JPS6264740A - Tubular vessel filled with liquefied silicone rubber - 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 [Industrial Application Field] The present invention relates to a sealed package of uncured liquid silicone rubber used as a sealant, adhesive, etc., that is, a tube-shaped product filled with liquid silicone rubber. It concerns containers.

[Prior art] The method of extruding the required amount of uncured liquid silicone rubber filled in a tube-shaped container and using it as a sealant or adhesive is as follows. It is widely used for room-temperature-curing silicone rubbers such as acetic acid type, oxime type, and alcohol type silicone rubbers that cure with moisture.

However, the tube-shaped container filled with the uncured liquid silicone rubber must have sufficient gas barrier properties and the liquid silicone rubber contained therein will not deteriorate due to contact with the inner wall surface of the tube-shaped container. Because such properties are required, a tubular container is used which has a container body made of a cylindrical body made of aluminum foil.

[Problem to be Solved by the Invention 1] By the way, a tubular container filled with liquid silicone rubber, which is a sealed package of a tubular container having a container body made of a cylindrical body made of aluminum foil, has the following problems: The uncured liquid silicone rubber filled in the tube-shaped container has low fluidity when force is applied, so extrusion is not smooth, and the liquid silicone rubber in the tube-shaped container is consumed to the extent that it is After the liquid silicone rubber is pressed for extrusion, the liquid silicone rubber tends to move toward the sealing part at the bottom of the container, and pressure is applied to the bottom of the container, which may even cause the core to burst.

In contrast, in the present invention, it is easy to extrude and squeeze out the liquid silicone rubber that is the inner filling, the seal at the bottom of the container does not burst, and the liquid silicone rubber that is the inner filler can be easily squeezed out of the container. It is possible to provide a tube-shaped container filled with uncured liquid silicone rubber, which is a sealed package having properties such as stability against the inner wall surface.

[Means for Solving the Problems] The tubular container filled with the liquid silicone rubber of the present invention is joined to the open end of the container body, like conventional tubular containers of this type. A head made of synthetic resin,
It consists of a cap that closes the spout formed in the head, and a container body filled with liquid silicone rubber as an inner filler, and the container body has a low-density polyethylene film layer/ polyester.

It is composed of a cylindrical packaging material made of a four-layer adhesive laminated sheet consisting of a biaxially stretched polypropylene or polyamide film layer/aluminum foil/medium to high-density polyethylene film layer. In the cylindrical packaging material made of the four-layered adhesive laminated sheet, the medium to high-density polyethylene film layer side of the adhesive laminated sheet becomes the inner surface of the tubular container, and the low-density polyethylene film layer side becomes the outer surface. It is formed as follows.

The tube-shaped container filled with the liquid silicone rubber of the present invention having the above structure is characterized by the structure of the packaging material made of the adhesive laminated sheet that constitutes the container body.

The laminated structure of the packaging material will be explained below.

The adhesive laminated sheet constituting the container body of the tubular container filled with the liquid silicone rubber of the present invention has a first layer composed of a low-density polyethylene film, a biaxially oriented polyester film, a biaxially oriented polyester film, and a biaxially oriented polyester film. A second layer made of oriented polypropylene film or biaxially oriented polyamide film, and a third layer made of aluminum foil.
and a fourth layer composed of a medium to high density polyethylene film. The first layer in the adhesive laminated sheet gives the tube-shaped container an orderly appearance, and the first layer is coated with a treatment to improve adhesion such as corona discharge on the surface and is then printed with beautiful printing. Common. Further, the second layer in the adhesive laminated sheet maintains the strength of the container body of the tubular container. Furthermore, the third layer in the adhesive laminated sheet provides gas barrier properties to the tube-shaped container, and also prevents heat generation when forming a seal portion using high-frequency sealing when forming the container body with this adhesive laminated sheet. It has the function of a source.

