JPH1057849A - Aerosol composition containing powder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a process in which a jetted substance is applied uniformly without the retention of the powder of a button part by filling a container equipped with a mechanical break-up type button having a bent part in the channel between an expansion chamber outlet and a nozzle hole with contents in which the weight ratio between powder containing a main component of a specified particle size and a jetting agent is in a specified range. SOLUTION: An aerosol composition containing powder used for sweat controlling agent, a resolution-analgesic, etc., is prepared so that powder 1-20μm in particle size and a jetting agent are main components, and the weight ratio between them (powder/jetting agent) is 0.1-12/80-99.9, and a container equipped with a mechanical break-up type button having a bent part 3 in the channel 2 between an expansion chamber outlet 1 and a nozzle hole 4 is filled with the aerosol composition. In the aerosol composition containing powder, the quantity of liquefied gas reaching the central part on an application surface is reduced, the reduction of the cold feeling of the central part can be attempted, and use feeling can be improved greatly. Inorganic powder such as silica and talc and organic powder of polyethylene, etc., are named as the powder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composition comprising powder and a propellant as a main component (contents) in a container provided with a jet button having a bent portion in a flow path between the outlet of the expansion chamber and the nozzle. ), And by giving conditions to the properties of the contents, the feeling of use in antiperspirants, antiphlogistic analgesics, etc. is good,
The present invention relates to a powder-containing aerosol composition capable of spraying contents uniformly.

[0002]

2. Description of the Related Art As shown in FIGS. 1 and 3, an aerosol composition is prepared by adding a propellant-containing content 11 to a pressure-resistant container 10.
, And by pressing the injection button upper part 5 taken at the top of the container body, the contents 11 are injected from the injection port 4 through the flow path 2 from the expansion chamber outlet 1.

[0003] The ejection state of the contents (ejected material) is greatly affected by the structure of the ejection button. The structure of the injection button can be roughly classified into two types, as shown in FIG. 3, a straight type in which the flow path from the expansion chamber outlet 1 to the injection port 4 inside the button is straight, and FIG. As shown
A mechanical break-up type having a spiral flow path (shown in FIG. 2C) near the injection port 4 is known. The arrow drawn in each figure represents the flow of the contents.

[0004] The straight-type button has a feature that, due to its structure, a jet is discharged in a stream form and adheres intensively to a target portion. On the other hand, in the mechanical breakup type button, the ejected material is uniformly discharged in a fan shape due to the button structure, and the particle diameter of the ejected material is mechanically reduced. Furthermore, it has the characteristics of increasing the contact efficiency between the propellant and air and hastening the vaporization of the propellant.

Accordingly, in the case of an aerosol product using a compressed gas in which the propellant itself does not vaporize, the propellant is discharged in the form of a stream when a straight type button is used, and in the form of a mist when a mechanical breakup type button is used. In addition, among the aerosol products that use a liquefied gas that self-vaporizes as a propellant, especially those that contain powder, mechanical breakup buttons with a complicated button internal structure may cause the powder to clog inside the button. Easy and difficult to use.

[0006] For this reason, in general, a straight type button has been used for a material having powder as a content, but cooling by vaporization of the liquefied gas is biased toward the center, so that a pain or a cold sensation occurs in the center. It is easy to feel and may cause frostbite. On the other hand, in general, when the content does not contain powder, a mechanical break-up type button is often used, the bias toward the center of the jet is small, and excessive cooling hardly occurs.

By the way, antiperspirants, antiphlogistic analgesics, etc., which have powder as a composition, are filled in pressure-resistant containers having straight buttons, but are filled in pressure-resistant containers having mechanical break-up buttons. It is desirable to be done. However, in practice, such filling means have not yet been adopted. The reason is that, in the powder-containing aerosol composition, when trying to use a mechanical breakup type button in order to perform uniform application of the ejected material, the mechanical breakup type button has a structure in which the flow path of the ejected material is narrow and bent. For this reason, powder tends to cause clogging inside the button. Therefore, as a matter of course, a straight type spray button for an aerosol composition containing powder has been used.

[0008]

However, when a straight type button is used, the jetted material tends to be concentrated at the central portion because the stream is ejected in a stream form, so that the coating becomes non-uniform and the coating becomes uneven. there were. Furthermore, the cooling due to the vaporization of the liquefied gas is also biased toward the center, and antiperspirants,
In the case of the use of a human body such as an antiphlogistic analgesic, pain or cold sensation due to excessive cooling is easily felt in the center, and there is a problem in use such as generation of frostbite. Accordingly, an object of the present invention is to provide an aerosol composition having a powder as a content such as an antiperspirant, an antiphlogistic and an analgesic filled in a pressure vessel having a mechanical break-up type button.

[0009]

Under such circumstances, the present inventors have conducted intensive studies and as a result, mechanically improved the antiperspirant and antiphlogistic / analgesic compositions mainly composed of propellants and powders of specific properties. Even when filling a container equipped with a mold button, the spray can be applied uniformly over a wide range without clogging of powder at the button part, increasing the contact efficiency between liquefied gas and air and accelerating vaporization. Thus, an aerosol composition that can be used has been completed.

Therefore, according to the present invention, the particle size is 1 to 20 μm.
The powder and the propellant are the main components, and the content ratio by weight of the powder and the propellant is 0.1 to 12/80 to 99.9. A powder-containing aerosol composition is provided, which is filled in a container provided with a mechanical breakup button having a bent portion in a flow path.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The powder-containing aerosol composition filled in a container using the mechanical break-up button of the present invention (schematically shown in FIG. 2) reduces the amount of liquefied gas reaching the center on the application surface, The cooling sensation in the center can be reduced. Further, since the concentration of the jets at the central portion is reduced, the difference in cooling sensation between the central portion and the peripheral portion is reduced, and the feeling of use is greatly improved.

