OPTICAL FILM, POLARIZER AND IMAGE DISPLAY DEVICE

• Main Authors: OGAWA YOSHIMASA, OYARI YOSHIAKI, IWASAKI TOSHIKI, SATO JUN
• Format: Patent
• Language: English; Japanese
• Published: 28.02.2024
• Subjects: ADVERTISING; CALCULATING; COMPUTING; COUNTING; CRYPTOGRAPHY; DISPLAY; DISPLAYING; EDUCATION; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; LABELS OR NAME-PLATES; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PERFORMING OPERATIONS; PHYSICS; SEALS; SIGNS; TRANSPORTING

To provide an optical film, in which superior scratch resistance and superior abrasion resistance can be realized and superior antifouling property can be realized, as well as a polarizer and an image display device comprising the same.SOLUTION: An optical film 10 comprises: a resin base material 11; and a functional layer 12 that is provided on a first surface 11A side of the resin base material 11, a surface 10A of the optical film 10 being a surface 12A of the functional layer 12, the number of specific depressed areas in an area of being 5 μm square on the surface 10A of the optical film 10 after performing an eraser test in which the surface 10A of the optical film 10 is scraped 4000 times back and forth with weight 500 g using an eraser being more than or equal to one and less than or equal to 50, a dynamic friction coefficient of the surface 10A of the optical film 10 before the eraser test being less than or equal to 0.70, and a change rate of the dynamic friction coefficient of the surface 10 of the optical film 10 after the eraser test relative to the dynamic friction coefficient of the surface 10A of the optical film 10 before the eraser test being 35%. The optical film 10 is provided.SELECTED DRAWING: Figure 1 【課題】優れた耐擦傷性および優れた耐摩耗性を実現でき、かつ優れた防汚性を実現できる光学フィルムならびにこれを備えた偏光板および画像表示装置を提供する。【解決手段】樹脂基材１１と、樹脂基材１１の第１の面１１Ａ側に設けられた機能層１２とを備える光学フィルム１０であって、光学フィルム１０の表面１０Ａが、機能層１２の表面１２Ａであり、消しゴムを用いて荷重５００ｇで光学フィルム１０の表面１０Ａを４０００往復擦る消しゴム試験を行った後の光学フィルム１０の表面１０Ａの５μｍ角の領域における特定の窪みが１個以上５０個以下存在し、消しゴム試験前の光学フィルム１０の表面１０Ａの動摩擦係数が、０．７０以下であり、消しゴム試験前の光学フィルム１０の表面１０Ａの動摩擦係数に対する消しゴム試験後の光学フィルム１０の表面１０の動摩擦係数の変化率が、３５％である、光学フィルム１０が提供される。【選択図】図１