JP6720017B2 - Aerosol products - Google Patents

Description

TECHNICAL FIELD The present invention relates to an aerosol product, and more particularly to an aerosol product capable of ejecting fine mist particles of an aerosol composition from a nozzle at a low speed.

Conventionally, aerosol products containing a liquefied gas such as LPG gas as a propellant are known. For example, in the aerosol product 10 described in Non-Patent Document 1, as shown in FIG. 2, a push-down type valve mechanism 20 is attached to an upper portion of a cylindrical container body 11 having a bottom portion 111 and a body portion 112, A cap 12 for protecting the valve mechanism is fitted.

The container body 11 contains an aerosol composition C containing a resin to form a liquid phase, and the aerosol composition C is filled with a propellant G such as LPG gas to form a gas phase. The aerosol composition C is a stock solution or a stock solution mixed with a propellant G.

The mounting cup 13 is clamped to the upper end of the body 112 of the container body 11 via a seal rubber (not shown), and the mounting cup 13 and the container body 11 are sealed by this seal rubber.
As shown in FIGS. 3 and 4, a protrusion 131 that is convex upward is formed in the center of the mounting cup 13. The upper end of the protrusion 131 is a disc-shaped top plate portion 131b, and an opening 132 is formed at the center of the top plate portion 131b. The valve mechanism 20 is attached to the opening 132. An actuator 14 is attached to the valve mechanism 20 as an operation unit for opening and closing the valve mechanism 20. At the tip of the injection passage 14a inside the actuator 14, a nozzle 141 for injecting the aerosol composition C filled in the container body 11 in a mist state by operating the actuator 14 that opens the valve mechanism 20 is formed.

The valve mechanism 20 has a housing 21, a stem 22, a dip tube 23, and a gasket 24.
The housing 21 includes a cylindrical housing main body 211 having an open upper end, and a cylindrical connecting portion 212 that is formed continuously from the lower end of the housing main body 211 and has a smaller diameter than the housing main body 211. The hollow portion 211a inside the housing body 211 and the hollow portion 212a inside the connecting portion 212 communicate with each other.
The housing 21 is inserted into the protruding portion 131 of the mounting cup 13 from the inside, and the protruding portion 211b of the housing body 211 is fitted and held in the recessed portion 131a formed in the peripheral wall of the protruding portion 131. A flexible gasket 24 made of synthetic resin is located between the upper end of the housing body 211 and the top plate portion 131b of the protrusion 131. The gasket 24 surrounds the opening 132 of the top plate portion 131 b, and the outer peripheral portion thereof is press-fitted to the recess 131 a of the protrusion 131. The housing 21 is positioned in the gas phase of the container body 11 while being held by the mounting cup 13.

On the side wall of the housing body 211, a lateral hole 211c (also referred to as a vapor tap hole or a VT hole) that connects the hollow portion 211a of the housing body 211 and the vapor phase of the container body 11 is formed.
The lateral hole 211c is set to have an inner diameter small enough to keep the atmospheric pressure of the gas phase inside the container body 11 sufficiently higher than the atmospheric pressure in the hollow portion 211a of the housing body 211 when the aerosol product 10 is used. The propellant G is introduced from the container body 11 into the housing body 211 through the holes 211c.

The stem 22 has a passage 22a for communicating between the hollow portion 211a of the housing body 211 and the injection passage 14a of the actuator 14, and the side wall of the stem 22 allows the hollow portion 211a of the housing body 211 and the passage 22a to communicate with each other. A stem hole 22b is formed.
When the aerosol product 10 is not used (FIG. 3), the gasket 24 is pressure-bonded to the opening outside the stem hole 22b to seal the inside of the container body 11.

The lower end of the stem 22 is accommodated in the hollow portion 211a of the housing body 211 so as to be vertically movable, and the movement of the stem 22 causes the gasket 24 to respond to open and close the stem hole 22b.
The outer diameter of the lower end of the stem 22 inserted into the hollow portion 211a of the housing body 211 is smaller than the inner diameter of the housing body 211, and there is a gap between the outer peripheral wall of the stem 22 and the inner peripheral wall of the housing body 211. Is provided so that the aerosol composition C introduced into the housing body 211 can pass through the gap.
A spring 25 is interposed between the lower end of the stem 22 and the bottom surface of the housing main body 211, and the spring 25 biases the stem 22 upward.

