1
~10 alkyl groups, R ³ , R ⁴ and R ⁵ are each independently hydrogen or a methyl group, T, U and V are
Each independently, 0 or an integer, provided that 10≦T+
U+V≦5000] Copolymer and formula represented by:

[Formula, R ⁶ is an alkyl group having 1 to 10 carbon atoms, R ⁷ is a lower alkyl group, R ⁸ , R ⁹ , R ¹⁰ , R ¹¹ and R ¹²
are each independently hydrogen or methyl group, W, X,
Y and Z are each independently 0 or an integer, provided that 10≦W+X+Y+Z≦5000. An adjuvant composition is provided. When using an artificial nail, the adhesion aid composition of the present invention is first applied to a natural nail. Then, by adhering the artificial nail using an adhesive such as a cyanoacrylate adhesive in a conventional manner, strong adhesive strength can be quickly obtained. Furthermore, by simply dropping ethanol around the adhesive part of the artificial nail and applying a slight stress, the artificial nail can be easily peeled off as desired. The lower alcohol used as a solvent in the composition of the present invention may have 1 to 5 carbon atoms, and includes, for example, methynol, ethanol, propanol, isopropanol, and the like. These lower alcohols may contain water, but from the viewpoint of dispersing or dissolving the polymeric substance, it is desirable that the lower alcohol concentration in the water-containing lower alcohol is 80% by volume or more. Examples of lower alkyl esters of acetic acid include alkyl esters having 1 to 5 carbon atoms, typically ethyl acetate. In the present invention,
The solvents may be used alone or in combination of two or more in an appropriate ratio. Rosin, copal, dammargum and shellac used as polymeric substances are all known natural polymeric substances, and commonly available ones can be used. The copolymers represented by the formulas [] and [] are
It can be obtained by copolymerizing predetermined acrylic monomers in a specific ratio, for example, according to a known solution polymerization method. Monomers used in the copolymer of formula [] include acrylic acid and methacrylic acid; methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl methacrylate,
Examples include alkyl acrylates and alkyl methacrylates such as 2-ethylhexyl acrylate and 2-ethylhexyl methacrylate. The weight composition ratio of the monomers in the copolymer of formula [] is 5 to 80% by weight of acrylic acid or methacrylic acid, preferably 25 to 50% by weight,
20-95% by weight of one or two acrylic esters or methacrylic esters, preferably
The content is preferably 50 to 75% by weight. Monomers used in the copolymer of formula [] include the same monomers as those for the copolymer of formula [], and hydroxy acrylates such as hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, and hydroxypropyl methacrylate. Alkyl and hydroxyalkyl methacrylates; include acryloxypropyltrialkoxysilanes and methacryloxypropyltrialkoxysilanes such as acryloxypropyltrimethoxysilane, methacryloxypropyltrimethoxysilane, methacryloxypropyltriethoxysilane. The weight composition ratio of the monomers in the copolymer of formula [] is 5 to 30% by weight of acrylic acid or methacrylic acid, preferably 10 to 30% by weight.
20% by weight, 20-60% by weight of acrylic ester or methacrylic ester, preferably 25-40% by weight, 20-60% by weight of hydroxyalkyl acrylate or hydroxyalkyl methacrylate, preferably 30-50% by weight, It is desirable that the amount of acryloxypropyltrialkoxysilane or methacryloxypropyltrialkoxysilane be 0.2 to 20% by weight, preferably 1 to 10% by weight. The weight average molecular weight of the copolymers of formulas [] and [] is preferably from several thousand to several hundred thousand. Examples of the solvent used during solution polymerization include methanol, ethanol, isopropanol, acetone, chloroform, and ethyl acetate. In addition, known radical-forming polymerization catalysts such as 2,
2'-azobisisobutyronitrile, 2,2'-azobis(4-methoxy-2,4-dimethylvaleronitrile), dimethyl 2,2'-azobisisobutyrate, 2,2'-azobis(2 , 4-dimethylvaleronitrile), benzoyl peroxide, diisopropyl perdicarbonate, t-butyl perisobutyrate, etc., and are preferably used in a proportion of 0.05 to 2% by weight based on the total weight of the monomers. The polymerization reaction is generally preferably carried out at a temperature of 50 to 100°C below the boiling point of the solvent. The obtained copolymer solution may be used as it is without being purified, or the copolymer may be isolated and purified. In the composition of the present invention, one or more polymeric substances selected from the above-mentioned natural polymeric substances and copolymers of formulas [] and [] are used. Based on the entire composition, the polymeric material has a content of 3 to 3.
70% by weight, preferably 10 to 30% by weight.
If it is less than 3% by weight, a film of sufficient thickness cannot be formed even when applied to natural nails, and removability when attaching and removing artificial nails becomes poor. On the other hand, if it exceeds 70% by weight, the composition becomes too viscous and difficult to apply. The composition of the present invention can be produced by dissolving or dispersing a polymer substance in a solvent according to a conventional method, and if desired, additives such as organic or inorganic colorants and fragrances may be appropriately added. Good too. To use the composition of the present invention, when attaching an artificial nail, it is first applied to a natural nail by an appropriate method and air-dried. Then, the artificial nail is adhered using a cyanoacrylate adhesive or the like in a conventional manner. Bonded artificial nails will not peel off even if immersed in cold water, hot water, detergent solution, etc. When attaching and detaching, the artificial nail can be easily separated from the natural nail by dropping ethanol around the adhesive part of the artificial nail and applying a slight stress. Effects of the Invention By using