JP2013032166A - Method for manufacturing metal can for aerosol container and aerosol product using the metal can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a metal can for an aerosol container to which an inner surface coating is directly and uniformly applied on an inner surface of the metal can by an electrostatic powder coating method.SOLUTION: There is provided the method for manufacturing metal can for aerosol container in which a cut edge at an upper end of an opening is turned upward in a straight line, a bottomed cylindrical metal can body 20 having an annular recess for holding an aerosol valve is formed at a lower part of the opening, and charged resin powder P is adhered to the inner surface of the can body 20 to form the inner surface coating by heat treatment.

Description

  The present invention relates to a method for producing a metal can for an aerosol container and an aerosol product using the metal can.

The aerosol product includes an aerosol container comprising a bottomed cylindrical metal can and an aerosol valve attached to the opening of the metal can, an aerosol composition comprising a stock solution and a propellant filled in the aerosol container, and an aerosol container. It consists of a discharge member to be mounted. In the aerosol product, when the discharge member is operated, the aerosol valve is opened, and the aerosol composition (contents) is discharged. In other words, the user can discharge the required amount without touching the contents, so it is used for various purposes such as cosmetics for hair, cosmetics for skin care, hair dyes, antiperspirants, insecticides, etc. It has been.
The aerosol composition may corrode metals depending on the type of stock solution or a combination with a propellant, and a synthetic resin coating is provided on the inner surface of a metal can of an aerosol product to prevent corrosion. In general, the coat is provided by spraying a solution obtained by dissolving a thermosetting resin such as epoxyphenol or polyamideimide in an organic solvent on the inner surface of the can and performing a heat treatment. However, the coating provided by the above-mentioned method may have uneven coating thickness due to the film thickness of the resin adhered by spraying or the way heat is transmitted, and if there is an extremely thin part, it will be concentrated from that part. There is a risk that it will be corroded by holes. Therefore, means for protecting the inner surface of the can other than the above-described methods have been studied.
For example, Patent Document 1 discloses a metal can for an aerosol container in which a preform made of a cylindrical synthetic resin is expanded in a metal can, and the expanded preform (inner bag) is arranged in the metal can. ing.
Further, Patent Document 2 discloses a can body for an aerosol container in which a synthetic resin powder is attached to the inner surface of a cylindrical can copper having both ends opened, and then heat treatment is performed to provide a synthetic resin inner surface coat. Is disclosed.
Further, Patent Document 3 discloses a metal can for an aerosol container provided with an inner surface coat by applying a dispersion type paint in which powder particles made of synthetic resin are dispersed and drying.

Japanese Patent Publication No. 6-9855 JP-A-10-71346 JP 2005-119742 A

However, since the metal can of Patent Document 1 causes the preform to expand in the metal can, the degree of expansion differs depending on the shape of the metal can, and the thickness of the inner surface coat is difficult to be uniform. Furthermore, preforms adapted to the respective shapes of the metal cans having various shapes are required, the mold cost is high, and the production is troublesome. Further, when the inner bag is formed by expanding (blow molding) the preform inside the can, it shrinks when the inner bag cools, and thus becomes smaller than the volume of the can, and the filling rate of the contents becomes small. Therefore, when the filling amount of the contents is the same, the can with the inner bag is larger than the can without the inner bag, particularly a two-component hair dye that uses two metal cans connected together. Is difficult to hold and the discharge member is difficult to operate.
In addition, Patent Document 2 uniformly coats the entire inner surface of the can body with a desired thickness by placing a synthetic resin powder charged in an air flow from one opening of the can body to the other opening. However, in order to make a metal can, after the inner surface coat is provided on the can body, a process of winding and fixing the can bottom and the eye metal on both ends of the can body is necessary, and the inner surface coat is easily damaged.
Furthermore, in Patent Document 3, since the solution is sprayed and applied, the coating film is likely to be uneven, and it is difficult to spray uniformly and pinholes are likely to occur.
An object of the present invention is to provide a method for producing a metal can for an aerosol container, in which a uniform coat can be provided on the inner surface of the metal can and the coat is not easily damaged even if an aerosol valve is attached.

