JP5917066B2 - Resin composition - Google Patents

Description

  The present invention belongs to the field of metal coating technology, and particularly provides an undercoat paint / adhesive (primer) that exhibits excellent anticorrosion performance without using heavy metals, and a metal laminate used using the same. It is.

  Conventionally, metals are generally used by performing various surface treatments for the purpose of imparting anticorrosion properties, design properties, etc., and further laminating a coating or a PET film. In the case of paints, it is usually difficult to satisfy various required performances such as corrosion resistance, adhesion, workability, water resistance, designability, antifouling properties, weather resistance, coating film hardness, etc. The undercoat (primer), intermediate coat, and top coat (top) are used by laminating paints that share their functions. In addition, the number of cases in which a film is laminated after undercoating has been increasing in recent years.

  In the case of these coated steel sheets and film laminated steel sheets, for example, when scratches penetrating the coating film or film occur, such as coating defects or scratches generated during punching or bending, the insulating properties of the portions are lost, and corrosion resistance cannot be ensured. In order to improve the scratch corrosion resistance, compounds containing heavy metals, such as chromium, lead, and zinc, which cause environmental pollution, are usually used in large quantities as anticorrosive pigments.

  On the other hand, the inventors have begun studying paying attention to a conductive polymer that has been studied for application to metal corrosion prevention in recent years. The conductive polymer is a polymer in which a π-electron conjugated system has been developed, and polyacetylene, polyaniline, polypyrrole, polythiophene, and the like are known. Of these, polyaniline has been extensively studied for its metal anticorrosive ability.

  Patent Document 1 describes that adhesion and corrosion resistance that can replace the conventional chromate treatment can be obtained by forming a film made of resin, polyaniline, and inorganic oxide on a metal plate. However, water-soluble or water-dispersible acrylic resin, epoxy resin, urethane resin, etc. are used as the base resin, and these films have insufficient stretch and strength properties compared to the present invention based on polyester resin. It is.

  Patent Document 2 describes that a conductive polymer having an average molecular weight of 20,000 or more is dispersed in an organic resin film and formed on a steel plate. The inadequate points of this technology are: (1) The conductive polymer is made high molecular weight, but the skeleton of the molecular chain remains rigid and does not bring about the effect of improving workability; (2) Conductivity The crystallinity of the polymer is specified without any upper limit, but the processability is hindered. (3) Since the provisions related to matrix-forming polymers and dopants are not widely specified and are not specified, the importance is found. And (4) a technology that assumes coating ground treatment, and the technical idea is different from the present invention.

  Patent Documents 3 and 4 describe a film comprising a conductive polymer / non-conductive thermoplastic polymer (and / or non-conductive thermosetting polymer) / inorganic oxide / acid component such as phosphoric acid (and / or a derivative thereof). Is formed on a metal plate. However, (1) There is no good description about the usefulness of the dopant (2) The thermosetting polymer is particularly an epoxy resin and / or an acid-modified epoxy resin and / or an amine-modified epoxy resin, and relates to the phenol resin of the present invention. We do not find importance.

JP-A-10-251509 JP 2007-190896 A JP 2000-119599 A JP 2001-64587 A

  From the above current situation, it is a problem to satisfy the required performance required as a primer by improving the corrosion resistance by containing a conductive polymer. It is environmentally friendly because it does not contain heavy metal rust preventive pigments.

  The present inventors have brought out the corrosion resistance performance of the conductive polymer, established other performance as a primer at a very high level, and completed the present invention.

  That is, this invention is providing the resin composition characterized by including a polyester resin (A), a phenol resin (B), a conductive polymer (C), and a dopant (D).

