JP2011037130A - Adhesive resin composition-coated metal plate, and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive resin composition-coated metal plate excellent in adhesiveness and film removability, and also excellent in blocking resistance, and a method for manufacturing the same. <P>SOLUTION: This adhesive resin composition-coated metal plate is coated with an adhesive resin composition, by forming a film at a temperature lower than 150°C on a surface of a metal plate. The adhesive resin composition contains a thermoplastic alkali-soluble polymer compound and a blocked isocyanate type cross-linking agent, the thermoplastic alkali-soluble polymer compound has a fusion peak temperature of 50°C or higher but 150°C or lower, and the blocked isocyanate type cross-linking agent has a block dissociation temperature of 150°C or higher. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an adhesive resin composition-coated metal plate in which the surface of a metal plate is coated with an adhesive resin composition and a method for producing the same.

  For example, in industrial production such as automobile manufacturing processes, when joining metal plates with an adhesive, for example, the adhesive is uniformly applied to uneven surfaces, or the adhesive is uniformly and reliably filled in narrow areas. It is not easy to do. Therefore, a metal plate pre-applied with an adhesive has been proposed.

  For example, Patent Document 1 discloses an adhesive-coated metal material (metal plate) in which a metal base material is coated with a solid (B state) film of an epoxy-based adhesive. According to this technology, it does not have surface tackiness at room temperature, has a film adhesion that can withstand machining, and has a fluidity that can secure an adhesion area by simply heating. It has the characteristic that adhesive force expresses by.

  In Patent Document 2, adhesiveness and easy peeling are performed by applying a service coating to the back surface (adhesive surface) of an aqueous hot-melt type easy-to-release paint in which an aqueous resin emulsion and a release agent are blended with a tackifying resin. A pre-coated metal having both properties is disclosed. According to this technique, it can be rolled up or stored in a stack, has an adhesive force that is manifested only by heating, and has a function of easily peeling when irradiated with energy again.

  Further, Patent Document 3 discloses a film of an adhesive composition composed of a water-soluble saturated copolyester resin in a metal base material and a polyhydric alcohol compound selected from the group consisting of glycerin, sorbitol and polyvinyl alcohol. An adhesive-coated metal plate coated with is disclosed. According to this technique, adhesiveness is exhibited by heating, and unnecessary portions of the adhesive composition can be easily removed by washing or the like.

JP 2004-237556 A JP 2004-106252 A JP-A-8-218052

However, the conventional metal plate coated with the adhesive composition (adhesive resin composition-coated metal plate) has the following problems.
In the technique described in Patent Document 1, the reaction of the epoxy adhesive proceeds depending on the storage conditions and the B state cannot be maintained. There is a problem that cannot be secured.

  In addition, since the entire surface of the metal base material is covered with the pre-coated metal plate, it is preferable that a portion that does not require adhesion can be easily removed. However, since the film formed by the techniques described in Patent Document 1 and Patent Document 2 does not have solubility in an alkaline aqueous solution, it is an alkali that is widely used industrially, such as in an automobile manufacturing process, even before curing. There is a problem that unnecessary portions cannot be removed by cleaning or the like.

  On the other hand, the technique described in Patent Document 3 is excellent in the removal of unnecessary parts, but the adhesive resin composition is thermoplastic and does not have three-dimensional crosslinkability. There is a problem that it is difficult to expect adhesion.

  In addition, when the conventional adhesive resin composition-coated metal plates are stacked and stored, the metal plates adhere to each other (blocking), especially when the number of laminated layers is large, or in a high temperature environment such as the tropics and summer. There is. When such blocking occurs, it becomes difficult to take out the metal plates one by one at the time of use, workability is inferior, and the amount of the composition adhered becomes non-uniform due to peeling of the coating layer, and stable adhesive strength cannot be obtained. There is a problem.

  The present invention has been made in view of the above problems, and its purpose is to provide an adhesive resin composition-coated metal plate excellent in adhesiveness and film removal property and also in blocking resistance, and a method for producing the same. It is to provide.

  The adhesive resin composition-coated metal plate according to claim 1 (hereinafter, appropriately referred to as a coated metal plate) is coated on the surface of the metal plate by film formation at a temperature of less than 150 ° C. An adhesive resin composition-coated metal plate, wherein the adhesive resin composition comprises a thermoplastic alkali-soluble polymer compound (hereinafter referred to as a polymer compound as appropriate) and a block isocyanate type cross-linking agent (hereinafter referred to as appropriate). The thermoplastic alkali-soluble polymer compound has a melting peak temperature of 50 ° C. or higher and lower than 150 ° C., and the block isocyanate type cross-linking agent has a block dissociation temperature of 150 ° C. or higher. Features.

  According to such a coated metal plate, in use, the adhesive resin composition coating layer is melted by heating to 50 ° C. or higher and lower than 150 ° C., and is three-dimensionally cured by heating to 150 ° C. or higher. . Thereby, the adhesiveness in a covering metal plate expresses. In addition, the unnecessary portion of the adhesive resin composition coating layer is easily removed by alkali cleaning that is widely used in automobile manufacturing processes and the like (that is, excellent in film removal properties (alkali removal properties)). Furthermore, blocking resistance (stacking resistance) that can be stacked at room temperature is improved.

The adhesive resin composition-coated metal sheet according to claim 2, wherein the thermoplastic alkali-soluble polymer compound is a compound having in the molecule at least one selected from a carboxyl group, a hydroxyl group and an amide group. To do.
Further, in the adhesive resin composition-coated metal plate according to claim 3, the thermoplastic alkali-soluble polymer compound is composed of a polyamide resin, a polyether resin, a vinyl acetate resin, a polyester resin, an acrylic resin, and modified products thereof. It is at least one kind selected.
According to such a coated metal plate, alkali removability (film removal property) is further improved.

The adhesive resin composition-coated metal plate according to claim 4 is characterized in that the adhesive resin composition contains an inorganic filler having an average particle diameter of 10 μm or more and 200 μm or less.
According to such a coated metal plate, when the coated metal plates are bonded to each other, a certain amount of adhesive layer is formed between these coated metal plates, and the adhesiveness is further improved.

  The method for producing an adhesive resin composition-coated metal sheet according to claim 5 is the method for producing an adhesive resin composition-coated metal sheet as described above, wherein a paint in which the adhesive resin composition is dissolved in a solvent is used. A paint preparation step for preparing, a coating step for applying the paint to a metal plate, and a solvent removal step for removing the solvent by heating the metal plate to which the paint is applied to a temperature of less than 150 ° C. And

  According to such a production method, a coated metal plate having excellent adhesiveness, film removal property and blocking resistance is produced.

  The adhesive resin composition-coated metal plate according to the present invention has excellent adhesiveness in the use of the adhesive resin composition-coated metal plate. Moreover, since it is excellent in the film-removing property in alkali cleaning, an unnecessary portion in the adhesive resin composition coating layer can be easily removed. Furthermore, since it is excellent also in blocking resistance, the lamination | stacking storage at normal temperature is possible.

  According to the method for producing an adhesive resin composition-coated metal plate according to the present invention, an adhesive resin composition-coated metal plate excellent in adhesiveness, film removal property, and blocking resistance can be produced.

  Next, the adhesive resin composition-coated metal plate according to the present invention and the production method thereof will be described in detail.

≪Adhesive resin composition coated metal plate≫
The adhesive resin composition-coated metal plate (hereinafter, appropriately referred to as a coated metal plate) is obtained by coating the surface of a metal plate with an adhesive resin composition by film formation at a temperature of less than 150 ° C. The adhesive resin composition includes a thermoplastic alkali-soluble polymer compound (hereinafter, appropriately referred to as a polymer compound) and a blocked isocyanate type crosslinking agent (hereinafter, appropriately referred to as a crosslinking agent). The surface of the metal plate means one side or both sides of the metal plate.
Each configuration will be described below.

