POLARIZER PROTECTIVE FILM, POLARIZING PLATE, AND LIQUID CRYSTAL DISPLAY DEVICE

• Main Authors: FUJITA, Atsushi, MURATA, Kouichi, NAKASE, Katsuki, SASAKI, Yasushi
• Format: Patent
• Language: English; French; Japanese
• Published: 21.03.2019
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; 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; GENERAL PROCESSES OF COMPOUNDING; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; 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; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

The purpose of the present invention is to provide a polarizer protective film, a polarizing plate, and a liquid crystal display device which are capable of suppressing warpage of a liquid crystal panel. This polarizer protective polyester film is laminated on one surface of a polarizer, and satisfies conditions (1) and (2) below. (1) In a direction parallel to the transmission axis of the polarizer, the contractile force Ff of the polyester film is 800-9000 N/m, and (2) a ratio (Ff/Fv) of the contractile force Ff of the polyester film in the direction parallel to the transmission axis of the polarizer to the contractile force Fv of the polyester film in a direction parallel to the absorption axis of the polarizer is 2.5 to 12.0. L'objectif de la présente invention est de fournir un film de protection de polariseur, une plaque polarisante et un dispositif d'affichage à cristaux liquides qui sont aptes à supprimer le gauchissement d'un panneau à cristaux liquides. Un film de protection de polariseur en polyester est stratifié sur une surface d'un polariseur, et satisfait les conditions (1) et (2) ci-dessous. (1) Dans une direction parallèle à l'axe de transmission du polariseur, la force de contraction Ff du film de polyester comprise entre 800 et 9000 N/m, et (2) un rapport (Ff/Fv) de la force de contraction Ff du film de polyester dans la direction parallèle à l'axe de transmission du polariseur sur la force de contraction Fv du film de polyester dans une direction parallèle à l'axe d'absorption du polariseur est compris entre 2,5 et 12,0. 液晶パネルの反りを抑制することができる偏光子保護フィルム、偏光板及び液晶表示装置を提供することである。偏光子の一方の面に積層される偏光子保護用ポリエステルフィルムであって、以下の要件（１）及び（２）を満たす偏光子保護用ポリエステルフィルム。（１）偏光子の透過軸と平行な方向における、前記ポリエステルフィルムの収縮力Ｆｆが８００Ｎ／ｍ以上９０００Ｎ／ｍ以下である、（２）偏光子の透過軸と平行な方向における、前記ポリエステルフィルムの収縮力Ｆｆと偏光子の吸収軸と平行な方向における、前記ポリエステルフィルムの収縮力Ｆｖの比（Ｆｆ/Ｆｖ ）が２．５以上１２．０以下である。