The actuator 14 is covered on the upper end portion of the stem 22, and the pushing operation of the actuator 14 moves the stem 22 downward. When the pressure is released, the stem 22 moves upward due to the elastic force of the spring 25.

The upper end of the dip tube 23 is connected to the connecting portion 212 of the housing 21, and the conduit 23 a of the dip tube 23 communicates with the hollow portions 211 a and 212 a of the housing 21. Further, the lower end of the dip tube 23 is located in the liquid phase of the aerosol composition C and reaches the bottom portion 111 of the container body 11.

To use the above aerosol product 10, first, the cap 12 is removed and the actuator 14 is pushed down with a finger. Then, as shown in FIG. 3, the stem 22 is pushed down against the urging force of the spring 25, and the gasket 24 is bent. Therefore, the opening of the stem hole 22b closed by the gasket 24 is opened, and the hollow portion 211a of the housing body 211 and the passage 22a of the stem 22 communicate with each other.
Since the passage 22a of the stem 22 communicates with the outside air via the actuator 14, the air pressure in the hollow portion 211a of the housing body 211 is lowered. Then, since the atmospheric pressure of the propellant G in the container body 11 becomes higher than the atmospheric pressure in the hollow portion 211a of the housing body 211, the aerosol composition C in the container body 11 is dipped as shown by an arrow A1 in FIG. It is introduced into the hollow portion 211 a of the housing body 211 through the conduit 23 a of the tube 23.

Further, as shown by an arrow A2, the propellant G is introduced into the hollow portion 211a through the lateral hole 211c of the housing body 211, and the introduced propellant G is mixed with the aerosol composition C. When the propellant G is already mixed with the aerosol composition C in the state of being contained in the container body 11, the propellant G introduced from the lateral hole 211c when the aerosol product 10 is used is further aerosol composition. Mixed with C.

The aerosol composition C mixed with the propellant G passes through the gap between the housing body 211 and the stem 22 as shown by an arrow A3, and passes through the stem hole 22b of the stem 22 as shown by an arrow A4. 22a, and is sprayed in the air from the nozzle 141 through the injection passage 14a of the actuator 14 into the air.
At this time, the propellant G mixed with the aerosol composition C vaporizes and forms bubbles in the aerosol composition C, but the hollow portion 211a of the housing body 211, the passage 22a of the stem 22, and the ejection passage 14a of the button are formed. Since the atmospheric pressure is gradually lowered in this order, the bubbles gradually expand, and eventually the bubbles collapse and the aerosol composition C can be broken into a fine mist.

The actuator 14 may be pushed down until the entire opening of the stem hole 22b is opened (fully pushed), or the actuator 14 may be pushed down to such an extent that a part of the opening of the stem hole 22b is opened (half pushed). ). By adjusting the pressing amount of the actuator 14 with a finger, the injection amount of the aerosol composition C is adjusted.

Such an aerosol product 10 has conventionally been used as a hair spray (hair spray) by filling the interior of the hair styling composition as the aerosol composition C.
In recent years, hair styling using such a hair spray is required to have a strong keeping power while having a soft and soft texture, that is, a so-called airy feeling. In order to achieve a soft texture and a strong keeping force, the applicant does not keep a plurality of hairs together as a single lump, but rather attaches each hair at a point to form the entire hair. We found that it was effective to keep. For this purpose, it is effective to eject fine particles of the hairdressing composition from the hair spray at low speed to attach the fine particles of the hairdressing composition to each hair.

Japan Aerosol Society website, "Structure and Principles", search August 5, 2016, Internet, http://www.aiaj.or.jp/structure.html

However, when the conventional aerosol product 10 described above is used for a hair spray, it does not become sufficiently small so that the fog particles adhere to each hair at the time of spraying, and the momentum of spraying is strong, so that the entire hair is sprayed. Since the composition adheres to the composition and the hair becomes one lump, it is difficult to prepare hair having a soft and soft texture, and the airy feeling is often lost.
In order to reduce the fog particles, the diameter of the lateral hole 211c of the housing body 211 of the aerosol product 10 is increased so that the propellant G is introduced more into the hollow portion 211a of the housing body 211 and mixed with the aerosol composition C. It is conceivable to increase the amount of the agent G. This is because the amount of air bubbles contained in the aerosol composition C increases, so that the aerosol composition C is more finely broken and ejected. However, when the propellant G is contained in a large amount, the aerosol composition C is broken more vigorously, so that the momentum of ejection becomes stronger. That is, finer fog particles are generated as the momentum of injection is larger, and if the momentum of injection is weakened, the fog particles become larger, so weakening the jet momentum and making the fog particles finer are usually It is technically conflicting.