the composition of the present invention, it is possible to achieve the strong adhesive strength required when attaching artificial nails, as well as good releasability. EXAMPLES Next, the present invention will be described in more detail with reference to reference examples, examples, and comparative examples. Reference Example 1 A 30% ethanol solution consisting of 15 g of methacrylic acid, 20 g of methyl methacrylate, and 15 g of butyl methacrylate was prepared in a three-necked flask equipped with a thermometer, a reflux tube, and a nitrogen inlet tube, and the mixture was heated under a nitrogen stream for 1 to 2 hours. It was degassed by stirring for an hour. Next, 0.25 g of 2,2'-azobis(2,4-dimethylvaleronitrile) was added and polymerized at 60°C for 20 hours. Then, 0.2 g of a polymerization initiation catalyst was added and polymerization was continued at 78°C for 4 hours. conduct,
The reaction was completed. A colorless and transparent 20% copolymer (formula [], T:U:V=3:
4:3, R ¹ , R ³ , R ⁴ , R ⁵ = methyl, R ² = butyl, molecular weight 75000) solution was obtained. Reference Example 2 A 30% ethanol solution consisting of 5 g of methacrylic acid, 5 g of methyl methacrylate, 10 g of hydroxyethyl methacrylate, and 5 g of methacryloxypropyltrimethoxysilane was prepared in a three-necked flask equipped with a thermometer, reflux tube, and nitrogen inlet tube. The mixture was degassed by stirring for 1 to 2 hours under a nitrogen stream. Next 2,
After adding 0.25 g of 2'-azobis(2,4-dimethylvaleronitrile) and polymerizing at 60°C for 20 hours,
Further, 0.2 g of a polymerization catalyst was added and polymerization was carried out at 78° C. for 4 hours to complete the reaction. A colorless and transparent 20% copolymer (formula [], W:
A solution was obtained (X:Y:Z=1:1:2:1, ^R6 to ^R12 = methyl, molecular weight 50000). Example 1 3.0 g of copolymer of formula [] obtained in Reference Example 1
was dissolved in absolute ethanol to give a total amount of 10 g to obtain a desired adhesive composition for artificial nails. Example 2 2.0 g of copolymer of formula [ ] obtained in Reference Example 2
was dissolved in absolute ethanol to give a total amount of 10 g to obtain the desired composition. Example 3 2.0 g of copolymer of formula [] obtained in Reference Example 2
Dissolve 2.0g of rosin in 80% ethanol,
The desired composition is obtained with a total amount of 10 g. Example 4 0.5 g of copal resin was dissolved in anhydrous methanol,
The desired composition is obtained with a total amount of 10 g. Example 5 Dissolve 2.0 g of rosin in ethyl acetate and dilute the total amount to 10
The desired composition is obtained as g. Example 6 2.0g of Dharmal gum was dissolved in 90% ethanol,
The desired composition is obtained with a total amount of 10 g. Example 7 2.0 g of shellac is dissolved in absolute ethanol to give a total amount of 10 g to obtain the desired composition. Example 8 1.0 g of copolymer of formula [] obtained in Reference Example 1
and 1.5 g of dammar gum are dissolved in isopropanol to give a total amount of 10 g to obtain the desired composition. Comparative Example 1 0.2 g of copolymer of formula [] obtained in Reference Example 2
Dissolve in absolute ethanol to make a total amount of 10 g. Comparative Example 2 8 g of the copolymer of formula [] obtained in Reference Example 2 was dissolved in absolute ethanol to make the total amount 10 g. The compositions obtained in these Examples and Comparative Examples were each applied to the test subject's fingernails with a small brush, air-dried, and then applied using a cyanoacrylate adhesive.
Artificial nails made of methyl methacrylate resin were glued on.
Next, the test subjects were allowed to live their normal lives for 3 hours, and the presence or absence of peeling of the artificial nails during that time was examined. In addition, if the artificial nail did not peel off within 3 hours, ethanol was applied to the artificial nail adhesion site and the nail was peeled off by applying stress, and the ease of peeling was evaluated using the following criteria. A comprehensive evaluation of the ease of application of the composition was also conducted. Ease of peeling ○: Easy ×: Difficult Ease of application ○: Easy ×: Difficult Overall evaluation ○: Good ×: Poor The results are shown in Table 1. In addition, Table 1 also shows the results of evaluation of the following adhesion method as a comparison. Comparative Example 3 A cellulose acetate-water emulsion adhesive was applied to natural nails in advance, and after air drying, an artificial nail was adhered with a cyanoacrylate adhesive and evaluated in the same manner. Comparative Example 4 An artificial nail was directly adhered to a natural nail using a cyanoacrylate adhesive and evaluated in the same manner. Comparative Example 5 An artificial nail was adhered using only double-sided adhesive tape and evaluated in the same manner.

【table】

[Table] As shown in Table 1, by using the adhesion aid composition for artificial nails of the present invention, desirable adhesion of artificial nails can be achieved.

Claims (1)

[Claims] 1. Lower alcohol, 80% by volume of lower alcohol
A solvent selected from the group consisting of water-containing lower alcohols and lower alkyl esters of acetic acid, and 3 to 70% by weight of rosin, copal, dammargum, and shellac, based on the total weight of the composition, dispersed or dissolved in the solvent. , formula: [In the formula, R ¹ and R ² each independently have a carbon number of 1
~10 alkyl groups, R ³ , R ⁴ and R ⁵ are each independently hydrogen or a methyl group, T, U and V are
Each independently, 0 or an integer, provided that 10≦T+
[wherein R ⁶ is an alkyl group having 1 to 10 carbon atoms, R ⁷ is a lower alkyl group, R ⁸ , R ⁹ , R ¹⁰ , ^R11 and ^R12
are each independently hydrogen or methyl group, W, X,
Y and Z are each independently 0 or an integer, provided that 10≦W+X+Y+Z≦5000. Adjuvant composition.