JPH0323102B2 - - Google Patents

Description

[Detailed description of the invention]

Purpose of the Invention (Field of Industrial Application) The present invention is a method for applying paints or adhesives to the surface of various synthetic rubbers including polyolefin vulcanized rubber, or various synthetic resins including polyolefin synthetic resins and vinyl chloride. The present invention relates to a primer composition that is applied as an undercoat to enhance the adhesion of these products. (Prior technology) There are many types of industrial rubber products, but polyolefin vulcanized rubbers such as ethylene-propylene-diene ternary copolymer rubber (EPDM) and ethylene-propylene copolymer rubber (EPM) are particularly popular. It exhibits outstanding performance in terms of weather resistance, aging resistance, ozone resistance, etc., and the operating temperature range is -50℃ to 150℃.
Rubber has excellent features such as being able to cover a wide range of areas, so it is now used in a wide variety of fields. In addition, depending on the application, natural rubber (NR), styrene-butadiene copolymer rubber (SBR), butadiene rubber (BR), isobutylene-isoprene copolymer rubber (IIR), chloroprene rubber (CR), acrylonitrile can be added to the above EPDM or EPM. -Rubbers blended with synthetic rubbers such as butadiene copolymer rubber (NBR), or rubbers blended with resins such as ABS resin, styrene resin (PS), polyethylene (PS), and polypropylene (PP) are also used in many fields. There is. In addition, polyolefin-based synthetic resins such as PP and PE mentioned above, like polyolefin-based vulcanized rubber, have excellent performance in terms of weather resistance, aging resistance, ozone resistance, etc., and are also inexpensive, so they can be used in a variety of vehicles. It is used in a wide range of applications such as parts and electrical products. (Problem to be solved by the invention) However, polyolefin-based vulcanized rubbers such as EPDM and EPM, and polyolefin-based synthetic resins such as PP and PE do not contain polar groups in the main chain of their molecules, so they are reactive. The problem is that even if paint or adhesive is applied to the surface of a molded product made from these rubbers or resins, the resulting coating film is likely to peel off. However, although many countermeasures have been attempted to address the above-mentioned drawbacks, no satisfactory solution has yet been found. In addition, with molded products made from resins containing large amounts of plasticizer, such as vinyl chloride, the plasticizer migrates to the surface after long-term use, so paints and adhesives applied to the surface do not adhere well. The disadvantage is that the power gradually decreases. As a result of repeated research in view of the above problems, the present inventor has arrived at the present invention by discovering a primer composition that has strong adhesion to polyolefin vulcanized rubber, polyolefin synthetic resin, vinyl chloride, etc. This is what I did. Structure of the Invention (Means for Solving the Problems) That is, the present invention provides a method for applying paint to the surface of a molded product made of polyolefin vulcanized rubber such as EPDM or EPM, polyolefin synthetic resin such as PP or PE, or vinyl chloride resin. (a) a mixture of at least one polymethacrylic acid derivative or polyacrylic acid derivative and chlorinated rubber; or (b) at least one methacrylic acid derivative monomer or acrylic acid derivative monomer. The above-mentioned problems have been solved by devising a primer composition comprising a mixture of Lewis acid and one of the following: a polymer comprising: and chlorinated rubber. (Function) The above primer composition has strong adhesion to polyolefin vulcanized rubber, polyolefin synthetic resin, vinyl chloride resin, etc., so by using it as an undercoat, polyolefin vulcanized rubber, polyolefin synthetic resin, vinyl chloride resin, etc. The adhesion of paints and adhesives applied to the surface of molded products made of rubber, polyolefin synthetic resin, vinyl chloride resin, etc. is greatly improved. (Example) Hereinafter, the constituent components of the primer composition of the present invention will be explained by giving specific examples. First, the chlorinated rubber of the present invention is a rubber obtained by chlorinating natural rubber or various synthetic rubbers, and specifically, it is a rubber that is contained in the main chain of molecules constituting the natural rubber or various synthetic rubbers. A rubber composition with a molecular weight of about 5,000 to 100,000 and a chlorine content of 65% or more obtained by chlorinating double bonds. Next, the Lewis acids used in the present invention specifically include AlCl ₃ , AlBr ₃ , AlF ₃ , GaF ₃ , InF ₃ , TlF ₃ ,
GaCl ₃ , PCl ₃ , PCl ₅ , SbCl ₃ , SbCl ₅ , FeCl ₃ or

