JPH0487968A - Aerosol container - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an aerosol container made of a synthetic resin, and more particularly to an aerosol container made of a synthetic resin that has excellent pressure resistance, heat resistance, chemical resistance, etc.

[Conventional technology]

Previously known aerosol containers were made of metal such as tin or aluminum, but in recent years, synthetic resin aerosol containers have finally been used, and synthetic resins such as polyester or polyacrylonitrile are now being used as materials. It was.

However, since polyester has poor heat resistance and weldability, it is necessary to make the wall thickness of the container sufficiently thick, and there are also many restrictions on the shape, so it is necessary to manufacture containers that look good and are made entirely of polyester. Therefore, even if the main body was made of polyester, it was necessary to use a metal stopper and wrap it around the mouth of the container to form the container. For this reason, only a very small amount of this type of container has been commercialized.

On the other hand, high nitrile resin has excellent weldability and
Because it has excellent gas barrier properties and chemical resistance, it can be suitably used as a raw material for aerosol containers, and the problem with this resin is that it has poor heat resistance and impact resistance. .

[Problem that the invention seeks to solve]

Conventional aerosol containers made of synthetic resin like this do not have any practical problems, but for safety reasons, they do not have pressure resistance even at high temperatures.
It is desirable to further improve heat resistance and impact resistance. In particular, when the container body is enlarged to increase its internal capacity, it is effective to increase the container wall thickness or provide a partition wall inside to ensure the necessary mechanical strength.

However, if the container wall thickness is increased or a partition wall is provided inside the container, the internal volume becomes smaller than the external appearance, and there is a problem that the metal container cannot be filled with the contents.

[Means to solve the problem]

As a result of intensive studies to solve the above problems, the present inventors have found that the present invention increases the internal volume as much as possible, and
It has been found that an aerosol container with excellent pressure resistance, heat resistance, impact resistance, chemical resistance, etc. can be obtained.

The aerosol container according to the present invention is an aerosol container that is airtightly integrated with a synthetic resin container body and a synthetic resin stopper welded to the opening, and the container body has two layers. It is characterized in that the outer layer of the container body is made of polycarbonate, and the inner layer is made of high nitrile resin, and more preferably, the stopper also includes:
This is an aerosol container made of high nitrile resin.

The polycarbonate resin used in the present invention has the general formula ~ 3 (wherein R and R' are independently hydrogen, carbon number 1-3)
about 10 alkyl groups or phenyl groups, X and Y are independently alkyl groups having 1 to about 10 carbon atoms, chlorine, bromine or hydrogen, and p and r are independently O to 4. ) is a polymer having a repeating unit represented by

These polycarbonate resins are produced by solvent methods, for example, reaction of dihydric phenol with phosgene or ester of dihydric phenol with diphenylcarbonate-1 in the presence of an acid acceptor and a molecular weight regulator in a solvent such as methylene chloride. It can be produced by exchange reaction.

As dihydric phenols that can be particularly preferably used here,
2,2-his(4-hydroxyphenyl)propane (bisphenol A), bis(4-hydroxyphenyl)methane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 2,2- (35, 3', 5'-
Examples include tetrachloro-4,4-dihydroxydiphenyl)propane, 2,2-(3,5,3', 5°-tetrabromo-4,4-dihydroxydiphenyl)propane, and the like. Particularly preferred is (hisphenol A).

The polycarbonate resin may be a homopolymer or a copolymer of two or more of these dihydric phenols, or a mixture thereof.

The high nitrile resin used in the present invention is a copolymer mainly composed of unsaturated nitrile compounds such as acrylonitrile and methacrylonitrile, and contains 50% by weight or more, preferably 55% by weight or more of unsaturated nitrile compound units. .

Comonomers include styrene, butadiene, isoprene, methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, etc.
One or more of these are copolymerized with an unsaturated nitrile compound.

In addition, as a high nitrile resin, rubbery copolymers such as butadiene-acrylonitrile copolymer, butadiene-styrene copolymer, isoprene-styrene copolymer, polybutadiene, polyisoprene, etc. are mixed so as to form the above-mentioned unsaturated nitrile units. Examples include those obtained by copolymerizing a mixture of an unsaturated nitrile compound and the above comonomer in the presence of these rubbery copolymers. These resins are particularly recommended because of their impact resistance.

