POLYCONDENSATION RESIN AND OPTICAL FILM COMPRISING SAME

• Main Authors: UEHARA HISATOSHI, TAKAMI YOSHIE, HIRAMI YUUICHI, NOGAMI HIROYUKI, NAMIKI SHINGO, HAYASHI HIROYUKI
• Format: Patent
• Language: English; Korean
• Published: 23.02.2021
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; 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; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

본 발명은, 광학 물성, 내열성, 기계 물성, 열 안정성 등의 여러 가지 특성이 균형있게 우수한 수지, 그리고 그것을 사용하여 얻어지는 광학 필름 및 위상차 필름을 제공하는 것을 목적으로 한다. 본 발명은, 방향족 구조를 포함하는 반복 구조 단위를 갖는 중축합계의 수지로서, 그 반복 구조 단위 중의 방향족 구조의 함유량이 하기 식 (I) 을 만족하고, 구조 단위를 갖는 것을 특징으로 하는 수지에 관한 것이다. 5 ≤ A ≤ －22.5 × B ＋ 38.3 (I) 단, 0.75 ≤ B ≤ 0.93 A：수지를 구성하는 반복 구조 단위 중의 방향족 구조의 함유량 [질량％] B：수지로부터 제조된 연신 필름의, 450 ㎚ 에 있어서의 위상차 (R450) 와 550 ㎚ 에 있어서의 위상차 (R550) 의 비 (R450/R550) The purpose of the present invention is to provide a resin that has an excellent balance of a variety of properties, such as optical physical properties, heat resistance, mechanical properties, and heat stability, and to provide an optical film and a phase-difference film that are obtained using the resin. The present invention relates to a polycondensation resin that has a repeating structural unit that includes an aromatic structure, the resin being characterized by having a structural unit and by the content of the aromatic structure in the repeating structural unit satisfying formula (I). (I) 5≤A≤-22.5∙B+38.3, wherein 0.75≤B≤0.93, A is the content (in mass%) of the aromatic structure in the repeating structural unit that constitutes the resin, and B is the ratio (R450/R550) of the phase difference (R450) at 450 nm and the phase difference (R550) at 550 nm of a stretched film that is produced from the resin.