TW200843949A - Highly conducting resin-coated metal sheet - Google Patents

Abstract

The invention relates to a resin coating metal plate having a resin involucra at the surface of the metal plate, which is characterized in that: in the roughness curve of the resin coating metal plate, when the peak value counting level (2H) is set to be 2.54 um, the peak number (PPI) of each 2.54 cm is above 10 and the strident (Rku) in the roughness curve is below 5.0. The resin coating metal plate can show favorable conductivity stably through the composition even under light contact condition of about 10 to 12 gf/mm <2>.

Description

200843949 IX. Description of the Invention [Technical Field] The present invention relates to a resin-coated metal sheet excellent in electrical conductivity. [Prior Art] Conventionally, galvanized steel sheets have been widely used in the fields of home appliances, automobiles, and building materials. In order to improve the corrosion resistance, the fingerprint resistance, the coating film adhesion, and the like of the galvanized steel sheet used in these applications, a resin coating film having a thickness of about πμπι is provided on the surface of the galvanized layer. However, when the galvanized steel sheet is used for a home appliance, in order to stabilize the operation of the electronic device and block the noise, in addition to the above characteristics, the surface of the steel sheet is required to have conductivity (grounding property). However, since the resin film is generally insulative, the formation of a resin film on the surface of the steel sheet causes a decrease in electrical conductivity. On the other hand, in order to ensure conductivity, when the film thickness of the resin film is extremely thin or the resin film is omitted, corrosion resistance and fingerprint resistance are insufficient. In addition, with the recent miniaturization and multi-functionalization of electronic components, the number of components having complicated shapes has increased, and the space in various machines has been limited, and the electrical conductivity of galvanized steel sheets has higher requirements. That is, it is required to ensure sufficient grounding even if it is only in contact with the surface of the electronic component or a weak elastic joint (light contact). In order to provide a steel sheet having the above characteristics, various developments have been made. For example, a precoated steel sheet disclosed in Japanese Laid-Open Patent Publication No. Hei 7-2 6 5 79 1 is a steel sheet back surface whose roughness is controlled to specific Ra and ΡΡΙ. On the top, a coating film containing nickel bismuth is provided to obtain excellent back grounding. In addition, -5- 200843949 The metal material having excellent conductivity disclosed in the Japanese Patent Publication No. 200 5 - 1 3 95 5 1 is a predetermined number of heights of 0.5 to 30 μηι within a certain area of the surface of the metal material. The convex portion has a sharp rise. However, in the technique of Japanese Patent Laid-Open No. 7-2 6 5 711, the conductivity of the metal plate is mainly ensured by the nickel ruthenium contained in the coating film, but the nickel ruthenium may cause deterioration of the corrosion resistance of the metal plate. Furthermore, the use of nickel dip will increase costs. Further, in Japanese Laid-Open Patent Publication No. 2005-139551, the conductivity is excellent, but the conductivity is determined according to the interlayer resistance 値 and the electric conduction weld property defined in JIS C25 50, and in particular, the interlayer resistance 値 is 2 MPa. The contact of the terminal with the test piece under a pressure of ± 5% (about 204 gf/mm 2 ) was measured, so that the metal material could not conform to the electrical conductivity under light contact (pressure 10 to 12 gf/mm 2 ). In addition, in order to ensure the electrical conductivity under light contact, the related art is disclosed in Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. For example, in Japanese Patent Laid-Open Publication No. 2005-23 8 5 3 5, temper rolling is performed by a roller having a predetermined surface roughness Ra and PPI based on the knowledge that the conductivity is affected by the surface texture of the plated original plate. In addition, in order to ensure good grounding property, it is described that the surface roughness (arithmetic mean roughness Ra, filter center line undulation Wca) of the surface-treated galvanized steel sheet is appropriately controlled, as described in Japanese Laid-Open Patent Publication No. 2004-277876. method. SUMMARY OF THE INVENTION In the publication of Japanese Patent Laid-Open Publication No. Hei. No. 200-5-23 8 5 3 5, excellent electroconductivity can be obtained by using an electroplated original plate having a high 200843949 P PI値, but only the surface of the roller is actually defined. Roughness (Ra, Wca). Although the roughness of the roller is transferred to the surface of the rolled steel sheet, the transfer rate is limited, and it is impossible to make the surface of the steel sheet have the same roughness as that of the roller. In addition, the PPI of the surface of the roller is counted at a count level of ±〇·63 8 μηη, and the film thickness of the organic film formed on the surface of the steel sheet is 〇1 to 5 μηι, which can exert electrical conduction during light contact. The convex part may not exist. Further, in Japanese Laid-Open Patent Publication No. 2004-2 77 8 7.6, although Ra and Wca are specified, as will be described later, it is difficult to grasp whether the surface shape is capable of being energized under light contact using only the above parameters. Point effect. In addition, the conductivity evaluation method used in Japanese Laid-Open Patent Publication No. 2005-23 85 35 and Japanese Patent Application Laid-Open No. 2004-277876 is difficult to say for electrical conductivity under light contact. As described above, various characteristics such as the corrosion resistance of the resin-coated metal sheet and how to ensure the conductivity thereof have been variously studied. However, in recent years, electronic components that are increasingly miniaturized and multi-functionalized have been proposed. For use, resin coated metal sheets that meet the requirements for electrical conductivity under light contact are not available. The present invention has been devised in view of the above circumstances, and an object thereof is to provide a resin-coated metal sheet which can stably exhibit excellent electrical conductivity even under light contact of a pressure of about 10 to 12 gf/mm2. The resin-coated metal sheet of the present invention which solves the above problems is a resin-coated metal sheet which forms a resin film on the surface of the metal sheet; in the roughness curve Z (X) of the surface of the resin-coated metal sheet, When the peak count level (2H) is set to 2·54 μηι, the number of 200843949 peaks per 2.54 cm (l 吋) (hereinafter referred to as “PPI”) is 10 or more, and the peak of the above roughness curve is obtained. The degree (Rku) is 5.0 or less. In order to improve the electrical conductivity of a resin-coated metal sheet having a resin film of about 1 μm in light contact, the inventors of the present invention have conducted intensive studies and found that stable electrical conductivity is ensured under light contact. It is related to the number of concavities and convexities on the surface of the resin-coated metal sheet, and the height difference and shape of these uneven portions also have a large influence on the electrical conductivity. Further, based on this in-depth study, it was found that if the resin-coated metal sheet conforms to the above-mentioned PPI and Rku, stable electrical conductivity can be obtained even under light contact conditions. The present invention has thus been completed. The so-called PPI is measured according to the method specified in SAE J91 1 JUN86 (American Automotive Technical Specifications). It is a predetermined height per unit length in the roughness curve Z(x) of the surface of the resin coated metal sheet. The number of the poor peaks and valleys (concave and convex portions) constitutes an index indicating the surface properties of the resin-coated metal sheet. Further, in the present invention, the peak 位 count level (2H) at the time of calculating P PI is set to 2.54 μm. On the other hand, the above kurtosis (Rku) is a enthalpy measured in accordance with JIS B060 1 (ISO 4287: 1 997), which is present per unit length on the roughness curve Z(x) of the surface of the resin-coated metal sheet. The kurtosis index of the peak (convex) or valley (concave). Further, in the resin-coated metal sheet according to the present invention, it is preferable that an average film thickness Y of the resin film on the surface of the resin-coated metal sheet is 1⁄2 μm or less, and the average film thickness Υ and the ΡΡΙ are in accordance with the following formula (1). Relationship. 