JP2001054935A - Metal plate coated with thermoplastic resin and it production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration of the good properties of a thermoplastic substance and to add another function to the substance by forming a coating layer containing a thermoplastic resin as a main component on the surface of a metal plate and forming the functional surface layer of a substance whose properties are different from those of the thermoplastic resin in the shape of a spot pattern on the surface of the coating layer. SOLUTION: A coating layer 2 of a thermoplastic resin is formed on the surface of a metal plate 1, a functional part 3 is embedded in the layer 2, and formation is done with its part dispersed/exposed on/from a surface in the shape of dots. A thermoplastic resin such as a vinyl fluoride resin which forms the layer 2 is applied on the plate 1 as the coating film or film of a coating using water, an organic solvent, etc., as a medium. A functional part 3 of antibacterial properties, mildewproofing properties, stain resistance, non-adhesion, mold releasing properties, processability, lubricity, abrasion resistance, antistatic properties, etc., is preferably dispersed in the shape of spots 0.5-15 mm in diameter and 10-90% in surface coating percentage in the layer 2.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、内装用建材、家電
製品、食品並びにその他の容器および加熱調理器具等の
幅広い用途に供される、熱可塑性樹脂を主成分とする被
覆層を有する金属板、特に該被覆層上に熱可塑性樹脂と
は物性の異なる物質を斑点状に形成して種々の機能を追
加形成した金属板およびその製造方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal plate having a coating layer containing a thermoplastic resin as a main component, which is used for a wide range of applications such as interior building materials, home electric appliances, foods, other containers and cooking utensils. More particularly, the present invention relates to a metal plate in which a substance having a property different from that of a thermoplastic resin is formed in a spot shape on the coating layer to add various functions, and a method for producing the same.

【０００２】[0002]

【従来の技術】一般に、ふっ素樹脂に代表される熱可塑
性樹脂の塗膜やフィルムで表面を被覆した金属板は、そ
の熱可塑性樹脂が持つ様々な優れた性質を活かし、前記
したような幅広い用途に供されている。近年、ニーズの
多様化に伴い、特定の熱可塑性樹脂に対し、この樹脂に
は望めない機能を付与することが検討されている。例え
ば、衛生面から抗菌および防かび性が付与されたポリエ
チレン樹脂やふっ素樹脂などが、検討されている。ま
た、熱可塑性樹脂には、例えばふっ素樹脂のように、柔
らかくて傷付き易くかつ静電気を帯び易い、というよう
な、使用目的によっては欠点となる性質を有する場合が
あるが、これに対して硬くて傷付きにくい性質の付与が
求められる場合がある。2. Description of the Related Art In general, a metal plate whose surface is coated with a coating film or a film of a thermoplastic resin represented by a fluororesin makes use of various excellent properties of the thermoplastic resin and is used in a wide range of applications as described above. Has been offered to. In recent years, along with diversification of needs, it has been studied to provide a specific thermoplastic resin with an undesired function. For example, polyethylene resins and fluororesins to which antibacterial and fungicidal properties are imparted from the viewpoint of hygiene have been studied. In addition, thermoplastic resins, such as, for example, fluororesins, are soft, easily damaged and easily charged with static electricity, and may have disadvantageous properties depending on the purpose of use. In some cases, it is required to impart a property that is hard to be damaged.

【０００３】従来、被覆層に対し、この層を構成してい
る熱可塑性樹脂と異なる特性 (機能) を付与する手法と
しては、熱可塑性樹脂の塗料やフィルム中に機能性物質
を含有させる方法が主流である。例えば、特開平１０−
１５６２８１号公報には、ポリエーテルサルフォン樹脂
に抗菌剤を含有させた抗菌性耐熱塗装鋼板を提案してお
り、このような鋼板を加熱調理器具等の耐熱構成材とし
て使用することが提案されている。また、特開平１０−
２９８３０８号公報には、銀系の無機抗菌剤を含有させ
た抗菌性ふっ素樹脂フィルムについて、このようなフィ
ルムを金属板にラミネートし、レンジフードやキッチン
壁パネル等の抗菌材料として使用することが提案されて
いる。Conventionally, as a method for imparting a property (function) different from that of the thermoplastic resin constituting the coating layer to the coating layer, a method of incorporating a functional substance into a coating or film of the thermoplastic resin has been known. Mainstream. For example, JP-A-10-
No. 156281 proposes an antibacterial heat-resistant coated steel sheet in which an antibacterial agent is added to polyethersulfone resin, and it has been proposed to use such a steel sheet as a heat-resistant component of a heating cooker or the like. I have. In addition, Japanese Patent Application Laid-Open
Japanese Patent Publication No. 298308 proposes that an antibacterial fluororesin film containing a silver-based inorganic antibacterial agent is laminated on a metal plate and used as an antibacterial material for a range hood, a kitchen wall panel and the like. Have been.

【０００４】前記した技術は、単に熱可塑性樹脂の塗料
やフィルムに抗菌剤を練り込んだだけであるから、表面
に露出する抗菌剤が少なく抗菌性が不十分となるため、
抗菌剤を熱可塑性樹脂表面に露出させるために、熱可塑
性樹脂の粒子表面を抗菌性金属で被覆したり、無機化合
物を混合添加したりしている。[0004] In the above-mentioned technique, an antibacterial agent is simply kneaded into a paint or a film of a thermoplastic resin.
In order to expose the antibacterial agent to the surface of the thermoplastic resin, the surface of the thermoplastic resin particles is coated with an antibacterial metal, or an inorganic compound is mixed and added.

【０００５】この方法によって、熱可塑性樹脂の表面
は、抗菌剤がほぼ均一に露出した形態となるが、一方で
熱可塑性樹脂が持つ耐候性、加工性、非粘着性等の性能
が低下する、という欠点があった。また、熱可塑性樹脂
フィルムに、抗菌剤を添加する場合、例えば、ふっ素樹
脂では、ペレットを溶融してフィルム化する際に、ペレ
ットと混合された抗菌剤が、最高で約４５０℃という高
温下で、腐食性の強いふっ化ガスを含む雰囲気に晒され
るため、変色したり、抗菌性能が損なわれるという問題
があった。According to this method, the surface of the thermoplastic resin has a form in which the antibacterial agent is almost uniformly exposed, but on the other hand, the performance of the thermoplastic resin such as weather resistance, workability, and non-adhesion is reduced. There was a disadvantage. In addition, when adding an antimicrobial agent to a thermoplastic resin film, for example, in the case of a fluororesin, when the pellets are melted and formed into a film, the antimicrobial agent mixed with the pellets is heated at a high temperature of about 450 ° C. at the maximum. In addition, since it is exposed to an atmosphere containing a highly corrosive fluoride gas, there is a problem that the color is changed and the antibacterial performance is impaired.

