POLYESTER MULTI-LAYER FILM AND MANUFACTURING METHOD THEREOF

• Main Authors: LEE KYU SUK, KIM KIL JOONG, JUNG SANG WOOK, PARK SEONG YONG
• Format: Patent
• Language: English; Korean
• Published: 05.10.2023
• 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; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; 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; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

본 발명의 폴리에스테르 다층 필름은 폴리에스테르를 포함하는 기재층 및 기재층의 적어도 일면에 위치하는 스킨층을 포함하며 필름 내의 환형 올리고머 농도와 열처리 전 후의 헤이즈 값을 소정의 상관관계를 만족시킴으로써, 고온 처리공정에서도 필름 내에서 올리고머 생성 및 표면으로의 마이그레이션을 억제하여 장기적으로 필름의 투명성 및 시인성을 유지하는 폴리에스테르 다층 필름을 제공한다. A polyester multi-layer film of the present invention comprises: a substrate layer comprising polyester; and a skin layer located on at least one surface of the substrate layer, wherein the polyester multi-layer film suppresses generation of oligomers in the film and migration to the surface even in a high-temperature treatment process by satisfying a predetermined correlation between the concentration of cyclic oligomers in the film and a haze value before and after heat treatment, thereby maintaining transparency and visibility of the film in the long term.