  The resin composition of the present invention belongs to the field of metal coating technology, and particularly an undercoat paint / adhesive (primer) that exhibits excellent anticorrosion performance without using heavy metals, and a metal laminate used therewith Is to provide. Although it does not restrict | limit in particular, As a concrete use, it is used as can bodies or lids, such as an electrical appliance for household appliances, a building material, a motor vehicle, a machine tool, a bridge, a drink can, a food can. Moreover, it can be used as an adhesion primer for films such as PET, PBT, PP and PE as well as a primer for coated steel sheets such as intermediate coating and top coating.

  The resin composition of the present invention relates to a resin composition comprising a polyester resin (A), a phenol resin (B), a conductive polymer (C) and a dopant (D). Hereinafter, the composition of the present invention will be described in more detail.

  The polyester resin (A) used in the resin composition of the present invention preferably has a number average molecular weight of 3,000 to 100,000 and a glass transition temperature of 0 ° C. to 100 ° C. The number average molecular weight is a number average molecular weight in terms of polystyrene of GPC.

  The polyester resin (A) may be any one obtained by esterifying a polybasic acid component and a polyhydric alcohol component. Examples of the polybasic acid component include one or more dibasic acids such as phthalic anhydride, isophthalic acid, terephthalic acid, succinic acid, fumaric acid, adipic acid, azelaic acid, sebacic acid, dimer acid, and the like. The lower alkyl esterified product of benzoic acid, crotonic acid, pt-butylbenzoic acid and other monobasic acids, trimellitic anhydride, methylcyclohexeric tricarboxylic acid, pyromellitic anhydride, etc. A tribasic or higher polybasic acid is used in combination.

  Examples of the polyhydric alcohol component include ethylene glycol, diethylene glycol, propylene glycol, 1,4-butanediol, neopentyl glycol, 3-methylpentanediol, 1,4-hexanediol, 1,6-hexanediol, and cyclohexanedi. A dihydric alcohol such as methanol is mainly used, and a trihydric or higher polyhydric alcohol such as glycerin, trimethylolethane, trimethylolpropane and pentaerythritol can be used in combination as necessary. These polyhydric alcohols can be used alone or in admixture of two or more.

  The polyester resin (A) used in the resin composition of the present invention preferably has a number average molecular weight of 3,000 to 100,000, more preferably 6,000 to 30,000, still more preferably 15,000 to 30,000. The glass transition temperature is preferably 0 ° C to 100 ° C, more preferably 10 to 90 ° C, still more preferably 30 to 80 ° C. When the number average molecular weight is lower than 3,000, the processability is deteriorated. When the number average molecular weight is higher than 100,000, the viscosity at the time of coating becomes high and appropriate coating cannot be performed. In particular, when the number average molecular weight is 15,000 to 30,000, the balance between corrosion resistance and workability is extremely good. On the other hand, when the glass transition temperature is lower than 0 ° C., the barrier properties such as water vapor and oxygen are inferior, so that the corrosion resistance of the coating film is inferior and the blocking property is also inferior. When the glass transition temperature is higher than 100 ° C., the coating film becomes hard and the workability deteriorates. Furthermore, the skeleton of the polyester resin is preferably linear rather than branched.

  Examples of commercially available products include Byron 300, 500, 560, 600, 630, 650, 670, Byron GK130, 140, 150, 190, 330 manufactured by Toyobo Co., Ltd. 590, 680, 780, 810, 890, 200, 226, 240, 245, 270, 280, 290, 296, 660, 885, Byron GK250, 360, 640, 880, Unitika Co., Ltd. Eritel UE-3220, 3500, 3210, 3215, 3216, 3620, 3240, 3250, 3300, UE-3200, 9200 3201, 3203, 3350, 3370, 3380, 3600, 3600, 3980, 3660, 3690, 960 , The 9800, Toagosei Co., Ltd. Aron Melt PES-310, the 318, the 334, the 316, such as the 360, and the like.

