JP3248801B2 - Enamel thinning liquid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an enamel dilute solution which is used by being added to a nitrocellulose-based coating enamel or nail enamel, which has excellent compatibility at the time of dilution and which is used for drying a coating film of the diluted enamel. The present invention relates to an enamel thinning solution having excellent smoothness and smoothness.

[0002]

2. Description of the Related Art Conventionally, in enamels for coating and nail enamels, there has been known an enamel diluting solution which is used by adding to a thickened or solidified enamel by evaporating a solvent with the lapse of time. It was simply composed of a solvent alone, and was intended to reproduce the usability of the enamel by adding it.

[0003]

However, it is difficult to adjust the amount to be added at the time of dilution. If the amount is too large, the viscosity of the enamel is too low, and the coating is repelled, resulting in a uniform film. In some cases, the coating film was too thin, resulting in poor durability, and the sedimentation of the pigment, etc., resulting in poor stability over time. If the added amount is too small, the usability will not be sufficiently reproduced, and even if the proper amount can be blended, the reproduction of the solvent balance of the conventional enamel is not perfect, so that the same quality cannot be obtained and tends to be inferior. there were. Accordingly, there has been a demand for an enamel thinning liquid which can obtain a quality level of a conventional product or a value added thereto by using the thinning liquid.

[0004]

Under such circumstances, the present inventors have conducted intensive studies and as a result, have found that the use of an enamel-lightening solution in which an acrylic-silicone-based graft copolymer, nitrocellulose and a volatile solvent are combined is used. The present invention was found to be free from repelling during coating, to have excellent stability over time, and to be able to further improve the drying property, smoothness, and gloss of the coating film, thereby completing the present invention.

That is, the present invention provides the following component (a):
(B) and (c) (a) Obtained by radical copolymerization of a dimethylpolysiloxane compound having a radical polymerizable group at one end of the molecular chain with a radical polymerizable monomer mainly composed of acrylate and / or methacrylate. 1 to 50% by weight of an acrylic-silicone-based graft copolymer (b) Nitrocellulose 0 to 20% by weight (c) A volatile organic solvent 30 to 99% by weight. is there. Hereinafter, the configuration of the present invention will be described in detail.

Examples of the acryl-silicone graft copolymer used in the present invention include those described in JP-A-2-25411. For example, the acryl-silicone graft copolymer has a molecular chain represented by the general formula (1). It is synthesized by radical copolymerization of a dimethylpolysiloxane compound (A) having a radical polymerizable group at one end and a radical polymerizable monomer (B) mainly composed of acrylate and / or methacrylate.

[0007]

Embedded image

R ₁ : methyl group or hydrogen atom R ₂ : divalent saturation of 1 to 10 carbon atoms having a linear or branched carbon chain optionally interrupted by one or two ether bonds a hydrocarbon group, _{specifically, -CH 2 -, - (CH} 2) 3 -, - (CH 2) 6 -, -
_{(CH 2) 8 -, -} (CH 2) 10 -, - CH 2 CH (C
_{H 3) CH 2 -, -} (CH 2) 2 O (CH 2) 3 -, - (CH
_{2) 2 OCH 2 CH (CH} 3) CH 2 -, - (CH 2 CH
₂ O) ₂ (CH ₂ ) ₃ — and the like. n: 3 to 300

On the other hand, the radically polymerizable monomer mainly composed of acrylate and / or methacrylate (B) means a compound having one radically polymerizable unsaturated bond in a molecule, and the acrylate and / or methacrylate used is , Methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth)
Hydroxyalkyl (meth) such as acrylate, alkyl (meth) acrylate such as 2-ethylhexyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, and 2-hydroxypropyl (meth) acrylate
Acrylates and perfluoroalkyl (meth) acrylates having 1 to 10 fluorocarbon chains can be exemplified.

