JPH0260741A - Resin coated metal plate and production thereof - Google Patents

Abstract

PURPOSE:To enhance incombustibility, corrosion resistance, weatherability and processability by providing an adhesiveness modified polyolefin resin layer to the surface of a metal plate and further providing a resin film layer thereon. CONSTITUTION:A steel plate 1 is sent out from an unwinding roll 8 to be coated with an epoxy resin by a coating device 11 while the coated plate 1 is baked and dried by a dryer 12 to be coated to form a chemical treatment layer and a primer is formed on said layer. A polyethylene film 14 consisting of an adhesiveness modified polyethylene resin layer and a polyethylene resin layer is inserted between press bonding rolls 17 from a supply roll 13 through guide rolls 15, 16 to be laminated to the steel plate at 190 deg.C. Flame treatment is applied to the laminated plate by a flame treatment device 18 to form the adhesiveness modified polyethylene resin layer and the polyethylene layer. A thermosetting polyester resin is applied to the laminated plate using a coating device 19a, and baked and dried in a dryer 20 to form a rosin film layer. A plating layer 2, the chemical treatment layer 3, the primer 4, the adhesiveness modified polyethylene resin layer 5, the polyethylene resin layer 6 and the resin film layer 7 are laminated and formed to the steel plate 1.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a resin-coated metal plate used for building materials, home appliances, vehicles, etc., and a method for manufacturing the same. The present invention relates to the resin-coated metal plate having excellent workability and a method for manufacturing the same.

[Conventional technology]

Resin-coated metal sheets used for building materials, home appliances, vehicles, etc. have traditionally been coated with thermosetting polyester resin, on top of steel sheets, galvanized steel sheets, aluminum-zinc alloy plated steel sheets, aluminum-plated steel sheets, stainless steel sheets, etc. Thin-film resin-coated steel sheets coated with silicone polyester resin, fluororesin, etc. by painting, or coated with vinyl chloride resin, polyolefin resin, etc. by painting or laminating in a film. Thick-film resin-coated steel plates and the like are used.

[Problems to be Solved by the Invention] However, thin-film resin-coated steel sheets coated with thermosetting polyester resin, silicone polyester resin, fluororesin, etc. have excellent nonflammability because the thickness of the coated resin layer is thin. , high water permeability and poor corrosion resistance. In addition, the elongation of the resin layer cannot cover the occurrence of cracks in the galvanized layer at bends, etc., resulting in cracks in the resin layer, exposing metal parts and rusting, resulting in poor workability and corrosion resistance, especially on coastlines. When used in close quarters, even flat surfaces do not last more than 10 years, meaning they lack long-term durability.

In addition, thick-film resin-coated steel sheets coated with vinyl chloride resin use plasticizers that scatter over time, such as dioctyl phthalate, so the resin layer tends to deteriorate over time, and furthermore, when exposed to sunlight, a dehydrochlorination reaction occurs. Since the resin layer deteriorates when exposed to heat, it is necessary to use a thick film. In addition, since the water permeability is high, in order to compensate for this and improve processability, corrosion resistance, and weather resistance, the thickness must be 150 μm or more. Since the resin is flammable, its non-combustibility deteriorates, making it unusable as a non-combustible material if it is thicker than 100 μm.Furthermore, in the event of a fire, the vinyl chloride resin decomposes and generates toxic gas.