【０００６】また、熱可塑性樹脂の中で最も代表的であ
るふっ素樹脂は、その優れた耐候性、加工性、非粘着性
等から、金属板に被覆して使用されることが多い。しか
し、ふっ素樹脂は柔らかくて傷付き易く、また帯電し易
いので、使用目的によっては欠点となることもある。そ
こで、これらの欠点を改善するために、ガラス粉末、二
硫化モリブデン、グラファイト、アスベストまたは金属
粉末等の無機充填材をふっ素樹脂に混合する技術が提案
されている。これらの充填材を樹脂分に対して、５〜３
０％含有させることによって、ふっ素樹脂の耐磨耗性、
硬さ、非帯電性を向上させ得るが、抗菌剤の場合と同様
に、ふっ素樹脂フィルムが持つ耐侯性、加工性、非粘着
性等の性能が低下するという問題があった。[0006] The most typical fluororesin among thermoplastic resins is often used by coating it on a metal plate because of its excellent weather resistance, workability, and non-adhesiveness. However, fluororesin is soft, easily damaged, and easily charged, and may be disadvantageous depending on the purpose of use. Therefore, in order to improve these disadvantages, a technique has been proposed in which an inorganic filler such as glass powder, molybdenum disulfide, graphite, asbestos, or metal powder is mixed with a fluororesin. These fillers are used in an amount of 5 to 3 with respect to the resin content.
By containing 0%, the abrasion resistance of the fluororesin,
Although the hardness and the non-charging property can be improved, there is a problem that the performance of the fluororesin film, such as weather resistance, workability, and non-adhesion, is reduced as in the case of the antibacterial agent.

【０００７】本発明の目的は、従来技術が抱える上記問
題を解決することにあり、特に、熱可塑性樹脂が持つ様
々な優れた性質を低下させることなく、その熱可塑性樹
脂とは異なる機能を追加形成することによって、単に熱
可塑性樹脂を被覆した金属板では得られない機能を付加
するか、あるいはその金属板の欠点を改善した、金属板
を提供することにある。An object of the present invention is to solve the above-mentioned problems of the prior art, and in particular, to add a function different from the thermoplastic resin without deteriorating various excellent properties of the thermoplastic resin. An object of the present invention is to provide a metal plate which is formed by adding a function which cannot be obtained only by a metal plate coated with a thermoplastic resin, or in which the disadvantages of the metal plate are improved.

【０００８】[0008]

【課題を解決するための手段】本発明の要旨構成は、次
のとおりである。 （１）金属板の表面に、熱可塑性樹脂を主成分とする被
覆層を有し、該被覆層の表面に、前記熱可塑性樹脂とは
物性の異なる物質からなる機能化表層を斑点模様状に形
成してなることを特徴とする熱可塑性樹脂被覆金属板。The gist of the present invention is as follows. (1) A coating layer mainly composed of a thermoplastic resin is provided on the surface of a metal plate, and a functionalized surface layer made of a substance having a different physical property from that of the thermoplastic resin is formed on the surface of the coating layer in a spot pattern. A thermoplastic resin-coated metal plate characterized by being formed.

【０００９】（２）上記（１）において、被覆層が塗膜
またはフィルムであることを特徴とする熱可塑性樹脂被
覆金属板。(2) The thermoplastic resin-coated metal sheet according to (1), wherein the coating layer is a coating film or a film.

【００１０】(３) 上記 (１) において、斑点模様を呈
する上記機能化表層は、径が０．５〜１５ｍｍの大きさ
の、熱可塑性樹脂とは異なる物性を示す物質を、表面被
覆率１０〜９０％にて点状に分散したものからなること
を特徴とする熱可塑性樹脂被覆金属板。(3) In the above (1), the functionalized surface layer exhibiting a speckled pattern is made of a material having a diameter of 0.5 to 15 mm and having physical properties different from that of a thermoplastic resin, having a surface coverage of 10%. A thermoplastic resin-coated metal plate, which is composed of those dispersed in the form of dots at 90% or less.

【００１１】（４）熱可塑性樹脂を主成分とする被覆層
を有する、金属板の表面に、上記熱可塑性樹脂とは物性
の異なる液状物を、径：０．５〜１５ｍｍおよび表面被
覆率：１０〜９０％にて点状に塗布したのち、金属板を
熱可塑性樹脂の融点以上もしくは軟化点以上、かつ熱分
解温度以下で加熱することを特徴とする熱可塑性樹脂被
覆金属板の製造方法。(4) On the surface of a metal plate having a coating layer mainly composed of a thermoplastic resin, a liquid material having different physical properties from the above-mentioned thermoplastic resin is coated with a liquid having a diameter of 0.5 to 15 mm and a surface coverage of: A method for producing a thermoplastic resin-coated metal sheet, comprising applying a dot at 10 to 90% and heating the metal sheet at a temperature equal to or higher than the melting point or softening point of the thermoplastic resin and equal to or lower than the thermal decomposition temperature.

【００１２】（５）上記（４）において、金属板の加熱
に引き続き、熱可塑性樹脂の融点以上もしくは軟化点以
上の温度のうちに、冷却機能を有するロールで圧下し、
その後金属板の温度を熱可塑性樹脂の融点未満もしくは
軟化点未満に制御することを特徴とする熱可塑性樹脂被
覆金属板の製造方法。(5) In the above (4), following the heating of the metal plate, the thermoplastic resin is rolled down by a roll having a cooling function at a temperature equal to or higher than the melting point or the softening point of the thermoplastic resin.
Thereafter, the temperature of the metal plate is controlled to be lower than the melting point or lower than the softening point of the thermoplastic resin.

【００１３】（６）上記（４）または（５）において、
乾燥固化した塗膜の状態にある被覆層に液状物を塗布す
ることを特徴とする熱可塑性樹脂被覆金属板の製造方
法。(6) In the above (4) or (5),
A method for producing a thermoplastic resin-coated metal sheet, comprising applying a liquid material to a coating layer in a state of a dried and solidified coating film.

【００１４】（７）上記（４）または（５）において、
未乾燥の液状塗膜の状態にある被覆層に液状物を塗布す
ることを特徴とする熱可塑性樹脂被覆金属板の製造方
法。(7) In the above (4) or (5),
A method for producing a thermoplastic resin-coated metal sheet, comprising applying a liquid material to a coating layer in a state of an undried liquid coating film.

