MULTI-LAYERED FILM HAVING HIGH HARDNESS AND BENDABILITY

The present invention provides a multi-layered polyimide film which can be used as a cover window of a display by exhibiting excellent optical properties while exhibiting different mechanical properties and bending properties, such as high surface hardness and high bending properties. The present in...

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Bibliographische Detailangaben
Hauptverfasser:	KIM DONGYOUN, KIM WONKYUM, SHIM JAEHYUN
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING
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Beschreibung
Zusammenfassung:	The present invention provides a multi-layered polyimide film which can be used as a cover window of a display by exhibiting excellent optical properties while exhibiting different mechanical properties and bending properties, such as high surface hardness and high bending properties. The present invention relates to a multi-layered film of at least two layers including a first layer and a second layer, wherein the first layer has modulus of 5 GPa or more measured according to ASTM D882 and yield strain (Y/S) of less than 2.0 %, and the second layer has modulus of less than 5 GPa measured according to ASTM D882 and yield strain (Y/S) of 2.0 % or more. 본 발명은 우수한 광학 특성을 나타냄과 동시에 서로 상이한 기계적 물성과 벤딩 특성, 예컨대 높은 표면경도와 고굴곡 특성을 발휘하여, 디스플레이의 커버윈도우로 사용될 수 있는 다층 폴리이미드 필름을 제공한다.