The fourth layer of the adhesive laminated sheet is a layer that exhibits stability against the uncured liquid silicone rubber contained within the tube-shaped container, and at the same time, the adhesive laminated sheet forms the body of the container. It is a layer that has suitability for welding and sealing with the above-mentioned first layer at the overlap welding part when forming a tube-shaped container, and suitability for adhesion between the container body and the synthetic resin head when forming a tubular container. be. Incidentally, if this fourth layer is composed of a low density polyethylene film,
The stability of the inner surface of the container against the uncured liquid silicone rubber contained within the tubular container is poor, and the inner peripheral surface of the packaging material that makes up the container body swells due to contact with the liquid silicone rubber. Otherwise, stress cracks may occur in the packaging material.

The adhesive laminated sheet with the above-mentioned laminated structure is formed by sequentially adhering ready-made synthetic resin films and aluminum foils with an adhesive, but from the viewpoint of obtaining excellent adhesive strength, for example, epoxy adhesive is used. Adhesive laminated sheets using polyester-polyurethane adhesives, which have a polyester resin having a hydroxyl group at the end as a main ingredient and are cured with an aliphatic isocyanate, are preferred. In particular, between the third layer and the fourth layer, that is, between the aluminum foil and the medium to high density polyethylene film layer, a polyester resin having a hydroxyl group at the terminal is used as the main ingredient,
In the case of an adhesive laminated sheet that is bonded with a polyester/polyurethane adhesive that is cured with aliphatic isocyanate, it goes without saying that excellent adhesive strength can be obtained between the third and fourth layers as described above. However, since the polyester polyurethane adhesive has extremely excellent stability against the uncured liquid silicone rubber used as the inner filler and its crosslinking agent, for example, it may be present in the fourth layer. Even if the liquid silicone rubber filling material or its crosslinking agent penetrates into the adhesive layer through the pinhole, this will cause deterioration of the adhesive layer and lead to delamination. This prevents things like
Particularly preferred.

The tubular container filled with the liquid silicone rubber of the present invention is obtained by cutting the adhesive laminated sheet described above into a predetermined shape, overlapping and welding a pair of end sides, and then obtaining the cylinder body. A separate head made of synthetic resin is joined to one open end of the cylindrical body, and the spout formed in the head made of synthetic resin is closed with a cap. Filled with liquid silicone rubber from one open end, and after filling is completed, the liquid silicone rubber filling port is welded and sealed, and the edges of the adhesive laminated sheet are overlapped.

High frequency welding and thermal welding are used for welding to obtain the cylinder, joining the cylinder to the synthetic resin head, and sealing the filling port after filling the liquid silicone rubber. be done.

[Example] Hereinafter, a specific structure of a tubular container filled with the liquid silicone rubber of the present invention will be described based on drawing examples.

Example 1 The adhesive laminated sheet indicated by the symbol l in FIG.
A first layer 3 made of a milky white low density polyethylene film (filler titanium dioxide) having a thickness of 100 JL and having a printed pattern 2 formed on its surface, and a first layer 3 having a thickness of 12. A second layer 4 made of a biaxially oriented polyester film of It is a packaging material constituting a cylindrical body 10 that becomes the body of a tube-shaped container.

The adhesive laminated sheet having the above structure was cut into a substantially rectangular shape, a pair of end sides were overlapped, and the overlapped portion was high-frequency welded to obtain a cylindrical body indicated by the symbol IO in FIG. 2.

Next, the obtained cylindrical body 10 is inserted into an injection mold, and injection molding is performed using a titanium dioxide-containing high-density polyethylene resin as a raw material for injection molding, resulting in a synthetic resin indicated by reference numeral 20 in FIG. A resin head was obtained, and a welded assembly of the injection molded synthetic resin head 20 and the cylindrical body 10 was also obtained. The head 20 is made of synthetic resin and is an injection molded body of high-density polyethylene resin containing titanium dioxide.
It is an integrally molded body composed of a spout 22 having a thread 21 formed on its outer peripheral surface, a truncated conical shoulder portion 23, and a skirt portion 24.

The lower part of the shoulder part 23 and the skirt part 24 in the head part 20
The outer circumferential surface of the cylindrical body 10 is welded to one inner circumferential surface of the cylinder lO.

