JP2002080805A - Process for bonding adherend to polyolefin resin molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process for easily bonding adherends to polyolefin resin molded products which cannot be directly bonded to polyolefin resin molded products with adhesives. SOLUTION: In the process for bonding adherends to polyolefin resin molded products which cannot be directly bonded to polyolefin resin molded products with adhesives, an adhesive film or a sheet having an adhesive applied onto one side is bonded to the polyolefin resin molded product via the adhesive, and subsequently an adherend such as a porous body, a liquid-impregnated porous body, a gel-form substance, etc., is bonded to the other side of the adhesive film or sheet via an adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for bonding an adherend, which cannot be directly bonded to a polyolefin resin molded product, with an adhesive to a polyolefin resin molded product.

[0002]

2. Description of the Related Art Polyolefin resins such as polyethylene resin and polypropylene resin are used as molding materials in addition to films, sheets, etc., as well as various home appliances such as various containers, tableware, bathroom supplies, refrigerators, washing machines, fans, air conditioners and the like. Widely used for products, automobile parts, building materials, stationery, toys, etc.

[0003] However, in the case of a molded product of a polyolefin resin, since the polyolefin resin does not have polarity, it is generally impossible to directly bond another adherend to be bonded with an adhesive.

[0004] To this end, the surface to be bonded of a polyolefin resin molded product is subjected to a corona discharge treatment or a frame treatment, and then an adhesive is applied to bond the adherend. However, this method has a problem in that the processing is expensive, involves risks, and must be adhered within a certain period of time after the processing.

On the other hand, there is a method in which a primer is applied to a surface to be bonded of a polyolefin resin molded product, and then the adherend is bonded with an adhesive. However, this method is dangerous because a toxic organic solvent must be used, and the effective bonding time after application of the primer is as short as, for example, 10 minutes to 30 minutes.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to solve such problems of the prior art, and it is not possible to directly adhere to a polyolefin resin molded article with an adhesive. It is an object of the present invention to provide a method for easily bonding a body to a polyolefin resin molded article.

[0007]

That is, the present invention relates to a method for bonding an adherend, which cannot be directly bonded to a polyolefin-based resin molded product with an adhesive, to a polyolefin-based resin molded product. After adhering an adhesive film or sheet having an adhesive applied to one surface thereof to a resin-based molded product via an adhesive, bonding the adherend to the other surface of the adhesive film or sheet via an adhesive. This is a method for bonding to a polyolefin resin molded product.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The method of bonding to the polyolefin resin molded product of the present invention is,
This is a method of bonding an adherend that cannot be directly bonded to a polyolefin resin molded product with an adhesive to the polyolefin resin molded product. Specifically, after adhering an adhesive film or sheet having an adhesive applied to one surface to a polyolefin-based resin molded product via an adhesive, the adhesive film or sheet is coated on the other surface of the adhesive film via an adhesive. It is characterized in that the body is bonded.

The molded product of the polyolefin resin used in the bonding method of the present invention includes molded products of polyethylene resin, polypropylene resin and the like. The shape of the molded article is not particularly limited, and examples thereof include films, sheets, and molded articles of various shapes.

The adherend adhered to the polyolefin resin molded article of the present invention is an adherend that cannot be directly adhered to the polyolefin resin molded article with an adhesive, for example, a porous body such as sponge, Examples thereof include a porous body impregnated with a liquid such as water, ink, and paint, a gel-like substance, a rubber-like substance, and a felt-like substance.

FIG. 1 is a schematic view showing an example of a method for bonding an adherend to a polyolefin resin molded article of the present invention.
The present invention is characterized in that an adhesive film or sheet coated with an adhesive on one surface is used for bonding the adherend to the surface of a polyolefin resin molded product. FIG.
(A) shows an adhesive film or sheet. The pressure-sensitive adhesive film or sheet 1 is applied to one side of a film or sheet 2 made of a material effective for bonding with an adhesive, for example, a film or sheet of polyvinyl chloride, polyester or the like, in the same manner as a normal pressure-sensitive adhesive seal. Is applied, and the surface of the pressure-sensitive adhesive is adhered to a separator (release paper) 4 which can be peeled off. The above-mentioned film or sheet 2 and the adhesive 3 alone are half-cut into a predetermined shape and cut along a cutting line 5.
Put in.

The laminate 9 of the film or sheet 2 and the pressure-sensitive adhesive 3 in a predetermined shape of the pressure-sensitive adhesive film or sheet 1 is peeled off from the separator (release paper) 4, and the surface of the polyolefin resin molded product 6 is interposed with the pressure-sensitive adhesive 3. And glue.

