JP4194054B2 - Conductive layer transfer sheet for producing conductive synthetic resin plate, and method for producing conductive synthetic resin plate using the same - Google Patents

Conductive layer transfer sheet for producing conductive synthetic resin plate, and method for producing conductive synthetic resin plate using the same Download PDF

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JP4194054B2
JP4194054B2 JP05683796A JP5683796A JP4194054B2 JP 4194054 B2 JP4194054 B2 JP 4194054B2 JP 05683796 A JP05683796 A JP 05683796A JP 5683796 A JP5683796 A JP 5683796A JP 4194054 B2 JP4194054 B2 JP 4194054B2
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synthetic resin
conductive
resin plate
conductive layer
producing
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JPH09226044A (en
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隆幸 根本
勝 石井
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Kimoto Co Ltd
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Kimoto Co Ltd
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  • Application Of Or Painting With Fluid Materials (AREA)
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Description

【0001】
【発明の属する技術分野】
本発明は、合成樹脂板に導電性を付与するための導電性合成樹脂板製造用導電層転写シート、およびそれを用いた導電性合成樹脂板の製造方法に関するものである。
【0002】
【従来の技術】
表面に導電性が付与された合成樹脂板は、帯電防止機能を備えているので、工業用無塵室等の微粉を嫌う室内の壁面、床面の構成部材として利用され、特にマイクロ・エレクトロニクスの分野では、固体回路の製造組立工程での防塵用の容器、遮蔽部材として利用されている。
【0003】
このような合成樹脂板の製造方法に関しては、熱可塑性樹脂と導電性微粉末とからなる塗工液を合成樹脂板に塗布硬化した後、加熱下でプレスして塗膜表面を平滑にする方法が知られている(特開昭59−177813号)。
【0004】
しかしこの様な方法では、導電層が直接外気に晒された状態で保管あるいは型抜き等の二次加工を行うことになるので、合成樹脂板の表面抵抗値が位置によって異なり、品質上のバラツキとして重要な問題となっていた。
【0005】
また、予め離型フィルムに導電層塗膜を塗布乾燥しておき熱圧着の際に合成樹脂板の表面に塗膜を対面させ、合成樹脂板と離型フィルムとをプレス金型間で加熱圧着後、離型フィルムを剥離することで導電層を形成する方法も知られている(特開平6−263899号)。
【0006】
しかし、この方法で合成樹脂板上に導電層を形成する場合、一層で接着性と導電性を兼ね備えなければならず、十分な接着性を保持するためには導電剤の添加量に限界があった。すなわち、必要とする導電性を得ようとして導電剤を添加すると接着性が劣ってしまうといった問題があった。
【0007】
【発明が解決しようとする課題】
本発明は上記問題を解決するためになされたものであり、合成樹脂板に貼合した場合に合成樹脂板表面に均一な導電性を付与することが可能であり、かつ合成樹脂板の色彩を損なうことのない導電性合成樹脂板製造用導電層転写シート、およびそれを用いた導電性合成樹脂板の製造方法を提供することを目的とする。
【0008】
【課題を解決するための手段】
本発明者等は、このような従来の欠点を解決すべく鋭意検討を重ねた。その結果、支持体上に特定の導電層とヒートシール層とを順次積層した導電性合成樹脂板製造用導電層転写シートの積層面と、合成樹脂板を加熱圧着した後支持体を剥がして用いることで、表面が平滑で導電性のバラツキがなく、従来の問題を解決することを見い出した。本発明は係る知見に基づいて完成したものである。
【0009】
即ち、本発明の導電性合成樹脂板製造用導電層転写シートは、支持体の一方の面にバインダー樹脂と金属微粉末、金属酸化物微粉末、導電性カーボンから選ばれる単独或いは2種以上からなる導電剤とを含む導電層と、熱可塑性樹脂からなるヒートシール層を順次積層してなる導電性合成樹脂板製造用導電層転写シートの、前記剥離可能な支持体を剥離した際の前記導電層側の表面抵抗値(JIS−K6911)を、10 5 〜10 8 Ω/□としたことを特徴とするものである。
【0010】
【発明の実施の形態】
以下、本発明を詳述する。
【0011】
図1は、本発明の導電性合成樹脂板製造用導電層転写シートの断面図である。
【0012】
