Title:
ETHYLENE-VINYL ACETATE COPOLYMER, AND MOLDING, SHEET, AND FOAM COMPRISING THE SAME
Document Type and Number:
Japanese Patent JP2022136973
Kind Code:
A
Abstract:
To provide an ethylene-vinyl acetate copolymer having excellent impact strength, environmental stress cracking resistance, releasability, and transparency, and a molding, a sheet, and a foam comprising the same.SOLUTION: An ethylene-vinyl acetate copolymer contains a vinyl acetate unit of 11 mass% or more and 25 mass% or less and an ethylene unit. By GPC-FTIR, a molecular weight distribution, as well as a methylene group-attributable absorbance I(-CH2-), a carbonyl group-attributable absorbance I(-C=O), and a methyl group-attributable I(-CH3) for each molecular weight are measured, so that a gradient P of the least-squares method approximate linear relational expression of an absorbance ratio (Ii(-C=O)/Ii(-CH2-)) to a logarithm log(Mi) of each molecular weight Mi in a half-width region of the molecular weight distribution is 0.00≤P≤1.40, and an average value Q of an absorbance ratio (Ii(-CH3)/Ii(-CH2-)) of each molecular weight Mi in the half-width region of the molecular weight distribution is 23.0≤Q≤30.0.SELECTED DRAWING: None
Inventors:
NASU HIDEKI
SATO RIKU
KAKIHARA ICHIRO
SATO RIKU
KAKIHARA ICHIRO
Application Number:
JP2022006078A
Publication Date:
September 21, 2022
Filing Date:
January 19, 2022
Export Citation:
Assignee:
ASAHI KASEI CORP
International Classes:
C08F218/08
Attorney, Agent or Firm:
Yoshiyuki Inaba
Toshifumi Onuki
Akihiko Eguchi
Kazuhiko Naito
Toshifumi Onuki
Akihiko Eguchi
Kazuhiko Naito