Method of producing thermoplastic resin

Abstract

A method of producing a thermoplastic resin includes obtaining ε-caprolactam by steps (a) and (b) using a waste (A) of a resin molded body containing at least polyamide 6 as a raw material, and polymerizing a raw material containing the ε-caprolactam: (a) adding at least one of water (B) heated to 290° C. or higher and 350° C. or lower and a polyamide 6 oligomer aqueous solution (B1) heated to 290° C. or higher and 350° C. or lower to the waste (A) of the resin molded body to make contact with each other; and (b) separating a reaction mixture obtained in step (a) into a solid and an aqueous solution containing ε-caprolactam by a solid-liquid separation (I).

Dependencies are inferred from the claim text.