Thereafter, a cap 30 that closes the spout 22 is screwed on using the thread 21 formed on the outer peripheral surface of the spout 22, and the open end that forms the bottom of the cylinder 10 is then screwed on. A predetermined amount of oxime type liquid silicone rubber TS
E 382-C [colorless translucent, Toshiba Silicone Corporation
After filling the container with a liquid silicone rubber, the open end is closed by high-frequency welding to form a tubular container which is an embodiment of the present invention, that is, a liquid silicone rubber indicated by reference numeral 40 in FIG. 3. Tubular container filled with [A]
I got it. In addition, in Fig. 3, the part indicated by numeral 11 is the weld line formed after filling the liquid silicone rubber.
The part indicated by the reference numeral 10A is the container body.

In addition, another example liquid silicone rubber was prepared by filling an acetic acid type liquid silicone rubber TSE370-C [colorless and translucent, manufactured by Toshiba Silicone Corporation: trade name] into a tube-like container having the same structure as the one described above. A tubular container [B] filled with alcohol-type liquid silicone rubber TSE 392-W [white, manufactured by Toshiba Silicone Corporation: trade name], which is another example product, is filled with liquid silicone rubber. Tubular container [C]
I got this.

Example 2 The second layer of the packaging material constituting the container body of the tubular container [A] of Example 1 was made of a 12 #L thick biaxially stretched polyester film instead of a 12 JJ- thick biaxially stretched polyester film. A tubular container [D] filled with liquid silicone rubber, which is an example product of the present invention, was obtained, which had the same structure as the tubular container [A] except that it was made of a polypropylene film.

Example 3 The second layer of the packaging material constituting the container body of the tubular container of Example 1 [AI] was made of a biaxially stretched polyester film having a thickness of 1271 mm instead of a biaxially stretched polyester film having a thickness of 12 IL. A tubular container [E] filled with liquid silicone rubber, which is an example product of the present invention, was obtained, which had the same structure as the tubular container [AI] except that it was made of a polyamide film.

Example 4 The tubular container of Example 1 [the fourth layer of the packaging material constituting the container body of AI was made of a high-density polyethylene film with a thickness of 8100 g instead of a medium-density polyethylene film with a thickness of ff 100 g. A tubular container [F] filled with liquid silicone rubber, which is an example product of the present invention, was obtained which had the same configuration as the tubular container [AI] except for the following.

In addition, another example product, liquid silicone rubber, was filled with acetic acid type liquid silicone rubber TSE370-C [colorless and translucent, manufactured by Toshiba Silicone Co., Ltd., trade name 1, in a tubular container having the same structure as the one described above. A tubular container [G1 was obtained.

Comparative Example 1 The tubular container of Example 1 [the fourth layer of the packaging material constituting the container body of AI was composed of a 100 μm thick polypropylene film instead of the 8100 μm thick medium density polyethylene film. Except for the above-mentioned tube-shaped container [A tubular container filled with liquid silicone rubber for comparison having the same configuration as AI [Hl was obtained].

Comparative example? The tubular container of Example 1 [AI container (the fourth layer of the packaging material constituting the body was replaced with a medium density polyethylene film having a thickness of 1 oop and a thickness of 8
A tubular container [J] filled with liquid silicone rubber was obtained for comparison, which had the same structure as the tubular container [AI] except that it was composed of 100 g of low-density polyethylene film.

Experiments Tubular container filled with liquid silicone rubber which is an example product of the present invention described above [A] Tubular container filled with rubber [Hl].

□ 10 bottles each of ゝ~[G] and liquid silicone [J] for comparison were placed in an atmosphere at a temperature of 40°C and a relative humidity of 90%. Monthly,
After leaving the tubular containers' [Hl and [J] for 5 weeks, [1] the cap was removed and the filling was extruded from the spout, and the appearance, curability, and physical properties of the liquid silicone rubber after curing were evaluated. Observed [)1] The container chest of the tube-shaped container was cut transversely near the center, and the condition of the packaging material in the container body and the condition of the liquid silicone rubber as the inner filling were observed. [iiD tube After extruding the liquid silicone rubber filling in the container, the container body was cut open and the laminate strength between the third and fourth layers of the sample was measured at a tensile speed of 300 m layer/in.