【００１５】[0015]

【発明の実施の形態】次に、本発明の熱可塑性樹脂被覆
金属板について、図１を参照して説明する。すなわち、
この被覆金属板は、金属板１の表面上に、熱可塑性樹脂
からなる被覆層２を有し、さらに該被覆層２上に、斑点
状に形成した機能化部分３を有するものである。特に、
機能化部分３は、図示のように、被覆層２中に埋没し、
その一部が被覆層２の表面に点状に分散露出して形成す
る。Next, a thermoplastic resin-coated metal plate of the present invention will be described with reference to FIG. That is,
This coated metal plate has a coating layer 2 made of a thermoplastic resin on the surface of a metal plate 1, and further has a spotted functionalized portion 3 on the coating layer 2. In particular,
The functionalized part 3 is buried in the coating layer 2 as shown,
A part thereof is formed on the surface of the coating layer 2 so as to be dispersed and exposed in a dot shape.

【００１６】このような構成とすることにより、最表面
に熱可塑性樹脂による特性と、斑点状に形成された機能
化部分による特性とを混在させることができる結果、最
表層に熱可塑性樹脂にはない機能が付与された、あるい
は熱可塑性樹脂の欠点を改善した、金属板となる。With this configuration, the characteristics of the thermoplastic resin on the outermost surface and the characteristics of the functionalized portions formed in spots can be mixed. As a result, the outermost layer has no thermoplastic resin. It is a metal plate to which no function is given or in which the disadvantages of thermoplastic resin are improved.

【００１７】ここで、金属板１は、特に限定する必要は
なく、冷延鋼板、溶融亜鉛めっき鋼板、５％Ａｌ−Ｚｎ
めっき鋼板（ガルファン：ＧＦ）、５５％Ａｌ−Ｚｎめ
っき鋼板（ガルバリウム：ＧＬ）、アルミめっき鋼板、
ステンレス鋼板、ティンフリー鋼板等を用いることがで
き、これら鋼板の表面には、必要に応じて、脱脂処理、
リン酸塩処理、塗布型クロメート処理、防錆プライマー
塗布、着色トップ塗布および印刷のいずれかの処理、も
しくはこれらを組み合わせた処理を施してもよい。Here, the metal plate 1 need not be particularly limited, and may be a cold-rolled steel plate, a hot-dip galvanized steel plate, or 5% Al-Zn.
Galvanized steel sheet (galfan: GF), 55% Al-Zn plated steel sheet (galvalume: GL), aluminized steel sheet,
Stainless steel sheets, tin-free steel sheets, etc. can be used, and the surfaces of these steel sheets are degreased,
Any of phosphate treatment, coating-type chromate treatment, rust-preventive primer application, colored top application and printing, or a combination thereof may be applied.

【００１８】次に、被覆層２を構成する熱可塑性樹脂に
は、フッ化ビニル樹脂（ＰＶＦ）やフッ化ビニリデン樹
脂（ＰＶｄＦ）、４フッ化エチレンーエチレン共重合樹
脂（ＥＴＦＥ）、４フッ化エチレンー６フッ化プロピレ
ン共重合樹脂（ＦＥＰ）、４フッ化エチレンーバーフル
オロアルキルビニルエーテル共重合樹脂（ＰＦＡ）、４
フッ化エチレン樹脂（ＰＴＦＥ）等のふっ素樹脂、ポリ
エチレン樹脂（ＰＥ）、ポリプロピレン樹脂（ＰＰ）、
ポリメチルペンテン樹脂（ＰＭＰ）、ポリ塩化ビニル樹
脂（ＰＶＣ）、ポリ塩化ビニリデン樹脂（ＰＶＤＣ）、
ＡＢＳ樹脂、ポリステレン樹脂（ＰＳ）、ＡＳ樹脂、メ
タクリル系樹脂、ポリビニールアルコール樹脂（ＰＶ
Ａ）、ＥＶＡ樹脂、ポリアミド系樹脂、ポリアセタール
系樹脂、ポリカーボネート樹脂（ＰＣ）、変性ポリフェ
ニレンエーテル樹脂（ＰＰＥ）、熱可塑性ポリエステル
樹脂、ポリフェニレンスルフィド樹脂（ＰＰＳ）、ポリ
スルホン樹脂、ポリエーテルイミド樹脂（ＰＥＩ）、ポ
リエーテルスルホン樹脂（ＰＥＳ）、ポリエーテルケト
ン樹脂（ＰＥＥＫ）、ポリアミドイミド樹脂（ＰＡ
Ｉ）、ポリイミド樹脂（ＰＩ）および各種熱可塑性エラ
ストマー等を用いることができ、これらを主成分とした
ものであれば、熱硬化性樹脂、着色顔料、無機系骨材、
界面活性剤、増粘助剤等が添加されたものでも構わず、
また２種類以上の熱可塑性樹脂をブレンドしても構わな
い。Next, the thermoplastic resin constituting the coating layer 2 includes vinyl fluoride resin (PVF), vinylidene fluoride resin (PVdF), tetrafluoroethylene-ethylene copolymer resin (ETFE), and tetrafluoride. Ethylene hexafluoropropylene copolymer resin (FEP), tetrafluoroethylene-fluorofluorovinylether copolymer resin (PFA),
Fluorine resin such as fluorinated ethylene resin (PTFE), polyethylene resin (PE), polypropylene resin (PP),
Polymethylpentene resin (PMP), polyvinyl chloride resin (PVC), polyvinylidene chloride resin (PVDC),
ABS resin, polysterene resin (PS), AS resin, methacrylic resin, polyvinyl alcohol resin (PV
A), EVA resin, polyamide resin, polyacetal resin, polycarbonate resin (PC), modified polyphenylene ether resin (PPE), thermoplastic polyester resin, polyphenylene sulfide resin (PPS), polysulfone resin, polyetherimide resin (PEI) , Polyethersulfone resin (PES), polyetherketone resin (PEEK), polyamideimide resin (PA
I), polyimide resin (PI), various thermoplastic elastomers, and the like can be used. If these are the main components, thermosetting resins, coloring pigments, inorganic aggregates,
Surfactants, thickeners, etc. may be added,
Further, two or more kinds of thermoplastic resins may be blended.

【００１９】ただし、後述するように、熱可塑性樹脂の
被覆層に機能化部分を点状に塗布した後に、熱可塑性樹
脂の融点もしくは軟化点以上の温度で加熱されることか
ら、前記添加物は、熱可塑性樹脂の融点もしくは軟化点
以上の温度に加熱されても、熱劣化しない耐熱性を有す
る必要がある。またこれらの熱可塑性樹脂は、水、有機
溶剤等を媒体とした塗料、もしくは溶融押出し成形性が
良好な樹脂であればフィルムとして金属板に被覆できれ
ばよく、塗料の塗装方法、フィルムのラミネート方法、
これらの膜厚は特に限定されるものではない。However, as described below, after the functionalized portion is applied to the coating layer of the thermoplastic resin in the form of dots, the heating is performed at a temperature equal to or higher than the melting point or the softening point of the thermoplastic resin. It is necessary to have heat resistance that does not cause thermal degradation even when heated to a temperature higher than the melting point or softening point of the thermoplastic resin. In addition, these thermoplastic resins, paints using water, an organic solvent or the like as a medium, or a resin having good melt extrusion moldability, as long as it can be coated on a metal plate as a film, a coating method of the paint, a lamination method of the film,
These film thicknesses are not particularly limited.