本発明に使用される支持体1は、後述する導電層2に対する剥離性の良好なものが適宜選択される。具体的には、ポリエステル、ポリカーボネート、ポリプロピレン等のプラスチックフィルムが挙げられ、特にポリエステルは溶融点が高く、圧着時に融着しないので剥離性に優れ好ましい。
【0013】
更にこの支持体は、導電性合成樹脂板製造用導電層転写シートを合成樹脂板に熱圧着した後に行う型抜き等の二次加工や、その他の取扱い工程における表面保護フィルムとして機能するもので、使用する前に剥離する。
【0014】
また支持体の厚みとしては、50〜125μmが好ましい。50μm以上としたのは、表面保護フィルムとしての機能を十分に果たすようにするためであり、125μm以下としたのは作業性を低下させないためである。
【0015】
導電層2は、導電剤とバインダー樹脂とからなる層で、合成樹脂板に均一な導電性をもたせるためのものである。
【0016】
導電層に用いるバインダー樹脂としては、ポリカーボネート、ポリエステル、ポリアクリレート、ポリ塩化ビニル、ポリ塩化ビニリデン等の樹脂を単独あるいは2種以上混合して用いることができる。
【0017】
また、導電層に用いる導電剤としては、金属微粉末、金属酸化物微粉末、導電性カーボンから選ばれる単独或いは2種以上からなる導電剤を使用する。金属微粉末、金属酸化物微粉末、導電性カーボンから選ばれる単独或いは2種以上からなる導電剤は、少量で高い導電性を得ることができ、ひいては導電性合成樹脂板製造用導電層転写シートの透明性を維持することができるものである。さらに、透明性を維持することで、合成樹脂板に貼合した際に合成樹脂板の色彩を損ねることがない。
【0018】
金属微粉末、金属酸化物微粉末、導電性カーボンとしては、アルミニウム、亜鉛等の金属微粉末、酸化チタン、酸化亜鉛、酸化錫等の金属酸化物粉末、導電性カーボン等が挙げられるが、酸化錫が透明性という点で好ましく、特に酸化錫にアンチモンをドープしたものが好ましい。これら金属微粉末、金属酸化物微粉末、導電性カーボンは単独あるいは2種以上混合しても良い。またその粒径は、0.2μm以下とすることが好ましい。0.2μm以上であると可視光を散乱してしまい、塗膜の透明性を損ねてしまうからである。
【0019】
金属微粉末、金属酸化物微粉末、導電性カーボンから選ばれる単独或いは2種以上からなる導電剤の添加量としては、樹脂100重量部に対して200〜400重量部とすることが好ましい。添加量が200重量部以下であると十分な導電性を得ることができないからであり、400重量部以上であると塗膜を形成することが困難となるからである。
【0020】
導電層の塗膜の厚さは、0.5〜2.0μmとなるように、かつ表面全体に一様の厚みとなるようにする。0.5μm以上としたのは、所望の表面抵抗値を得るためであり、2.0μm以下としたのは十分な表面抵抗値を得るのと同時に合成樹脂板に貼合した際に合成樹脂板の色彩を損ねないようにするためである。
【0021】
上記のような導電層を形成することで、その表面抵抗値はクリーンルーム等の工業用無塵室の壁面等に好適な105〜108Ω/□の範囲とすることができる。
【0022】
また必要に応じて、分散剤、熱安定剤、紫外線吸収剤、増粘剤等を塗膜の性能を損なわない程度に添加することができる。
【0023】
ヒートシール層3は、合成樹脂板に接着させるための層で熱可塑性樹脂からなる。熱可塑性樹脂としては、後述する合成樹脂板と熱圧着性の良い樹脂であって、具体的には、ポリ塩化ビニル系、ポリ塩化ビニル−酢酸ビニル系、アクリル系樹脂等が使用される。これらの中から、合成樹脂板との剥離強度が、支持体と導電層との剥離強度よりも大きくなるように適宜選択する。
【0024】
ヒートシール層の塗膜の厚さは、2〜20μmとなるように、かつ表面全体に一様の厚みとなるようにする。2μm以上としたのは、2μm以下だと熱圧着時に合成樹脂板とヒートシール層が十分接着できないからであり、20μm以下としたのは、20μm以上にしても、熱圧着効果にこれ以上の向上が見られないからである。
【0025】
また導電層と同様に、分散剤、熱安定剤、紫外線吸収剤等を塗膜の性能を損なわない程度に添加することができる。
【0026】
本発明の導電性合成樹脂板製造用導電層転写シートは、支持体上に先の導電層用材料を特定の溶剤に溶解あるいは分散させ、得られた導電層用塗料をロール法、スプレー法、メイヤーバー法、ナイフエッジ法等で塗布し乾燥させて塗膜を形成し、次に導電層上にヒートシール層用材料を特定の溶剤に溶解あるいは分散させ、得られたヒートシール層用塗料を同様に塗布し乾燥させて塗膜を形成することで得られるものである。
【0027】
次に本発明の導電性合成樹脂板製造用導電層転写シートの使用方法について説明する。
【0028】
上記の要領で得られた導電性合成樹脂板製造用導電層転写シートの塗膜面を、導電性を持たせようとする目的の合成樹脂板に対面させ、導電性合成樹脂板製造用導電層転写シートと合成樹脂板とを加熱状態で圧着させ、塗膜と合成樹脂板を圧着させた後、導電性合成樹脂板製造用導電層転写シートの支持体のみを剥離する。
【0029】
導電性合成樹脂板製造用導電層転写シートを貼合させる合成樹脂板4としては、ポリ塩化ビニル、ポリカーボネート、ポリ(メタ)アクリレート、ABS樹脂、AS樹脂等が挙げられ、その形状としては板材、シート、フィルム等があり、さらにはラミネート構造状のものも用いることが可能である。
【0030】
熱圧着の方法には、プレス金型で押圧するプレス法と、回転ロール間を挿通転送するロールラミネート法等が利用できる。
【0031】
熱圧着時の加熱温度については、ヒートシール層の樹脂が熱可塑性により圧着できる温度であることが必要で、ヒートシール層の樹脂の軟化温度から溶融温度までの範囲となるが、他方、熱圧着の過程で導電層と支持体が剥離不能となる程度に強固に固着されるのは妥当でないから、導電層の樹脂および、支持体の軟化温度以下であることが目安となる。
【0032】
具体的には、合成樹脂板にポリカーボネートを使用する場合は、加熱温度は230℃以下を必要とし、この場合、ヒートシール層の樹脂にポリ塩化ビニル、導電層の樹脂にポリエステル、支持体にポリエチレンテレフタレートを用いる場合は、加熱温度は120〜170℃が適当となる。
【0033】
熱圧着の際の圧力は、樹脂の種類により、また、加熱温度に依存するが、通常4〜100kgf/cm2程度である。
【0034】
このようにして導電性が付与された合成樹脂板は、表面が平滑で均一な導電性を備えたものである。
【0035】
上記に示すように、支持体上に導電層とヒートシール層を積層した導電性合成樹脂板製造用導電層転写シートを用いることで、合成樹脂板に対して色彩を損ねることなく表面が平滑で、均一な導電性を付与することができる。
【0036】
【実施例】
以下、本発明の実施例について説明する。
【0037】
[実施例1]
厚さ50μmのポリエステルフィルム(ルミラーT−60:東レ社)の支持体上に下記組成の導電層用塗布液をバーコーティングにより塗布し乾燥して厚さ0.8μmの導電層を形成した。
【0038】
・導電層用塗布液
ポリエステル系樹脂 1.0重量部
(バイロン103:東洋紡績社)
酸化錫系金属微粉末 2.5重量部
メチルエチルケトン 16.0重量部
アノン 4.0重量部
トルエン 3.5重量部
酢酸ブチル 2.0重量部
【0039】
さらに前記導電層上に下記組成のヒートシール層用塗布液をバーコーティングにより塗布し乾燥して厚さ6μmのヒートシール層を積層し、導電性合成樹脂板製造用導電層転写シートを得た。
【0040】
・ヒートシール層用塗布液
アクリル系樹脂 3.0重量部
(アクリディックA-165:大日本インキ化学工業社)
トルエン 5.0重量部
【0041】
[比較例1]導電層用塗布液を下記組成に変更した以外は実施例1と同様にして導電性合成樹脂板製造用導電層転写シートを得た。
【0042】
・導電層用塗布液
ポリエステル系樹脂 1.0重量部
(バイロン103:東洋紡績社)
酸化錫系金属微粉末 1.0重量部
メチルエチルケトン 6.0重量部
アノン 4.0重量部
トルエン 4.5重量部
酢酸ブチル 2.5重量部
【0043】
[比較例2]導電層用塗布液を下記組成に変更した以外は実施例1と同様にして導電性合成樹脂板製造用導電層転写シートを得た。
【0044】
・導電層用塗布液
ポリエステル系樹脂 1.0重量部
(バイロン103:東洋紡績社)
酸化錫系金属微粉末 5.0重量部
メチルエチルケトン 16.0重量部
アノン 4.0重量部
トルエン 3.0重量部
酢酸ブチル 2.0重量部
【0045】
[比較例3]厚さ50μmのポリエステルフィルム(ルミラーT−60:東レ社)の支持体上に下記組成の導電性ヒートシール層用塗布液をバーコーティングにより塗布し乾燥して厚さ7μmの導電性ヒートシール層を形成し、導電性合成樹脂板製造用導電層転写シートを得た。
【0046】
・導電性ヒートシール層用塗布液
ポリエステル系樹脂 0.5重量部
(バイロン103:東洋紡績社)
酸化錫系金属微粉末 3.0重量部
アクリル系樹脂 7.0重量部
(アクリディックA-165:大日本インキ化学工業社)
メチルエチルケトン 14.0重量部
アノン 3.5重量部
トルエン 3.0重量部
酢酸ブチル 1.5重量部
【0047】
[比較例4]厚さ50μmのポリエステルフィルム(ルミラーT−60:東レ社)の支持体上に下記組成の導電性ヒートシール層用塗布液をバーコーティングにより塗布し乾燥して厚さ7μmの導電性ヒートシール層を形成し、導電性合成樹脂板製造用導電層転写シートを得た。
【0048】
・導電性ヒートシール層用塗布液
ポリエステル系樹脂 2.5重量部
(バイロン103:東洋紡績社)
酸化錫系金属微粉末 1.0重量部
アクリル系樹脂 20.0重量部
(アクリディックA-165:大日本インキ化学工業社)
メチルエチルケトン 14.5重量部
アノン 3.5重量部
トルエン 2.5重量部
酢酸ブチル 1.5重量部
【0049】
そして、実施例1、比較例1〜4において得られた導電性合成樹脂板製造用導電層転写シートの塗布面を合成樹脂板に対面させ、温度:120〜140℃、圧力:5kgf/cm2以上の条件で熱圧着した。なお、合成樹脂板としてはポリカーボネートフィルムを用いた。熱圧着後ポリエステルフィルム支持体を剥離し、導電性が付与された合成樹脂板を得た。しかし、比較例2と、比較例3の導電性合成樹脂板製造用導電層転写シートについては支持体であるポリエステルフィルムを剥離する際にポリエステルフィルムの一部に未接着部分が残り転写不可となった。
【0050】
このようにして得られた導電性が付与された合成樹脂板について、合成樹脂板に対する転着された塗膜の接着性、表面抵抗値、ヘイズ値について測定した。測定方法は、接着性については、導電性合成樹脂板製造用導電層転写シート全体が合成樹脂板に貼合され、かつ平面性の良い場合を良好、未接着部分が生じたものを不良と判断した。表面抵抗値については、JIS−K6911に準拠して測定を行った。ヘイズ値については、JIS−K7105に準拠して測定を行った。
【0051】
その結果を下記に示す。
【0052】
【表1】

Figure 0004194054
【0053】
この結果実施例では、熱圧着後の合成樹脂板に対する接着性が良く、さらに、表面抵抗値が低く導電性が十分であることがわかる。また、ヘイズ値も低く、透明性に優れていることがわかる。
【0054】
一方、比較例1は、金属微粉末の添加量が少ないため表面抵抗値が高くなり、所望の導電性を得ることができなかった。比較例2は、金属微粉末の添加量が多いために、十分な塗膜強度が得られず合成樹脂板に転写不能となってしまった。比較例3については、金属微粉末の添加量が少ないため、表面抵抗値が高くなり、所望の導電性を得ることができなかった。比較例4については、十分な塗膜強度があり、熱圧着で合成樹脂板に接着が可能であったが、金属微粉末の添加量が少ないため表面抵抗値が高くなり、所望の導電性を得ることができず、さらにヘイズ値が高く合成樹脂板の色彩を損ねてしまった。