<Metal plate>
The type of metal plate to which the adhesive resin composition can be applied is not particularly limited, and is a hot-rolled steel plate, cold-rolled steel plate, plated steel plate, alloyed hot-dip galvanized steel plate, stainless steel plate, aluminum plate, aluminum alloy plate, copper plate. And titanium plates.

<Thermoplastic alkali-soluble polymer compound>
The polymer compound has a melting peak temperature of 50 ° C. or higher and lower than 150 ° C., and is a thermoplastic compound that starts melting and flowing at 50 ° C. or higher and lower than 150 ° C.
When the melting peak temperature of the polymer compound is less than 50 ° C., when the coated metal plates are stored in the form of a coil or laminated, especially when stored in the summer or the tropics, adhesion between the coated metal plates (so-called blocking phenomenon) May occur (that is, the blocking resistance is reduced). On the other hand, at 150 ° C. or higher, it is necessary to increase the heating temperature in order to ensure film formability during the production of the coated metal plate, and the block dissociation temperature of the crosslinking agent is 150 ° C. or higher as described later. Therefore, the reaction of the cross-linking agent tends to occur and the stability is lowered. That is, since a crosslinking agent becomes easy to react, when using a coated metal plate, when the coated metal plate is heated and joined, the melt fluidity of the adhesive resin composition is impaired. Therefore, the melting peak temperature of the polymer compound is 50 ° C. or higher and lower than 150 ° C. In addition, it becomes what was excellent in film removal property (alkali removal property) because a high molecular compound is alkali-soluble.

  Moreover, it is preferable that a high molecular compound is a compound which has at least 1 type chosen from a carboxyl group, a hydroxyl group, and an amide group in a molecule | numerator. Specific examples include polyamide resins, polyether resins, vinyl acetate resins, polyester resins, acrylic resins and modified products thereof (for example, carboxy modified products of acrylic resins, modified alkylene oxide products, saponified products, etc.). At least one selected from can be used. By using these substances as the polymer compound, the alkali removability (film removal property) becomes more excellent.

<Block isocyanate type cross-linking agent>
The crosslinking agent needs to be activated at a block dissociation temperature of 150 ° C. or higher, that is, 150 ° C. or higher.
As will be described later, in forming the adhesive resin composition coating layer, a coating material in which these constituent components are dissolved in a solvent is applied on a metal plate, heated at a temperature of less than 150 ° C., and then dried. An adhesive resin composition coating layer is formed. For this reason, it is necessary to apply a crosslinking agent that dissociates and activates at 150 ° C. or higher so that the reaction of the crosslinking agent is not initiated by heating during solvent removal. If the block dissociation temperature is less than 150 ° C., the crosslinking reaction may be initiated by heating during the production of the coated metal plate. As a result, three-dimensional crosslinking has already occurred at the time of film formation, and the heat meltability (melt fluidity) As a result, the adhesiveness is lowered in the use of the coated metal plate. Moreover, film removal property falls because an adhesive resin composition is insolubilized by a crosslinking reaction. Therefore, the block dissociation temperature of the crosslinking agent is set to 150 ° C. or higher. From this, the adhesive resin composition-coated metal plate coats the surface of the metal plate with the adhesive resin composition by film formation at a temperature of less than 150 ° C. As the block isocyanate type cross-linking agent, for example, Elastron (registered trademark) manufactured by Daiichi Kogyo Seiyaku Co., Ltd. can be used.

Moreover, it is preferable that an adhesive resin composition contains the inorganic filler whose average particle diameter is 10 micrometers or more and 200 micrometers or less.
If the adhesive resin composition contains an inorganic filler, the distance between the metal plates is less than the particle size of the inorganic filler when the coated metal plates are bonded by thermocompression bonding. A certain amount of the adhesive layer is held on the surface. When the average particle size is less than 10 μm, the effect of adding the inorganic filler is small. On the other hand, when it exceeds 200 μm, the particle size of the inorganic filler is too large, so that the adhesiveness is lowered. Therefore, when an inorganic filler is contained, the average particle size needs to be 10 μm or more and 200 μm or less. In addition, the thickness of the adhesive resin composition coating layer is preferably about 15 to 250 μm from the viewpoints of ensuring adhesiveness, paintability, and economy, but the average particle size of the inorganic filler is the adhesive resin composition. The thickness is preferably equal to or less than the thickness of the coating layer.