  Among the polyester resins (A) used in the resin composition of the present invention, the polyester resin (A-1) essentially comprising diphenolic acid has excellent curability with the phenolic resin, resulting in particularly water resistance, Corrosion resistance is improved. The amount of diphenolic acid introduced in the polyester resin (A-1) is preferably 0.1 to 10% by mass. If it is lower than 0.1% by mass, the effect of improving curability, water resistance and corrosion resistance cannot be obtained, and if it exceeds 10% by mass, the curing proceeds too much and the workability becomes inferior.

  Examples of the phenol resin (B) used in the resin composition of the present invention include, but are not limited to, typical ones such as carboxylic acid, m-cresol, m-ethylphenol, 3,5-xylenol, and m-methoxyphenol. Trifunctional phenolic compounds or various bifunctional compounds such as p-cresol, o-cresol, p-tert-butylphenol, p-ethylphenol, 2,3-xylenol, 2,5-xylenol, m-methoxyphenol Phenol and formaldehyde are synthesized in the presence of an alkali catalyst. These phenol compounds can be used alone or in admixture of two or more. Moreover, the thing of the form which etherified one part or all part of the methylol group contained in a phenol resin by alcohol with 1-12 carbon atoms can also be used.

  The conductive polymer (C) used in the resin composition of the present invention can promote passivation of the base metal and can impart scratch corrosion resistance to the metal plate. Since the oxidation-reduction potential of the conductive polymer is noble with respect to the potential of the base metal, an oxidation reaction of the base metal and a reduction reaction of the conductive polymer occur at the interface with the base metal to form a stable passive film at the interface. Since the passive film is an insulator and is dense, it functions as a barrier layer against corrosion factors. Therefore, the corrosion resistance of the base metal can be greatly improved. Here, it is known that the oxidation-reduction reaction of the conductive polymer is reversible, and returns to the original state by a coupling reaction with the reduction reaction of dissolved oxygen. That is, the conductive polymer can be expected to have an effect of permanently preventing the base metal without deteriorating itself due to its reversible redox property. Since the above anticorrosion process promotes spontaneous passivation of the base metal in a corrosive environment, it can be considered that the conductive polymer has a kind of self-repair action. Therefore, even if a scratch penetrating the coating occurs, it is possible to remarkably suppress the progress of corrosion by forming a passivating coating around the wound.

The conductive polymer (C) of the present invention is a semiconductor in the dedope state and has a band gap. Therefore, in order to impart conductivity, it is necessary to add a dopant and take π electrons from the conjugated system of the main chain of the conductive polymer to generate holes on the main chain. The dopant is preferably one or a mixture of two or more selected from halogens, proton acids, Lewis acids, transition metal halides, and alkali metals. Of these, halogens, protonic acids and Lewis acids are particularly preferable because they have stable anticorrosive ability.
As halogens, bromine, chlorine, iodine and the like can be used, and as the protonic acid, organic carboxylic acid, organic sulfonic acid, organic phosphonic acid, phosphoric acid, polyphosphoric acid and the like can be suitably used. As the Lewis acid, metal halides such as FeCl3, FeOCl, TiCl4, ZrCl4, SnCl4, MoCl5, WCl5, BF4, BCl3, and PF5 can be used.
Among them, a protonic acid is preferable, and polymer acids such as polystyrene sulfonic acid, polyvinyl sulfonic acid, and polyphosphoric acid are particularly preferable. Since these have a film-forming ability, they increase the continuity of the resin serving as the adhesion layer and are effective for adhesion and corrosion resistance.
The addition amount of the dopant is in the range of 0.01 to 1.0 mol with respect to 1 mol of the conductive polymer added to the resin. If the added amount of the dopant is less than 0.01 mol with respect to 1 mol of the conductive polymer, the number of carriers generated on the polymer main chain is insufficient and sufficient electrical conductivity cannot be obtained. Since the anticorrosion effect of the conductive polymer depends on the smooth exchange of electrons with the metal to be anticorrosive, the decrease in conductivity reduces the passivation ability and the scratch corrosion resistance is poor. On the other hand, if the additive amount of the dopant exceeds 1 mol with respect to 1 mol of the conductive polymer, the treatment liquid becomes unstable and the workability of the primer film is deteriorated, and there is a concern that the corrosion resistance of the scratches is lowered. Therefore, the addition amount of a dopant is prescribed | regulated in the range of 0.01-1.00 mol with respect to 1 mol of conductive polymers.