The method for producing a metal can for an aerosol container according to the present invention has a bottomed cylindrical metal having an annular recess for holding an aerosol valve at the lower portion of the opening, with the cut end at the upper end of the opening facing straight upward. It is characterized in that a made can body is molded, a charged resin powder is adhered to the inner surface of the can body, and an inner surface coat is formed by heat treatment.
In such a manufacturing method, it is preferable that the bottom of the can body is substantially planar. The resin powder is preferably polyethylene powder, polyamide powder, or polyethylene terephthalate powder.
The aerosol product of the present invention comprises an aerosol container comprising a metal can produced by the method for producing a metal can of the present invention and an aerosol valve fixed to the opening of the metal can, and an acidic or alkaline solution filled in the aerosol container. And an aerosol composition comprising a stock solution and a propellant.
The two-component aerosol product of the present invention is a first aerosol in which an aerosol container provided with a metal can produced by the method for producing a metal can of the present invention is filled with a first aerosol composition comprising an alkaline stock solution and a propellant. A second aerosol product in which an aerosol container comprising a product and a metal can produced by the metal can production method of the present invention is filled with a second aerosol composition comprising an acidic stock solution and a propellant, and the first It has the connection member which connects an aerosol product and a 2nd aerosol product, It is characterized by the above-mentioned.

  The method for producing a metal can for an aerosol container according to the present invention has a bottomed cylindrical metal having an annular recess for holding an aerosol valve at the lower portion of the opening, with the cut end at the upper end of the opening facing straight upward. Since the can made is molded, the charged resin powder is adhered to the inner surface of the can body, and the inner surface coat is formed by heat treatment, the inner surface coat is formed uniformly, and no pinhole is formed in the inner surface coat. This metal can does not need to be processed after the inner surface coating is provided, and the aerosol valve is fixed by caulking the opening of the cover cap from the outside to the inside. No great external force is applied to the inner coat of the can. Therefore, the inner surface coat is hard to break and the metal can is hardly corroded by the contents. In particular, the inner surface coat can be uniformly formed regardless of the height of the metal can, the diameter and shape of the can body.

In such a manufacturing method, when the bottom of the can body is substantially planar, voltage is easily applied evenly to the bottom of the can, and the resin powder is applied to the bottom of the can and to the end of the can body and the can bottom. Can evenly adhere and form a coat. The bottom portion is substantially flat. The bottom portion may not be completely flat, and the center portion may be recessed (convex to the inner surface side) as long as the voltage is evenly applied to the bottom portion. . In particular, it is preferable that the diameter is 5% or less, preferably 4% or less, with respect to the diameter of the can (bottom).
In such a manufacturing method, when the resin powder is polyethylene powder, polyamide powder, or polyethylene terephthalate powder, the inner surface coat formed by these is relatively hard. Therefore, by forming a metal can body, attaching charged resin powder to the inner surface of the can body, and forming an inner surface coat by heat treatment, it is possible to form a hard inner surface coat without uniform pinholes. it can.

Aerosol products using metal cans manufactured by such a manufacturing method have a highly corrosive resistant inner surface coat, so acidic or alkaline stock solutions (highly corrosive, such as hair dyes, Highly permeable contents) can be stored for a long period of time, and an aerosol product with high corrosion resistance of metal cans due to the contents can be obtained.
The aerosol product of the present invention does not contain an inner bag unlike conventional containers used for highly permeable contents such as hair dyes, so the filling rate of the contents in the container is large.
Therefore, even if the metal can is designed to be small, sufficient contents can be stored. Therefore, it can be preferably used as a two-component aerosol product in which two aerosol containers are connected.

FIG. 1a is a cross-sectional view showing an embodiment of an aerosol container manufactured by the manufacturing method of the present invention, and FIGS. 1b and 1c are cross-sectional views showing the aerosol valve and metal can of FIG. 1a, respectively. These are sectional drawings which show other embodiment of the bottom part of the metal can manufactured by this invention. 2a and 2b are process diagrams showing a method for producing a metal can for an aerosol container according to the present invention. 3a and 3b are process diagrams showing a method for producing a metal can for an aerosol container according to the present invention. It is sectional drawing which shows one Embodiment of the aerosol product manufactured by the manufacturing method of this invention.

FIG. 1 illustrates an aerosol container 10 manufactured by the manufacturing method of the present invention.
As shown in FIG. 1 a, the aerosol container 10 includes a bottomed cylindrical metal can 11 having an open upper end and an aerosol valve 12 that closes the opening of the metal can 11. The aerosol container 10 is preferably used for a highly reactive content, particularly a content that easily corrodes the metal used in the metal can 11.

