公开(公告)号：US10252455B2

公开(公告)日：2019-04-09

申请号：US15419265

申请日：2017-01-30

Applicant: AGC Inc.

Inventor： Hiroshi Aruga ,  Tetsuya Hasegawa ,  Sho Masuda ,  Yoshiaki Higuchi

IPC: B29C47/00 ,  C08J5/18 ,  B29C43/46 ,  B29C47/88 ,  B29C43/24 ,  B29C43/00 ,  B29K27/12 ,  B29K105/00 ,  B29L7/00 ,  B29L31/00 ,  B29C47/14 ,  B29C47/40

Abstract: An ethylene/tetrafluoroethylene copolymer sheet obtained by extrusion, has R0/d, wherein R0 is an in-plane phase difference [unit: nm]and d is a thickness, [unit: nm], of at most 3.0×10−3, and a thickness of more than 300 μm. The ethylene/tetrafluoroethylene copolymer sheet preferably has a thickness of from 305 to 3,000 μm . A process for producing an ethylene/tetrafluoroethylene copolymer sheet includes melting an ethylene/tetrafluoroethylene copolymer to obtain a melt, continuously extruding the melt through a die for shaping the melt to a sheet, and letting the sheet pass between two rolls. One of the two rolls is a rigid roll, and the other is an elastic roll. The two rolls are pressed under a linear pressure of from 0.1 to 1,000 N/cm.