【００２０】また、熱可塑性樹脂を透光性のあるものと
することによって、下地の金属板１の表面に施した意匠
を発現させてもよい。The design applied to the surface of the underlying metal plate 1 may be exhibited by making the thermoplastic resin translucent.

【００２１】そして、熱可塑性樹脂の被覆層２上に設け
る機能化部分３は、水、有機溶剤等の媒体に、熱可塑性
物質とは物性の異なる物質で機能を付与するための物質
(機能性物質) を添加した液状物を、スプレー式や回転
霧化式等の斑点状塗装装置で、熱可塑性樹脂表面に斑点
状に塗布することによって、形成する。この機能性物質
によってもたらされる機能としては、抗菌性、防かび
性、耐汚染性、非粘着性、離型性、加工性、潤滑性、耐
摩耗性、耐傷付き性、親水性、疎水性、環境浄化性、帯
電防止性、溶接性等が挙げられる。この液状物には、熱
可塑性樹脂はもちろん、熱硬化性樹脂、着色顔料、無機
系骨材、界面活性剤、増粘助剤等が添加されたものでも
構わない。また複数の機能性物質を混合することによっ
て、複数の機能を付与することも可能である。The functionalized portion 3 provided on the thermoplastic resin coating layer 2 is a material for imparting a function to a medium such as water or an organic solvent with a material having a property different from that of the thermoplastic material.
The liquid material to which the (functional substance) is added is formed by applying a spot-like coating device such as a spray type or a rotary atomizing type to the surface of the thermoplastic resin in a spot-like manner. Functions provided by this functional substance include antibacterial properties, fungicidal properties, stain resistance, non-adhesive properties, mold release properties, workability, lubricity, abrasion resistance, scratch resistance, hydrophilicity, hydrophobicity, Examples include environmental purification properties, antistatic properties, and weldability. The liquid material may be a material to which a thermosetting resin, a coloring pigment, an inorganic aggregate, a surfactant, a thickening aid and the like are added as well as a thermoplastic resin. A plurality of functions can be imparted by mixing a plurality of functional substances.

【００２２】ここで、使用可能である機能性物質を、そ
の作用毎に例示すると、次のとおりである。 抗菌性： 銀, 銅, 亜鉛, マグネシウム等の金属もしく
はそれらの化合物、酸化チタン等の光触媒性化合物、ゼ
オライト, アパタイト等の無機系化合物、フタルイミド
系, チアゾロン系の有機系化合物 防かび性： ピリジン系、トリアジン系、イミダゾール
系、チアゾール系、ヨード系、ニトリル系、フェノール
系等の有機系防かび剤 非粘着性・離型性・疎水性： ふっ素樹脂 加工性・潤滑性： ふっ素樹脂パウダー、アクリル等の
樹脂ビーズ、ポリオレフィン系樹脂粒子ワックス、ステ
アリン酸カルシウム等の固体潤滑剤 耐摩耗性・耐傷付き性： チタン酸カリウム、炭化けい
素、アルミナ、ガラス、二硫化モリブデン等の粒状もし
くは繊維状の無機系骨材 帯電防止性・溶接性： 亜鉛、ステンレス、鉄系合金等
の導電性フィラーもしくは粉末 耐汚染性・環境浄化性・親水性： 酸化チタン、酸化亜
鉛、ゼオライト、結晶性アルミノシリケート、チタニウ
ムアルコキシド、チタニウムキレート等の光触媒作用を
有する化合物Here, functional materials that can be used are exemplified as follows for each action. Antibacterial properties: metals such as silver, copper, zinc and magnesium or their compounds, photocatalytic compounds such as titanium oxide, inorganic compounds such as zeolite and apatite, phthalimide-based and thiazolone-based organic compounds Fungicidal properties: pyridine-based , Triazine-based, imidazole-based, thiazole-based, iodine-based, nitrile-based, phenol-based, and other organic fungicides Non-adhesive, releasable, and hydrophobic: fluororesin Workability and lubricity: fluororesin powder, acrylic, etc. Solid lubricants such as resin beads, polyolefin resin particle wax, calcium stearate, etc. Wear and scratch resistance: Granular or fibrous inorganic bone such as potassium titanate, silicon carbide, alumina, glass, molybdenum disulfide, etc. Material Antistatic / weldability: conductive filler or powder such as zinc, stainless steel, iron alloy, etc. Dyeing / environmental purification / hydrophilic: Photocatalytic compounds such as titanium oxide, zinc oxide, zeolite, crystalline aluminosilicate, titanium alkoxide, and titanium chelate

【００２３】特に、機能化部分３は、金属板１表面の被
覆層２に、各々の直径が０．５〜１５ｍｍおよび表面被
覆率１０〜９０％で斑点状に分散して設けることが好ま
しい。なぜなら、直径が０．５ｍｍ未満では機能の付与
が乏しく、一方１５ｍｍを超えると機能性部分の厚みが
厚くなり、該部分が樹脂を主成分とする場合は、いわゆ
るワキという塗装欠陥が発生し易くなり、また樹脂を含
まない場合は、加工時に機能化物質が欠落し易くなるこ
とがある。好ましくは１〜１０ｍｍである。ここで、機
能化部分３の径とは、熱可塑性樹脂の融点以上もしくは
軟化点以上、かつ熱分解温度以下で加熱して得られた金
属板表面に発現する機能化部分個々の径のことであり、
その機能化部分３がほぼ真円に近い場合はその直径を、
また楕円状になった場合は、その最大と最小直径の平均
値のことである。なお、本発明で提案する点状塗装装置
では、この径を揃えることはできず、また金属板表面上
での塗布位置も不規則であり、ランダムな模様となる。In particular, it is preferable that the functionalized portion 3 is provided on the coating layer 2 on the surface of the metal plate 1 in a spot-like manner with a diameter of 0.5 to 15 mm and a surface coverage of 10 to 90%. The reason is that if the diameter is less than 0.5 mm, the function is poorly imparted, while if it exceeds 15 mm, the thickness of the functional portion is increased, and when the portion is mainly composed of a resin, so-called waki paint defects are likely to occur. If no resin is contained, the functionalized substance may be easily lost during processing. Preferably it is 1 to 10 mm. Here, the diameter of the functionalized portion 3 refers to the diameter of each functionalized portion that appears on the surface of the metal plate obtained by heating at a temperature higher than the melting point or softening point of the thermoplastic resin and lower than the thermal decomposition temperature. Yes,
If the functionalized part 3 is almost a perfect circle, its diameter is
In the case of an elliptical shape, it means the average value of the maximum and minimum diameters. In the point coating apparatus proposed in the present invention, the diameter cannot be made uniform, and the coating position on the metal plate surface is also irregular, resulting in a random pattern.