Measurement was made under the condition of width 15 pus.

Branch ILLI Encounter Division 1 Tubular containers [A] to [G] and [Hl].

There was no abnormality in any of [J].

1 vine 1 bean 1 section No abnormality was observed in any of the tube-shaped containers [A] to ['G], but the tube-shaped containers [T (
] and [J], both occurred on the pupil side in the fourth layer.

Shisako [Division L1 [Operations and Effects of the Invention] The tubular container filled with the liquid silicone rubber of the present invention has low fluidity when the filling in the container is subjected to force; Since the container body of the tube-shaped container is rigid, extrusion is smooth, and even after the uncured liquid silicone rubber in the container has been consumed to some extent, pressing for extrusion can be performed easily. This has the effect that the filling material does not move to the sealing part at the bottom of the container, and good extrusion can be carried out to the end.

In addition, in the tube-shaped container filled with the liquid silicone rubber of the present invention, the laminated sheet which is the material constituting the container body has an outer layer composed of a low-density polyethylene film layer, and an inner layer in contact with the filling material. is composed of a medium-density polyethylene film layer, so it is possible to weld and join the low-density polyethylene film layer and the medium to high-density polyethylene film layer at the overlap welding part when forming the cylinder that will become the container chest, and to The medium-density polyethylene film layers forming the bottom of the part can be welded together smoothly, and have excellent stability against the liquid silicone rubber used as the filling material.

Furthermore, in the tubular container of the present invention, aluminum foil having excellent gas barrier properties is interposed in the laminated sheet constituting the container body. It is possible to completely avoid the effects of moisture, which has an adverse effect on rubber.

[Brief explanation of drawings]

FIG. 1 is an enlarged cross-sectional view of a model showing one example of the adhesive laminated sheet constituting the container body of the tubular container of the present invention;
The figure is an enlarged cross-sectional view of a model illustrating an example of a joined state of the container body and the head made of synthetic resin of the tubular container of the present invention, and FIG. 3 is a front view of the tubular container of the present invention. l: Adhesive lamination sheet I, 3: Low density polyethylene film layer, 4: Biaxially stretched film layer of polyester, polypropylene, or polyamide, 5 Ni aluminum foil, 6
: Medium to high density polyethylene film layer, 20: Synthetic resin head, 10A: Container body, 30: Cap, 40:
A tubular container filled with liquid silicone rubber.

Claims (3)

[Claims] (1) Consisting of a container body, a synthetic resin head joined to the open end of the container body, and a cap that closes the spout formed in the head, and In a tubular container filled with liquid silicone rubber, the container body is composed of a low density polyethylene film layer/a biaxially stretched film layer of polyester, polypropylene, or polyamide/aluminum foil/a medium to high density polyethylene film layer. A liquid container comprising a cylindrical body made of a four-layer adhesive laminated sheet packaging material such that the medium density polyethylene film layer side of the packaging material becomes the inner surface of the tubular container. A tubular container filled with silicone rubber. (2) The adhesive that adheres the aluminum foil and the medium to high density polyethylene film layer in the four-layer adhesive laminate sheet is a polyester resin whose main ingredient is a polyester resin with hydroxyl groups at the end, which is cured with an aliphatic isocyanate. A tubular container filled with the liquid silicone rubber according to claim 1, which is a polyurethane adhesive. (3) An adhesive for bonding a low-density polyethylene film layer and a biaxially stretched film layer of polyester, polypropylene, or polyamide in a four-layer adhesive laminate sheet; and a biaxially stretched film layer of polyester, polypropylene, or polyamide. The adhesive used to bond the aluminum foil to the aluminum foil is an epoxy adhesive or a polyester/polyurethane adhesive which is made of a polyester resin having a hydroxyl group at the end and is cured with an aliphatic isocyanate. A tubular container filled with the liquid silicone rubber according to item 2.