  The method for measuring the average particle size of the inorganic filler is not particularly limited, and can be measured by a known method such as a laser diffraction particle size distribution measuring apparatus. For example, the average particle diameter can be measured using an LS13 320 type laser scattering diffractometer (manufactured by Beckman Coulter, Inc.).

An example of the specific measurement method will be described below.
First, an appropriate amount of an object to be measured is taken into a 100 cc beaker, about 30 cc of solvent is added and stirred well, and the mixture is subjected to a homogenizer (output: about 200 W) for about 1 minute to disperse the powder. The solvent is water or 0.2% ammonia water. And this sample is immediately put into the small capacity module, the pump speed of the small capacity module is set to 50% (20 L / min at 100%), and the volume statistics from 0.04 to 2000 μm in particle size are measured, The average particle size is calculated by measuring the D90 value.

  As the inorganic filler, an inorganic filler selected from fused silica, titanium oxide, aluminum hydroxide, magnesium hydroxide, glass beads, glass flakes, talc, mica, synthetic mica, sepiolite, smectite, etc., alone or in combination Can be used. In addition, in order to improve adhesiveness with a high molecular compound or a crosslinking agent, what processed the surface by the silane coupling agent etc. may be applied for an inorganic filler.

≪Method for producing adhesive resin composition-coated metal sheet≫
The manufacturing method of the adhesive resin composition-coated metal plate is a manufacturing method of the above-described adhesive resin composition-coated metal plate, and includes a paint preparation step, an application step, and a solvent removal step.
Hereinafter, each step will be described.

<Paint preparation process>
The paint blending step is a step of blending a paint in which the adhesive resin composition is dissolved in a solvent.
The method for preparing the paint is not particularly limited, and may be a conventionally known method. For example, the paint can be prepared by dissolving and dispersing the adhesive resin composition in water or an organic solvent such as ethanol, xylene, or toluene. The above-mentioned paint may be used in combination with various aqueous solvents and paint additives for the purpose of improving the paintability and workability as long as the performance of the present invention is not impaired. Various additives such as activators, surface conditioners, wetting and dispersing agents, antisettling agents, antioxidants, antifoaming agents, rust preventives, antibacterial agents, and antifungal agents can be applied alone or in combination. it can.

<Application process>
The application step is a step of applying the paint to the metal plate.
The coating method of the coating on the metal plate is not particularly limited, but from the viewpoint of productivity, a roll coater, a curtain coater, etc. are applied to the coiled metal plate to continuously degrease. It is preferable to perform painting, heating, winding or cutting.

  Further, the lower limit of the adhesion amount of the adhesive resin composition is not particularly limited, but in order to stably develop the adhesive strength, the gap between the coated metal plates is bonded to the adhesive resin composition during bonding. It is necessary to fill and melt the material. Therefore, it is preferable to secure a volume of the adhesive resin composition of a certain amount or more. From this viewpoint, the amount of adhesion to the metal plate is preferably 15 μm or more per side, more preferably 20 μm or more. And The upper limit is not particularly limited, and may be determined in consideration of the cost and productivity of the adhesive resin composition itself. Regarding productivity, more specifically, in order to economically manufacture a coated metal plate, a method of continuously coating a metal strip by a roll coating method, a curtain coating method, or the like is preferable. You may decide in consideration of. However, in general, when the thickness exceeds 250 μm, obstacles in economy and production become large, and therefore, it is preferable to set the thickness to 250 μm or less.