【formula】

[Formula] can be exemplified. Next, polymethacrylic acid derivatives include methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, iso-butyl methacrylate,
Examples include polymers of methacrylic acid derivatives such as 2-ethylhexyl methacrylate, isodecyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, glycidyl methacrylate, and dimethylaminoethyl methacrylate. Polyacrylic acid derivatives include methyl acrylate, ethyl acrylate, n-butyl acrylate, iso-butyl acrylate, 2-ethylhexyl acrylate, isodecyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, glycidyl acrylate, dimethyl Examples include polymers of acrylic acid derivatives such as aminoethyl acrylate. The above-mentioned polymethacrylic acid derivatives and polyacrylic acid derivatives may be mixed alone with chlorinated rubber and Lewis acid, or a mixture of several types may be mixed as appropriate. Furthermore, polymethacrylic acid or polyacrylic acid may also be used. Furthermore, a polymer consisting of a methacrylic acid derivative monomer and/or an acrylic acid derivative monomer and a chlorinated rubber is a polymer formed by combining the above-mentioned methacrylic acid derivative monomer and/or acrylic acid derivative monomer with a chlorinated rubber such as benzoyl peroxide. This is a polymer obtained by reacting with a polymerization initiator in a solvent according to a conventional method. Next, the mixing ratio of polymethacrylic acid derivative and/or polyacrylic acid derivative and chlorinated rubber is as follows:
10 to 10 parts by weight of polymethacrylic acid derivative and/or polyacrylic acid derivative per 100 parts by weight of chlorinated rubber
Must be in the range of 500 parts by weight;
If it exceeds 10 parts by weight, the hardness of the primer composition will increase, which may cause the coating film to become brittle, while if it is less than 10 parts by weight, the adhesion will decrease. In addition, for the above-mentioned reasons, the blending ratio when polymerizing methacrylic acid monomer and/or acrylic acid monomer and chlorinated rubber is also determined based on 100 parts by weight of chlorinated rubber.
Alternatively, it is necessary that the acrylic acid derivative monomer be in the range of 10 to 500 parts by weight. Furthermore, when mixing the Lewis acid with the mixture or polymer prepared in this way, the mixing ratio is in the range of 0.1 to 200 parts by weight of the Lewis acid per 100 parts by weight of the former (mixture or polymer). If the Lewis acid is less than 0.1 part, the adhesion will decrease, and if it exceeds 200 parts by weight, no improvement in the adhesion will be observed. Next, the above primer composition can be applied to various synthetic resins such as PP, PE, and vinyl chloride, as well as polyolefin vulcanized rubber such as EPDM and EPM. The above NR in an amount within a range that will not be lost,
It also includes rubber components such as SBR, IIR, CR, and NBR, and resin components such as ABS resin, PS, PE, PP, and ethylene-vinyl acetate copolymer resin. In addition, the above-mentioned polyolefin-based vulcanized rubber and those to which the above-mentioned various rubber components and resin components are added usually contain compounds such as sulfur, morpholine disulfide, and dicumyl peroxide as vulcanizing agents. oxide, 2-mercaptobenzothiazole as a vulcanization accelerator, zinc dimethyldithiocarbamate, tetramethylthiuram disulfide, phenyl-α-naphthylamine as an anti-aging agent, antioxidant, and ozone deterioration inhibitor, 2,6
-di-t-butyl-p-cresol, carbon black, magnesium carbonate, clay as fillers, dioctyl sebacate, mineral oil, etc. as plasticizers are added. No special equipment is required to apply the primer composition, and the primer composition can be applied simply by a conventional coating method such as dipping, spraying, or brushing. In addition, the above primer composition has a very long pot life because it is a one-component type, and if the viscosity increases due to evaporation of the solvent, the viscosity can be adjusted by adding the solvent again.The solvent used is n-hexane. , saturated hydrocarbons such as cyclohexane; aromatic hydrocarbons such as benzene, toluene, and 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. It is a selected solvent or a mixed solvent consisting of two or more kinds. Hereinafter, the structure and adhesion effect of the primer composition of the present invention will be explained in detail using Examples. The chlorinated rubber used in the following examples is chlorinated rubber manufactured by Asahi Denka Co., Ltd. (trade name: "ADEKA Chlorinated Rubber"). The characteristic of chlorinated rubber is that it has a molecular weight expressed by the general formula (C ₅ H ₇ Cl ₃ ) x (C ₅ H ₆ Cl ₄ ) y (C ₁₀ H ₁₁ Cl ₄ ) z obtained by chlorinating natural rubber. Approximately 5,000 to 100,000 chlorinated rubber with a chlorine content of 65% or more. (Hereinafter, all parts are by weight.) Example 1 99.9 parts of chlorinated rubber, 10.0 parts of methyl methacrylate, and 0.05 parts of benzoyl peroxide (BPO) as a polymerization initiator were mixed in toluene/n-hexane = 1/
The polymer was dissolved in a mixed solvent consisting of 1 and reacted at 80°C for 8 hours to obtain a polymer. Next, 1.0 part of AlCl ₃ was mixed with the obtained viscous liquid, and the above mixed solvent 4859 was added.
A primer composition was prepared by diluting 100% of the primer composition. Example 2 100 parts of chlorinated rubber and 100 parts of ethyl methacrylate
0.05 part of BPO was dissolved in a mixed solvent consisting of toluene/n-hexane = 1/1, and a reaction was carried out at 80°C for 8 hours to obtain a polymer. The resulting viscous liquid is then
A primer composition was prepared by mixing 50 parts of AlBr ₃ and further diluting with 4859 parts of the above mixed solvent. Example 3 100 parts of chlorinated rubber, 200 parts of ethyl methacrylate,
100 parts of FeCl ₃ and 0.05 part of BPO were mixed with toluene/n
-Dissolve a mixed solvent consisting of bexane = 1/1, and
C. for 8 hours to obtain a polymer. Then,
The obtained viscous liquid was diluted with 4859 parts of the above mixed solvent to prepare a primer composition. Example 4 100 parts of chlorinated rubber, 100 parts of methyl acrylate and 0.05 parts of BPO were dissolved in a mixed solvent consisting of toluene/n-hexane = 1/1, and a reaction was carried out at 80°C for 8 hours to obtain a polymer. The resulting viscous liquid is then
Mix 100 parts of SbCl ₃ and then add the above mixed solvent 4859
A primer composition was prepared by diluting 100% of the primer composition. Example 5 100 parts of chlorinated rubber, 500 parts of propyl methacrylate and 0.05 parts of BPO were mixed in toluene/n-hexane = 1/
The polymer was dissolved in a mixed solvent consisting of 1 and reacted at 80°C for 8 hours to obtain a polymer. Then the resulting viscous liquid

