JP2004206348A

JP2004206348A - Information recording medium and its manufacturing method

Info

Publication number: JP2004206348A
Application number: JP2002373788A
Authority: JP
Inventors: Shotei Cho; 松弟張; Toshifumi Imai; 敏文今井
Original assignee: Toppan Printing Co Ltd
Current assignee: Toppan Inc
Priority date: 2002-12-25
Filing date: 2002-12-25
Publication date: 2004-07-22
Anticipated expiration: 2022-12-25
Also published as: JP4085803B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording medium in which durability, heat resistance, chemical resistance, embossing suitability, adhesion of printing ink, magnetic stripe embedding work suitability and suitability of laser printing, etc., are improved compared to a conventional case and the smoothness and hiding property of the embedded part of a magnetic stripe especially are excellent, and to provide its manufacturing method. <P>SOLUTION: For the information recording medium, three base materials of a first surface base material which is the base material of thermoplastic polymer resin, a center core and a second surface base material are laminated while the order relation is in the order, relatively. For the first and second surface base materials, a crystalline thermoplastic polymer resin base material for which crystalline thermoplastic polymer resin is biaxially stretched is used. On both or one of the surface base materials, an amorphous thermosetting urethane polymer resin layer is formed on a surface away from the center core. It is preferable that the directions of the orientations of the crystalline thermoplastic polymer resin base material of the respective first and second surface base materials match with each other. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、キャッシュカード、クレジットカード、ＩＤカード（身分証明書）、運転免許証、メンバーズカード、プリペイドカード、等に代表されるカード類、あるいは、タグ類（一般には、タグ、トークン、又は、トランスポンダー、等の色々な呼称がある）と称される情報記録媒体であって、特に高耐熱性、高耐久性、エンボス加工適性、又は、レーザ印字適性、等に優れ、あるいは環境にも優しい情報記録媒体とその製造方法に関するものであり、好適な例として（外部端子を介した接触型の通信機能を備えた）接触型ＩＣカード、とりわけ（カードに設けられたアンテナ又はコイルを介した非接触型の通信機能を備えた）非接触ＩＣカードとか（前記の接触型通信と非接触型通信の両機能を備えた）複合ＩＣカード、への応用が挙げられる。
【０００２】
【従来の技術】
従来から、キャッシュカードやクレジットカード、ＩＤカード等の情報記録媒体が広く利用されており、その素材としては主にポリ塩化ビニル（以下では単にＰＶＣと称する）や塩化ビニル・酢酸ビニル共重合体が用いられており、特にポリ塩化ビニルが一般的である。
ポリ塩化ビニル樹脂は物理的な機械特性や文字部のエンボス適性などが優れ、素材のコストが安いことから、カードなどの情報記録媒体の素材として広く用いられている。
【０００３】
ところで、近年情報記録媒体のＩＣ化につれ、情報記録媒体の特性に関し、高機能化が期待されている。
特に高耐久性、高耐熱性及び環境に優しい情報記録媒体が求められている。
しかし、従来情報記録媒体の基材であるポリ塩化ビニル樹脂または塩化ビニル・酢酸ビニル共重合体樹脂は耐熱性が低く、保管温度が８０℃以上になると、記録媒体が変形することがある。
また、ポリ塩化ビニル樹脂は使用後廃棄される際、特に焼却時の塩化水素ガスを発生し、焼却炉を傷めて寿命を縮める。また焼却温度によりますが、焼却の際にダイオキシンが生じる恐れもあると言われている。
【０００４】
よって、ポリ塩化ビニル樹脂の代替樹脂として、ポリエチレン樹脂、ポリプロピレン樹脂、ポリエステル樹脂、ポリカーボネート樹脂、ポリアクリル樹脂等のハロゲンを含まない熱可塑性樹脂が提案されている。
しかし、これらの樹脂の物性がポリ塩化ビニル樹脂とはかなり異なる為、カード等の情報記録媒体の素材として使用するには、新たな樹脂改質等を行う必要がある。
【０００５】
そこで、ここ数年は非晶性ポリエステル樹脂の１種であるＰＥＴＧが、ポリ塩化ビニルと近い物性を持つことから、注目され使用されるようになってきた。
［尚、「ＰＥＴＧ」は、イーストマン・ケミカル社製のポリエステル樹脂の商標である。エチレングリコールとテレフタル酸及びシクロヘキサンジメタノールの脱水縮合反応で得られると云われている。］
また、高耐熱性（車室内の高温に耐える等）の要望に応えるため、ＰＥＴＧとポリカボネート（以下では単にＰＣと略称する）とのアロイ樹脂が開発され、カード用として使われている。
しかしながら、ＰＥＴＧは一般に耐熱温度が低く、またＰＥＴＧとＰＣとのアロイ樹脂の場合はカードのエンボス加工（文字など）への適応性が低く、例えば、エンボス加工によって大きなカールが生じてしまうといった問題を抱えている。
また、ＰＥＴＧ及びＰＣは、有機溶剤により溶解または膨潤されやすく、情報記録媒体とする製造過程での印刷または加熱・加圧等の加工により、基材が劣化して本来備えていた耐久性が低下しまうことがある。
【０００６】
そのため、情報記録媒体の層構成において、カードの表裏側の基材としてポリエチレンテレフタレート（以下では単にＰＥＴと称する）を二軸延伸したものを用いる技術が開発されている。
しかし、ＰＥＴの基材はその表面適性につき、情報記録媒体用の従来の基材とは異なって、印刷インキの密着性（なじみ易さ）が低かったり、エンボス加工の際の媒体表面に割れを生じたり、磁気ストライプを表面基材に埋め込む場合の加工の困難さ、あるいは、レーザー印字の際の印字エネルギーによる文字縁部の膨れ、等の数多くの解決しなければならない問題を抱えている。
従来これらは、何れも、カード等の情報記録媒体の素材としては、情報記録媒体の各種な仕様に必ずしも巧く対応できる好適な素材、と云うわけではなかった。
【０００７】
【発明が解決しようとする課題】
本発明は前記従来の技術の問題点に鑑みてなされたものであって、従来の技術と比べて、耐久性、耐熱性、耐薬品性、エンボス加工適性（エンボスの容易性、低カール性、耐割れ性）、印刷インキの密着性（なじみ易さ）、又は、レーザ印字の適性などは、同等か又はそれ以上に改善されたものとすることができ、特に、磁気ストライプ・テープの埋め込み加工の容易さや埋設した辺りの情報記録媒体の外側表面の平坦さ（段差が無いか又は段差が実質判り難い）に優れており、また、特に、その磁気ストライプ・テープを隠蔽する隠蔽層などを形成する際の溶剤に侵され難く（溶剤への耐久性が高く隠蔽層の隠蔽性への悪影響が出難い）、埋設した磁気ストライプを巧く隠蔽できること、これらを満たす情報記録媒体とそ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】
すなわち、請求項１に記載の発明は、熱可塑性高分子樹脂を用いた基材である第一の表面基材、熱可塑性高分子樹脂を用いた基材であるセンターコア、及び、熱可塑性高分子樹脂を用いた第二の表面基材の、少なくともこの３つの基材の位置の順序関係が、相対的にこの順に配されるように積層してある情報記録媒体であって、
前記の第一の表面基材および第二の表面基材は、それぞれ、結晶性の熱可塑性高分子樹脂が二軸延伸処理を施された基材である結晶性熱可塑性高分子樹脂基材を用いてあって、
これら表面基材の両方か又は片方のいずれかにつき、前記センターコアから遠い側の面に、非晶性の高分子樹脂の熱硬化型ポリウレタンを用いた層である非晶性熱硬化型ウレタン高分子樹脂層が形成されていること、を特徴とする情報記録媒体を提供するものである。
【０００９】
請求項２に記載の発明は、前記第一の表面基材の結晶性熱可塑性高分子樹脂基材の配向の方向と、前記第二表面基材の結晶性熱可塑性高分子樹脂基材の配向の方向とが、一致していること、を特徴とする請求項１に記載の情報記録媒体を提供するものである。
【００１０】
請求項３に記載の発明は、前記の第一の表面基材と第二の表面基材は、いずれも、前記結晶性熱可塑性高分子樹脂基材は、二軸延伸されたポリエチレンテレフタレートを用いてあり、
しかも、前記の第一の表面基材と第二の表面基材のうち、前記非晶性熱硬化型高分子樹脂層が形成されてある表面基材については、その結晶性熱可塑性高分子樹脂基材の厚さが、その非晶性熱硬化型高分子樹脂層の厚さよりも厚いこと、特徴とする請求項１または請求項２のいずれかに記載の情報記録媒体を提供するものである。
【００１１】
請求項４に記載の発明は、前記の非晶性熱硬化型ウレタン高分子樹脂層が、末端にＯＨ官能基を有するポリマーと、二つ以上のＮＣＯ官能基を有する架橋剤のイソシアナート化合物からなること、を特徴とする請求項１乃至３のいずれかに記載の情報記録媒体を提供するものである。
【００１２】
請求項５に記載の発明は、前記の非晶性熱硬化型ウレタン高分子樹脂層に、少なくとも磁気ストライプが設けてあり、その上に該磁気ストライプを隠蔽するように隠蔽層が設けてあること、を特徴とする前記請求項１乃至４のいずれかに記載の情報記録媒体を提供するものである。
【００１３】
請求項６に記載の発明は、前記の第一の表面基材とセンターコアとの間、及び、前記のセンターコアと第二の表面基材との間に、接着層が形成してあること、を特徴とする請求項１乃至５のいずれかに記載の情報記録媒体を提供するものである。
尚、接着層の材料は必ずしも限定しないが、好ましい代表例としては非晶性熱可塑性高分子樹脂が挙げられる（性能面から好ましい）。
【００１４】
請求項７に記載の発明は、前記センターコアは、少なくとも、非接触通信用の機能を有するＩＣチップ、及び、該ＩＣチップと組合されて非接触通信を行う為のアンテナ、を備えた非接触ＩＣモジュールを有しており、
該非接触ＩＣモジュールの全部か又は一部が、少なくとも非晶性の熱可塑性高分子樹脂の層である非晶性熱可塑性高分子樹脂層によって両側から挟み込まれた構造をなしていること、を特徴とする請求項１乃至６のいずれかに記載の情報記録媒体を提供するものである。
【００１５】
請求項８に記載の発明は、前記の非晶性熱硬化型ウレタン高分子樹脂層が、厚さ２〜５０μｍで形成されていること、を特徴とする請求項１乃至７のいずれかに記載の情報記録媒体を提供するものである。
【００１６】
請求項９に記載の発明は、熱可塑性高分子樹脂を用いた基材である第一の表面基材、熱可塑性高分子樹脂を用いた基材であるセンターコア、及び、熱可塑性高分子樹脂を用いた第二の表面基材の、少なくともこの３つの基材の位置の順序関係が、相対的にこの順に配されるように積層することにより情報記録媒体を製造する方法であって、
前記の第一の表面基材および第二の表面基材に、それぞれ、結晶性の熱可塑性高分子樹脂が二軸延伸された基材である結晶性熱可塑性高分子樹脂基材を使用し、
これら表面基材の両方か又は片方のいずれかにつき、前記センターコアから遠い側の面に、非晶性の高分子樹脂の熱硬化型ポリウレタンを用いた層である非晶性熱硬化型ウレタン高分子樹脂層を形成する工程を経ること、を特徴とする情報記録媒体の製造方法を提供するものである。
【００１７】
請求項１０に記載の発明は、前記少なくとも３つの基材を積層する場合に、前記第一の表面基材の結晶性熱可塑性高分子樹脂基材の配向の方向と、前記第二表面基材の結晶性熱可塑性高分子樹脂基材の配向の方向とを、一致させるること、を特徴とする請求項９に記載の情報記録媒体の製造方法を提供するものである。
【００１８】
請求項１１に記載の発明は、前記の非晶性熱硬化型ウレタン高分子樹脂層を形成する工程は、
末端にＯＨ官能基を有するポリマーの溶解液と、二つ以上のＮＣＯ官能基を有するイソシアナート化合物の架橋剤とを用いてなる混合液を、前記表面基材に直接に塗布するか、又は、
前記基材とは別の基材である中間基材の表面に前記の混合液を一旦塗布し、非晶性熱硬化型ウレタン樹脂を予め層状に形成した後に、該層状の非晶性熱硬化型ウレタン樹脂を前記表面基材に転写すること、
これらのいずれかによって前記の非晶性熱硬化型ウレタン高分子樹脂層を形成すること、を特徴とする請求項９又は１０のいずれかに記載の情報記録媒体の製造方法を提供するものである。
【００１９】
請求項１２に記載の発明は、前記の第一の表面基材、センターコア、及び、第二の表面基材の３つの基材の少なくともいずれかに、隣り合う他の基材と面する側に加熱により接着性を呈する高分子樹脂を用いた接着層を設け、
少なくとも該３つの基材を重ね合わせた状態で、熱と圧力を共にかける工程を経ることにより前記積層を行うこと、を特徴とする請求項９乃至１１のいずれかに記載の情報記録媒体の製造方法を提供するものである。
尚、接着層の材料については、請求項６の発明の場合と同様である。
【００２０】
請求項１３に記載の発明は、熱可塑性高分子樹脂を用いた基材である第一の表面基材、熱可塑性高分子樹脂を用いた基材であるセンターコア、及び、熱可塑性高分子樹脂を用いた第二の表面基材の、少なくともこの３つの基材の位置の順序関係が、相対的にこの順に配されるように積層することにより情報記録媒体を製造する方法であって、
前記の第一の表面基材および第二の表面基材に、それぞれ、結晶性の熱可塑性高分子樹脂が二軸延伸された基材である結晶性熱可塑性高分子樹脂基材を使用し、
前記の非晶性熱硬化型ウレタン高分子樹脂層上に、少なくとも磁気ストライプを配置したうえ、少なくとも該３つの基材を重ね合わせた状態で、熱と圧力を共にかける工程を経ることにより前記積層を行うことによって、最も外側の表面の面一化を図り、
しかる後に、少なくとも前記磁気ストライプが設けてある表面に、該磁気ストライプを隠蔽する隠蔽層を設けること、
を特徴とする請求項９乃至１２のいずれかに記載の情報記録媒体の製造方法を提供するものである。
【００２１】
【発明の実施の形態】
以下、図面を参照し、本発明を詳細に説明する。
図１は本発明の実施例に係わる情報記録媒体１０の構成を示す概念断面図である。
図２は本発明の第一の表面基材と第二の表面基材の結晶性高分子層の配向方向を揃える方法を示す概念図である。尚、本発明で云う配向の方向とは、これらの基材の面に平行な方向（成分）に関するものであり、これらの基材の厚さ方向（成分）については不問である。
【００２２】
図１に示す本発明の情報記録媒体１０は、主に非晶性熱硬化型ウレタン高分子樹脂層１１、第一の表面基材１、接着層８、センターコア７、接着層８、第二の表面基材２、非晶性熱硬化型ウレタン高分子樹脂層１２が順次積層されて構成されている。
【００２３】
次に、各構成について説明する。
この例は、本発明の情報記録媒体の一代表例であって、第一の表面基材１及び第二の表面基材２は、表面に非晶性熱硬化型ウレタン高分子樹脂層１１、１２が形成されている構成である。
第一の表面基材１及び第二の表面基材２の結晶性熱可塑性高分子樹脂は、情報記録媒体の高耐久性に必要な強度、強靭性等を付与し、また二軸延伸処理を施されることにより、その効果が更に強化される。基材表面に形成される非晶性熱硬化型ウレタン高分子樹脂層１１、１２は二軸延伸処理を施された結晶性高分子基材の表面に、耐久性、柔軟性、表面成形性等を持たせ、情報記録媒体に、エンボス適性、レーザー刻印の印字適性、磁気ストライプ４の埋め込み適性を情報記録媒体に付与する。
【００２４】
ここで、二軸延伸処理を施された結晶性高分子基材の厚さが厚ければ、媒体の強度、耐熱性などが高くなるが、その一方では、媒体の剛性は高まりまた堅さも強くなり、情報記録媒体としての好ましい柔軟性を欠き、硬いものとなってしまう。二軸延伸処理を施された強靱になった結晶性高分子の表面基材１，２上に、本発明のように非晶性ウレタン高分子樹脂層１１，１２を設けることにより、表面基材に柔軟性、エンボス加工適性、磁気ストライプ４の埋設加工適性を付与することができる。
尚、更に云うと、表面基材上に設けた非晶性ウレタン高分子樹脂の層を熱硬化型することにより、表面の耐薬品性、耐溶剤性などの耐久性が強くなる。
【００２５】
尚、本発明で、この非晶性ウレタン高分子樹脂層を設けるのは、必ずしも表面基材１と同２との両方に設けなければならないわけではなく、いずれか片方のみに設ける層構成、即ち、非晶性熱硬化型ウレタン高分子樹脂層の１１か同１２のうち、いずれか片方だけを設ける層構成としてもよい。但し、片方のみにした場合には、例えば磁気ストライプを設けるのは、非晶性熱硬化型ウレタン高分子樹脂層が有る側に設けるようにする（磁気ストライプを埋設する加工の適性や、磁気ストライプの存在を外観等では容易に判らぬように隠蔽する隠蔽性の観点で優れたものとする為）。
【００２６】
磁気ストライプ４などを、本発明に関わる情報記録媒体の表面に段差が生じぬように、情報記録媒体に埋設するためには、非晶性熱硬化型ウレタン高分子樹脂層１１，１２を厚くした方が良いが、その反面、非晶性熱硬化型ウレタン高分子樹脂層１１，１２の厚さが厚くなれば、情報記録媒体の柔軟性が高くなるが、媒体の強度、耐熱温度などが弱くなる傾向がある。そこで、結晶性熱可塑性高分子基材１，２の厚さと、非晶性熱硬化型ウレタン高分子樹脂層１１，１２の厚さとのバランスを、得ようとする情報記録媒体が要求される性能・品質を考慮して適宜設計することが重要である。
【００２７】
本発明は、結晶性熱可塑性高分子樹脂の表面基材１，２の厚さや非晶性熱硬化型ウレタン高分子樹脂層１１，１２の厚さ（ここで非晶性熱硬化型ウレタン高分子樹脂層は前記のように片方だけ設ける場合もありえる）に関しては、
（ａ）結晶性熱可塑性高分子樹脂の表面基材１，２の厚さはそれぞれ２５〜１５０μｍ、また、非晶性熱硬化型ウレタン高分子樹脂層１１，１２の厚さは２〜５０μｍ、
好ましくは、更に（ｂ）「結晶性熱可塑性高分子樹脂の表面基材１，２の厚さ（１層分）」が、「非晶性熱硬化型ウレタン高分子樹脂層１１，１２の厚さ（１層分）」の２倍以上、
となるように設定する。
さもなくば、情報記録媒体の前記特性（強度、耐熱性、剛性、硬さ、等）が、実用上、不満足なものとなる。尚、ここで非晶性熱硬化型ウレタン高分子樹脂層の厚さの方が、結晶性熱可塑性高分子樹脂の表面基材（１，２）の厚さと比べると、相対的に重要である。
【００２８】
尚、反り等を予防し又は低減しようとする観点から、一般には、結晶性熱可塑性高分子樹脂の表面基材１と同２とは、互いの厚さを同じ（又は適宜同等）にすることが好ましい。また、非晶性熱硬化型ウレタン高分子樹脂層についても、［もし両方の側に設ける場合には、前記表面基材の場合と同様の理由で］一般に、互いの厚さを同じ（又は適宜同等）にすることが好ましい。
（但し、もし情報記録媒体の厚さ方向で、層構成が非対象であるとか又は構成部品等の配置が非対象であるとき、場合によっては、情報記録媒体に反り等の変形が生じるおそれもある。その場合は変形対策として、例えば、表面基材の厚さ又は非晶性熱硬化型ウレタン高分子樹脂層の厚さ等を前記の数値範囲内で適宜選択してよい。）
【００２９】
結晶性熱可塑性高分子樹脂の熱溶融温度が高いため、第一の表面基材１、センターコア７、第二の表面基材２を容易に加熱加圧一体化するには、結晶性熱可塑性高分子樹脂の表面基材１、２とセンターコア７の間に、それぞれ熱溶解温度の低い非晶性熱可塑性高分子樹脂層からなる接着層８を形成して、加熱加圧により、第一の表面基材１、センターコア７、第二の表面基材２を容易に積層一体化することができる。
加熱温度や加圧圧力は接着可能であれば構わないので、材料により適宜設定可能であるが、結晶性熱可塑性高分子樹脂層の表裏にそれぞれ熱溶解温度の低い非晶性熱可塑性高分子樹脂層を形成した場合には、一般的に温度１００〜１５０℃、圧力５００〜１５００ｋＰａの間で適宜選択することが好ましい。
【００３０】
また、非晶性熱硬化型ウレタン高分子樹脂層１１，１２の形成と、積層による一体化の手順としては、例えば、
