편광막, 편광판 및 해당 편광막의 제조 방법

• Main Authors: SHIMAZU RYO, MORISAKI MAYUMI, GOTO SHUSAKU
• Format: Patent
• Language: Korean
• Published: 03.03.2022
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; 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

고온 고습 환경하에서의 내구성이 우수한 편광막이 제공된다. 본 발명의 편광막은, 요오드를 포함하는 폴리비닐알코올계 수지 필름으로 구성되고, 온도 60℃ 및 상대 습도 95%에서 240시간의 내구성 시험 후의 파장 600nm에서의 흡광도(Abs240)가, 내구성 시험 전의 흡광도(Abs0)에 대하여 이하의 관계를 만족한다. Abs240/Abs0>1.00 하나의 실시형태에서는, 편광막의 단체 투과율은 43.0% 이상이다. The present invention provides a polarizing film that has excellent durability in a high temperature, high humidity environment. A polarizing film according to the present invention is formed of a polyvinyl alcohol resin film containing iodine; and the absorbance Abs240 thereof at a wavelength of 600 nm after endurance test for 240 hours at a temperature of 60°C at a relative humidity of 95% satisfies the relational expression described below with respect to the absorbance Abs0 thereof before endurance test.　Abs240/Abs0 > 1.00 A polarizing film according to one embodiment of the present invention has a single transmittance of 43.0% or more.