JP7190411B2 - 複合伸縮性膜及びその形成方法 - Google Patents
複合伸縮性膜及びその形成方法 Download PDFInfo
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- JP7190411B2 JP7190411B2 JP2019169559A JP2019169559A JP7190411B2 JP 7190411 B2 JP7190411 B2 JP 7190411B2 JP 2019169559 A JP2019169559 A JP 2019169559A JP 2019169559 A JP2019169559 A JP 2019169559A JP 7190411 B2 JP7190411 B2 JP 7190411B2
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Description
下記一般式(2)で示されるポリエーテルとウレタン結合からなるcを含有するポリウレタン2からなる膜の上に、下記一般式(1)で示されるポリカーボネート又はポリエステルとウレタン結合を有する繰り返し単位a1、a2、a3、a4のうちの1つ以上と、シリコーンペンダント型ウレタン単位とb1、b2とが共重合されたポリウレタン1からなる膜が積層されていることを特徴とする。
本発明の伸縮性膜は、ポリカーボネート又はポリエステルとウレタン結合を有する単位a1~a4のうち1つ以上と、シリコーンペンダント型ウレタン単位b1及び/又はb2とが共重合されたポリウレタン1の硬化物からなる表面膜が、ポリエーテルとウレタン結合からなる単位cを有するポリウレタン2の硬化物からなる内部膜上に積層されてなるものである。高伸縮、高強度で伸縮時のヒステリシスが良好だが表面がベタつくポリエーテル型ポリウレタンをベースとする内部膜の表面に、低伸縮だが高強度、高撥水で表面がベタつかない側鎖シリコーンポリカーボネート及び/又はポリエステル型ポリウレタンからなる表面膜(層)を形成し、複合膜とすることによって、高伸縮、高強度、高撥水性、表面ベタ付き感が無く膜同士がくっつかない優れた伸縮性膜となる。
以下、表面膜と内部膜、各膜(層)を与えるポリウレタン1、2について説明する。なお、以下では、単位a1、a2、a3、a4をまとめて「単位a」若しくは「a単位」ともいう。
本発明の伸縮性膜の表面上(内部膜の上)には、表面膜が形成されている。表面膜(ポリカーボネート及び/又はポリエステルシリコーンペンダント型ポリウレタン層)は、下記一般式(1)中、a1~a4のうち1つ以上とb1及び/又はb2で示される構造を有するポリウレタン1の硬化物である。
ポリウレタン1は、一般式(1)中、a1~a4のうちの1つ以上とb1及び/又はb2で示される構造を有するポリウレタンであって、一般式(1)で示されるポリカーボネートやポリエステルとウレタン結合を有する単位a1~a4のうちの1つ以上と、シリコーンペンダント型ウレタン単位b1及び/又はb2とが共重合されたものである。ポリウレタン1は、上記構造を有するポリウレタンであればよく、その他の構造を含むことができる。
また、 繰り返し単位aは単位a1~a4の単独でも、任意の2つ以上の組み合わせであっても良く、単位a1(ポリカーボネート)と単位a2~a4(ポリエステル)を組み合わせても良い。ポリカーボネートのソフトセグメントとポリエステルのソフトセグメントを組み合わせることで得られる伸縮膜の伸縮性や強度を高めることができる。
本発明の内部膜は、一般式(2)で示されるポリエーテルとウレタン結合からなる単位cを有するポリウレタン2の硬化物からなる。
ポリウレタン2は、一般式(2)で示されるポリエーテルとウレタン結合からなる単位cを有するポリウレタンである。ポリウレタン2は、上記単位を有するポリウレタンであればよく、その他の構造を含むことができる。
式(2)中、R3、R4は同一又は非同一の炭素数2~12の直鎖状、分岐状のアルキレン基であり、上記R1、R2と同様の基を挙げることができる。R5は炭素数2~20の直鎖状、分岐状のアルキレン基又は芳香族基を含有する2価の連結基であり、エーテル基、チオール基、エステル基、スルフィニル基、スルホニル基、カルボニル基、ハロゲン原子を有していても良い。
