Patent ID: 6964990

Claim:
An ethylene-vinyl alcohol copolymer resin composition, wherein the profile of its intrinsic viscosity [η] in heat treatment at 220° C. in a nitrogen atmosphere satisfies the following formulae (1) to (3), wherein said ethylene-vinyl alcohol copolymer resin composition contains from 0.2 to 15 μmol/g of a carboxylic acid (a2) having a molecular weight of smaller than 75, and from 2 to 25 μmol/g, in terms of the metal element, of an alkaline earth metal salt (B), and wherein a content M II of the alkaline earth metal salt (B) falls within a range that satisfies the following formulae (6) to (8): 0.05≦[η]0≦0.2 (1) 0.12≦[η]10/[η]0≦0.6 (2) 0.1≦[η]60/[η]0≦0.8 (3) X= 0.0257 ×E 2 −2.31 ×E +54.7 (6) Y= 0.0372 ×E 2 −2.43 ×E +47.7 (7) X≦M II ≦Y (8) wherein [η]0 indicates the intrinsic viscosity of the non-heated resin composition measured in l/g, [η]10 indicates the intrinsic viscosity of the non-heated resin composition heated for 10 hours measured in l/g, [η]60 indicates the intrinsic viscosity of the non-heated resin composition heated for 60 hours measured in l/g, E indicates the ethylene content in mol % of the ethylene-vinyl alcohol copolymer, and M II indicates the content of the alkaline earth metal salt (B) in μmol/g in terms of the metal element, in the resin composition.