（イ）予め結晶性熱可塑性高分子樹脂の基材表面１，２のそれぞれに又は一つの表面に、非晶性熱硬化型ウレタン高分子樹脂層１１，１２を形成して、第一の表面基材１、センターコア７、第二の表面基材２を積層することで一体化等を行うか、あるいは、
（ロ）第一の表面基材１、センターコア７、第二の表面基材２を一旦積層することで一体化したうえで、積層体の表面にあたる第一の表面基材１と第二の表面基材２の両方かまたは片方の表面に、非晶性熱硬化型ウレタン高分子樹脂層１１，１２を形成するか、
いずれでもよい。
【００３１】
第一の表面基材１と第二の表面基材２の結晶性熱可塑性高分子樹脂としてＰＥＴ（ポリエチレンテレフタレート）、ＰＥＮ（ポリエチレンナフタレート）ポリビニルアルコール、ポリオレフィン、ポリ乳酸、ポリエチレン・ビニルアルコール、ポリアクリロニトリル、ポリプロピレン等を用いることができる。
しかし、情報記録媒体の耐熱性、耐久性、コスト、及び加工適性から、一般にはＰＥＴを用いた方がより好ましい。
【００３２】
表面基材１，２に柔軟性、エンボス適性、及び磁気ストライプ４の埋設適性を付与する為には、例えば、表面基材１，２の表面に非晶性熱可塑性高分子樹脂層１１，１２を設けることによって効果が得られる。しかしその反面、表面の耐久性、耐薬品、耐熱性、及び、耐溶剤性が弱くなってしまう欠点がある。
そこで、非晶性高分子樹脂層として、単に熱硬化型樹脂を用いることが好ましいのではないかとも考えられたが、熱硬化型高分子樹脂は、一般に強靭で表面の濡れ性が悪い、印刷等を施しにくい、等の短所がある。
【００３３】
これらに着眼して、本発明では、表面の柔軟性や印刷適性等の特性（長所）を低下させない熱硬化型樹脂として、特には、ＯＨとＮＣＯとの架橋反応からなるウレタン樹脂を採用することを見出した。即ち、末端にＯＨ官能基を持つポリマーに、二つ以上のＮＣＯ官能基を持つイソシアナート化合物の架橋剤を加え、ＯＨとＮＣＯとを架橋することにって、高分子樹脂の耐久性を向上させるものである。
これによると、熱硬化型ウレタン樹脂のＯＨとＮＣＯとの架橋密度がもし低すぎると、樹脂が柔らかくなり、耐熱性などの耐久性が低くなる。一方、その架橋密度がもし高すぎると、樹脂が硬く、強靭になり、表面濡れ性が悪くなってしまう。そこで本発明では、架橋率に関わるＯＨ価を１〜２０ｍｇＫＯＨ／ｇとし、これによって、強靭性、柔軟性、耐久性、及び、表面濡れ性等のバランスがよい特性が得られる。
【００３４】
非晶性熱硬化型ウレタン高分子樹脂層１１，１２に、使用される上記の末端にＯＨ官能基を有するポリマーとして、例えば末端にＯＨ官能基を持つポリエステルポリマー、ポリエステルポリオール、ポリエステルウレタン、ポリウレタン、ポリウレタンポリオール、アクリルポリオール等を用いることができる。
【００３５】
媒体の表面にエンボス印字などを行うため、エンボス印字などによる記録媒体表面の割れを防止するため、伸びやすく弾性率が５００〜２，５００ＭＰａで、形成しやすいポリマーを用いた方が好ましい。弾性率が高すぎると、樹脂剛性が高く、エンボスなどの二次加工による樹脂の塑性変形に追従できず、割れが発生したり、塑性変形のエンボスの高さが低くなることがある。しかし弾性率が低すぎると、樹脂が柔らかくなり、媒体の表面が弱く、損傷を受けやすくなる。
二つ以上のＮＣＯ官能基を持つイソシアナート化合物としては、ＴＤＩ系（トルエンジイソシアネート）、ＭＤＩ系（リメチレンジイソシアネート）、ＸＤＩ系、ＩＰＤＩ系、ＨＤＩ系があるが、紫外線などによる黄変の無いＸＤＩ、ＩＰＤＩ、ＨＤＩなどを用いた方が好ましい。
尚、それらの樹脂に有機顔料、無機顔料または有機染料、無機染料、安定剤、表面活性剤などの添加剤を加え、樹脂を改質することも可能である。
【００３６】
結晶性熱可塑性高分子樹脂からなる表面基材１，２の表面に非晶性熱硬化型ウレタン高分子樹脂層１１，１２を形成するには、上記の末端にOH官能基を有するポリマーの溶解液と二つ以上のＮＣＯ官能基を有するイソシアナート化合物の架橋剤の混合液を表面基材上１，２の表面に塗布するか、または予め他の中間基材の表面に塗布してから、上記の表面基材１，２に転写して形成することができる。
この混合液の塗布方法としては、例えば、グラビアコーター、ナイフコーター、印刷機器、などを用いて塗布することができる。
【００３７】
また、上記の情報記録媒体の基材表面に非晶性熱硬化型ウレタン高分子樹脂層を１１，１２形成するにあたって、第一の表面基材１、センターコア７、第二の表面基材２を積層一体化する前に、予め表面基材１，２上に非晶性熱硬化型ウレタン高分子樹脂層１１，１２を形成してから、積層一体化を行うか、または予め積層一体化してから情報記録媒体の表面に形成するか、いずれの方法でもその効果がある。
【００３８】
結晶性熱可塑性高分子樹脂の二軸延伸処理を行うことにより、表面基材の強度及び耐久性を強くすることができる。しかし、二軸延伸処理された基材が異方性を持つため、異なる方向の強度、熱力学的な性質が異なる基材となる。
第一の表面基材１、センターコア７、第二の表面基材２を積層一体化することにより、形成された情報記録媒体は第一の表面基材１と、第二の表面基材２の高分子の配向の方向が一致しないと、媒体には反り、ツイスト、又は、カールが容易に発生してしまう。
そこで、本発明の請求項２，１０等にも示したように、第一の表面基材１の高分子配向と、第二の表面基材２の高分子配向とが図２に示したように積層し、両者の間で高分子配向の方向を、互いに同じ方向になるよう揃えて、一体化することが重要である。
【００３９】
ここで、図２は基材の分子配向の概念図を示すものであり、図中、上下の基材に描いてある円や線は、重ね合わせる２つの基材（結晶性熱可塑性高分子樹脂基材１２と同２２）の配向方向が同じ方向に揃っていることを表している。尚、この分子配向のパターンは、試料の誘電率の異方性による透過マイクロ波強度の変化をみることで判り、例えば、分子配向計［王子計測機器（株）、ＭＯＡ−３０００シリーズ］により調べることができる。
【００４０】
本発明に関わる非晶性熱硬化型ウレタン高分子樹脂層１１，１２を、第一の表面基材１、センターコア７、第二の表面基材２を積層一体化してなる積層体の表面基材の表面に形成する場合、例えば、ウェブ状のフィルムになっている表面基材の材料の縦方向（ＭＤ方向。ウェブの巻き取りの長手方向。）に並んで位置する材料から、表面基材１及び表面基材２の基材シートを取り、互いに縦方向及び横方向（ＴＤ方向。ウェブの幅方向。）を揃え、センターコア７を芯側に併せて積層することで一体化する。
このように得られる積層体の両表面側にまたは片方の表面側に、本発明に関わる非晶性熱硬化型ウレタン高分子樹脂の層を設ける。
【００４１】
第一の表面基材１及び第二の表面基材２の各々に用いられる表面基材のフィルムを加工する際に、高分子の配向を間違えないため、表面基材をまず一定幅にスリッタして、スリッタされた表面基材シートを縦方向（ＭＤ方向）、因みにフィルムの巻き取りの前後方向から、第一の表面基材１及び第二の表面基材２の基材シートを取り、それぞれ延伸の縦方向（ＭＤ方向）及び横方向（ＴＤ方向）を揃えるように積み重ねてから、その積み重ねた高分子配向の揃った表面基材シートのコーナーをカットするか、あるにはシートの縁部に切り口を入れ、目印を付けた方が好ましい。
【００４２】
第一の表面基材１とセンターコア７と、第二の表面基材２を積層一体化する前に結晶性熱硬化型ウレタン高分子樹脂層１１，１２を、予め第一の表面基材１と第二の表面基材２のそれぞれ、または一方のセンターコアから遠い側の表面に形成する場合、同じく表面基材１，２の高分子配向の方向を揃えなければならない。
【００４３】
例えば、縦方向（ＭＤ方向）、因みにフィルムの巻き取りの前後方向から、まず先に巻きだしたフィルムのおもて面に非晶性熱硬化型ウレタン高分子樹脂層１１を形成して表面基材１とする。
そして、次に巻きだしたフィルムのうら面に非晶性熱硬化型ウレタン高分子樹脂層１２を形成して表面基材２とする。積層一体化する際、表面基材１を情報記録媒体の上表面にして、センターコア７、そして下表面に表面基材２とする。
表面基材１及び表面基材２の非晶性熱硬化型ウレタン高分子樹脂層１１，１２を、それぞれ媒体外面にし、更に表面基材１と表面基材２の高分子の縦方向（ＭＤ方向）及び横方向（ＴＤ方向）を揃えるように積層する。
【００４４】
非晶性熱硬化型ウレタン高分子樹脂層１１，１２の表面に磁気ストライプ４を形成して磁気ストライプ記録層付き情報記録媒体として用いる場合、予め上記の非晶性熱硬化型ウレタン高分子樹脂層１１，１２を形成してある表面基材１，２とセンターコア７を積層一体化する前に、非晶性熱硬化型ウレタン高分子樹脂層１１，１２に磁気ストライプ４を配置して、表面基材１，２とセンターコア７を積層一体化を行い、磁気ストライプ４を基材表面に埋設して表面を面一する。または、表面基材１，２、センターコア７を積層一体化してから、非晶性熱硬化型ウレタン高分子樹脂層１１，１２に磁気ストライプ４を配置してもう一回加熱加圧一体化を行い、磁気ストライプ４を基材表面に埋設して表面を面一する。この場合は非晶性熱硬化型ウレタン高分子樹脂層１１，１２を予め表面基材上に形成するか、表面基材とセンターコアを積層一体化してから形成してもよい。
【００４５】
結晶性熱可塑性高分子樹脂基材１，２の表面、またはそれらの表面に形成された非晶性熱硬化型ウレタン高分子樹脂層１１，１２の表面の全面また一部に、ＩＤ情報及び絵柄デザイン等の印刷層が設けられているものでもよい。
また、表面基材と印刷層、非晶性熱硬化型ウレタン高分子樹脂層１１，１２と印刷層の接着性を向上させるために、表面基材の表面か又は非晶性熱硬化型ウレタン高分子樹脂層の表面に、易接着処理（例えば、コロナ放電処理、プラズマ処理、又は、樹脂塗布、等）を施しても良い。
【００４６】
更に、表面基材１と、表面基材２の表面に形成されている非晶性熱硬化型ウレタン高分子樹脂層１１，１２の表面または印刷層の表面に、ほかの機能性薄膜層、例えば、隠蔽層、保護層、可視記録層、ホログラム層５等を、全面に又は一部に設けても良い。
更に上記のように、非晶性熱硬化型ウレタン高分子樹脂層１１，１２に磁気ストライプ４を形成している場合、磁気ストライプ４を表面に埋設し、表面を面一してから、磁気ストライプ４を隠蔽する隠蔽層３を設けてもよい。
更に、磁気記録層、磁気ストライプ４、隠蔽層３、保護層６を形成して、更に加熱加圧により、磁気記録媒体の表面面一を行ってもよい。
【００４７】
センターコア７としては非晶性熱可塑性高分子樹脂からなる。
例えば、ポリ塩化ビニル、ポリ酢酸ビニル、ポリビニルブチラール、ポリ塩化ビニリデン、ポリビニルアセタール、ＡＳ樹脂、ポリカーボネート、ポリメタクリル酸メチル、ポリスチレン、ＡＢＳ樹脂、ポリスルホン、セルロイド、ポリフェニレンオキサイド、非晶性エラストマー、ＰＥＴＧ、等の合成樹脂類、天然樹脂類、またはそれらの樹脂の変性樹脂などを単独または組み合わせた複合体、アロイ体、ブレンド体等の非晶性固体を使用することができる。
更にそれらの樹脂に有機顔料、無機顔料または有機染料、無機染料、安定剤、表面活性剤などの添加剤を加え、樹脂を改質することも可能である。
【００４８】
また、センターコア７は必要に応じて上記高分子樹脂の複層構成を用いてもよい。
例えば、２層のセンターコア層、または数層のセンターコア層を用いて予め加熱加圧により一体化してセンターコア７として用いるか、第一の表面基材１、センターコア７、第二の表面基材２を一体化する際に、一緒に積層一体化することができる。
【００４９】
また、本発明請求項７に記載したように、センターコア７中にアンテナ付きの非接触ＩＣモジュール９を埋め込むことも可能である。
例えば、センターコア７を２層にして、２層の間にアンテナ付き非接触ＩＣモジュール９を配置して、熱ラミネートを行うことにより、ＩＣモジュール９をセンターコア７中に埋設する。
【００５０】
ＩＣモジュール９は、受信用また送信用のアンテナコイル（ここで「アンテナコイル」は本明細書中ではコイル状を成したアンテナを指す）とデータ蓄積用のメモリ、さらに場合によってはデータ演算用等のＣＰＵ、エネルギー供給用の電池（図示せず）などから成る。
出来上がる非接触ＩＣカード（本発明に関わる情報記録媒体の一代表例）の外観、形状等に好ましくない影響を及ぼさないようにするため、ＩＣモジュール９はなるべく薄型のものを用いた方が好ましい。
また、ＩＣモジュール９の取扱い易さ、低コストであること等から、プリント基板型の一体型モジュールを用いても良い。
【００５１】
２枚の基材の間にＩＣモジュール９を挟んで、加熱、加圧方式により、非接触ＩＣカード記録媒体を作製する際、カード記録媒体の表面を平滑にするため、加熱温度を高くし、圧力により基材樹脂をＩＣモジュール上下から流してＩＣモジュールを埋め込んだ方が好ましい。
その際、チップへかかる圧力を減らすため、基材樹脂を加熱してから、加圧を行った方がよい。
またセンターコアの基材上に、ＩＣモジュール９に搭載されたチップ等電気部品と同等の大きさの穴を穿ち、ＩＣモジュール９をチップ等の電気部品を穴に埋め込むよう、基材上に設置してから、加熱、加圧を行う方が好ましい。
【００５２】
結晶性熱可塑性の表面基材１，２と非晶性熱可塑性センターコア７を容易に積層一体化を行うことができるため、第一の表面基材１とセンターコア７の間に、また第二の表面基材２とセンターコア７の間にそれぞれに接着層８を設ける。更に用途により、印刷層、隠蔽層等の機能性層を設けることもできる。
更に情報記録媒体の仕様によって、第一の表面基材１とセンターコア７の間に、また第二の表面基材２とセンターコア７の間に、それぞれに中間基材を設けることもできる。
中間基材の表面にも接着層、印刷層などを設けることもできる。
【００５３】
非接触ＩＣモジュール９付きの情報記録媒体の積層一体化方法としては、第一の表面基材１、センターコア７の基材、ＩＣモジュール９、センターコア７の基材、第二の表面基材２を順次に積層して加熱、加圧を行う一回方式と、先ず、センターコア７の基材、ＩＣモジュール９、センターコア７の基材を順次に積層して第一次加熱、加圧を行い、ＩＣモジュール９とセンターコア７の基材の一体化を先ず行い、ついで、ＩＣモジュール９が埋設されているセンターコア７上下表面に、第一の表面基材１、第二の表面基材２をそれぞれ積層して第二次加熱加圧を行う二回方式とがある。何れの方式も、非晶性熱硬化型ウレタン高分子樹脂層１１，１２を予め、表面基材１，２の表面形成するか、積層一体化してから、形成するか、どちらでも差し使いがない。
【００５４】
【実施例】
以下、更に本発明の具体的な実施例を挙げて説明する。
＜実施例１＞
図１は本発明の第１の実施例に係る情報記録媒体１０の構成を各工程に示す説明図である。
【００５５】
厚さ１００μｍの白色の二軸延伸ポリエチレンテレフタレートフィルムを結晶性熱可塑性高分子樹脂の表面基材とし、末端にＯＨ官能基を有する非晶性ポリエステルウレタンとＨＭＤＩ（ヘキサメチレンジイソシアネート）の下記の組成の混合物を非晶性熱硬化型ウレタン高分子樹脂とした。
【００５６】
＜組成＞
ポリエステルウレタンＵＲ１４００（東洋紡製ＫＯＨ２〜３ｍｇ／ｇ）１００部
ＴＤＩのタケネートＤ２０２（武田薬品製）３部
ＭＥＫ５０部
トルエン６０部
【００５７】
まず、幅が４００mmのウェブになっている白色で二軸延伸済みのポリエチレンテレフタレートの基材の表面に、上記の混合液をグラビアコーターにて塗膜が１０μｍとなるように塗布して、長さが４００ｍｍのシートを１枚取り、前方向の左側をコーナカットして本発明の表面基材１とした。
次に、幅が４００mmのウェブになっている白色二軸延伸ポリエチレンテレフタレートの基材の裏側の表面に上記の混合液をグラビアコーターにて塗膜が１０μｍとなるように塗布して、長さが４００ｍｍのシートを１枚取り、前方向の左側をコーナカットして本発明の表面基材２とした。
【００５８】
厚さ１８μｍの銅箔でできたエッチングアンテナ付きの一体型ＩＣモジュールを、ＩＣモジュール９として用いる。この厚さ１８μｍの銅箔は基板上に箔として設けてあり、ここでは既にその銅箔がエッチングによってアンテナ用にパターニングされてあるものを用いた。ここで、基板の厚さは１２０μｍ、チップ封止材を含むＩＣチップ部品の厚さは２５０μｍでサイズ２×２ｍｍである。
【００５９】
サイズ４００ｍｍ×４００ｍｍで厚さ２８０μｍの、白色をなす基材である非晶性ポリエステル樹脂；ＰＥＴＧ［曲げ弾性率は１，９８０ＭＰａ、ガラス転移点（Ｔｇ）は６３℃］につき、２枚をいずれもセンターコア７に用いる基材として、この２枚のセンターコア７用の基材の間に、上記のＩＣモジュール９を設置して、その積層体を熱プレス機にセットし、温度を１４５°Ｃ、圧力を約１，０００ｋＰａとした条件で熱プレスを行い一体化した。このように、ＩＣモジュール９入りの積層体を本発明のセンターコア７とした。
そして、センターコア７の表側，裏側の表面に、表面基材１及び表面基材２を、それぞれの非晶性熱硬化型ウレタン高分子樹脂層１１，１２を外側にして、且つ、表面基材１と表面基材２のコーナーカット部が合うようにして、センターコアを挟むよう積層した。
【００６０】
このようにして積層された積層体の表面（非晶性熱硬化型ウレタン高分子樹脂層１１側）に、磁気ストライプのテープを転写により磁気ストライプ４が表面に載るかのように設けたうえ、積層体を熱プレス機にセットして、温度を１３５°Ｃ、圧力を約１，０００ｋＰａとした条件で熱プレスを行い、一体化した。
そして、厚さの０．７８ｍｍの積層体が得られ、このとき磁気ストライプ４の表面と、基材表面の磁気ストライプが無い領域の表面（非晶性熱硬化型ウレタン高分子樹脂層１１側）とが面一にされ、磁気ストライプによる段差が無く、外側表面が平坦なものになった。
【００６１】
この積層体の磁気ストライプ４側の表面に、市販のシルバーインキからなる隠蔽層３をスクリーン印刷機にて厚さ２μｍで形成し、更に、クリアの樹脂からなる保護層６を形成したうえ、再び加熱及び加圧を行うことにより表面に光沢を付与し、しかる後に、カード（いわゆるＩＣカード類）の形状に断裁することで、実施例１に関わる情報記録媒体１０とした。
【００６２】
得られた情報記録媒体１０の表面、表面が平滑となり、磁気ストライプ４が隠蔽された。更に情報記録媒体の表面に、ホログラム転写箔を転写しホログラム層５を設け、レーザー刻印による印字を行いレーザ刻印文字６を形成した。
ホログラムの転写が問題なく、更にレーザー刻印印字の文字縁部の膨れも生じなかった。
情報記録媒体の耐熱温度を評価したところ、熱変形温度は９５°Ｃという高い耐熱特性が得られた。また、磁気ストライプを備えたことに起因して評価した磁気特性も、ＪＩＳ規格を十分にクリアできるものであった。
【００６３】
【発明の効果】
以上述べたように、本発明によれば、延伸処理を施された結晶性熱可塑性高分子樹脂基材の第一の表面基材、センターコア、延伸処理を施された結晶性熱可塑性高分子樹脂基材の第二の表面基材を積層一体化してなる情報記録媒体において、第一の表面基材と第二の表面基材の一方または両方の表面に、非晶性熱硬化型ウレタン高分子樹脂層を形成することにより、磁気ストライプの埋設、レーザー刻印印字、表面へのホログラム転写箔の転写が可能になる。
また延伸処理を施された結晶性熱可塑性高分子樹脂基材を用いることにより、情報記録媒体の耐熱性が高くなり、耐久性がよくなる。
【００６４】
つまるところ、本発明によれば、従来の技術と比べて、耐久性、耐熱性、耐薬品性、エンボス加工適性（エンボスの容易性、低カール性、耐割れ性）、印刷インキの密着性（なじみ易さ）、又は、レーザ印字の適性などは、同等か又はそれ以上に改善されたものとすることができ、特に磁気ストライプ・テープの埋め込み加工の容易さや埋設した辺りの情報記録媒体の外側表面の平坦さ（段差が無いか又は段差が実質判り難い）に優れており、また、特にその磁気ストライプ・テープを隠蔽する隠蔽層などを形成する際の溶剤に侵され難く（溶剤への耐久性が高くて隠蔽層の隠蔽性が低下し難い）、埋設した磁気ストライプを巧く隠蔽できること、これらを満たす情報記録媒体とその製造方法を提供することが出来た。
【図面の簡単な説明】
【図１】本発明の実施例１に係わる情報記録媒体構成を示す断面図である。
【図２】本発明の第一の表面基材と第二の表面基材の、高分子基材の配向方向を揃える方法を示す概念図である。
【符号の説明】
１・・・第一の表面基材
２・・・第二の表面基材
３・・・隠蔽層（印刷層）
４・・・磁気ストライプ
５・・・ホログラム層
６・・・保護層
７・・・センターコア
８・・・接着層
９・・・ＩＣモジュール
１０・・・情報記録媒体
１１・・・非晶性熱硬化型ウレタン高分子樹脂層
１２・・・非晶性熱硬化型ウレタン高分子樹脂層