The propellant used in the present invention includes propane, butane, isobutane, pentane, isopentane, dimethyl ether and the like.

The powder includes inorganic powders such as silica, talc, bentonite and kaolinite; organic powders such as polyethylene and nylon; antiperspirant components such as aluminum chlorohydrate and derivatives thereof; And inorganic powder or organic powder.

The particle size of these powders is preferably from 1 to 20 μm, more preferably from 5 to 15 μm. If the particle size exceeds 20 μm, a problem occurs that the button portion is clogged. If the particle size is less than 1 μm, the powder may be scattered before reaching the coating surface. Moreover,
It is particularly preferable that the powder used in the present invention has a true spherical shape and / or a silicon-treated surface, because the incidence of clogging of the powder is reduced.

These powder-containing aerosol compositions have a weight ratio of powder to propellant of 0.1 to 12/80 to 9
9.9, preferably 1 to 10/85 to 95. If the content ratio of the powder is higher than this, the mechanical break-up type button may be clogged, which is not preferable.

The strength of the cooling sensation is indicated by the air micro value of the spray button. The air micro value is a pressure difference (mm) between the injection port 4 and the expansion chamber inlet 6 when a constant flow rate of gas flows.
Hg). 8m gas flow without button
When set to 1 / sec, the effect is not desirable unless the air micro value of the mechanical breakup type button is usually 200 mmHg or more. The content ratio by weight of the powder and the propellant used in the present invention is 0.1.
In the case of the content of 1 to 12/80 to 99.9, the air micro value is preferably 200 to 400. If the air micro value is 400 or more, clogging of the powder inside the button becomes remarkable, and normal injection cannot be performed.

Further, it is preferable to add a siloxane compound to the composition for the purpose of further improving the clogging of the powder at the button portion. Examples of the siloxane compound used in the present invention include, but are not limited to, dimethylpolysiloxane, cyclic siloxane, methylphenylsiloxane, and modified siloxane.

The aerosol composition of the present invention may be used for antiperspirants, antiphlogistic analgesics, lotions, perfumes, hair care agents, paints, and the like. In particular, antiperspirants which are aerosol compositions for the human body Those intended for agents, perfumes, lotions, anti-inflammatory analgesics and the like are suitable.

[0019]

EXAMPLES Next, the present invention will be further described with reference to examples, but the present invention is not limited to these examples.

Examples 1 and 2 and Comparative Examples 1 to 4 Powder-containing aerosol compositions as shown in Table 1 were prepared, and their evaluations were judged. These are also shown in Table 1. In Table 1, M.P. B. There is a mechanical break-up type button, S. B. There is a straight button, and the numerical values of the stock solution (powder, oil, etc.) and the propellant are g.

[0021]

(Uniformity Test of Deposits (Measurement of Degree of Whitening)) A sample was sprayed on black paper, and the degree of whitening (A) at the center and the degree of whitening (B) at 3 cm from the center adhering on a circle were determined by color difference. Measure using a meter. At this time, the uniformity of the attached matter was determined based on the value of (AB). Here, the sample application conditions are a spray distance of 15 cm, a spray time of 2 seconds, and a sample temperature of 25 ° C.
The determination method is as follows: ：: (AB) <3, 、: 3 <(A
-B) <5, x: (AB)> 5.

(Cold Pain Confirmation Test) The panel N was set to 10, the injection distance was 10 cm, the injection time was 4 seconds, and the ambient temperature was 25 ° C. In addition, the judgment method was based on a five-level evaluation of sensory evaluation, 5: no cold feeling, 4: slightly cold, 3: unpleasant cold,
2: Pain is felt, 1: Intense pain is felt, where ４: 4 or more, ：: 3-4, Δ: 2-3, X: 1
And 2.

(Button clogging test) 40 ° C., 25 ° C., 5
Store the sample at <RTIgt; 0 C, </ RTI> spray half-open every 4 days for 4 seconds, and make sure there is no clogging when spraying within 10 seconds. The number of samples was set at each temperature condition N = 50. The number of repetitions was set to 30 times. The judgment conditions were as follows: ：: No clogging in all conditions, ：: Total number of clogging occurrences 1 or less, ×: Total number of clogging occurrences 2 or more.

[0025]

According to the powder-containing aerosol composition of the present invention, a jet can be uniformly applied by a mechanical break-up type button without causing clogging of a button portion. Therefore, pain caused by excessive cooling and frostbite Can be prevented.

[Brief description of the drawings]

FIG. 1 is a view showing a state in which contents (composition) are filled in a pressure-resistant container.

FIG. 2A is a view showing a main part of a mechanical break-up button, and FIG. 2B is a view showing IIB in FIG. 2A.
FIG. 2 (c) is a cross-sectional view taken along the line IIB, showing a state in which a spiral groove is cut inside the chip and the jet flows through the groove.

FIG. 3 is a diagram showing a main part of a straight button, and FIG. 3B is a sectional view taken along the line IIIB-IIIB in FIG. 3A.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Expansion chamber outlet 2 Flow path 3 Bending part 4 Injection port 5 Upper part of button 6 Expansion chamber inlet 10 Pressure vessel 11 Contents (composition)

Continued on the front page (51) Int.Cl. ⁶ Identification number Reference number in the agency FI Technical display A61K 9/12 B65D 83/14 F

Claims (1)

[Claims] 1. A powder having a particle size of 1 to 20 μm and a propellant as main components, and the content ratio by weight of powder / propellant = 0.1
１２12 / 80９９99.9 in a container provided with a mechanical break-up type button having a bent portion in a flow path between an internal expansion chamber outlet and a nozzle. Body-containing aerosol composition.