JPH0217593B2 - - Google Patents

Description

[Detailed description of the invention]

OBJECT OF THE INVENTION (Field of Industrial Application) The present invention relates to a molding attached to the body, bumper, etc. of an automobile, and more specifically to a resin molding having a tape attached to the back surface thereof. (Prior Art) Moldings made of synthetic resin or synthetic rubber are attached to the bodies and bumpers of automobiles. The base material for the above molding is generally vinyl chloride resin or EPDM (ethylene-propylene-
Polyolefin-based vulcanized rubbers such as diene ternary copolymer rubber) and EPM (ethylene-propylene copolymer rubber) are used. A molding that is attached to the side of the body and has the function of preventing scratches caused by contact with other objects when opening a door, etc., and also has a decorative function is called a side protection molding.It is a tape coated with adhesive or adhesive. It is now attached to the body etc. using so-called double-sided tape. In other words, by adopting a method of attaching the molding base material to the body etc. via tape, the installation work is simplified, and since there is no need to drill holes in the body, there is an advantage that rust does not occur. It is. As the base material of the tape, a sponge made of polyethylene, acrylic rubber, chloroprene rubber, etc. formed into a thin plate, nonwoven fabric, film, paper, etc. are used. In addition, the adhesive applied to the surface of the tape may be an acrylic composition whose main component is an acrylic resin such as butylene acrylate, butyl methacrylate, or 2-ethylhexyl acrylate, or a chloroprene composition whose main component is polychloroprene. The composition is common. (Problem to be solved by the invention) However, since polyolefin polymers such as EPDM, EPM, and polyethylene do not contain polar groups in the main chain of their molecules, they cannot be coated with paint, adhesive, pressure-sensitive adhesive, etc. on the surface. It is known that even when applied, the adhesion of the resulting coating film is insufficient. Therefore, even if the molding base material and the tape are bonded together using adhesive or pressure-sensitive adhesive, if either the molding base material or the tape is made of polyolefin polymer, the problem is that the adhesion is insufficient. There is a point. In addition, when the molding base material made of vinyl chloride resin is attached to a body etc., due to temperature differences between day and night, and between summer and winter,
The base material repeatedly contracts and expands. The base material shrinks due to volatilization of the low molecular weight compound in the resin. Due to the interaction of heat, light, moisture, etc., the plasticizers and stabilizers in the resin decompose and become low molecular weight, which evaporate into the air, causing the base material to shrink. It has been pointed out that due to various factors such as these, the adhesion of the adhesive (or pressure-sensitive adhesive) applied between the molding base material and the tape decreases. As a result of repeated research aimed at solving the above problems, the present inventor discovered a composition that has strong adhesion to resin moldings made of EPDM, vinyl chloride resin, etc., or tapes made of polyethylene, etc. As a result, the present invention has been achieved. Structure of the Invention (Means for Solving Problems) The present invention comprises a molding base material and a tape attached to the back surface of the molding base material, and a polyacrylic acid derivative is provided between the back surface of the molding base material and the tape. and/or a molding characterized in that it is coated with an adhesive prepared by mixing 100 parts by weight of a polymethacrylic acid derivative with 1 to 50 parts by weight of acrylonitrile. (Function) By coating and forming an adhesive made of the above composition between a base material made of polyolefin polymer or vinyl chloride resin and the tape, the mall base material -
Since the adhesion between the tapes is significantly strengthened, if this tape is attached to an automobile body or bumper, it will be difficult to peel off even after long-term use. [First Embodiment] As shown in Fig. 1, the mall of this embodiment has the following features:
It is composed of a molding base material 1a made of EPDM, a tape 3a made of a 5-fold foam of chloroprene rubber, and an adhesive 2 coated between the molding material 1a and the tape 3a. The molding base material 1a made of the above EPDM is shown in Table-1.
It was manufactured by extruding EPDM having the composition shown in the figure below and then vulcanizing it at 200°C for 5 minutes.