３９・・・マイクロ波高分子配向計測定した配向パターン[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to cards represented by cash cards, credit cards, ID cards (identification cards), driver's licenses, members' cards, prepaid cards, etc., or tags (generally, tags, tokens, or Information recording medium, which has various names such as transponders, and is particularly excellent in high heat resistance, high durability, suitability for embossing, or suitability for laser printing, or environmentally friendly information. The present invention relates to a recording medium and a method for manufacturing the same, and as a preferred example, a contact type IC card (provided with a contact type communication function via an external terminal), particularly, Contactless IC card (with the communication function of the type) or a composite IC card (with both the contact-type communication and the contactless communication function described above). It is.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, information recording media such as cash cards, credit cards, ID cards, and the like have been widely used, and their materials are mainly polyvinyl chloride (hereinafter simply referred to as PVC) and vinyl chloride / vinyl acetate copolymer. In particular, polyvinyl chloride is generally used.
Polyvinyl chloride resin is widely used as a material for information recording media, such as cards, because of its excellent physical mechanical properties and suitability for embossing of a character portion, and low cost of the material.
[0003]
By the way, in recent years, as information recording media have been integrated into ICs, it is expected that the functions of the information recording media will be enhanced.
In particular, high durability, high heat resistance and an environment-friendly information recording medium are required.
However, a polyvinyl chloride resin or a vinyl chloride / vinyl acetate copolymer resin, which is a base material of a conventional information recording medium, has low heat resistance, and when the storage temperature exceeds 80 ° C., the recording medium may be deformed.
Further, when the polyvinyl chloride resin is discarded after use, it generates hydrogen chloride gas, particularly at the time of incineration, which damages the incinerator and shortens its life. It is also said that dioxin may be generated during incineration, depending on the incineration temperature.
[0004]
Therefore, a halogen-free thermoplastic resin such as a polyethylene resin, a polypropylene resin, a polyester resin, a polycarbonate resin, and a polyacryl resin has been proposed as a substitute resin for the polyvinyl chloride resin.
However, since the properties of these resins are considerably different from those of the polyvinyl chloride resin, it is necessary to perform a new resin modification or the like in order to use them as a material of an information recording medium such as a card.
[0005]
Therefore, in recent years, PETG, which is a kind of amorphous polyester resin, has attracted attention and has been used because it has physical properties similar to polyvinyl chloride.
[PETG is a trademark of a polyester resin manufactured by Eastman Chemical Company. It is said to be obtained by a dehydration condensation reaction of ethylene glycol with terephthalic acid and cyclohexanedimethanol. ]
In addition, in order to meet the demand for high heat resistance (such as withstanding high temperatures in a vehicle interior), an alloy resin of PETG and polycarbonate (hereinafter simply abbreviated as PC) has been developed and used for cards.
However, PETG generally has a low heat-resistant temperature, and in the case of an alloy resin of PETG and PC, adaptability to embossing (such as characters) of a card is low. For example, there is a problem that a large curl is generated by embossing. Have
In addition, PETG and PC are easily dissolved or swelled by an organic solvent, and the base material is deteriorated by processing such as printing or heating / pressing during the manufacturing process of the information recording medium, and the inherent durability is reduced. Sometimes.
[0006]
Therefore, in the layer configuration of the information recording medium, a technique has been developed in which polyethylene terephthalate (hereinafter, simply referred to as PET) is biaxially stretched as the base material on the front and back sides of the card.
However, PET substrates differ from conventional substrates for information recording media in terms of their surface suitability, and have low adhesion (ease of adaptation) of printing ink and cracks on the media surface during embossing. There are a number of problems that must be solved, such as the difficulty in processing when embedding the magnetic stripe in the surface substrate, or the swelling of the character edge due to the printing energy during laser printing.
Conventionally, none of these materials is a suitable material for an information recording medium such as a card, which can necessarily cope with various specifications of the information recording medium.
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above-mentioned problems of the conventional technology, and is more durable, heat-resistant, chemical-resistant and more suitable for embossing (easiness of embossing, lower curl, The cracking resistance), the adhesion of the printing ink (ease of conformity), or the suitability of laser printing can be improved to the same or more, especially the embedding of magnetic stripe tape. And the flatness of the outer surface of the information recording medium around the buried area (there is no step or the step is hardly noticeable), and especially, a concealing layer for concealing the magnetic stripe tape is formed. A magnetic recording medium and a method of manufacturing the information recording medium satisfying the above conditions. Offer For the purpose of Rukoto.
[0008]
[Means for Solving the Problems]
That is, the first aspect of the present invention provides a first surface substrate which is a substrate using a thermoplastic polymer resin, a center core which is a substrate using a thermoplastic polymer resin, and a thermoplastic resin. An information recording medium which is stacked so that the order relation of the positions of at least the three base materials of the second surface base material using the molecular resin is relatively arranged in this order,
The first surface base material and the second surface base material are, respectively, a crystalline thermoplastic polymer resin base material that is a base material to which a crystalline thermoplastic polymer resin has been subjected to a biaxial stretching process. Used
For either one or both of these surface substrates, the surface farther from the center core is provided with an amorphous thermosetting urethane, which is a layer using a thermosetting polyurethane of an amorphous polymer resin. An information recording medium provided with a molecular resin layer is provided.
[0009]
The invention according to claim 2 is directed to the orientation of the crystalline thermoplastic polymer resin substrate of the first surface substrate and the orientation of the crystalline thermoplastic polymer resin substrate of the second surface substrate. 2. The information recording medium according to claim 1, wherein the direction of the information recording medium coincides with the direction of the information recording medium.
[0010]
The invention according to claim 3, wherein the first surface base material and the second surface base material each use the crystalline thermoplastic polymer resin base material, biaxially stretched polyethylene terephthalate. And
In addition, of the first surface substrate and the second surface substrate, the surface substrate on which the amorphous thermosetting polymer resin layer is formed has the crystalline thermoplastic polymer resin. 3. The information recording medium according to claim 1, wherein a thickness of the substrate is larger than a thickness of the amorphous thermosetting polymer resin layer. .
[0011]
The invention according to claim 4 is characterized in that the amorphous thermosetting urethane polymer resin layer comprises a polymer having an OH functional group at a terminal and an isocyanate compound of a crosslinking agent having two or more NCO functional groups. An information recording medium according to any one of claims 1 to 3, characterized in that:
[0012]
According to a fifth aspect of the present invention, at least a magnetic stripe is provided on the amorphous thermosetting urethane polymer resin layer, and a concealing layer is provided thereon so as to conceal the magnetic stripe. An information recording medium according to any one of claims 1 to 4, characterized in that:
[0013]
In the invention according to claim 6, an adhesive layer is formed between the first surface base material and the center core and between the center core and the second surface base material. An information recording medium according to any one of claims 1 to 5, characterized in that:
The material of the adhesive layer is not necessarily limited, but a preferable typical example is an amorphous thermoplastic polymer resin (preferable from the viewpoint of performance).
[0014]
According to a seventh aspect of the present invention, the center core includes at least an IC chip having a function for non-contact communication, and an antenna for performing non-contact communication in combination with the IC chip. It has an IC module,
A structure in which all or a part of the non-contact IC module is sandwiched from both sides by an amorphous thermoplastic polymer resin layer which is at least an amorphous thermoplastic polymer resin layer. An information recording medium according to any one of claims 1 to 6 is provided.
[0015]
The invention according to claim 8 is characterized in that the amorphous thermosetting urethane polymer resin layer is formed to have a thickness of 2 to 50 μm. Is provided.
[0016]
