JP7060630B2 - 可撓性プリント回路のための押出伸張性基材及びその製造方法 - Google Patents
可撓性プリント回路のための押出伸張性基材及びその製造方法 Download PDFInfo
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- JP7060630B2 JP7060630B2 JP2019569347A JP2019569347A JP7060630B2 JP 7060630 B2 JP7060630 B2 JP 7060630B2 JP 2019569347 A JP2019569347 A JP 2019569347A JP 2019569347 A JP2019569347 A JP 2019569347A JP 7060630 B2 JP7060630 B2 JP 7060630B2
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Description
従来から、剛性エレクトロニクスは、可撓性も伸長性もないユビキタスプリント回路基材(PCB)上に構築されている。可撓性エレクトロニクスは、典型的に、可撓性プリント回路(FPC)と呼ばれ、可撓性であるが伸長性のないポリイミド基材上にはんだ付けされている。一方、伸長性エレクトロニクスは、プリント構成要素及び/又は可撓性かつ伸長性である伸張性基材上の蛇行相互接続を使用した載置剛性構成要素である。ソフトロボット工学、エネルギー発生及びストレージデバイス、ウェアラブルセンサー、アンテナ、透明導電性電極、ならびに、伸長性バックプレーン、タッチセンサー及び相互接続を備えた折り畳み可能/曲げ可能なOLEDディスプレイなどの伸長性エレクトロニクスの潜在的な用途が登場している。
本発明の実施形態であるプリント回路のための基材として使用するのに適合した押出フィルム。この押出フィルムは、(a)98~100モル%の1,4-シクロヘキサンジカルボン酸の残基を有する二酸成分、(i)75~96モル%の1,4-シクロヘキサンジメタノールの残基及び(ii)4~25モル%の分子量500~1100のポリ(テトラメチレンエーテル)グリコールの残基を有するジオール成分、及び、前記二酸成分又はジオール成分のモル%に基づいて0.1~2モル%の、ヒドロキシル及びカルボキシルから選ばれる少なくとも3つの官能基を有する分岐剤を有するポリエステルエラストマー成分、及び、(b)98~100モル%の1,4-シクロヘキサンジカルボン酸の残基を有する二酸成分、及び、95~100モル%の1,4-シクロヘキサンジメタノールの残基を含むジオール成分を有する脂環式ポリマー成分を含む。脂環式化合物成分は、ポリ(1,4-シクロヘキシレンジメチレン-1,4-シクロヘキサンジカルボキシレート)であることができる。押出フィルムは、基材の表面上にプリントされた導電性インクを含むことができ、そして該フィルムは少なくとも一方向に配向されていることができる。
米国特許第7,297,755号明細書(参照によりその全体が本明細書に取り込まれる)によって教示されるように、ポリエステルエラストマー及び脂肪族ポリエステルをブレンドすることにより、広範囲の弾性率を有するポリマー基材を達成することができる。弾性率は、押出フィルムでは約200MPa~約900MPa、二軸配向フィルムでは約300MPa~約1.3GPaで変化することができる。基材の所望の弾性率が規定されている場合に、押出フィルム又は二軸配向フィルムのそれぞれの経験的モデルを使用して、目標の弾性率を達成することが可能である。二軸/一軸配向フィルムは、押出対応品に比べてダウンゲージング、アニーリング及び光学的利点を提供する。すべてのブレンドは高い可視光線透過率及び低いヘイズで混和性がある。その低屈折率は、低虹色ディスプレイ用のコーティング、接着剤及びガラスとよく一致する。伸び率の高い基材は、典型的に、繰り返し伸長性が要求されるウェアラブルデバイス、曲面ディスプレイ及び折り畳み性電子機器に適している。アニーリングされた基材により、導電性インクの高温硬化又は透明導電性コーティングのアニーリングが可能になる。
以下の実施例において、ポリマーブレンドはポリエステルエラストマー(A)と脂肪族ポリエステル(B)から構成されている。ポリマー(B)のブレンド比は0~100wt%の範囲にある。
(A)ポリエステルエラストマー組成物:100モル%のDMCD、0.5モル%のTMA、90.6モル%のCHDM、8.9モル%PTMEG。
(B)脂肪族ポリエステル組成物:100モル%のDMCD、100モル%CHDM。
ここで、
DMCD=1,4-シクロヘキサンジカルボン酸ジメチル、
TMA=無水トリメリット酸、
PTMEG=ポリ(テトラメチレンエーテル)グリコール、
CHDM=1,4-シクロヘキサンジメタノール。