[Formula] 50 parts were mixed and further diluted with 4859 parts of the above mixed solvent to prepare a primer composition. Example 6 100 parts of chlorinated rubber, 10 parts of polypropyl acrylate
1 part was dissolved in a mixed solvent consisting of toluene/n-hexane = 1/1. The resulting viscous liquid is then
Mix 1.0 part of AlCl ₃ and add the above mixed solvent 4859
A primer composition was prepared by diluting 100% of the primer composition. Example 7 100 parts of chlorinated rubber, 100 parts of polymethyl methacrylate
100 parts of polyethyl methacrylate were dissolved in a mixed solvent consisting of toluene/n-hexane=1/1. Next, 1.0 part of FeCl ₃ was added to the obtained viscous liquid, and the mixture was further diluted with 4859 parts of the above mixed solvent to prepare a primer composition. Next, in order to examine the adhesion of the primer compositions of Examples 1 to 7, an adhesion test was conducted using the following method. Test 1 A rubber compound having the composition shown in Table 1 was heated at 160°C for 30
A 2 mm thick base material made of EPDM was produced by vulcanization for 1 minute, and this was cut into a 100 mm x 100 mm square to prepare a test piece.

[Table] Next, Examples 1 to 7 were applied to each of the above test pieces.
After applying the primer composition by the dipping method and air drying at room temperature for 30 minutes, apply a urethane paint obtained by reacting a urethane composition having the composition shown in Table 2 at 80°C for 3 hours in dry nitrogen gas. 24 at room temperature
Allowed to cure for hours.

[Table] After that, the adhesion of the urethane coating of each test piece was examined by a cross-cut test, and as a result, all test pieces showed sufficient adhesion (100/100). Test 2 Vinyl chloride resin having the composition shown in Table 3 was heated at 170°C.
A 2mm thick base material is manufactured by extrusion molding, and this is
Test pieces were prepared by cutting into 100 mm x 100 mm squares.

