| abstract |
(57) [Summary] [PROBLEMS] To reduce the contamination of a treatment tank or piping at the time of water treatment of polyester chips, and to produce a molded product from polyester chips with transparency, heat resistance, mechanical properties, residual off-flavor, To provide a polyester with less off-flavor and excellent fragrance retention. SOLUTION: The acid component of the polyester is mainly an aromatic dicarboxylic acid, the free glycol content derived from the polyester is 30 ppm or less, the free aromatic dicarboxylic acid monoglycol ester content is 50 ppm or less, and the free aromatic Dicarboxylic acid diglycol ester content is 70 ppm or less, free dimer content of aromatic dicarboxylic acid and glycol is 200 ppm or less, Polyester having a fine content of 0.1 to 500 ppm and subjected to water treatment in the form of chips after polycondensation. |