<Solvent removal step>
A solvent removal process is a process of heating the metal plate which apply | coated the said coating material to the temperature below 150 degreeC, and removing a solvent. Thereby, the coated metal plate in which the adhesive resin composition coating layer is formed on the surface of the metal plate is obtained.
The method for removing the solvent is not particularly limited, and may be performed by a conventionally known method. For example, it can be performed using a hot air drying furnace. When the heating temperature for removing the solvent is 150 ° C. or higher, the crosslinking reaction may start. As a result, three-dimensional crosslinking has already occurred at the time of film formation, and the heat melting property (melt fluidity) is impaired. In the use of a metal plate, the adhesiveness decreases. Moreover, film removal property falls because an adhesive resin composition is insolubilized by a crosslinking reaction. Therefore, the heating temperature is less than 150 ° C.

  In carrying out the present invention, for example, a metal plate degreasing step for degreasing a metal plate or a base treatment for applying a base treatment to the metal plate before or after each step within a range that does not adversely affect each step. Other processes such as a process and an unnecessary object removing process for removing unnecessary substances such as dust may be included.

  The coated metal plates of the present invention thus produced do not adhere to each other even when the coated metal plates are laminated (excellent blocking resistance). Further, when used, it is bonded by thermocompression bonding at a temperature not lower than the melting peak temperature of the polymer compound and lower than 150 ° C., and further heated to 150 ° C. or higher. Thereby, a crosslinking agent acts, three-dimensional crosslinking (three-dimensional hardening) arises, and adhesiveness expresses by thermosetting. Further, the unnecessary portion of the adhesive resin composition coating layer is easily removed by alkali cleaning.

  Next, the adhesive resin composition-coated metal plate according to the present invention and the manufacturing method thereof will be specifically described by comparing an example that satisfies the requirements of the present invention with a comparative example that does not satisfy the requirements of the present invention.

<Sample preparation method>
The metal plate to be applied was prepared by the following method.
Pure aluminum-based 1100 aluminum plate, 5052 aluminum alloy plate, 6022 aluminum alloy plate, and cold-rolled steel plate were produced by a conventionally known production method. First, an ingot of aluminum and aluminum alloy having a composition of 1100, 5052, 6022, and a steel ingot having a predetermined composition is manufactured, and the ingot is subjected to a homogenization heat treatment, followed by hot rolling, followed by annealing treatment. After the cold rolling treatment, an aluminum plate, an aluminum alloy plate, and a cold-rolled steel plate having a thickness of 1.0 mm were manufactured. These were degreased using an alkaline agent (Surf Cleaner (registered trademark) 370 manufactured by Nippon Paint Co., Ltd.), and then subjected to phosphoric acid chromate treatment on the plate. In addition, the target value of this phosphoric acid chromate treatment adhesion amount was 10 mg / m ^{2 in} terms of Cr.

The adhesive resin composition coating layer was formed by the following method.
Using the polymer compound of substance No. listed in Table 1, a crosslinking agent, and an inorganic filler, the mixture was adjusted at the blending ratio shown in Table 2 to obtain a paint of an adhesive resin composition. Next, the coating material was applied to one side of the aluminum plate or the like with the test piece No. 1 in Table 3. 16 is 60 μm, test piece No. No. 17 was coated to a thickness of 200 μm, otherwise 30 μm, and then dried by heating at 110 ° C. to obtain an adhesive resin composition-coated metal plate. In addition, all of these paints were applied using a bar coater, and the coating material was a hot air drying furnace. Nos. 25 and 26 were heated to a maximum temperature of 160 ° C., and other than that, the maximum temperature of 120 ° C. was heated (described as film formation temperature in Table 3), and the solvent was removed. The heating temperature was confirmed with a heat seal tape. The amount of adhesion was measured with an eddy current film thickness meter (ISOSCOPE MP0 type manufactured by Fischer Instruments).

