| 摘要 |
A polyester resin which is excellent in the color tone and the transparency, which has a low acetaldehyde content, and further, which is excellent also in the thermal stability and of which the increase in the acetaldehyde content during e.g. the melt molding is reduced, is provided. <??>A polyester resin produced by polycondensing a dicarboxylic acid component containing terephthalic acid as the main component and a diol component containing ethylene glycol as the main component in the presence of (1) a compound of at least one element selected from the group consisting of titanium group elements of Group 4A of the periodic table, (2) a magnesium compound and (3) a phosphorus compound, via an esterification reaction, characterized in that the contents as atoms derived from the respective compounds (1), (2) and (3) satisfy the following formulae (I) to (V), where the total amount of titanium group atoms of the compound (1) is T (mol/ton resin), the total amount of magnesium atoms of the compound (2) is M (mol/ton resin) and the total amount of phosphorus atoms of the compound (3) is P (mol/ton resin): <DF>(I) 0.020</=T</=0.200 </DF> <DF>(II) 0.040</=M</=0.400 </DF> <DF>(III) 0.020</=P</=0.300 </DF> <DF>(IV) 0.50</=M/P</=3.00 </DF> <DF>(V) 0.20</=M/T</=4.00 </DF>
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