公开(公告)号：US20200283625A1

公开(公告)日：2020-09-10

申请号：US16496823

申请日：2018-03-26

Applicant: I.S.T CORPORATION

Inventor： Yuki SHIRAI ,  Koji MORIUCHI

IPC: C08L79/08 ,  C08G73/10 ,  C08J5/18

Abstract: The present invention provides a colorless and transparent polyimide film which exhibits excellent heat resistance, transparency and strength equivalent to those of the conventional colorless and transparent polyimide film, can be produced at a lower cost than the conventional polyimide film, and is more resistant to methyl ethyl ketone than the conventional polyimide film. The colorless and transparent polyimide film of the present invention is made from a specific polyimide resin. The specific polyimide resins comprise a site derived from BPDA, at least one site selected from the group comprising a site derived from BPADA and a site derived from ODPA, a site derived from TFMB, and at least one site selected from the group comprising a site derived from 3,3′-DDS and a site derived from 4,4′-DDS. The haze value of the polyimide film is in the range of 0.1 or more and 2.0 or less.