[Table] The above adhesive 2 is a polyacrylic acid derivative and/or
Alternatively, it is a composition in which 1 to 50 parts by weight of acrylonitrile are mixed with 100 parts by weight of a polymethacrylic acid derivative. If the amount of acrylonitrile is less than 1 part by weight, the intermolecular cohesive force will be weak due to poor polarity, and the adhesive force of the adhesive will be reduced. Moreover, if it exceeds 50 parts by weight, the intermolecular cohesive force will be too strong, and interfacial peeling between the adhesive and the adherend will easily occur. Next, as the above-mentioned polyacrylic acid derivatives, methyl acrylate, ethyl acrylate, n-butyl acrylate, iso-butyl acrylate, 2-
Ethylhexyl acrylate, indecyl acrylate, 2-hydroxyethyl acrylate, 2
Examples include homopolymers of hydroxypropyl acrylate, glycidyl acrylate, and dimethylaminoethyl acrylate. In addition, as polymethacrylic acid derivatives, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, iso-butyl methacrylate,
Examples include homopolymers of 2-ethylhexyl methacrylate, isodecyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, glycidyl methacrylate, and dimethylaminoethyl methacrylate. In order to produce this adhesive, it is sufficient to simply mix the above-exemplified polyacrylic acid derivative and/or polymethacrylic acid derivative and acrylonitrile in the above-mentioned predetermined ratio in an organic solvent. The organic solvents used are saturated hydrocarbons such as n-hexane and cyclohexane; benzene, toluene,
Aromatic hydrocarbons such as xylene; ethers such as dioxane and tetrahydrofuran; acetate esters such as ethyl acetate and propyl acetate; ketones such as acetone, cyclohexanone, and methyl ethyl ketone; one solvent or a mixture of two or more thereof. It is a solvent made of Moreover, by using a composition consisting of a copolymer of an acrylic acid derivative monomer (or methacrylic acid derivative monomer) and an active hydrogen compound instead of the polyacrylic acid derivative (or polymethacrylic acid derivative) exemplified above. , the adhesion of the adhesive can be further strengthened. Examples of active hydrogen compounds include 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, and 2-hydroxypropyl methacrylate, as well as acrylic acid, methacrylic acid, maleic acid,
Examples include organic acids such as maleic anhydride, fumaric acid, citraconic acid, citraconic anhydride, itaconic acid, and itaconic anhydride. In this case as well, for the reasons mentioned above, the copolymer
It is necessary to mix 1 to 50 parts by weight of acrylonitrile to 100 parts by weight. To manufacture the molding, the extruded molding base material 1a is cut into a predetermined length, and then the adhesive is applied to the back surface (or the surface of the tape 3a) to bond the molding base material 1a and the tape 3a. pasting,
Next, the solvent may be evaporated by natural drying (or forced drying). Next, in order to measure the adhesion between the molding base material 1a and the tape 3a, a test was conducted using the following method. Test method: Adhesive 2 was applied to the back of the molding base material 1a made of EPDM and air-dried for 30 minutes at room temperature, then a tape 3a made of 5x chloroprene rubber foam was attached and dried at 100°C for 2 minutes. Ta. Next, after this molding was left at room temperature (25°C) for 20 days, the shear strength was measured at a tensile rate of 30 mm/min, and the results shown in Table 2 were obtained. The composition of the adhesive 2 used is as follows,
All organic solvents were mixed solvents of toluene/cyclohexane/ethyl acetate=1/1/1 [weight ratio]. (Hereinafter, all parts indicate parts by weight) Test 1 Adhesive: A mixture of 100 parts of poly-n-butyl acrylate and 1 part of acrylonitrile (solid content concentration = 37%) Test 2 Adhesive: Poly-n-butyl methacrylate 100
Test 3 Adhesive: Copolymer of n-butyl acrylate and 2-hydroxyethyl methacrylate (n-butyl acrylate/2-hydroxyethyl methacrylate = 97/3) ) and 20 parts of acrylonitrile (solid content concentration = 37%) Test 4 (Comparative Example 1) Adhesive: Only n-butyl acrylate was used.
(Solid content concentration = 37%) Test 5 (Comparative example 2) Adhesive: A mixture of 100 parts of n-butyl acrylate and 70 parts of acrylonitrile (solid content concentration = 37%)
%) Test 6 (Comparative Example 3) Chloroprene rubber adhesive (manufactured by Konishi Co., Ltd., “G
-17”) only used.