【００２４】また、表面被覆率が１０％未満では、機能
の付与が乏しく、一方９０％をこえると、被覆層の特性
が発現できなくなる。これら機能性部分の直径および表
面被覆率は、その目的とする機能性によって適宜決定す
ればよい。When the surface coverage is less than 10%, the function is poorly imparted. On the other hand, when it exceeds 90%, the characteristics of the coating layer cannot be exhibited. The diameter and the surface coverage of these functional portions may be appropriately determined depending on the intended functionality.

【００２５】以上のように、本発明の熱可塑性樹脂被覆
金属板は、熱可塑性樹脂を主成分とする被覆層を有する
金属板の最表層に、その熱可塑性樹脂とは物性の異なる
物質からなる機能化表層を斑点状に形成したため、それ
ぞれの性能を個々にかつ効果的に付与できる。一方、熱
可塑性樹脂と機能性物質とを単純に混合して得られたも
のの表面は、互いに優れた特性を充分に発揮できず、場
合によっては打ち消し合うために、目的の性能を得られ
ない場合が多い。As described above, the thermoplastic resin-coated metal plate of the present invention comprises, as the outermost layer of a metal plate having a coating layer mainly composed of a thermoplastic resin, a material having different physical properties from that of the thermoplastic resin. Since the functionalized surface layer is formed in a spot-like manner, each performance can be individually and effectively provided. On the other hand, the surface of a material obtained by simply mixing a thermoplastic resin and a functional material does not sufficiently exhibit mutually excellent properties, and in some cases cancel each other, so that the desired performance cannot be obtained. There are many.

【００２６】以下に、前記した熱可塑性樹脂被覆金属板
の製造方法について、詳しく説明する。本発明の方法
は、金属板に熱可塑性樹脂を塗布し、その熱可塑性樹脂
上に、熱可塑性樹脂とは物性の異なる液状物、つまり
水、有機溶剤等の媒体に機能性物質を添加した液状物
を、好ましくは直径０．５〜１５ｍｍおよび表面被覆率
１０〜９０％にて、分散させて塗布し、その金属板を熱
可塑性樹脂の融点もしくは軟化点以上、かつ熱分解温度
以下で加熱する。Hereinafter, the method for producing the above-mentioned thermoplastic resin-coated metal sheet will be described in detail. The method of the present invention is a method in which a thermoplastic resin is applied to a metal plate, and a liquid material having different physical properties from the thermoplastic resin on the thermoplastic resin, that is, water, a liquid obtained by adding a functional substance to a medium such as an organic solvent. The product is dispersed and applied, preferably with a diameter of 0.5 to 15 mm and a surface coverage of 10 to 90%, and the metal plate is heated above the melting point or softening point of the thermoplastic resin and below the thermal decomposition temperature. .

【００２７】すなわち、金属板を熱可塑性樹脂の融点も
しくは軟化点以上、かつ熱分解温度以下で加熱すること
によって、斑点状に塗布された液状物中の媒体が蒸発除
去され、液状物中の機能性添加物が熱可塑性樹脂と反応
もしくは相互溶解性のあるものはもちろん、それらがな
いものでも、溶融した熱可塑性樹脂表面に物理的に埋没
する。That is, by heating the metal plate at a temperature higher than the melting point or softening point of the thermoplastic resin and lower than the thermal decomposition temperature, the medium in the liquid material applied in the form of spots is evaporated and removed. Even if the thermoplastic additive reacts with or is mutually soluble with the thermoplastic resin, it is physically embedded in the melted thermoplastic resin surface, even if it is absent.

【００２８】特に、機能化部分をより強固に密着させた
い場合は、熱可塑性樹脂と密着性を有する樹脂をベース
とした塗料等として機能性物質を塗布すればよく、例え
ば、熱可塑性樹脂被覆層と同じ熱可塑性樹脂のディスパ
ージョン等に機能性物質を分散したものを用いるのが望
ましい。In particular, when it is desired to make the functionalized portion adhere more firmly, a functional substance may be applied as a paint or the like based on a resin having adhesiveness to the thermoplastic resin. It is desirable to use a dispersion of a functional substance in the same thermoplastic resin dispersion as described above.

【００２９】また、必要に応じて、機能性物質を含有す
る液状物を塗布したのち、熱可塑性樹脂が融点もしくは
軟化点以上の温度のうちに、冷却機能を有するロールで
圧下し、圧下後の金属板の温度を熱可塑性樹脂の融点も
しくは軟化点以下に制御する工程を付加することもでき
る。この工程を付加することによって、機能化部を点在
させた被覆層の表面を平滑化でき、熱可塑性樹脂の被覆
層への機能化部の埋没をより効果的に行える。Further, if necessary, after applying a liquid material containing a functional substance, the thermoplastic resin is rolled down with a roll having a cooling function at a temperature not lower than the melting point or the softening point. A step of controlling the temperature of the metal plate below the melting point or softening point of the thermoplastic resin may be added. By adding this step, the surface of the coating layer in which the functionalized portions are scattered can be smoothed, and the functionalized portion can be more effectively buried in the coating layer of the thermoplastic resin.

【００３０】さらに、熱可塑性樹脂の被覆層が塗膜の場
合は、その塗膜が未乾燥の液状塗膜の状態にあるうち
に、機能化部を斑点状に塗装することによって、物理的
埋没がより効果的に行える。一方、熱可塑性樹脂の被覆
層が乾燥固化した塗膜もしくはフィルムの場合は、機能
性物質を含有した液状物の粘度が低いと加熱炉内の熱風
で流される場合があるため、樹脂や増粘剤等である程度
の粘度を持った液状物として塗布することが望ましい。Further, when the coating layer of the thermoplastic resin is a coating film, the functionalized portion is applied in a spot-like manner while the coating film is in the state of an undried liquid coating film, so that it is physically buried. Can be performed more effectively. On the other hand, in the case of a coating or film in which the coating layer of the thermoplastic resin is dried and solidified, if the viscosity of the liquid material containing the functional substance is low, it may be washed away by the hot air in the heating furnace, so that the resin or the viscosity increase It is desirable to apply as a liquid having a certain viscosity with an agent or the like.

