METHOD OF MANUFACTURING RETARDATION FILM, RETARDATION FILM, DISPLAY PANEL USING THE SAME, AND IMAGE DISPLAY DEVICE

• Main Authors: KOBAYASHI YOSHIHIRO, OTA TAKAYUKI, SAKAYORI KATSUYA, WAKITA KEISUKE, OKADA KODAI, FURUSE AYAKO, KATSUMATA AYA, KANAZAWA NAHOMI, MAEDA TAKANORI, HOTTA HIKARI
• Format: Patent
• Language: English; Japanese
• Published: 02.04.2020
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

To provide a retardation film manufacturing method which allows for easily manufacturing a polyimide-based retardation film with a sufficiently small retardation value.SOLUTION: A retardation film manufacturing method provided herein comprises steps of: (1) applying a retardation layer-forming coating liquid, obtained by dissolving a polyimide with a glass transition temperature of 180-300°C in a solvent, to a base material and drying the same to form a coating film; and (2) heating the coating film to the polyimide glass transition temperature or higher.SELECTED DRAWING: None 【課題】位相差値が十分に小さいポリイミド系の位相差フィルムを簡易に製造することができる、位相差フィルムの製造方法を提供する。【解決手段】下記（１）〜（２）の工程を有する、位相差フィルムの製造方法。（１）基材上に、ガラス転移温度１８０〜３００℃のポリイミドを溶剤に溶解した位相差層形成用塗布液を塗布、乾燥して塗膜を形成する工程。（２）塗膜をポリイミドのガラス転移温度以上の温度で加熱する工程。【選択図】なし