In the radically polymerizable monomer of the present invention, various compounds other than the above-mentioned acrylate and / or methacrylate can be used as required. These polymerizable monomers include styrene, substituted styrene, vinyl acetate, (meth) acrylic acid,
Maleic anhydride, maleic ester, fumaric ester, vinyl chloride, vinylidene chloride, ethylene, propylene, butadiene, acrylonitrile, fluorinated olefin and the like can be exemplified.

The amount of the acrylic-silicone graft copolymer varies depending on the composition, but is 1 to 50% by weight, preferably 5 to 30% by weight. If the amount is less than 1% by weight, effects such as drying property and smoothness of the coating film are not sufficient,
If the amount is more than 50% by weight, the viscosity becomes too high, the compatibility becomes poor, and the hardness of the film may be reduced, which is not preferable.

As the nitrocellulose of the component (b) used in the present invention, the well-known nitrocellulose used in conventional nail polish products can be used. For example, nitrocellulose 1/2 second, 1/4 second, 1/8 second and the like,
One or more of these are arbitrarily compounded.
The main purpose of the blending in the present invention is to compensate for the hardness of the acrylic-silicone graft copolymer film. I don't mind. Further, the compounding amount is 0 to 20% by weight, preferably 0 to 20% by weight.
15% by weight.

The volatile organic solvent of the component (c) used in the present invention is not particularly limited as long as it has been used in conventional nail polish products.
Aromatic hydrocarbons such as xylene, methyl ethyl ketone, methyl isobutyl ketone, ketones such as acetone, esters such as ethyl acetate, butyl acetate, and isobutyl acetate;
Alcohols such as isopropanol, butanol, and ethyl alcohol are exemplified. Among them, ketones and acetates having good compatibility with nitrocellulose are preferably blended in an amount of 30% by weight or more based on the total amount of volatile organic solvents. The amount of the volatile organic solvent is 30 to 99% by weight, preferably 55 to 95% by weight.

The enamel thinning solution of the present invention contains, in addition to the above-mentioned essential components, resins, plasticizers, ultraviolet absorbers, fragrances, surfactants, cosmetic ingredients, etc. which are usually used in the enamel as long as the effects of the present invention are not impaired. It can be arbitrarily compounded.

[0015]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Reference Examples and Examples, but the present invention is not limited thereto. Reference Example 1 Synthesis of Acrylic-Silicone Graft Copolymer 40 g of methacrylate-substituted dimethylpolysiloxane having one end represented by the following chemical formula:

Embedded image After mixing 40 g of methyl methacrylate, 20 g of 2-ethyl-hexyl acrylate and 100 g of toluene, and then adding and dissolving 1.5 g of azobisisobutyronitrile, the mixture was stirred at 80 to 90 ° C. within a temperature range of 80 to 90 ° C. The reaction was carried out for a time to obtain a viscous solution. The solution was poured into 2 liters of methanol to precipitate the graft polymer.
The precipitate was filtered off and dried, yielding 88 g of a white product. This was confirmed by infrared absorption spectrum to be a methacrylate polymer to which dimethylpolysiloxane had been grafted. The weight average molecular weight in terms of polystyrene by GPC was about 15,000, and the glass transition temperature was 25 ° C. .

Reference Example 2 Synthesis of acryl-silicone graft copolymer 35 g of methacrylate-substituted dimethylpolysiloxane having one end represented by the following chemical formula:

Embedded image After mixing 45 g of methyl methacrylate, 20 g of 2-ethyl-hexyl acrylate and 100 g of toluene, and then adding and dissolving 1.5 g of azobisisobutyronitrile, the mixture was stirred at a temperature of 80 to 90 ° C. within a temperature range of 80 to 90 ° C. The reaction was carried out for a time to obtain a viscous solution. The solution was poured into 2 liters of methanol to precipitate the graft polymer.
The precipitate was filtered off and dried, yielding 88 g of a white product. The product was confirmed to be a methacrylate polymer to which dimethylpolysiloxane was grafted by an infrared absorption spectrum. The weight average molecular weight in terms of polystyrene by GPC was about 13,000, and the glass transition temperature was 37 ° C. .