サンプルは、(A)ポリエステルエラストマーと(B)脂肪族ポリエステルのブレンドから溶融加工により製造した。両方の材料を押出前に乾燥した。ブレンドは、2つの材料をペレット-ペレット混合することにより調製した(表1)。次いで、ブレンドをキャストフィルム押出ラインにフィードして、250μm厚のフィルムを製造した。表1に示すように、(A)ポリエステルエラストマーは押出中に容易に結晶化するので、各サンプルにはある程度の結晶化度がある。しかしながら、100%の(B)脂肪族ポリエステルは結晶化度がゼロである。
E=-0.0022x3+0.2481x2+3.3645x+205.12 (1)
(上式中、Eは引張弾性率MPaであり、xは脂肪族ポリエステルBのwt%である)
次いで、例1~8(例9~16に個々に対応する)サンプルを、ドイツのシーグスドルフのブリュクナーから入手可能なブリュクナー・カロIVフィルム延伸機で延伸して、機械方向及び横断方向に同時に延伸した二軸配向フィルムを製造した。表4は、Eastman Chemicalから入手可能なEcdel 9966ポリエステルエラストマー/Eastman Chemical Companyから入手可能なPCCD 19972脂肪族ポリエステルの様々なブレンド比の押出フィルムを、対応する延伸条件とともに示す。サンプルを熱風オーブンで70℃又は80℃で30秒間加熱し、歪み率100%で3x3(MDxTD)に延伸した。歪み率100%は、元の寸法が1秒で2倍になることを意味する。押出フィルムは公称厚さが10ミルなので、二軸配向フィルムは公称厚さが延伸後に1ミル強になる。Ecdel含有量の高いブレンドは、押出時に結晶化度%で20%半ばまで容易に結晶化する(表1)。二軸延伸は、さらなる結晶化を誘発しない(表4)。一方、押出PCCDシートは結晶化度がほとんどなく、その結晶化度は二軸延伸後に10%を超えるように増加する。
E=-0.0023x3+0.2287x2+10.073x+283.31 (2)
(上式中、Eは引張弾性率MPaであり、xは脂肪族ポリエステルBのwt%である)
E=-0.0039x3+0.3927x2+6.2758x+206.72 (3)
(上式中、Eは引張弾性率MPaであり、xは、B層の脂肪族ポリエステルの合計層厚%である)
ε=0.0034*ln(n)+0.0685 (4)
(上式中、εは永久歪みであり、nは20%伸び率でのサイクル数である)
ε=0.0074*ln(n)+0.1276 (5)
(上式中、εは永久歪みであり、nは40%伸び率でのサイクル数である)
ε=0.0053*ln(n)+0.0457 (6)
(上式中、εは永久歪みであり、nは20%伸び率でのサイクル数である)
ε=0.0114*ln(n)+0.0771 (7)
(上式中、εは永久歪みであり、nは40%伸び率でのサイクル数である)
例21は、2ミル(50ミクロン)の例9サンプルを、Creative Materials, Ayer, MAから入手可能なAg導電性インク、タイプ124-36を使用して、直線パターンでスクリーン印刷機でプリントしたものである。例22は、2ミル(50ミクロン)の例9のサンプルを、Ag導電性インクを使用して、正弦波パターンでスクリーン印刷したものである。比較例23は、4ミル(50ミクロン)の比較例20サンプルを、直線パターンでAg導電性インクを使用してライナースクリーン印刷したものである。比較例24は、4ミル(50ミクロン)の比較例20サンプルを、正弦波パターンでAg導電性インクを使用してライナースクリーン印刷したものである。フィルムサンプルの寸法は6cmx16cmであり、インクパターンはサンプルの1インチ×6インチの領域に集中している。プリントしたサンプルを、60℃の熱風オーブンで15分間硬化させた。インクは50℃~150℃で硬化できるが、温度が高いほど効果的である。比較の目的で、比較例23~24ではしわがすでに発生していたが、例21~22では歪みがなかったため、すべてのサンプルを60℃で硬化させた。
Claims (20)
- プリント回路のための基材としての使用に適合した多層フィルムであって、前記フィルムは、
(a)98~100モル%の1,4-シクロヘキサンジカルボン酸の残基を含む二酸成分、及び、
(i)75~96モル%の1,4-シクロヘキサンジメタノールの残基、及び、
(ii)4~25モル%の分子量500~1100のポリ(テトラメチレンエーテル)グリコールの残基を含むジオール成分、及び、
前記二酸成分又はジオール成分のモル%に基づいて0.1~2モル%の、ヒドロキシル及びカルボキシルから選ばれる少なくとも3つの官能基を有する分岐剤、
を含むポリエステルエラストマーを含む少なくとも1つの層、
(b)98~100モル%の1,4-シクロヘキサンジカルボン酸の残基を含む二酸成分、及び、95~100モル%の1,4-シクロヘキサンジメタノールの残基を含むジオール成分を含む、脂環式化合物を含む少なくとも1つの層、