The invention according to claim 9 is a first surface substrate that is a substrate using a thermoplastic polymer resin, a center core that is a substrate using a thermoplastic polymer resin, and a thermoplastic polymer resin. A method of manufacturing an information recording medium by laminating the second surface base material using at least the order of the positions of the three base materials so that the positions are relatively arranged in this order,
The first surface substrate and the second surface substrate, respectively, using a crystalline thermoplastic polymer resin substrate is a crystalline thermoplastic polymer resin biaxially stretched substrate,
For either one or both of these surface substrates, the surface farther from the center core is provided with an amorphous thermosetting urethane, which is a layer using a thermosetting polyurethane of an amorphous polymer resin. It is intended to provide a method for producing an information recording medium, which comprises a step of forming a molecular resin layer.
[0017]
The invention according to claim 10, wherein when laminating the at least three substrates, the orientation direction of the crystalline thermoplastic polymer resin substrate of the first surface substrate and the second surface substrate 10. The method for manufacturing an information recording medium according to claim 9, wherein the direction of orientation of the crystalline thermoplastic polymer resin substrate is matched.
[0018]
The method according to claim 11, wherein the step of forming the amorphous thermosetting urethane polymer resin layer comprises:
A solution obtained by using a solution of a polymer having an OH functional group at a terminal and a crosslinking agent of an isocyanate compound having two or more NCO functional groups is directly applied to the surface substrate, or
The above-mentioned mixed solution is once applied to the surface of an intermediate base material which is a base material different from the base material, and after the amorphous thermosetting type urethane resin is formed in a layer in advance, the layered amorphous thermosetting Transferring the urethane resin to the surface substrate,
The method of manufacturing an information recording medium according to claim 9, wherein the amorphous thermosetting urethane polymer resin layer is formed by any one of these. .
[0019]
The invention according to claim 12, wherein the first surface substrate, the center core, and at least one of the three substrates of the second surface substrate, the side facing another substrate adjacent thereto. Provide an adhesive layer using a polymer resin that exhibits adhesiveness by heating,
12. The information recording medium according to claim 9, wherein the lamination is performed by a step of applying both heat and pressure in a state where at least the three base materials are overlapped. It provides a method.
The material of the adhesive layer is the same as that of the sixth aspect.
[0020]
The invention according to claim 13 is a first surface substrate that is a substrate using a thermoplastic polymer resin, a center core that is a substrate using a thermoplastic polymer resin, and a thermoplastic polymer resin. A method of manufacturing an information recording medium by laminating the second surface base material using at least the order of the positions of the three base materials so that the positions are relatively arranged in this order,
The first surface substrate and the second surface substrate, respectively, using a crystalline thermoplastic polymer resin substrate is a crystalline thermoplastic polymer resin biaxially stretched substrate,
On the amorphous thermosetting type urethane polymer resin layer, at least a magnetic stripe is arranged, and at least the three base materials are superimposed on each other. By doing, the outermost surface is leveled,
Thereafter, at least on the surface on which the magnetic stripe is provided, providing a concealing layer for concealing the magnetic stripe,
A method for manufacturing an information recording medium according to any one of claims 9 to 12 is provided.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a conceptual sectional view showing the configuration of an information recording medium 10 according to an embodiment of the present invention.
FIG. 2 is a conceptual diagram showing a method of aligning the orientation directions of the crystalline polymer layers of the first surface substrate and the second surface substrate according to the present invention. In the present invention, the orientation direction refers to a direction (component) parallel to the surface of the substrate, and does not matter the thickness direction (component) of the substrate.
[0022]
The information recording medium 10 of the present invention shown in FIG. 1 mainly includes an amorphous thermosetting urethane polymer resin layer 11, a first surface substrate 1, an adhesive layer 8, a center core 7, an adhesive layer 8, The surface base material 2 and the amorphous thermosetting urethane polymer resin layer 12 are sequentially laminated.
[0023]
Next, each configuration will be described.
This example is a typical example of the information recording medium of the present invention, in which the first surface substrate 1 and the second surface substrate 2 have an amorphous thermosetting urethane polymer resin layer 11, 12 is formed.
The crystalline thermoplastic polymer resin of the first surface base material 1 and the second surface base material 2 imparts strength, toughness, and the like necessary for high durability of the information recording medium, and performs biaxial stretching treatment. The effect is further enhanced by the application. The amorphous thermosetting urethane polymer resin layers 11 and 12 formed on the surface of the base material are provided on the surface of the crystalline polymer base material subjected to the biaxial stretching treatment, such as durability, flexibility, and surface moldability. To give the information recording medium embossability, laser engraving printing suitability, and magnetic stripe 4 embedding suitability to the information recording medium.
[0024]
Here, if the thickness of the crystalline polymer base material subjected to the biaxial stretching treatment is large, the strength and heat resistance of the medium are increased, but on the other hand, the rigidity of the medium is increased and the rigidity is also increased. In other words, it lacks the desirable flexibility as an information recording medium and becomes hard. By providing the amorphous urethane polymer resin layers 11 and 12 on the tough crystalline polymer surface substrates 1 and 2 subjected to the biaxial stretching treatment as in the present invention, Flexibility, suitability for embossing, and suitability for embedding the magnetic stripe 4.
In addition, if the amorphous urethane polymer resin layer provided on the surface substrate is thermoset, durability such as chemical resistance and solvent resistance of the surface is enhanced.
[0025]
In the present invention, the provision of the amorphous urethane polymer resin layer does not necessarily have to be provided on both the surface substrate 1 and the surface substrate 2, and the layer structure provided on only one of them, that is, Alternatively, the layer structure may be such that only one of the amorphous thermosetting urethane polymer resin layers 11 and 12 is provided. However, when only one of the magnetic stripes is provided, for example, the magnetic stripe is provided on the side having the amorphous thermosetting urethane polymer resin layer. In order to make it excellent in terms of concealability, which conceals the presence of such that it is not easily recognized by the appearance or the like).
[0026]
In order to embed the magnetic stripe 4 or the like in the information recording medium according to the present invention so that no step is formed on the surface of the information recording medium, the amorphous thermosetting urethane polymer resin layers 11 and 12 are made thick. On the other hand, if the thickness of the amorphous thermosetting urethane polymer resin layers 11 and 12 increases, the flexibility of the information recording medium increases, but the strength and heat resistance temperature of the medium are weak. Tend to be. Therefore, the performance required for an information recording medium that seeks to achieve a balance between the thickness of the crystalline thermoplastic polymer base materials 1 and 2 and the thickness of the amorphous thermosetting urethane polymer resin layers 11 and 12. -It is important to design appropriately considering quality.
[0027]
The present invention relates to the thickness of the surface base materials 1 and 2 of the crystalline thermoplastic polymer resin and the thickness of the amorphous thermosetting urethane polymer resin layers 11 and 12 (here, the amorphous thermosetting urethane polymer). The resin layer may be provided only on one side as described above).
(A) The thickness of each of the surface substrates 1 and 2 of the crystalline thermoplastic polymer resin is 25 to 150 μm, and the thickness of the amorphous thermosetting urethane polymer resin layers 11 and 12 is 2 to 50 μm.
Preferably, (b) “the thickness (for one layer) of the surface base materials 1 and 2 of the crystalline thermoplastic polymer resin” is set to “the thickness of the amorphous thermosetting urethane polymer resin layers 11 and 12”. More than twice as much as
Set so that
Otherwise, the properties (strength, heat resistance, rigidity, hardness, etc.) of the information recording medium will be unsatisfactory in practical use. Here, the thickness of the amorphous thermosetting urethane polymer resin layer is relatively more important than the thickness of the surface substrate (1, 2) of the crystalline thermoplastic polymer resin. .
[0028]
In addition, from the viewpoint of preventing or reducing warpage or the like, generally, the surface base materials 1 and 2 of the crystalline thermoplastic polymer resin have the same (or appropriately equivalent) thickness. Is preferred. Also, the amorphous thermosetting urethane polymer resin layer also generally has the same thickness (or as appropriate, if provided on both sides, for the same reason as for the surface substrate). Equivalent).
(However, if the layer configuration is asymmetric or the arrangement of components is asymmetric in the thickness direction of the information recording medium, the information recording medium may be warped or deformed in some cases. In that case, as a measure against deformation, for example, the thickness of the surface base material or the thickness of the amorphous thermosetting urethane polymer resin layer may be appropriately selected within the above numerical range.)
[0029]
Since the thermal melting temperature of the crystalline thermoplastic polymer resin is high, the first surface base 1, the center core 7, and the second surface base 2 can be easily combined by heating and pressing. An adhesive layer 8 composed of an amorphous thermoplastic polymer resin layer having a low heat dissolution temperature is formed between the surface bases 1 and 2 of the polymer resin and the center core 7, and the first layer is formed by heating and pressing. Surface substrate 1, center core 7, and second surface substrate 2 can be easily laminated and integrated.
The heating temperature and pressure can be set appropriately depending on the material as long as they can be adhered.However, the amorphous thermoplastic polymer resin having a low heat melting temperature is formed on both sides of the crystalline thermoplastic polymer resin layer. When a layer is formed, it is generally preferable to appropriately select a temperature between 100 and 150 ° C. and a pressure between 500 and 1500 kPa.
[0030]
The procedure of forming the amorphous thermosetting urethane polymer resin layers 11 and 12 and integrating them by lamination include, for example,
(A) Amorphous thermosetting urethane polymer resin layers 11 and 12 are formed on each of or one of the base surfaces 1 and 2 of the crystalline thermoplastic polymer resin in advance to form a first surface. Integrating or the like by laminating the base material 1, the center core 7, and the second surface base material 2, or
(B) After the first surface substrate 1, the center core 7, and the second surface substrate 2 are once laminated and integrated, the first surface substrate 1 and the second surface substrate Forming amorphous thermosetting urethane polymer resin layers 11 and 12 on both or one surface of the surface base material 2;
Either may be used.
[0031]
PET (polyethylene terephthalate), PEN (polyethylene naphthalate) polyvinyl alcohol, polyolefin, polylactic acid, polyethylene vinyl alcohol, poly (PET) as the crystalline thermoplastic polymer resin of the first surface substrate 1 and the second surface substrate 2 Acrylonitrile, polypropylene and the like can be used.
However, it is generally more preferable to use PET in view of heat resistance, durability, cost, and processability of the information recording medium.
[0032]
In order to impart flexibility, embossability and embedding suitability of the magnetic stripe 4 to the surface substrates 1 and 2, for example, the amorphous thermoplastic polymer resin layers 11 and 12 The effect can be obtained by providing. However, on the other hand, there is a disadvantage that the surface durability, chemical resistance, heat resistance, and solvent resistance are weakened.
Therefore, it was considered that it is preferable to simply use a thermosetting resin as the amorphous polymer resin layer, but the thermosetting polymer resin is generally tough and has poor surface wettability. There are disadvantages, such as difficult to perform.
[0033]
In view of these, in the present invention, as the thermosetting resin which does not reduce the properties (advantages) such as surface flexibility and printability, particularly, a urethane resin formed by a crosslinking reaction between OH and NCO is used. Was found. That is, a polymer having an OH functional group at a terminal is added with a crosslinking agent of an isocyanate compound having two or more NCO functional groups to crosslink OH and NCO, thereby improving the durability of the polymer resin. It is to let.
According to this, if the crosslinking density between OH and NCO of the thermosetting urethane resin is too low, the resin becomes soft and the durability such as heat resistance decreases. On the other hand, if the crosslinking density is too high, the resin becomes hard and tough, and the surface wettability deteriorates. Therefore, in the present invention, the OH value relating to the crosslinking ratio is set to 1 to 20 mgKOH / g, whereby characteristics with good balance of toughness, flexibility, durability, surface wettability and the like are obtained.
[0034]
As the polymer having an OH functional group at the terminal used in the amorphous thermosetting urethane polymer resin layers 11 and 12, for example, a polyester polymer having an OH functional group at a terminal, polyester polyol, polyester urethane, polyurethane, Polyurethane polyol, acrylic polyol and the like can be used.
[0035]
In order to perform emboss printing on the surface of the medium, and to prevent cracking of the recording medium surface due to emboss printing, it is preferable to use a polymer that is easily stretched, has an elastic modulus of 500 to 2,500 MPa, and is easily formed. If the elastic modulus is too high, the resin has high rigidity and cannot follow the plastic deformation of the resin due to secondary processing such as embossing, which may cause cracks or lower the height of the plastic deformation emboss. However, when the elastic modulus is too low, the resin becomes soft, the surface of the medium is weak, and the medium is easily damaged.
Examples of the isocyanate compound having two or more NCO functional groups include TDI (toluene diisocyanate), MDI (limethylene diisocyanate), XDI, IPDI, and HDI. , IPDI, HDI and the like are preferably used.
Incidentally, additives such as organic pigments, inorganic pigments or organic dyes, inorganic dyes, stabilizers and surfactants can be added to these resins to modify the resins.
[0036]
In order to form the amorphous thermosetting urethane polymer resin layers 11 and 12 on the surfaces of the surface substrates 1 and 2 made of a crystalline thermoplastic polymer resin, the above-mentioned polymer having an OH functional group at the terminal is dissolved. A liquid and a mixture of a crosslinking agent of an isocyanate compound having two or more NCO functional groups are applied to the surface of the surface substrate 1 or 2, or are previously applied to the surface of another intermediate substrate, It can be formed by transferring to the surface base materials 1 and 2 described above.
As a method for applying the mixed liquid, for example, a gravure coater, a knife coater, a printing device, or the like can be used.
[0037]
In forming the amorphous thermosetting urethane polymer resin layers 11 and 12 on the substrate surface of the information recording medium, the first surface substrate 1, the center core 7, and the second surface substrate 2 Before lamination and integration, the amorphous thermosetting urethane polymer resin layers 11 and 12 are formed on the surface base materials 1 and 2 before lamination and integration, or lamination and integration beforehand. The method can be used to form on the surface of an information recording medium.
[0038]
By performing the biaxial stretching treatment of the crystalline thermoplastic polymer resin, the strength and durability of the surface substrate can be increased. However, since the biaxially stretched base material has anisotropy, the base material has different strength and thermodynamic properties in different directions.
The information recording medium formed by laminating and integrating the first surface substrate 1, the center core 7, and the second surface substrate 2 is composed of the first surface substrate 1 and the second surface substrate 2. If the orientation directions of the polymers do not match, the medium easily warps, twists, or curls.
Therefore, as shown in claims 2 and 10 of the present invention, the polymer orientation of the first surface substrate 1 and the polymer orientation of the second surface substrate 2 are as shown in FIG. It is important that the polymer alignment directions are aligned so that they are in the same direction, and integrated.
[0039]
Here, FIG. 2 shows a conceptual diagram of the molecular orientation of the base material. In the figure, circles and lines drawn on the upper and lower base materials indicate two base materials (crystalline thermoplastic polymer resin) to be superimposed. This indicates that the orientation directions of the base material 12 and the base material 22) are aligned in the same direction. The pattern of the molecular orientation can be determined by observing the change in the transmitted microwave intensity due to the anisotropy of the dielectric constant of the sample. For example, the pattern is examined using a molecular orientation meter [Oji Scientific Instruments, MOA-3000 series]. be able to.
[0040]
The surface base of a laminate obtained by laminating and integrating the amorphous thermosetting urethane polymer resin layers 11 and 12 according to the present invention with the first surface substrate 1, the center core 7, and the second surface substrate 2 When it is formed on the surface of a material, for example, the surface substrate is formed from a material that is arranged in the longitudinal direction (MD direction; longitudinal direction of web winding) of the material of the surface substrate in the form of a web-like film. 1 and the base material sheet of the surface base material 2 are taken, the longitudinal direction and the transverse direction (TD direction; width direction of the web) are aligned, and the center core 7 is laminated on the core side to be integrated.
A layer of an amorphous thermosetting urethane polymer resin according to the present invention is provided on both surface sides or one surface side of the laminate obtained in this manner.
[0041]
When processing the film of the surface base material used for each of the first surface base material 1 and the second surface base material 2, the surface base material is first slit to a certain width so that the orientation of the polymer is not mistaken. Then, the substrate sheets of the first surface substrate 1 and the second surface substrate 2 are taken from the slitted surface substrate sheet in the longitudinal direction (MD direction), in the longitudinal direction of the winding of the film. After stacking so that the longitudinal direction (MD direction) and the transverse direction (TD direction) of the stretching are aligned, the corners of the stacked surface base material sheet having a uniform polymer orientation are cut, or the edges of the sheet are formed. It is preferable to make a cut and mark it.
[0042]
Before laminating and integrating the first surface substrate 1, the center core 7, and the second surface substrate 2, the crystalline thermosetting urethane polymer resin layers 11 and 12 are preliminarily coated on the first surface substrate 1. When forming on the surface farther from each of the first and second surface base materials 2 or one of the center cores, the direction of the polymer orientation of the surface base materials 1 and 2 must be similarly aligned.
[0043]
For example, the amorphous thermosetting urethane polymer resin layer 11 is formed on the front surface of the film wound first in the longitudinal direction (MD direction), that is, in the front-rear direction of the film winding. Material 1
Then, an amorphous thermosetting urethane polymer resin layer 12 is formed on the back surface of the film that has been wound next, and is used as the surface substrate 2. When laminating and integrating, the surface substrate 1 is used as the upper surface of the information recording medium, the center core 7 and the lower surface as the surface substrate 2.
The non-crystalline thermosetting urethane polymer resin layers 11 and 12 of the surface base material 1 and the surface base material 2 are respectively provided on the outer surface of the medium, and the longitudinal direction (MD direction) of the polymer of the surface base material 1 and the surface base material 2 ) And the horizontal direction (TD direction).
[0044]
When the magnetic stripe 4 is formed on the surface of the amorphous thermosetting urethane polymer resin layers 11 and 12 to be used as an information recording medium with a magnetic stripe recording layer, the above-mentioned amorphous thermosetting urethane polymer resin layer is used in advance. Before laminating and integrating the surface base materials 1 and 2 on which the center cores 7 and 11 are formed, the magnetic stripes 4 are arranged on the amorphous thermosetting urethane polymer resin layers 11 and 12 and The substrates 1 and 2 and the center core 7 are laminated and integrated, and the magnetic stripe 4 is embedded in the surface of the substrate to make the surfaces flush. Alternatively, after the surface substrates 1 and 2 and the center core 7 are laminated and integrated, the magnetic stripe 4 is arranged on the amorphous thermosetting urethane polymer resin layers 11 and 12 and another heat and pressure integration is performed. Then, the magnetic stripe 4 is buried in the surface of the base material to make the surface flush. In this case, the amorphous thermosetting urethane polymer resin layers 11 and 12 may be formed on the surface base material in advance, or may be formed after the surface base material and the center core are laminated and integrated.
[0045]
The ID information and the pattern are provided on the entire surface or a part of the surface of the crystalline thermoplastic polymer resin base material 1 or 2 or the surface of the amorphous thermosetting urethane polymer resin layer 11 or 12 formed on the surface. A printed layer such as a design may be provided.
Further, in order to improve the adhesiveness between the surface base material and the printing layer, and between the amorphous thermosetting urethane polymer resin layers 11 and 12 and the printing layer, the surface of the surface base material or the amorphous thermosetting urethane high layer is used. The surface of the molecular resin layer may be subjected to an easy-adhesion treatment (for example, a corona discharge treatment, a plasma treatment, or a resin application).
[0046]
Further, on the surface of the amorphous thermosetting type urethane polymer resin layers 11 and 12 formed on the surface of the surface substrate 1 and the surface of the surface substrate 2 or the surface of the printing layer, another functional thin film layer, for example, The concealing layer, the protective layer, the visible recording layer, the hologram layer 5 and the like may be provided on the entire surface or a part thereof.
Further, as described above, when the magnetic stripes 4 are formed on the amorphous thermosetting urethane polymer resin layers 11 and 12, the magnetic stripes 4 are buried in the surfaces, and the magnetic stripes are flushed. A concealing layer 3 that conceals 4 may be provided.
Further, a magnetic recording layer, a magnetic stripe 4, a concealing layer 3, and a protective layer 6 may be formed, and the surface of the magnetic recording medium may be flushed by heating and pressing.
[0047]
The center core 7 is made of an amorphous thermoplastic polymer resin.
For example, polyvinyl chloride, polyvinyl acetate, polyvinyl butyral, polyvinylidene chloride, polyvinyl acetal, AS resin, polycarbonate, polymethyl methacrylate, polystyrene, ABS resin, polysulfone, celluloid, polyphenylene oxide, amorphous elastomer, PETG, etc. Amorphous solids such as composites, alloys, and blends of the above synthetic resins, natural resins, or modified resins of these resins alone or in combination can be used.
Furthermore, additives such as organic pigments, inorganic pigments or organic dyes, inorganic dyes, stabilizers, and surface active agents can be added to these resins to modify the resins.
[0048]
Further, the center core 7 may have a multilayer structure of the above-mentioned polymer resin as necessary.
For example, two center core layers or several center core layers may be integrated by heating and pressing in advance to be used as the center core 7, or the first surface substrate 1, the center core 7, and the second surface When the base materials 2 are integrated, they can be laminated and integrated together.
[0049]
Further, as described in claim 7 of the present invention, it is possible to embed a non-contact IC module 9 with an antenna in the center core 7.
For example, the non-contact IC module 9 with an antenna is arranged between the two layers with the center core 7 in two layers, and the IC module 9 is embedded in the center core 7 by performing thermal lamination.
[0050]
The IC module 9 includes an antenna coil for reception or transmission (here, “antenna coil” refers to an antenna having a coil shape in this specification), a memory for storing data, and, in some cases, for calculating data. And a battery (not shown) for supplying energy.
It is preferable that the IC module 9 be as thin as possible so as not to adversely affect the appearance, shape, and the like of the completed non-contact IC card (a typical example of the information recording medium according to the present invention).
Further, since the IC module 9 is easy to handle and the cost is low, a printed board type integrated module may be used.
[0051]
When the non-contact IC card recording medium is manufactured by a heating and pressurizing method with the IC module 9 interposed between two base materials, the heating temperature is increased to smooth the surface of the card recording medium, It is preferable to embed the IC module by flowing the base resin from above and below the IC module by pressure.
At that time, in order to reduce the pressure applied to the chip, it is preferable to apply pressure after heating the base resin.
Also, a hole of the same size as an electric component such as a chip mounted on the IC module 9 is formed on the base material of the center core, and the IC module 9 is set on the base material so that the electric component such as a chip is embedded in the hole. After that, it is preferable to perform heating and pressurization.
[0052]