Example 1 Nail polish thinners (samples 1 to 13) were prepared according to the composition and production method shown in Table 1.
After putting 10 g of a nail polish (standard product) manufactured according to the following formulation into a nail polish container, removing the cap and evaporating the solvent to 8 g, 4 g of the solvent was added, and the effect was evaluated. Table 2 shows the results.

(Formulation 1) Nail polish (standard product) (1) Nitrocellulose 1/4 15 (% by weight) (2) Alkyd resin 5 (3) Acrylic resin 3 (4) Shoe rose acetate isobutyrate 5 (5) Acetyltributyl citrate 5 (6) Camphor 2 (7) Ethyl acetate 10 (8) Butyl acetate 23 (9) Isopropyl alcohol 5 (10) Toluene 25 (11) Organic bentonite gelling agent 1 (12) Pigment 1 (Production method) ) After mixing (7) to (10), (1) to (6)
And dissolve with stirring. Next, (11) and (12) were added and the mixture was stirred and dispersed to obtain a product.

[0019]

[Table 1] (Manufacturing method) Each resin is added to a mixture of the solvents and uniformly mixed and dissolved.

(Evaluation method) Compatibility: A sample was added to a standard product obtained by evaporating a solvent.
The mixture was shaken three times and the degree of mixing was visually observed. Usability: The panel was used by 20 panelists, and the sample was compared with the feel (viscosity, growth) when using the standard product. Drying speed: The panel was used by 20 panelists, and the sample was compared with the drying speed of a standard product. Membrane smoothness: 20 panels were used, and the samples were compared with the smoothness of the standard membrane. Stability over time: The sample was visually compared with the stability of a standard product at 35 ° C. for one month, and evaluated. (Evaluation criteria) Very good: ◎, good: ○, ordinary: △,
Bad: ×, very bad: ××

[0021]

[Table 2]

As is clear from the results in Table 2, acrylic-
Samples using resins other than the silicone-based graft copolymer lack drying speed and film smoothness, and are samples of the present invention using a specific amount of the acrylic-silicone-based graft copolymer. Only showed significant effect.

Example 2 Enamel Thinning Solution for Coating An enamel thinning solution for coating having the following composition was prepared, and 50 g of an enamel for coating (standard product) manufactured according to the following formulation 2 was placed in a No. 8 standard bottle. The cap was removed, and the solvent was volatilized to 45 g, and 5 g or 10 g was added to the sample, and the effect was examined.

(Prescription) Acrylic-silicone graft copolymer ^{* 1} 40 (% by weight) Nitrocellulose 1/2 3 Butyl acetate 35 Toluene 22 (Production method) Produced in the same manner as in Example 1.

(Formulation 2) Enamel for coating Nitrocellulose 1/2 4 (% by weight) Acrylic resin 15 Dibutyl phthalate 1 Ethyl acetate 12 Butyl acetate 8 Isopropyl alcohol 8 Butanol 4 Butyl cellosolve 4 Toluene 44 (Preparation method) Manufacturing.

In Example 2, both the addition amounts of the enamel-lightening solution for coating of 5 g and 10 g were excellent in compatibility, drying property and smoothness of the coating film.

[0027]

The enamel thinning liquid of the present invention is excellent in compatibility at the time of dilution by being added to a nitrocellulose-based coating enamel and a nail enamel to improve the drying property and smoothness of the diluted enamel coating film. Excellent, it can improve the quality of the enamel before dilution.

Claims (1)

(57) [Claims] 1. The following components (a), (b) and (c): (a) a dimethylpolysiloxane compound having a radical polymerizable group at one end of a molecular chain and a radical mainly composed of acrylate and / or methacrylate. Acrylic-silicone graft copolymer obtained by radical copolymerization with a polymerizable monomer 1 to 50% by weight (b) Nitrocellulose 0 to 20% by weight (c) Volatile organic solvent 30 to 99% by weight An enamel-lightening solution characterized by the following: