| abstract |
The present invention provides an ethylene-vinyl alcohol copolymer, a resin composition, and a molded product thereof, which not only have excellent long-term runnability of melt molding, but also suppress the occurrence and coloring of film-forming defects such as film-forming defects and streaks, and which are excellent in appearance. The present invention provides an ethylene-vinyl alcohol copolymer (A) obtained by saponifying a copolymer of ethylene and vinyl ester, characterized by using a gel permeation chromatograph with 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 represented by the following formula (1). (Ma-Mb)/Ma<0.45...(1). Ma: molecular weight in terms of polymethyl methacrylate at the maximum value of the peak measured with a differential refractive index detector, Mb: maximum value of the absorption peak at a wavelength of 220 nm measured with an ultraviolet-visible absorbance detector The molecular weight in terms of polymethyl methacrylate conversion. |