Manufacturing method of polyester

Abstract

A manufacturing method of polyester includes: a first recycled material, a second recycled material, ethylene glycol and a phosphorus-containing monomer are provided, in which the first recycled material includes polyethylene terephthalate (PET), and the second recycled material includes bis-2-hydroxylethyl terephthalate (BHET), polyethylene terephthalate dimer, polyethylene terephthalate trimer, mono(2-hydroxyethyl) terephthalic acid or combinations thereof; the first recycled material, the second recycled material, the ethylene glycol and the phosphorus-containing monomer are used to perform a depolymerization and monomer bonding step to obtain a polyethylene terephthalate containing phosphorus monomer oligomer; a catalyst is provided; and the polyethylene terephthalate containing phosphorus monomer oligomer and the catalyst are used to perform a copolymerization step.

Dependencies are inferred from the claim text.