200843949 Υ ^ 0.003 χΡΡΙ + 0.65 (I) Further, the foregoing resin film containing an organic resin and inorganic fine particles is a preferred embodiment of the present invention. In the resin-coated metal sheet of the present invention, even when the contact pressure between the joint portions of the metal sheets is small, excellent electrical conductivity can be exhibited, and therefore, it is suitable for a frame member such as an electronic device. [Embodiment] The resin-coated metal sheet of the present invention is a resin-coated metal sheet in which a resin film is formed on the surface of the metal sheet, and the roughness curve χ(χ) of the surface of the resin-coated metal sheet is 2.54 each. The number of peaks of cm (l吋) (ΡΡΙ, peak count level 2Η = 2·54 μιη) is 10 or more, and the kurtosis (Rku) of the above roughness curve is 5.0 or less. Further, the roughness curve Ζ(χ) is a curve obtained by measuring with a cut-off value of 〇8 mm in accordance with JIS B0601. As described above, the PPI is an index of the surface properties of the resin-coated metal sheet. In addition, the PPI is measured according to the SAE specification J9U-1 986' as shown in Fig. 1, from the average line of the roughness curve Z(x), to the positive (+) and negative (-) directions. Set a positioning Η (the reference level width between positive and negative = 2 Η), and exceed the negative standard level (-Η, valley part, a in the first picture) and exceed the positive standard level (+ H, The peak portion and b) are defined as "1 count (ICount)", and the number of counts (the number of peak-to-valley counts) per 2.54 cm (l吋) at this time. -9- 200843949 The width of the standard level between the above positive and negative (2H) is called the peak 値 count level 'in the SAE specification' 疋 2Η = 50μίη·(1·27μηι), but in the present invention, 2Η = 2·54μιη (100μίη.). Conventionally, the arithmetic mean roughness Ra of the surface of a metal plate was used as an index of conductivity of a metal plate having a resin film. However, it has been found by the inventors of the present invention that the resin-coated metal sheet having a resin film having a thickness of about 1 μm has a peak in comparison with the arithmetic mean roughness Ra in order to improve the conductivity under light contact. - The valley count (ΡΡΙ) has a higher correlation with conductivity. The reason why the PPI has a high correlation with the conductivity of the resin-coated metal sheet is as follows. Generally, irregularities due to manufacturing conditions and the like are present on the surface of the metal plate. On the other hand, it is estimated that although the general resin belongs to the insulator, the film formed on the convex portion of the metal surface is generally thinner than the concave portion, so When the convex portion comes into contact with the terminal (ground terminal), the convex portion becomes a current point, and electrical conduction is generated to ensure electrical conductivity. Here, the Ra (arithmetic mean roughness) is an index indicating the average of the absolute enthalpy of the roughness curve as shown by the following formula (II), and cannot directly reflect the number of the uneven portions existing on the surface of the metal plate. For example, when the roughness curve is assumed to be a triangular wave, Ra is the same regardless of whether the wave number per unit length is one or 100 as long as the amplitude is the same. At this time, in the former case, since the number of energization points is one, it is easy to imagine that it is difficult to form electrical conduction as compared with the latter (the number of energization points is 100). Therefore, in the case of using the above Ra, even if the Ra is the same, a case where the conductivity is different may occur. On the other hand, as described above, the PPI indicates the number of peak-to-valleys of a predetermined height difference or more existing on the surface of the metal plate, and the measured value is the indirect index of the energization point, and thus has conductivity and conductivity. Further correlation In the present invention, as the peak 値 count level of the PPI described above, 2 Η = 2.54 μιη (100 μίη·) different from the SAE specification described above is used. So far, even when ΡΡΙ is used, the peak 位 count level (2Η = 1.27 μηι) specified by the SAE standard is used, and the idea of using different peak 値 count levels is the subject of how to improve conductivity. The situation does not exist. However, in the process in which the inventors of the present application have intensively studied, it has been found that in the case of a coated metal plate having a film thickness of 1 μm, when the peak 値 count level 2 is set to 2·54 μm, the conduction can be more stably grasped. Sexual tendency. The reason for this is not certain, but it can be presumed as follows. When a resin film is formed on the surface of a metal plate, in general, a resin film is applied onto a metal plate to form a coating film, and then a film is formed by a drying step of evaporating water and a solvent in the coating liquid. In the drying step, although the film is horizontalized to some extent, it does not reach a complete level, and the shape of the metal sheet of the substrate (concavity and the like) is reflected on the surface property of the coating film. Further, according to the results of experiments conducted by the inventors of the present application, it was confirmed that the arithmetic mean roughness Ra was reduced by 10 to 20 ° / 前后 before and after the formation of the resin film. Therefore, for example, in the case of a resin-coated metal sheet having a height difference of 2 Η = 127 μηι after the formation of a film, it is considered that 2H = 1.4 exists on the surface of the metal sheet before the formation of the film -11 - 200843949 ~1 ·6μιη bumps. Here, it is assumed that the unevenness of the surface of the metal plate is a triangular wave, and the coating film is completely horizontalized in the drying step. In this case, as long as the average film thickness is 0.7 to 0.8 μm, the observed 2 Η = 1.4~ before the film formation is calculated. The concavo-convex portion of 1.6 μπι is buried in the film, and the concavity and convexity cannot be theoretically observed after the film is formed. As described above, the surface properties of the film actually reflect the roughness of the substrate, and since the uneven portion having a height difference of 2 Η=1.27 μηη after coating, the film of the convex portion is thinner than the average film thickness. However, it can be presumed that the case where the convex portion having the function of the energization point does not exist is dominant. According to these findings, in the case of forming a film having an average film thickness of about 1 μm, in order to form a convex portion capable of exhibiting a function of a current point on the surface of the resin-coated metal plate, it is estimated that the metal plate before coating can be estimated. It is necessary to have a concavo-convex portion having a minimum of 2 Η = 2 μmη or more, and after the formation of the film, it is necessary to have a concavo-convex portion having more than 2 Η = 1.6 to 1.8 μm m on the metal plate. Based on such a discussion, the results of various experiments were repeated in consideration of the deviation of the film thickness on the production, and in the