【0055】
【発明の効果】
本発明の導電性合成樹脂板製造用導電層転写シートは、剥離可能な支持体に導電層とヒートシール層を順次積層したもので、合成樹脂板表面に導電性合成樹脂板製造用導電層転写シートの塗膜面を接して圧着するものであるから、合成樹脂板表面に転写された導電層塗膜の厚みが表面全域で均一であり、かつその表面が透明で平滑性に優れると共に表面抵抗値が一様に低いという優れた導電性が得られる。
【0056】
また支持体は、導電性塗膜に表面平滑性を付与するフィルムとして、また熱圧着後には導電塗膜保護フィルムとして共用でき、導電性合成樹脂板製造用導電層転写シートの製造、取扱いの際の導電性塗膜表面の汚染、欠損を防止できる。
【図面の簡単な説明】
【図1】本発明の導電性合成樹脂板製造用導電層転写シートの一実施例を示す断面図。
【図2】本発明の導電性合成樹脂板製造用導電層転写シートの一使用例を示す断面図。
【符号の説明】
1・・・支持体
2・・・導電層
3・・・ヒートシール層
4・・・合成樹脂板[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a conductive layer transfer sheet for producing a conductive synthetic resin plate for imparting conductivity to a synthetic resin plate , and a method for producing a conductive synthetic resin plate using the same .
[0002]
[Prior art]
Synthetic resin plates with electrical conductivity on the surface have an antistatic function, so they are used as components for indoor walls and floors that do not like fine dust such as industrial dust-free rooms. In the field, it is used as a dust-proof container and a shielding member in the manufacturing and assembling process of a solid circuit.
[0003]
Regarding a method for producing such a synthetic resin plate, a method of applying a coating liquid composed of a thermoplastic resin and conductive fine powder to a synthetic resin plate and curing it, and then pressing it under heating to smooth the surface of the coating film Is known (Japanese Patent Laid-Open No. 59-177813).
[0004]
However, in such a method, secondary processing such as storage or die-cutting is performed in a state where the conductive layer is directly exposed to the outside air, so the surface resistance value of the synthetic resin plate varies depending on the position, and the quality varies. As an important issue.
[0005]
In addition, the conductive layer coating is applied to the release film and dried in advance, and the coating is placed on the surface of the synthetic resin plate at the time of thermocompression bonding, and the synthetic resin plate and the release film are thermocompression bonded between the press dies. Thereafter, a method of forming a conductive layer by peeling a release film is also known (Japanese Patent Laid-Open No. 6-263899).
[0006]
However, when a conductive layer is formed on a synthetic resin plate by this method, one layer must have both adhesion and conductivity, and there is a limit to the amount of conductive agent added in order to maintain sufficient adhesion. It was. That is, there is a problem that the adhesiveness is inferior when a conductive agent is added to obtain the required conductivity.