As shown in FIG. 1c, the metal can 11 includes a can body 20 and an inner surface coat 21 formed on the inner surface thereof.
The can body 20 is provided at a cylindrical body portion 16, a substantially planar bottom portion 17 that closes a lower end of the body portion, a shoulder portion 18 provided at an upper end of the body portion, and an upper end of the shoulder portion 18. It is an integrally molded body including the mouth portion 19. An annular recess 15 that is recessed toward the center of the can 20 is formed at the boundary between the shoulder 18 and the mouth 19. Further, the annular cut end 19a at the upper end of the mouth portion 19 faces straight upward. That is, the can body 20 does not include a bead portion whose upper end is continuous with the inner surface and the outer surface, and is provided with an inner surface and an outer surface with a cut 19a facing straight above the mouth portion 19. . In this embodiment, the bottom 17 is flat. However, as described above, it may be slightly recessed (convex on the inner surface side). For example, the entire surface may be recessed in a spherical or conical shape, the outer peripheral portion may be flat and only the central portion may be recessed in a spherical or conical shape (see FIG. 1d), and from the outer periphery toward the center. , An annular flat surface portion, an annular taper portion, and a central circular portion (as a whole, a truncated cone shape) (see FIG. 1e). Among them, at least the outer peripheral portion is preferably a flat surface. In these cases, the respective heights (dents) are 5% or less, preferably 4% or less, relative to the diameter of the can (bottom).
The outer peripheral surface of the can body 20 was charged positively or negatively with an electrode or the like, and the inner surface of the trunk portion 16, the substantially flat bottom portion 17, the shoulder portion 18 and the mouth portion 19 had a charge opposite to that of the can body. Adhere resin powder. Thereafter, the inner surface coat 21 is formed by heat treatment. The inner surface coat 21 is provided to prevent corrosion due to the contents.
The can body 20 is formed of a metal such as aluminum, an aluminum alloy, or tinplate.

As the metal can 11, a metal having a height from the bottom portion 17 to the upper end of the mouth portion 19 of 40 to 160 mm, particularly 50 to 150 mm, and an outer diameter of the body portion 16 of 10 to 35 mm, particularly 15 to 32 mm. Can 11 is preferred. Moreover, it is preferable that the height from the bottom part 17 to the upper end of the mouth part 19 is 3 to 10 times, particularly 4 to 8 times the outer diameter of the body part 16. Furthermore, in order to give sufficient strength to the substantially planar bottom portion 17, the thickness is preferably 0.3 to 2 mm, particularly preferably 0.5 to 1.5 mm.
When it is thinner than 0.3 mm, the strength is insufficient, and when it is thicker than 2 mm, the resin powder hardly adheres, and the thickness of the coat tends to be uneven.

Examples of the resin powder for the inner surface coat 21 include thermoplastic resins such as polyethylene (PE) powder, polyamide (PA) powder such as nylon powder, polyethylene terephthalate (PET) powder, polybutylene terephthalate (PBT) powder, and polypropylene (PP) powder. Is mentioned. The average particle diameter of the resin powder is preferably 0.1 to 100 μm, particularly preferably 1 to 80 μm. When the average particle diameter is less than 0.1 μm, there is a problem that the adhesion efficiency is poor because the particles are easily scattered, and the powders are aggregated and cannot be uniformly adhered. When the average particle diameter is 100 μm or more, there are problems such that it is difficult to float in the metal can 11, the film thickness tends to be non-uniform, and even if it adheres, it tends to peel off from the can.
Among the powders, the PE powder and the PA powder are preferably used when the content of the stock solution is acidic and the content of the stock solution is an alkaline stock solution, and the content of the PET powder is acidic. It is preferable to use when filling. The film thickness of the inner surface coat 21 after the heat treatment is preferably 10 to 300 μm, particularly preferably 30 to 200 μm. When the film thickness is less than 10 μm, the film thickness is too thin and the metal can tends to be corroded by contents such as a hair dye having high permeability. When the film thickness is greater than 300 μm, the film thickness tends to be non-uniform and tends to peel off.

As shown in FIG. 1b, the aerosol valve 12 is inserted into the mouth portion 19 of the metal can 11 and has a cylindrical plug body 26 made of synthetic resin that closes the metal can 11, and a cylindrical shape held by the plug body. A housing 27, a stem 28 held in the housing so as to be movable up and down, a stem rubber 29 held in the housing and closing the stem hole of the stem, a spring 30 for constantly biasing the stem 28 upward, and a plug The cover 26 covers the body 26 and the lower end thereof is caulked to the annular recess 15 of the metal can 11. When this aerosol valve is fixed to a metal can, the lower end of the cover cap 31 is caulked to the annular recess 15, but the plug 26 with which the inner surface coat of the annular recess 15 is in direct contact is made of synthetic resin. The load on the inner surface coat 21 inside the annular recess 15 can be minimized by the force. Further, the plug body 26 has a space (annular groove portion 26c) between the portion (outer peripheral portion) 26a that contacts the annular recess 15 and the housing holding portion 26b, and this space is inward by receiving an external force radially inward. Since it can shrink, the load on the inner surface coat 21 inside the annular recess 15 can be minimized. Therefore, the inner surface coat 21 is hardly damaged.
Also, a ring-shaped sealing material 32 is provided between the stopper 26 and the upper end of the can mouth 19. In this embodiment, the plug body 26 is used. However, as shown in FIG. 4, the synthetic resin housing 27a is held in the annular recess 15 without using the plug body 26, and the mouth of the metal can 11 is directly closed. Good. In that case, the sealing material 32 is provided between the housing 27 a and the upper end of the mouth portion 19 of the metal can, and the cover cap 31 covers the housing, and the lower end is caulked to the annular recess 15 of the metal can 11. At this time, the annular recess 15 is slightly deformed, but the deformation can be minimized by the elastic force of the synthetic resin housing 27a, and the inner surface coat 21 is hardly damaged. Also in this case, the housing 27a is formed with an annular recess 27a2 that contracts inward by receiving an external force inward in the radial direction inside the outer peripheral portion 27a1 that contacts the annular recess 16.