present invention, 2 Η = 2.54 μηη (100 μίη·) was used as the peak 値 count level. The above enthalpy is 10 or more, preferably 30 or more. When the temperature is too small, the number of energized points for ensuring electrification under light contact becomes insufficient. Further, although the upper limit of the crucible is not particularly limited, since the surface property of the metal sheet is usually mainly derived from the surface roughness of the roll when the metal sheet is manufactured, the viewpoint of preventing the roughness of the roll from being deteriorated and extending the service life of the roll is considered. The upper limit of Ρ Ρ I値 is preferably 2,500 or less, more preferably 2,000 or less. Further, the resin-coated metal sheet of the present invention has a kurtosis (Rkn) of 5.0 or less in addition to the above-mentioned ΡΡΙ-12-200843949 値. In the process of completing the present invention, the inventors of the present invention found that even if ΡΡΙ値 meets the above-mentioned range, there is a case where the conductivity is unstable, and a deeper discussion is focused on this point, and it is obtained in the resin coating. The shape of the convex portion on the surface of the metal plate also has an influence on the conductivity. Here, the kurtosis (Rku) is a 値 which is measured in accordance with the provisions of JIS B0601 (ISO 4287:1 997) and is the fourth power of the roughness curve (the height of the peak) Z(x) in the standard length lr. The average (the following formula (III)) is divided by the fourth power (the following formula (IV)) of the root mean square roughness Rq of the roughness curve. ^ = Z^x)dx] (III)

Rq=][if: ζ2(χ)ύίή (N) The kurtosis (Rku)値 represents the kurtosis of the probability density function of the roughness curve. When Rku is 3, the probability density function is a normal distribution. In addition, the larger the Rku値, the sharper the peak (peak or valley) forming the roughness curve, and the smaller the Rku値, the lower the peak and the higher the height (refer to Fig. 2). That is, the kurtosis (Rku) 値 reflects the peaks or valleys (concave and convex portions) which are present on the surface of the resin-coated metal sheet, and Rku is 5.0 or less, which represents the uneven portion existing on the surface of the resin-coated metal sheet. The shape of the peak (valley) is not extremely sharp. -13- 200843949 This Rku is effective as an index of conductivity, but the reason is not clear, and the inventors of the present invention have inferred this. In the conventional conductivity measurement, when the contact pressure is relatively large and there is a protruding convex portion on the surface of the resin-coated metal plate, first, the convex portion comes into contact with the terminal (such as a ground terminal). At this time, the pressing force of the terminal is concentrated on the protruding convex portion, and the convex portion is deformed. As a result, the terminal or the like can come into contact with the other convex portion (the front end is located below the protruding convex portion), thereby generating electrical conduction. That is, in the conventional conductivity measurement, since the pressing force of the terminal is very large, the influence of the shape of the peak in the roughness curve of the surface is small. On the other hand, in the case of light contact, when there is an extremely protruding convex portion, contact between the terminal and other convex portions (the height difference between the concave portion and the convex portion is small, and the front end is located below the protruding convex portion) is hindered, so that it is difficult to ensure A sufficient point of energization will cause poor conductivity. The above Rku値 is preferably 3.5 or less. On the other hand, although the lower limit is not particularly limited, Rku is preferably 2.0 or more. When Rku値 exceeds 5.0, the number of sharp or extremely high convex portions (concave portions) increases, and as a result, the number of convex portions capable of exerting a point of energization is reduced, and the conductivity tends to be hindered. On the other hand, when the Rku is too small, the shape of the convex portion becomes gentle, and the resin film of the convex portion tends to become thick, and the electric conduction point may not be exerted under light contact. The resin film provided on the resin-coated metal sheet of the present invention can be used as long as it is a material of a resin film which can be used as a resin-coated metal sheet. Specifically, examples of the base resin constituting the main component of the resin film of the present invention include an acrylic resin, a melamine resin-14-200843949, an anthracene resin, an epoxy resin, and an amine ester resin. Polyester resin, poly-amine-based tree fl曰, alkyd resin, poly-hydrocarbon-based resin, sand oxide resin, fluorine-based resin, aminoplast resin, vinyl chloride resin, polycarbonate Resin or the like may be used singly or in combination of two or more kinds. The preferred polyester resin is the "VYL ON (registered trademark) series of products manufactured by Toyobo Co., Ltd., which is available in a wide variety of products. The polyester resin can also be crosslinked with melamine resin. The melamine resin can be used. "SUMIMAL (registered trademark)" manufactured by Sumitomo Chemical Co., Ltd. and "C YMEL (registered trademark)" manufactured by Mitsui-Cytec Co., Ltd. The preferred latex composition is copolymerized with ethylene-unsaturated carboxylic acid. The substance (including the neutralized state) is a main component, and contains a carboxyl group having a boiling point of 1 OOt or less corresponding to 0.2 to 0.8 mol (20 to 80 mol%) of the ethylene-unsaturated carboxylic acid copolymer. The amine, in addition to the 1 mol of the carboxyl group of the ethylene-unsaturated carboxylic acid copolymer, contains a valent metal compound equivalent to 0.02 to 0.4 mol (2 to 40 mol%), and is relative to the solid component. 100% by mass of the latex composition containing 0.5 to 20% by mass of a crosslinking agent having two or more functional groups capable of reacting with a carboxyl group, preferably substantially not containing an amine having a boiling point exceeding 10 ° C ammonia Further, the resin film formed of the above latex composition has excellent corrosion resistance, paintability, lubricity, workability, grounding property, etc., and the related description is described in Japanese Patent Laid-Open Publication No. 2005- 2 6 4 3 1 No. 2. The above-mentioned ethylidene-unsaturated residual acid copolymer is a copolymer of an unsaturated carboxylic acid such as a (meth)acryl-15-200843949 acid, which is polymerized by a known high-temperature high-pressure polymerization method or the like. Obtaining a copolymer. As the copolymer, most preferably a random copolymer, it is also possible to use a block copolymer or an unsaturated carboxylic acid moiety via a graft copolymer. It is also possible to replace a part of ethylene with propylene or 1- Further, an olefin-based monomer such as butene may be partially copolymerized (about 10% by mass or less) using another known vinyl monomer as long as it does not inhibit the object of the present invention. Unsaturated carboxylic acid The copolymerization ratio of ethylene, when the total amount of the monomers is 100% by mass, the unsaturated acid is preferably from 10 to 40% by mass. Since the above ethylene-unsaturated carboxylic acid copolymer has a carboxyl group, by using an organic base and a metal ion processing r can form a latex (water dispersion). At this time, an amine having a boiling point of 10 (TC or less) is used as an organic base, and an amine having a boiling point of more than 100 ° C is likely to remain in the steel sheet when the resin coating film is dried. In addition, the water absorption of the surface film is increased, resulting in poor resistance to uranium. In addition, the above boiling point is the boiling point at atmospheric pressure. Specific examples of the amine having a boiling point of 1 〇 (hereinafter less than TC (hereinafter referred to as "the above amines") include : a tertiary amine such as