(Measurement of melting peak temperature and melting point)
The melting peak temperature / melting point of the polymer compound was measured by the following method.
Using a differential scanning calorimeter (DSC7 model, manufactured by Perkin Elmer), about 10 mg of the adhesive resin composition was sampled and JIS K7121 was used as the melting peak temperature of the DSC curve under the condition of a heating rate of 10 ° C./min. The melting peak temperature specified in (1) was measured. In addition, among those in which the melting peak temperature by the DSC curve is not clearly observed, the behavior in a high temperature environment was observed with a trace melting point measuring apparatus (MP500P type manufactured by Yanagimoto Seisakusho). In the observation method, a specimen sandwiched between two glass slides is placed on a heating stage, heated at about 10 ° C./min to determine whether the specimen flows and flows, and the melting start temperature is determined. Recorded. In Table 1, the substance No. The melting start temperature of 125 ° C. in the modified polyester resin of A-4 satisfies the melting peak temperature of 50 ° C. or more and less than 150 ° C.

(Measurement of average particle size of inorganic filler)
The average particle size of the inorganic filler was measured by the following method.
First, an appropriate amount of an object to be measured was taken in a 100 cc beaker, about 30 cc of solvent was added and stirred well, and the mixture was subjected to a homogenizer (output: about 200 W) for about 1 minute to disperse the powder. The solvent used was 0.2% aqueous ammonia. And this sample is immediately put into the small capacity module, the pump speed of the small capacity module is set to 50% (20 L / min at 100%), and the volume statistics from 0.04 to 2000 μm in particle size are measured, The average particle size was calculated by measuring the D90 value.

  The substances used are shown in Table 1, and the blended paints are shown in Table 2. In Tables 1 and 2, those that do not satisfy the scope of the present invention are indicated by underlining the substance names.

<Test material evaluation method>
About the adhesive resin composition coating | coated metal plate made as an experiment, various performances were evaluated with the following method.

(Adhesiveness)
Adhesiveness was evaluated by adhesive strength.
The adhesive resin composition-coated metal plate was cut into strips having a width of 30 mm and a length of 100 mm. Next, the coated surfaces of the two strip-shaped test pieces are overlapped with each other by 30 mm and bonded with a small vise. After being fixed and heated for 20 minutes at 170 ° C., they are cooled, and the test piece is cooled. Obtained. The adhesive strength of this test piece was evaluated by carrying out a tensile shear test at a tensile speed of 50 mm / min using an universal tester model 5582 manufactured by Instron. Those having an adhesive strength of 5 kN or more were judged good, and those having an adhesive strength of less than 5 kN were judged as bad.

(Film removal)
Prepare a test piece (100 mm wide x 100 mm long x 1 mm thick) of an adhesive resin composition-coated metal plate, and pH 11 to 12 alkaline cleaning solution (surf cleaner manufactured by Nippon Paint Co., Ltd.) (Registered trademark) EC90) was immersed for 2 minutes, and the film removal property was visually evaluated. As the film-removal evaluation criteria, those in which the film was completely dissolved were evaluated as very good (◎), those in which the film was all peeled off were evaluated as good (◯), and those in which all the film remained were evaluated as poor (x).

(Blocking resistance (stack resistance))
A small test press (manufactured by Yasuda Seiki Seisakusyo Co., Ltd.) prepared by preparing two test pieces (100 mm wide x 100 mm long x 1 mm thick) of an adhesive resin composition-coated metal plate, with the painted surfaces overlapped and held at 40 ° C. A 1 MPa load was applied for 24 hours. After a predetermined time has elapsed, the load is released, and after cooling to room temperature, if only the upper one of the two stacked test pieces is lifted, the lower plate is good (○). If they were bonded together and lifted together, it was judged as defective (x).
These results are shown in Table 3. In Table 3, those not satisfying the scope of the present invention are indicated by underlining the numerical values.

  As shown in Table 3, test piece No. Since Nos. 1 to 19 satisfy the configuration of the present invention, all of adhesiveness, film-removing property, and blocking resistance were very good or good.

