JP3101978B2 - Aerosol composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous aerosol composition used for aerosol products for hobby and the like.

[0002]

2. Description of the Related Art Plasticizers are added to resins such as methacrylic ester resins, acrylic ester resins and their copolymer resins.
A liquefied chlorofluorocarbon composition containing a suitable amount of additives such as silicone oil, liquid paraffin, and higher fatty acid esters as lubricants
12/11, dimethyl ether / liquefied petroleum gas or mixed propellant thereof, or monochlorodifluoromethane (fluorocarbon 22), monochlorodifluoroethane (fluorocarbon 142b)
When the obtained aerosol product is injected into the atmosphere, the propellant evaporates and evaporates immediately, and a flexible composition is ejected from the injection port of the aerosol container, and the string is squeezed. It is formed.

[0003]

Such an aerosol cord composition satisfies the requirements of the dissolving ability of a liquefied propellant, non-toxicity, non-flammability, and appropriate vapor pressure in order to dissolve the resin component. 60/40 of Freon 12/11
~ 95/5 mixed compositions have been used. Non-flammable propellants have been a desirable requirement, especially when considered in large quantities indoors, unlike the environment in which they are used and other aerosols.

However, the use of Freon 12 and Freon 11 has been severely restricted since 1989 as a gas that destroys the ozone layer in the upper part of the earth, and aerosol products using these Freon have been used by boycotts from consumers. In fact, the situation became unusable. Further, in the conventional composition, the resin component is dissolved in Freon 12/11, dimethyl ether / liquefied petroleum gas or a mixed propellant thereof, and is filled in a pressure-resistant container for a long period of several days to several tens of days. It had to be kept stationary. As a result, integrated production was not possible in the production process, which placed a heavy burden on production activities.

[0005]

Means for Solving the Problems A conventional spray of a composition obtained by dissolving a conventional acrylic methacrylate copolymer resin in a regulated fluorocarbon or a combustible liquefied gas is an environmental problem that the ozone layer in the upper part of the earth is destroyed. And the latter is
The danger to fire is extremely high for the user.

The inventors of the present invention have conducted intensive studies to solve the problems of the prior art. As a result, an aqueous aerosol composition comprising an acrylic ester resin, an aqueous solution and an aerosol propellant has been used as an aerosol propellant. An aerosol composition using a propellant comprising 15 to 50% by weight of a liquefied gas serving as a solvent and 50 to 85% by weight of a liquefied gas serving as a poor solvent and containing 15 to 35% by weight of the resin component and 17 to 33% by weight of an aqueous solution Dimethyl ether, as a liquefied gas to be a true solvent
If monochlorodifluoroethane, dichloromonofluoroethane, etc. are used alone or as a mixture, and if liquefied petroleum gas, tetrafluoroethane, monochlorodifluoromethane, etc. are used alone or as a mixture as a liquefied gas to be a poor solvent, they are subject to regulation. Without using CFCs, it was found that the composition could be discharged in a good string form, and could be a composition having safety such that the user could not ignite even if the string was brought into contact with a candle flame or the like, and completed the present invention. Reached.

[0007] In summary, the aqueous aerosol composition of the present invention is obtained by adding water to the composition as a means of making a flame-retardant composition without using a specific fluorocarbon. That is, the aqueous aerosol composition of the present invention is an aqueous aerosol composition comprising an acrylic ester-based resin, an aqueous solution, and an aerosol propellant. In the aerosol propellant, a liquefied gas serving as a true solvent is 15 to 50% by weight and a poor solvent. Liquefied gas 50-85
% By weight of the resin component 15 to 35
% Of an aqueous solution and 15 to 33% by weight of an aqueous solution.

The acrylic ester resin used in the present invention includes a methacryl ester resin, an acrylic ester resin and / or a copolymer resin thereof. As a liquefied gas that becomes a true solvent in the aerosol propellant,
Preferably, dimethyl ether, monochlorodifluoroethane (CFC 142b), dichloromonofluoroethane (CFC 141b) and a mixture thereof are mentioned. As a liquefied gas serving as a poor solvent, preferably a liquefied petroleum gas (LP
G), tetrafluoroethane (Freon 134a), monochlorodifluoromethane (Freon 22) and mixtures thereof.

The aqueous solution used in the present invention is preferably an aqueous solution containing a surfactant, an additive and an alcohol, and particularly preferably an aqueous solution having an alcohol content of 15 to 30% by weight. If the alcohol content is less than 15% by weight, the resin is dry, hard and easily clogged, and if it exceeds 30% by weight, stickiness is large and a string is not formed. As the surfactant used here, for example, polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene ethyl ether, polyoxyethylene hydrogenated castor oil,
Polyoxyethylene alkyl phenyl ether is mentioned, and as an additive, a normal additive, for example, a higher fatty acid ester or a coloring agent as a plasticizer can be appropriately added. Examples of the alcohol include isopropyl alcohol, ethyl alcohol or its denatured alcohol, and butyl alcohol.