triethylamine, N,N-dimethylbutylamine, N,N-dimethylallylamine, N-methylpyrrolidine, tetramethyldiaminomethane or trimethylamine; N- a second-grade amine such as methylethylamine, diisopropylamine or diethylamine; a primary amine such as propylamine, tertiary butylamine, secondary butylamine, 1,2-dibutylpropylamine or 3-pentylamine; One of them may be used or two or more of them may be used in combination. Among them, a 3-grade amine is preferred, and a triethylamine is more preferred. The amount of the above amines is 〇·2 to 0·8 mol (20 to 80 mol%) with respect to the carboxyl group 1 mol in the ethylene-unsaturated carboxylic acid copolymer. Within this range, good corrosion resistance can be obtained. When the amount of the above amines is less than 0.2 to 16 to 200843949 mils, the particle diameter of the resin particles in the latex becomes large, and the above effects cannot be exerted; when the amount of the amine exceeds 0.8 mol, the viscosity of the latex composition increases. Gelation is not ideal. The upper limit of the amount of the above amines is preferably 〇 6 mol, more preferably 0.5 mol, and the lower limit of the above amine amount is preferably 〇·3 mol. When the latex composition is prepared, a monovalent metal ion can also be used. It can effectively improve solvent resistance and film hardness. The monovalent metal ion preferably contains one or two or more metals selected from the group consisting of sodium, potassium and lithium, and more preferably a hydroxide, a carbonate or an oxide of these metals. Among them, NaOH, KOH, LiOH, etc. are preferred, and NaOH has the best performance. Further, a compound in which a metal having a valence of 2 or more is added does not have a corresponding effect, and thus it is not used. The amount of the i-valent metal compound is from 0. 02 to 0.4 m mol (2 to 40 mol. / 〇) with respect to the carboxyl group 1 molar in the ethylene-unsaturated carboxylic acid copolymer. When the amount of the above metal compound is less than 0. 0 2 mol, the emulsion stability becomes insufficient. When the amount exceeds 0.4 mol, the hygroscopicity of the obtained resin film (especially for the test solution) increases, resulting in the degreasing step. The corrosion resistance is deteriorated, so it is not preferable. The lower limit of the amount of the preferred metal compound is 0.03 mol, and the lower limit is preferably 0·1 mol; the upper limit of the preferred amount of the metal compound is 〇·5 mol, and the lower limit is preferably 0·2 mol. . The preferred amounts of each of the above amines and the above-mentioned monovalent metal compound are as described above, and are used for gelling by neutralizing a carboxyl group in the ethylidene-unsaturated residual acid copolymer. Therefore, when the total amount (neutralization amount) is too large, the viscosity of the latex composition rises sharply and solidifies, and the excess alkali component causes deterioration of corrosion resistance, and it takes a large amount of energy to volatize to -17-200843949. 'So not ideal. However, if the amount of neutralization is too small, the emulsifying property will not be deteriorated. Therefore, it is preferred that the amount of the above amine and the above monovalent compound is 0 · 3 to 1 with respect to the carboxyl group 1 molar in the ethylene-acid copolymer. In the step of neutralizing the ethylene carboxylic acid copolymer by the above amine and the above monovalent metal ion (lactification step), preferably an amine of 1 00 ° C or lower and a monovalent metal compound are added substantially simultaneously. In the case where the amine having a boiling point of 100 ° C or less is added to the copolymer, the reason for the copolymerization is not clear, but when the amine having a boiling point of 100 ° C or less is added, the effect of improving the corrosion resistance may be insufficient. A crosslinking agent having two or more reactive functional groups is blended in the latex composition. In order to chemically crosslink the above ethylene-unsaturated polymer, the film strength is increased. Preferably, the solid content of the latex composition is 1 〇 〇 mass ° /. The amount of the crosslinking agent is (% is preferably 5 to 10% by mass). When the amount is less than 1% by mass, the chemical crosslinking effect is insufficient, and the effect of improving the corrosion resistance is difficult. On the other hand, when the amount is more than 20% by mass, the resin film is excessively high, and the hardness is increased, and the press processing is performed. At the time, the metal plate is deformed to cause cracks, resulting in corrosion resistance and lowering. Further, the amount of the crosslinking agent is preferably appropriately changed depending on the amount of the carboxyl group in the copolymer with respect to the ethylene-unsaturated carboxylic acid, and is usually 0.5 to 0.5 part by weight of the copolymer 'crosslinking agent. 50 parts by weight (more preferably 5 to 20 parts by weight). One or more of the desired ones which are capable of reacting with a carboxyl group in one molecule, the unsaturated carboxylic acid metalloxide-saturation is added to the copolymer. The copolymer 〇 is sufficient to coexist with a carboxyl group and a carboxylic acid, and is produced in association with a bond of 1 to 20 mass. Further, the crosslinking agent is not particularly limited as long as it does not follow the amount of the crosslinking agent, and the crosslinking agent is preferably a functional group. The -18-200843949 crosslinking agent is not particularly limited, and examples thereof include sorbitol polyglycidyl ether. (poly)glycidyl polyglycidyl ether, pentaerythritol polyglycidyl ether, trimethylolpropane polyglycidyl ether, neopentyl glycol diglycidyl ether, poly(glycidyl ether) (poly)ethylene glycol diglycidyl ether a glycidyl group-containing crosslinking agent such as polyglycidylamine; 4,4 '-bis(ethyleneiminecarbonylamino)diphenylmethane, N,N'-hexamethylene-1,6 - bis(1-aziridinecarboxy decylamine), N,N'-diphenylmethane-4,4'-bis(1-aziridinecarboxy decylamine), toluidine diaziridine carboxy decylamine, etc. Bifunctional aziridine compound; tris-1 -aziridine phosphine oxide, tris[1-(2-methyl)aziridine]phosphine oxide, trimethylpropane tris(β-aziridine propionic acid Trifunctional or higher aziridines such as esters, tris-2,4,6-(1-aziridine)-1,3,5-triazine, tetramethylpropane tetraaziridine propionate Compound; or its A glycidyl group-containing crosslinking agent such as a derivative. One type or two or more types may be used. Among them, a crosslinking agent containing an aziridine group is preferred. Further, a polyfunctional aziridine and a monofunctional aziridine (ethyleneimine) can also be used at the same time. In the above latex composition, a wax may also be contained. When the wax is contained in a range of 0.5 to 20% by mass (preferably 0.5 to 10% by mass, more preferably 0.5 to 5% by mass) in terms of solid content, lubricity and scratch resistance of the obtained resin film are obtained; Deep drawing, punching, and mold wear resistance necessary for hole processing; good blackening resistance of sliding surface during processing. However, when the wax content is too high, the wax may soften, liquefy or bloom, and concentrate to the interface of the resin film and the post-coating film or the interface between the surface modifying layer and the resin film, resulting in degreasing. Corrosion resistance and the like are deteriorated. The wax is not particularly limited, and any of known waxes such as microcrystalline wax, paraffin wax, etc., synthetic wax such as polyethylene, or a mixture thereof may be used. It is preferred to select a wax having a softening point of 80 to 140 °C. The most suitable wax is a spherical polyethylene crucible, and the average particle diameter is preferably from 0.1 to 3 μm (more preferably from 0.3 to 1.0 μm). This can significantly improve the lubricity, punchability, mold wear resistance, and deep drawability of the resin film. As the spherical polyethylene crucible, for example, "DYEDIT Ε-17" (manufactured by Mutual Chemical Co., Ltd.); "KUE-1", "KUE-5", "KUE-8" (manufactured by Sanyo Chemical Industries, Ltd.); "CHEMIPEARL" can be used; "(registered