On the other hand, test piece No. which is a comparative example. Since 20 to 26 did not satisfy the configuration of the present invention, the following results were obtained.
Specimen No. No. 20 was inferior in film removal property because the type of polymer compound was not a thermoplastic alkali-soluble polymer compound within the scope of the present invention.
Specimen No. No. 21 was inferior in film removal property because the type of the polymer compound was not a thermoplastic alkali-soluble polymer compound within the scope of the present invention. Moreover, since the melting peak temperature of the polymer compound was less than the lower limit, the blocking resistance was poor. Furthermore, since no cross-linking agent was added, the cross-linking reaction did not occur and the adhesiveness was poor. In addition, since paraffin wax is used as the polymer compound, bonding is possible if it is pressure-bonded in a heated and melted state, but since the molecular weight is small, the adhesive strength is low.
Specimen No. In No. 22, since the block dissociation temperature of the crosslinking agent was less than the lower limit value, the crosslinking reaction occurred due to the heat during film formation, and the thermoplasticity was lost. Moreover, since the adhesive resin composition was insolubilized by this crosslinking reaction, the film removal property was inferior.

Specimen No. Since No. 23 was not a blocked isocyanate type cross-linking agent, the type of cross-linking agent did not exhibit adhesiveness and could not be joined. Moreover, since the adhesive resin composition was insolubilized during film formation, the film removal property was inferior.
Specimen No. No. 24 was inferior in adhesiveness because the average particle size of the filler exceeded the upper limit.
Specimen No. In No. 25, since the film formation temperature exceeded the upper limit value, the crosslinking reaction occurred due to the heat during film formation, and the thermoplasticity was lost. Moreover, since the cross-linking reaction occurred due to the heat during film formation and the adhesive resin composition was insolubilized, the film removal property was inferior.
Specimen No. Since No. 26 is not a thermoplastic alkali-soluble polymer compound within the scope of the present invention, the film removal property was inferior. Moreover, since the melting peak temperature of the polymer compound exceeds the upper limit, there has been a problem that the film forming temperature has to be high. Furthermore, since no cross-linking agent was added, the cross-linking reaction did not occur and the adhesiveness was poor. In addition, since the modified polypropylene resin is used as the polymer compound, bonding can be performed by pressure bonding in a heated and melted state, but the adhesive strength is low because the molecular weight is small.

  As described above, the adhesive resin composition-coated metal plate and the method for producing the same according to the present invention have been described in detail with reference to the embodiments and examples, but the gist of the present invention is not limited to the above-described contents. Needless to say, the contents of the present invention can be widely modified and changed based on the above description.

Claims (5)

An adhesive resin composition-coated metal plate in which the adhesive resin composition is coated on the surface of the metal plate by film formation at a temperature of less than 150 ° C.,
The adhesive resin composition includes a thermoplastic alkali-soluble polymer compound and a blocked isocyanate type crosslinking agent,
The thermoplastic alkali-soluble polymer compound has a melting peak temperature of 50 ° C. or higher and lower than 150 ° C.,
The block isocyanate-type crosslinking agent has a block dissociation temperature of 150 ° C. or higher, and is an adhesive resin composition-coated metal plate.   The adhesive resin composition-coated metal sheet according to claim 1, wherein the thermoplastic alkali-soluble polymer compound is a compound having in the molecule thereof at least one selected from a carboxyl group, a hydroxyl group, and an amide group. .   3. The thermoplastic alkali-soluble polymer compound according to claim 2, wherein the thermoplastic alkali-soluble polymer compound is at least one selected from a polyamide resin, a polyether resin, a vinyl acetate resin, a polyester resin, an acrylic resin, and a modified product thereof. Adhesive resin composition-coated metal plate.   4. The adhesive resin composition-coated metal according to claim 1, wherein the adhesive resin composition contains an inorganic filler having an average particle diameter of 10 μm to 200 μm. Board. A method for producing an adhesive resin composition-coated metal plate according to any one of claims 1 to 4,
A paint preparation step of preparing a paint in which the adhesive resin composition is dissolved in a solvent; and an application step of applying the paint to a metal plate;
And a solvent removing step of removing the solvent by heating the metal plate to which the paint is applied to a temperature of less than 150 ° C., and a method for producing the adhesive resin composition-coated metal plate.