Polyethylene terephthalate resins and process for producing polyester resin moldings

摘要

Provided in this invention are polyethylene terephthalate resins which can suppress the formation of acetaldehyde as a by-product in melt molding of the resins and can provide the molded products reduced in acetaldehyde content. A polyethylene terephthalate resin which has an intrinsic viscosity [eta₂] of not less than 0.70 dl/g and not more than 1.50 dl/g and an acetaldehyde content [AA₀ (ppm by weight)] of not more than 10 ppm by weight, and has such properties that the acetaldehyde content [AA₁ (ppm by weight)] of the molded product obtained by injection molding the resin at 280° C. with its moisture content adjusted to 30±20 ppm by weight and the acetaldehyde content [AA₂ (ppm by weight)] of the molded product obtained by injection molding the resin at 280° C. with its moisture content adjusted to 120±20 ppm by weight satisfy the following formula (1): [(AA₁-AA₂)/AA₁]x100>=30 (1)