이축연신 폴리에스테르 수지계 필름 및 그 제조방법

• Main Authors: NAGANO HAZUMU, ARAKI GORO, ASHIHARA HIROSHI
• Format: Patent
• Language: Korean
• Published: 25.01.2023
• 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; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; 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

(과제) 본 발명은, 리사이클 원료를 사용하지 않은 이축연신 폴리에스테르 필름과 동등한 또는 그 이상의 우수한 물성, 특히 저온환경하에서의 우수한 내굴곡성을 갖는 이축연신 폴리에스테르 수지필름을 제공한다. (해결수단) 하기의 물성(1)∼(2) : (1) 시차주사열량측정(DSC)에 있어서, 25℃에서 300℃까지 승온속도 20℃/분으로 승온하고, 300℃에서 10분 유지시킨 후에, 강온속도 40℃/분으로 강온할 때에 결정화되는 온도가 160∼180℃인 것, (2) -10℃ 분위기하에서의 겔보 플렉스 테스터에 의한 200회의 반복굴곡피로시험 후에 있어서의 핀홀개수가 10개/500㎠ 이하인 것을 모두 만족하는 것을 특징으로 하는 이축연신 폴리에스테르 수지계 필름에 관한 것이다. [Problem] To provide a biaxially stretched polyester resin film that has excellent properties equal to or better than those of biaxially stretched polyester film that does not use recycled raw material, and in particular that has an excellent flexural resistance in low-temperature environments.[Solution] A biaxially stretched polyester resin film that characteristically satisfies both of the following properties (1) and (2): (1) in differential scanning calorimetry (DSC), after heating from 25°C to 300°C at a heating rate of 20°C/minute and holding for 10 minutes at 300°C, the temperature of crystallization during cooling at a cooling rate of 40°C/minute is 160°C to 180°C; and (2) the number of pinholes after the execution of 200 repetitive cycles of a flexural fatigue test in a -10°C atmosphere using a Gelbo Flex Tester is not more than 10/500 cm2.