trademark)" series (manufactured by Mitsui Chemicals, Inc.) "W-1", "W-200", "W-300", "W-400", "W-500", "W- 640,,, "W-700", etc., or a commercial product such as "ELEPON Ε-20" (made by Rihua Chemical Co., Ltd.). The latex composition used in the present invention preferably contains ethylene which is an essential component. A crosslinking agent such as an unsaturated carboxylic acid copolymer, the above-mentioned amine, a monovalent metal compound or an aziridine compound, or the like, which is used as needed. Preferably, it is adjusted to an aziridine compound or a wax or other additive component. The amount of the resin component such as the ethylene-unsaturated carboxylic acid copolymer is 50% by mass or more based on the solid content of the latex composition. The preparation method of the above latex composition is as follows: First, copolymerization of an ethylene-unsaturated carboxylic acid having an essential component The substance is put into homogenization together with the aqueous medium. In the middle, if necessary, the mixture is heated to 70 to 0.25 ° C, and the above amines and monovalent metal compounds are appropriately added as an aqueous solution or the like (the above amines are added first, or the above amines and monovalent metal compounds are added substantially simultaneously). The stirring is carried out with high shear force. The hydrazine and the crosslinking agent can be added at any stage. In order to avoid gelation after the crosslinking reaction progresses after the addition of the crosslinking agent, heating is not carried out at -20-200843949. Preferably, the average thickness of the resin film of the present invention is not more than 1.2 μm, more preferably 0.1 to Ι.Ομιη, particularly preferably 0.2 to 0.8 μm. When the resin film is too thick, it is difficult to ensure conductivity under light contact. Conversely, when the resin film is too thin, it may be difficult to obtain the effect of providing a resin film (corrosion resistance and decorative property). Further, in addition to the method described in the examples, the following method may be used to determine the thickness of the resin film. First, gold (Αι〇 vapor deposition is applied so as to cover the surface of the metal plate coated with a resin of 20 X 20 mm, and the resin is coated with a metal plate to expose the cut surface (end portion)). Embedding into the resin, honing the cut surface (end section) of the resin-coated metal plate, and adjusting the measurement sample. Then, taking the acceleration voltage of 20 kV and the magnification of 5,000 times, the surface section of the sample was taken. The SEM (scanning electron microscope) photograph was used to measure the thickness of the resin film according to the photograph. The film thickness was measured at any three positions, and the film thickness at any three positions of one photograph was measured, and the film thickness was calculated from a total of nine positions. The average 値 is the average film thickness of the resin. In the resin-coated metal sheet of the present invention, the average film thickness Y of the resin film provided on the resin-coated metal sheet and the PPI are preferably in accordance with the following formula (I). )Relationship. Y ^ 0.0 03 XPPI + 0.65 (I) As described above, general resins have insulating properties, and the thickness thereof greatly affects the electrical conductivity of the resin-coated metal sheet. On the other hand, the PPI has the same effect on the influence of the conductivity, and the present invention sends a deep correlation between the film thickness and the PPI in accordance with the above relationship. The resin is coated with gold to obtain excellent electrical conductivity. Further, the above resin film contains fine inorganic fine particles in a preferred embodiment. This is because when the inorganic fine particles are contained, the hardening tends to occur, and when the ground terminal or the like is in contact with the resin film, micro-cracks are generated and electrical conduction occurs, which is more preferable as the preferable inorganic fine particles, and the shape and calcium ion exchange are exemplified. Type of cerium oxide; and oxides of Al, Ti, Fe, Sn, Mg, Ca, Zn, etc., and hydric acid, nitric acid, carbonic acid, etc., and Al, Μη, Mg, Ca, Ni molybdate, tungstate, Vanadate, phosphomolybdate, etc. The 50% by volume of these inorganic fine particles measured by the (disorganized type) is 1 to 100 nm, more preferably 2 to 20 nm. The inorganic fine particle film is preferably from 5 to 80% by mass. The amount of the inorganic fine particles is obtained by adding the inorganic fine particles. Conversely, when the inorganic fine particles are used, the amount of the resin in the film is relatively decreased, and the amount of the inorganic fine particles having a better film volume is 10 to 75% by mass, particularly preferably: The original plate of the resin-coated metal plate, the copper plate, the cold-mild steel plate, the hot-dip galvanized steel sheet, and the electro-galvanized steel are preferably galvanized steel sheets, and are used for applications other than conductivity, such as corrosion, aesthetics, and dimensional accuracy ( For example, it is preferable to use an electrogalvanized steel sheet for the home 1. It is known that the flat sheet can be stabilized by the resin film of the present invention, and the point of energization is ensured in the inorganic material. 'Stone (cerium oxide) C e, S b, Zr, a metal salt of phosphoric acid, sulfur, or the like, and an average amount of the average particle diameter by a laser diffraction method. When the amount of the resin is small, it is difficult to obtain a large amount of particles, and cracks are likely to occur. Jue 20 to 70% by mass. In the case of the above-mentioned electrogalvanized steel sheet, for example, an electrogalvanized alloy in which zinc and an iron group element (Fe, Co, Ni) are alloyed, for example, in the case of a corrosion-resistant type, etc., -22-200843949 Board. From the viewpoint of ensuring formability, it is preferred to control the content of the iron group element to be about 5 to 20% by mass in any case. The adhesion amount of the plating layer is preferably 50 g/m2 or less, more preferably 40 g/m2 or less, and particularly preferably 35 g/m2 or less. In the case of an electrogalvanized steel sheet, it is usually 20 g/m2. The lower limit of the amount of plating adhesion is not particularly limited, but the lower limit is preferably 5 g/m2, more preferably 10 g/m2 in view of corrosion resistance. Next, a method of producing a resin-coated metal sheet of the present invention will be described. The resin-coated metal sheet of the present invention is preferably prepared by preparing a raw material composition of a resin film, and then applying the raw material composition to a metal plate for drying. The raw material composition is prepared by dispersing a matrix resin, a crosslinking agent or the like added as needed, in water or diluting with an organic solvent or the like to prepare a concentration or viscosity suitable for coating. The organic solvent is not particularly limited, and examples thereof include aromatic hydrocarbons such as toluene'xylene; aliphatic esters such as ethyl acetate and butyl acetate; alicyclic hydrocarbons such as cyclohexane; and hexane and pentane. Such aliphatic hydrocarbons; ketones such as methyl ethyl ketone and cyclohexanone, and the like. The solid content concentration history of the raw material composition is preferably about 5 to 35 mass%. Various known additives for use in the field of resin-coated metal sheets, such as a matting agent, an extender pigment, a rust preventive, a sedimentation inhibitor, and a wax, may be added to the raw material composition as long as the object of the present invention is not impaired. The method of applying the above-mentioned raw material composition to a metal plate is not particularly limited, and a bar coating method, a roll coating method, a spray coating method, a curtain coating method, or the like can be employed. It is dried after coating, but when a crosslinking agent is added, it is preferably dried by heating at a temperature at