The high nitrile resin may further include a rubber-like polymer as described above, which has a matrix of a copolymer of an unsaturated nitrile compound and the above-mentioned comonomer, and has a graft portion having a composition similar to that of the 7trix or is compatible with it. Mixtures of polymers and the seven trixes may also be used.

The polycarbonate resin and high nitrile resin used in the present invention include antioxidants, ultraviolet absorbers, antistatic agents, lubricants,
Inorganic fillers, glass fibers, carbon fibers, colored pigments, etc., and small amounts of other resins may also be included.

Methods for manufacturing the double-structured container body of the present invention include multilayer blow molding, multilayer injection blow molding, and multilayer injection molding. It can be manufactured by molding into various shapes. From the viewpoint of moldability, a method of obtaining a two-layer molded product by injection molding the inner layer and then injection molding the outer layer, such as a double injection molding method, is suitable. In addition, in order to increase interlayer adhesion,
An adhesive layer may be provided between the outer layer and the inner layer.

The plug body of the container according to the present invention is made of Takajil-Ril resin, and the plug body and the inner layer of the container body made of Takajil-Ril resin are welded and airtightly integrated. Get a container.

The methods of welding the stopper and the container body include ultrasonic welding,
There are high frequency welding, spin welding, etc.

When a metal stopper is used, the stopper is attached to the container body by wrapping it tightly. At this time, it is advisable to provide a flange or the like on the stopper mounting portion of the container body in order to securely attach the stopper.

Hereinafter, an example of the aerosol container of the present invention will be explained with reference to the drawings.

Figure 1 shows ~7 of the aerosol container according to the present invention. It is a figure showing one example.

The container main body consists of an outer layer I and an inner layer 2, and a stopper 3 is welded to the inner layer 2 to form a container by integrating the container in an airtight manner.

It should be noted that the stopper 3 may be equipped with parts as a normal injection device or parts such as a dip tube for sucking up the liquid content, which are omitted in FIG. 1 because they are not important to the present invention.

In the present invention, a high nitrile resin with excellent chemical resistance and gas barrier properties is used for the inner layer of the container body and the stopper to prevent the contents from penetrating through the container wall and being reduced in weight. The outer layer 1 of the container body made of polycarbonate resin, which has excellent heat resistance, impact resistance, etc., maintains the properties of the container, such as heat resistance and impact resistance, which cannot be maintained by other methods.

The thickness of the outer layer 1 and the inner layer 2 is not particularly limited, or the outer layer 1 is 0.5
-2.5 mm, preferably 0.5-1.5 mm, the inner layer 0.5-2 mm, preferably 0.5-1.5 mm.

〔Example〕

The present invention will be explained below with reference to Examples.

Example 1 100 parts by weight of a monomer composition consisting of 75 parts by weight of acrylonitrile and 25 parts by weight of methyl acrylate were polymerized in the presence of 10 parts by weight of butadiene-acrylonitrile rubbery copolymer (70 parts by weight of butadiene). A high nitrile resin (acrylonitrile content 70% by weight, based on nitrogen analysis) was obtained.

Using this high nitrile resin and polycarbonate resin Panlite L-1225L (manufactured by Kijin Kasei Ltd.), a two-layer injection molding machine manufactured by Mekushi Resin Kogyo Ltd. was used to mold containers in which the inner layer is a high nitrile resin and the outer layer is polycarbonate. I got the main body.

The resulting container had a rectangular cross section with a width of approximately 3.5 cm and a thickness of approximately 3 cm at the center, a height of approximately tocm, and an internal volume of approximately 75 cc. Also, the thickness of the outer layer is approximately 1.2mm
, the thickness of the inner layer was about 1 mm.

A plug was also obtained by injection molding using this high nitrile resin.

Add a mixture of 50% by weight of water and ethanol to the container body, use LPG to make the internal pressure 2.5 kg/cm2, and ultrasonically weld the stopper with the injection device parts assembled to the container body. Sealed.