[0007]
[Problems to be solved by the invention]
The present invention has been made to solve the above-mentioned problems, and when bonded to a synthetic resin plate, it is possible to impart uniform conductivity to the surface of the synthetic resin plate, and to change the color of the synthetic resin plate. It is an object of the present invention to provide a conductive layer transfer sheet for producing a conductive synthetic resin plate that is not damaged , and a method for producing a conductive synthetic resin plate using the same.
[0008]
[Means for Solving the Problems]
The inventors of the present invention have made extensive studies in order to solve such conventional drawbacks. As a result, the laminated surface of the conductive layer transfer sheet for producing a conductive synthetic resin plate in which a specific conductive layer and a heat seal layer are sequentially laminated on the support, and the support is peeled off after the synthetic resin plate is thermocompression-bonded. Thus, the present inventors have found that the surface is smooth and there is no variation in conductivity, and that the conventional problems are solved. The present invention has been completed based on such knowledge.
[0009]
That is, the conductive layer transfer sheet for producing a conductive synthetic resin plate of the present invention is composed of one or more selected from binder resin, metal fine powder, metal oxide fine powder, and conductive carbon on one surface of the support. When the peelable support is peeled off, the conductive layer transfer sheet for producing a conductive synthetic resin plate, which is formed by sequentially laminating a conductive layer containing a conductive agent and a heat seal layer made of a thermoplastic resin, The surface resistance value (JIS-K6911) on the layer side is 10 5 to 10 8 Ω / □ .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is described in detail below.
[0011]
FIG. 1 is a sectional view of a conductive layer transfer sheet for producing a conductive synthetic resin plate of the present invention.
[0012]
As the support 1 used in the present invention, one having good peelability for the conductive layer 2 described later is appropriately selected. Specific examples include plastic films such as polyester, polycarbonate, and polypropylene. Particularly, polyester is preferable because it has a high melting point and does not melt at the time of pressure bonding, and thus has excellent peelability.
[0013]
Furthermore, this support body functions as a surface protective film in secondary processing such as die cutting performed after thermocompression bonding the conductive layer transfer sheet for conductive synthetic resin plate production to the synthetic resin plate, and other handling steps, Peel before use.
[0014]
Moreover, as thickness of a support body, 50-125 micrometers is preferable. The reason why the thickness is set to 50 μm or more is to sufficiently fulfill the function as a surface protective film, and the reason why the thickness is set to 125 μm or less is not to reduce workability.
[0015]
The conductive layer 2 is a layer made of a conductive agent and a binder resin, and is used to give uniform conductivity to the synthetic resin plate.
[0016]
As the binder resin used for the conductive layer, resins such as polycarbonate, polyester, polyacrylate, polyvinyl chloride, and polyvinylidene chloride can be used alone or in admixture of two or more.
[0017]
Moreover, as a conductive agent used for the conductive layer, a conductive agent selected from metal fine powder, metal oxide fine powder and conductive carbon is used alone or two or more kinds are used. A conductive agent consisting of one or more selected from metal fine powder, metal oxide fine powder and conductive carbon can obtain high conductivity in a small amount, and as a result , a conductive layer transfer sheet for producing a conductive synthetic resin plate. The transparency can be maintained. Furthermore, by maintaining transparency, the color of the synthetic resin plate is not impaired when it is bonded to the synthetic resin plate.
[0018]
Examples of the metal fine powder, metal oxide fine powder and conductive carbon include metal fine powder such as aluminum and zinc, metal oxide powder such as titanium oxide, zinc oxide and tin oxide, and conductive carbon. Tin is preferable in terms of transparency, and tin oxide doped with antimony is particularly preferable. These metal fine powder, metal oxide fine powder, and conductive carbon may be used alone or in combination of two or more. The particle size is preferably 0.2 μm or less. It is because visible light will be scattered when it is 0.2 micrometers or more, and the transparency of a coating film will be impaired.
[0019]
The addition amount of the conductive agent consisting of metal fine powder, metal oxide fine powder or conductive carbon alone or two or more kinds is preferably 200 to 400 parts by weight with respect to 100 parts by weight of the resin. This is because sufficient conductivity cannot be obtained when the addition amount is 200 parts by weight or less, and it is difficult to form a coating film when the addition amount is 400 parts by weight or more.
[0020]
The thickness of the coating film of the conductive layer is set to 0.5 to 2.0 μm, and the thickness is uniform over the entire surface. The reason why the thickness is 0.5 μm or more is to obtain a desired surface resistance value, and that the thickness is 2.0 μm or less is that when a sufficient surface resistance value is obtained and simultaneously bonded to the synthetic resin plate, This is so as not to damage the color of the.
[0021]
By forming the conductive layer as described above, the surface resistance value can be in the range of 10 5 to 10 8 Ω / □ suitable for the wall surface of an industrial dust-free room such as a clean room.
[0022]
Moreover, a dispersing agent, a heat stabilizer, a ultraviolet absorber, a thickener, etc. can be added as needed so that the performance of a coating film may not be impaired.