  The manufacturing method of the metal can 11 for aerosol containers is shown below. Metal pellets are formed into a bottomed cylindrical shape by impact processing, drawing or ironing, and the upper end is cut and aligned (trimming processing) to form a bottomed cylindrical body. Thereafter, the upper portion of the bottomed cylindrical body is subjected to drawing to form a shoulder portion, and the annular recess 15 is formed to form the can body 20. Finally, the inner can 21 is formed on the inner surface of the can 20 to manufacture the metal can 11.

Formation of the inner surface coat 21 on the can 20 is performed by an electrostatic powder coating method using the electrostatic powder coating apparatus 35 of FIG.
The electrostatic powder coating apparatus 35 has a bottomed cylindrical holder 36 for inserting and holding the can body 20, and moves in the axial direction of the holder 36 relative to the holder 36, and from the opening of the held can body 20. The spraying device 37 sprays the resin powder P. The holder 36 includes an outer cylinder cover portion 36a and an inner cylinder charging portion 36b. The charging unit 36b is connected to the high-voltage power source 36c and charges the can body 20 with positive ions or negative ions. The spraying device 37 includes a cylindrical outer wall portion 37a, a cylindrical holding portion 37b provided therein, and a nozzle portion 37c provided at the center thereof. The spray device 37 moves in the direction of the holder 36, thereby forming a closed space S <b> 1 between the can body 20 and the spray device 37, and the tip of the nozzle portion 37 is disposed near the opening of the can body 20. In this embodiment, the closed space S <b> 1 is formed by the holding portion 37 b coming into contact with the outer periphery of the mouth of the can body 20. The holding unit 37b is provided with a vacuum device 37d, which can collect the resin powder floating in the closed space without adhering to the inner surface of the can body. The closed space may be formed by bringing the outer wall portion 37a of the spraying device 37 into contact with the cover body 36a of the holder 36.

  Since the electrostatic powder coating apparatus 35 is configured as described above, as shown in FIG. 2A, the can body 20 is held by the holder 36 covering the outer periphery of the can body 20, and the charging unit 36b is used by using the high voltage power source 36c. Is charged to an anion. Thereby, the whole can 20 is charged with anions. On the other hand, the resin powder P charged with cations is sprayed into the can body 20 from the tip of the nozzle portion 37c. Thereby, the resin powder P charged with positive ions uniformly adheres to the inner surface of the can body 20 charged with negative ions. In particular, since the can body 20 has a substantially flat bottom portion, the entire bottom portion 17 and the high-voltage power source 36c can be uniformly connected, and a potential difference at the bottom portion 17 hardly occurs and the resin powder P is uniformly attached. Can do. After spraying the resin powder P into the can body 20, as shown in FIG. 2b, the inside of the can body 20 is sucked by the vacuum device 37d, and the excess resin powder P is collected.

  Moreover, you may use the electrostatic powder coating apparatus 35a as shown in FIG. The electrostatic powder coating apparatus 35a of FIG. 3 is substantially the same as the electrostatic powder coating apparatus 35 of FIG. The nozzle part 39 has a plurality of spray ports 39a formed on a cylindrical side surface. Further, when the spraying device 37 moves in the direction of the holder 36, it is inserted deeply into the can body 20. Two or three spray ports 39 a are preferably provided at equal intervals in the axial direction of the nozzle portion 39. Thereby, the resin powder P can be uniformly sprayed on the inner surface of the can 20.

