JPS6261003B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention uses safe and non-toxic polyvinyl acetal dialkylamino acetate instead of highly dangerous nitrocellulose as a film-forming agent, and uses a non-toxic aliphatic lower alcohol as a true solvent to improve storage stability, film properties, etc. Regarding good nail enamel. Conventionally, nail enamel uses nitrocellulose as a film-forming agent and toluene as a diluent, but nitrocellulose is a dangerous substance with explosive properties, and toluol is easily flammable, toxic, and can cause damage to the skin. Although the use of these bases has been viewed as a problem, no satisfactory solution has yet been found. In view of the current situation, the present inventors conducted intensive research and found that, as described below, when a specific film component is used in combination with a specific solvent, a nail enamel composition that is homogeneous and stable even without the use of toluene can be obtained. generate,
Moreover, when used as a coating, it was recognized that a film as good as that when using nitrocellulose could be formed, and the present invention was completed. An object of the present invention is to provide a nail enamel that is safe, non-toxic, has excellent storage stability, and can form a film with good gloss, hardness, flexibility, and water resistance. That is, in the present invention, the film component consists of polyvinyl acetal dialkylamino acetate and at least one selected from the group consisting of abiethyl alcohol, rosin, epoxy rosin, and silica, and an aliphatic lower alcohol as a true solvent. Nail enamel is characterized by being dissolved in the nail enamel. Embodiments of the present invention will be described below. Polyvinyl acetal lower dialkylamino acetate as a film forming agent used in the present invention is a dialkylamino acetate of polyvinyl acetal in a narrow sense (acetaldehyde acetal of polyvinyl alcohol), which is obtained by partially esterifying polyvinyl alcohol with monochloroacetic acid and then It is obtained by aminating polyvinyl acetal monochloroacetate obtained by acetalizing with acetaldehyde with a di-lower alkylamine in which each alkyl group has 1 to 4 carbon atoms. Examples of the polyvinyl acetal lower dialkylamino acetate include polyvinyl acetal dimethylamino acetate, polyvinyl acetal ethylamino acetate, polyvinyl acetal dipropylamino acetate, polyvinyl acetal dibutylamino acetate, and the like. The degree of acetalization of the polyvinyl acetal lower dialkylamino acetate is 40 to 70 mol%, preferably 45 to 65 mol%. Acetalization degree
If it is less than 40 mol%, the solubility of the true solvent in aliphatic lower alcohol and the water resistance of the film tend to decrease.
If it exceeds 70 mol%, the dispersibility of pigments and the like and the water resistance of the film tend to deteriorate. The degree of esterification of polyvinyl acetal lower dialkylamino acetate is 15 to 40 mol%, preferably 20 to 35%. If the degree of esterification is less than 15 mol%, the dispersibility of pigments and solubility in aliphatic lower alcohols may decrease;
If it exceeds this amount, the gloss of the film may decrease or a yellowish film may be formed. The molecular weight of polyvinyl acetal lower dialkylamino acetate is usually 40,000 to 90,000, preferably 50,000 to 80,000. The amount (content) of polyvinyl acetal dialkylamino acetate used is 10 to 30% by weight, preferably 15 to 25% by weight, based on the total amount of the formulation (nail enamel). 10% by weight
If it is less than 30% by weight, the drying speed will be slow and the film strength will tend to decrease, and if it is more than 30% by weight,
It becomes difficult to dissolve and apply, and storage stability may deteriorate. As coating aids, abiethyl alcohol rosin, epoxy rosin and silica are used alone or in combination of two or more. The amount used (content) is 3 to 15% by weight, preferably 5 to 12% by weight, based on the total amount of the formulation. 3% by weight
If it is less than 15% by weight, the water resistance, adhesion, etc. of the resulting film will tend to decrease, and if it is more than 15% by weight,
Storage stability tends to decrease, and the flexibility, abrasion resistance, etc. of the resulting film tend to decrease. The aliphatic lower alcohols used in the present invention are non-toxic and therefore include ethyl alcohol, n-
Propyl alcohol, iso-propyl alcohol, n-butyl alcohol and the like are preferred. The amount of aliphatic lower alcohol used is based on the total amount of the prescription.
60-80% by weight, preferably 65-75% by weight.
When it is less than 60% by weight, the solubility of the film component and the storage stability of the product tend to decrease, and when it is more than 80% by weight, the drying rate tends to be slow. Other ingredients used in the nail enamel of the present invention include coloring materials (pigments, dyes), and appropriate amounts of plasticizers, polyvinyl acetate, polymethacrylic esters, etc. can be added as necessary. . The present invention uses polyvinyl acetal lower dialkylaminoacetate as a film forming agent and at least one selected from the group consisting of abiethyl alcohol, rosin, epoxy rosin, and silica as a film auxiliary agent in combination as a film component. In particular, the water resistance, gloss,
In addition to improving adhesion and abrasion resistance, it dissolves in a safe, non-toxic aliphatic lower alcohol to form a uniform and stable solution system, and uniformly disperses pigments and the like. Furthermore, we have succeeded in industrially advantageously producing a safe, non-toxic nail enamel that can form a film with the same good gloss, hardness, flexibility, and water resistance as when using nitrocellulose. The product value is also extremely high. Examples of the present invention will be described below. In the examples, parts refer to parts by weight, and % refers to % by weight.
means. (1) Gloss The "Glossiness Measuring Method" of JIS-Z-8741 was applied mutatis mutandis. (2) Pencil hardness Apply nail polish (sample) to a thickness of 80 mm on a nylon plate, leave it at room temperature for 12 hours, and use a tensile tester to scratch the film under the conditions of a load of 300 g and an angle of 45 degrees. The minimum pencil hardness was measured. B, HB, FH, etc. displayed are the hardness of the pencil. (3) Flexibility A nylon plate coated with nail polish to a thickness of 80 mm was bent 180 degrees once every day after coating, and the period (number of days) until cracks appeared was measured. (4) Water resistance Apply nail polish to a thickness of 40mm on the gas plate,
After being left at room temperature for 24 hours, the glass plate was immersed in water at 20°C, and the degree of whitening of the film was observed after 12 hours. Example 1 (1) Production method Polyvinyl acetal diethylaminoacetate (DEAA) (acetalization degree 59% esterification degree
61%, molecular weight 66000), rosin, epoxy rosin (acid value 4.8, saponification value 105), and Sierra Tsuk are dissolved in the required amount of alcohol, and then the required amount of coloring materials is kneaded into the solution. In this way, each nail enamel shown in the formulations in Table 1 was manufactured. (2) Formulation and product characteristics