[0023]
The heat seal layer 3 is a layer for bonding to a synthetic resin plate and is made of a thermoplastic resin. The thermoplastic resin is a resin having a good thermocompression bonding property with a synthetic resin plate to be described later, and specifically, a polyvinyl chloride, polyvinyl chloride-vinyl acetate, acrylic resin, or the like is used. Among these, the peel strength with respect to the synthetic resin plate is appropriately selected so as to be greater than the peel strength between the support and the conductive layer.
[0024]
The thickness of the coating film of the heat seal layer is set to 2 to 20 μm, and the entire surface has a uniform thickness. The reason why it is 2 μm or more is that if it is 2 μm or less, the synthetic resin plate and the heat seal layer cannot be sufficiently bonded at the time of thermocompression bonding. The reason why it is 20 μm or less is that the thermocompression bonding effect is further improved even if it is 20 μm or more. This is because you cannot see.
[0025]
Similarly to the conductive layer, a dispersant, a heat stabilizer, an ultraviolet absorber and the like can be added to such an extent that the performance of the coating film is not impaired.
[0026]
The conductive layer transfer sheet for producing the conductive synthetic resin plate of the present invention is obtained by dissolving or dispersing the above conductive layer material in a specific solvent on a support, and using the obtained conductive layer coating material by a roll method, a spray method, A coating film is formed by applying and drying by the Mayer bar method, knife edge method, etc., and then the heat seal layer material is dissolved or dispersed in a specific solvent on the conductive layer, and the resulting heat seal layer coating is obtained. Similarly, it is obtained by applying and drying to form a coating film.
[0027]
Next, a method of using the conductive layer transfer sheet for producing the conductive synthetic resin plate of the present invention will be described.
[0028]
The conductive layer transfer sheet for producing a conductive synthetic resin plate obtained as described above is made to face the synthetic resin plate intended to have conductivity, and the conductive layer for producing the conductive synthetic resin plate. After the transfer sheet and the synthetic resin plate are pressure-bonded in a heated state and the coating film and the synthetic resin plate are pressure-bonded, only the support of the conductive layer transfer sheet for producing the conductive synthetic resin plate is peeled off.
[0029]
Examples of the synthetic resin plate 4 to which the conductive layer transfer sheet for producing the conductive synthetic resin plate is bonded include polyvinyl chloride, polycarbonate, poly (meth) acrylate, ABS resin, AS resin, and the shape thereof is a plate material, There are a sheet, a film, and the like, and a laminate structure can also be used.
[0030]
As the thermocompression bonding method, a pressing method in which pressing is performed with a press die, a roll laminating method in which the rotating roll is inserted and transferred, and the like can be used.
[0031]
The heating temperature at the time of thermocompression bonding needs to be a temperature at which the resin of the heat seal layer can be pressure-bonded due to thermoplasticity, and is in the range from the softening temperature to the melting temperature of the resin of the heat seal layer. In this process, it is not appropriate that the conductive layer and the support are firmly fixed to such an extent that they cannot be peeled off. Therefore, it is a guideline that the temperature is equal to or lower than the softening temperature of the resin of the conductive layer and the support.
[0032]
Specifically, when polycarbonate is used for the synthetic resin plate, the heating temperature needs to be 230 ° C. or lower. In this case, the heat seal layer resin is polyvinyl chloride, the conductive layer resin is polyester, and the support is polyethylene. When terephthalate is used, the heating temperature is suitably 120 to 170 ° C.
[0033]
The pressure at the time of thermocompression bonding is usually about 4 to 100 kgf / cm 2 depending on the type of resin and depending on the heating temperature.
[0034]
Thus, the synthetic resin board | substrate to which electroconductivity was provided is a thing with the smooth surface and uniform electroconductivity.
[0035]
As shown above, by using a conductive layer transfer sheet for manufacturing a conductive synthetic resin plate in which a conductive layer and a heat seal layer are laminated on a support, the surface is smooth without impairing the color of the synthetic resin plate. , Uniform conductivity can be imparted.
[0036]
【Example】
Examples of the present invention will be described below.
[0037]
[Example 1]
A conductive layer coating solution having the following composition was applied by bar coating on a support of a 50 μm thick polyester film (Lumirror T-60: Toray Industries, Inc.) and dried to form a 0.8 μm thick conductive layer.
[0038]
・ Coating layer polyester resin 1.0 parts by weight (Byron 103: Toyobo Co., Ltd.)
Tin oxide metal fine powder 2.5 parts by weight Methyl ethyl ketone 16.0 parts by weight Anone 4.0 parts by weight Toluene 3.5 parts by weight Butyl acetate 2.0 parts by weight
Further, a heat seal layer coating solution having the following composition was applied onto the conductive layer by bar coating and dried to laminate a 6 μm thick heat seal layer to obtain a conductive layer transfer sheet for producing a conductive synthetic resin plate .
[0040]
・ 3.0 parts by weight of acrylic resin for heat seal layer (Acridic A-165: Dainippon Ink & Chemicals, Inc.)