  The metal alkoxide compound and / or metal chelate compound (E) that can be used in the resin composition of the present invention causes a curing reaction with the polyester resin (A), the phenol resin (B), and the epoxy resin (F). A crosslinking reaction proceeds between the functional group of each resin and the metal alkoxide compound and / or metal chelate compound (E). By incorporating a metal into the crosslinked structure in the coating film, the strength of the coating film is improved, and as a result, the function of dramatically improving impact resistance and corrosion resistance is imparted. In addition, the metal alkoxide compound and / or metal chelate compound (E) is low-temperature curable as compared with conventionally known organic compounds alone, for example, polyester / phenol, polyester / phenol / epoxy, and polyester / melamine resin compositions. It is characterized by being particularly excellent in curability at a high temperature in a short time. By utilizing this feature, it is possible to lower the baking temperature and shorten the time, which has been difficult with only known organic compounds, leading to energy cost reduction and carbon dioxide emission suppression. Examples of the metal alkoxide compound and / or metal chelate compound (E) include alkoxide metal compounds such as zirconium, aluminum, titanium, and tin, and metal chelate compounds in which acetoacetic acid is coordinated to a metal.

  The epoxy resin (F) used in the resin composition of the present invention mainly improves the adhesion of the coating film. As a commercially available epoxy resin, BPA type is Epicoat 1001, Epicoat 1004, and novolak type is DIC Corporation Epicron N-665, 670, 673, 680, 690, 690 695, 730, 740, 770, 865, 870, ECN-1273 and ECN-1299 manufactured by Asahi Kasei Epoxy Corporation.

  The resin composition of the present invention can further contain a curing catalyst (G). Examples of the curing catalyst (G) include, in particular, typical ones, inorganic acids such as phosphoric acid, organic acids such as dodecylbenzenesulfonic acid and toluenesulfonic acid, and those blocked with an amine or the like. Can be used. The mixing ratio of the curing catalyst (G) is preferably 0.01 to 5% in the total solid content.

  Examples of the organic pigment and / or inorganic pigment (H) that can be used in the resin composition of the present invention include chromate (yellow lead, chromium vermillion) ferrocyanide (bitumen), sulfide (cadmium yellow, cadmium). Red), oxide (titanium oxide, bengara, iron black), sulfate (barium sulfate, lead sulfate), silicate (ultraviolet, calcium silicate), carbonate (calcium carbonate, magnesium carbonate) phosphate (cobalt violet) metal Inorganic pigments such as powder (aluminum powder, bronze) carbon (carbon black), azo type (benzidine yellow, Hansa yellow, Vulcan orange, permanent red F5R, carmine 6B, lake red C, chromoftal red, chromoftal yellow), Phthalocyanine (phthalocyanine blue, phthalocyanine Green), vat dyes (induslen blue, thioindigo bordeaux) dyed lakes (eosin lake, quinoline yellow, rhodamine lake, methyl violet lake), quinacrine (sinkasia red, shinkasia violet) Organic pigments such as PV Fast Violet BL) can be mentioned, and these may be used alone or in combination. These pigments make it possible to color the coating film and impart design properties, and arbitrary organic pigments and inorganic pigments can be added to the required design. The blending ratio of the organic pigment and / or inorganic pigment (H) is preferably 0.1 to 70 parts by mass with respect to the total solid content.

  The rust inhibitor (I) that can be used in the resin composition of the present invention is not particularly limited, but examples of the inorganic rust inhibitor include zinc oxide, zinc phosphate, aluminum phosphate, Examples of organic rust preventives include tannic acid.