[Table] Next, Examples 1 to 7 were applied to each of the above test pieces.
After applying the primer composition by the dipping method and air drying at room temperature for 30 minutes, apply a urethane paint obtained by reacting a urethane composition having the composition shown in Table 2 at 80°C for 3 hours in dry nitrogen gas. 24 at room temperature
Allowed to cure for hours. Thereafter, the adhesion of the urethane coating of each test piece was examined by a cross-cut test, and as a result, all test pieces showed sufficient adhesion (100/100). Test 3 The primer compositions of Examples 1 to 7 were applied to each of the test pieces made of the EPDM base material prepared in Test 1 above by a dipping method, and after air-drying at room temperature for 30 minutes, a chloroprene-based primer composition having the composition shown in Table 4 was applied. The adhesive was applied and allowed to air dry at room temperature for 24 hours.

[Table] After that, the adhesion of the coating made of chloroprene adhesive applied to the surface of each test piece was examined by a goblin test. As a result, all test pieces showed sufficient adhesion (100/100). Ta. Test 4 Next, the EPDM created in Test-1 above
Two test pieces made of the base material were prepared, and the primer composition of Example 1 was applied to each of the test pieces by a dipping method, and after air-drying at room temperature for 30 minutes, a chloroprene-based material having the composition shown in Table 4 was applied. Adhesive was applied. Thereafter, both test pieces were pasted together so that the adhesive-coated surfaces overlapped with each other, and after air-drying at room temperature for 24 hours, a tensile shear test was conducted at a speed of 30 mm/sec. Further, the primer compositions of Examples 2 to 7 were also subjected to tensile shear tests in the same manner, and the results shown in Table 5 were obtained.

[Table] The compositions of Comparative Examples 1 to 9 below have been conventionally used as undercoating agents for polyolefin-based vulcanized rubbers and polyolefin-based synthetic resins. Comparative Example 1 A primer composition was prepared by diluting "Ester Resin-20" (manufactured by Toyobo Co., Ltd., saturated polyester resin) with a mixed solvent consisting of methyl ethyl ketone/toluene = 1/9. Comparative Example 2 A primer composition was prepared by diluting "Vinyrite-VMCH" (manufactured by Union Carbide, vinyl chloride-vinyl acetate copolymer resin) with a mixed solvent consisting of methyl ethyl ketone/toluene = 1/1. Comparative Example 3 A primer composition was prepared by diluting "Eslec BM-2" (manufactured by Sekisui Chemical Co., Ltd., butyral resin) with a mixed solvent consisting of butanol/xylene = 1/1. Comparative Example 4 A primer composition was prepared by diluting "Orestar M55-80A" (manufactured by Mitsui Toatsu, moisture-curing polyurethane resin) with toluene. Comparative Example 5 A mixture of "Desmofene-100" (manufactured by Bayer, polyhydroxy compound)/"Desmodyur-R" (manufactured by Bayer, polyisocyanate) = 1/1.5 was mixed with methylene glycol/butyl acetate/toluene = 1/1/1. A primer composition was prepared by diluting with a mixed solvent consisting of: Comparative Example 6 A primer composition was prepared by diluting "Betucosol J-534" (manufactured by Dainippon Ink & Chemicals, a linseed oil-modified long oil alkyd resin) and cobalt naphthenate (desiccant) with a mineral base. Comparative Example 7 “Betsukosol J-524” (manufactured by Dainippon Ink & Chemicals, linseed oil modified long oil alkyd resin) / “Super Betsukamine J-100” (manufactured by Dainippon Ink & Chemicals, butylated melamine resin) = A primer composition was prepared by diluting a 4/1 mixture with xylene. Comparative Example 8 A primer composition was prepared by diluting a mixture of "Acryloid C-110V" (manufactured by Rohm & Haas, thermoplastic acrylic resin)/nitrocellulose = 99/1 with toluene. Comparative example 9 "Acrydik 47-712" (manufactured by Dainippon Ink & Chemicals, thermosetting acrylic resin) / "Supervetsucomin 47-508" (manufactured by Dainippon Ink & Chemicals, butyl melamine resin) = 4/1 A primer composition was prepared by diluting the mixture consisting of the following with a mixed solvent consisting of toluene/butyl acetate = 1/1. Next, the EPDM created in Test 1 above
The above Comparative Example 1 was applied to each of the test pieces made of the base material.
The primer compositions of Nos. to 9 were applied by a dipping method and air-dried for 30 minutes at room temperature, and then a urethane paint having the composition shown in Table 2 was applied and cured at room temperature for 24 hours. Thereafter, the adhesion of the urethane coating applied to the surface of each test piece was examined by a goblin test, and the coating on each test piece was found to have almost no adhesion (0/100). In addition, a tensile shear test was conducted in the same manner as in Test-4, but almost no shear strength was obtained in any of Comparative Examples 1 to 9. From the above test results, it was found that the primer compositions of Examples 1 to 7 had sufficient adhesion strength when used as an undercoat for polyolefin vulcanized rubber or vinyl chloride resin. Next, a usage example will be described in which the primer compositions of Examples 1 to 7 were applied as an undercoat when coating various molded articles for automobiles with paints and adhesives. Usage Example 1 Glass Run The polyolefin vulcanized rubber for glass runs used in sliding parts with the window glass of door frames has the composition shown in Table 1, as an example. After extrusion molding an EPDM compound consisting of this composition,
A glass run base material for automobiles was produced by vulcanization at 160°C for 30 minutes. Next, the above-mentioned example -
The primer composition No. 1 was applied by dipping and air-dried for 30 minutes at room temperature, and then a urethane paint having the composition shown in Table 6 was applied and further cured at room temperature for 24 hours.