Toluene 5.0 parts by weight
[Comparative Example 1] A conductive layer transfer sheet for producing a conductive synthetic resin plate was obtained in the same manner as in Example 1 except that the conductive layer coating solution was changed to the following composition.
[0042]
・ Coating layer polyester resin 1.0 parts by weight (Byron 103: Toyobo Co., Ltd.)
Tin oxide metal fine powder 1.0 part by weight Methyl ethyl ketone 6.0 parts by weight Anone 4.0 parts by weight Toluene 4.5 parts by weight Butyl acetate 2.5 parts by weight
Comparative Example 2 A conductive layer transfer sheet for producing a conductive synthetic resin plate was obtained in the same manner as in Example 1 except that the conductive layer coating solution was changed to the following composition.
[0044]
・ Coating layer polyester resin 1.0 parts by weight (Byron 103: Toyobo Co., Ltd.)
Tin oxide metal fine powder 5.0 parts by weight Methyl ethyl ketone 16.0 parts by weight Anone 4.0 parts by weight Toluene 3.0 parts by weight Butyl acetate 2.0 parts by weight
[Comparative Example 3] A conductive heat seal layer coating solution having the following composition was applied onto a support of a 50 μm thick polyester film (Lumirror T-60: Toray Industries, Inc.) by bar coating and dried to conduct a 7 μm thick conductive film. A conductive heat seal layer was formed to obtain a conductive layer transfer sheet for producing a conductive synthetic resin plate .
[0046]
・ 0.5 parts by weight of coating liquid polyester resin for conductive heat seal layer (Byron 103: Toyobo Co., Ltd.)
Tin oxide metal fine powder 3.0 parts by weight Acrylic resin 7.0 parts by weight (Acridic A-165: Dainippon Ink and Chemicals)
Methyl ethyl ketone 14.0 parts by weight Anone 3.5 parts by weight Toluene 3.0 parts by weight Butyl acetate 1.5 parts by weight
[Comparative Example 4] A conductive heat seal layer coating solution having the following composition was applied by bar coating on a support of a 50 μm thick polyester film (Lumirror T-60: Toray Industries, Inc.) and dried to conduct a 7 μm thick conductive film. A conductive heat seal layer was formed to obtain a conductive layer transfer sheet for producing a conductive synthetic resin plate .
[0048]
・ 2.5 parts by weight of coating liquid polyester resin for conductive heat seal layer (Byron 103: Toyobo Co., Ltd.)
Tin oxide metal fine powder 1.0 part by weight Acrylic resin 20.0 parts by weight (Acridic A-165: Dainippon Ink & Chemicals, Inc.)
Methyl ethyl ketone 14.5 parts by weight Anone 3.5 parts by weight Toluene 2.5 parts by weight Butyl acetate 1.5 parts by weight
And the application surface of the conductive layer transfer sheet for producing a conductive synthetic resin plate obtained in Example 1 and Comparative Examples 1 to 4 is made to face the synthetic resin plate, temperature: 120 to 140 ° C., pressure: 5 kgf / cm 2. Thermocompression bonding was performed under the above conditions. A polycarbonate film was used as the synthetic resin plate. After thermocompression bonding, the polyester film support was peeled off to obtain a synthetic resin plate imparted with conductivity. However, with respect to the conductive layer transfer sheet for producing the conductive synthetic resin plate of Comparative Example 2 and Comparative Example 3, when the polyester film as the support is peeled off, an unadhered portion remains on a part of the polyester film and transfer is impossible. It was.
[0050]
The thus-obtained synthetic resin plate provided with conductivity was measured for the adhesiveness, surface resistance value, and haze value of the coated film transferred to the synthetic resin plate. As for the measurement method, regarding the adhesiveness, the conductive layer transfer sheet for producing a conductive synthetic resin plate is entirely bonded to the synthetic resin plate and has good flatness. did. The surface resistance value was measured according to JIS-K6911. About haze value, it measured based on JIS-K7105.
[0051]
The results are shown below.
[0052]
[Table 1]
Figure 0004194054
[0053]
As a result, in the examples, it can be seen that the adhesiveness to the synthetic resin plate after thermocompression bonding is good, the surface resistance value is low, and the conductivity is sufficient. It can also be seen that the haze value is low and the transparency is excellent.
[0054]
On the other hand, in Comparative Example 1, since the amount of the metal fine powder added was small, the surface resistance value was high, and the desired conductivity could not be obtained. In Comparative Example 2, since the amount of the metal fine powder added was large, sufficient film strength could not be obtained and transfer to the synthetic resin plate was impossible. In Comparative Example 3, since the addition amount of the metal fine powder was small, the surface resistance value was high, and the desired conductivity could not be obtained. For Comparative Example 4, the coating film strength was sufficient, and it was possible to adhere to the synthetic resin plate by thermocompression bonding, but the surface resistance value was increased because the amount of metal fine powder added was small, and the desired conductivity was achieved. In addition, the haze value was high and the color of the synthetic resin plate was damaged.