  The blending ratio (mass) of the polyester resin (A) and the phenol resin (B) in the resin composition of the present invention is preferably 60:40 to 95: 5, more preferably 70:30 to 85:15. is there. When the ratio of the polyester resin (A) is lower than 60, the elongation of the coating film is insufficient, so that the workability is deteriorated. When the ratio is higher than 95, the curability is insufficient and the water resistance is deteriorated. The blending ratio of the conductive polymer (C) is preferably 0.01 to 20% by mass, more preferably 1 to 15% by mass in the total solid content. If the blending ratio of the conductive polymer (C) is lower than 0.01% by mass, the formation of the passivating film at the interface with the base metal becomes insufficient. On the other hand, when the content is higher than 15% by mass, the adhesion to the base metal and the workability become poor. The compounding ratio of the metal alkoxide compound and / or metal chelate compound (E) preferably contains 0.01 to 10% by mass in the total solid content. When the content of the metal alkoxide compound and / or the metal chelate compound (E) is lower than 0.01% by mass, the impact resistance and corrosion resistance effects expected cannot be obtained. In addition to being hard and inferior in workability, problems such as thickening or gelation of the paint occur. The compounding ratio of the epoxy resin (F) is preferably 0.1 to 30% by mass in the total solid content. When the ratio of the epoxy resin (F) is lower than 0.1% by mass, the adhesion of the coating film becomes inferior, and when it exceeds 30% by mass, the water resistance becomes inferior.

  The solvent that can be used in the paint using the resin composition of the present invention is not particularly limited, but for example, aromatic hydrocarbons such as toluene, xylene, Solvesso # 100, Solvesso # 150, hexane, heptane, octane, Examples include aliphatic hydrocarbons such as decane, and various ester organic solvents such as methyl acetate, ethyl acetate, isopropyl acetate, butyl acetate, amyl acetate, ethyl formate, and butyl propionate. Water-miscible organic solvents such as alcohols such as methanol, ethanol, propanol, and butanol, ketones such as acetone, methyl ethyl ketone, and cyclohaxanone, ethylene glycol (mono, di) methyl ether, ethylene glycol (mono, di) ethyl ether, ethylene Glycol monopropyl ether, ethylene glycol monoisopropyl ether, monobutyl ether, diethylene glycol (mono, di) methyl ether, diethylene glycol (mono, di) ethyl ether, diethylene glycol monoisopropyl ether, diethylene glycol monobutyl ether, triethylene glycol (mono, di) methyl Ether, propylene glycol (mono, di) methyl ether, propylene glycol monopropyl ether , Propylene glycol monobutyl ether, dipropylene glycol (mono, di) include various organic solvents glycol ether such as methyl ether.

  Conventionally known lubricants, antifoaming agents, leveling agents, lubricants, pigments and the like can be added to the resin composition of the present invention. In addition, other curing agents such as urea resin, melamine resin, benzoguanamine resin, isocyanate resin, and polyamide resin may be used in combination as curing aids, and these are dried in the case of paint baking conditions or film coating. Appropriate materials can be used in combination depending on the conditions and lamination conditions.

  The resin composition of the present invention can be used for various types of spray coating, dip coating, roll coater coating, gravure coater and electrodeposition coating, such as air spray, airless spray or electrostatic spray, by a known means such as a steel plate or an aluminum plate. It can be applied as a paint or adhesive such as a metal substrate or PET pet film. The coating amount is preferably about 0.1 to 20 μm in terms of dry coating thickness.

  Moreover, it is preferable that the resin composition of this invention is baked within the range which consists of 100-280 degreeC and 1 second-30 minutes. When it is applied to a film substrate such as PET or PP, it is dried at 80 to 180 ° C. for 1 to 30 seconds and then laminated to a metal plate at a temperature within the range of 150 to 300 ° C. As a result, excellent performance as a primer can be exhibited.

  Hereinafter, the present invention will be specifically described with reference to Examples. In the examples, “part” and “%” represent “part by mass” and “% by mass”, respectively.