Since the crystalline thermoplastic surface substrates 1 and 2 and the amorphous thermoplastic center core 7 can be easily laminated and integrated, the first thermoplastic resin can be used between the first surface substrate 1 and the center core 7, and An adhesive layer 8 is provided between each of the second surface substrate 2 and the center core 7. Further, depending on the application, a functional layer such as a printing layer or a hiding layer may be provided.
Further, depending on the specifications of the information recording medium, intermediate substrates can be provided between the first surface substrate 1 and the center core 7 and between the second surface substrate 2 and the center core 7, respectively.
An adhesive layer, a printing layer, and the like can also be provided on the surface of the intermediate substrate.
[0053]
As a method of laminating and integrating the information recording medium with the non-contact IC module 9, the first surface substrate 1, the substrate of the center core 7, the IC module 9, the substrate of the center core 7, the second surface substrate 2 is sequentially laminated and heated and pressurized once, and first, the base material of the center core 7, the IC module 9 and the base material of the center core 7 are sequentially laminated and firstly heated and pressed. To integrate the IC module 9 and the base material of the center core 7 first. Then, the first surface base material 1 and the second surface base material are placed on the upper and lower surfaces of the center core 7 in which the IC module 9 is embedded. There is a two-time system in which the materials 2 are laminated and subjected to secondary heating and pressing. In either method, the amorphous thermosetting urethane polymer resin layers 11 and 12 are formed beforehand on the surfaces of the surface base materials 1 and 2 or are formed after lamination and integration. .
[0054]
【Example】
Hereinafter, the present invention will be described with reference to specific examples.
<Example 1>
FIG. 1 is an explanatory view showing the configuration of an information recording medium 10 according to a first embodiment of the present invention in each step.
[0055]
A 100 μm-thick white biaxially stretched polyethylene terephthalate film is used as a surface substrate of a crystalline thermoplastic polymer resin, and an amorphous polyester urethane having an OH functional group at a terminal and HMDI (hexamethylene diisocyanate) having the following composition: The mixture was used as an amorphous thermosetting urethane polymer resin.
[0056]
<Composition>
100 parts of polyester urethane UR1400 (Toyobo KOH 2-3 mg / g)
TDI Takenate D202 (Takeda Pharmaceutical) 3parts
MEK 50 copies
60 parts of toluene
[0057]
First, the above mixed solution was applied to a surface of a white, biaxially stretched polyethylene terephthalate base material having a web width of 400 mm by a gravure coater so that the coating film had a thickness of 10 μm. A sheet having a thickness of 400 mm was taken, and the left side in the front direction was corner-cut to obtain a surface substrate 1 of the present invention.
Next, the above-mentioned mixed solution was applied to the back surface of a white biaxially stretched polyethylene terephthalate substrate having a width of 400 mm by a gravure coater so that the coating film had a thickness of 10 μm. One 400 mm sheet was taken, and the left side in the front direction was corner-cut to obtain a surface substrate 2 of the present invention.
[0058]
An integrated IC module with an etching antenna made of copper foil having a thickness of 18 μm is used as the IC module 9. The copper foil having a thickness of 18 μm is provided as a foil on a substrate. Here, a copper foil that has been patterned for an antenna by etching is used. Here, the thickness of the substrate is 120 μm, and the thickness of the IC chip component including the chip sealing material is 250 μm and the size is 2 × 2 mm.
[0059]
Amorphous polyester resin as a white base material having a size of 400 mm × 400 mm and a thickness of 280 μm; PETG [bending elastic modulus is 1,980 MPa, glass transition point (Tg) is 63 ° C.] As a base material used for the center core 7, the above-described IC module 9 is installed between the two base core material for the center core 7, and the laminate is set on a hot press machine, and the temperature is set to 145 ° C. Then, hot pressing was performed under the conditions of a pressure of about 1,000 kPa and integrated. Thus, the laminated body containing the IC module 9 was used as the center core 7 of the present invention.
Then, on the front and back surfaces of the center core 7, the surface base material 1 and the surface base material 2 are arranged such that the respective amorphous thermosetting urethane polymer resin layers 11 and 12 are outside, and 1 and the base material 2 were laminated so that the corner cut portions of the surface substrate 2 were aligned with each other so as to sandwich the center core.
[0060]
A magnetic stripe tape is provided on the surface of the laminated body thus laminated (the amorphous thermosetting urethane polymer resin layer 11 side) as if the magnetic stripe 4 is mounted on the surface by transfer. The laminated body was set on a hot press machine, and hot pressed under the conditions of a temperature of 135 ° C. and a pressure of about 1,000 kPa, and integrated.
Then, a laminated body having a thickness of 0.78 mm is obtained. At this time, the surface of the magnetic stripe 4 and the surface of the region of the substrate surface where there is no magnetic stripe (the amorphous thermosetting urethane polymer resin layer 11 side) And the outer surface was flat without any step due to the magnetic stripe.
[0061]
On the surface on the magnetic stripe 4 side of this laminate, a concealing layer 3 made of a commercially available silver ink was formed with a screen printing machine to a thickness of 2 μm, and a protective layer 6 made of a clear resin was formed. By applying heat and pressure, gloss was imparted to the surface, and thereafter, the card was cut into a card (so-called IC card) to obtain an information recording medium 10 according to the first embodiment.
[0062]
The surface of the obtained information recording medium 10 became smooth, and the magnetic stripe 4 was concealed. Further, a hologram transfer foil was transferred to the surface of the information recording medium to provide a hologram layer 5, and printing was performed by laser engraving to form laser engraved characters 6.
There was no problem in transferring the hologram, and no swelling of the character edge portion of the laser-engraved printing occurred.
When the heat resistance temperature of the information recording medium was evaluated, a high heat resistance temperature of 95 ° C. was obtained. In addition, the magnetic characteristics evaluated due to the provision of the magnetic stripe could sufficiently clear the JIS standard.
[0063]
【The invention's effect】
As described above, according to the present invention, the first surface substrate of the stretched crystalline thermoplastic polymer resin substrate, the center core, the stretched crystalline thermoplastic polymer In an information recording medium obtained by laminating and integrating a second surface base material of a resin base material, one or both surfaces of the first surface base material and the second surface base material are provided with an amorphous thermosetting urethane. By forming the molecular resin layer, it becomes possible to embed a magnetic stripe, perform laser engraving printing, and transfer a hologram transfer foil to the surface.
Further, by using the crystalline thermoplastic polymer resin base material subjected to the stretching treatment, the heat resistance of the information recording medium is increased, and the durability is improved.
[0064]
After all, according to the present invention, compared to the conventional technology, durability, heat resistance, chemical resistance, suitability for embossing (easiness of embossing, low curl, crack resistance), adhesion of printing ink (familiarity) Ease) or the suitability of laser printing can be improved to the same or better, especially the ease of embedding magnetic stripe tape and the outer surface of the information recording medium around the embedding. Is excellent in flatness (there is no step or the step is hardly noticeable), and it is hardly eroded by a solvent particularly when forming a concealing layer for concealing the magnetic stripe tape (durability to the solvent) And the concealing property of the concealing layer is hardly reduced), and it is possible to provide an information recording medium which satisfactorily conceals an embedded magnetic stripe, and a method for manufacturing the same, which satisfies these requirements.
[Brief description of the drawings]
FIG. 1 is a sectional view showing the configuration of an information recording medium according to a first embodiment of the present invention.
FIG. 2 is a conceptual diagram showing a method of aligning the orientation direction of a polymer substrate between a first surface substrate and a second surface substrate according to the present invention.
[Explanation of symbols]
1 ... first surface substrate
2 ... second surface substrate
3 ・・・ Hiding layer (printing layer)
4 ... magnetic stripe
5 ... hologram layer
6 ... protective layer
7 ・・・ Center core
8 ... adhesive layer
9 ... IC module
10 Information recording medium
11 ... Amorphous thermosetting urethane polymer resin layer
12 ... Amorphous thermosetting urethane polymer resin layer
39 ・・・ Orientation pattern measured by microwave polymer orientation meter