An object of the present invention is to provide an aerosol product in which fine atomized particles of an aerosol composition are jetted at a low speed.

The aerosol product according to the present invention comprises a pressure-resistant container body having an opening at the top, a valve mechanism provided at the opening, an operation unit for opening and closing the valve mechanism, and the operation unit for opening the valve mechanism. Is provided with a nozzle that performs a spraying operation, and the container body is filled with an aerosol composition containing a resin and LPG gas on the aerosol composition. The valve mechanism includes a housing having a hollow portion inside, a stem that has a passage communicating between the hollow portion and the nozzle, and a stem that opens and closes a valve provided in the passage by an operation of the operation portion. , A dip tube having one end reaching the bottom of the container body and the other end communicating with the hollow portion of the housing, wherein the housing has an inner hollow portion through a conduit of the dip tube. Only the inside of the container body is isolated so as to communicate with the inside of the container body. The dip tube has an inner diameter of 1.0 mm or more and 1.3 mm or less, and the LPG gas filled in the container body has a pressure of 0.1 MPa or more and 0.2 MPa or less, and the aerosol composition Has a resin concentration of 0.5 W/W% or more and 5 W/W% or less.

The Applicant has eliminated the lateral holes conventionally provided in the housing, reduced the diameter of the dip tube as described above, and set the pressure of the LPG gas and the resin concentration of the aerosol composition as described above, whereby It has been found that the fine mist particles of the composition can be jetted at low speed.

The aerosol composition is a hair styling composition, the particle size of the mist ejected from the nozzle is 50 μm or more and 80 μm or less, preferably 56.1 μm or more and 68.1 μm or less, and the mist wind speed is It is preferably 2.53 m/s or more and 3.05 m/s or less.

By spraying the hairdressing aerosol composition from the nozzle with the particle diameter of the mist and the wind speed, it becomes possible to attach fine mist particles of the hairdressing composition to each hair.

The aerosol composition,
(A): (Acrylates/alkyl acrylate/alkyl acrylamide) copolymer or salt thereof,
(B): (Acrylates/octyl acrylamide) copolymer or its salt, and (C): ethanol, and the weight ratio of contained (A) and (B) is 1:0.3-1. This weight ratio is preferably 1:0.4 to 0.9, more preferably 1:0.4 to 0.8, and further preferably 1:0.5 to 0.7.

According to the present invention, fine mist particles of an aerosol composition can be jetted from a nozzle at low speed.

It is sectional drawing which shows the principal part of the aerosol product which concerns on one Embodiment of this invention. It is sectional drawing which shows the whole structure of the conventional aerosol product. FIG. 3A is a cross-sectional view showing a main part of the conventional aerosol product when it is not used, and FIG. The state at the time of using the conventional aerosol product is shown, (A) is sectional drawing which shows a principal part, (B) is an expanded sectional view of a principal part.

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a sectional view of a main part of an aerosol product 10 according to an embodiment of the present invention. The aerosol product 10 of the present invention is configured by replacing the conventional housing 21 and dip tube 23 shown in FIGS. 2 to 4 with the housing 21 and dip tube 23 of the present embodiment.

In the aerosol product 10 of FIG. 1, the housing 21 is isolated from the inside of the container body 11 so that the inner hollow portion 211a communicates with the inside of the container body 11 only through the conduit 23a of the dip tube 23. .. That is, the horizontal hole 211c is not formed in the housing body 211 unlike the conventional example.
Further, a reduced diameter portion 212b that radially projects toward the hollow portion 212a is formed at the upper end portion of the coupling portion 212 of the housing 21. The dip tube 23 is inserted into the hollow portion 212a of the connecting portion 212 of the housing 21, and the upper end of the dip tube 13 is in contact with the lower surface of the reduced diameter portion 212b.

In the present invention, the dip tube 23 having an inner diameter of 1.0 mm or more and 1.3 mm or less is used.
The pressure of the LPG gas, which is the propellant G with which the inside of the container body 11 is filled, is 0.1 MPa or more and 0.2 MPa or less.
The aerosol composition C has a resin concentration of 0.5 W/W% or more and 5 W/W% or less. In this embodiment, the aerosol composition has a resin concentration of 2.75 W/W% and 1.375 W/W%. Created C.

Aerosol composition C is a hair styling composition,
(A): (Acrylates/alkyl acrylate/alkyl acrylamide) copolymer or salt thereof,
(B): (Acrylates/octyl acrylamide) copolymer or its salt, and (C): ethanol, and the weight ratio of contained (A) and (B) is 1:0.3-1. The weight ratio of A) and (B) is preferably 1:0.4 to 0.9, more preferably 1:0.4 to 0.8, and further preferably 1:0.5 to 0.7. ..

According to the aerosol product 10 of the present invention, the particle diameter of the mist which is ejected as the mist from the nozzle 141 is 50 μm or more and 80 μm or less, and preferably 56.1 μm or more and 68.1 μm or less. The wind speed of the sprayed mist is 2.53 m/s or more and 3.05 m/s or less.

Experimental example

Examples 1 to 4 were prepared as the aerosol product 10 of the present invention, and measurement experiments of the particle size of the sprayed mist and the wind speed of the mist were performed on these Examples 1 to 4 and Comparative Examples 5 to 8.
The measurement conditions common to Examples 1 to 4 and Comparative Examples 5 to 8 are that the length from the bottom 111 of the container body 11 to the opening 132 of the protrusion 131 is 185.15 mm, and the inner diameter of the container body 11 is 52.5 mm. Is. The dip tube 23 has a length of 162 mm, and the nozzle 141 of the actuator 14 has an inner diameter of 0.33 mm. The pressure of LPG gas is 0.15 MPa. The aerosol composition C has a weight ratio of (A) and (B) of 1:0.57 and a resin concentration of 2.75 W/W%.

Table 1 shows the measurement conditions of Examples 1 to 4 and the measurement conditions of Comparative Examples 5 to 8.
Examples 1-4 use the aerosol product 10 of the present invention.
Comparative Examples 5 and 6 use the aerosol product 10 having the same configuration as in Examples 1 to 4, but the inner diameter of the pipe line 23a of the dip tube 23 is set to 3.2 mm, and the pipe line 23a of the dip tube 23 is used. The difference is that the connecting portion 212 of the housing 21 is inserted.
Comparative Examples 7 and 8 differ from Example 1 in the structure of the housing 21, and use the conventional aerosol product 10 shown in FIGS. 1 to 3 in which the housing body 211 is formed with the lateral hole 211c. Other configurations are the same as those in the first embodiment.

The method of measuring the particle size of fog is as follows. The spray particle size distribution measuring device (manufactured by Microtrac Bell Co., device name: Aerotrac LDSA-SPR3500A) was placed at a position 20 cm away from the nozzle 141 of the aerosol product 10 shown in Examples and Comparative Examples. The aerosol composition C was jetted from the aerosol product 10 toward the measuring device, and the average particle diameter of the droplets jetted by the measuring device was measured. The average particle size is a calculated value of the diameter of a theoretical sphere obtained from the equivalent surface area.

The method of measuring the wind speed of fog is as follows. An air velocity measuring device (manufactured by Sato Corporation, device name: wind-cup type digital waterproof anemometer AM-4221) is placed at a position 25 cm away from the nozzle 141 of the aerosol product 10 shown in the examples and comparative examples, and the aerosol product 10 is removed. The aerosol composition C was injected toward the measuring device, and the wind speed (m/s) of the mist injected by the measuring device was measured.

Table 1 shows the measurement results of the mist particle size and the mist wind speed.
(1) In Examples 1 to 4, by setting the inner diameter of the dip tube 23 to 1.0 mm or 1.3 mm, the particle diameter of the sprayed mist was 56.1 μm or 68.1 μm, and the sprayed mist was sprayed. The wind speed of fog was 2.53 m/s and 3.05 m/s. On the other hand, in Comparative Examples 5 and 6, the inner diameter of the dip tube 23 was 3.2 mm, the particle size of the sprayed mist was 110.5 μm and 122.4 μm, and the wind speed of the sprayed mist was: It was 3.94 m/s and 4.22 m/s. In Examples 1 to 4, by making the inner diameter of the dip tube 23 smaller than in Comparative Examples 5 and 6, the particle diameter of fog was small and the wind speed of fog was low.
When the aerosol products 10 of Examples 1 to 4 were used for hair styling, a strong keeping power could be maintained while having an airy feeling. On the other hand, when Comparative Examples 5 and 6 were used for hair styling, the particle diameter of the fog was large and the wind speed of the fog was high, so the composition was sticky to the entire hair and the hair became one lump, resulting in an airy feeling. Is gone. Further, especially when the half-pressed state of the actuator 14 was continued, particles of uneven mist and partially large fog were observed.

