OPTICAL FILM, METHOD OF MANUFACTURING OPTICAL FILM, ROLL FILM, POLARIZING PLATE, AND IMAGE DISPLAY DEVICE

• Main Authors: KUREMATSU MASAYUKI, IWAMA SHOTA, TAKAGI TAKAHIRO, TASAKA MASAYUKI, OTA TOMOHISA
• Format: Patent
• Language: English; Japanese
• Published: 13.07.2017
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PERFORMING OPERATIONS; PHYSICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PROBLEM TO BE SOLVED: To provide an optical film that has a good shape when taken-up and has a low internal haze value.SOLUTION: An optical film of the present invention is a single-layer optical film in which both surfaces have different surface roughnesses Ra. When a surface with a larger surface roughness Ra of both surfaces is a surface A, and a surface with a smaller surface roughness Ra is a surface B, the difference between the coefficient of dynamic friction μ(A/A) measured when the optical films are overlapped with the surfaces A facing each other and the coefficient of dynamic friction μ(B/B) measured when the optical films are overlapped with the surfaces B facing each other satisfies 0.5≤μ(B/B)-μ(A/A)≤10.0.SELECTED DRAWING: None 【課題】本発明の課題は、巻き取られたときの形状が良好であって内部ヘイズ値が低い光学フィルムを提供することである。【解決手段】本発明の光学フィルムは、両面で表面粗さＲａの異なる単層の光学フィルムであって、両面のうち表面粗さＲａが大きい面をＡ面、表面粗さＲａが小さい面をＢ面としたとき、Ａ面同士を重ね合わせて測定したときの動摩擦係数μ（Ａ／Ａ）と、Ｂ面同士を重ね合わせて測定したときの動摩擦係数（Ｂ／Ｂ）との差が、０．５≦μ（Ｂ／Ｂ）−μ（Ａ／Ａ）≦１０．０を満たすことを特徴とする。【選択図】なし