Thereafter, in a state where the resin powder is adhered in the can body 20, the can body 20 is heated at a temperature equal to or higher than the melting temperature of the resin powder to melt the resin powder, thereby forming the inner surface coat 21.
The can 20 and the resin powder P may be charged with opposite ions. Further, as shown in FIG. 3a, the outer peripheral surface of the can body 20 may be connected to the ground wire via the charging portion 36b, and the resin powder P charged with positive ions or negative ions may be sprayed. Also in this case, the resin powder P can be uniformly adhered to the inner surface of the can 20.
In the metal can manufacturing method of the present invention, since the outer peripheral surface of the can 20 is connected to a high-voltage power source or ground, it is preferable to perform the external surface treatment such as external coating after the metal can 11 is manufactured.

  Since the metal can 11 for an aerosol container manufactured by the manufacturing method of the present invention is provided with the inner surface coat 21 after the can body 20 is formed, after the inner surface coat 21 is formed as in the prior art, the drawing process is performed. It is not necessary to perform a can molding process such as, and scratches or the like are not formed on the formed inner surface coat 21. In particular, when the metal can 11 is small, the stress given by processing is large, which is preferable. In addition, since the aerosol container 10 uses the metal can 11 provided with the cut 19a facing straight upward at the upper end, when fixing the aerosol valve, the aerosol container 10 can be assembled with a minimum deformation, The inner coat is hard to be damaged. Furthermore, since the inner surface coat 21 is formed by the electrostatic powder coating method, it can be provided uniformly in the metal can 11. As described above, the inner surface coat 21 has no pinholes and is uniform, and therefore, even when a highly corrosion-resistant content is filled, the metal can is not corroded and the content can be retained for a long time.

  When filling the aerosol container 10 with the contents, the metal can 11 is prepared, and after the stock solution is filled therein, the aerosol valve 12 is held in the annular recess 15 of the metal can 11 to close the opening. The lower end of the cover cap 31 is caulked and fixed to the annular recess 15 of the metal can 11. The propellant is then filled from the stem 28 of the aerosol valve. However, the aerosol valve 12 may be caulked and fixed to the metal can 11 after filling with the propellant (under cup filling).

  As a preferable thing of the aerosol composition with which the metal can for aerosol containers manufactured by the manufacturing method of this invention is filled, the undiluted | stock solution and propellant with high corrosiveness with respect to a metal are mentioned. In particular, a hair dye having high permeability and high reactivity is preferable. As such a hair dye, a first aerosol composition for a hair dye comprising an alkaline first agent stock solution containing an oxidative dye and a propellant, an acidic second agent stock solution containing an oxidant, and a propellant A two-component hair dye comprising a second aerosol composition for hair dyes, and a one-component acid hair dye containing an acid dye.

The case where the content is a two-component hair dye will be described.
As the first aerosol composition for a hair dye of the two-component hair dye, an oxidation dye, a hair dye auxiliary component, an alkali agent, a stabilizer, a viscosity modifier, other effects that exhibit effects other than the hair dyeing effect. Examples thereof include a first agent stock solution containing an active ingredient, a surfactant, an oily component and the like in a solvent, and a propellant.

The oxidation dye is not particularly limited as long as it is a normal oxidation dye used for oxidation hair dyes. For example, paraphenylenediamine, paraphenylenediamine sulfate, paratoluylenediamine, N, N-bis (2-hydroxy) 1) or 2 of ethyl) -paraphenylenediamine, N-phenyl-paraphenylenediamine, diaminodiphenylamine, 2-chloroparaphenylenediamine, N, N-dimethylparaphenylenediamine, paraaminophenol, metaaminophenol, orthoaminophenol More than seeds can be used. In particular, paraphenylenediamine, paraphenylenediamine sulfate, paraaminophenol, metaaminophenol and the like are preferable from the viewpoint of good hair dyeing effect.
The content of the oxidation dye is preferably 0.01 to 10% by mass, more preferably 0.1 to 5% by mass in the first agent stock solution. When the content of the oxidative dye is less than the lower limit, a sufficient hair dyeing effect tends to be hardly obtained, and even when the content is more than the upper limit, the hair dyeing power does not change and is not economical.