を含む、多層フィルム。 - ポリエステルエラストマーを含む少なくとも1つの層と脂環式化合物を含む少なくとも1つの層との間に少なくとも1つの接着剤層を含む、請求項1記載の多層フィルム。
- 前記脂環式化合物成分はポリ(1,4-シクロヘキシレンジメチレン-1,4-シクロヘキサンジカルボキシレート)である、請求項1記載の多層フィルム。
- 前記基材の表面上にプリントされた導電性インクをさらに含む、請求項1記載の多層フィルム。
- ポリエステルエラストマー/脂環式化合物、ポリエステルエラストマー/脂環式化合物/ポリエステルエラストマー、又は、脂環式化合物/ポリエステルエラストマー/脂環式化合物を含む層構成を有する、請求項1記載の多層フィルム。
- 各層は少なくとも1つの方向に配向されている、請求項1記載の多層フィルム。
- 少なくとも1つのポリエステルエラストマー層及び少なくとも1つの脂環式化合物層を提供すること、及び、前記少なくとも1つのポリエステルエラストマー層を前記少なくとも1つの脂環式化合物層と接続させて多層フィルムを作成するための手段を提供しそして実行する、請求項1記載の多層フィルムの製造方法。
- 前記多層フィルムの少なくとも1つの層上に導電性インクをプリントすることをさらに含む、請求項7記載の方法。
- 前記少なくとも1つのポリエステルエラストマー層を前記少なくとも1つの脂環式化合物層と接続させて多層フィルムを作成するための手段は共押出プロセスを含む、請求項7記載の方法。
- 前記少なくとも1つのポリエステルエラストマー層を前記少なくとも1つの脂環式化合物層と接続して多層フィルムを作成するための手段はラミネート化プロセスを含む、請求項7記載の方法。
- 前記少なくとも1つのポリエステルエラストマー層を前記少なくとも1つの脂環式化合物層と接続させて多層フィルムを作成するための手段は押出コーティングプロセスを含む、請求項7記載の方法。
- (a)(i)98~100モル%の1,4-シクロヘキサンジカルボン酸の残基を含む二酸成分、及び、(i)75~96モル%の1,4-シクロヘキサンジメタノールの残基及び(ii)4~25モル%の分子量500~1100のポリ(テトラメチレンエーテル)グリコールの残基を含むジオール成分、及び、前記二酸成分又はジオール成分のモル%に基づいて0.1~2モル%の、ヒドロキシル及びカルボキシルから選ばれる少なくとも3つの官能基を有する分岐剤を含むポリエステルエラストマー成分を含む少なくとも1つのフィルム層、
(ii)98~100モル%の1,4-シクロヘキサンジカルボン酸の残基を含む二酸成分及び95~100モル%の1,4-シクロヘキサンジメタノールの残基を含むジオール成分を含む、脂環式化合物成分を含む少なくとも1つのフィルム層、及び、
(iii)基材の少なくとも1つのフィルム層の少なくとも1つの表面上にプリントされた導電性インク、
を含む、多層フィルムを含む基材を含む、伸長性プリント回路フィルム。 - 前記脂環式化合物成分はポリ(1,4-シクロヘキシレンジメチレン-1,4-シクロヘキサンジカルボキシレート)である、請求項12記載の伸長性プリント回路フィルム。
- 少なくとも1つのフィルム層は少なくとも1つの方向に配向されている、請求項12記載の伸長性プリント回路フィルム。
- 請求項12記載の伸長性プリント回路フィルムを含む製造品。
- ウェアラブルデバイス、曲面ディスプレイ、折り畳み性電子デバイス、インモールドエレクトロニクス、E-テキスタイル、伸長性薄膜トランジスタ又は透明導電膜を含む、請求項15記載の製造品。
- 前記基材は複数のミクロ層を含む、請求項12記載の伸長性プリント回路フィルム。
- ポリエステルエラストマー成分を含む少なくとも1つのフィルム層を提供すること、脂環式化合物成分を含む少なくとも1つのフィルム層を提供すること、前記ポリエステルエラストマー成分を含む少なくとも1つのフィルム層と、前記脂環式化合物成分を含む少なくとも1つのフィルム層とを接続するための手段を実行して多層フィルムを作成すること、前記基材の少なくとも1つのフィルム層の少なくとも1つの表面上に導電性インクをプリントすること、及び、前記少なくとも1つのフィルム層上の前記インクを硬化させることを含む、請求項12記載の伸長性プリント回路フィルムの製造方法。
- 前記伸長性プリント回路フィルムを製造品に取り込むことをさらに含む、請求項18記載の方法。
- 前記製造品は、ウェアラブルデバイス、曲面ディスプレイ、折り畳み性電子デバイス、インモールドエレクトロニクス、E-テキスタイル、伸長性薄膜トランジスタ又は透明導電膜を含む、請求項19記載の方法。
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