[0055]
【The invention's effect】
Conductive synthetic resin plate manufacturing conductive layer transfer sheet of the present invention, strippable support obtained by sequentially laminating the conductive layer and the heat seal layer, a conductive synthetic resin sheet manufacturing conductive layer transferred to the synthetic resin plate surface Since the coating surface of the sheet is contacted and pressure-bonded, the thickness of the conductive layer coating film transferred to the surface of the synthetic resin plate is uniform over the entire surface, and the surface is transparent and excellent in smoothness and surface resistance. Excellent conductivity is obtained with a uniformly low value.
[0056]
The support may, as a film to impart surface smoothness in the conductive coating film, also after thermocompression bonding can be shared as a conductive paint film-protecting film, a conductive synthetic resin plate prepared for producing conductive layer transfer sheet during handling Contamination and loss of the surface of the conductive coating can be prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing one embodiment of a conductive layer transfer sheet for producing a conductive synthetic resin plate of the present invention.
FIG. 2 is a cross-sectional view showing an example of use of the conductive layer transfer sheet for producing a conductive synthetic resin plate of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Support body 2 ... Conductive layer 3 ... Heat seal layer 4 ... Synthetic resin board

Claims (7)

剥離可能な支持体上に、金属微粉末、金属酸化物微粉末、導電性カーボンから選ばれる単独或いは2種以上からなる導電剤とバインダー樹脂とからなる導電層と、熱可塑性樹脂からなるヒートシール層を順次積層してなる導電性合成樹脂板製造用導電層転写シートの、前記剥離可能な支持体を剥離した際の前記導電層側の表面抵抗値(JIS−K6911)が、105〜108Ω/□であることを特徴とする導電性合成樹脂板製造用導電層転写シート。On a peelable support, a conductive layer made of a single or two or more kinds of conductive agents selected from metal fine powder, metal oxide fine powder, and conductive carbon and a binder resin, and a heat seal made of a thermoplastic resin The surface resistance value (JIS-K6911) on the conductive layer side of the conductive layer transfer sheet for producing a conductive synthetic resin plate obtained by sequentially laminating the layers when the peelable support is peeled is 10 5 to 10 A conductive layer transfer sheet for producing a conductive synthetic resin plate, characterized in that it is 8 Ω / □. 前記剥離可能な支持体を剥離した際に、前記導電層が最表面となることを特徴とする請求項1記載の導電性合成樹脂板製造用導電層転写シート。  2. The conductive layer transfer sheet for producing a conductive synthetic resin plate according to claim 1, wherein when the peelable support is peeled, the conductive layer becomes the outermost surface. 前記導電層において、前記導電剤の添加量がバインダー樹脂100重量部に対して、200〜400重量部であることを特徴とする請求項1又は2記載の導電性合成樹脂板製造用導電層転写シート。  3. The conductive layer transfer for producing a conductive synthetic resin plate according to claim 1, wherein an addition amount of the conductive agent is 200 to 400 parts by weight with respect to 100 parts by weight of the binder resin in the conductive layer. Sheet. 前記導電層の厚みが0.5〜2.0μmであることを特徴とする請求項1から3何れか1項記載の導電性合成樹脂板製造用導電層転写シート。  4. The conductive layer transfer sheet for producing a conductive synthetic resin plate according to claim 1, wherein the conductive layer has a thickness of 0.5 to 2.0 μm. 前記導電剤の粒径が0.2μm以下であることを特徴とする請求項1から4何れか1項記載の導電性合成樹脂板製造用導電層転写シート。  5. The conductive layer transfer sheet for producing a conductive synthetic resin plate according to claim 1, wherein the conductive agent has a particle size of 0.2 μm or less. 前記剥離可能な支持体がポリエステルフィルムであることを特徴とする請求項1から5何れか1項記載の導電性合成樹脂板製造用導電層転写シート。The conductive layer transfer sheet for producing a conductive synthetic resin plate according to any one of claims 1 to 5, wherein the peelable support is a polyester film. 請求項1から何れか1項記載の導電性合成樹脂板製造用導電層転写シートと合成樹脂板とを、導電性合成樹脂板製造用導電層転写シートのヒートシール層を合成樹脂板に対面させるようにして熱圧着した後、導電性合成樹脂板製造用導電層転写シートの剥離可能な支持体を剥離することを特徴とする導電性合成樹脂板の製造方法。The conductive layer transfer sheet for producing a conductive synthetic resin plate according to any one of claims 1 to 6 and the synthetic resin plate, and the heat seal layer of the conductive layer transfer sheet for producing a conductive synthetic resin plate facing the synthetic resin plate. A method for producing a conductive synthetic resin plate, comprising: peeling off a peelable support of a conductive layer transfer sheet for producing a conductive synthetic resin plate after thermocompression bonding.
JP05683796A 1996-02-20 1996-02-20 Conductive layer transfer sheet for producing conductive synthetic resin plate, and method for producing conductive synthetic resin plate using the same Expired - Fee Related JP4194054B2 (en)

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