Furthermore, thick-film resin-coated steel sheets coated with polyolefin resin have excellent weather resistance, very low water permeability, and excellent corrosion resistance.Furthermore, the elongation rate of the resin layer itself is quite high, making it excellent in processability. When exposed to light, the resin layer deteriorates due to ultraviolet rays, and furthermore, the ultraviolet rays pass through the resin layer, degrading the adhesive layer provided between the steel plate and the polyolefin resin that has poor adhesion to the steel plate to ensure good adhesion. In order to prevent the transmission of this ultraviolet rays, coloring pigments are added, but if you try to add pigments without impairing productivity and physical properties, it is difficult to add large amounts of pigments. , the resin layer must be made thicker by 100 μm or more to capture this, and if the resin layer is made thicker in this way, the nonflammability of polyolefin resin will deteriorate due to the large amount of heat generated during combustion, and if the resin layer is thicker than 90 μm, the non-flammability will deteriorate. It will be difficult to pass the noncombustible material test stipulated in Ministry of Construction Notification No. 1828. Furthermore, there are two methods for producing steel sheets coated with polyolefin resin: one method is to extrude polyolefin resin containing color pigment onto a metal plate from an extrusion device, and the other is to make a film of polyolefin resin containing color pigment and laminate it on the metal plate. In both cases, the color of polyolefin resin becomes a surface decorative board. For this reason,
In the former method, the colors are matched using a color matching resin before operation, but this requires considerable skill and requires difficult work such as controlling the film thickness, which requires a considerable amount of preparation time before operation. If you change the color frequently, the operating rate will decrease. In addition, in the latter method, large rolls of polyolefin film manufactured by petrochemical manufacturers are purchased and laminated, so if the color is changed frequently, the polyolefin film must be replaced frequently. Difficult to respond to low-volume production of various types.

[Means to solve the problem]

This invention was made as a result of intensive research in view of the current situation, and it involves providing an adhesive modified polyolefin resin layer on the surface of a metal plate with or without a primer, and then interposing a polyolefin resin layer on top of the adhesive modified polyolefin resin layer. By providing a resin coating layer with or without intervening, it has sufficient nonflammability, corrosion resistance, weather resistance, and processability, and can also be fully adapted to high-mix, low-volume production. .

According to this invention, since the adhesive modified polyolefin resin layer and the polyolefin resin layer are provided on the surface of the metal plate with or without a primer, the adhesive modified polyolefin resin layer originally has poor adhesive properties. A polyolefin resin layer is formed on the surface of the metal plate with good adhesion.

Further, the corrosion resistance is improved by the presence of the primer, and since the adhesive modified polyolefin resin layer and the polyolefin resin layer have extremely low water permeability, the corrosion resistance is also sufficiently improved by these polyolefin resin layers.

Furthermore, since the adhesive modified polyolefin resin layer and the polyolefin resin layer have a considerably high elongation rate, the elongation of the resin layer can cover the occurrence of cranking in the galvanized layer. Workability is sufficiently improved without cracking, exposing metal parts, and rusting.

In addition, since a resin coating layer with a high pigment content is formed on the adhesive modified polyolefin resin layer and the polyolefin resin layer, it prevents the adhesive modified polyolefin resin layer and the polyolefin resin layer from deteriorating due to sunlight. As a result, the thicknesses of the adhesive modified polyolefin resin layer and the polyolefin resin layer can be reduced, so that the nonflammability can be sufficiently improved.

Furthermore, since a resin coating layer is provided on the top layer, a coating machine with a different color of paint can be used interchangeably when painting this resin coating layer, and by switching this coating machine, the resin-coated metal plate can be coated with a resin coating. It is possible to change the color tone in various ways, eliminating the need to change the color of the adhesive modified polyolefin resin layer and the polyolefin resin, making it possible to fully cope with small-lot, high-mix production, and improving the design of the color tone.

Embodiments of the resin-coated metal plate of the present invention will be described below with reference to FIGS. 1 to 3.

In Figures 1 to 3, 1 is a metal plate made of steel plate, stainless steel plate, copper plate, aluminum plate, etc.

A plating layer 2 is formed by plating the surface of the metal plate 1, and is coated with zinc plating, aluminum plating, aluminum-zinc alloy plating, or the like.

Reference numeral 3 denotes a chemically treated layer formed by chemically treating the surface of the plating layer 2. Usually, the chemical treatment includes zinc phosphate treatment, chromate treatment, or coated chromate treatment.