The hair dyeing auxiliary component is not particularly limited as long as it is a normal hair dyeing auxiliary component used in oxidation hair dyes. For example, one or two or more of acid dyes, direct dyes, other auxiliary components, and the like are used. Can be used.
Examples of the acid dye include amaranth (red No. 2), erythrosine (red No. 3), new coccin (red No. 102), rose bengal (red No. 105), acid red (red No. 106), and tartrazine (yellow). 4), Sunset Yellow (Yellow 5), Fast Green (Green 3), Brilliant Blue FCF (Blue 1), Indigo Carmine (Blue 2), Rose Bencal K (Red 232), Orange II (Daidai) Color No. 205), Uranine (Yellow No. 202), Quinoline Yellow WS (Yellow No. 203), Alizanin Cyanine Green F (Green No. 201), Pyranine Conch (Green No. 204), Patent Blue (Blue No. 203), Resorcin Brown (Brown 201), Violamine R (Red 401), Orange I (Dai 40) No.) naphth - Ruero S (403 Yellow No.), naphthol green B (No. green 401), Arizu roll purple (No. 401 purple), and the like Naphthol Blue Black (No. 401 black).
Examples of the direct dye include 4-nitro-O-phenylenediamine, 2-nitro-p-phenylenediamine, 1-amino-4-methylanthraquinone, 1,4-diaminoanthraquinone, 2-amino-4-nitrophenol, Examples include 2-amino-5-nitrophenol and picric acid.
Examples of the other auxiliary components include resorcin, pyrogallol, catechol, metaaminophenol, metaphenylenediamine, orthoaminophenol, 2,4-diaminophenol, 1,2,4-benzenetriol, toluene-3,4- Diamine, toluene-2,4-diamine, hydroquinone, α-naphthol, 2,6-diaminopyridine, 1,5-dihydroxynaphthalene, 5-aminoorthocresol, diphenylamine, paramethylaminophenol, phloroglucin, 2,4-diamino Phenoxyethanol, gallic acid, tannic acid, ethyl gallate, methyl gallate, propyl gallate, 5- (2-hydroxyethylamino) -2-methylphenol and their salts, aromatic alcohols such as benzyl alcohol, E phenethyl alcohol, benzyloxy ethanol, N- methylpyrrolidone, alkyl pyrrolidones such as N- ethyl-pyrrolidone, ethylene carbonate, such as a lower alkylene carbonates such as propylene carbonate.

The alkali agent is not particularly limited as long as it is a normal alkali agent used for oxidative hair dyes. For example, 2-amino-2-methyl-1-propanol, monoethanolamine, triethanolamine, isopropanolamine, One or more of alkanolamines such as triisopropanolamine, ammonia, potassium hydroxide, sodium hydroxide, potassium carbonate, calcium carbonate, potassium bicarbonate, ammonium bicarbonate and the like can be used. In particular, amines such as ammonia are preferably used from the viewpoint of high hair dyeing effect.
When the alkali agent is contained, it is preferably 0.01 to 10% by mass, more preferably 0.1 to 5% by mass in the first agent stock solution. When the content of the alkaline agent is less than the lower limit, the hair dyeing effect tends to be difficult to be obtained, and when it is higher than the upper limit, the irritation to the hair, the scalp and the like tends to be strong.

  The stabilizer is not particularly limited as long as it is a normal stabilizer used for oxidative hair dyes. For example, anhydrous sodium sulfite, L-sodium ascorbate, pentetate, disodium hydrogen phosphate, etidronate , Phenacetin, EDTA, 8-hydroxyquinoline, acetanilide, sodium pyrophosphate, barbituric acid, uric acid, tannic acid, paraben, edetate and the like can be used.

  The viscosity modifier is not particularly limited as long as it is a normal viscosity modifier used for oxidative hair dyes. For example, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose ethyl ether, carboxy 1 type (s) or 2 or more types, such as sodium methylcellulose, a quaternary nitrogen containing cellulose ether, a carboxy vinyl polymer, a xanthan gum, can be used.

Other active ingredients that exhibit an effect other than the hair dyeing effect are not particularly limited as long as they are ordinary active ingredients used in oxidative hair dyes. For example, propylene glycol, glycerin, 1,3-butylene glycol, Moisturizers such as collagen, hyaluronic acid, sodium lactate, urea, paraoxybenzoic acid ester, sodium benzoate, phenoxyethanol, benzalkonium chloride, benzethonium chloride, chlorhexidine chloride, silver and other antibacterial / preservatives, paraaminobenzoic acid, paraaminobenzoic acid UV absorbers such as acid monoglycerin ester, octyl salicylate, phenyl salicylate, isopropyl paramethoxycinnamate, octyl paramethoxycinnamate, glycine, alanine, leucine, serine, tryptophan, cystine, cysteine, methioni Amino acids such as aspartic acid, glutamic acid and arginine, retinol, retinol palmitate, pyridoxine hydrochloride, benzyl nicotinate, nicotinamide, nicotinic acid dl-α-tocopherol, vitamin D2, dl-α-tocopherol, dl-α-acetic acid Vitamins such as tocopherol and pantothenic acid, hormones such as elastradiol and ethinylestradiol, antioxidants such as ascorbic acid, dibutylhydroxytoluene and butylhydroxyanisole, peony extract, loofah extract, rose extract, lemon extract, aloe extract, Eucalyptus extract, sage extract, tea extract, seaweed extract, placenta extract, various extracts such as silk extract, polyoctanium 6, polyoctanium 7, polyoctanium 2 Conditioning agents such as, can be used one or two or more of such perfumes.

