JP-2022528773-A5 -

Dates

Publication Date

20230509

Application Date

20200302

Description

According to the present invention, the PVA is selected from one or more combinations of isotactic PVA, syndiotactic PVA, and atactic PVA, for example, the syndiotacticity of the PVA is 15%-65%, specifically, for example, 40%-60% or 53%-55%. Preferably, it is atactic PVA, for example, PVA with a syndiotacticity of 45%-65%.