4 is a primer coated on the chemically treated layer;
If necessary, a rust preventive pigment such as strontzyme chromate or zinc chromate is added, mixed and dispersed with a resin and an organic solvent to prepare a paint, and this paint is applied onto the chemically treated layer and dried to form a coating. Epoxy resin is the most suitable resin to be used here, but polyester,
Acrylic resin, urethane resin, etc. are also used after being modified with epoxy. In addition, when adding rust-preventive pigments, the ratio of rust-preventive pigments to resin is determined by the film thickness of the primer, application, drying conditions, etc. If the film thickness is thin, the ratio of rust-preventive pigments is high; When the resin is thick, the ratio tends to be low, but it is used within the range of 5 to 30 parts by weight per 100 parts by weight of the resin.

When the primer 4 is formed to cover the metal plate 1 in this manner, rusting caused by scratches from the edges and surface layer of the metal plate 1 is effectively prevented by the primer 4, and corrosion resistance is improved. Primer 4, which has excellent corrosion prevention function,
It is not necessary to provide primer 4 in the case of interior materials, materials for utensils, etc. that do not require much corrosion resistance, but it is preferable to provide primer 4 when used in outdoor building materials, etc.
In this case, if the layer thickness of the primer 4 is less than 3 μm, there will be no long-term corrosion resistance, and if it is thicker than 15 μm, no increase in effectiveness can be expected and the cost will increase, so the layer thickness of the primer 4 should be within the range of 3 to 15 μm. is preferred.

Reference numeral 5 denotes an adhesive modified polyolefin resin layer coated on the primer 4, and this adhesive modified polyolefin resin layer 5 improves the adhesiveness of the polyolefin resin, which originally has poor adhesiveness.

Thus, it is coated on the primer 4 with good adhesion, and when the primer 4 is not provided, it is coated on the chemically treated layer 3 with good adhesion. Furthermore, if neither the chemical treatment layer 3 nor the plating layer 2 is provided, the surface of the metal plate 1 is coated with good adhesion as shown in FIG.

As the modified polyolefin resin used for this adhesive modified polyolefin resin layer 5, polyethylene resin, polypropylene resin, etc. modified with maleic acid, methacrylic acid, acrylic acid, phthalic acid, etc. are preferably used. For forming the coating in step 5, if necessary, pigments such as titanium oxide, iron oxide, red lead, etc. are mixed and dispersed in these resins, and this is extruded onto the primer 4 using an extrusion device and painted, or by adhesion of these pigments. This is carried out by forming a film made of a modified polyolefin resin in advance and laminating it on the primer 4. Further, if the primer 4 is not provided, a coating is formed on the chemically treated layer 3 in the same manner, and if the chemically treated layer 3 and the plating layer 2 are also not provided, the same is shown in FIG. A coating is formed on the surface of the metal plate 1 as shown in FIG.

The polyolefin resin layer 6 formed on the adhesive modified polyolefin resin layer 5 is made of polyethylene resin,
If necessary, a pigment such as titanium oxide, iron oxide, or red lead is mixed and dispersed in a polyolefin resin such as a polypropylene resin, and the mixture is extruded onto the adhesive modified polyolefin resin layer 5 from an extrusion device and painted. The coating is formed by forming a film made of a polyolefin resin in advance and laminating it on the adhesive modified polyolefin resin layer 5.