In the composition of the present invention, the content of the aqueous solution is 15 to 33% by weight in the composition, and if the content is particularly 30 to 33% by weight, the total amount of the propellant is flammable mixed propellant, Specifically, even with dimethyl ether, liquefied petroleum gas, or monochlorodifluoroethane, it is possible to obtain a flame-retardant cord (which does not ignite even if it comes in contact with a candle flame under certain conditions).

If the blending ratio of the liquefied gas, which is a true solvent in the aerosol propellant, is less than 15% by weight, the resin component does not dissolve, so that a string-like body cannot be obtained. A large, sticky, sticky composition that does not shrink or cut into a continuous string. If the blending ratio of monochlorodifluoromethane (CFC22) exceeds 30% by weight, the vapor pressure is high, and the internal pressure of the aerosol product exceeds 8.1 kg / cm ² gauge pressure at 35 ° C. Touch low.

[0012] When the blending ratio of the resin component in the composition of the present invention is less than 15% by weight, the stickiness is not so large as a string, and when it exceeds 35% by weight, a dry and hard string is formed, and the string is scattered. Absent. When the mixing ratio of the aqueous solution is less than 15% by weight, the composition becomes a dry and hard composition, and the string is easily cut finely. When it exceeds 33% by weight, the composition becomes a wet and soft composition, and the string is cut and continuous. Can not be obtained.

In the composition of the present invention, the mixing ratio of the aerosol propellant is preferably 40 to 70% by weight. If the compounding ratio of the aerosol propellant is less than 40% by weight, it becomes a dry and hard string, but the flight distance is short, the aerosol nozzle is easily clogged, and if it exceeds 70% by weight,
It becomes a wet and soft composition and does not form a continuous string.

The aqueous composition is prepared by dispersing a resin component in an aqueous solution containing a surfactant and an appropriate amount of a plasticizer, filling the resultant in a pressure-resistant container, and then filling the propellant with the resin component being immediately dissolved in the propellant. Further, the propellant is emulsified and dispersed in the aqueous solution. Compared to the conventional method, the dissolution time of the resin is extremely short, that is, 2 to 3 hours, and an integrated production has become possible.

[0015] Adding water to the composition can reduce the composition.
At the same time as softening and imparting action as a lubricant
Fire when aerosol products are injected into the atmosphere
It has the effect that it is difficult to ignite even if it comes into contact with flame or cigarette fire.
You. And the alcohol in the composition is soluble in the resin component
Work to add resin to the resin, strengthen and maintain the string shape.
There is a business. Aerosol composition used alternative Freon 134a
Lowers the internal pressure of aerosol products to meet internal laws
 (8.1kg / cm at 35 ℃ ^TwoGauge pressure).
Yes, so its solubility in resin is lower than that of CFC22
However, a string cannot be obtained even if released into the atmosphere. Moderate
In order to obtain a stringy material that is flexible and dry without stickiness
A propellant composition with a low boiling point and good solvent release is required.
is there.

The above problems have been solved by the present invention.

[0017]

The present invention will be described more specifically below with reference to examples and comparative examples. Examples 1 to 5 and Comparative Examples 1 to 3 Tables 1 and 2 show Examples 1 to 5 of the present invention, conventional products and Comparative Examples 1 to 3.

[0018]

[Table 1]

[0019]

[Table 2]

1) Polyoxyethylene lauryl ether 2) ◎: continuous good cord-like discharge, ：: cord-like discharge with a little lack of continuity, ×: not discharge in a cord-like form 3) ◎: 50 cm from fire source Does not ignite,
○: Not ignited even when approaching 100cm from the fire source, ×:
Ignite even 150cm away from fire source

[0021]

According to the aerosol composition of the present invention, it is safe against fire and a good cord can be obtained.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C09K 3/30 C08J 9/12-9/14 C08L 33/04-33/16

Claims (4)

(57) [Claims] 1. An aerosol aqueous composition comprising an acrylic ester resin, an aqueous solution having an alcohol content of 15 to 30% by weight, and an aerosol propellant, a liquefied gas serving as a true solvent as an aerosol propellant, 15 to 50% by weight. An aqueous aerosol composition comprising a propellant comprising 50 to 85% by weight of a liquefied gas serving as a poor solvent and containing 15 to 35% by weight of the resin component and 15 to 33% by weight of the aqueous solution. 2. The aqueous aerosol composition according to claim 1, wherein the acrylic ester resin is a methacrylic ester resin, an acrylic ester resin and / or a copolymer resin thereof. 3. The liquefied gas serving as a true solvent in the aerosol propellant is dimethyl ether, monochlorodifluoroethane and / or dichloromonofluoroethane, and the liquefied gas serving as a poor solvent is liquefied petroleum gas, tetrafluoroethane and / or monochlorodifluoromethane. The aqueous aerosol composition according to claim 1, which is: 4. The aqueous aerosol composition according to claim 3, wherein the liquefied gas serving as a poor solvent contains 30% by weight or less of monochlorofluoromethane in the propellant.