【table】

[Table] The urethane prepolymers in Table 6 are made by reacting the compositions of Tables 7 and 8 at 80°C for 30 minutes in dry nitrogen gas, and then reacting each of the urethanes obtained. It was prepared by mixing at a ratio of 100/40 (weight ratio).

【table】

[Table] Usage example 2 Door weather strip A weather strip that seals the gap between the car body and the door is an example of a weather strip with the composition shown in Table 9.
It was manufactured by extruding an EPDM compound and then vulcanizing it at 200°C for 5 minutes.

【table】

[Table] Next, the primer composition of Example 1 was applied by dipping to the surface of this weatherstrip base material and air-dried for 30 minutes at room temperature. , reacted for 3 hours, further added 24.8 parts of 1,6-hexanediol and 170 parts of dimethylformamide, and heated at 80°C in dry nitrogen gas.
The urethane paint obtained by reacting for 20 minutes was applied thereon and left for 24 hours to cure the primer composition and the urethane paint. Thereafter, a 5% solution of dimethyl silicone oil (100,000 cSt) in toluene was applied onto the urethane coating.

[Table] Usage Example 3 Electrostatic flocking product Some of the glass run products in Usage Example 1 have electrostatic flocking done using short fibers on the glass sliding area. The primer composition of Example 2 was applied by dipping onto the surface of this glass run base material and air-dried for 30 minutes at room temperature. Next, a urethane adhesive obtained by reacting the formulation shown in Table 11 in dry nitrogen gas at 80°C for 3 hours was applied thereon, and a pile of nylon 66 short fibers was electrostatically flocked thereon. The adhesive was cured with hot air at 100°C for 3 minutes to obtain an electrostatic flocking product.

