다공성 폴리올레핀 필름, 전지용 세퍼레이터 및 이차전지

• Main Authors: NAKASHIMA RYOTA, TANAKA HIROKO, TOYOTA NAOKI, ISHIHARA TAKESHI, KUMA TAKUYA
• Format: Patent
• Language: Korean
• Published: 12.07.2021
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

본 발명은, 주파수 1Hz, 승온 속도 5℃/분, 변형 속도 0.1%/초로 측정한 동적 점탄성의 tanδ의 피크 온도가, MD 방향(기계 방향) 및 TD 방향(폭 방향) 중 적어도 1방향에서 105℃ 이상인 다공성 폴리올레핀 필름에 관한 것이다. 본 발명의 다공성 폴리올레핀 필름은, 박막화해도 이물에 의한 단락이 발생하기 어렵고, 고온이나 높은 텐션에 대한 형태 안정성에도 뛰어나다. The present invention relates to a porous polyolefin film in which the peak temperature of tan δ of the dynamic viscoelasticity thereof measured at a frequency of 1 Hz, a temperature increase rate of 5°C/minute, and a strain rate of 0.1%/second is 105°C or greater in at least one of the MD direction (machine direction) and the TD direction (transverse direction). This porous polyolefin film is not prone to short circuiting due to foreign matter even when reduced in thickness, and also has excellent shape stability against high temperature or high tension.