公开(公告)号：US20240199779A1

公开(公告)日：2024-06-20

申请号：US18286245

申请日：2022-03-28

Applicant: KURARAY CO., LTD.

Inventor： Nobutaka HIRAOKA ,  Akio TAKASUGI ,  Takuro NIIMURA ,  Atsuhiro NAKAHARA ,  HiroakI SUGII ,  Yoshiaki ASANUMA

IPC: C08F216/06 ,  B32B17/10 ,  C08F2/06 ,  C08F216/38 ,  C08L29/04

CPC classification number: C08F216/06 ,  B32B17/10036 ,  B32B17/10788 ,  C08F2/06 ,  C08F216/38 ,  C08L29/04 ,  C08L2205/025

Abstract: The present invention relates to an acetalization product of an ethylene/vinyl alcohol copolymer, comprising: 20 to 80 mol % of an ethylene unit; and 4 to 76 mol % of a vinyl alcohol unit based on a total monomer unit constituting the acetalization product, wherein a degree of acetalization is 5 to 80 mol %, and expression (1): 0.75≤W0.05h/2f≤1.00 (1) [wherein W0.05h/2f represents a symmetry factor determined by reversed-phase partition gradient high-performance liquid chromatography analysis with a water-ethanol eluent, according to JIS K 0124:2011], and expression (2): 1.27≤Tm/Tg≤1.35 (2) [wherein Tm and Tg respectively represent a melting peak temperature (kelvin) and an intermediate glass transition temperature (kelvin) measured according to JIS K7121:2012] are satisfied.