【００３１】ここで、機能性物質を添加した液状物を斑
点状に塗布するには、スプレー式や回転霧化式等の点状
塗装装置を用いるとよい。これらの斑点状塗装装置装置
は、スプレー式は空気圧を、回転霧化式は遠心力をそれ
ぞれ利用し、吐出ロより微細粒径の液体を吹き出す機構
を備え、吹き出された液体は、空気の抵抗によりいわゆ
るレインドロップの形状で飛散し、ウェット状態の接着
樹脂層の表面に衝突すると円形の点状となる。これらの
斑点状塗装装置は、版ロールと比較してランニングコス
トに優れ、熱可塑性樹脂を加熱する焼付炉の前に設置す
ればよく、設置スペースをそれほど必要としないことか
ら、その斑点状塗装装置を複数設置することによって
も、複数の機能化部を容易に形成することが可能であ
る。Here, in order to apply the liquid material to which the functional substance is added in a spot-like manner, it is preferable to use a point-type coating apparatus such as a spray type or a rotary atomization type. These spot-like coating apparatuses use a pneumatic pressure for the spray type and a centrifugal force for the rotary atomizing type, and have a mechanism for blowing a liquid having a fine particle diameter from a discharge roller. Scattered in the form of a so-called raindrop, and when it collides with the surface of the adhesive resin layer in a wet state, a circular dot is formed. These spot coating devices are superior in running cost compared to plate rolls, and need only be installed in front of a baking furnace that heats the thermoplastic resin, and do not require much installation space. It is also possible to easily form a plurality of functionalized parts by installing a plurality of the.

【００３２】[0032]

〔発明例１〕[Invention Example 1]

抗菌性耐熱ふっ素塗装金属板 ステンレス鋼板（ＳＵＳ４３０、２Ｂ仕上げ、板厚０．
５ｍｍ）に塗布型クロメート処理を施し、次いで、ＰＴ
ＦＥ（融点３２７℃）とＰＥＳと着色顔料とが４：２：
１の固形分比率で混合された、黒メタリック色の耐熱ふ
っ素樹脂塗料を乾燥膜厚で１５μｍになるように塗布
し、その耐熱ふっ素樹脂の塗膜がウェット状態のうち
に、同じ耐熱ふっ素樹脂塗料に無機系抗菌剤（銀−複合
セラミックス担体）を、前記の総固形分に対して５０％
添加した抗菌機能を有する液状物を、回転霧化式の塗装
装置で斑点状（焼付後の平均直径２ｍｍ、表面被覆率４
０％）に塗布し、次いで、最高到達板温が４００℃にな
るように焼き付け、空冷および水冷し、最表面に抗菌性
を有する耐熱ふっ素樹脂塗装金属板を得た。Antibacterial heat-resistant fluorine coated metal plate Stainless steel plate (SUS430, 2B finish, plate thickness 0.
5 mm), and apply a coating type chromate treatment.
FE (melting point: 327 ° C.), PES, and color pigment: 4: 2:
A heat-resistant fluororesin paint of black metallic color mixed at a solid content ratio of 1 is applied so as to have a dry film thickness of 15 μm, and the heat-resistant fluororesin paint is applied while the heat-resistant fluororesin coating film is in a wet state. With an inorganic antibacterial agent (silver-composite ceramic carrier) at 50% of the total solid content.
The added liquid material having an antimicrobial function was spotted (average diameter after baking: 2 mm, surface coverage: 4) by a rotary atomizing type coating device.
0%), and then baked so that the maximum temperature of the sheet reaches 400 ° C., and air-cooled and water-cooled to obtain a heat-resistant fluororesin-coated metal sheet having an antibacterial property on the outermost surface.

【００３３】〔比較例１〕ステンレス鋼板（ＳＵＳ４３
０、２Ｂ仕上げ、板厚０．５ｍｍ）に塗布型クロメート
処理を施し、次いで、発明例１で使用した耐熱ふっ素樹
脂塗料に無機系抗菌剤を５０％添加した抗菌機能を有す
る耐熱ふつ素樹脂塗料を乾燥膜厚で１５μｍになるよう
に塗布し、最高到達板温が４００℃になるように焼き付
け、空冷および水冷し、抗菌性を有する耐熱ふっ素樹脂
塗装金属板を得た。[Comparative Example 1] Stainless steel plate (SUS43)
0, 2B finish, plate thickness 0.5 mm), and then apply a coating type chromate treatment, and then add 50% of an inorganic antibacterial agent to the heat-resistant fluororesin paint used in Invention Example 1 to have a heat-resistant fluororesin paint having an antibacterial function. Was applied so as to have a dry film thickness of 15 μm, baked so that the maximum temperature of the sheet reached 400 ° C., and air-cooled and water-cooled to obtain a heat-resistant fluororesin-coated metal sheet having antibacterial properties.

【００３４】〔比較例２〕耐熱ふっ素樹脂塗料に無機系
抗菌剤を添加しない以外は、比較例１と同様な耐熱ふっ
素樹脂塗装金属板を得た。Comparative Example 2 A heat-resistant fluororesin-coated metal plate similar to that of Comparative Example 1 was obtained except that no inorganic antibacterial agent was added to the heat-resistant fluororesin paint.

【００３５】かくして得られた発明例１および比較例
１、２について、以下の特性評価試験を行った。 抗菌力試験： 寒天培地で３５℃、２日間培養した大腸
菌体を１／５００の普通ブイヨン培地に均一に分散し、
１ｍｌ当たりの菌数が約１０⁶ ／ｍｌとなるように調
整した菌液を、表面をエタノールで洗浄殺菌した試験片
に０．５ｍｌ滴下し、その上にポリエチレンフィルムを
かぶせ、３５℃、相対湿度９０％以上の条件下で２４時
間保存した。この２４時間保存した試験片を、ＳＣＤＬ
Ｐ培地 (日本製薬 (株) 製) １０ｍｌで洗い出し、この
洗い出し液で標準寒天培地 (ＳＡ)を用いた平板塗沫培
養（３５℃、７日間）し、生菌数を測定した。その生薗
数が１００個以下の場合を良好（○）、１００個以上を
不良（×）とした。With respect to the invention example 1 and the comparative examples 1 and 2 thus obtained, the following characteristic evaluation tests were performed. Antibacterial activity test: Escherichia coli cells cultured on an agar medium at 35 ° C. for 2 days were uniformly dispersed in 1/500 ordinary broth medium,
0.5 ml of a bacterial solution adjusted so that the number of bacteria per 1 ml becomes about 10 ⁶ / ml was dropped on a test piece whose surface was washed and sterilized with ethanol, and a polyethylene film was placed on the test piece. It was stored for 24 hours under the condition of 90% or more. The test specimen stored for 24 hours was subjected to SCDL
The medium was washed with 10 ml of P medium (manufactured by Nippon Pharmaceutical Co., Ltd.), and the washed liquid was subjected to plate smear culture using a standard agar medium (SA) (35 ° C., 7 days), and the viable cell count was measured. The case where the number of Ikuzono was 100 or less was evaluated as good (○), and the case with 100 or more was evaluated as poor (×).