which the crosslinking agent can react -23-200843949. Specifically, it can be dried by heating at a temperature of 40 to 250 ° C for about 1 to 60 seconds. Further, in order to achieve the effects of improving the corrosion resistance and the adhesion to the resin film, a known surface treatment (underlayer treatment) such as chromate treatment or phosphate treatment may be applied to the metal sheet in advance. However, when considering environmental pollution and the like, it is preferred to use a metal plate which is not subjected to chromate treatment. In addition, in order to obtain a resin-coated metal sheet that conforms to the above-mentioned PPI値, Rku値 (hereinafter, collectively referred to as “surface roughness characteristics”), a metal plate (steel plate or galvanized steel sheet) used as an original plate is produced. When it is recommended to adjust the surface roughness in advance. In particular, when an electrogalvanized steel sheet is used as the original sheet, the galvanized layer is formed substantially along the unevenness on the surface of the steel sheet. Therefore, it is preferable to adjust the surface roughness of the steel sheet on which the galvanized layer is formed in advance. Specific examples of the method for adjusting the roughness characteristics (PPI, Rku) of the surface of the metal sheet include a calender roll which is subjected to a dull process by sandblasting, electric discharge machining, laser processing, or lithography. The original plate is subjected to tandem rolling, reverse rolling or quenching and temper rolling, and may be a method of directly performing sandblasting and etching on the original plate. A preferred method is to subject the cold rolled and annealed metal sheet to a quenched and tempered sheet under a corresponding sheet thickness using a roller having a specific PPI. In particular, in order to control the Rku値 on the surface of the metal plate, it is necessary to control the surface Rku値 of the calender roll and sufficiently transfer the surface unevenness of the calender roll to the surface of the metal plate. Regarding the control of the Rku値 on the surface of the calender roll, by increasing the PPI of the calender roll -24-200843949, the peaks and valleys are uniformly formed on the surface of the calender roll, and as a result, the desired Rki! At this time, the surface Rku値 of the calender roll is preferably about 3. As the calender roll, it is preferred to use a PPI 値 (peak 値 2 Η = 2.54 μηη) of the surface of the roll of 200 to 300 00. It is better to use more than 190 PPIs. In order to control the roughness characteristics of the surface of the calender roll, it is preferred to carry out the processing of the calender roll by discharge matting. In the discharge matting process, the honed rolls are immersed in the oil at a certain distance from the surface of the rolls so that the electrodes are opposed to each other and discharged between the rolls and the electrodes to form irregularities on the surface of the rolls. According to the discharge extinction process, by controlling the interval, current, and voltage, it is easy to form peaks and valleys of uniform height and depth, and it is also possible to increase ΡΡΙ値. As a method of processing the roller, there are also sandblasting and matting processing, laser beam extinction processing, and electron beam extinction processing. Among them, electrical discharge machining and sandblasting and matting are generally used. In addition, as a condition of the tempering pressure delay, for example, when the thickness of the metal plate (steel plate) is 0.4 to 2.0 mm, it is recommended to set the reduction ratio to 0.5 to 3% (more preferably 0.8 to 2.5%), and the unit tension It is set to 1 to 151^factory 1111112 (more preferably 3 to 13 kgf/mm2), and the line load is set to 100 to 650 kgf/mm (more preferably 150 to 600 kgf/mm). In particular, in order to sufficiently transfer the surface unevenness of the roller to the surface of the metal plate, it is recommended to set the ratio of the unit tension to the line load "unit tension/line load" to be less than 〇30. The above unit tension refers to the force by which the metal sheet is stretched in the traveling direction, and the line load refers to the force applied by the roller to the metal sheet. That is, the above "single-25-200843949 yuan tension / line load &lt; 0.03 0" represents that the line load is greater than the unit tension (or the unit tension is less than the line load), due to the pressure exerted by the roller on the metal plate, on the other hand, acting on Since the tension in the traveling direction of the metal plate is small, the variation in the thickness of the plate is small. Therefore, the surface properties of the roller are easily transferred to the metal plate. The ratio of the unit tension to the line load is preferably 〇 〇 2 8 or less, more preferably 0.0 2 5 or less. The steel sheet after quenching and tempering as described above can be directly applied to the formation of a resin film. However, in order to improve corrosion resistance and the like, it is preferred to provide a plating layer on the surface thereof. For example, in the case of electroplating, the steel sheet after quenching and tempering is passed through a horizontal plating apparatus including an energizing portion (a combination of a metal contact roller that holds the steel sheet horizontally conveyed upside down and a rubber-made support light). In the horizontal plating apparatus, the surface of the metal plate is subjected to alkali elution, electrolytic degreasing, water washing, and sulfuric acid pickling, and then subjected to cathodic electrolysis in a metal plating bath to form a plating layer. Then, after the surface of the metal plate is washed with water, the raw material composition of the resin film is applied by a kiln coater or the like, and the solvent (moisture) is evaporated and dried by a dryer to obtain a resin having a resin film on the surface of the plating layer. Painted metal plates. The resin-coated metal sheet of the present invention has the above-described surface roughness characteristics. For example, when used as a casing of an electronic device, the surface having a specific surface roughness characteristic is located inside the casing. (Examples) Hereinafter, the present invention will be specifically described by way of examples, but the present invention is of course not limited to the following examples, and may be appropriately modified within the scope of the above-mentioned and hereinafter referred to as -26-200843949. Implementation 'all of these are included in the technical scope of the present invention. Experimental Examples 1 to 30 After low-carbon aluminum-bismuth steel was cold-rolled into steel sheets having thicknesses of 0.5 mm, 0·8 mm, and 1.0 mm, degreased, washed, and annealed, and tempered under the conditions shown in Table 1. Calendering. The P P 1 辊 of the roller used at this time is also shown in Table 1. The steel sheet in which the P P I 辊 of the roller is 190, 2 2 0 is a steel sheet in which the surface of the roller is subjected to discharge extinction processing. The steel sheet having a PPI 値 65 is a steel sheet which is subjected to sandblasting and matting on the surface of the roller. Next, the quenched and tempered steel sheet was passed through a horizontal plating apparatus, and electrogalvanization was carried out in the following procedure. The adhesion amount of the electrogalvanized layer is shown in Table 2. (I) Alkali-eluting fat step: Degrease the surface of the steel plate with 3% sodium citrate aqueous solution at 6 (TC temperature) (II) Electrolytic degreasing, water washing step: using 3% sodium citrate aqueous solution, at 60 Under the conditions of ° C and 20 A/dm 2 , the surface of the steel sheet was subjected to electrolytic degreasing and then washed with water. (III) Pickling and water washing steps: The steel sheet was pickled with a 5% sulfuric acid aqueous solution at normal temperature, and then washed with water. (IV) Electroplating zinc and water washing step: electrogalvanizing is carried out under the following plating liquid composition and conditions, and then washed with water.

