Melt-molded article containing an ethylene-vinyl alcohol copolymer resin composition of low carboxylic acid content

A method for producing a film comprising:

• melt molding an ethylene-vinyl alcohol copolymer resin composition,
• wherein the ethylene-vinyl alcohol copolymer resin composition is obtained by contacting an ethylene-vinyl alcohol copolymer resin with an aqueous solution comprising carbon dioxide gas, a phosphoric acid compound and at least one additive selected from the group consisting of an alkali metal salt (A) and a boron compound (B);
• drying the phosphoric acid compound-containing ethylene-vinyl alcohol resin to obtain a dried phosphoric acid compound-containing ethylene-vinyl alcohol resin;
• and
• heating the dried phosphoric acid compound-containing ethylene-vinyl alcohol resin in a molten state;
• wherein
• a ratio (d/t) of the content (d:
• μmol/g) of the phosphoric acid compound (D) in terms of phosphate radical to a content (t:
• μmol/g) of phosphorus element in the ethylene-vinyl alcohol copolymer resin composition is 0.4 or less in the ethylene-vinyl alcohol resin, and
• wherein
• the content (d) of the phosphoric acid compound (D) is determined by ion chromatography analysis of a solution obtained by extraction of the melt-molded article with 0.01 N aqueous HCL solution at 95° C. for 4 hours, and
• the content (t) of phosphorous element is determined by high-frequency plasma emission spectrochemical analysis of a solution of combustion ash, the combustion ash being obtained by complete burning of the melt-molded article by an oxygen-flask combustion technique.

A method for producing a multilayer structure comprising:

• laminating an ethylene-vinyl alcohol copolymer resin composition with a thermoplastic resin,
• wherein the ethylene-vinyl alcohol copolymer resin composition is obtained by contacting an ethylene-vinyl alcohol copolymer resin with an aqueous solution comprising carbon dioxide gas, a phosphoric acid compound and at least one additive selected from the group consisting of an alkali metal salt (A) and a boron compound (B);
• drying the phosphoric acid compound containing ethylene-vinyl alcohol resin to obtain a dried phosphoric acid compound containing ethylene-vinyl alcohol resin;
• and
• heating the molten dried phosphoric acid compound containing ethylene-vinyl alcohol resin in a molten state;
• wherein
• a ratio (d/t) of the content (d:
• μmol/g) of the phosphoric acid compound (D) in terms of phosphate radical to a content (t:
• μmol/g) of phosphorus element in the ethylene-vinyl alcohol copolymer resin composition is 0.4 or less in the ethylene-vinyl alcohol resin, and
• wherein
• the content (d) of the phosphoric acid compound (D) is determined by ion chromatography analysis of a solution obtained by extraction of the melt-molded article with 0.01 N aqueous HCL solution at 95° C. for 4 hours, and
• the content (t) of phosphorous element is determined by high-frequency plasma emission spectrochemical analysis of a solution of combustion ash, the combustion ash being obtained by complete burning of the melt-molded article by an oxygen-flask combustion technique.

A film comprising an ethylene-vinyl alcohol copolymer resin composition, wherein the ethylene-vinyl alcohol copolymer resin composition comprises:

• an ethylene-vinyl alcohol copolymer;
• a phosphoric acid compound (D);
• and
• phosphorous element;
• wherein
• a ratio (d/t) of the content (d:
• μmol/g) of the phosphoric acid compound (D) in terms of phosphate radical to the content (t:
• μmol/g) of the phosphorus element is 0.4 or less, and
• wherein
• the content (d) of the phosphoric acid compound (D) is determined by ion chromatography analysis of a solution obtained by extraction of the melt-molded article with 0.01 N aqueous HCL solution at 95° C. for 4 hours, and
• the content (t) of phosphorous element is determined by high-frequency plasma emission spectrochemical analysis of a solution of combustion ash, the combustion ash being obtained by complete burning of the melt-molded article by an oxygen-flask combustion technique.

A multilayer structure comprising

• at least one layer comprising an ethylene-vinyl alcohol copolymer resin composition, the resin composition comprising:
• an ethylene-vinyl alcohol copolymer resin,
• a phosphoric acid compound (D) and
• phosphorous element,
• wherein a ratio (d/t) of the content (d:
• μmol/g) of the phosphoric acid compound (D) in terms of phosphate radical to the content (t:
• μmol/g) of phosphorous element is 0.4 or less, and
• wherein
• the content (d) of the phosphoric acid compound (D) is determined by ion chromatography analysis of a solution obtained by extraction of the melt-molded article with 0.01 N aqueous HCL solution at 95° C. for 4 hours, and
• the content (t) of phosphorous element is determined by high-frequency plasma emission spectrochemical analysis of a solution of combustion ash, the combustion ash being obtained by complete burning of the melt-molded article by an oxygen-flask combustion technique.