METHOD FOR PRODUCING OPTICAL FILM OPTICAL FILM POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY DEVICE

The objective of the present invention is to provide a manufacturing method of an optical film, which uses a vegetable-derived resin, has a small retardation value in the in-plane direction and the thickness direction, and suppresses display unevenness due to environmental fluctuations in a display...

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Bibliographische Detailangaben
Hauptverfasser:	TANAKA HIROFUMI, NANJIYOU TAKASHI, TAKEBE TAKASHI
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	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 LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PERFORMING OPERATIONS PHYSICS PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE 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
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Beschreibung
Zusammenfassung:	The objective of the present invention is to provide a manufacturing method of an optical film, which uses a vegetable-derived resin, has a small retardation value in the in-plane direction and the thickness direction, and suppresses display unevenness due to environmental fluctuations in a display device, an optical film, a polarizing plate and a liquid crystal display device. The method for manufacturing the optical film of the present invention includes a process of forming a long film with a dope containing a cellulose ester resin having a total degree of acetyl group substitution of 2.30 to 2.60 and a sugar ester having a furanose structure or a pyranose structure, and a process of stretching the long film, wherein the retardation value R_o is 0 to 10 nm, R_t is -10 to 10 nm, and the step of stretching the long film comprises a first process of obtaining a first stretched film, and a second process of further stretching the first stretched film to obtain a second stretched film in the order, and the stretching temperature of the second step is within the range of 190 to 220℃. [과제] 본 발명의 과제는, 식물성 유래의 수지를 사용하여, 면 내 방향 및 두께 방향의 리타데이션값이 작으며, 또한, 표시 장치의 환경 변동에 의한 표시 불균일을 억제한 광폭의 광학 필름의 제조 방법, 광학 필름, 편광판 및 액정 표시 장치를 제공하는 것이다. [해결 수단] 본 발명의 광학 필름의 제조 방법은, 총아세틸기 치환도가 2.30 ∼ 2.60 인 셀룰로오스에스테르 수지와, 푸라노오스 구조 혹은 피라노오스 구조를 갖는 당 에스테르를 함유하는 도프로 장척 필름을 형성하는 공정과, 상기 장척 필름을 연신하는 공정을 포함하고, 리타데이션값 Ro 가 0 ∼ 10 ㎚, Rt 가 -10 ∼ 10 ㎚ 이고, 상기 장척 필름을 연신하는 공정이, 제 1 연신 필름을 얻는 제 1 공정과, 당해 제 1 연신 필름을 추가로 연신하여, 제 2 연신 필름을 얻는 제 2 공정을 이 순으로 포함하며, 또한, 상기 제 2 공정의 연신 온도가 190 ∼ 220 ℃ 의 범위 내인 것을 특징으로 한다.