  The surfactant is used for the purpose of discharging the aerosol composition in the form of foam, and is not particularly limited as long as it is a normal surfactant used for oxidative hair dyes. For example, sorbitan fatty acid ester, glycerin fatty acid ester , Polyglycerin fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyethylene glycol fatty acid ester, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene castor oil / cured castor oil, Polyoxyethylene lanolin alcohol, polyoxyethylene alkylamine, polyoxyethylene fatty acid amide, fatty acid alkylol amide, alkyl polyglucoside, polyoxyethylene / methylpolysiloxane Xanthene copolymer, polyoxypropylene / methylpolysiloxane copolymer, poly (oxyethylene / oxypropylene) / methylpolysiloxane copolymer, fatty acid soap, N-acyl glutamate, N-acyl glutamic acid, N-acyl glycine Salt, N-acylalanine salt, behentrimonium methosulfate / cetanol / isoalkyl (C10-40) amidopropylethyldimonium methosulfate, polyoxyethylene lauryl ether sodium sulfate, sodium lauryl sulfate, etc. Can be used.

  The oil component is not particularly limited as long as it is a normal oil component used for oxidative hair dyes. For example, methylpolysiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, octamethylcyclotetrasiloxane, methylphenylpolysiloxane. Silicone oils such as siloxane, ester oils such as isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, diethoxyethyl succinate, hydrocarbons such as squalane, squalene, isoparaffin, liquid paraffin, camellia oil, corn Oils, olive oil, rapeseed oil, sesame oil, castor oil, jojoba oil, coconut oil and other fats and oils, capric acid, lauric acid, myristic acid, higher fatty acids such as palmitic acid, stearic acid, behenic acid, myristyl Call, cetyl alcohol, stearyl alcohol, can be used behenyl alcohol, higher alcohols, such as lanolin alcohol, beeswax, lanolin, candelilla wax, one or more of such waxes such as microcrystalline wax (wax).

Examples of the solvent include water, alcohols, and mixtures thereof. Examples of the water include purified water, ion exchange water, and physiological saline. Examples of the alcohols include monovalent lower alcohols such as ethanol and isopropanol, ethylene glycol, propylene glycol, 1,3-butylene glycol, glycerin, diglycerin, diethylene glycol, dipropylene glycol, triethylene glycol, and polyethylene glycol. And polyhydric alcohols such as polypropylene glycol.

  Examples of the propellant include compressed gas and liquefied gas. Examples of the compressed gas include nitrogen gas, carbon dioxide gas, nitrous oxide gas, oxygen gas, and compressed air. Examples of the liquefied gas include propane, normal butane, isobutane, and liquefied petroleum gas that is a mixture thereof, dimethyl ether, hydrofluoroolefins such as trans-1,3,3,3-tetrafluoroolefin, and mixtures thereof. It is done. Furthermore, you may mix | blend compressed gas and liquefied gas.

  The second aerosol composition for hair dye containing the oxidizing agent includes an oxidizing agent, a pH adjuster, a stabilizer, a viscosity adjuster, other active ingredients that exhibit effects other than the hair dyeing effect, and a surfactant. , A second agent stock solution containing an oil component or the like in a solvent, and a propellant.

The oxidizing agent is not particularly limited as long as it is a normal oxidizing agent used for oxidative hair dyes. For example, hydrogen peroxide, oxidase, and the like can be used.
When hydrogen peroxide is contained as the oxidant, it is preferably 0.1 to 10% by mass, more preferably 1 to 6% by mass in terms of pure content in the second agent stock solution. When the content of the oxidizing agent is less than the lower limit, the oxidizing power is insufficient and a good hair dyeing effect tends to be difficult to be obtained. When the content is higher than the upper limit, there is a tendency for irritation to the hair and scalp to become stronger. .
The oxidase is not particularly limited as long as it is a normal oxidase used for oxidative hair dyes. For example, one or more of laccase, peroxidase, uritase, catalase, tyrosinase, etc. can be used. .

The pH adjuster is not particularly limited as long as it is a normal pH adjuster used for an oxidative hair dye, and for example, one or more of phosphoric acid, citric acid, sulfuric acid, acetic acid, lactic acid, tartaric acid and the like. It is preferable to adjust the pH of the second agent stock solution to a range of 1 to 6, and further to 2 to 5.