(2) Next, comparing Examples 1 and 3 with Comparative Example 5 and Examples 2 and 4 with Comparative Example 6, respectively, the inner diameter of the reduced diameter portion 212b of the connecting portion 212 and the inner diameter of the passage 22a of the stem 22 are compared. Even if the same, the smaller the inner diameter of the dip tube 23, the smaller the particle size of the mist, and the lower the mist wind speed.
Further, comparing Examples 1 and 2 and Examples 3 and 4, even if the inner diameter of the dip tube 23 is the same, the inner diameter of the reduced diameter portion 212b of the connecting portion 212 and the inner diameter of the passage 22a of the stem 22 are small. The smaller the particle size of the fog, the slower the wind speed of the fog.

(3) Next, comparing Example 1 and Comparative Example 7 and Example 3 and Comparative Example 8, respectively, even if the dip tube 23 has the same inner diameter, Examples 1 and 3 are Comparative Examples 7 and 8 The particle size of the fog was smaller than that of, and the wind speed of the fog became slow. When Comparative Examples 7 and 8 were used for hair styling, the particle diameter of the fog was large and the wind speed of the fog was high, so that the composition was adhered to the entire hair in a sticky manner, and the hair became one lump, and there was no airy feeling. It was Further, particles of a large fog having a nonuniform particle diameter were partially observed, and dripping occurred from the nozzle 141 when the half-pressed state of the actuator 14 was continued.

As described above, the applicant eliminates the lateral hole 211c that is conventionally provided in the housing 21, reduces the diameter of the dip tube 23, and sets the pressure of the LPG gas and the resin concentration of the aerosol composition C to predetermined values. It was found that by doing so, the fine mist particles of the aerosol composition C can be jetted at a low speed. As a result, when the aerosol product 10 of the present invention was used for hair styling, it was possible to maintain a strong keeping power while having an airy feeling.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

10 Aerosol Product 11 Container Main Body 111 Bottom 12 Cap 13 Mounting Cup 132 Opening 14 Actuator (Operating Section)
141 nozzle 14a injection path 20 valve mechanism 21 housing 211 housing body 211a hollow part 212 connecting part 212a hollow part 211c lateral hole 22 stem 22a passage 23 dip tube 23a conduit 24 gasket 25 spring C aerosol composition G LPG gas (propellant)

Claims (3)

A pressure-resistant container body having an opening at the top,
A valve mechanism provided in the opening,
An operation unit for opening and closing the valve mechanism,
A nozzle that performs a spray operation by the operation of the operation unit that opens the valve mechanism,
The container body is filled with an aerosol composition containing a resin, and LPG gas on the aerosol composition,
The valve mechanism is
A housing having a hollow portion inside,
A stem which has a passage for communicating between the hollow portion and the nozzle, and which opens and closes the passage by causing a gasket to respond to an operation of the operation portion;
One end reaches the bottom of the container body, the other end has a dip tube that communicates with the hollow portion of the housing,
The housing is isolated from the inside of the container body such that the inner hollow portion communicates with the inside of the container body only through the conduit of the dip tube,
The dip tube has an inner diameter of 1.0 mm or more and 1.3 mm or less,
The LPG gas filled inside the container body has a pressure of 0.1 MPa or more and 0.2 MPa or less,
The aerosol composition is an aerosol product having a resin concentration of 0.5 W/W% or more and 5 W/W% or less. The aerosol composition is a hair styling composition,
The particle size of the mist ejected from the nozzle is 50 μm or more and 80 μm or less,
The aerosol product according to claim 1, wherein the wind speed of the fog is 2.53 m/s or more and 3.05 m/s or less. The aerosol composition,
(A): (Acrylates/alkyl acrylate/alkyl acrylamide) copolymer or salt thereof,
(B): (Acrylates/octyl acrylamide) copolymer or its salt, and (C): ethanol, and the weight ratio of contained (A) and (B) is 1:0.3-1. Or the aerosol product according to 2.

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