[Table] Next, the abrasion resistance of the coating films of the substrates treated in Use Examples 1 and 3 was tested using the following method. Test machine: KI type abrasion tester Test conditions: Friction element Glass (thickness 5 mm) Load: 3 kg Friction element cycle: 60 times/min Friction element stroke: 145 mm The base material was attached to the above testing machine, and the base material was tested under the conditions described above. rubbed the surface. As a result, a good result was obtained in which no exposure of the base material was observed even after repeated friction 50,000 times. Further, the abrasion resistance of the coating film of the substrate treated in Use Example 2 was tested by the following method. Testing machine: Reciprocating abrasion tester Test conditions: Friction element Glass (thickness 5 mm) Friction element cycle 60 times/min Friction element stroke 145 mm The base material was attached to the above testing machine, and the base material surface was measured under the conditions described above. was rubbed. As a result, a good result was obtained in which no exposure of the base material was observed even after repeated friction 20,000 times. In addition, we conducted a 180 degree bending test to check the followability of each of the base materials in Usage Examples 1 to 3, and all showed extremely good followability. was not damaged in any way. Usage Example 4 Resin Molding A molding attached to the side of an automobile body is attached to the body via a double-sided adhesive tape made of polyethylene foam or the like as a base material. Therefore, a molding was manufactured by extrusion molding a vinyl chloride resin having the formulation shown in Table 3 above at 170°C, and the following tests were conducted using this molding. That is, (a) As shown in FIG. 1, the primer composition 4 of Example 1 and G-G as an adhesive 5a were applied to one side of a tape 3 made of 5 times polyethylene foam.
17 (manufactured by Konishi, chloroprene rubber adhesive)
In addition, a commercially available acrylic adhesive 6 for double-sided tape is applied to the untreated side to prepare a double-sided adhesive tape 7a, and the vinyl chloride resin molding 2 is attached to the acrylic-coated iron plate 1 via the double-sided adhesive tape 7a. Pasted. (b) As primer composition 4 in the above (a), that of Example 2 was used (others are the same as in (a)). (c) As the primer composition 4 in the above (a), that of Example 3 was used (others are the same as in (a)). (d) Next, as shown in Figure 2, one side of the tape 3 made of 5x polyethylene foam
Primer composition 4 of No. 4 and Dianal 882 (manufactured by Mitsubishi Rayon, acrylic adhesive) were applied as the adhesive 5b, and a commercially available acrylic adhesive for double-sided tape 6 was applied to the untreated surface to form a double-sided adhesive tape 7b. was adjusted, and the vinyl chloride resin molding 2 was attached to the acrylic-coated iron plate 1 via this double-sided adhesive tape 7b. (e) As primer composition 4 in (d) above, that of Example 5 was used (others were the same as in (d)). (f) Example 6 was used as primer composition 4 in (d) above (others were the same as in (d)). (g) As Comparative Example 1, as shown in Figure 3, only the above G-17 was applied as the adhesive 5a on one side of the tape 3 made of 5x polyethylene foam (others were the same as in (a)). ). (h) As Comparative Example 2, as shown in FIG. 4, only Dial 882 was applied as the adhesive 5b to one side of the tape 3 made of 5x polyethylene foam. (Others are the same as (d)). Next, each of the moldings 2 of (a) to (h) above was subjected to a tensile shear test at a pulling speed of 30 mm/min, and the results shown in Table 12 were obtained.

[Table] From the above test results, the adhesion of the paint and adhesive applied to the surface of the primer compositions of Examples 1 to 7 is extremely strong, and is sufficient as an undercoat for various molded automobiles. It was found that it has a great effect. Effects of the Invention As detailed above, the primer composition of the present invention can be used as an undercoat when applying various paints and adhesives to the surface of molded products made of polyolefin vulcanized rubber or polyolefin synthetic resin. By applying various paints and adhesives on top, extremely strong adhesion can be obtained. Furthermore, in the case of polyolefin-based vulcanized rubber, the flexibility and flexibility, which are the characteristics of the same rubber, are not impaired. Therefore, this primer composition is an excellent invention that can be applied to a wide range of applications, including the various molded articles for automobiles mentioned above, as well as polyolefin vulcanized rubber and polyolefin synthetic resins that require strong adhesion. .

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing a mounting structure for a molding using the primer composition of the present invention as an undercoat, and FIGS. 3 and 4 are cross-sectional views showing an example of a conventional molding mounting structure, respectively. It is a diagram. 2...Moll, 4...Primer composition.

Claims (1)

[Scope of Claims] 1 (a) a mixture of at least one polymethacrylic acid derivative or polyacrylic acid derivative and chlorinated rubber, or (b) a mixture of at least one methacrylic acid derivative monomer or acrylic acid derivative monomer and chlorinated rubber A primer composition comprising a mixture of any one of the following polymers and a Lewis acid. 2 In the mixture of (a) at least one polymethacrylic acid derivative or polyacrylic acid derivative and chlorinated rubber, the blending ratio of the former is 10 to 500.
The primer composition according to claim 1, wherein the chlorinated rubber is 100 parts by weight. 3 In the polymer consisting of at least one of the methacrylic acid derivative monomer or acrylic acid derivative monomer and chlorinated rubber (b), the blending ratio of the two is as follows:
2. The primer composition according to claim 1, wherein the former is 10 to 500 parts by weight and the chlorinated rubber is 100 parts by weight. 4. (a) A mixture of at least one polymethacrylic acid derivative or polyacrylic acid derivative and chlorinated rubber, or (b) a polymer consisting of at least one methacrylic acid derivative monomer or acrylic acid derivative monomer and chlorinated rubber. In a mixture of either type and Lewis acid, the mixing ratio of both is 100 parts by weight of the former and 0.1 to 0.1 parts by weight of the Lewis acid.
200 parts by weight of the primer composition according to claim 1.