Prepare 10 pieces like this and leave them at 55°C, which is the test temperature for plastic gas lighters, for one month.
The presence or absence of deformation was observed. As a result, the deformation at the center of the container body was 0.5 mm, which was extremely small.

Moreover, when this container was cut and the inner layer was observed, no abnormalities such as cracks were observed.

Furthermore, 10 pieces prepared separately were tested to a height of 1.5 at room temperature according to the test method for plastic gas lighters.
It was repeatedly dropped from m to concrete 1 board three times, but no damage was observed in either case.

Example 2 100 parts by weight of a monomer composition consisting of 80 parts by weight of acrylonitrile, 5 parts by weight of methyl acrylate, and 15 parts by weight of styrene in the presence of 10 parts by weight of a butadiene-acrylonitrile rubbery copolymer (70 parts by weight of butadiene) High nitrile resin (acrylonitrile content 73% by weight)
, by nitrogen analysis).

A container was molded in the same manner as in Example 1, except that this high nitrile resin was used for the inner layer of the container body, and the polycarbonate resin Lexan 121 (engineering plastic (manufactured by Kiki) was used for the outer layer of the container body. was filled, the container was sealed, and the same test as in Example 1 was conducted.

As a result of the test, the deformation in the center of the container body was 0.5 mm.
And it was extremely small.

Moreover, no abnormalities such as cracks were observed in the inner layer. Furthermore, no damage was observed in the drop test.

Comparative Example 1 A container having the same shape as in Example 1 was molded, except that nylon 66 (Amilan CM3001N (manufactured by Toshimen)) was used for the outer layer, and the same tests were conducted.

As a result of the test, the deformation at the center of the container body was 2.1 mm.
The deformation was also observed visually.

In addition, cracks were observed in the inner layer in 10 out of 10 pieces.

No damage was observed in the drop test.

Comparative Example 2 In Example 2, the outer layer was made of ABS Santac U6.
2 (Mitsui Toatsu Kagaku (manufactured by Kiki)) A container having the same shape as in Example 2 was molded, and the same test was conducted.

As a result of the test, the deformation in the center of the container body was 1.5 mm.
The deformation was also observed visually.

In addition, cracks were observed in the inner layer in 10 out of 10 pieces.

No damage was observed in the drop test.

Comparative Example 3 In Example 2, except that only high nitrile resin was used, a single-layer container having the same shape as in Example 2 and having a thickness of about 2.2 mm was molded, and the same tests as in Example 2 were carried out. went.

As a result of the test, the deformation in the center of the container body was 4.5 mm.
Yes, and deformation was also observed visually.

In addition, small cracks were observed in the inner layer in some of the IO cases, but they did not cause the contents to leak. In addition, in the drop test, 2 out of 10 pieces were found to be damaged after the 20th to 28th drop.

〔Effect of the invention〕

Since the aerosol container of the present invention has a double-layered container body and an inner layer made of high nitrile resin, it has excellent chemical resistance, gas barrier properties, etc., and can be suitably used as an aerosol container.

Furthermore, since the outer layer of the aerosol container of the present invention is made of polycarbonate resin, the aerosol container has excellent heat resistance, impact resistance, etc., and furthermore, there is no need to provide a partition wall inside the container to maintain pressure resistance. The internal volume does not decrease because of this.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of the aerosol container of the present invention. ■...Outer layer of the container body 2...Inner layer of the container body 3...Plug body

Claims (6)

[Claims] (1) An aerosol container in which a synthetic resin stopper is welded to the opening of a synthetic resin container body and integrated in an airtight manner, and the container body has a two-layer structure, an inner and outer layer, and the outer layer An aerosol container characterized in that the inner layer is made of polycarbonate resin and the inner layer is made of high nitrile resin. (2) The aerosol container according to claim 1, wherein the stopper is also made of high nitrile resin. (3) The aerosol container according to claim 1, wherein the stopper is made of metal. (4) The aerosol container according to claim 1, wherein the body trunk is cylindrical. (5) The aerosol container according to claim 1, wherein the main body has a rectangular cylindrical shape. (6) The aerosol container according to claim 1, wherein the main body trunk has an elliptical cylindrical shape.