Example of Synthesis 1 (Synthesis of polyester resin (A-1-1) containing diphenolic acid as an essential component)
As an acid component, 50 parts by mass of terephthalic acid, 112 parts by mass of isophthalic acid, 4.9 parts by mass of diphenolic acid, and 50 parts by mass of 2-ethyl-2-butyl-1,3-butanediol as a polyhydric alcohol component, , 4-butanediol 99 parts by weight, 1,4-cyclohexanedimethanol 48 parts by weight, titanium tetrabutoxide 0.07 parts by weight are charged into a 2 L flask, gradually heated to 220 ° C. over 4 hours, water is retained. Esterification was carried out. After distilling a predetermined amount of water, the polymerization was carried out under reduced pressure to 10 mmHg over 30 minutes, the temperature was raised to 250 ° C., and the latter polymerization was carried out at 1 mmHg or less for 50 minutes. Next, the polymerization under reduced pressure was stopped, the mixture was cooled to 220 ° C. under a nitrogen stream, 1.9 parts by mass of trimellitic anhydride was added, and the mixture was stirred at 220 ° C. for 30 minutes to perform carboxy group modification (post-addition), and then resin The polyester resin (A-1-1) having a number average molecular weight of 22,000, an acid value of 5 (mgKOH / g), and a glass transition temperature of 30 ° C. was obtained. Then, it cooled to 100 degrees C or less, and diluted with the mixed solution of cyclohexanone / solvesso 150 = 50/50, and obtained the polyester resin (A-1-1) solution of 40% of non volatile matters.

The following raw materials were blended and stirred at the ratios shown in Tables 1 and 2 (numbers in the table indicate solid mass ratios), and the paints of Examples 1-10 and Comparative Examples 1-6 had a nonvolatile content of 25%. It produced so that it might become.
(1) Polyester resin (A-1-1) Number average molecular weight 22,000 of polyester resin containing diphenolic acid as an essential component, acid value 5 (mgKOH / g), glass transition temperature 30 ° C., cyclohexanone / solvesso 150 = 40% dissolved product of 50/50 mixed solution.
(2) Polyester resin (A-1-2) = Byron GK-360, Toyobo Co., Ltd. number average molecular weight 16,000, acid value 5 (mgKOH / g), glass transition temperature 56 ° C., cyclohexanone / solvesso 150 = 40% dissolved product of 50/50 mixed solution.
(3) Phenol resin (B-1) = TD2495, DIC paracresol type phenol resin, 50% normal butanol solution (4) Conductive polymer (C-1) = Polyaniline 6% toluene solution, dopant (D-1) : Dodecylbenzenesulfonic acid, TA Chemical Co., Ltd. (5) Metal alkoxide compound (E-1) = ZA-65, Matsumoto Fine Chemical Co., Ltd. zirconium butoxide (6) Epoxy resin (F-1) = Epicoat 1001, Mitsubishi Chemical Co., Ltd. (7) Curing Catalyst (G-1) NACURE5925, Enomoto Kasei Co., Ltd. Dodecylbenzenesulfonic Acid (Catalyst), 25% Solution (8) Rust Inhibitor (I-1) Tannic Acid AL, Made by Fuji Chemical Industry Co., Ltd.

[Preparation of evaluation sample]
After applying the undercoat paint (primer) of each of Examples 1 to 10 and Comparative Examples 1 to 6 on a tin-free steel (TFS) with a coater so that the dry film thickness is 2 μm, the maximum temperature of the material is reached. A baked coated plate was obtained at 180 ° C. for 10 minutes. Thereafter, a polyester / melamine-based top coating was applied with a coater to a dry film thickness of 7 μm and baked at 180 ° C. for 10 minutes to prepare an evaluation sample.

〔Evaluation item〕
1-1. Pencil Hardness Test Test Pencil hardness was measured according to JIS-K-5400 using a high-grade pencil defined in JIS-S-6006.

