POLYIMIDE FILM, LAMINATE, MEMBER FOR DISPLAY, TOUCH PANEL MEMBER, LIQUID CRYSTAL DISPLAY DEVICE, AND ORGANIC ELECTRONIC LUMINESCENT DISPLAY DEVICE

• Main Authors: YOSHINO REIJIRO, KOBAYASHI YOSHIHIRO, SAKAYORI KATSUYA, WAKITA KEISUKE, OKADA KODAI, MAEDA TAKANORI
• Format: Patent
• Language: English; Japanese
• Published: 18.10.2023
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

To provide a resin film that has excellent transparency, suitable for a display or a touch panel, and achieves improvements in both flexure resistance and surface hardness.SOLUTION: A film has anisotropy such that a ratio of tensile moduli in a tensile test with a X direction, which is one direction in a film plane, as a tensile direction and in a tensile test with a Y direction perpendicular to the X direction as the tensile direction is 1.50 or more, wherein the tensile moduli in the tensile directions are 1.8 GPa or more, respectively, the total light transmittance measured in accordance with JIS K7361-1 is 85% or more, and the yellowness calculated in accordance with JIS K7373-2006 is 5 or less. When used, the film is folded such that the folding part is perpendicular to the tensile direction in which, in a stress-strain curve obtained by a tensile test with the X direction of the film as the tensile direction and a tensile test with the Y direction of the film as the tensile direction, a strain at the yield point is 8% or more and the value of the strain at the yield point becomes larger.SELECTED DRAWING: None 【課題】ディスプレイやタッチパネル用の透明性に優れ、屈曲耐性と表面硬度の向上を両立した樹脂フィルムを提供する。【解決手段】フィルム面内の１方向であるＸ方向を引張方向とした引張試験と当該Ｘ方向に直交するＹ方向を引張方向とした引張試験における引張弾性率の比が１．５０以上となる異方性を有し、前記引張試験における引張弾性率がそれぞれ１．８ＧＰａ以上であり、ＪＩＳ Ｋ７３６１－１に準拠して測定する全光線透過率が、８５％以上であり、ＪＩＳ Ｋ７３７３－２００６に準拠して算出される黄色度が、５以下である、フィルムであって、当該フィルムのＸ方向を引張方向とした引張試験と当該フィルムのＹ方向を引張方向とした引張試験により得られる応力－ひずみ曲線のうち、降伏点におけるひずみが８％以上であり、且つ、降伏点におけるひずみの値がより大きくなる引張方向に対して、折り曲げ部が直交するように折り曲げて用いる、フィルム。【選択図】なし