The polyolefin resin layer 6 formed in this way
Since it is made of the same polyolefin resin as the adhesive modified polyolefin resin layer 5, it is formed on the adhesive modified polyolefin resin layer 5 with good adhesion. In addition, when the total thickness of these adhesive modified polyolefin resin layer 5 and polyolefin resin layer 6 becomes thinner than 15 μm, the water permeability becomes high and long-term corrosion resistance cannot be expected.On the other hand, when the total thickness becomes too thick, the nonflammability deteriorates and the total thickness is 90μ
If the thickness exceeds m, it will not comply with the Ministry of Construction Notification No. 1828, so the total thickness of both of them should be within the range of 15 to 70 μm when converted to the thickness of only the resin excluding pigments etc. contained in them. It is preferable that there be. In this case, if nonflammable pigments such as titanium oxide, iron oxide, red lead, etc. are added to the adhesive modified polyolefin resin layer 5 and the polyolefin resin layer 6, the addition of these nonflammable pigments will deteriorate the nonflammability. Therefore, the total thickness of both of these may be increased by a weight commensurate with these nonflammable pigments. The total thickness excluding the pigments contained in both of them is calculated from the total weight it (g/rrr) to the weight of the nonflammable pigment (g/rrr).
/ rrr ) is subtracted from the total resin density (
It can be expressed as a clear film thickness equivalent value divided by (g/cffl). Of the total thickness of both, the thickness of the adhesive modified polyolefin resin layer 5 is set within the range of 8 to 15 μm in order to fully exhibit the adhesive property improvement effect of this adhesive modified polyolefin resin layer 5. is preferable.

Such adhesive modified polyolefin resin layer 5 and polyolefin resin layer 6 do not necessarily need to be formed by laminating these two layers, and as shown in FIG. The polyolefin resin layer 5 may be thickened, or the polyolefin resin layer 6 may be thickened by forming only the adhesive modified polyolefin resin layer 5.
The same effect can be obtained as when stacking. In addition, if these polyolefin resin layers 5, 6 are colored white with a coloring pigment, the color hiding property of the resin coating layer coated thereon can be improved.

7 is a resin coating layer formed on the polyolefin resin layer 6, and this resin coating layer 7 is made by dissolving a thermosetting polyester resin, silicone polyester resin, fluororesin, etc. in an appropriate solvent, and then dissolving the resin in a suitable solvent. A paint is prepared by mixing and dispersing various color pigments in the polyolefin resin layer 6.
Coat the metal plate with a roll coater etc. and set the temperature of the metal plate to 180℃.
A coating is formed by drying at a temperature of ~240°C. In addition, when the polyolefin resin layer 6 is not provided, a coating is formed on the adhesive modified polyolefin resin layer 5 in the same manner.

When the resin coating layer 7 is formed in this way, the thermosetting polyester resin, silicone polyester resin, fluororesin, etc. used for the resin coating layer 7 have excellent weather resistance, so the weather resistance is sufficient. will be improved. Also, resin coating layer 7
can contain a high proportion of colored pigments and can effectively prevent the transmission of ultraviolet rays from the sun.
The adverse effect of ultraviolet rays on the polyolefin resin layer 6 or the adhesive modified polyolefin resin layer 5 is effectively suppressed. As a result, the thickness of the polyolefin resin layer 6 and the adhesive modified polyolefin resin layer 5 can be reduced, and the nonflammability can be sufficiently improved. Furthermore, when forming the resin coating layer 7, the temperature of the metal plate is raised to 180 to 240"C as a drying condition for the baking of the paint. Reheating and curing after laminating
This baking of the paint can also be done by drying, and the manufacturing process can be simplified.

In addition, regarding the coating of this resin coating layer 7, the color of the resin-coated metal plate can be easily changed by installing coating machines with paints of different colors that can be exchanged, and by switching between these coating machines and painting. It can be varied in various ways and can be fully adapted to high-mix, low-volume production.

In order to exhibit the desired effect, such a resin coating layer 7 contains 30 to 100 parts of a colored pigment to 100 parts by weight of the resin.
It is preferable to include it in the resin coating layer 7 within the range of parts by weight, and if the thickness of the resin coating layer 7 is less than 5 μm, sufficient hiding property will not be obtained when black color is excluded. In addition, ultraviolet rays pass through and have a negative effect on polyolefin resin, and if the coating is thicker than 40 μm, the drying conditions will deteriorate, reducing the production efficiency of the line, and deterioration of the physical properties of the coating film is often observed, which simply increases the cost. The thickness is preferably within the range of 5 to 40 μm.