Claims

A first surface substrate which is a substrate using a thermoplastic polymer resin, a center core which is a substrate using a thermoplastic polymer resin, and a second surface substrate which uses a thermoplastic polymer resin An information recording medium laminated such that at least the order of the positions of the three base materials is relatively arranged in this order;
The first surface base material and the second surface base material are, respectively, a crystalline thermoplastic polymer resin base material that is a base material to which a crystalline thermoplastic polymer resin has been subjected to a biaxial stretching process. Used
For either one or both of these surface substrates, the surface farther from the center core is provided with an amorphous thermosetting urethane, which is a layer using a thermosetting polyurethane of an amorphous polymer resin. An information recording medium, wherein a molecular resin layer is formed.

The direction of the orientation of the crystalline thermoplastic polymer resin substrate of the first surface substrate and the direction of the orientation of the crystalline thermoplastic polymer resin substrate of the second surface substrate match. The information recording medium according to claim 1, wherein:

Both the first surface substrate and the second surface substrate, the crystalline thermoplastic polymer resin substrate is using biaxially stretched polyethylene terephthalate,
In addition, of the first surface substrate and the second surface substrate, the surface substrate on which the amorphous thermosetting polymer resin layer is formed has the crystalline thermoplastic polymer resin. 3. The information recording medium according to claim 1, wherein a thickness of the base material is larger than a thickness of the amorphous thermosetting polymer resin layer.

The amorphous thermosetting urethane polymer resin layer comprises a polymer having an OH functional group at a terminal and an isocyanate compound of a crosslinking agent having two or more NCO functional groups. 4. The information recording medium according to any one of 1 to 3.

2. The method according to claim 1, wherein at least a magnetic stripe is provided on the amorphous thermosetting urethane polymer resin layer, and a concealing layer is provided thereon so as to conceal the magnetic stripe. 5. The information recording medium according to any one of claims 4 to 4.

An adhesive layer is formed between the first surface substrate and the center core and between the center core and the second surface substrate. 5. The information recording medium according to any one of 5.

The center core has at least a non-contact IC module including an IC chip having a function for non-contact communication, and an antenna for performing non-contact communication in combination with the IC chip,
A structure in which all or a part of the non-contact IC module is sandwiched from both sides by an amorphous thermoplastic polymer resin layer which is at least an amorphous thermoplastic polymer resin layer. The information recording medium according to any one of claims 1 to 6, wherein

The information recording medium according to any one of claims 1 to 7, wherein the amorphous thermosetting urethane polymer resin layer is formed with a thickness of 2 to 50 µm.

A first surface substrate which is a substrate using a thermoplastic polymer resin, a center core which is a substrate using a thermoplastic polymer resin, and a second surface substrate which uses a thermoplastic polymer resin A method of manufacturing an information recording medium by laminating such that at least the order of the three base materials is relatively arranged in this order,
The first surface substrate and the second surface substrate, respectively, using a crystalline thermoplastic polymer resin substrate is a crystalline thermoplastic polymer resin biaxially stretched substrate,
For either one or both of these surface substrates, the surface farther from the center core is provided with an amorphous thermosetting urethane, which is a layer using a thermosetting polyurethane of an amorphous polymer resin. A method for producing an information recording medium, comprising a step of forming a molecular resin layer.

When laminating the at least three substrates, the orientation direction of the crystalline thermoplastic polymer resin substrate of the first surface substrate and the crystalline thermoplastic polymer resin group of the second surface substrate 10. The method for manufacturing an information recording medium according to claim 9, wherein a direction of orientation of the material is matched.

The step of forming the amorphous thermosetting urethane polymer resin layer uses a solution of a polymer having an OH functional group at a terminal and a crosslinking agent of an isocyanate compound having two or more NCO functional groups. A liquid mixture consisting of, directly applied to the surface substrate, or
The above-mentioned mixed solution is once applied to the surface of an intermediate base material which is a base material different from the base material, and after the amorphous thermosetting type urethane resin is formed in a layer in advance, the layered amorphous thermosetting Transferring the urethane resin to the surface substrate,
11. The method for manufacturing an information recording medium according to claim 9, wherein the amorphous thermosetting urethane polymer resin layer is formed by any one of these.

At least one of the first surface substrate, the center core, and the second surface substrate, and a polymer that exhibits adhesiveness by heating on a side facing another adjacent substrate. Providing an adhesive layer using resin,
12. The information recording medium according to claim 9, wherein the lamination is performed by a step of applying both heat and pressure in a state where at least the three base materials are overlapped. Method.

A first surface substrate which is a substrate using a thermoplastic polymer resin, a center core which is a substrate using a thermoplastic polymer resin, and a second surface substrate which uses a thermoplastic polymer resin A method of manufacturing an information recording medium by laminating such that at least the order of the three base materials is relatively arranged in this order,
The first surface substrate and the second surface substrate, respectively, using a crystalline thermoplastic polymer resin substrate is a crystalline thermoplastic polymer resin biaxially stretched substrate,
By arranging at least a magnetic stripe on the amorphous thermosetting urethane polymer resin layer and performing the lamination by applying both heat and pressure in a state where at least the three base materials are overlapped, To make the outermost surface flush,
Thereafter, at least on the surface on which the magnetic stripe is provided, providing a concealing layer for concealing the magnetic stripe,
The method for manufacturing an information recording medium according to claim 9, wherein: