Title:
ETHYLENE-VINYL ACETATE COPOLYMER, AND MOLDING, SHEET, AND FOAM COMPRISING THE SAME
Document Type and Number:
Japanese Patent JP2022136972
Kind Code:
A
Abstract:
To provide: an ethylene-vinyl acetate copolymer having excellent flexural moduli, thermostability, weatherability, and foaming uniformity; and a molding, sheet, and foam comprising the same.SOLUTION: An ethylene-vinyl acetate copolymer comprises 3.0 mass% or more and less than 11.0 mass% of a vinyl acetate unit, and an ethylene unit. When a free movement decay (M(t)) at 80°C measured by Solid Echo method of pulsed NMR is fitted by using the following formula 1 for three-components approximation, a compositional ratio of a component (α) with the lowest mobility is 28.0% or more and 36.0% or less and a relaxation time (Tγ) of a component (γ) with the highest mobility is 375 μs or more and less than 600 μs. Formula 1: (M(t))=α exp{(-1/1.5)(t/Tα)1.5}+β exp(-t/Tβ)+γ exp(-t/Tγ) [α: a compositional ratio (%) of a component (α) with the lowest mobility, Tα: a relaxation time (msec) of the component (α), β: a compositional ratio (%) of an intermediate mobile component (β), Tβ: a relaxation time (msec) of the component (β), γ: a compositional ratio (γ) of a component with the highest mobility, Tγ: a relaxation time (msec) of the component (γ), t: observation time (msec)].SELECTED DRAWING: None
Inventors:
SATO RIKU
NASU HIDEKI
KAKIHARA ICHIRO
NASU HIDEKI
KAKIHARA ICHIRO
Application Number:
JP2022006063A
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