Next, an adhesive 7 is applied to the surface of the film or sheet 2 adhered to the polyolefin resin molded product, and the adherend 8 is adhered. (Refer to FIG. 1 (b).) An adherend 8 is adhered to the surface of the polyolefin resin molded product 6 via an adhesive film or sheet 1. (FIG. 1 (c)
reference)

In the present invention, the pressure-sensitive adhesive may be any one that can strongly adhere to a polyolefin resin molded article.
For example, an acrylic adhesive or a rubber adhesive is preferable because of its strong adhesive strength. Either an emulsion-based (water-soluble) or a solvent-based (solvent-based) acrylic pressure-sensitive adhesive can be used. A commercially available pressure-sensitive adhesive film or sheet can be used.

The adhesive is not particularly limited as long as it can firmly adhere the adherend to the film or sheet surface of the pressure-sensitive adhesive film or sheet. For example, an instantaneous adhesive such as a cyano (meth) acrylate-based adhesive is used. It is preferable because it can be firmly bonded in a long time.

In the present invention, since the pressure-sensitive adhesive of the pressure-sensitive adhesive film or sheet is one that can strongly adhere to the polyolefin-based resin molded product, the pressure-sensitive adhesive does not easily peel off from the polyolefin-based resin molded product. By bonding the adherend to the surface of the film or sheet, it is possible to obtain the same adhesive strength as that obtained by applying a corona discharge treatment, a claim treatment, or applying a primer to the surface of a conventional polyolefin resin molded product. .

The bonding method of the present invention is suitable for bonding a porous body, a porous body impregnated with a liquid such as water or ink, or a gel body as an adherend to a polyolefin resin molded article. Yes, if such an adherend is directly bonded to a polyolefin resin molded product with an adhesive, the polyolefin resin molded product cannot be bonded because it does not accept the adhesive. When the adhesive is bonded in a short time with an instant adhesive, the adhesive can easily adhere to even if the adhesive hardly acts on the porous body due to penetration of water or moisture.

[0018]

EXAMPLES The present invention will be specifically described below with reference to examples.

Example 1 A circular sheet surrounded by a cut line of an adhesive sheet (trade name: Super Stick (polyester vapor-deposited product, manufactured by Lintec)) on the surface of a cylindrical molded product of a polypropylene resin, and an adhesive. Was peeled off from the separator (release paper) and attached via an adhesive. Next, a cyanoacrylate-based adhesive was applied to the sheet surface of the pressure-sensitive adhesive sheet to bond the porous body (NBR rubber sponge). The bonding between the molded article and the porous body was performed in a short time, and the bonding was firm.

Example 2 A stamp base was prepared using a main body made of a polyolefin resin molded article and a lid body. Adhesive sheet [Product name: Super Stick (polyvinyl chloride), manufactured by Lintec Co.] is attached to the sheet surrounded by the cutting line on the body (made of polypropylene resin) containing the ink pad impregnated with ink on the stamp stand. The laminate of the agent was peeled off from the separator (release paper) and attached via an adhesive.

Next, a cyanoacrylate adhesive was applied to the sheet surface of the pressure-sensitive adhesive sheet, and an ink pad impregnated with ink was adhered to a sponge. Adhesion between the main body and the ink pad was performed in a short time, and even when there was moisture, the adhesion was strong. Next, a stamp body was formed by detachably fitting the lid body to the main body provided with the ink pad.

[0022]

As described above, according to the bonding method of the present invention, a polyolefin resin molded article is coated with a porous body or a gel body impregnated with a liquid such as a porous body or ink. The attached body can be easily adhered in a short time via the adhesive film or sheet.

In the bonding method of the present invention, the pressure-sensitive adhesive film or sheet is inexpensive, has good workability, and is safer and lower in cost than conventional methods of applying corona discharge treatment, claim treatment, or applying a primer. Can be glued. Further, according to the bonding method of the present invention, it is possible to obtain a stamp base in which an ink pad in which a sponge is impregnated with ink is well bonded to a main body.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one example of a method for bonding an adherend to a polyolefin resin molded article of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Adhesive film or sheet 2 Film or sheet 3 Adhesive 4 Separator (release paper) 5 Cutting line 6 Polyolefin resin molded article 7 Adhesive 8 Adherend 9 Lamination

Claims (5)

[Claims] 1. A method for bonding an adherend, which cannot be directly bonded to a polyolefin resin molded product with an adhesive, to a polyolefin resin molded product, wherein one surface of the adherend is adhered to the polyolefin resin molded product. After bonding the adhesive film or sheet coated with the agent via an adhesive, the adherend is bonded to the other surface of the adhesive film or sheet via an adhesive to a polyolefin resin molded article. Bonding method. 2. The method for bonding to a polyolefin resin molded product according to claim 1, wherein the polyolefin resin molded product is a polyethylene resin or polypropylene resin molded product. 3. The adhesion to a polyolefin resin molded article according to claim 1, wherein the adherend is a porous body, a porous body impregnated with a liquid, a gel-like substance, a rubber-like substance or a felt-like substance. Method. 4. The method according to claim 1, wherein said pressure-sensitive adhesive is an acrylic pressure-sensitive adhesive or a rubber-based pressure-sensitive adhesive. 5. The method according to claim 1, wherein the adhesive is a cyano (meth) acrylate adhesive.