1-2. Workability test test The coated plate was punched into a cap shape with a diameter of about 25 mm and a height of about 17 mm, and then screwed, and then subjected to retort treatment at 125 ° C / 30 minutes to determine the degree of cracking and peeling of the coating film. The determination was made visually according to the following criteria. ○ Above is the practical level.
(Double-circle): There is no crack and peeling at all.
○: There are some cracks and peeling.
Δ: Slightly cracking and peeling
X: Cracking and peeling are remarkable.

1-3. Water resistance test test After the painted plate was treated with hot water at 100 ° C./30 minutes, the degree of whitening of the coating film was visually determined. ○ Above is the practical level.
A: There is no whitening at all.
○: Some whitening is observed. Δ: Whitening is slightly high.
X: Whitening is remarkable.

1-4. Adhesion test test A sample is prepared by punching a painted plate into a cap shape having a diameter of about 25 mm and a height of about 17 mm and then screwing it. A cellophane adhesive tape was affixed to the threaded portion, and the peeled state of the coating film after peeling off was visually determined. After the prototype (before treatment) and hot water treatment at 100 ° C./30 minutes, the degree of cracking and peeling of the coating film was visually determined according to the following criteria. ○ Above is the practical level.
A: No peeling at all.
○: There is some peeling.
Δ: Slightly much peeling.
X: Peeling is remarkable.

1-5. Corrosion resistance test Cross-cut scratches reaching the base steel plate are made on the painted plate. Subsequently, a salt spray test in accordance with JIS 2371 was performed for 72 hours on the coated plate with the cross cut scratches, and the one-side maximum corrosion width from the cross cut scratches was measured.

The evaluation results are shown in Tables 1 and 2.

  From Tables 1 and 2, the corrosion resistance of Examples 1 to 10 has the same corrosion resistance as Comparative Examples 5 and 6 containing heavy metal rust preventive pigments, and there is no conductive polymer containing a dopant or It turns out that the favorable corrosion-resistant performance is hold | maintained compared with Comparative Examples 1-4 which are not in a suitable range. Moreover, it turned out that Examples 1-10 have established the performance requested | required as a primer in the high level.

  INDUSTRIAL APPLICABILITY The present invention belongs to the field of metal coating technology, and can be widely used as an undercoat paint / adhesive (primer) that expresses excellent anticorrosion performance without using heavy metals and a metal laminate used therewith.

Claims (6)

Polyester resin (A), the phenolic resin (B), conducting polymers (C), de Panto (D), and that a resin composition characterized containing rust inhibitor (I),
The polyester resin (A) has a number average molecular weight of 3,000 to 100,000, a glass transition temperature of 10 ° C. to 90 ° C., and the polyester resin (A) is a polyester resin (A−) containing diphenolic acid as an essential component. 1), the ratio of the polyester resin (A-1) and the phenol resin (B) is 60:40 to 95: 5, and the addition amount of the dopant (D) is 1 mol of the conductive polymer (C). The resin composition whose rust preventive agent (I) is tannic acid with respect to 0.01-1.00 mol. Conductive polymer (C) is polyaniline, polypyrrole, polythiophene, polyalkylthiophene, polyalkyldioxythiophene, polyisothianaphthene, polyphenylene, polyfuran, polyphenylene vinylene, polyacene and derivatives thereof, and copolymerization of these monomers The resin composition according to claim 1, which is one or a mixture of two or more selected from products. Furthermore, the resin composition of Claim 1 or 2 containing a metal chelate compound and / or a metal alkoxide compound (E). Furthermore, the resin composition as described in any one of Claims 1-3 containing an epoxy resin (F). Furthermore, the resin composition as described in any one of Claims 1-4 containing a curing catalyst (G). Furthermore, the resin composition as described in any one of Claims 1-5 containing an organic pigment and / or an inorganic pigment (H).