公开(公告)号：US20250115035A1

公开(公告)日：2025-04-10

申请号：US18729444

申请日：2023-03-22

Applicant: TORAY ADVANCED MATERIALS KOREA INC.

Inventor： Kil Joong KIM ,  Sang Wook JUNG ,  Seong Yong PARK ,  Kyu Suk LEE

IPC: B32B27/18 ,  B29C48/00 ,  B29C48/08 ,  B29C48/21 ,  B29K67/00 ,  B32B7/02 ,  B32B27/08 ,  B32B27/36 ,  C08K5/49

Abstract: 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.