【００３６】耐食品汚染物焦付き性試験： 卵、醤油、
砂糖を等量で混合した食品汚染物を試験片表面に滴下
し、２６０℃で１５分加熱し、室温にて冷却後、焦付き
の除去性およびこびり付きを評価した。Food stain resistance test: Egg, soy sauce,
A food contaminant in which sugar was mixed in an equal amount was dropped on the surface of the test piece, heated at 260 ° C. for 15 minutes, cooled at room temperature, and evaluated for scorch removability and sticking.

【００３７】曲げ加工性試験： ＪＩＳＧ３３１２Ｋに
準じ、試験片を１８０度ＯＴ密着曲げに供し、曲げ加工
部での塗膜割れと剥離を５段階（劣１←→５優）で評価
した。Bending workability test: According to JIS G3312K, the test piece was subjected to 180 ° OT close contact bending, and the coating film cracking and peeling at the bent portion was evaluated in five steps (poor 1 ← → 5 excellent).

【００３８】発明例１および比較例１、２の特性評価試
験結果を表１に示すように、本発明にかかる耐熱ふっ素
樹脂塗装金属板は、本来の性能を低下させることなく抗
菌性が付与されていることがわかった。As shown in Table 1, the results of the property evaluation test of Invention Example 1 and Comparative Examples 1 and 2 show that the heat-resistant fluororesin-coated metal sheet according to the present invention has antibacterial properties without deteriorating its original performance. I understood that.

【００３９】[0039]

【表１】 [Table 1]

【００４０】〔発明例２〕 高潤滑性ふっ素樹脂フィルムラミネート金属板 ステンレス鋼板（ＳＵＳ４３０、２Ｂ仕上げ、板厚０．
５ｍｍ）に塗布型クロメート処理を施し、次いで、ＦＥ
ＰとＰＥＳと着色顔料とが４：１：１の固形分比率で混
合された熱融着型プライマーを乾燥膜厚で１０μｍにな
るように塗布し、最高到達板温が４００℃になるように
焼き付け、徐冷しながら板温が３５０℃の時に厚さ５０
μｍのＰＦＡフィルム（融点３０５℃）をシリコンゴム
製上ロールおよび鉄製下ロールの１対のラミネートロー
ルでラミネートした。その金属板の表面に、ＰＴＦＥデ
ィスパージョンに平均長さ１０μｍのガラス繊維を固形
分比で２５％添加した液状物を、回転霧化式の塗装装置
で斑点状（焼付後の平均直径１ｍｍ、表面被覆率７０
％）に塗布し、最高到達板温が４００℃になるように焼
き付け、徐冷しながら板温が３３０℃の時に、シリコン
ゴム製上ロールおよび鉄製下ロールの１対のラミネート
ロールで圧下し（圧下後の板温が２８０℃になるよう両
ロール温度を約１５０℃に調整）、最表面の耐磨耗性を
向上させたふっ素樹脂フィルムラミネート金属板を得
た。[Invention Example 2] High lubricating fluororesin film laminated metal plate Stainless steel plate (SUS430, 2B finish, plate thickness of 0.1 mm)
5 mm) is subjected to a coating type chromate treatment, and then FE
A heat-fusible primer in which P, PES, and a color pigment are mixed at a solid content ratio of 4: 1: 1 is applied so as to have a dry film thickness of 10 μm, and the maximum plate temperature is to be 400 ° C. Baking and slow cooling, when the plate temperature is 350 ° C, thickness 50
A μm PFA film (melting point: 305 ° C.) was laminated with a pair of laminating rolls, an upper roll made of silicone rubber and a lower roll made of iron. A liquid material obtained by adding 25% of a glass fiber having an average length of 10 μm to a PTFE dispersion at a solid content ratio of 25% on a surface of the metal plate was spotted by a rotary atomizing type coating apparatus (average diameter after baking, 1 mm, surface). Coverage 70
%), Baked so that the maximum attained plate temperature becomes 400 ° C., and gradually lower it with a pair of laminating rolls of a silicon rubber upper roll and an iron lower roll when the plate temperature is 330 ° C. while slowly cooling ( The temperature of both rolls was adjusted to about 150 ° C. so that the sheet temperature after the reduction was 280 ° C.) to obtain a fluororesin film-laminated metal sheet with improved abrasion resistance on the outermost surface.

【００４１】〔比較例３〕最表層にガラス繊維含有ＰＴ
ＦＥによる耐磨耗性向上部位を形成しない以外は、発明
例２と同様な耐熱ふっ素樹脂フィルムラミネート金属板
を得た。[Comparative Example 3] Glass fiber-containing PT was formed on the outermost layer.
A heat-resistant fluororesin film-laminated metal plate was obtained in the same manner as in Inventive Example 2, except that the abrasion resistance-improved portion was not formed by FE.

【００４２】かくして得られた発明例２および比較例３
について、次の特性評価試験を行った。 耐磨耗性試験： 試験片のふっ素樹脂フィルム面が内側
になるように、内径１２ｍｍの円筒を作製し、その内面
に直径１０ｍｍの研き鋼製シャフトを荷重５０ｋｇｆ／
ｃｍがかかるように配置し、５０℃の温度で１００ｃｍ
／秒の速度でシャフトを回転させ、素地が露出するまで
の限界回転数で評価した。Inventive Example 2 and Comparative Example 3 thus obtained
The following property evaluation test was conducted for Abrasion resistance test: A cylinder having an inner diameter of 12 mm was prepared so that the fluororesin film surface of the test piece was on the inside, and a sharpened steel shaft having a diameter of 10 mm was loaded on the inner surface with a load of 50 kgf /.
cm at a temperature of 50 ° C and 100cm
The shaft was rotated at a speed of / sec, and the evaluation was made at the limit rotation speed until the substrate was exposed.

【００４３】発明例２および比較例３の特性評価試験結
果を表２に示す。表２から、本発明にかかるふっ素樹脂
ラミネート金属板は耐磨耗性を格段に向上できることが
わかった。Table 2 shows the characteristic evaluation test results of Inventive Example 2 and Comparative Example 3. From Table 2, it was found that the fluororesin laminated metal sheet according to the present invention can significantly improve the abrasion resistance.

