Fully aromatic ether ketone resin composition, method of producing the same, molded article, and method of enhancing retention stability of melt viscosity of the resin composition

A method of producing a fully aromatic ether ketone resin composition comprising:

• adding at least, to (A) a fully aromatic ether ketone resin, at least one of (B) an acid and a base, and a salt composed of an acid and a base, and adjusting a pH thereof obtained by performing measurement by means of a pH measurement method below to be 6 to 8.
• [pH measurement method]
• (a) To 10 g of a powder of the fully aromatic ether ketone resin composition, 5 mL of acetone is added, then 100 mL of pure water is added thereto, a mixture is stirred for 10 minutes, and then the mixture is subjected to filtration.
• (b) 0.1 mL of pure water is added dropwise to a residue obtained by volatilizing a liquid component of a filtrate obtained in (a) above.
• (c) A temperature is set to 25° C., and the pH is measured by contacting a pH test paper with the pure water added dropwise to the residue in (b) above.

A method of enhancing a retention stability of a melt viscosity of a fully aromatic ether ketone resin composition containing (A) a fully aromatic ether ketone resin that is one or more selected from the group consisting of polyether ketone, polyether ether ketone, and polyether ketone ether ketone ketone, the method comprising:

• adding (B) a salt composed of an acid and a base to the fully aromatic ether ketone resin composition and adjusting a pH thereof obtained by performing measurement by means of a pH measurement method below to be 6 to 8.
• [pH measurement method]
• (a) To 10 g of a powder of the fully aromatic ether ketone resin composition, 5 mL of acetone is added, then 100 mL of pure water is added thereto, a mixture is stirred for 10 minutes, and then the mixture is subjected to filtration.
• (b) 0.1 mL of pure water is added dropwise to a residue obtained by volatilizing a liquid component of a filtrate obtained in (a) above.
• (c) A temperature is set to 25° C., and the pH is measured by contacting a pH test paper with the pure water added dropwise to the residue in (b) above.