In addition, the same component as what was illustrated by the above-mentioned 1st aerosol composition can be used for the said stabilizer, a viscosity modifier, surfactant, an oil-based component, a solvent, and a propellant.
In the case of a one-component acidic hair dye, an acidic dye, a hair dye auxiliary component, a pH adjuster, a stabilizer, a viscosity adjuster, other active ingredients that exhibit effects other than the hair dyeing effect, surface activity Agents, stock solutions containing oily ingredients in the solvent, and propellants.
As these components, the same components as those exemplified for the two-component hair dye described above can be used.

As shown in FIG. 4, the two-pack hair dye is stored in two aerosol containers each of the first aerosol composition for hair dye and the second aerosol composition for hair dye.
A two-pack aerosol product 40 shown in FIG. 4 includes a first aerosol product 41 filled with the hair dye first aerosol composition A and a second aerosol product 42 filled with the hair dye second aerosol composition B. And a discharge member 43 that connects them and operates each aerosol product at the same time.
Since the first aerosol product 41 is filled with the first aerosol composition A composed of an alkaline hair dye first stock solution and a propellant, PA or PE is used as the inner surface coat 21 of the metal can 11. . On the other hand, since the second aerosol product 42 is filled with the second aerosol composition B composed of the acidic hair dye second stock solution and the propellant, PA, PE or PET is used as the inner surface coat 21 of the metal can 11. Is used.
The discharge member 43 includes a cylindrical holding member 46 that holds the two aerosol containers 10 and a push button 47 that is attached to the stem 28 of the two aerosol containers 10. The holding member 46 is provided with a cylindrical outer cylinder portion 46a, two cylindrical holding portions 46b that are provided in the inside thereof, and hold the respective aerosol containers 10, and an outer portion that connects the outer cylinder portion 46a and the holding portion 46b. The connecting portion 46c includes an inner connecting portion 46d that connects the holding portions 46b. The push button 47 includes a rectangular main body 47a and a cylindrical nozzle portion 47b protruding forward from the front surface thereof. At the lower end of the main body 47a, two stem connection portions 48a that are connected to the stem 28 of each aerosol container 10 are formed. Further, a communication passage 48b that connects the two stem connecting portions 48a and the nozzle portion 47b is formed inside the main body 47a.
Since it is configured in this manner, by pressing down the push button 47, the stems 28 of the first and second aerosol products 41 and 42 can be pressed down simultaneously, and two contents can be discharged from the nozzle portion 47b. .
Since the aerosol product 40 uses the metal can 11 manufactured according to the present invention, even a two-component hair dye can be stably stored in each aerosol container for a long period of time.

DESCRIPTION OF SYMBOLS 10 Aerosol container 11 Metal can 12 Aerosol valve 15 Annular recessed part 16 Trunk part 17 Bottom part 18 Shoulder part 19 Mouth part 19a Cut 20 Can body 21 Inner surface coat 26 Plug body 27 Housing 28 Stem 29 Stem rubber 30 Spring 31 Cover cap 32 Seal material 35 35a Electrostatic powder coating device 36 Holder 36a Cover portion 36b Charging portion 36c High voltage power supply 37 Spraying device 37a Outer wall portion 37b Holding portion 37c, 39 Nozzle portion 37d Vacuum portion 39a Spray port 40 Two-part aerosol product 41 First aerosol product 42 Second aerosol product 43 Discharge member 46 Holding member 46a Outer tube part 46b Holding part 46c Outer connection part 46d Inner connection part 47 Push button 47a Main body 47b Nozzle part 48a Stem connection part 48b Communication path A First hair dye Aazo Le compositions B dyeing second aerosol composition dosage

Claims (5)

The bottom end of the opening is formed with a bottomed cylindrical metal can having an annular recess for holding the aerosol valve at the bottom of the opening,
The charged resin powder is attached to the inner surface of the can body,
An inner coat is formed by heat treatment.
A method for producing a metal can for an aerosol container. The manufacturing method of Claim 1 whose bottom part of the said can body is substantially planar shape. The resin powder is polyethylene powder, polyamide powder, or polyethylene terephthalate powder,
The manufacturing method according to claim 1. An aerosol container comprising a metal can produced by the production method according to claim 1 and an aerosol valve fixed to an opening of the metal can;
An aerosol composition comprising an acidic or alkaline stock solution and a propellant filled in the aerosol container,
Aerosol products. A first aerosol product in which an aerosol container including a metal can manufactured by the manufacturing method according to claim 1 is filled with a first aerosol composition comprising an alkaline stock solution and a propellant, and the manufacturing method according to claim 1. In an aerosol container with a manufactured metal can,
A second aerosol product filled with a second aerosol composition comprising an acidic stock solution and a propellant;
A two-part aerosol product having a connecting member for connecting the first aerosol product and the second aerosol product.