【table】

[Second example]

As shown in FIG. 2, the molding of this embodiment includes a molding base material 1b made of vinyl chloride resin, a tape 3b made of a five-fold polyethylene foam, and a coating formed between the molding material base material 1b and the tape 3b. The pressure sensitive adhesive 2 is made of adhesive 2. The molding base material 1b is made by extrusion molding a vinyl chloride resin having the composition shown in Table 3 below at 170°C.

[Table] Next, in order to measure the adhesion between the molding base material 1b and the tape 3b, a test was conducted using the following method. Test method: Tape 3b made of 5x polyethylene foam
Adhesive 2 was applied to the surface of and air-dried for 30 minutes at room temperature, and then a molding base material 1b made of vinyl chloride resin was attached and dried at 100° C. for 2 minutes. Next, after this molding was left at room temperature (25°C) for 20 days, the shear strength was measured at a tensile rate of 30 mm/min, and the results shown in Table 4 were obtained. The composition of the adhesive 2 used is as follows,
All organic solvents were mixed solvents of toluene/cyclohexane/ethyl acetate=1/1/1 [weight ratio]. Test 7 Adhesive: Mixture of 100 parts of n-butyl acrylate and acrylic acid copolymer (n-butyl acrylate/acrylic acid = 95/5) and 50 parts of acrylonitrile (solid content concentration = 37%) Test 8 Adhesive : A mixture of 80 parts of poly-n-butyl methacrylate, 20 parts of 2-ethylhexyl acrylate, and 15 parts of acrylonitrile (solid concentration = 37
%) Test 9 Adhesive: Mixture of 20 parts of poly-n-butyl methacrylate, 80 parts of lauryl acrylate, and 15 parts of acrylonitrile (solid content = 37%) Test 10 (Comparative Example 4) Acrylic adhesive (Mitsubishi Only ``Dianaru-882'' (manufactured by Rayon Co., Ltd.) is used.

[Table] From the above test results, it was found that by using the adhesive 2 of this example, the adhesion between the molding base material 1b and the tape 3b was significantly improved. This molding can be attached to an automobile body or bumper by applying a commercially available acrylic adhesive or chloroprene rubber adhesive to the other side of the tape. In particular, when the tape is made of a polyolefin polymer, it may be coated with the adhesive of the present invention. It should be noted that the present invention is not limited to the above embodiments, and for example, prior to applying the adhesive 2, the surface of the molding base material (or tape) made of polyolefin polymer is subjected to corona discharge treatment, plasma treatment, etc. By doing so, the adhesion between the adhesive 2 and the molding base material (or tape) can be further strengthened. As an example, conditions for performing corona discharge treatment are shown below. Corona discharge treatment conditions: Power: 1KW Electrode: Knife-shaped electrode length: 300mm Electrode-base material spacing: 1.0mm Effects of the invention As detailed above, the molding has extremely strong adhesion between the molding base material and the tape. By attaching this to an adherend (automobile body or bumper),
It is less likely to peel off even after long-term use.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the molding of the first embodiment, and FIG. 2 is a sectional view showing the molding of the second embodiment. 1a, 1b...Mall, 3a, 3b...Tape, 2
...adhesive.

Claims (1)

[Claims] 1. Consisting of a molding base material and a tape attached to the back surface of the molding base material, and between the back surface of the molding base material and the tape, 100% by weight of a polyacrylic acid derivative and/or a polymethacrylic acid derivative is contained. 1 to 50 parts by weight of acrylonitrile. 2. The mall according to claim 1, wherein the polyacrylic acid derivative or polymethacrylic acid derivative is a copolymer with an active hydrogen-containing compound. 3. The mall according to claim 1, wherein at least one of the mall base material and the tape is a polyolefin polymer.