| abstract |
The present invention provides an ethylene-vinyl alcohol copolymer, a resin composition, and a molded article thereof which are excellent in long-term use property of melt molding and which are capable of suppressing generation and coloring of film defects such as film defects or streaks, and having excellent appearance. The present invention relates to an ethylene-vinyl alcohol copolymer (A) obtained by saponifying a copolymer of ethylene and a vinyl ester, which is characterized by using colloidal permeation chromatography having a differential refractive index detector and an ultraviolet visible absorbance detector. The molecular weight measured after heat treatment at 220 ° C for 50 hours in a nitrogen atmosphere satisfies the conditions shown by the following formula (1).n(Ma-Mb)/Ma<0.45‧‧‧(1)nMa: Molecular weight converted from polymethyl methacrylate in the peak maximum measured by the differential refractive index detectornMb: Molecular weight converted from polymethyl methacrylate in the maximum value of the absorption peak at a wavelength of 220 nm measured by an ultraviolet-visible absorbance detector |