上述のポリエーテル含有ポリウレタンは、それぞれポリエステルdを共重合しても良い。共重合可能なポリエステル部分を得るためのジオール化合物は下記に例示することが出来る。
本発明の複合伸縮性膜形成に用いられるポリウレタン1,2としては、重量平均分子量が500以上のものであることが好ましい。このようなものであれば、本発明の伸縮性膜に好適に用いることができる。また、樹脂の重量平均分子量の上限値としては、500,000以下が好ましい。
本発明の複合伸縮性膜の膜厚は、内部膜が1~1000μm、表面膜が0.1~100μmであることが好ましい。
内部膜に対して表面膜の方が薄い方が好ましく、表面膜/内部膜の膜厚の比が0.3~0.0001の範囲が好ましい。
また、本発明では、複合伸縮性膜を形成する方法であって、下記一般式(2)で示されるポリエーテルとウレタン結合からなる単位cを含有してなるポリウレタン2の硬化物からなる内部膜上に、下記一般式(1)で示されるポリカーボネート又はポリエステルとウレタン結合を有する繰り返し単位a1、a2、a3、a4のうちの1つ以上と、シリコーンペンダント型ウレタン単位b1及び/又はb2とが共重合されたポリウレタン1を塗布し、加熱及び/又は光照射によって硬化させることで表面膜を形成することを特徴とする複合伸縮性膜の形成方法を提供する。
本発明の複合伸縮性膜は、単独の自立膜として用いるだけでなく、繊維上やメンブレン膜上に形成することも出来る。
光ラジカル発生剤1:ジフェニル(2,4,6-トリメチルベンゾイル)ホスフィンオキシド
アルキル基やアリール基を有するモノマー:イソボロニルアクリレート
ポリエチレン基板上に、1層目伸縮性膜材料1-1~1-5をスリットコーターで塗布し、窒素雰囲気下1,000Wのキセノンランプで500mJ/cm2の光を照射して伸縮性膜の1層目を硬化させた。
硬化後の複合伸縮性膜(実施例1~14)、比較例の単独の伸縮性膜(比較例1~4)における膜厚、及び表面の水の接触角を測定し、指で触ったときのタック感を求めた。また、伸縮性膜表面の水の接触角を測定した後に、伸縮性膜を基板から剥がし、JIS K 6251に準じた方法で伸縮率と強度を測定した。結果を表2に示す。
前記方法にて硬化させた実施例1、比較例1~3のシートを13cm×15cmの大きさにカットし、島津製作所製引っ張り試験機(AGS-1X 1KN)を用いて0から20%の範囲で5%/分の速度で伸縮を行い、この時の応力を測定し、ヒステリシスカーブを求めた。ヒステリシスカーブを図8~11に示す。
5…粘着部、 6…複合伸縮性膜、 6-1…複合伸縮性膜1層目、
6-2…複合伸縮性膜2層目、 7…基板
Claims (6)
- 伸縮性膜であって、
下記一般式(1)で示されるポリカーボネート又はポリエステルとウレタン結合を有する単位a1、a2、a3、a4のうちの1つ以上と、シリコーンペンダント型ウレタン単位b1及び/又はb2とが共重合されたポリウレタン1の硬化物からなる表面膜が、下記一般式(2)で示されるポリエーテルとウレタン結合からなる単位cを有するポリウレタン2の硬化物からなる内部膜上に積層されてなるものであることを特徴とする複合伸縮性膜。
- 前記複合伸縮性膜が、JIS K 6251に規定される引っ張り試験で伸縮率が20~1000%の範囲のものであることを特徴とする請求項1又は請求項2に記載の複合伸縮性膜。
- 前記複合伸縮性膜が、伸縮性を有する導電性配線に接触する膜として用いられるものであることを特徴とする請求項1から請求項3のいずれか一項に記載の複合伸縮性膜。
- 複合伸縮性膜を形成する方法であって、
下記一般式(2)で示されるポリエーテルとウレタン結合からなる単位cを含有してなるポリウレタン2の硬化物からなる内部膜上に、下記一般式(1)で示されるポリカーボネート又はポリエステルとウレタン結合を有する繰り返し単位a1、a2、a3、a4のうちの1つ以上と、シリコーンペンダント型ウレタン単位b1及び/又はb2とが共重合されたポリウレタン1を塗布し、加熱及び/又は光照射によって硬化させることで表面膜を形成することを特徴とする複合伸縮性膜の形成方法。
- 前記ポリウレタン2を基板上に塗布し、加熱及び/又は光照射によって硬化させて前記内部膜とすることを特徴とする請求項5記載の複合伸縮性膜の形成方法。
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