In addition, when forming the resin coating layer 7 on the polyolefin resin layer 6 or the adhesive modified polyolefin resin layer 5, it is difficult to apply the resin paint and dry it. It is preferable to subject the painted surface to a treatment such as a fire treatment or a corona discharge treatment. When such a fire treatment or a corona discharge treatment is applied, carbonyl groups are generated on the surface of the polyolefin resin layer 6 or the adhesive modified polyolefin resin layer 5. Adhesion with the resin coating layer 7 becomes even better.

〔Example] Next, embodiments of the invention will be described.

Example 1 Using the resin coating device shown in FIG. 4, the unwinding roll 8 was galvanized (fabric weight Z22) to a thickness of 0.5 mm.
The steel plate 1 was sent out and treated with zinc phosphate in the chemical treatment device 10 to form a chemically treated layer of 1 μm on the plating layer.

Next, an epoxy resin (manufactured by NOF Corporation,
P-32) was applied and dried at 190° C. using a drying device 12 to form a primer with a thickness of 5 μm on the chemically treated layer.

Next, from the supply roll 13, a white polyethylene film (Hitalex PE, manufactured by Hitachi Chemical Co., Ltd.) 14 consisting of an adhesive modified polyethylene resin layer with a thickness of 12 μm on the lower side and a polyethylene resin layer with a thickness of 38 μm on the upper side is guided. A pair of crimping rolls 17.1 via rolls 15 and 16
7 and laminated on the primer at the temperature of steel plate 1 of 190°C. Subsequently, flame treatment was performed for about 2 seconds using a flame treatment apparatus for one day to form an adhesive modified polyethylene resin layer and a polyethylene resin layer on the brimer.

Next, the coating devices 19a and 19b are replaceably provided.
A gray thermosetting polyester resin (manufactured by NOF Corporation, NO3750) was applied using 19a, and the baking process was dried using a drying device 20 at a temperature of 190°C to form a resin coating with a thickness of 15 μm. A membrane layer was formed on the polyethylene resin layer. After that, the first
As shown in the figure, a plating layer 2, a chemical treatment layer 3,
A resin-coated steel plate was prepared by sequentially laminating a primer 4, an adhesive modified polyethylene resin layer 5, a polyethylene resin layer 6, and a resin coating layer 7.

Example 2 Same as Example 1 except that epoxy resin (manufactured by Nippon Paint Co., Ltd., P-62) was used instead of epoxy resin (manufactured by Nippon Paint Co., Ltd., P-32) in forming the primer in Example 1. A primer with a thickness of 56t:'7 μm was formed, and in the formation of the resin coating layer, gray silicone polyester resin (NO3750, manufactured by Nihon Yushi Co., Ltd.) was used instead of gray thermosetting polyester resin (No. Using Nippon Paint Co., Ltd., S-30),
Baking was carried out in the same manner as in Example 1, except that the drying temperature was changed from 190°C to 210'C, to form a resin coating layer with a thickness of 20 μm.Furthermore, in the same manner as in Example 1, a chemically treated layer, A resin-coated steel plate was produced by forming an adhesive modified polyethylene resin layer and a polyethylene resin layer.

Example 3 In forming the resin coating layer in Example 1, a gray thermosetting polyester resin (manufactured by NOF Corporation, NO37) was used.
50), use a gray fluororesin (manufactured by NOF Corporation, N08000), and set the drying temperature to 190℃ for baking.
A resin coating layer with a thickness of 20 μm was formed in the same manner as in Example 1 except that the temperature was changed from °C to 240 °C, and a chemically treated layer, a primer, and an adhesive modified polyethylene resin were formed in the same manner as in Example 1. A resin-coated steel sheet was produced by forming a polyethylene resin layer and a polyethylene resin layer.

Example 4 In forming the adhesive modified polyethylene resin layer and the polyethylene resin layer in Example 1, the lower side had a thickness of 12 μm.
m adhesive modified polyethylene resin layer with a thickness of 38 m on the upper side.
Instead of a white polyethylene film (manufactured by Hitachi Chemical Co., Ltd., Hitalex PE) consisting of a 12 μm thick adhesive modified polyethylene resin layer on the lower side and a 58 μm thick polyethylene resin layer on the upper side. An adhesive modified polyethylene resin layer and a polyethylene resin layer were formed in the same manner as in Example 1, except that a polyethylene film (manufactured by Hitachi Chemical Co., Ltd., Hitalex PE) was used. Thermosetting polyester resin (manufactured by NOF Corporation, NO3750)
A resin coating layer with a thickness of 7 μm was formed in the same manner as in Example 1, except that a white thermosetting polyester resin (manufactured by NOF Corporation, N03800) was used instead of Then, a chemically treated layer, a primer-adhesive modified polyethylene resin layer, and a polyethylene resin layer were formed to produce a resin-coated steel sheet.

Example 5 In forming the adhesive modified polyethylene resin layer and the polyethylene resin layer in Example 2, the lower side had a thickness of 12 μm.
m adhesive modified polyethylene resin layer with a thickness of 38 m on the upper side.
Instead of the white polyethylene film (manufactured by Hitachi Chemical Co., Ltd., Hitalex PE) made of a 30 μm thick polyethylene resin layer, a white polyethylene film made of a 30 μm thick adhesive modified polyethylene resin layer (Bond First, made by Sumitomo Kagaku Co., Ltd.) An adhesive modified polyethylene resin layer was formed in the same manner as in Example 2, except that a gray silicone polyester resin (manufactured by Nippon Paint Co., Ltd., S-30) was used in place of the resin coating layer. , beige thermosetting polyester resin (manufactured by NOF Corporation, NO31
0), and the drying temperature for baking was 210°C to 19°C.
The thickness was 30°C in the same manner as in Example 2 except that the temperature was changed to 0°C.
A resin coating layer of μm thickness was formed, and a chemically treated layer and a primer were further formed in the same manner as in Example 2 to produce a resin-coated steel sheet.

Comparative Example 1 A chemical treatment layer, a primer, and a resin coating layer were formed in the same manner as in Example 1, except that the formation treatment of the adhesive modified polyethylene resin layer and the polyethylene resin layer was omitted, and the resin I made a coated steel plate.

Comparative Example 2 A chemically treated layer, a primer, and a resin coating layer were formed in the same manner as in Example 2, except that the processes for forming the adhesive modified polyethylene resin layer and the polyethylene resin layer were omitted, and the resin I made a coated steel plate.

Comparative Example 3 A chemically treated layer was formed on the surface of a galvanized steel sheet in the same manner as in Example 3, and then a fluororesin (fluorine primer manufactured by Nippon Oil & Fats Co., Ltd.) was applied on the chemically treated layer, and a 190°
The baking process was dried to form a primer with a thickness of 5 μm.

Next, on the primer, the thickness was 20 mm in the same manner as in Example 3.
A resin coating layer of μm thickness was formed to produce a resin-coated steel plate.

Comparative Example 4 A chemically treated layer was formed on the surface of a galvanized steel sheet in the same manner as in Example 1, and then an epoxy phenol resin (manufactured by Nippon Paint Co., Ltd., N01640) was coated on the chemically treated layer to a thickness of 8 μm. A primer was formed.

Next, a gray vinyl chloride resin (manufactured by Nippon Paint Co., Ltd., No. 1000 YK) was applied on the primer, baked and dried to form a resin coating layer with a thickness of 150 μm, and the resin-coated steel plate was coated. I made it.

Comparative Example 5 A chemically treated layer was formed on the surface of a galvanized steel sheet in the same manner as in Example 1, and then an epoxy resin (
P-32 (manufactured by Nihon Yushi Co., Ltd.) was applied, and baked and dried to form a primer with a thickness of 5 μm.