ZnS04 · 7H20 : 300~400g/l Na2S04 : 50 ~100g/l -27- 200843949 H2SO4 : 25 ~35g/l • Current density: 50~200A/dm2 • Plating solution temperature: 60°C • Plating solution flow rate: 0.8 ~2.4 m/sec Two types of coatings (film A, film B) having different compositions were formed on the surface of the obtained galvanized steel sheet. [Surface A (Organic Membrane)] The electrogalvanized steel sheet which was dried after the electroplating of zinc or the water washing step was applied to the treatment liquid A having the following composition by a bar coating method, and baked. The average film thickness of the film A after baking is as shown in Table 2. The composition and baking conditions of the treatment liquid A used at this time are as follows (resin type: A). • Preparation of the treatment liquid A: 20% by mass of a melamine-based crosslinking agent is added to the polyester resin ("VYLON (registered trademark) 245"; manufactured by Toyobo Co., Ltd.; solid content of the resin is 1% by mass) ("SUMIMAL (registered trademark) M-40ST"); manufactured by Sumitomo Chemical Co., Ltd.), and then diluted with a mixed solvent of xylene and cyclohexanone (1:1 (mass ratio)) to adjust to treatment liquid A. The solid content of the obtained treatment liquid A was 1% by mass. • Baking conditions: The treatment liquid A is applied by a bar coating method on the surface of the steel plate after electroplating, water washing, and drying, and then reaches the plate temperature at a furnace time of 50 seconds (TC conditions in a hot air drying oven) Drying is carried out to form a film on the steel sheet (N 〇. 1 to 2). [Pot! Wu B (Organic-Inorganic Film)] -28- 200843949 Treatment liquid B (latex composition) by bar coating The coating was applied to a steel sheet after electroplating and water washing, and the water was evaporated to dry the coating film. The average film thickness after drying was as shown in Table 2. Further, the treatment liquid B was prepared as follows, and the film was dried as follows. Condition: • Preparation of treatment liquid B: 62 parts by weight (hereinafter referred to as "parts") of water and 160 parts of ethylene-acrylic acid copolymer (acrylic acid 20% by mass, melt index (MI) were added to the autoclave 3 00), adding 40 mol% of triethylamine and 15 mol% of NaOH to the carboxyl group 1 molar in the above ethylene-acrylic acid copolymer, and performing high speed at 150 ° C and 〇 5 MPa atmosphere Stirring to make a latex of ethylene-acrylic acid copolymer. To the latex, 4,4'-bis(ethyleneiminecarbonylamino)diphenylmethane ("CHEMITITE" (" CHEMITITE" (" CHEMITITE" (solid content: 100% by mass of the latex composition, the same below) was added to the latex. Registered trademark) DZ-22E; Nippon Shokubai Co., Ltd., and 5% by mass solid content of glycidyl-based compound ("EPICLON" (registered trademark) CR5L (hereinafter referred to as "CR5L"); Otsuka ink chemical industry Co., Ltd.; a solid content of 30% by mass of cerium oxide particles having a particle diameter of 10 to 20 nm ("SNOWTEX"; manufactured by Nissan Chemical Industries, Ltd.); solid content of 5% by mass, softening point of 120 ° C, average particle size A spherical polyethylene wax having a diameter of 1 μm ("CHEMIPEARL (registered trademark) W-700"; manufactured by Mitsui Chemicals Co., Ltd.), and then mixed and stirred to prepare a latex composition (treatment liquid Β). The solid of the latex composition was prepared. The composition is 15% by mass. • Drying conditions: The obtained latex composition is applied by a bar coating method on a steel plate after the electroplating and water washing steps, and then at a wind temperature of 2 0 0 ° C and a wind speed of 5 3 m / s ec, drying time 1~2 Drying was carried out, and an organic-inorganic film (No. 3 to 30) was formed on the steel sheet in the form of -29-200843949. The respective test materials of the obtained resin-coated metal sheets were evaluated according to the following evaluation methods. The results are shown in Table 2. The relationship between the film thickness, pPI 値 and the conductivity of the resin-coated metal sheet is shown in Fig. 3. In addition, in Fig. 3, Δ indicates the result of No. 2 and # indicates The result of ν〇·3~18, the result of ▲No.B~25, and the result of χΝο·26~30. [Evaluation method]

(1) PPI in accordance with SAE (Society of Automotive engineers) J91 1-1986

To determine the PPI値. In addition, the peak 値 count level is set to 2 Η = 2.54 μιη. The surface roughness shape measuring device ("SURFCOM 1 400A-3DF"; manufactured by Tokyo Precision Co., Ltd.) was used for the measurement. In addition, when measuring the flaw of the surface of the roller used for the modulation and pressure delay, a small surface roughness measuring device SURFTEST SJ-301"; Mitutoyo system was used. The measurement was at a cutoff of 値0.8 mm, and the tip radius of the stylus was R: 2μηι ( The stylus portion is regarded as a spherical shape, and the measurement length is 2 5.4 mm (in the case of a roller, the measurement length is 4 mm, and the measured 値 is converted into 値 when the measurement length is 25.4 mm). It is two positions in the same direction, two positions in the direction perpendicular to the direction (in the case of a roller only in the width direction), and the average 値 is calculated as the PPI of the surface of the film or the surface of the roller. (2) Peak Degree (Rku) The peak value is measured in accordance with JIS B060 1 (ISO 4287: 1 997). The measuring device uses the same surface roughness shape measuring instrument as the PPI measurement ("SURFCOM 1400A-3DF" "Tokyo Precision Co., Ltd." The measurement conditions are cutoff 値〇8 mm, stylus tip radius R: 2 μιη (the stylus portion is considered to be spherical)' measurement length 2 5.4 mm. In addition, 'measurement position is 2 in the same * direction, With the Two of the directions in the direction perpendicular to each other were calculated, and the average 値 was calculated as Rku値 on the surface of the film. In addition, only the kurtosis of the organic resin film steel plate was measured. (3) The amount of zinc adhered was measured by a fluorescent X-ray analyzer ( "MXF-2100" (manufactured by Shimadzu Corporation) to measure the amount of zinc adhered on the metal plate. When measuring the amount of zinc adhesion, a calibration curve indicating the relationship between the zinc content and the intensity of the fluorescent X-ray is prepared in advance, according to the calibration curve. The amount of zinc adhesion is determined. (4) Average thickness of the resin film (4-1) About the film A: The film A is swollen with a solvent (N-methyl-2-pyrrolidone), which is removed from the surface of the steel sheet, and the film is removed. The difference in the quality of the steel sheet before and after A and the peeling area of the film were calculated, and the average film thickness (μιη) was obtained by dividing the specific gravity of the resin A. (4-2) About the film Β: by X-ray analysis The amount of Si derived from the cerium oxide particles (cerium oxide) contained in the film enamel was measured by the method. The fluorescent X-ray analyzer was "MXF-2 100" manufactured by Shimadzu Corporation. Pre-made to indicate the amount of S i and the intensity of the fluorescent X-ray The calibration curve determines the Si content in the film based on the calibration curve. Root-31 - 200843949 According to the obtained Si content (fluorescent X-ray 値) 値, the specific gravity is converted to calculate the mass of the film B, and the average is obtained. Thickness ί(μιη). The specific conversion method is as follows: ΐ(μιη) = _[汾 content (mg/m2)]_ [4] x [«02 mass ratio Μ resin film specific gravity you / m3)] [Si/SiO2] = 28/60 Mass ratio of Si〇2 = 0.3 (5) Conductivity

Using a detector ("MULTI-TESTER CX-2 5 0 " manufactured by CUSTOM Co., Ltd.), the electric resistance of the surface of the resin-coated metal plate was measured in the following order. As shown in Fig. 4, the angle between the two terminals and the resin film was maintained at 45° during the measurement, and the terminal was slid about 3 mm in the longitudinal direction of the test piece at an average speed of 10 mm/sec. The measurement is carried out under light contact. The pressure at the time of measurement is only the self-weight of the terminal (7 g, pressure: about 1 isf/mm2). After 1 second after the start of the measurement, the 値 (resistance 値) is stabilized after the measurement. value. The measurement position was changed during the operation, and the measurement was performed five times in total. The average 値 was regarded as the resistance 値. The evaluation of the resistance 値 of 50 Ω or less was excellent; the evaluation of 100 Ω or less was good; the evaluation of 2 〇 Ω Ω or less was possible; and the evaluation of more than 200 Ω was bad. -32- 200843949 [Table 1] Quenching and rolling conditions No. Thickness roll PPI Rolling rate unit tension line load unit tension (mm) (%) (kg/mm2) (kg/mm) / line load 1 1.0 190 2.5 3.3 250 0.013 2 1.0 220 2.5 3.3 155 0.021 3 1.0 190 1.5 3.4 185 0.018 4 0.8 190 1.0 4.5 160 0.028 5 1.0 220 1.5 3.3 155 0.021 6 0.5 220 1.5 5.0 320 0.016 7 1.0 190 2.0 4.2 290 0.014 8 1.0 190 2.5 3.3 250 0.013 9 0.5 190 2.5 9.3 410 0.023 10 0.5 190 2.0 9.2 490 0.019 11 0.5 220 1.5 9.5 440 0.022 12 0.8 190 1.0 4.5 165 0.027 13 1.0 220 1.5 4.3 170 0.025 14 0.5 220 1.5 7.6 270 0.028 15 1.0 220 1.5 4.3 210 0.020 16 0.5 220 1.0 6.0 400 0.015 17 0.5 220 1.5 5.0 300 0.017 18 0.5 220 1.5 9.5 440 0.022 19 1.0 190 1.5 3.5 185 0.019 20 0.5 165 1.5 6.6 280 0.024 21 1.0 190 1.5 3.4 185 0.018 22 0.5 190 1.5 6.6 260 0.025 23 0.8 190 1.0 4.5 165 0.027 24 0.5 190 2.5 9.3 410 0.023 25 0.5 220 1.5 9.5 440 0.022 26 0.5 165 1.0 6.6 220 0.030 27 0.5 165 0.8 6.8 200 0.034 28 0.5 220 1.0 7.9 200 0.040 29 0.5 220 1.0 9.3 170 0.055 30 0.5 165 1.0 7.5 180 0.042 -33- 200843949 [Table 2] Resin coated metal plate No. Zn (g/m2) Film type film thickness (μιη) PPI Rku Conductivity 0.003 χΡΡΙ+0.65 1 17 A 0.8 130 2.3 Good 1.04 2 18 A 0.7 100 2.6 Good 0.95 3 16 B 0.7 40 2.3 Excellent 0.77 4 17 B 0.7 60 2.3 Excellent 0.83 5 18 B 0.6 100 2.8 Excellent 0.95 6 16 B 0.5 110 2.7 Excellent 0.98 7 17 B 0.7 130 2.8 Excellent 1.04 8 17 B 0.8 130 2.4 Excellent 1.04 9 18 B 0.8 140 2.6 Excellent 1.07 10 18 B 0.7 160 2.7 Excellent 1.13 11 17 B 0.5 170 2.4 Excellent 1.16 12 17 B 0.7 100 2.1 Excellent 0.95 13 18 B 0.6 110 2.9 Excellent 0.98 14 18 B 0.6 30 3.3 Excellent 0.74 15 19 B 0.3 130 2.9 Excellent 1.04 16 17 B 0.4 120 2.3 Excellent 1.01 17 17 B 0.9 110 2.6 Excellent 0.98 18 17 B 1.1 165 2.3 Excellent 1.15 19 19 B 0.7 20 2.4 Good 0.71 20 17 B 0.7 70 4.1 Good 0.86 21 16 B 0.8 35 2.6 Available 0.76 22 19 B 0.9 70 2.2 Available 0.86 23 17 B 1.0 95 2.3 Available 0.94 24 18 B 1.1 140 2.6 Available 1.07 25 17 B 1.3 160 2.3 Available 1.13 26 17 B 0.7 50 5.4 Bad 0.80 27 17 B 0.6 15 6.0 Bad 0.70 28 18 B 0.7 15 5.4 Bad 0.70 29 18 B 0 .6 5 2.7 Bad 0.67 30 18 B 0.7 3 4.7 Bad 0.66 -34- 200843949 It can be seen from Table 2 that the resin coated metal sheets of No. 1 to 25 have a ppi 値 of 10 or more and a kurtosis (Rku) of 5 Hereinafter, good electrical conductivity is exhibited. The average film thickness Y and PPI ' of the resin film are in accordance with the relationship of the formula (Ι^) (γ^ 0·003 χΡΡΙ + 0·65), and in the case where the resin film contains an organic resin and inorganic fine particles, it is easy to obtain a good one. Electrical conductivity. On the other hand, in the resin-coated metal sheets of No. 26 to 28, the Rku値 exceeds 5′, although the convex portion is present on the surface of the resin-coated metal sheet, the shape of the convex portion does not contribute to the conductivity, and therefore cannot be Get conductivity. In the example of Νο·29 and 30, it can be considered from Rku値 that the shape of the convex portion contributes to the conductivity, but since the number of convex portions is small (PPI 値 is less than 10), the number of energization points is small, so that good results cannot be obtained. Electrical conductivity. Further, as is clear from Table 1, by making the unit tension/line load less than 〇·〇30, a resin-coated metal plate having a preferable PPI値 and Rku値 can be obtained. The resin-coated metal sheet of the present invention exhibits excellent electrical conductivity even under light contact pressure of about 10 to 12 gf/mm 2 , and is therefore suitable for use in an electronic device, an electrical device, an optical device, and a home appliance. material. [Simple description of the diagram] Figure 1 is a description of the PPI. Figure 2 is a description of Rku's mourning. Fig. 3 is a graph showing the relationship between the film thickness and the PPI 値 and the conductivity of the resin-coated metal sheet, according to the results of the examples. -35- 200843949 Figure 4 is a diagram showing the conductivity test employed in the examples. [Main component symbol description] a : Valley part b : Peak part -36-

Claims (1)

200843949 X. Patent Application No. 1 · A resin-coated metal plate is a resin-coated metal plate in which a resin film is formed on the surface of a metal plate, and the peak value of the resin is coated in the roughness curve of the resin-coated metal plate. When (211) is set to 2.54 and 111, the peak number (??1) per 2.54 (:111) is 1 or more, and the kurtosis (Rku) of the above roughness curve is 5.0 or less. In the resin-coated metal sheet according to the above aspect, the resin film of the surface of the resin-coated metal sheet has an average film thickness Y of 1.2 μm or less, and the average film thickness Y and the PPI satisfy the relationship of the following formula (I). The resin-coated metal sheet according to claim 1 or 2, wherein the resin film contains an organic resin and inorganic fine particles.