【００４４】[0044]

【表２】 [Table 2]

【００４５】なお、前記の実施例では、代表的な熱可塑
性樹脂であるふっ素樹脂を用いて説明しているが、ベー
スとなる被覆層が熱可塑性樹脂を主成分としていれば、
本発明が適用可能であること、また実施例以外の機能の
付与も容易であることは勿論である。In the above embodiment, a description is given using a fluororesin which is a typical thermoplastic resin. However, if the base coating layer contains a thermoplastic resin as a main component,
It is needless to say that the present invention is applicable and that functions other than those of the embodiments can be easily provided.

【００４６】[0046]

【発明の効果】以上説明したように、本発明にかかる最
表層を機能化した熱可塑性樹脂を被覆した金属板は、熱
可塑性樹脂が持つ様々な優れた性質を低下させることな
く、効果的にその熱可塑性樹脂を被覆した金属板とは異
なる機能を付加し、あるいはその欠点を改善することが
できる。それ故に、内外装用建材、家電製品、食品容
器、非食品容器および加熱調理器具等の幅広い用途に適
合する、優れた素材を提供することができる。As described above, the metal plate coated with a thermoplastic resin having a functionalized outermost layer according to the present invention can be effectively used without deteriorating various excellent properties of the thermoplastic resin. A function different from that of the metal plate coated with the thermoplastic resin can be added or its disadvantage can be improved. Therefore, it is possible to provide an excellent material suitable for a wide range of uses such as interior / exterior building materials, home appliances, food containers, non-food containers, and cooking utensils.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の熱可塑性樹脂被覆金属板の構造を示す
図である。FIG. 1 is a view showing a structure of a thermoplastic resin-coated metal plate of the present invention.

【符号の説明】[Explanation of symbols]

１ 金属板 ２ 被覆層 ３ 機能化部 DESCRIPTION OF SYMBOLS 1 Metal plate 2 Coating layer 3 Functional part

フロントページの続き Ｆターム(参考） 4F100 AA17H AB01A AB04 AB17H AB18H AB24H AC04H AG00H AK01B AK01C AK17 AK18 AK41 BA03 BA07 BA10A BA10C BA44C CA13 CA19C CA22C CA23C CA30 CA30C DC21C DE01 EH46B EH462 EJ193 EJ423 EJ503 EJ691 GB08 GB16 GB23 GB48 HB00 JB16B JC00 JK09 JL06Continued on the front page F-term (reference) 4F100 AA17H AB01A AB04 AB17H AB18H AB24H AC04H AG00H AK01B AK01C AK17 AK18 AK41 BA03 BA07 BA10A BA10C BA44C CA13 CA19C CA22C CA23C CA30 CA30C DC21C DE01 EH46BEJB48 EB16 GBH EJ8 JL06

Claims (7)

【特許請求の範囲】[Claims] 【請求項１】 金属板の表面に、熱可塑性樹脂を主成分
とする被覆層を有し、該被覆層の表面に、前記熱可塑性
樹脂とは物性の異なる物質からなる機能化表層を斑点模
様状に形成してなることを特徴とする熱可塑性樹脂被覆
金属板。1. A surface of a metal plate having a coating layer containing a thermoplastic resin as a main component, and a functionalized surface layer made of a substance having a property different from that of the thermoplastic resin is spotted on the surface of the coating layer. A thermoplastic resin-coated metal plate characterized by being formed into a shape. 【請求項２】 請求項１において、被覆層が塗膜または
フィルムであることを特徴とする熱可塑性樹脂被覆金属
板。2. The thermoplastic resin-coated metal sheet according to claim 1, wherein the coating layer is a coating film or a film. 【請求項３】 請求項１において、斑点模様を呈する上
記機能化表層は、径が０．５〜１５ｍｍの大きさの、熱
可塑性樹脂とは異なる物性を示す物質を、表面被覆率１
０〜９０％にて点状に分散したものからなることを特徴
とする熱可塑性樹脂被覆金属板。3. The functionalized surface layer according to claim 1, wherein the functionalized surface layer having a spotted pattern is made of a material having a diameter of 0.5 to 15 mm and having physical properties different from that of a thermoplastic resin.
A thermoplastic resin-coated metal plate, which is composed of particles dispersed in a point-like manner at 0 to 90%. 【請求項４】 熱可塑性樹脂を主成分とする被覆層を有
する、金属板の表面に、前記熱可塑性樹脂とは物性の異
なる液状物を、径：０．５〜１５ｍｍおよび表面被覆
率：１０〜９０％にて点状に塗布したのち、金属板を熱
可塑性樹脂の融点以上もしくは軟化点以上、かつ熱分解
温度以下で加熱することを特徴とする熱可塑性樹脂被覆
金属板の製造方法。4. A liquid material having physical properties different from that of the thermoplastic resin, having a diameter of 0.5 to 15 mm and a surface coverage of 10 on the surface of a metal plate having a coating layer mainly composed of a thermoplastic resin. A method for producing a thermoplastic resin-coated metal plate, which comprises applying a dot-like coating at a temperature of up to 90%, and then heating the metal plate at a temperature equal to or higher than the melting point or softening point of the thermoplastic resin and equal to or lower than the thermal decomposition temperature. 【請求項５】 請求項４において、金属板の加熱に引き
続き、熱可塑性樹脂の融点以上もしくは軟化点以上の温
度のうちに、冷却機能を有するロールで圧下し、その後
金属板の温度を熱可塑性樹脂の融点未満もしくは軟化点
未満に制御することを特徴とする熱可塑性樹脂被覆金属
板の製造方法。5. The method according to claim 4, wherein, following the heating of the metal plate, the temperature of the thermoplastic resin is reduced by a roll having a cooling function at a temperature equal to or higher than the melting point or the softening point of the thermoplastic resin. A method for producing a thermoplastic-coated metal sheet, wherein the temperature is controlled to be lower than the melting point or lower than the softening point of the resin. 【請求項６】 請求項４または５において、乾燥固化し
た塗膜の状態にある被覆層に液状物を塗布することを特
徴とする熱可塑性樹脂被覆金属板の製造方法。6. The method for producing a thermoplastic resin-coated metal sheet according to claim 4, wherein a liquid material is applied to the coating layer in a state of a dried and solidified coating film. 【請求項７】 請求項４または５において、未乾燥の液
状塗膜の状態にある被覆層に液状物を塗布することを特
徴とする熱可塑性樹脂被覆金属板の製造方法。7. The method for producing a thermoplastic resin-coated metal sheet according to claim 4, wherein a liquid material is applied to the coating layer in a state of an undried liquid coating film.