Next, a 150 μm thick gray polyethylene film (manufactured by Hitachi Chemical Co., Ltd., Hitalex) was laminated on the primer at a steel plate temperature of 190°C to produce a resin-coated steel plate.

The resin-coated steel sheets obtained in each Example and Comparative Example were tested for adhesion, workability, corrosion resistance, weather resistance, and nonflammability of the resin layer. The adhesion test of the resin layer is based on JIS, DO
The number of peels was measured based on the 202nd board test method, and the workability test was conducted to examine the occurrence of cranks when the bending angle was 180 degrees close bending and 180 degrees bending with a diameter of 2 mm. In addition, the weather resistance test was conducted using a Sunshine Weatherometer to measure the presence or absence of peeling of the resin layer from the steel plate after 2000 hours of irradiation, as well as the color difference.The corrosion resistance test was conducted based on JIS, Z2371, and was used to check for blisters, etc. Judgment was based on ASTM method. Furthermore, a nonflammability test was conducted based on Ministry of Construction Notification No. 1828, and pass or fail was determined.

Table 1 below shows the results.

〔Effect of the invention〕

As is clear from Table 1 above, the resin-coated steel sheets obtained in the present invention (Examples 1 to 5) have better adhesion of the resin layer than the resin-coated steel sheets obtained in Comparative Examples 1 to 5. The weather resistance is equivalent, the workability and corrosion resistance are good, and the nonflammability test was passed, so the resin-coated metal sheet obtained by this invention has excellent nonflammability, corrosion resistance, weatherability, and workability. I know that there is.

Further, according to the manufacturing method of the present invention, when painting the resin coating layer provided as the top layer, the color of the resin-coated metal plate can be easily changed by simply changing the coating machine, and the adhesive property There is no need to change the color of the modified polyolefin resin layer and the polyolefin resin layer, and it is possible to fully support high-mix, low-volume production.

[Brief explanation of the drawing]

FIG. 1 is a partially enlarged sectional view showing one embodiment of the resin-coated metal plate obtained by the present invention, and FIGS. 2 and 3 are partially enlarged sectional views showing other examples of the same resin-coated metal plate. FIG. 4 is a schematic explanation showing the manufacturing process of the resin-coated metal plate of the present invention. ■...Metal plate (steel plate), 4...Primer, 5...
- Adhesive modified polyolefin resin layer, 6... Polyolefin resin layer, 7... Resin coating layer Inventor Tetsuo Saito 1'j+'-1 Figure 1 1... Metal plate 4... Brimer 5.・-Adhesive modified polyolefin resin layer 6...Polyolefin resin layer 7...Resin coating layer Diagram]

Claims (1)

[Claims] 1. An adhesive modified polyolefin resin layer is provided on the surface of a metal plate with or without a primer, and a resin coating layer is further applied thereon with or without a polyolefin resin layer. A resin-coated metal plate 2 characterized in that the primer has a thickness of 0 to 15 μm, and the adhesive modified polyolefin resin layer or the total thickness of the adhesive modified polyolefin resin layer and the polyolefin resin layer is included in these. 15 when converted to the thickness of only the resin excluding pigments etc.
70 μm and the resin coating layer has a thickness of 5 to 40 μm, the resin-coated metal plate 3 according to claim 1, wherein an adhesive modified polyolefin resin layer is formed on the surface of the metal plate, or a primer is applied to the surface of the metal plate. After forming the primer, an adhesive modified polyolefin resin layer is formed on this primer, and then a resin coating layer is formed on these adhesive modified polyolefin resin layers, or a resin coating layer is formed on these adhesive modified polyolefin resin layers. A method for producing a resin-coated metal plate, which further comprises forming a polyolefin resin layer and then forming a resin coating layer on the polyolefin resin layer.