[Table] Example 2 Nail enamels having the formulations shown in Table 2 were manufactured according to the manufacturing method of Example 1, and then the film properties, storage stability, etc. were examined in the same manner as above.

【table】

[Table] Comparative Example 3 (Conventional nail enamel using nitrocellulose as a film forming agent) Nitrocellulose 19.0 parts, alkyd resin 15.0 parts
A conventional nail enamel consisting of 18.0 parts of butyl acetate, 12.0 parts of ethyl acetate, 20.5 parts of toluol, 6.0 parts of dibutyl phthalate, 20.5 parts of butanol, and 6.5 parts of coloring material was produced by a conventional method. The obtained nail enamel had a pencil hardness of 40.9, a pencil hardness of F, extremely good water resistance (◎), and flexibility after 3 days. The storage stability of the product was also good (○). Example 3 The same procedure as Invention 4 in Example 1 was carried out, except that polyvinyl acetal dimethylamino acetate (DMAA used in Example 2) was used instead of polyvinyl acetal diethylaminoacetate, and the nail of Invention 8 was prepared. produced enamel. The gloss of the film in the obtained nail enamel is
43.0, the pencil hardness was F, the water resistance was very good (◎), the flexibility was 3 days, and the product had very good storage stability (◎). Example 4 Polyvinyl acetal diethylamino acetate (used in Example 1) was used instead of polyvinyl acetal dimethylamino acetate (DMAA).
A nail enamel of Invention 9 was produced in the same manner as Invention 6 in Example 2, except that DEAA) was used. The gloss of the film in the obtained nail enamel is
At 44.0, the pencil hardness is F, the water resistance is ◎, the flexibility is 3 days, and the storage stability of the product is extremely good (◎). Example 5 The present invention 4 and Examples in Example 1 except that polyvinyl acetal dibutylaminoacetate (acetalization degree 60.5 mol%, esterification degree 59.5 mol%, molecular weight 64000) was used instead of polyvinyl acetal diethylaminoacetate. The present invention 10 was carried out in the same manner as the present invention 7 in 2.
Both nail enamels of Invention 11 and Invention 11 were produced. In both of the obtained nail enamels,
The water resistance of the film was extremely good (◎), the pencil hardness was F, the flexibility was 3 days, and the storage stability of both products was extremely good (◎). In addition, the gloss of the film in both nail enamels is
The former (present invention 10) is 43.0, and the latter (present invention 11) is
It was 44.5.

Claims (1)

[Scope of Claims] 1. The film component consists of polyvinyl acetal lower dialkylaminoacetate and at least one selected from the group consisting of abiethyl alcohol, rosin, epoxy rosin, and silica,
Nail enamel is characterized by being dissolved in aliphatic lower alcohol as a true solvent. 2. The nail enamel according to claim 1, wherein the polyvinyl acetal lower dialkylamino acetate is polyvinyl acetal diethylamino acetate, polyvinyl acetal dimethylamino acetate, polyvinyl acetal dibutylamino acetate, or a combination thereof. 3 Polyvinyl acetal lower dialkylamino acetate is 10 to 30% by weight based on the total amount of the formulation.
Nail enamel according to claim 1, which contains: 4. The nail enamel according to claim 1, wherein the polyvinyl acetal dialkylamino acetate has a degree of acetalization of 40 to 70 mol% and a degree of esterification of 15 to 40 mol%. 5. The nail enamel according to claim 1, wherein at least one selected from the group consisting of abiethyl alcohol, rosin, epoxy rosin, and silica is contained in an amount of 3 to 15% by weight based on the total amount of the formulation. 6 Claim 1 in which the aliphatic lower alcohol is contained in an amount of 60 to 80% by weight based on the total amount of the formulation.
Nail enamel as described in section. 7. The nail enamel according to claim 1, wherein the aliphatic lower alcohol is ethyl alcohol, iso-propyl alcohol, n-propyl alcohol, n-butyl alcohol, or a combination thereof.